EP2126445A1 - Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation - Google Patents

Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation

Info

Publication number
EP2126445A1
EP2126445A1 EP07848107A EP07848107A EP2126445A1 EP 2126445 A1 EP2126445 A1 EP 2126445A1 EP 07848107 A EP07848107 A EP 07848107A EP 07848107 A EP07848107 A EP 07848107A EP 2126445 A1 EP2126445 A1 EP 2126445A1
Authority
EP
European Patent Office
Prior art keywords
measuring tube
measuring
medium
adapter
tube
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Withdrawn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
EP07848107A
Other languages
German (de)
English (en)
Inventor
Arno Lang
Jörg Roth
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 EP2126445A1 publication Critical patent/EP2126445A1/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Withdrawn legal-status Critical Current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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/08—Joints with sleeve or socket with additional locking means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/18—Supports or connecting means for meters
    • G01F15/185—Connecting means, e.g. bypass conduits

Definitions

  • the invention relates to a device for measuring the volume or mass flow of a medium in a pipeline, with a measuring tube, which is flowed through by the medium in the direction of the longitudinal axis of the measuring tube, with a magnet system, which passes through the measuring tube, essentially generates magnetic field extending transversely to the longitudinal axis of the measuring tube, with two measuring electrodes coupling to the medium, which are arranged in a region of the measuring tube lying substantially perpendicular to the magnetic field, and with a control / evaluation unit which, based on the measuring voltage induced in the measuring electrodes, transmits information about provides the volume or mass flow of the medium in the measuring tube.
  • the invention relates to a measuring tube, which can be used in conjunction with an arbitrarily designed flow meter.
  • the flowmeter is, for example, a Coriolis or a thermal flowmeter, a magnetic-inductive, a vortex or a sonic or ultrasonic flowmeter.
  • the invention will be described below preferably in conjunction with a magnetic-inductive flowmeter.
  • the measuring tube designed according to the invention can in principle be used in conjunction with all known types of flowmeters.
  • Magnetic-inductive flowmeters make use of the principle of electrodynamic induction for volumetric flow measurement: charge carriers of the medium which are perpendicular to a magnetic field induce a measuring voltage in measuring electrodes which are also substantially perpendicular to the flow direction of the medium and perpendicular to the direction of the magnetic field.
  • the measuring voltage induced in the measuring electrodes is proportional to the average 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 in the pipeline or in the measuring tube can be determine.
  • the measuring voltage is usually tapped via a pair of measuring electrodes, which is preferably arranged in the region of the maximum magnetic field strength, ie where the maximum measuring voltage is to be expected.
  • the measuring electrodes are usually galvanically coupled to the medium; However, magnetic-inductive flowmeters with capacitively coupling measuring electrodes have also become known.
  • the measuring tube may be made of either an electrically conductive material, e.g. Stainless steel, be made, or it is made of an electrically insulating material. If the measuring tube is made of an electrically conductive material, then it must be lined in the region in contact with the medium with a liner made of a non-conductive material.
  • the liner usually consists of a thermoplastic, a thermosetting or an elastomeric plastic.
  • magnetic-inductive flow meters with a ceramic lining have also become known.
  • the measuring electrodes are in addition to the magnetic system, the essential
  • measuring electrodes Components of a magnetic-inductive flowmeter.
  • care must be taken that they can be mounted as simply as possible in the measuring tube and that no leakage problems subsequently occur during measuring operation;
  • the measuring electrodes should be distinguished by a sensitive and at the same time low-interference measurement signal acquisition.
  • pin electrodes that can be mounted from the outside of the measuring tube, or measuring electrodes with a widened electrode head, which are mounted from the inside of the measuring tube.
  • a flow meter has become known in which the measuring tube is flangeless.
  • the measuring tube is over on both sides Welding or connectable with the pipeline via crimp seals.
  • the crimp seals are preassembled on the flowmeter.
  • the invention has for its object to provide a flow meter or a measuring tube for a flow meter, which is simple and inexpensive to produce.
  • the two end portions of the measuring tube in the direction of the longitudinal axis of the measuring tube are conical and have on its outer surface teeth which are configured and / or arranged such that a process connection, the corresponding teeth on its inner surface has, by sliding on one of the end portions in the press fit or clamped connectable to the measuring tube.
  • the measuring tube made of plastic. It has proved to be advantageous to produce the measuring tube of glass fiber reinforced polyamide or polyphthalamide.
  • the measuring tube is made of a conductive material
  • the inner surface of the measuring tube and the holes in which the measuring electrodes are arranged lined with a liner made of an electrically insulating material.
  • a magnetic-inductive flowmeter measuring tube that it has a substantially circular inner cross section in the two end regions, wherein the central region in which the magnet system is arranged, is approximately rectangular or oval ,
  • a transition region between the circular cross section of the measuring tube and the rectangular or oval cross-section of the measuring tube is designed to be continuous or stepped. It has been found that, in particular, the step-shaped adaptation of the different internal cross-sections is very advantageous: the pressure loss behind the constriction is relatively small in the step-shaped transition region, which is why the measured values are characterized by good reproducibility.
  • the necessary stability and compressive strength, reinforcing webs extending in the circumferential direction and / or in the longitudinal direction are provided on the outer wall of the measuring tube, which are arranged and / or configured such that this area of the measuring tube is pressure-resistant up to a predetermined maximum pressure of the flowing medium.
  • a variant of the inventive solution provides that an inner tube is inserted into the measuring tube. In this embodiment, it is sufficient if this inner tube withstands a desired high process pressure.
  • the outer shell has a purely mechanical protective function and / or it is a support member for other components of the flowmeter, e.g. for a display unit or a battery compartment, etc.
  • Device or the measuring tube according to the invention is in the process connection preferably an adapter with loose flange, an adapter with a fixed flange, an adapter with sleeve or an adapter with a straight piece of pipe.
  • the adapter is designed so that it is mounted there by simply pushing on the corresponding end portion of the measuring tube there in a press fit.
  • the adapter is freely selectable with regard to the material and its dimensions, depending on the pipeline into which the flowmeter is to be inserted. If, for example, the pipeline is a plastic pipe, an appropriate plastic part with a suitable pipe section can also be used as an adapter be used, which is subsequently welded to the pipeline.
  • Flow meter provides that provided between the adapter or the process connection and the measuring tube a seal.
  • the seal is preferably a sealing ring.
  • FIG. 1 is a schematic representation of a magnetic inductive flowmeter according to the invention
  • FIG. 2 shows a preferred embodiment of a measuring tube according to the invention, which is used in particular in conjunction with a magnetic-inductive flowmeter
  • Fig. 3 a perspective view of a process connection, consisting of adapter and pipe section, and
  • Fig. 4 a perspective view of a process connection, consisting of adapter and loose flange.
  • Fig. 1 shows a schematic representation of an embodiment of the device according to the invention 1.
  • the measuring tube 2 is flowed through by the medium 11 in the direction of the longitudinal axis 3 of the measuring tube 2.
  • the medium 11 is at least to a small extent electrically conductive.
  • the measuring tube 2 is made of an electrically conductive material, the measuring tube 2 must be lined on its inner surface 24 with an electrically non-conductive liner 17; the liner 17 is preferably made of a material that is highly chemically and / or mechanically resistant.
  • the perpendicular to the main flow direction S of the medium 11 aligned alternating magnetic field B is generated by a magnet system, for example via two diametrically arranged coil assemblies 6, 7 or via two diametrically arranged electromagnets.
  • a magnet system designed as a plug-in module is preferably used, as described in the German patent application filed at the same time as the present application Applicant is described in detail.
  • the plug-in module disclosed in the co-pending patent application in one-part or multi-part configuration is outstandingly suitable for mounting on the measuring tube 2 according to the invention.
  • 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 two measuring electrodes 4, 5 are preferably measuring electrodes, whose end region coming into contact with the medium 11 is widened.
  • these lenticular measuring electrodes to be mounted from the inside, naturally also externally mountable pin electrodes can be used.
  • the measuring electrodes 4, 5 are connected to the control evaluation unit 8.
  • the connection between the coil arrangements 6, 7 of the magnet system and the control / evaluation unit 8 takes place via the electrical 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 shows a preferred embodiment of a measuring tube 2 according to the invention, which is used in particular in conjunction with a magnetic-inductive flowmeter 1.
  • the measuring tube 2 is preferably made of glass fiber reinforced polyamide or polyphthalamide.
  • the measuring tube 2 has a substantially circular inner cross section in its first end region 18 and in its second end region 19.
  • the inner cross section in the central region 20, in which the magnet system 6, 7 is arranged, is approximately rectangular or oval. With this configuration, with the same design of the magnet system 6, 7, the magnetic field strength in Increases the range of the measured value, resulting in a better measurement performance of the flowmeter 1 reflected.
  • the inner cross section in the central region 20 may also be configured as a circular surface.
  • the inner surface of the measuring tube 2 in the transition region between the circular cross-section of the measuring tube 2 and the rectangular or oval cross section of the measuring tube 2 is formed continuously or stepwise. It has been found that, in particular, the step-shaped adaptation of the different internal cross-sections is very advantageous: The pressure loss of the medium 11 behind the constriction is relatively low in the step-shaped transition region, which is why the measured values are characterized by good reproducibility.
  • Area 20 to give the necessary stability and compressive strength are provided on the outer wall of the measuring tube 2 in the circumferential direction and / or longitudinally extending reinforcing webs 27 which are arranged and / or configured that this area of the measuring tube 2 up to a predetermined maximum pressure of flowing medium 11 is pressure-resistant.
  • FIGS. 3 and 4 In the two process connections shown in Fig. 2 are on the right side of the measuring tube 2 to an adapter 23 with a molded pipe section 24 and on the left side of the measuring tube 2 to an adapter 26 with a loose flange.
  • the pipe section 24 is designed so that it can be welded to the pipeline, for example.
  • the two configurations of a process connection are again shown separately and enlarged in perspective views in FIGS. 3 and 4.
  • Each of the two adapters 23, 26 has at least in a portion of its inner surface 30 teeth 22.
  • teeth 22 shown in Figure 2 are circumferential grooves on the inner surface of the adapter 23; 26th
  • the two end portions 18, 19 of the measuring tube 2 are conical formed and have on its outer surface 29 also circumferential, grooved gears 21.
  • the adapter 23, 26 correspond to each other. If the adapter 23, 26 with the application of force on an end portion 18; 19 of the measuring tube 2 postponed, it is via a press fit of the adapter 23; 26 on the end piece 18; 19 a rigid, preferably non-detachable connection between the adapter 23; 26 and the respective end region 18; 19 reached. It has been shown that this simple way to attach a process connection perfectly fulfills its purpose.
  • the adapter 23; 26 by pushing on the end portion 18; 19 are mounted in a simple manner on the measuring tube 2.
  • the adapter 23; 26 is freely selectable with regard to its design and the material, depending on the pipeline in which the flowmeter 1 is to be mounted. If, for example, the pipe is a plastic pipe, it is also possible to use as adapter 23 a corresponding plastic part with matching pipe piece 24, which may e.g. subsequently welded into the pipeline.
  • a seal is preferably provided between the adapter 26 or the process connection and the measuring tube 2.
  • the seal is preferably a sealing ring 28.

Landscapes

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

Abstract

L'invention concerne un tube de mesure pour un dispositif (1) utilisé pour déterminer ou contrôler le débit volumétrique ou massique d'un milieu (11) à travers une canalisation. Les deux faces terminales (18, 19) du tube de mesure (2) sont conçues de manière conique dans le sens de l'axe longitudinal (3) dudit tube de mesure (2) et présentent des dentures (21) au niveau de leur surface extérieure (29), qui sont conçues et/ou aménagées de sorte qu'un connecteur de processus ou un adaptateur (23; 26) présentant des dentures (22) correspondantes au niveau de sa surface intérieure (30) puisse être raccordé au tube de mesure (2), en ajustement serré ou de manière bloquée, par emboîtement par poussée sur la zone terminale (18; 19).
EP07848107A 2006-12-19 2007-12-14 Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation Withdrawn EP2126445A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610060446 DE102006060446A1 (de) 2006-12-19 2006-12-19 Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung
PCT/EP2007/063964 WO2008074742A1 (fr) 2006-12-19 2007-12-14 Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation

Publications (1)

Publication Number Publication Date
EP2126445A1 true EP2126445A1 (fr) 2009-12-02

Family

ID=39313307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07848107A Withdrawn EP2126445A1 (fr) 2006-12-19 2007-12-14 Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation

Country Status (3)

Country Link
EP (1) EP2126445A1 (fr)
DE (1) DE102006060446A1 (fr)
WO (1) WO2008074742A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014113843A1 (de) 2014-09-24 2016-03-24 Endress+Hauser Flowtec Ag Messrohr für ein Durchflussmessgerät und ein magnetisch-induktives Durchflussmessgerät

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008057755B4 (de) * 2008-11-17 2015-12-17 Krohne Ag Magnetisch-induktives Durchflußmeßgerät
DE102010029343A1 (de) 2010-05-27 2011-12-01 Endress + Hauser Flowtec Ag Adapter zum Anschluss eines flanschlossen Durchflussmessgeräts an eine Rohrleitung
DE102010031433A1 (de) 2010-07-16 2012-01-19 Endress + Hauser Flowtec Ag Einsatz für ein magnetisch-induktives Durchflussmessgerät
CN102758981B (zh) * 2012-06-19 2014-03-12 苏州海伦哲专用车辆有限公司 消防水带接头
DE102012213507B3 (de) * 2012-07-31 2013-08-22 Ifm Electronic Gmbh Magnetisch-induktives Durchflussmessgerät
DE102012110665A1 (de) * 2012-11-07 2014-05-08 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät und Anordnung

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US2696737A (en) * 1949-12-14 1954-12-14 Erdco Eng Corp Magnetic type flowmeter
US3794364A (en) * 1971-12-27 1974-02-26 Johns Manville Conduit end connection
US4195515A (en) * 1976-06-28 1980-04-01 Smoll Owen C In line electromagnetic flow measurement transducer
JPS5885118A (ja) * 1981-11-14 1983-05-21 Yokogawa Hokushin Electric Corp 電磁流量計
DE3730641A1 (de) * 1987-09-11 1989-03-30 Flowtec Ag Verfahren zur herstellung eines magnetisch-induktiven messrohres
DE10064845A1 (de) * 2000-12-23 2002-07-04 Abb Patent Gmbh Durchflussmesseinrichtung
DE10104149C2 (de) * 2001-01-30 2002-07-11 Gasversorgung Thueringen Gmbh Funktionseinheit von Gasdruckregler und Gaszähler
GB0329450D0 (en) * 2003-12-19 2004-01-28 Abb Ltd Electromagnetic flow meter insert
DE102004063617A1 (de) * 2004-12-02 2006-06-08 Krohne Ag Magnetisch-induktives Durchflußmeßgerät und Herstellungsverfahren für ein magnetisch-induktives Durchflußmeßgerät
DE202005020808U1 (de) * 2005-03-23 2006-08-24 Abb Patent Gmbh Magnetisch-induktiver Durchflussmesser mit elektrisch isoliertem Messrohr
PL205157B1 (pl) * 2005-04-26 2010-03-31 Kominus Spo & Lstrok Ka Z Ogra Złącze sprężystych rur cienkościennych

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None *
See also references of WO2008074742A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014113843A1 (de) 2014-09-24 2016-03-24 Endress+Hauser Flowtec Ag Messrohr für ein Durchflussmessgerät und ein magnetisch-induktives Durchflussmessgerät

Also Published As

Publication number Publication date
WO2008074742A1 (fr) 2008-06-26
DE102006060446A1 (de) 2008-06-26

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