EP2126445A1 - Device for measuring the volumetric or mass flow of a medium in a pipeline - Google Patents

Device for measuring the volumetric or mass flow of a medium in a pipeline

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Withdrawn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)
French (fr)
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/en
Withdrawn legal-status Critical Current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

The invention relates to a measuring tube for a device (1), for determining or monitoring the volumetric or mass flow of a medium (11) through a pipeline. Both end regions (18, 19) of the measuring tube (2) are designed to be conical in the direction of the longitudinal axis (3) of the measuring tube (2) and have toothings (21) on the outer surface (29) thereof such that a process connector or adapter (23; 26), with corresponding toothings (22) on the inner surface (30) thereof may be connected t the measuring tube (2) by pushing onto the end region (18; 19) with a press-fit or clamped to the measuring tube (2).

Description

Beschreibung description
Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einerDevice for measuring the volume or mass flow of a medium in one
Rohrleitungpipeline
[0001] Die Erfindung betrifft eine Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung, mit einem Messrohr, das von dem Medium in Richtung der Längsachse des Messrohres durchströmt wird, mit einem Magnetsystem, das ein das Messrohr durchsetzendes, im wesentlichen quer zur Längsachse des Messrohres verlaufendes Magnetfeld erzeugt, mit zwei mit dem Medium koppelnden Messelektroden, die in einem im wesentlichen senkrecht zum Magnetfeld liegenden Bereich des Messrohres angeordnet sind, und mit einer Regel-/Auswerteeinheit, die anhand der in die Messelektroden induzierten Messspannung Information über den Volumen- oder Massestrom des Mediums in dem Messrohr liefert. Weiterhin betrifft die Erfindung ein Messrohr, das in Verbindung mit einem beliebig ausgestalteten Durchflussmessgerät verwendet werden kann. Bei dem Durchflussmessgerät handelt es sich beispielsweise um eine Coriolis- oder ein thermisches Durchflussmessgerät, ein magnetisch-induktives, ein Vortex- oder ein Schall- oder Ultraschall-Durchflussmessgerät.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. Furthermore, 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.
[0002] Nachfolgend wird die Erfindung bevorzugt in Verbindung mit einem magnetisch-induktiven Durchflussmessgerät beschrieben. Allerdings ist das erfindungsgemäß ausgestaltete Messrohr rinzipiell in Verbindung mit allen bekannten Arten von Durchflussmessgeräten einsetzbar.The invention will be described below preferably in conjunction with a magnetic-inductive flowmeter. However, the measuring tube designed according to the invention can in principle be used in conjunction with all known types of flowmeters.
[0003] Magnetisch-induktive Durchflussmessgeräte nutzen für die volumetrische Strömungsmessung das Prinzip der elektrodynamischen Induktion aus: Senk-recht zu einem Magnetfeld bewegte Ladungsträger des Mediums induzieren in gleichfalls im wesentlichen senkrecht zur Durchflussrichtung des Mediums und senkrecht zur Richtung des Magnetfeldes angeordnete Messelektroden eine Messspannung. Die in die Messelektroden induzierte Messspannung ist proportional zu der über den Querschnitt des Messrohres gemittelten Strömungsgeschwindigkeit des Mediums; sie ist also proportional zum Volumenstrom. Ist die Dichte des Mediums bekannt, lässt sich der Massestrom in der Rohrleitung bzw. in dem Messrohr bestimmen. Die Messspannung wird üblicherweise über ein Messelektrodenpaar abgegriffen, das bevorzugt in dem Bereich der maximalen Magnetfeldstärke angeordnet ist, also dort, wo die maximale Messspannung zu erwarten ist. Die Messelektroden sind üblicherweise galvanisch mit dem Medium gekoppelt; es sind jedoch auch magnetisch-induktive Durchflussmessgeräte mit kapazitiv koppelnden Messelektroden bekannt geworden.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.
[0004] Das Messrohr kann entweder aus einem elektrisch leitfähigen Material, z.B. Edelstahl, gefertigt sein, oder es besteht aus einem elektrisch isolierenden Material. Ist das Messrohr aus einem elektrisch leitfähigen Material gefertigt, so muss es in dem mit dem Medium in Kontakt kommenden Bereich mit einem Liner aus einem nicht-leitfähigen Material ausgekleidet sein. Der Liner besteht üblicherweise aus einem thermoplastischen, einem duroplastischen oder einem elastomeren Kunststoff. Es sind jedoch auch magnetisch-induktive Durchflussmessgeräte mit einer keramischen Auskleidung bekannt geworden.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. However, magnetic-inductive flow meters with a ceramic lining have also become known.
[0005] Die Messelektroden sind neben dem Magnetsystem die wesentlichenThe measuring electrodes are in addition to the magnetic system, the essential
Komponenten eines magnetisch-induktiven Durchflussmessgeräts. Bei der Ausgestaltung und Anordnung der Messelektroden ist darauf zu achten, dass sie möglichst einfach in dem Messrohr montiert werden können und dass nachfolgend im Messbetrieb keine Dichtigkeitsprobleme auftreten; darüber hinaus sollen sich die Messelektroden durch eine empfindliche und gleichzeitig störungsarme Messsignalerfassung auszeichnen. Bekannt geworden sind Stiftelektroden, die sich von außen an dem Messrohr montieren lassen, oder Messelektroden mit einem aufgeweiteten Elektrodenkopf, die von innen an dem Messrohr montiert werden.Components of a magnetic-inductive flowmeter. In the design and arrangement of the measuring electrodes, 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; In addition, the measuring electrodes should be distinguished by a sensitive and at the same time low-interference measurement signal acquisition. Known are 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.
[0006] Um das Durchflussmessgerät in der Rohrleitung zu montieren, sind üblicher-weise Flanschverbindungen vorgesehen, die an dem Durchflussmessgerät angebracht bzw. angeschweißt sind. Diese Schweißverbindungen sind relativ zeitaufwändig zu realisieren.To mount the flow meter in the pipeline, usually-flange connections are provided which are attached to the flow meter or welded. These welds are relatively time consuming to implement.
[0007] Aus der EP 1 715 303 A1 ist ein Durchflussmessgerät bekannt geworden, bei dem das Messrohr flanschlos ist. Das Messrohr ist beidseitig über Verschweißen oder über Quetschdichtmanschetten mit der Rohrleitung verbindbar. Bevorzugt sind die Quetschdichtmanschetten an dem Durchflussmessgerät vormontiert.From EP 1 715 303 A1 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. Preferably, the crimp seals are preassembled on the flowmeter.
[0008] Der Erfindung liegt die Aufgabe zugrunde, ein Durchflussmessgerät bzw. ein Messrohr für ein Durchflussmessgerät vorzuschlagen, das einfach und kostengünstig herstellbar ist.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.
[0009] Die Aufgabe wird dadurch gelöst, dass die beiden Endbereiche des Messrohres in Richtung der Längsachse des Messrohres konisch ausgestaltet sind und an ihrer Außenfläche Verzahnungen aufweisen, die derart ausgestaltet und/oder angeordnet sind, dass ein Prozessanschluss, der an seiner Innenfläche korrespondierende Verzahnungen aufweist, durch Aufschieben auf einen der Endbereiche im Presssitz bzw. klemmend mit dem Messrohr verbindbar ist.The object is achieved in that 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.
[0010] Gemäß einer bevorzugten Ausgestaltung der erfindungsgemäßen Vorrichtung bzw. des erfindungsgemäßen Messrohres besteht das Messrohr aus Kunststoff. Es hat sich als vorteilhaft erwiesen, das Messrohr aus Glasfaser verstärktem Polyamid oder Polypthalamid herzustellen.According to a preferred embodiment of the device according to the invention or the measuring tube according to the invention, the measuring tube made of plastic. It has proved to be advantageous to produce the measuring tube of glass fiber reinforced polyamide or polyphthalamide.
[0011] Alternativ ist vorgesehen, dass bei einem magnetisch-induktivenAlternatively, it is provided that in a magneto-inductive
Durchflussmessgerät, bei dem das Messrohr aus einem leitfähigen Material gefertigt ist, die Innenfläche des Messrohrs und die Bohrungen, in denen die Messelektroden angeordnet sind, mit einem Liner aus einem elektrisch isolierenden Material ausgekleidet ist.Flowmeter, wherein 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.
[0012] Weiterhin ist bei einem für ein magnetisch-induktives Durchflussmessgerät ausgelegtes Messrohr vorgesehen, dass es in den beiden Endbereichen einen im wesentlichen kreisförmigen Innen-Querschnitt aufweist, wobei der mittlere Bereich, in dem das Magnetsystem angeordnet ist, näherungsweise rechteckförmig oder oval ausgestaltet ist. Durch diese Ausgestaltung wird bei gleicher Auslegung des Magnetsystems die Magnetfeldstärke im Bereich der Messwerterfassung vergrößert, was sich in einer besseren Messperformance des Durchflussmessgeräts niederschlägt.Furthermore, it is provided in a designed for 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 , With this configuration, with the same design of the magnet system, the magnetic field strength in the area of the measured value acquisition is increased, which results in a better measurement performance of the flowmeter.
[0013] Weiterhin ist vorgesehen, dass ein Übergangsbereich zwischen dem kreisförmigen Querschnitt des Messrohrs und dem rechteckförmigen oder ovalen Querschnitt des Messrohrs kontinuierlich oder stufenförmig ausgestaltet ist. Es hat sich gezeigt, dass insbesondere die stufenförmige Anpassung der unterschiedlichen Innenquerschnitte sehr vorteilhaft ist: Der Druckverlust hinter der Einschnürung ist beim stufenförmigen ausgestalteten Übergangsbereich relativ gering, weshalb sich die Messwerte durch eine gute Reproduzierbarkeit auszeichnen.Furthermore, it is provided that 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.
[0014] Um dem Messrohr insbesondere in dem eingeschnürten Bereich die notwendige Stabilität und Druckfestigkeit zu verleihen, sind an der Außenwand des Messrohres in Umfangsrichtung und/oder in Längsrichtung verlaufende Verstärkungsstege vorgesehen, die so angeordnet und/oder ausgestaltet sind, dass dieser Bereich des Messrohres bis zu einem vorgegebenen Maximaldruck des strömenden Mediums druckfest ist. Um das Volumen des Innenraums des Messrohrs zu minimieren, sieht eine Variante der erfindungsgemäßen Lösung vor, dass in das Messrohr ein inneres Rohr eingefügt ist. Bei dieser Ausgestaltung genügt es, wenn dieses innere Rohr einem gewünschten hohen Prozessdruck standhält. In diesem Fall hat die 'äußere Hülle eine reine mechanische Schutzfunktion und/oder sie ist ein Trägerteil für weitere Komponenten des Durchflussmessgeräts, z.B. für eine Anzeigeeinheit oder ein Batteriefach, usw.In order to give the measuring tube, in particular in the constricted area, 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. In order to minimize the volume of the interior of the measuring tube, 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. In this case, 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.
[0015] Gemäß einer vorteilhaften Ausgestaltung der erfindungsgemäßen[0015] According to an advantageous embodiment of the invention
Vorrichtung bzw. des erfindungsgemäßen Messrohres handelt es sich bei dem Prozessanschluss bevorzugt um einen Adapter mit Losflansch, um einen Adapter mit einem fest angebrachten Flansch, um einen Adapter mit Muffe oder um einen Adapter mit einem geraden Rohrstück. Prinzipiell ist vorgesehen, dass der Adapter so ausgestaltet ist, dass er durch einfaches Aufschieben auf den entsprechenden Endbereich des Messrohres dort im Presssitz montiert ist. Der Adapter ist bezüglich des Materials und seiner Abmessungen in Abhängigkeit von der Rohrleitung, in die das Durchflussmessgerät eingefügt werden soll, frei wählbar. Handelt es sich beispielsweise bei der Rohrleitung um ein Kunststoffrohr, so kann auch als Adapter ein entsprechendes Kunststoffteil mit einem passenden Rohrstück verwendet werden, das nachfolgend an der Rohrleitung angeschweißt wird.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. In principle, it is provided that 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.
[0016] Eine vorteilhafte Ausgestaltung des erfindungsgemäßenAn advantageous embodiment of the invention
Durchflussmess-geräts sieht vor, dass zwischen dem Adapter bzw. dem Prozessanschluss und dem Messrohr eine Dichtung vorgesehen. Bevorzugt handelt es sich bei der Dichtung um einen Dichtring.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.
[0017] Die Erfindung wird anhand der nachfolgenden Figuren näher erläutert. Es zeigt:The invention will be explained in more detail with reference to the following figures. It shows:
[0018] Fig. 1 : eine schematische Darstellung eines erfindungsgemäßen magnetisch-induktiven Durchflussmessgeräts,1 is a schematic representation of a magnetic inductive flowmeter according to the invention,
[0019] Fig. 2: eine bevorzugte Ausgestaltung eines erfindungsgemäßen Messrohres, das insbesondere in Verbindung mit einem magnetisch-induktiven Durchflussmessgerät eingesetzt wird,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,
[0020] Fig. 3: eine perspektivische Darstellung eines Prozessanschlusses, bestehend aus Adapter und Rohrstück, undFig. 3: a perspective view of a process connection, consisting of adapter and pipe section, and
[0021] Fig. 4: eine perspektivische Darstellung eines Prozessanschlusses, bestehend aus Adapter und Losflansch.Fig. 4: a perspective view of a process connection, consisting of adapter and loose flange.
[0022] Fig. 1 zeigt eine schematische Darstellung einer Ausgestaltung der erfindungsgemäßen Vorrichtung 1. Das Messrohr 2 wird von dem Medium 11 in Richtung der Längsachse 3 des Messrohres 2 durchströmt. Das Medium 11 ist zumindest in geringem Umfang elektrisch leitfähig. Für den Fall, dass das Messrohr 2 aus einem elektrisch leitfähigen Material gefertigt ist, muss das Messrohr 2 an seiner Innenfläche 24 mit einem elektrisch nicht-leitfähigen Liner 17 ausgekleidet sein; der Liner 17 besteht bevorzugt aus einem Material, das in hohem Maße chemisch und/oder mechanisch beständig ist.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. In the event that 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.
[0023] Das senkrecht zur Hauptströmungsrichtung S des Mediums 11 ausgerichtete alternierende Magnetfeld B wird über ein Magnetsystem, z.B. über zwei diametral angeordnete Spulenanordnungen 6, 7 bzw. über zwei diametral angeordnete Elektromagnete, erzeugt. In Verbindung mit der erfindungs-gemäßen Lösung wird bevorzugt ein als Steckmodul ausgestaltetes Magnetsystem eingesetzt, wie es in der zeitgleich mit der vorliegenden Anmeldung eingereichten Deutschen Patentanmeldung der Anmelderin im Detail beschrieben ist. Das in der parallel eingereichten Patentanmeldung offenbarte Steckmodul in ein- oder mehrteiliger Ausgestaltung ist hervorragend für die Montage an dem erfindungsgemäßen Messrohr 2 geeignet.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. In conjunction with the solution according to the invention, 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.
[0024] Unter dem Einfluss der Magnetfeldes B wandern in dem Medium 11 befindliche Ladungsträger je nach Polarität zu den beiden entgegengesetzt gepolten Messelektroden 4, 5 ab. Die sich an den Messelektroden 4, 5 aufbauende Messspannung ist proportional zu der über den Querschnitt des Messrohres 2 gemittelten Strömungsgeschwindigkeit des Mediums 11 , d. h. sie ist ein Maß für den Volumenstrom des Mediums 11 in dem Messrohr 2.Under the influence of the magnetic field B carriers located in the medium 11 migrate depending on the polarity to the two oppositely poled measuring electrodes 4, 5 from. 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.
[0025] Bei den beiden Messelektroden 4, 5 handelt es sich bevorzugt um Messelektroden, deren mit dem Medium 11 in Kontakt kommender Endbereich aufgeweitet ist. Neben diesen linsenförmigen von innen zu montierenden Messelektroden können selbstverständlich auch von außen montierbare Stiftelektroden verwendet werden.The two measuring electrodes 4, 5 are preferably measuring electrodes, whose end region coming into contact with the medium 11 is widened. In addition to these lenticular measuring electrodes to be mounted from the inside, naturally also externally mountable pin electrodes can be used.
[0026] Über elektrische Verbindungsleitungen 12, 13 sind die Messelektroden 4, 5 mit der Regel-Auswerteeinheit 8 verbunden. Die Verbindung zwischen den Spulenanordnungen 6, 7 des Magnetsystems und der Regel-/Auswerteeinheit 8 erfolgt über die elektrischen Verbindungsleitungen 14, 15. Die Regel-/Auswerteeinheit 8 ist über die Verbindungsleitung 16 mit einer Eingabe-/Ausgabeeinheit 9 verbunden. Der Auswerte-/Regeleinheit 8 ist die Speichereinheit 10 zugeordnet.Via electrical connection lines 12, 13, 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.
[0027] Fig. 2 zeigt eine bevorzugte Ausgestaltung eines erfindungsgemäßen Messrohres 2, das insbesondere in Verbindung mit einem magnetisch-induktiven Durchflussmessgerät 1 einsetzbar ist. Das Messrohr 2 ist bevorzugt aus Glasfaser verstärktem Polyamid oder Polypthalamid gefertigt. Das Messrohr 2 hat in seinem ersten Endbereich 18 und in seinem zweiten Endbereich 19 einen im wesentlichen kreisförmigen Innenquerschnitt. Der Innenquerschnitt im mittleren Bereich 20, in dem das Magnetsystem 6, 7 angeordnet ist, ist näherungsweise rechteckförmig oder oval ausgestaltet. Durch diese Ausgestaltung wird bei gleicher Auslegung des Magnetsystems 6, 7 die Magnetfeldstärke im Bereich der Messwerterfassung vergrößert, was sich in einer besseren Messperformance des Durchflussmessgeräts 1 niederschlägt. Selbstverständlich kann der Innenquerschnitt im mittleren Bereich 20 auch als Kreisfläche ausgestaltet sein.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. Of course, the inner cross section in the central region 20 may also be configured as a circular surface.
[0028] Weiterhin ist vorgesehen, dass die Innenfläche des Messrohres 2 im Übergangsbereich zwischen dem kreisförmigen Querschnitt des Messrohrs 2 und dem rechteckförmigen oder ovalen Querschnitt des Messrohrs 2 kontinuierlich oder stufenförmig geformt ist. Es hat sich gezeigt, dass insbesondere die stufenförmige Anpassung der unterschiedlichen Innenquerschnitte sehr vorteilhaft ist: Der Druckverlust des Mediums 11 hinter der Einschnürung ist beim stufenförmigen ausgestalteten Übergangsbereich relativ gering, weshalb sich die Messwerte durch eine gute Reproduzierbarkeit auszeichnen.Furthermore, it is provided that 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.
[0029] Um dem Messrohr 2 insbesondere in dem eingeschnürten mittlerenTo the measuring tube 2 in particular in the constricted middle
Bereich 20 die notwendige Stabilität und Druckfestigkeit zu verleihen, sind an der Außenwand des Messrohres 2 in Umfangsrichtung und/oder in Längsrichtung verlaufende Verstärkungsstege 27 vorgesehen, die so angeordnet und/oder ausgestaltet sind, dass dieser Bereich des Messrohres 2 bis zu einem vorgegebenen Maximaldruck des strömenden Mediums 11 druckfest ist.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.
[0030] Bei den beiden in Fig. 2 dargestellten Prozessanschlüssen handelt es sich auf der rechten Seite des Messrohres 2 um einen Adapter 23 mit einem angeformten Rohrstück 24 und auf der linken Seite des Messrohres 2 um einen Adapter 26 mit Losflansch. Das Rohrstück 24 ist so ausgelegt, dass es beispielsweise an die Rohrleitung angeschweißt werden kann. Die beiden Ausgestaltungen eines Prozessanschlusses sind in den Figuren Fig. 3 und Fig. 4 in perspektivischen Darstellungen noch einmal gesondert und vergrößert dargestellt.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.
[0031] Jeder der beiden Adapter 23, 26 hat zumindest in einem Teilbereich seiner Innenfläche 30 Verzahnungen 22. Bei den in Fig. 2 gezeigten Verzahnungen 22 handelt es sich um umlaufende Rillen an der Innenfläche des Adapters 23; 26.Each of the two adapters 23, 26 has at least in a portion of its inner surface 30 teeth 22. In the teeth 22 shown in Figure 2 are circumferential grooves on the inner surface of the adapter 23; 26th
[0032] Die beiden Endbereiche 18, 19 des Messrohres 2 sind konisch ausgebildet und weisen an ihrer Außenfläche 29 gleichfalls umlaufende, rillenförmige Verzahnungen 21. Die Verzahnungen 21 an der AußenflächeThe 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 teeth 21 on the outer surface
29 des Endstückes 18; 19 und die Verzahnungen 22 an der Innenfläche29 of the end piece 18; 19 and the teeth 22 on the inner surface
30 des Adapters 23, 26 korrespondieren zueinander. Wird der Adapter 23, 26 unter Kraftaufwendung auf einen Endbereich 18; 19 des Messrohres 2 aufgeschoben, so wird über einen Presssitz des Adapters 23; 26 auf dem Endstück 18; 19 eine starre, bevorzugt unlösbare Verbindung zwischen dem Adapter 23; 26 und dem jeweiligen Endbereich 18; 19 erreicht. Es hat sich gezeigt, dass diese einfache Möglichkeit zur Befestigung eines Prozessanschlusses ihren Zweck hervorragend erfüllt.30 of 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.
[0033] Es versteht sich von selbst, dass an dem Adapter 23, 26 auch einIt goes without saying that on the adapter 23, 26 also a
Festflansch angebracht sein kann. Möglich ist darüber hinaus auch ein Adapter mit Muffe. Welche Art von Prozessanschluss auch immer die jeweiligen Anforderungen des Kunden optimal erfüllt, stets kann der Adapter 23; 26 durch Aufschieben auf den Endbereich 18; 19 in einfacher Art und Weise an dem Messrohr 2 montiert werden. Der Adapter 23; 26 ist in Abhängigkeit von der Rohrleitung, in der das Durchflussmessgerät 1 montiert werden soll, hinsichtlich seiner Ausgestaltung und des Materials frei wählbar. Handelt es sich beispielsweise bei der Rohrleitung um ein Kunststoffrohr, so kann auch als Adapter 23 ein entsprechendes Kunststoffteil mit passendem Rohrstück 24 verwendet werden, das z.B. nachfolgend in die Rohrleitung eingeschweißt wird.Fixed flange can be attached. It is also possible an adapter with sleeve. Whatever type of process connection optimally fulfills the respective requirements of the customer, 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.
[0034] Wird als Prozessanschluss beispielsweise ein Adapter 26 mit Losflansch 25 eingesetzt, so ist bevorzugt zwischen dem Adapter 26 bzw. dem Prozessanschluss und dem Messrohr 2 eine Dichtung vorgesehen. Bevorzugt handelt es sich bei der Dichtung um einen Dichtring 28.If, for example, an adapter 26 with a loose flange 25 is used as the process connection, 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.
[0035] Bezugszeichenliste[0035] List of Reference Numerals
1. Magnetisch-induktives Durchflussmessgerät1. Magnetic-inductive flowmeter
2. Messrohr2nd measuring tube
3. Längsachse des Messrohres 4. Messelektrode3. longitudinal axis of the measuring tube 4. measuring electrode
5. Messelektrode5. Measuring electrode
6. Spulenanordnung / Magnetsystem6. coil arrangement / magnet system
7. Spulenanordnung / Magnetsystem7. coil arrangement / magnet system
8. Regel-/Auswerteeinheit8. Control / evaluation unit
9. Eingabe-/Ausgabeeinheit9. input / output unit
10. Speichereinheit10. Storage unit
11. Medium11. Medium
12. Verbindungsleitung12. Connecting line
13. Verbindungsleitung13. Connecting line
14. Verbindungsleitung14. Connection line
15. Verbindungsleitung15. Connecting line
16. Verbindungsleitung16. Connecting line
17. Liner17. Liner
18. Erster Endbereich18. First end area
19. Zweiter Endbereich19. Second end area
20. Mittlerer Bereich20. Middle range
21. Verzahnung21. Interlocking
22. Verzahnung22. toothing
23. Adapter mit integriertem Rohrstück23. Adapter with integrated pipe section
24. Rohrstück24. Pipe piece
25. Losflansch25. Loose flange
26. Adapter für Losflansch26. Adapter for loose flange
27. Verstärkungssteg27. Reinforcing bar
28. Dichtring / Dichtung28. Sealing ring / seal
29. Außenfläche29. outer surface
30. Innenfläche 30th inner surface

Claims

Ansprüche claims
1. 1. Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums (11) in einer Rohrleitung, mit einem Messrohr (2), das von dem Medium (11) in Richtung der Längsachse (3) des Messrohres (2) durchströmt wird, mit einem Magnetsystem (6, 7), das ein das Messrohr (2) durchsetzendes, im wesentlichen quer zur Längsachse (3) des Messrohres (2) verlaufendes Magnetfeld (B) erzeugt, mit zwei mit dem Medium (11) koppelnden Messelektroden (4, 5), die in einem im wesentlichen senkrecht zum Magnetfeld (B) liegenden Bereich des Messrohres (2) angeordnet sind, und mit einer Regel-/Auswerteeinheit (8), die anhand der in die Messelektroden (4, 5) induzierten Messspannung Information über den Volumen- oder Massestrom des Mediums (11) in dem Messrohr (2) liefert, dadurch gekennzeichnet, dass die beiden Endbereiche (18, 19) des Messrohres (2) in Richtung der Längsachse (3) des Messrohres (2) konisch ausgestaltet sind und an ihrer Außenfläche (29) Verzahnungen (21) aufweisen, die derart ausgestaltet und/oder angeordnet sind, dass ein Prozessanschluss (23, 24; 26; 25) durch Aufschieben auf einen der Endbereiche (18; 19) im Presssitz mit dem Messrohr (2) verbunden ist.1. A device for measuring the volume or mass flow of a medium (11) in a pipeline, with a measuring tube (2) which is flowed through by the medium (11) in the direction of the longitudinal axis (3) of the measuring tube (2), with a magnet system (6, 7) which generates a magnetic field (B) passing through the measuring tube (2) substantially transverse to the longitudinal axis (3) of the measuring tube (2), with two measuring electrodes (4) coupling to the medium (11) , 5), which are arranged in a lying substantially perpendicular to the magnetic field (B) region of the measuring tube (2), and with a control / evaluation unit (8), based on the in the measuring electrodes (4, 5) induced measuring voltage information via the volume or mass flow of the medium (11) in the measuring tube (2) supplies, characterized in that the two end regions (18, 19) of the measuring tube (2) in the direction of the longitudinal axis (3) of the measuring tube (2) conically configured are and on their outer surface (29) have toothings (21), which are so out staltet and / or arranged that a process connection (23, 24; 26; 25) is connected by being pushed onto one of the end regions (18, 19) in an interference fit with the measuring tube (2).
2. 2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass das Messrohr (2) aus Kunststoff, vorzugsweise aus Glasfaser verstärktem Polyamid, besteht.2. Apparatus according to claim 1, characterized in that the measuring tube (2) made of plastic, preferably made of glass fiber reinforced polyamide.
3. 3. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass für den Fall, dass das Messrohr (2) aus einem leitfähigen Material gefertigt ist, die Innenfläche des Messrohrs (2) und die Bohrung, in der die Messelektrode (6, 7) angeordnet ist, mit einem Liner (17) aus einem elektrisch isolierenden Material ausgekleidet ist.3. A device according to claim 1, characterized in that in the case that the measuring tube (2) is made of a conductive material, the inner surface of the measuring tube (2) and the bore in which the measuring electrode (6, 7) is arranged, lined with a liner (17) made of an electrically insulating material.
4. 4. Vorrichtung nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass das Messrohr (2) in den beiden Endbereichen (18, 19) einen im wesentlichen kreisförmigen Innen-Querschnitt aufweist, wobei der mittlere Bereich (20), in dem das Magnetsystem (6, 7) angeordnet ist, näherungsweise rechteckförmig oder oval ausgestaltet ist.4. The device according to claim 1, 2 or 3, characterized in that the measuring tube (2) in the two end regions (18, 19) has a substantially circular inner cross-section, wherein the middle Region (20) in which the magnet system (6, 7) is arranged, is approximately rectangular or oval.
5. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, wobei ein Übergangsbereich zwischen dem kreisförmigen Querschnitt des Messrohrs (2) und dem rechteckförmigen oder ovalen Querschnitt des Messrohrs (2) kontinuierlich oder stufenförmig ausgestaltet ist.5. The device according to claim 4, characterized in that a 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 designed to be continuous or stepped.
6. 6. Vorrichtung nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass an der Außenwand des Messrohres (2) in Umfangsrichtung und/oder in Längsrichtung verlaufende Verstärkungsstege (27) vorgesehen sind, die so angeordnet und ausgestaltet sind, dass das Messrohr (2) in dem eingeschnürten mittleren Bereich (20) bis zu einem vorgegebenen Maximaldruck des Mediums (11) druckfest ist.6. The device according to claim 1, 2 or 3, characterized in that on the outer wall of the measuring tube (2) in the circumferential direction and / or longitudinally extending reinforcing webs (27) are provided, which are arranged and configured such that the measuring tube (2) in the constricted central region (20) to a predetermined maximum pressure of the medium (11) is pressure-resistant.
7. 7. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass es sich bei dem Prozessanschluss (23, 24; 26, 25) bevorzugt um einen Adapter (26) mit Losflansch (25), um einen Adapter mit einem fest angebrachten Flansch, um einen Adapter mit Muffe oder um einen oder um einen Adapter (23) mit einem Rohrstück (24) handelt.A device according to claim 1, characterized in that the process connection (23, 24; 26, 25) is preferably a loose flange adapter (26) around an adapter with a fixed flange an adapter with a sleeve or around or around an adapter (23) with a pipe section (24) acts.
8. 8. Vorrichtung nach Anspruch 1 oder 7, dadurch gekennzeichnet, dass zumindest eine Dichtung (28) zwischen dem Adapter (26) bzw. dem Prozessanschluss und dem Messrohr (2) vorgesehen ist.8. The device according to claim 1, wherein at least one seal is provided between the adapter and the process connection and the measuring tube.
9. 9. Messrohr für eine Vorrichtung zur Bestimmung oder Überwachung des Volumen- oder Massestroms eines Mediums (11) durch eine Rohrleitung, dadurch gekennzeichnet, dass die beiden Endbereiche (18, 19) des Messrohres (2) in Richtung der Längsachse (3) des Messrohres (2) konisch ausgestaltet sind und an ihrer Außenfläche (29) Verzahnungen (21) aufweisen, die derart ausgestaltet und/oder angeordnet sind, dass ein Prozessanschluss bzw. ein Adapter (23; 26), der an seiner Innenfläche (30) korrespondierend ausgestaltete Verzahnungen (22) aufweist, durch Aufschieben auf einen Endbereich (18; 19) durch Presssitz bzw. klemmend mit dem Messrohr (2) verbindbar ist. 9. Measuring tube for a device for determining or monitoring the volume or mass flow of a medium (11) through a pipeline, characterized in that the two end regions (18, 19) of the measuring tube (2) in the direction of the longitudinal axis (3) of the measuring tube (2) are conical and have on their outer surface (29) teeth (21), which are designed and / or arranged such that a process connection or an adapter (23; 26) which on its inner surface (30) having correspondingly configured toothings (22), by being pushed onto an end region (18; 19) by press fit or clamping with the measuring tube (2) is connectable.
EP07848107A 2006-12-19 2007-12-14 Device for measuring the volumetric or mass flow of a medium in a pipeline Withdrawn EP2126445A1 (en)

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DE200610060446 DE102006060446A1 (en) 2006-12-19 2006-12-19 Device for measuring the volume or mass flow of a medium in a pipeline
PCT/EP2007/063964 WO2008074742A1 (en) 2006-12-19 2007-12-14 Device for measuring the volumetric or mass flow of a medium in a pipeline

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DE102014113843A1 (en) 2014-09-24 2016-03-24 Endress+Hauser Flowtec Ag Measuring tube for a flowmeter and a magnetic-inductive flowmeter

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