EP2115401A1 - Dispositif destiné à mesurer le débit volumique ou massique d'un milieu dans une conduite - Google Patents
Dispositif destiné à mesurer le débit volumique ou massique d'un milieu dans une conduiteInfo
- Publication number
- EP2115401A1 EP2115401A1 EP08708166A EP08708166A EP2115401A1 EP 2115401 A1 EP2115401 A1 EP 2115401A1 EP 08708166 A EP08708166 A EP 08708166A EP 08708166 A EP08708166 A EP 08708166A EP 2115401 A1 EP2115401 A1 EP 2115401A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- measuring tube
- liner
- powder
- medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
- F16L58/1045—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being an extruded or a fused layer
-
- 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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
- F16L58/1027—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being a sprayed layer
-
- 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
- G01F1/584—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 electrodes, accessories therefor
-
- 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
- G01F15/14—Casings, e.g. of special material
Definitions
- the invention relates to a measuring tube for a flow meter, which determines or monitors the volume flow or the mass flow rate of a medium flowing in a pipeline.
- Flow meters work on the basis of different physical laws.
- the measuring tube is mounted in the medium through which the medium flows via two end fastening devices. Examples include magnetic inductive flowmeters, ultrasonic flowmeters, vortex flowmeters, Coriolis flowmeters or differential pressure gauges, which i.a. offered and distributed by the Applicant.
- Magnetic-inductive flowmeters make use of the principle of electrodynamic induction for volumetric flow measurement: charge carriers of the medium moving perpendicular to a magnetic field induce a measuring voltage in measuring electrodes arranged essentially perpendicularly to the flow direction of the medium.
- 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 determined.
- the measuring voltage is usually tapped via a measuring electrode pair, which is arranged in the region of maximum magnetic field strength and where consequently the maximum measuring voltage is to be expected.
- the measuring electrodes themselves are coupled to the medium either galvanically or capacitively.
- the inner surface of the measuring tube is usually lined with an electrically insulating liner.
- the liner consists for example of a thermoplastic, a thermosetting or an elastomeric plastic. Because of their good processability and their excellent mechanical resistance have proven in addition to hard rubber or fluorine-containing plastics such as PTFE, PFA, in particular polyurethane as a liner material for magnetic inductive measuring devices. PUR has the advantage over fluorine-containing plastics that it can be processed at relatively low temperatures.
- a so-called ribbon flow method is used for the manufacture of measuring tubes, which are lined with polyurethane liner.
- a PUR formed from a plurality of components is uniformly applied to the inner surface of the measuring tube by means of an applicator head.
- DE 10 2004 062 680 A1 introduces a process for the production of a PUR liner which is best suited for the drinking water sector. This known PUR is therefore especially useful for applications that have to meet high hygienic requirements.
- the invention has for its object to provide a cost-effective measuring tube for flow meters.
- a powder-coated plastic is applied as a primer, as a liner or as a protective layer for a liner at least in the region of the flowed through by the medium inner surface of the measuring tube.
- the powder coating is a polyamide (PA).
- PA polyamide
- PA 11/12 has the advantage that it has the approval for drinking water applications, and thus is universally applicable. Because of their excellent properties, preference is given to using PA11 or PA12 in conjunction with the measuring tube according to the invention. Both polyamides are characterized further by the fact that they have the drinking water approval.
- the powder-coated plastic is used according to the invention in three applications:
- the powder coating of PA11 / 12 is used as a primer or as a primer.
- another plastic hybrid component
- the liner material is preferably an elastomer, in particular a cast elastomer such as polyurethane.
- Polyurethane is - as already mentioned above - mechanically highly inert. Since, according to the invention, the primer consists of a powder-coated plastic which, moreover, is highly water vapor impermeable, the functionality of the flowmeter is ensured in a wide range of applications.
- the powder coating e.g. out
- PA11 / 12 used directly as liner material.
- This embodiment has the advantage that the application of the inner coating of the measuring tube can take place in one method step. This eliminates the cleaning, blasting and priming of the measuring tube. Depending on the application, it is provided that several layers of the powder coating are applied one above the other. In general, a high reduction of the production costs can be achieved with this embodiment. 3.
- a third application provides that a protective layer of the powder-coated plastic or powder coating is applied to a known liner. This protective layer prevents the diffusion of water vapor into the liner or through the liner to the conductive measuring tube.
- the liner is preferably an elastomer, in particular a polyurethane.
- the powder-coatable plastic is applied as a sealing layer on the elastomer liner.
- PA11 and PA12 Due to their polar character, PA11 and PA12 have good chemical coupling to conventional liner materials such as polyurethane.
- the multi-layer liner thus has a high dimensional stability and is characterized by a high water vapor diffusion and thermal shock resistance. It is of course possible to manufacture both the primer and the sealing layer of powder-coated hydrophobic plastic.
- the measuring tube is quasi redundant water vapor impermeable.
- the layer thickness of the plastic or the polyamide, which can be applied in an application process at a maximum of 1 mm. If larger layer thicknesses are required, the coating process may need to be repeated several times.
- the flow meter is, for example, a magnetically inductive flow meter with a magnet system which generates a magnetic field passing through the measuring tube, extending essentially transversely to the measuring tube axis. Furthermore, at least two measuring electrodes coupling to the medium are provided, which are mounted in bores in the measuring tube and which are arranged in a region of the measuring tube lying substantially perpendicular to the magnetic field.
- a control / evaluation unit supplies information about the volume or mass flow of the medium in the measuring tube based on the measuring voltage induced in the measuring electrodes.
- An advantageous development of the magnetic-inductive flowmeter according to the invention provides that it is at the measuring electrodes in each case are electrodes with an electrode shaft which is widened in a first end region in contact with the medium, and in that a seal is provided between a bearing surface of the widened end region of the measuring electrode facing the inner surface of the measuring tube and the corresponding inner surface of the measuring tube , This effectively reduces the risk of media entering the area between the bore and the measuring electrode causing a short circuit. Due to the excellent temperature resistance and high chemical resistance, a PTFE gasket, in particular a PTFE gasket, is preferably used.
- a circumferential locking edge is provided on the bearing surface of the widened end region, which presses in the mounted state in the seal.
- an advantageous development of the inventive magnetic inductive flowmeter suggests that in the second end of the measuring electrode, a fastening device is provided which is configured and arranged with respect to the electrode shaft such that the measuring electrode with a predeterminedêtanzugskraft in the bore is attached to the measuring tube - regardless of the temperature conditions prevailing in the measuring tube.
- the fasteners are fixed flanges to loose flanges or the measuring tube is formed as a wafer. All variants of fasteners are offered by the applicant in connection with the flowmeters manufactured by her.
- the fastening elements and / or the outer surface of the measuring tube is also provided with the powder-coated plastic at least in the two end regions of the measuring tube.
- Fig. 1 a schematic representation of magnetic-inductive
- FIG. 2 shows an enlarged view of the section marked A in FIG. 1, which outlines a first embodiment of the measuring tube according to the invention
- FIG. 3 shows an enlarged view of the section marked A in FIG. 1, which shows a second embodiment of the measuring tube according to the invention
- Fig. 4 is an enlarged view of the marked A in Fig. 1 section showing a third embodiment of the measuring tube according to the invention.
- Fig. 1 shows a schematic representation of a magnetic inductive flowmeter 1.
- the measuring tube 2 according to the invention is flowed through by the medium 11 in the direction of the measuring tube axis 3.
- the medium 11 is at least to a small extent electrically conductive.
- the measuring tube 2 is lined on its inner surface 30 with a liner 18.
- the liner 18 is made of a non-conductive material that is highly chemically and / or mechanically resistant.
- the liner 18 preferably consists of a plastic approved for drinking water applications. As a result, the flowmeter 1 is universally applicable for a variety of applications.
- Magnetic field B is generated via a magnet system, for example via two diametrically arranged coil arrangements 6, 7 or via two electromagnets. Under the influence of the magnetic field B, charge carriers located in the medium 11 migrate, depending on the polarity, to the two oppositely poled measuring electrodes 4, 5.
- 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, ie it is a measure of the volumetric flow of the medium 11 in the measuring tube 2.
- the measuring tube 2 is provided with connecting elements. z. B. flanges 27 - as can be seen in Fig. 5 - with a pipe 33 through which the medium 11 flows through connectable.
- the two measuring electrodes 4, 5 are mushroom-shaped measuring electrodes 4, 5, which are in direct contact with the medium 11.
- pin electrodes can also be used in conjunction with the solution according to the invention.
- the coupling to the medium 11 may of course also be capacitive in nature.
- the control evaluation unit 8 is connected to the control evaluation unit 8.
- the control / evaluation unit 8 is connected via the connecting line 16 to an input / output unit 9.
- the evaluation / control unit 8 is associated with the memory unit 10.
- FIGS. 2 to 4 enlarged views of the detail marked A in FIG. 1 can be seen in a sectional view.
- FIGS. 2, 3 and 4 relate to different embodiments of the measuring tube 2 according to the invention.
- the measuring tube 2 is each made of a conductive material, preferably of stainless steel.
- the primer 17 is a powder-coatable plastic, in particular PA11 or PA 12. Both polyamide are highly impermeable to water vapor.
- a Plastic liner 18 applied on the powder-coated polyamide primer 17 is a Plastic liner 18 applied.
- the liner 18 may be, for example, a cast elastomer such as polyurethane.
- an additional sealing layer 28 can be applied to the liner 18.
- a powder-coatable polyamide layer eg PA11, PA 12 with drinking water approval
- PA11 PA 12 with drinking water approval
- the liner 18 is applied directly to the inner surface 30 of the measuring tube 2 via a powder coating method. Typical layer thicknesses in powder coating are in the millimeter range.
- the embodiment of the measuring tube 2 shown in Fig. 4 has three layers: the primer 17, the liner 18 and a sealing layer 28.
- the sealing layer 28 is applied to the liner 18 via a powder coating.
- the liner 18 may be punctiform in the region of the measuring electrode 4; 5 fixed.
- the seal 19 is preferably designed as a sealing ring and consists in the case shown of PTFE.
- the fastening device 21, 22, 23 for the measuring electrode 4; 5 is configured and resiliently arranged with respect to the electrode shaft 26 in such a way that the measuring electrode 4, 5 is clamped in the bore 20 with a predetermined minimum tightening force independently of the temperature conditions prevailing in the measuring tube 2. It goes without saying that the fastening device 21, 22, 23 is not limited to the embodiment shown, but that each known clamping and fastening device for measuring electrodes 4, 5 is used in conjunction with the present invention.
- FIG. 5 shows a longitudinal section through the measuring tube 2 according to the invention in partial view.
- the measuring tube 2 is lined on its coming into contact with the medium 11 in the inner surface 30 with a powder-coatable liner 18.
- a powder-coatable liner 18 any of the aforementioned embodiments of the lining of the measuring tube 2 -powder coated liner 18 in isolation / with or without primer 17 / with or without sealing layer 28 - are used.
- the liner 18 applied by means of a powder coating method extends beyond the fastening flange 27 and also covers at least a portion of the outer surface 34 of the measuring tube 2.
- the time-consuming processing methods for galvanizing the flanges 27 can be saved.
- a powder-coated surface is distinguished from a galvanized by a better look.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
L'invention concerne un tube de mesure (2) destiné à un quelconque débitmètre (1), qui détermine ou contrôle le débit volumique ou le débit massique d'un milieu (11) s'écoulant dans une conduite (33). Une matière plastique pouvant être appliquée par poudrage est appliquée, en tant que couche primaire (17), en tant que garniture (18) ou en tant que couche de protection (28) pour une garniture (18), au moins dans la zone de la surface intérieure du tube de mesure (2), sur laquelle le milieu (11) s'écoule.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710005898 DE102007005898A1 (de) | 2007-02-01 | 2007-02-01 | Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung |
PCT/EP2008/050827 WO2008092794A1 (fr) | 2007-02-01 | 2008-01-24 | Dispositif destiné à mesurer le débit volumique ou massique d'un milieu dans une conduite |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2115401A1 true EP2115401A1 (fr) | 2009-11-11 |
Family
ID=39472693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08708166A Withdrawn EP2115401A1 (fr) | 2007-02-01 | 2008-01-24 | Dispositif destiné à mesurer le débit volumique ou massique d'un milieu dans une conduite |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2115401A1 (fr) |
CN (1) | CN101600946A (fr) |
DE (1) | DE102007005898A1 (fr) |
WO (1) | WO2008092794A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008059067A1 (de) | 2008-11-26 | 2010-06-02 | Krohne Ag | Magnetisch-induktives Durchflußmeßgerät |
JP5351655B2 (ja) * | 2009-08-19 | 2013-11-27 | アズビル株式会社 | 電磁流量計 |
DE102014113843A1 (de) * | 2014-09-24 | 2016-03-24 | Endress+Hauser Flowtec Ag | Messrohr für ein Durchflussmessgerät und ein magnetisch-induktives Durchflussmessgerät |
DE102015112018B3 (de) * | 2015-07-23 | 2016-07-14 | Endress+Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät zur Messung der Durchflussgeschwindigkeit oder dem Volumendurchfluss von Medien in einer Rohrleitung und Verfahren zur Herstellung eines solchen Durchflussmessgeräts |
DE102016123123A1 (de) | 2016-11-30 | 2018-05-30 | Endress+Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004062680A1 (de) * | 2004-12-21 | 2006-06-22 | Endress + Hauser Flowtec Ag | In-Line-Meßgerät mit einem Meßrohr und Verfahren zu dessen Herstellung |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4773275A (en) * | 1986-05-27 | 1988-09-27 | The Foxboro Company | Seal for ceramic flow tube |
US4774844A (en) * | 1987-06-25 | 1988-10-04 | Fischer & Porter Co. | Encapsulated electromagnetic flowmeter |
DE4302158C2 (de) * | 1993-01-27 | 1996-07-11 | Turbo Werk Messtechnik Gmbh | Magnetisch-induktiver Durchflußmesser |
GB2310287B (en) * | 1996-02-16 | 2000-05-31 | Danfoss Flowmetering Ltd | Measuring tube assemblies and methods of making the same for electromagnetic flowmeters |
FR2888309B1 (fr) * | 2005-07-05 | 2007-10-12 | Saipem S A Sa | Piece de raccordement de conduites comportant une chemise interne, procede de revetement et procede d'assemblage |
JP4562510B2 (ja) * | 2004-12-10 | 2010-10-13 | 三桜工業株式会社 | 多層樹脂チューブ |
-
2007
- 2007-02-01 DE DE200710005898 patent/DE102007005898A1/de not_active Withdrawn
-
2008
- 2008-01-24 WO PCT/EP2008/050827 patent/WO2008092794A1/fr active Application Filing
- 2008-01-24 CN CNA2008800039254A patent/CN101600946A/zh active Pending
- 2008-01-24 EP EP08708166A patent/EP2115401A1/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004062680A1 (de) * | 2004-12-21 | 2006-06-22 | Endress + Hauser Flowtec Ag | In-Line-Meßgerät mit einem Meßrohr und Verfahren zu dessen Herstellung |
Non-Patent Citations (1)
Title |
---|
See also references of WO2008092794A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008092794A1 (fr) | 2008-08-07 |
CN101600946A (zh) | 2009-12-09 |
DE102007005898A1 (de) | 2008-08-07 |
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