DE102006036910A1 - Magnetic-inductive flow measuring meter for medium in pipeline, has grid or netting or fabric mat that is provided as support body for liner made polyurethane, where body is arranged adjacent to inner surface of tube and liner coats tube - Google Patents
Magnetic-inductive flow measuring meter for medium in pipeline, has grid or netting or fabric mat that is provided as support body for liner made polyurethane, where body is arranged adjacent to inner surface of tube and liner coats tube Download PDFInfo
- Publication number
- DE102006036910A1 DE102006036910A1 DE200610036910 DE102006036910A DE102006036910A1 DE 102006036910 A1 DE102006036910 A1 DE 102006036910A1 DE 200610036910 DE200610036910 DE 200610036910 DE 102006036910 A DE102006036910 A DE 102006036910A DE 102006036910 A1 DE102006036910 A1 DE 102006036910A1
- Authority
- DE
- Germany
- Prior art keywords
- liner
- tube
- measuring tube
- medium
- measuring
- 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- Withdrawn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
-
- 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
-
- 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
Abstract
Description
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 Messrohrachse durchströmt wird, mit einem Magnetsystem, das ein das Messrohr durchsetzendes, im wesentlichen quer zur Messrohrachse verlaufendes Magnetfeld erzeugt, mit zumindest einer mit dem Medium gekoppelten Messelektrode, die in einem im wesentlichen senkrecht zum Magnetfeld liegenden Bereich des Messrohres angeordnet ist, und mit einer Regel-/Auswerteeinheit, die anhand der in die zumindest eine Messelektrode induzierten Messspannung Information über den Volumen- oder Massestrom des Mediums in dem Messrohr liefert.The The invention relates to a device for measuring the volume or Mass flow of a medium in a pipeline, with a measuring tube, which flows through the medium in the direction of the measuring tube axis, with a magnetic system, the one passing through the measuring tube, in produces a substantial transverse magnetic field across the measuring tube axis, with at least one measuring electrode coupled to the medium, the in a region substantially perpendicular to the magnetic field the measuring tube is arranged, and with a control / evaluation unit, the information obtained via the in the at least one measuring electrode induced measuring voltage information about the Volume or mass flow of the medium in the measuring tube supplies.
Magnetisch-induktive Durchflussmessgeräte nutzen für die volumetrische Strömungsmessung das Prinzip der elektrodynamischen Induktion aus: Senkrecht zu einem Magnetfeld bewegte Ladungsträger des Mediums induzieren in gleichfalls im wesentlichen senkrecht zur Durchflussrichtung des Mediums 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 in dem Bereich maximaler Magnetfeldstärke angeordnet ist und wo folglich die maximale Messspannung zu erwarten ist. Die Messelektroden selbst sind mit dem Medium entweder galvanisch oder kapazitiv gekoppelt.Electromagnetic Use flowmeters for the volumetric flow measurement the principle of electrodynamic induction from: perpendicular to one Magnetic field moving charge carriers of the In addition, mediums induce substantially perpendicular to Flow direction of the medium arranged measuring electrodes a measuring voltage. The measuring voltage induced in the measuring electrodes is proportional to the over the average cross-section of the measuring tube flow velocity of the medium; it is therefore proportional to the volume flow. Is the density of the medium known, lets determine the mass flow in the pipe or in the measuring tube. The measuring voltage is usually over Taken off pair of measuring electrodes 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 either galvanic or with the medium capacitively coupled.
Um das Messrohr, das z.B. aus Edelstahl gefertigt ist, chemisch und elektrisch zu isolieren, ist die Innenfläche des Messrohrs üblicherweise mit einem elektrisch isolierenden Liner ausgekleidet. Der Liner besteht z.B. aus einem thermoplastischen, einem duroplastischen oder einem elastomeren Kunststoff.Around the measuring tube, e.g. is made of stainless steel, chemical and electrically isolate, the inner surface of the measuring tube is usually lined with an electrically insulating liner. The liner exists e.g. from a thermoplastic, a thermoset or a elastomeric plastic.
Wegen ihrer guten Verarbeitbarkeit und ihrer ausgezeichneten chemischen und mechanischen Beständigkeit haben sich neben Hartgummi oder fluorhaltigen Kunststoffen, wie z.B. PTFE, PFA, in besonderem Maße auch Polyurethane (im folgenden PU) als Linermaterial für magnetisch-induktive Messgeräte bewährt. PU hat gegenüber den fluorhaltigen Kunststoffen den Vorteil, dass es bei relativ niedrigen Temperaturen verarbeitet werden kann.Because of their good processability and their excellent chemical and mechanical resistance In addition to hard rubber or fluorine-containing plastics, such as e.g. PTFE, PFA, in particular also polyurethanes (in the following PU) as liner material for Magnetic-inductive measuring devices proven. PU has opposite the fluorine-containing plastics have the advantage that it is at relative low temperatures can be processed.
Aus
der
Nachteilig ist bei dieser Lösung die Fixierung des Metallgitters an der Innenfläche des Messrohres, da diese Fixierung einen zusätzlichen Fertigungsschritt darstellt. Zu erwähnen ist weiterhin, dass die Applikation eines thermoplastischen Kunststoff-Liners bei Temperaturen erfolgen muss, die wesentlich höher sind, als die Temperaturen, bei denen ein PU-Liner appliziert werden kann.adversely is at this solution the fixation of the metal grid on the inner surface of the measuring tube, since this Fixation an additional Represents manufacturing step. It should also be mentioned that the application a thermoplastic plastic liner at temperatures that has to be much higher are, as the temperatures at which a PU liner are applied can.
Zur
Fertigung von Messrohren, die mit Polyurethan-Liner ausgekleidet
sind, wird bevorzugt ein sogenanntes Ribbon-Flow-Verfahren angewendet. Hierbei
wird ein aus mehreren Komponenten gebildetes PU mittels eines Gieß- oder
Sprühkopfes
auf die Innenfläche
des Messrohrs gleichmäßig appliziert.
Von der Anmelderin wird in der
- – die Einhaltung der maximal tolerierbaren Migrationsrate hinsichtlich eines gesamtorganischen Kohlenstoffgehaltes und/oder
- – die Einhaltung von für toxikologisch kritische Substanzen definierten spezifischen Migrationsgrenzwerten;
- – die Wirkung des Liners im Hinblick auf die äußere Beschaffenheit des Trinkwassers. Hier handelt es sich insbesondere um die Geschmacks-, Färbungs-, Trübungs- und/oder Geruchsneutralität des Liners bei Anwesenheit von Wasser. Ebenfalls zu nennen sind in diesem Zusammenhang die maximal tolerierbaren Chlorzehrungsraten.
- The observance of the maximum tolerable migration rate with regard to a total organic carbon content and / or
- - compliance with specific migration limits defined for toxicologically critical substances;
- - the effect of the liner on the external nature of the drinking water. This is in particular the taste, color, turbidity and / or odor neutrality of the liner in the presence of water. Also to be mentioned in this connection are the maximum tolerable chlorine consumption rates.
Damit der PU-Liner an der Innenfläche des Messrohres haftet, ist es notwendig, einen Haftvermittler bzw. einen Primer vorab auf die Innenfläche des Messrohrs zu applizieren. Das Aufbringen und Aushärten des Primers erfordert zwei zusätzliche Arbeitsschritte bei der Fertigung, die relativ zeitintensiv sind.In order to the PU liner on the inner surface the measuring tube adheres, it is necessary to use a bonding agent or apply a primer in advance to the inner surface of the measuring tube. The application and curing of the primer requires two additional Work steps in the production, which are relatively time consuming.
Werden die mit einem Polyurethan-Liner ausgekleideten Messrohre Härtetests unterzogen, bei denen die Messrohre relativ großen Temperaturschwankungen ausgesetzt sind, so hat es sich gezeigt, dass das Linermaterial zur Blasenbildung neigt. Im Extremfall führt dies zu einer höchst unerwünschten Ablösung des Liners von der Innenfläche des Messrohrs.Become the measuring tubes lined with a polyurethane liner hardness tests subjected in which the measuring tubes relatively large temperature fluctuations exposed, it has been shown that the liner material tends to blister. In extreme cases, this leads to a highly undesirable replacement of the liner from the inside surface of the Measuring tube.
Der Erfindung liegt die Aufgabe zugrunde, ein magnetisch-induktives Durchflussmessgerät für den Trinkwasserbereich vorzuschlagen.Of the Invention is based on the object, a magnetic-inductive Flowmeter for the To propose drinking water area.
Die Aufgabe wird dadurch gelöst, dass ein Gitter oder eine Gewebematte als Stützkörper für einen Liner aus einem trinkwassertauglichen Elastomer vorgesehen ist, dass der Stützkörper in unmittelbarer Nähe zur Innenfläche des Messrohres angeordnet ist und dass der trinkwassertaugliche, auf PU basierende Liner das Messrohr auskleidet. Der Einsatz eines Gitters aus Kunststoff oder eines Gewebes, beispielsweise einer Gewebematte aus Polyester oder einem textilen Gewebe, stellt eine sehr kostengünstige Lösung dar. Diese Lösung ist aufgrund der relativ niedrigen Verarbeitungstemperaturen des PU-Liners möglich. Besonders vorteilhaft ist die vorliegende Erfindung auch dadurch, dass durch den Einsatz eines Gitters oder einer Matte auf den Primer und das relativ zeitaufwändige Applizierrn des Primers verzichtet werden.The Task is solved by that a grid or a fabric mat as a support body for a liner from a drinking water suitable Elastomer is provided that the support body in close proximity to the inner surface of the Measuring tube is arranged and that the drinking water suitable, on PU based liners lining the measuring tube. The use of a grid made of plastic or a fabric, for example a fabric mat made of polyester or a textile fabric, represents a very cost effective solution. This solution is due to the relatively low processing temperatures of the PU liner possible. The present invention is also particularly advantageous in that that by using a grid or a mat on the primer and the relatively time consuming Applizierrn the primer be waived.
Es versteht sich von selbst, dass das Gitter bzw. das Geflecht auch aus Metall, beispielsweise aus Edelstahl, gefertigt sein kann.It It goes without saying that the grid or the braid too made of metal, for example stainless steel, can be made.
Die Erfindung wird anhand der nachfolgenden Figuren näher erläutert. Es zeigt:The The invention will be explained in more detail with reference to the following figures. It shows:
Das
Messrohr
Das
senkrecht zur Strömungsrichtung
des Mediums
In
den beiden gezeigten Fällen
befinden sich die Messelektroden
Über Verbindungsleitungen
Erfindungsgemäß handelt
es sich bei dem Liner, der die Innenfläche des Messrohres
Durch
den Stützkörper
Bei
der in
- 11
- Magnetisch-induktives DurchflussmessgerätElectromagnetic Flowmeter
- 22
- Messrohrmeasuring tube
- 33
- MessrohrachseMeasuring tube axis
- 44
- Messelektrodemeasuring electrode
- 55
- Messelektrodemeasuring electrode
- 66
- Spulenanordnung/ElektromagnetCoil assembly / solenoid
- 77
- Spulenanordnung/ElektromagnetCoil assembly / solenoid
- 88th
- Regel-/AuswerteeinheitControl / evaluation unit
- 99
- Eingabe-/AusgabeeinheitInput / output unit
- 1010
- Speichereinheitstorage unit
- 1111
- Mediummedium
- 1212
- Verbindungsleitungconnecting line
- 1313
- Verbindungsleitungconnecting line
- 1414
- Verbindungsleitungconnecting line
- 1515
- Verbindungsleitungconnecting line
- 1616
- Verbindungsleitungconnecting line
- 1717
- Stützkörper/Gitter bzw. Geflecht/GewebematteSupport body / grid or braid / fabric mat
- 1818
- Trinkwassertauglicher LinerRuggedized drinking water liner
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610036910 DE102006036910A1 (en) | 2006-08-04 | 2006-08-04 | Magnetic-inductive flow measuring meter for medium in pipeline, has grid or netting or fabric mat that is provided as support body for liner made polyurethane, where body is arranged adjacent to inner surface of tube and liner coats tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610036910 DE102006036910A1 (en) | 2006-08-04 | 2006-08-04 | Magnetic-inductive flow measuring meter for medium in pipeline, has grid or netting or fabric mat that is provided as support body for liner made polyurethane, where body is arranged adjacent to inner surface of tube and liner coats tube |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102006036910A1 true DE102006036910A1 (en) | 2008-02-07 |
Family
ID=38885033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200610036910 Withdrawn DE102006036910A1 (en) | 2006-08-04 | 2006-08-04 | Magnetic-inductive flow measuring meter for medium in pipeline, has grid or netting or fabric mat that is provided as support body for liner made polyurethane, where body is arranged adjacent to inner surface of tube and liner coats tube |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102006036910A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008014712A1 (en) | 2008-03-18 | 2009-09-24 | Endress + Hauser Flowtec Ag | Measuring device e.g. coriolis measuring device, for e.g. determining physical measurand of substance in pipe line, has housing, where device is made of composite, which has component made of renewable raw materials and embedded in plastic |
DE102014114289A1 (en) * | 2014-10-01 | 2016-04-07 | Endress+Hauser Flowtec Ag | Measuring tube for a flowmeter, a method for manufacturing a measuring tube and a magnetic-inductive flowmeter |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6385408A (en) * | 1986-09-30 | 1988-04-15 | Yokogawa Electric Corp | Production of measuring tube for electromagnetic flowmeter |
GB2402219A (en) * | 2003-05-29 | 2004-12-01 | Abb Ltd | Electromagnetic flow meter |
DE10358268A1 (en) * | 2003-12-11 | 2005-07-21 | Endress + Hauser Process Solutions Ag | Magnetoinductive mass flow sensor has a mounting pipe with an insulating liner within it, whereby lining and mounting are linked by a groove in the mounting and a matching projection from the lining |
-
2006
- 2006-08-04 DE DE200610036910 patent/DE102006036910A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6385408A (en) * | 1986-09-30 | 1988-04-15 | Yokogawa Electric Corp | Production of measuring tube for electromagnetic flowmeter |
GB2402219A (en) * | 2003-05-29 | 2004-12-01 | Abb Ltd | Electromagnetic flow meter |
DE10358268A1 (en) * | 2003-12-11 | 2005-07-21 | Endress + Hauser Process Solutions Ag | Magnetoinductive mass flow sensor has a mounting pipe with an insulating liner within it, whereby lining and mounting are linked by a groove in the mounting and a matching projection from the lining |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008014712A1 (en) | 2008-03-18 | 2009-09-24 | Endress + Hauser Flowtec Ag | Measuring device e.g. coriolis measuring device, for e.g. determining physical measurand of substance in pipe line, has housing, where device is made of composite, which has component made of renewable raw materials and embedded in plastic |
DE102014114289A1 (en) * | 2014-10-01 | 2016-04-07 | Endress+Hauser Flowtec Ag | Measuring tube for a flowmeter, a method for manufacturing a measuring tube and a magnetic-inductive flowmeter |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
R005 | Application deemed withdrawn due to failure to request examination |
Effective date: 20130806 |