DE1943021A1 - Device for measuring the flow according to the differential pressure method - Google Patents
Device for measuring the flow according to the differential pressure methodInfo
- Publication number
- DE1943021A1 DE1943021A1 DE19691943021 DE1943021A DE1943021A1 DE 1943021 A1 DE1943021 A1 DE 1943021A1 DE 19691943021 DE19691943021 DE 19691943021 DE 1943021 A DE1943021 A DE 1943021A DE 1943021 A1 DE1943021 A1 DE 1943021A1
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- strain
- membrane
- rigid
- orifice
- 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.)
- Pending
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
- G01F1/05—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 mechanical effects
- G01F1/20—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 mechanical effects by detection of dynamic effects of the flow
- G01F1/28—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 mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
-
- 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
- G01F1/05—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 mechanical effects
- G01F1/34—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 mechanical effects by measuring pressure or differential pressure
- G01F1/36—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 mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/38—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 mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule
- G01F1/383—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 mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule with electrical or electro-mechanical indication
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Measuring Fluid Pressure (AREA)
Description
Einrichtung zur Messung des Durchflusses nach dem Wirkdruckverfahren Die Erfindung betrifft eine Einrichtung zur Messung des Durch flusses nach dem Wirkdruckverfahren. Es ist bekannt, den an einer Blende in einer Rohrleitung auftretenden Wirkdruckv der der Differenz der vor und hinter der 31 ende herrschenden Drücke entspricht einer Einrichtung zuzuführen, die diesen Differenzdruck in ein elektrisches oder pneumatisches Signal umsetzt.Device for measuring the flow according to the differential pressure method The invention relates to a device for measuring the flow according to the differential pressure method. It is known that the differential pressure occurring at an orifice in a pipeline which corresponds to the difference between the pressures in front of and behind the 31 end to supply a device that converts this differential pressure into an electrical or converts the pneumatic signal.
Derartige Einrichtungen werden normalerweise außerhalb des Rohres angebracht, in dem sich die Meßblende befindet. Die Verbindung zu der Einrichtung wird durch zwei Druckleitungen hergestellt, die vor und nach der Blende in der Rohrwand angebracht sind und in die Druckkammern der Meßeinrichtung münden.Such facilities are usually outside the pipe attached, in which the measuring orifice is located. The connection to the facility is made by two pressure lines, which are before and after the orifice in the pipe wall are attached and open into the pressure chambers of the measuring device.
Wird eine der beiden Verbindungleitungen leck, dann wird die Meßeinrichtung einseitig mit den vollen statischen Druck belastet. Um es bein Auftreten einer olchen Überbelastung nicht zur Zerstörung der Meßeinrichtung kommen zu lassen, ist diese üblicherweise mit aufwendigen Vorrichtungen versehen, die den Überdruck nicht zur vollen Wirkung auf die Meßeinrichtung konmen lassen.If one of the two connecting lines leaks, the measuring device loaded on one side with the full static pressure. To it with the appearance of an olchen It is essential to avoid overloading the measuring device usually provided with complex devices that do not use the overpressure allow full effect on the measuring device.
Es besteht die Aufgabe, eine Einrichtung zur Messung des Durchflusses nach dem Wirkdruckverfahren zu echaffen, bei der die Gefahr des Leckwerdens der Zuleitung und des Auftretens einer schädlichen überlast in der Meßeinrichtung selbst vermieden wird und die möglichst einfach aufgebaut ist.The task is to create a device for measuring the flow to be created according to the differential pressure method, in which there is a risk of leakage Supply line and the occurrence of a harmful overload in the measuring device itself is avoided and which is as simple as possible.
Eihe Lösung der Aufgabe stellt eine Einrichtung genuß der Erfindung dar, die dadurch gekennzeichnet ist, daß an der Meßblende Dehnungsfühler angebracht sind, weiche die von Wirkdruck anhängige elastische Verform,ung der Meßblende oder cn Teilen davon in ein elektrisches Signal unwandeln. Mit einer derartigen Anordnung, bei der die Meßfühler direkt an der Meßblende in Rohr angebracht sind, fallen die eingangs geschilderten Überlastprobleme fort.The solution to the problem is a device enjoying the invention which is characterized in that strain sensors are attached to the measuring orifice are, soft the elastic deformation dependent on the differential pressure, ung the measuring orifice or cn convert parts of it into an electrical signal. With such an arrangement, where the sensors are attached directly to the measuring orifice in a pipe, the overload problems described at the beginning.
Zur Erläuterung der Erfindung sind in den Figuren mehrere Ausführungsbeispiele dargestellt und in folgenden beschrieben.Several exemplary embodiments are shown in the figures to explain the invention and described in the following.
Figur 1 In einen Rohr 1 fließt.das Meßmedium Q in Pfeilrichtung. In den Rohr ist eine 1?.eßblende 2 angebracht. Vor der Meßblende herrscht der Druck p 1, hinter der Meßblende der Druck p 2. Unter der Wirkung des Differenzdrucks p p = p 1 - p 2 unterliegt die Meßblende 2 einer elastischen Verformung. Das Ziel der Erfindung ist, diese elastische Verformung der Meßblende 2 als eine von Wirkdruck abhängige Größe in ein elektrisches Signal umzuwandeln. Zu diesen Zwecke ind iu dem Beispiel die I)ehnungsmeßstreifen 3 und 3 auf der Meß- blcnde 2 befestigt. Ihre Anschlüsse führen durch die Durchführungen 4 und 4' aus dem Rohr heraus und sind in hier nicht dargestellter, bekannter Weise mit einer Brückenschaltung verbunden, in der das elektrische Signal abgenommen werden kann.Figure 1 The measuring medium Q flows into a pipe 1 in the direction of the arrow. In The tube is attached to a 1 measuring diaphragm 2. The pressure prevails in front of the measuring orifice p 1, behind the measuring orifice the pressure p 2. Under the effect of the differential pressure p p = p 1 - p 2, the measuring orifice 2 is subject to elastic deformation. The goal of the invention is this elastic deformation of the measuring orifice 2 as one of differential pressure convert the dependent variable into an electrical signal. For these purposes ind iu the example, the measuring strips 3 and 3 on the measuring blinding 2 attached. Your connections lead through the bushings 4 and 4 'out of the pipe out and are in a known manner not shown here with a bridge circuit connected, in which the electrical signal can be picked up.
Material und Dicke der Meßblende 2 sind so zu wählen, daP unter der Wirkung des Differenzdrucks eine meßbare Verformung auftritt. Eine Verstärkung des Meßeffekts tritt dann cin, wenn die Meßblende 2 als flache oder gewellte, kreisringförmige Membran ausgeführt ist.The material and thickness of the measuring orifice 2 are to be selected so that the Effect of the differential pressure a measurable deformation occurs. A reinforcement of the The measuring effect occurs when the measuring diaphragm 2 is flat or corrugated, circular ring-shaped Membrane is executed.
Figur 2: In dem Rohr 1 ist eine Meßblende 2-angebtacht, die aus einer starren Lochscheibe 5 mit der eigentlichen Belndenöffnung und einer kreisringförmigen Membran 6 besteht, mit der diese starre Lochscheibe 5 mit er Wand des Rohrs 1 verbunden ist. Der an er Meßblende auftretende Druck bewirkt eine Auslenkung der starren Lochscheibe 5 in Strömungsrichtung.Figure 2: In the tube 1 is a measuring orifice 2-attached, which consists of a rigid perforated disk 5 with the actual belden opening and a circular ring-shaped Membrane 6 is made with which this rigid perforated disk 5 is connected to the wall of the tube 1 is. The pressure occurring at the measuring orifice causes the rigid perforated disc to deflect 5 in the direction of flow.
Dicsc Auslenkung kann mittels eincs kraftschlüssig mit der starren Lochscheibe 5 verbundenen Dehnungsfühlers 7, der aus dem Biegebalken 8 und darauf befestigten Dehnungsmeßstreiffen 3 und 3' besteht, in ein elektrisches Signal umgewandelt werden. Un eine statisch bestimmte Abstützung der Meßblende zu erreichen und ein einseitiges Ausknicken zu vermeiden, ist es von Vorteil, mehrere derartige Dehnungsfühler in gleichen Abständen über den Rohrunfeng verteilt i.iit der Lochscheibe 5 ru verbinden. Anstelle der Dehnungsfühler 7 können auch Dehnungsmeßstraifen treten, die direkt auf die kreisringförmige Membran 6 aufgebracht werden.The deflection can be frictionally engaged with the rigid Orifice plate 5 connected strain sensor 7, which consists of the bending beam 8 and on it attached strain gauges 3 and 3 'is converted into an electrical signal will. Un to achieve a statically determined support of the orifice plate and a To avoid buckling on one side, it is advantageous to have several such strain sensors Distributed at equal intervals over the pipe connection i.iit the perforated disc 5 ru. Instead of the strain sensor 7, strain gauges can also be used directly be applied to the annular membrane 6.
Figur 3: Strömen in dem Rohr 1 aggressive Lledien, welche die Dehnungsfühler angreifen, so können diese innerhalb zweier parallel angeordneter Kreisringnembranen 6 und 6' eingeordnet werden. Diese beiden Kreisringmembranen 6 und 6' sind einerseits mit der Rohrwand, andererseits mit den Rand einer starten Lochscheibe 5 verbunden, wie bereits in Figur 2 dargestellt.Figure 3: Flow in the pipe 1 aggressive lines, which the strain sensors attack, they can attack within two parallel annular membranes 6 and 6 'can be classified. These two annular diaphragms 6 and 6 'are on the one hand connected to the pipe wall, on the other hand with the edge of a start perforated disk 5, as already shown in FIG.
Die Dehnungsmeßstreifen, können innerhalb an den Membranen angebracht worden oder wie in Figur 3 dargestellt, an einen 3iegebalken 8, vielcher einerseits mit der Rohrwand 1 , andererseits kraftscllltissig mit dem Rand der Lochscheibe 5 verbunden ist. Der aus den Kreisringmembranen 6, 6', der Rohrwand und dem Rand der Lochscheibe 5 gebildete Raum, in welchem die Dehnungsfühler angeordnet sind, kann auch mit einer Schutzflüssigkeit 9 gefüllt werden.The strain gauges can be inside on the membranes appropriate been or as shown in Figure 3, on a 3iegebeber 8, many on the one hand with the pipe wall 1, on the other hand forcefully with the edge of the perforated disc 5 is connected. The one from the annular diaphragms 6, 6 ', the pipe wall and the edge the space formed by the perforated disk 5 in which the strain sensors are arranged, can also be filled with a protective liquid 9.
Figur 4: In dem Rohr 1 ist eine Meßblende 2 angeordnet, die außer der eigentlichen Blendenöffnung 10 mindestens eine weitere Öffnung 11 aufweist, deren Achse parallel zu der Achse der Iteßöffnung 10 ist. Diese Öffnung 11 ist mit einer Membran oder mit einem Faltenbalg 12 verschlossen. Dieser Faltenbalg ist wiederum kraftschlüssig mit einem Dehnungsfühler 7, der aus dem Biegebalken 8 und Dehnungsmeßstreifen 3 und 3' besteht, verbunden.Figure 4: In the tube 1, a measuring orifice 2 is arranged, which except the actual aperture 10 has at least one further opening 11, whose axis is parallel to the axis of the inlet opening 10. This opening 11 is with a membrane or closed with a bellows 12. This bellows is in turn frictionally with a strain sensor 7, which consists of the bending beam 8 and strain gauges 3 and 3 'is connected.
Für aIle Ausführungsbeispiele gilt, daß die Biegebalken 8 der Dehnungsfühler 7 so ausgebildet sind, daß ein bestimmter mechanisch elektrischer Funktionszusammenhang zwischen dem Differenzdruck # p und dem elektrischen Signal herzustellen ist. Dies kann durch eine bestimmte Formgebung der Dehnungsfühier bewerkstelligt werden. Soll beispielsweise das elektrische Signal proportional dem Durchfluß sein, so int die Ausführung dergestalt zu treffen, daß die Funktion A = # # p nachgebildet werden kann. Die nicht geschützten Dehnungsfühler der Ausführungsformen in Figur 1, Figur 2, Figur 4 sind vorzugsweise auf der der Strömung abgewandten Seite der Ileßblende anzubringen Zur Nullpunktkontrolle der Meßeinrichtung ist es von Vorteil, die Meßblende mittels eines Bypass-Ventils druckfrei machen zu können.For all the exemplary embodiments, the bending beams 8 are the strain sensors 7 are designed so that a certain mechanical electrical functional relationship is to be established between the differential pressure # p and the electrical signal. this can be achieved by a certain shape of the expansion guide. Intended to for example, the electrical signal may be proportional to the flow rate, so int the Execution to be made in such a way that the function A = # # p are simulated can. The unprotected strain sensors of the embodiments in Figure 1, Figure 2, FIG. 4 are preferably on the side of the Ileßblende facing away from the flow to be attached To check the zero point of the measuring device, it is advantageous to use the measuring orifice to be able to depressurize by means of a bypass valve.
9 Patentansprüche 1 Bl. Zeichnungen9 claims 1 sheet of drawings
Claims (9)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1347368 | 1968-09-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE1943021A1 true DE1943021A1 (en) | 1970-03-19 |
DE1943021B2 DE1943021B2 (en) | 1971-06-24 |
Family
ID=4392743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19691943021 Pending DE1943021B2 (en) | 1968-09-09 | 1969-08-23 | DEVICE FOR MEASURING THE FLOW ACCORDING TO THE EFFECTIVE PRESSURE METHOD |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1943021B2 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2802830A1 (en) * | 1978-01-23 | 1979-07-26 | Gerhard Dr Ing Mueller | Measurement of fluid or gas flow speed - involves using measurement of resultant sheet or diaphragm deformation or deflection |
DE19758462C2 (en) * | 1997-04-22 | 2000-11-30 | Fraunhofer Ges Forschung | Dosing device element |
WO2010087917A1 (en) * | 2009-01-28 | 2010-08-05 | American Power Conversion Corporation | Method and system for detecting air pressure neutrality in air containment zones |
ITPI20100145A1 (en) * | 2010-12-31 | 2012-07-01 | Acque Ingegneria | DEVICE FOR MEASURING THE FLOW OF A FLUID |
US8407004B2 (en) | 2010-04-29 | 2013-03-26 | Schneider Electric It Corporation | Airflow detector and method of measuring airflow |
US8534119B2 (en) | 2010-12-30 | 2013-09-17 | Schneider Electric It Corporation | System and method for air containment zone air leakage detection |
DE102014110556B3 (en) * | 2014-07-25 | 2015-09-03 | Sick Engineering Gmbh | Device for flow measurement |
CN108458756A (en) * | 2017-02-22 | 2018-08-28 | 西门子公司 | Flow measurement device and measured value route marker for process instrument |
EP4310474A1 (en) | 2022-07-20 | 2024-01-24 | Judo Wasseraufbereitung GmbH | Leakage protection for detecting large and small leaks |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3221530A1 (en) * | 1982-06-08 | 1983-12-08 | Roland 8600 Dübendorf Bucher | Speed indicator for a liquid or gaseous medium |
DE19716897C1 (en) * | 1997-04-22 | 1998-11-26 | Fraunhofer Ges Forschung | Dosing unit for fluids |
-
1969
- 1969-08-23 DE DE19691943021 patent/DE1943021B2/en active Pending
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2802830A1 (en) * | 1978-01-23 | 1979-07-26 | Gerhard Dr Ing Mueller | Measurement of fluid or gas flow speed - involves using measurement of resultant sheet or diaphragm deformation or deflection |
DE19758462C2 (en) * | 1997-04-22 | 2000-11-30 | Fraunhofer Ges Forschung | Dosing device element |
DE19758463C2 (en) * | 1997-04-22 | 2000-12-07 | Fraunhofer Ges Forschung | Dosing device |
US6253605B1 (en) | 1997-04-22 | 2001-07-03 | Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. | Semiconductive flow proportioner |
US6443014B1 (en) | 1997-04-22 | 2002-09-03 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E. V. | Proportioner |
WO2010087917A1 (en) * | 2009-01-28 | 2010-08-05 | American Power Conversion Corporation | Method and system for detecting air pressure neutrality in air containment zones |
US7861596B2 (en) | 2009-01-28 | 2011-01-04 | American Power Conversion Corporation | Method and system for detecting air pressure neutrality in air containment zones |
CN102365529A (en) * | 2009-01-28 | 2012-02-29 | 美国能量变换公司 | Method and system for detecting air pressure neutrality in air containment zones |
AU2009338700B2 (en) * | 2009-01-28 | 2014-04-17 | Schneider Electric It Corporation | Method and system for detecting air pressure neutrality in air containment zones |
CN102365529B (en) * | 2009-01-28 | 2013-05-08 | 美国能量变换公司 | Method and system for detecting air pressure neutrality in air containment zones |
US8407004B2 (en) | 2010-04-29 | 2013-03-26 | Schneider Electric It Corporation | Airflow detector and method of measuring airflow |
US8534119B2 (en) | 2010-12-30 | 2013-09-17 | Schneider Electric It Corporation | System and method for air containment zone air leakage detection |
US9274019B2 (en) | 2010-12-30 | 2016-03-01 | Schneider Electric It Corporation | System and method for air containment zone air leakage detection |
WO2012101490A3 (en) * | 2010-12-31 | 2012-11-15 | Ingegnerie Toscane S.R.L. | Device for measuring the flow rate of a fluid |
ITPI20100145A1 (en) * | 2010-12-31 | 2012-07-01 | Acque Ingegneria | DEVICE FOR MEASURING THE FLOW OF A FLUID |
US9377335B2 (en) | 2010-12-31 | 2016-06-28 | Ingegnerie Toscane S.R.L. | Flow rate sensor probe having contactless force trasnmitting structure |
DE102014110556B3 (en) * | 2014-07-25 | 2015-09-03 | Sick Engineering Gmbh | Device for flow measurement |
CN108458756A (en) * | 2017-02-22 | 2018-08-28 | 西门子公司 | Flow measurement device and measured value route marker for process instrument |
DE102017202896B4 (en) | 2017-02-22 | 2019-10-10 | Siemens Aktiengesellschaft | Flow measuring device and transmitter for process instrumentation with such a flow measuring device |
US10571317B2 (en) | 2017-02-22 | 2020-02-25 | Siemens Aktiengesellschaft | Flow measurement arrangement including a flow tube and an elastically deformable orifice plate with strain sensors |
EP4310474A1 (en) | 2022-07-20 | 2024-01-24 | Judo Wasseraufbereitung GmbH | Leakage protection for detecting large and small leaks |
Also Published As
Publication number | Publication date |
---|---|
DE1943021B2 (en) | 1971-06-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0210523B1 (en) | Device for measuring pressure, normal force and bending on canalisations | |
DE1943021A1 (en) | Device for measuring the flow according to the differential pressure method | |
DE102015216626A1 (en) | Pressure sensor arrangement and transmitter for process instrumentation with such a pressure sensor arrangement | |
DE2935476B2 (en) | Liquid-filled differential pressure transducer | |
EP0288827A2 (en) | Device for measuring pressures | |
DE1473689A1 (en) | Electrical pressure transducer | |
CH690380A5 (en) | Libra. | |
DE102017202896B4 (en) | Flow measuring device and transmitter for process instrumentation with such a flow measuring device | |
EP0299282B1 (en) | Method and set-up for testing the functioning of a load suspension device | |
DE1812548C3 (en) | Pressure indicator | |
EP0762095B1 (en) | Yarn tension measuring sensor with moving coil transducer with support body for the diaphragm | |
DE2401357A1 (en) | HOUSING FOR A PRESSURE INDICATOR WITH OVERPRESSURE SAFETY | |
DE2904844C3 (en) | Pressure measuring device for measuring and monitoring concrete stresses | |
DE3004031C2 (en) | Pressure transducer | |
DE102014009003A1 (en) | Device for the parallel detection of motion and gravitational acceleration | |
DE3143061C2 (en) | Procedure for the individual measurement of the length of the pull rod and the segment lever of a pressure gauge | |
Ylinen et al. | A beam on a Wieghardt-type elastic foundation | |
DE3312385A1 (en) | Pressure-measuring arrangement | |
AT523702B1 (en) | load cell | |
DE2429137A1 (en) | PNEUMATIC SENSOR FOR THERMAL CHARACTERISTICS | |
DE2728720C2 (en) | ||
DE2906170C2 (en) | Extensometer for rock and soil mechanics | |
DE3837624A1 (en) | Device for the measurement of pressure changes | |
DE2247453C3 (en) | Device for measuring differential pressures in water and wastewater purification systems, in dam-generating facilities with an upper and lower water side | |
DE1807683A1 (en) | Barometer box |