DE3816623C1 - Vortex flowmeter - Google Patents
Vortex flowmeterInfo
- Publication number
- DE3816623C1 DE3816623C1 DE3816623A DE3816623A DE3816623C1 DE 3816623 C1 DE3816623 C1 DE 3816623C1 DE 3816623 A DE3816623 A DE 3816623A DE 3816623 A DE3816623 A DE 3816623A DE 3816623 C1 DE3816623 C1 DE 3816623C1
- Authority
- DE
- Germany
- Prior art keywords
- cylindrical section
- medium
- section
- signal
- radius
- 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.)
- Expired
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
- G01F1/32—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 using swirl flowmeters
- G01F1/3236—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 using swirl flowmeters using guide vanes as swirling means
-
- 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
- G01F1/32—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 using swirl flowmeters
- G01F1/325—Means for detecting quantities used as proxy variables for swirl
- G01F1/3259—Means for detecting quantities used as proxy variables for swirl for detecting fluid pressure oscillations
-
- 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
- G01F1/32—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 using swirl flowmeters
- G01F1/325—Means for detecting quantities used as proxy variables for swirl
- G01F1/3273—Means for detecting quantities used as proxy variables for swirl for detecting fluid speed oscillations by thermal sensors
-
- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Die Erfindung betrifft einen Dralldurchflußmesser nach dem Oberbegriff des Anspruchs 1.The invention relates to a swirl flow meter according to the Preamble of claim 1.
Bei einem nach der DE-PS 23 02 246 bekannten Dralldurch flußmesser dieser Art setzt die Auswertung voraus, daß der zweite zylindrische Abschnitt einen kleineren Durchmesser hat als der erste zylindrische Abschnitt. Der zweite zylin drische Abschnitt stellt daher einen zusätzlichen Strömungs widerstand für das Medium dar, der den Druckverlust durch den Dralldurchflußmesser heraufsetzt. Der zweite zylin drische Abschnitt ist überdies stromaufwärts des ersten zylindrischen Abschnitts als Kehle einer Düse ausgebildet, die die Bildung des präzedierenden Wirbelstroms im ersten zylindrischen Abschnitt stört und die Linearität der Meß ergebnisse beeinträchtigt.In a twist known from DE-PS 23 02 246 Flow meters of this type require the evaluation that the second cylindrical section a smaller diameter has as the first cylindrical section. The second cylin drische section therefore represents an additional flow resistance for the medium that represents the pressure drop through increases the swirl flow meter. The second cylin drische section is also upstream of the first cylindrical section formed as a throat of a nozzle, which is the formation of the precessing eddy current in the first cylindrical section interferes with the linearity of the measurement results affected.
Aufgabe der Erfindung ist es, eine besonders hohe Lineari tät der Meßergebnisse zu erzielen und dabei mit nur einer durch Messung zu ermittelnden Eichkonstanten auszukommen.The object of the invention is a particularly high lineari to achieve the measurement results with only one to get by using measurement constants to be determined.
Die Lösung dieser Aufgabe ist in Anspruch 1 angegeben.The solution to this problem is specified in claim 1.
Die in Anspruch 1 angegebenen Eichkonstanten C und c hängen zusammen. Es ist daher möglich, die eine Eichkon stante in die andere Eichkonstante umzurechnen.The calibration constants C and c specified in claim 1 are related. It is therefore possible to convert the one calibration constant into the other calibration constant.
Der Steigungswinkel α ist konstruktiv vorgegeben und dem Konstrukteur bekannt.The lead angle α is predetermined in the design and is known to the designer.
Der Kalibrierfaktor K gibt die Beziehung zwischen Volumen fluß und Präzessionsfrequenz an: Q = f/K. Er wird mit Hilfe einer Kalibrierung bestimmt, indem Q von einem Master be stimmt wird und die Frequenz gemessen wird. K ist dann der Mittelwert aus den Quotienten fi/Qi.The calibration factor K indicates the relationship between volume flow and precession frequency: Q = f / K. It is determined by means of a calibration, in which Q is determined by a master and the frequency is measured. K is then the mean of the quotients fi / Qi .
Einen besonders geringen Druckverlust behält man durch die an sich nach der DE-AS 19 04 435 bekannte Ausbildung gemäß Anspruch 2.One keeps a particularly low pressure loss through the known according to DE-AS 19 04 435 training according Claim 2.
Der Dralldurchflußmesser hat, wie nach der DE-AS 19 04 435 an sich bekannt, einen Stator, der den präzedierenden Wir belstrom erzeugt, und einen stromabwärts hiervon angeord neten Stator, der den Linearstrom erzeugt, in einer Anord nung nach Anspruch 3 oder nach Anspruch 4, wobei die An ordnung nach Anspruch 4 besonders lineare Meßergebnisse liefert.The swirl flow meter has, as in DE-AS 19 04 435 known per se, a stator that the precessing we generated belstrom, and arranged downstream thereof neten stator, which generates the linear current, in an arrangement nung according to claim 3 or claim 4, wherein the An order according to claim 4 particularly linear measurement results delivers.
Einen besonders einfachen Aufbau erhält man durch die ebenfalls nach der DE-AS 19 04 435 an sich bekannte Aus bildung nach Anspruch 5.A particularly simple structure is obtained through the also known from DE-AS 19 04 435 education according to claim 5.
Die Erfindung wird im folgenden an einem Ausführungsbeispiel unter Hinweis auf die beigefügte schematische Zeichnung eines Dralldurchflußmessers beschrieben.The invention is based on an embodiment with reference to the attached schematic drawing described a swirl flow meter.
Der Dralldurchflußmesser 1 nach dem Ausführungsbeispiel weist einen zentralen zylindrischen Abschnitt 4 auf, der sich stromaufwärts und stromabwärts etwas zu zylindrischen Abschnitten 5 und 7 erweitert, die in Flanschen 51 und 71 enden. In dem zylindrischen Abschnitt 5 befindet sich ein Stator 18 mit einem zentralen Kern 17, der beim Durchfluß eines Mediums in dem zylindrischen Abschnitt 4 einen prä zedierenden Wirbelstrom erzeugt. In dem Abschnitt 7 befin det sich ein Stator 20 mit einem zentralen Kern 19, der einerseits den präzedierenden Wirbelstrom im Abschnitt 4 stabilisiert und ihn andererseits stromabwärts in einen Laminarstrom umwandelt. Die Statoren 18 und 20 weisen in bekannter Weise gegensinnig gerichtete Schaufelkränze auf.The swirl flow meter 1 according to the exemplary embodiment has a central cylindrical section 4 , which widens somewhat upstream and downstream to cylindrical sections 5 and 7 , which end in flanges 51 and 71 . In the cylindrical section 5 there is a stator 18 with a central core 17 , which generates a precedent eddy current when a medium flows through the cylindrical section 4 . In section 7 is a stator 20 with a central core 19 which on the one hand stabilizes the precessing eddy current in section 4 and on the other hand converts it downstream into a laminar flow. The stators 18 and 20 have, in a known manner, vane rings directed in opposite directions.
Der zylindrische Abschnitt 4 weist im vorliegenden Ausfüh rungsbeispiel zwei als Sensoren dienende Öffnungen 2, 10 auf. Die Öffnung 10 erfaßt die Präzessionsfrequenz f des prä zedierenden Wirbelstroms als Druckschwankungen oder als Tempe raturschwankungen an einem Thermistor und gibt diese Druck schwankungen bzw. Temperaturschwankungen über eine Leitung 11 an einen Wandler 14, der diese Druckschwankungen in elektrische Signale auf einer Leitung 15 umsetzt. Die Öffnung 2 erfaßt den sta tischen Druck auf den Innenumfang des zylindrischen Ab schnitts 4 p W und leitet diesen Druck über eine Leitung 3 in einen Einlaß 13 eines Differenzdruckmessers 12.In the present exemplary embodiment, the cylindrical section 4 has two openings 2 , 10 serving as sensors. The opening 10 detects the precession frequency f of the preceding eddy current as pressure fluctuations or as temperature fluctuations on a thermistor and gives these pressure fluctuations or temperature fluctuations via a line 11 to a converter 14 which converts these pressure fluctuations into electrical signals on a line 15 . The opening 2 detects the static pressure on the inner circumference of the cylindrical section from 4 p W and passes this pressure via a line 3 into an inlet 13 of a differential pressure meter 12th
An den Flansch 71 ist eine Leitung 22 mit einem über ihre Länge konstanten Querschnitt mittels eines Flansches 72 an gesetzt. Durch diese Leitung 22 fließt wegen des Stators 20 ein Laminarstrom. Von einer Öffnung 6 in einem Abschnitt 8, der den zweiten zylindrischen Abschnitt im Sinne der Erfin dung bildet, führt eine Leitung 24 zu einem zweiten Eingang 21 des Differenzdruckmessers 12. Die Öffnung 6 erfaßt den statischen Druck p L des Mediums auf den Innenumfang des zweiten zylindrischen Abschnitts 8. Der Differenzdruckmes ser 12 gibt über eine Leitung 23 elektrische Signale ab, die der dem Differenzdruck Δ p = p W - p L entsprechen.On the flange 71 , a line 22 is set with a constant cross section over its length by means of a flange 72 . A laminar current flows through this line 22 because of the stator 20 . From an opening 6 in a section 8 , which forms the second cylindrical section in the sense of the inven tion, a line 24 leads to a second input 21 of the differential pressure meter 12th The opening 6 detects the static pressure p L of the medium on the inner circumference of the second cylindrical section 8 . The differential pressure meter 12 emits electrical signals via a line 23 which correspond to the differential pressure Δ p = p W - p L.
Die Leitungen 15, 23 führen in eine elektronische Einheit 16, die als Ausgangssignal über eine Leitung 25 ein elektri sches Signal M liefert, das dem Massenstrom des den Drall durchflußmesser 1 durchströmenden Mediums entspricht.The lines 15 , 23 lead into an electronic unit 16 , which delivers an electrical signal M as an output signal via a line 25 , which corresponds to the mass flow of the swirl flowmeter 1 flowing medium.
Wie in der DE-PS 23 02 246 angegeben, können die Öffnungen 2 und 10 übereinstimmen. Der Druck und die Drucköffnungen an dieser dann übereinstimmenden Öffnung werden nur getrennt in der beschriebenen Weise ausgewertet.As indicated in DE-PS 23 02 246, the openings 2 and 10 can match. The pressure and the pressure openings at this then matching opening are only evaluated separately in the manner described.
Der Durchmesser des ersten zylindrischen Abschnitts 4 ist 2 r W und der Durchmesser des zweiten zylindrischen Ab schnitts 8 ist 2 r L. Die Auswertung der Signale Δ p und f erfolgt so wie in An spruch 1 angegeben.The diameter of the first cylindrical portion 4 is 2 r W and the diameter of the second cylindrical portion 8 is 2 r L. The evaluation of the signals Δ p and f is carried out as specified in claim 1.
Claims (5)
dadurch gekennzeichnet,
daß die Auswertevorrichtung (12, 14, 16) aus der Differenz (Δ p) der von den Drucksensoren (2, 6) abgegebenen Signale (Pw, Pe) und dem von dem Präzessionsfrequenzsensor abge gebenen Signal (f) ein die Dichte des Mediums kennzeich nendes Signal (ϑ) nach der Formel ϑ = Δ p/f²Cermittelt, in der
C eine erste Eichkonstante ist
und daraus das den Massenstrom kennzeichnende Signal (M) nach der FormelM = ϑ 2π²r³ W fc/tg αermittelt, in der
r W der Radius des ersten zylindrischen Abschnitts (4) ist, tg α der Tangens des eine Apparatekonstante darstellen den Steigungswinkels α des Wirbelstroms im ersten zylindri schen Abschnitt (4) in bezug zur Achsrichtung des ersten zylindrischen Abschnitts (4) ist und
c eine zweite Eichkonstante ist, wobei die Auswertevor richtung (12, 14, 16) die erste Eichkonstante C aus der zweiten Eichkonstanten c - oder umgekehrt - nach der FormelC = 2π²r² W c - 1/2K²π²(1/r⁴ W - 1/r L⁴)ermittelt, in der K ein empirisch zu ermittelnder Kalibrierfaktor ist,
r L der Radius des zweiten zylindrischen Abschnitts (8) ist. 1. Swirl flow meter for measuring the mass flow of a flowable medium with a first pressure sensor (2nd) on a first cylindrical section (4th), by the the medium flows in a precessing eddy current, with a second pressure sensor (6) on a second cylinder third section (8th), through which the medium in one Laminar current flows, with a precession frequency sensor (10th) on the first cylindrical section (4th) and with one of the pressure sensors (2, 6) and the precise ion frequency sensor (10th) controlled evaluation device (12, 14, 16) that know the mass flow of the medium emits a drawing signal,
characterized,
that the evaluation device (12, 14, 16) from the difference (Δ p) from the pressure sensors (2, 6) emitted signals (Pw, Pe) and that of the precession frequency sensor given signal (f) indicates the density of the medium signal (ϑ) according to the formula ϑ =Δ p / f²C.determined in the
C. is a first calibration constant
and from this the signal characterizing the mass flow (M) according to the formulaM =ϑ 2ndπ²r³ W fc / tg αdetermined in the
r W the radius of the first cylindrical section (4th) is daily α the tangent of represent an apparatus constant the pitch angleα of the eddy current in the first cylinder section (4th) with respect to the axial direction of the first cylindrical section (4th) is and
c is a second calibration constant, the evaluations direction (12, 14, 16) the first calibration constantC. from the second calibration constantc - or vice versa - according to the formulaC. = 2π²r² W c - 1/2K²π² (1 /r⁴ W - 1/r L⁴) determined in the K is a calibration factor to be determined empirically,
r L the radius of the second cylindrical section (8th) is.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3816623A DE3816623C1 (en) | 1988-05-16 | 1988-05-16 | Vortex flowmeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3816623A DE3816623C1 (en) | 1988-05-16 | 1988-05-16 | Vortex flowmeter |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3816623C1 true DE3816623C1 (en) | 1989-11-23 |
Family
ID=6354458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3816623A Expired DE3816623C1 (en) | 1988-05-16 | 1988-05-16 | Vortex flowmeter |
Country Status (1)
Country | Link |
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DE (1) | DE3816623C1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0579493A2 (en) * | 1992-07-15 | 1994-01-19 | Abb K-Flow Inc. | Fluid mass flow meters |
DE19546214A1 (en) * | 1994-12-02 | 1996-06-13 | Peter Ing Klementschitz | Apparatus for determination of fluid flow in piped gas or liquid |
DE19535486C1 (en) * | 1995-09-23 | 1996-12-05 | Bayerische Motoren Werke Ag | Flow spin measurement method for simulated combustion chamber of piston engine |
DE19633416A1 (en) * | 1996-08-20 | 1997-04-03 | Merkel Wolfgang | Vol. flow and density measurement device for gases and liquids |
DE19619632A1 (en) * | 1996-05-15 | 1997-11-20 | S K I Schlegel & Kremer Indust | Measuring density of flowing fluid using at least two measuring points |
DE10035998A1 (en) * | 2000-07-25 | 2002-02-07 | Kraeutler Ges M B H & Co | Device for determining the mass flow of liquids |
DE10240189A1 (en) * | 2002-08-28 | 2004-03-04 | Endress + Hauser Flowtec Ag, Reinach | Mass flow measuring method for fluid in pipe, by setting up Karman vortices and determining pressure value representing time-averaged mean dynamic pressure, and flow value |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1906893A1 (en) * | 1969-02-12 | 1970-09-03 | Fischer & Porter Gmbh | Tubular swirl flow meter |
GB1211931A (en) * | 1967-01-30 | 1970-11-11 | Exxon Research Engineering Co | Modified turbine mass flow meter |
DE1904435B2 (en) * | 1969-01-30 | 1971-11-25 | Fischer & Porter Gmbh, 3401 Gross Ellershausen | TUBULAR SWIRL FLOW METER |
DE2302246C3 (en) * | 1973-01-18 | 1978-06-08 | Fischer & Porter Gmbh, 3400 Goettingen | Swirl flow meter for measuring the mass flow of a gaseous or liquid medium |
CH615506A5 (en) * | 1976-02-11 | 1980-01-31 | Itt |
-
1988
- 1988-05-16 DE DE3816623A patent/DE3816623C1/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1211931A (en) * | 1967-01-30 | 1970-11-11 | Exxon Research Engineering Co | Modified turbine mass flow meter |
DE1904435B2 (en) * | 1969-01-30 | 1971-11-25 | Fischer & Porter Gmbh, 3401 Gross Ellershausen | TUBULAR SWIRL FLOW METER |
DE1906893A1 (en) * | 1969-02-12 | 1970-09-03 | Fischer & Porter Gmbh | Tubular swirl flow meter |
DE2302246C3 (en) * | 1973-01-18 | 1978-06-08 | Fischer & Porter Gmbh, 3400 Goettingen | Swirl flow meter for measuring the mass flow of a gaseous or liquid medium |
CH615506A5 (en) * | 1976-02-11 | 1980-01-31 | Itt |
Non-Patent Citations (1)
Title |
---|
JP 62 140025 A. In: Patents Abstracts of Japan, P-642, December 3, 1987, Vol. 11, No. 370 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0579493A2 (en) * | 1992-07-15 | 1994-01-19 | Abb K-Flow Inc. | Fluid mass flow meters |
EP0579493A3 (en) * | 1992-07-15 | 1995-09-06 | Abb K Flow Inc | Fluid mass flow meters |
US5458005A (en) * | 1992-07-15 | 1995-10-17 | Abbk-Flow Inc. | Fluid mass flow meters |
DE19546214A1 (en) * | 1994-12-02 | 1996-06-13 | Peter Ing Klementschitz | Apparatus for determination of fluid flow in piped gas or liquid |
DE19546214C2 (en) * | 1994-12-02 | 2001-09-27 | Peter Klementschitz | Device for mass flow measurement |
DE19535486C1 (en) * | 1995-09-23 | 1996-12-05 | Bayerische Motoren Werke Ag | Flow spin measurement method for simulated combustion chamber of piston engine |
DE19619632A1 (en) * | 1996-05-15 | 1997-11-20 | S K I Schlegel & Kremer Indust | Measuring density of flowing fluid using at least two measuring points |
DE19633416A1 (en) * | 1996-08-20 | 1997-04-03 | Merkel Wolfgang | Vol. flow and density measurement device for gases and liquids |
DE19633416C2 (en) * | 1996-08-20 | 1999-09-23 | Wolfgang Merkel | Volume flow and density meter VD 1 |
DE10035998A1 (en) * | 2000-07-25 | 2002-02-07 | Kraeutler Ges M B H & Co | Device for determining the mass flow of liquids |
DE10240189A1 (en) * | 2002-08-28 | 2004-03-04 | Endress + Hauser Flowtec Ag, Reinach | Mass flow measuring method for fluid in pipe, by setting up Karman vortices and determining pressure value representing time-averaged mean dynamic pressure, and flow value |
US7007556B2 (en) | 2002-08-28 | 2006-03-07 | Endress + Hauser Flowtec Ag | Method for determining a mass flow of a fluid flowing in a pipe |
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