WO1997008516A1 - Volumendurchflussmessgerät - Google Patents
Volumendurchflussmessgerät Download PDFInfo
- Publication number
- WO1997008516A1 WO1997008516A1 PCT/EP1996/003670 EP9603670W WO9708516A1 WO 1997008516 A1 WO1997008516 A1 WO 1997008516A1 EP 9603670 W EP9603670 W EP 9603670W WO 9708516 A1 WO9708516 A1 WO 9708516A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ultrasonic
- volume flow
- ultrasound
- flowing medium
- flow meter
- Prior art date
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
- G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02836—Flow rate, liquid level
Definitions
- the invention relates to a volume flow meter for flowing media, which works according to the transit time principle, with a line measuring section guiding the flowing medium, with two ultrasound signals emitting into the flowing medium and / or receiving from the flowing medium, arranged on opposite ends of the line measuring section Ultrasound transducers and with a control and evaluation circuit, the control and evaluation circuit measuring the transit time of the ultrasound signals between the ultrasound transducers to determine the volume flow through the line measuring section.
- the invention is therefore based on the object of further developing and developing the known volume flow meters in such a way that they can also be used at high temperatures of the flowing medium and have excellent measuring accuracy.
- the volume flow measuring device for flowing media which works according to the transit time principle in which the previously derived and shown task is solved, is characterized in that the ultrasonic transducers couple the ultrasonic signals into the flowing medium via heat-insulating ultrasonic waveguides.
- the measure according to the invention ensures that the high to very high temperatures prevailing in the flowing medium due to the
- REPLACEMENT BLA ⁇ (RULE 26) by far between the flowing medium and the ultrasonic transducers arranged heat-insulating ultrasonic waveguide on the ultrasonic transducer.
- the heat-insulating ultrasound waveguide temperatures of up to 1000 ° C. for the flowing medium are possible, for example, without affecting the conventionally — and thus inexpensively — constructed ultrasound transducers.
- the volume flow meter according to the invention experiences a first advantageous embodiment in that the ultrasonic waveguides are rod-shaped.
- the rod-shaped design of the ultrasound waveguide ensures that materials with higher heat conduction coefficients, but with other material parameters which are better, in particular with regard to the required ultrasound waveguide properties, can also be used as the starting material for producing the ultrasound waveguide.
- a particularly large difference between the temperature of the flowing medium and the temperature of the ultrasonic transducers can be ensured in the volume flow measuring device according to the invention in that a cooling device is provided for cooling the ultrasonic waveguide.
- a cooling device is provided for cooling the ultrasonic waveguide.
- active cooling devices e.g. B. a water or air cooling, but also passive cooling devices.
- the volume flow meter according to the invention is particularly advantageous in that the ultrasonic waveguides are each provided with at least one cooling fin.
- This passive cooling device is particularly advantageous because it does not require any further installation outlay and is extremely susceptible to faults.
- ultrasonic waveguides from stainless steel.
- Ultrasonic waveguides produced in this way are inexpensive, have a relatively low coefficient of thermal conductivity and have good ultrasonic waveguide properties.
- the inventive design of the known volume flow meters makes it necessary to modify the method for determining the volume flow according to the transit time principle, which can be used in a volume flow meter designed according to the invention.
- the method for determining the volume flow according to the transit time principle is advantageously designed such that the control and evaluation circuit uses the difference between the total transit time of the ultrasonic signals between the ultrasonic transducers and the sum of the transit times of the ultrasonic signals in the
- the volume flow rate is determined using ultrasound waveguides. Failure to consider the transit times of the ultrasonic signals in the ultrasonic waveguides would lead to a relatively large error in the measurement result for the volume flow. This is avoided by the described design of the method for determining the volume flow.
- the transit time of the ultrasonic signals in the ultrasonic waveguides can now be determined, for example, as part of a calibration process and transferred to the control and evaluation circuit as a fixed value.
- the method is particularly advantageous in that the control and evaluation circuit determines the transit time of the ultrasound signals in the ultrasound waveguides from the portions of the ultrasound signals reflected at the ends of the ultrasound waveguide facing the flowing medium. This ensures that the actual, temperature-dependent propagation time of the ultrasonic signals in the ultrasonic waveguides is always used for correction. In comparison to a determination of the transit time of the ultrasound signals in the ultrasound waveguides only once, this measure results in an improvement of the measurement accuracy from approx. ⁇ 4% to approx. 0.2%.
- a further increase in the measuring accuracy is ensured by the fact that the temperature of the flowing medium is determined by the control and evaluation circuit from the running time of the ultrasonic signals in the ultrasonic waveguides, and that the control and evaluation circuit determines the temperature based on the temperature of the flowing medium Result for volume flow is corrected. Because the term of the ultrasound signals in the ultrasound waveguides is a direct measure of the temperature of the ultrasound waveguides, the running time of the ultrasound signals in the ultrasound waveguides can also be used to infer the temperature of the flowing medium. The temperature of the flowing medium now has a significant influence on the measuring accuracy of the volume flow measuring device. Depending on the temperature, the pipe diameter of the pipe measuring section changes, for example.
- 1 is a schematic representation of a known volumetric flow meter for flowing media, which works on the runtime principle
- Fig. 2 is a schematic representation of a designed according to the invention
- 3 shows a section through an exemplary embodiment of an ultrasonic waveguide provided according to the invention
- 4 shows a diagram which shows the dependence of the temperature of the ultrasound transducer on the temperature of the flowing medium in a volume flow measuring device designed according to the invention
- FIG. 5 shows a diagram which shows the dependence of the transit times of an ultrasound signal in an ultrasound waveguide on the temperature in question
- FIG. 6 shows a diagram which shows the dependence of the speed of propagation of an ultrasound signal in an ultrasound waveguide on the temperature of the flowing medium.
- Fig. 1 shows a volume flow meter for flowing media, which works on the runtime principle.
- the volume flow meter has a line measuring section 1 guiding the flowing medium.
- Two ultrasound transducers 2, 3 emitting and / or receiving from the flowing medium.
- a control and evaluation circuit which measures the transit time of the ultrasound signals between the ultrasound transducers 2, 3 for determining the volume flow through the line measuring section 1.
- the line measuring section 1 shown in FIG. 1 either represents an independent part within a line system or it is formed by part of an existing line system
- the known volume measuring devices are generally designed such that the measuring line 4 forming the connecting line of the ultrasonic transducers 2, 3 intersects the longitudinal axis 5 of the line measuring section 1 at an angle ⁇ .
- the angle ⁇ is up to 0 °.
- REPLACEMENT BLA ⁇ (RULE 26) In order to ensure an intensive ultrasound signal at the received ultrasound transducer 2, 3, it makes sense for the ultrasound transducers 2, 3 to be aligned with one another.
- Both ultrasound transducers 2, 3 are now controlled by the control and evaluation circuit in such a way that one ultrasound transducer 2, 3 each emits ultrasound signals that are received by the other ultrasound transducer 3, 2. If the propagation speed c 0 of the ultrasound signals in the flowing medium is not known, it is necessary that the ultrasound transducers 2, 3 are actuated alternately as transmitters and receivers. The run times between the ultrasound transducers 2, 3 thus result
- L represents the distance between the two ultrasound transducers 2, 3 and V m the mean speed of the flowing medium in the line measuring section 1.
- the mean speed V m of the flowing medium which is different from zero, means the transit time Ti of the ultrasound signal from the ultrasound transducer 2 to the ultrasound transducer 3 less than the reverse time T2 from ultrasound transducer 3 to ultrasound transducer 2.
- ERSATZBU ⁇ (RULE 26) 2 of the drawing shows a volume flow meter designed according to the invention.
- This volume flow meter differs from the known ones in that the ultrasonic transducers 2, 3 are not arranged in direct contact with the flowing medium.
- 2 schematically shows that the ultrasonic transducers 2, 3 couple the ultrasonic signals into the flowing medium via heat-insulating ultrasonic waveguides 6, 7.
- FIG. 2 in conjunction with equations 1 and 2 show that the transit times of the ultrasound signals in the ultrasound waveguides 6, 7 have to be taken into account before determining the volume flow.
- FIG. 2 of the drawing it is also indicated for the ultrasound waveguide 6 that a portion of the ultrasound signals is reflected at the ends of the ultrasound waveguides 6, 7 facing the flowing medium. This portion can be changed by special designs of the ultrasound waveguide 6, 7.
- FIG. 3 now shows a section through an exemplary embodiment of a rod-shaped ultrasound waveguide 8.
- This rod-shaped ultrasound waveguide 8 is in communication with the flowing medium at its first end 9 and in contact with one of the ultrasound transducers 2, 3 at its second end 10.
- the advantage of the rod-shaped ultrasound waveguide 8 according to the invention results from the heat-insulating properties of the insulation section 12 arranged between the second end 10 and the mounting flange 11.
- This insulation section 12 can, for example, also be provided with one or more cooling fins and is preferably made of stainless steel, - However, for example, ceramic or plastic is also conceivable as a starting material for the ultrasound waveguide 8.
- FIG. 4 of the drawing shows a diagram of the dependence of the temperature TTJT of one of the ultrasound transducers 2, 3 on the temperature TM of the flowing medium.
- the diagram shown in FIG. 4 was recorded at an ambient temperature of 50 ° C. and a length of 15 cm for the insulation section 12. It can be clearly seen that, without impairment or damage to one of the ultrasonic transducers 2, 3, temperatures of up to 800 ° C. are permissible for the flowing medium.
- REPLACEMENT BLA ⁇ (RULE 26)
- the dependence of the transit times of the ultrasonic signals in the ultrasonic waveguides 6, 7 on the relevant temperature TTJSW of the ultrasonic waveguides 6, 7 is shown in FIG. 5 of the drawing.
- the upper straight line shows the dependence of the transit time of the portions of the ultrasonic signals reflected at the ends of the ultrasonic waveguides 6, 7 facing the flowing medium on the temperature of the ultrasonic waveguides 6, 7.
- the lower straight line in FIG. 5 shows the dependency of the sum of the transit times an ultrasonic signal in both ultrasonic waveguides 6, 7 depending on their temperature.
- the temperature of the flowing medium TM can be determined without problems from the transit time of the ultrasonic signals in the ultrasonic waveguides 6, 7 and can therefore be used to correct the value for the volume flow. This correction can take place, for example, by determining the current diameter of the line measuring section 1 from a known diameter of the line measuring section 1 at a predetermined temperature and the temperature of the flowing medium determined as explained on the basis of material constants of the material of the line measuring section 1.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Flow Control (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/836,177 US5824915A (en) | 1995-08-22 | 1996-08-21 | Volumetric flow meter |
DE59610004T DE59610004D1 (de) | 1995-08-22 | 1996-08-21 | Volumendurchflussmessgerät |
JP9509811A JP3068201B2 (ja) | 1995-08-22 | 1996-08-21 | 体積流量測定装置 |
EP96930062A EP0787281B1 (de) | 1995-08-22 | 1996-08-21 | Volumendurchflussmessgerät |
NO19971842A NO321656B1 (no) | 1995-08-22 | 1997-04-22 | Fremgangsmate ved bestemmelse av volumstrom |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19530807A DE19530807C2 (de) | 1995-08-22 | 1995-08-22 | Verfahren zur Bestimmung des Volumendurchflusses von strömenden Medien |
DE19530807.7 | 1995-08-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997008516A1 true WO1997008516A1 (de) | 1997-03-06 |
Family
ID=7770068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1996/003670 WO1997008516A1 (de) | 1995-08-22 | 1996-08-21 | Volumendurchflussmessgerät |
Country Status (6)
Country | Link |
---|---|
US (1) | US5824915A (de) |
EP (1) | EP0787281B1 (de) |
JP (1) | JP3068201B2 (de) |
DE (2) | DE19530807C2 (de) |
NO (1) | NO321656B1 (de) |
WO (1) | WO1997008516A1 (de) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19606411C2 (de) * | 1996-02-21 | 2000-05-11 | Krohne Messtechnik Kg | Schalldämpfer für Ultraschallwellen |
FR2763685B1 (fr) * | 1997-05-23 | 1999-07-23 | Lasertec International | Appareil de mesure de l'evolution des caracteristiques optiques d'un milieu liquide ou gazeux en circulation |
DE19727960C2 (de) | 1997-07-01 | 1999-10-14 | Peus Systems Gmbh | Vorrichtung zur zeitlich hochauflösenden Messung eines gasförmigen Volumenstromes, insbesondere eines Abgas-Volumenstromes eines Verbrennungsmotors, in einem von diesem durchströmten Rohr |
DE19861073A1 (de) * | 1998-03-02 | 1999-11-04 | Georg F Wagner | Durchflußmeßvorrichtung |
DE19808701C2 (de) * | 1998-03-02 | 2000-01-20 | Georg F Wagner | Durchflussmessvorrichtung |
DE19861186B4 (de) * | 1998-03-02 | 2005-09-08 | Schubert & Salzer Control Systems Gmbh | Duchflussmessvorrichtung |
DE19812458C2 (de) * | 1998-03-23 | 2000-05-31 | Krohne Ag Basel | Sende- und/oder Empfangskopf eines Ultraschall-Durchflußmeßgerätes |
DE59914546D1 (de) * | 1999-04-21 | 2007-12-20 | Krohne Ag | Sende- und/oder Empfangskopf eines Ultraschall-Durchflussmessgeräts |
DE10057188C8 (de) * | 2000-11-17 | 2016-10-06 | Endress + Hauser Flowtec Ag | Ultraschall-Durchflußmeßgerät mit Temperaturkompensation |
DE102004044607A1 (de) * | 2004-09-13 | 2006-03-30 | Endress + Hauser Flowtec Ag | Durchflussmessgerät mit zumindest zwei Ultraschallwandlern |
US7152490B1 (en) | 2005-08-15 | 2006-12-26 | Daniel Measurement And Control, Inc. | Methods for determining transducer delay time and transducer separation in ultrasonic flow meters |
DE102007020491A1 (de) * | 2007-04-27 | 2008-10-30 | Hydrometer Gmbh | Verfahren zur Bestimmung einer Eigenschaft eines strömenden Mediums sowie Ultraschallzähler |
DE102007027391B3 (de) * | 2007-06-11 | 2009-01-08 | Forschungszentrum Dresden - Rossendorf E.V. | Ultraschallsensor zur Messung von lokalen Strömungsgeschwindigkeiten in flüssigen Schmelzen |
DE102007027392B3 (de) * | 2007-06-11 | 2009-01-15 | Forschungszentrum Dresden - Rossendorf E.V. | Verfahren zur Messung von lokalen Strömungsgeschwindigkeiten in flüssigen Schmelzen |
DE102007027362B3 (de) * | 2007-06-11 | 2008-12-04 | Schott Ag | Verfahren und Verwendung einer Messanordnung zum Messen der Strömungsgeschwindigkeit in einer zur Glas- oder Floatglasherstellung verwendeten Glas- oder Metallschmelze |
DE102007058133A1 (de) * | 2007-11-30 | 2009-06-04 | Endress + Hauser Flowtec Ag | Messsystem, insbesondere zur Durchflussmessung eines in einer Rohrleitung strö menden Messmediums |
DE102007058132A1 (de) * | 2007-11-30 | 2009-06-04 | Endress + Hauser Flowtec Ag | Messsystem, insbesondere zur Durchflussmessung eines in einer Rohrleitung strömenden Messmediums |
DE102007062913A1 (de) * | 2007-12-21 | 2009-06-25 | Endress + Hauser Flowtec Ag | Ultraschallwandler zur Bestimmung und/oder Überwachung eines Durchflusses eines Messmediums durch ein Messrohr |
US20100198532A1 (en) * | 2008-12-30 | 2010-08-05 | Weston Gerwin | Apparatus and method for measurement of tube internal diameter |
US8511424B2 (en) | 2011-12-08 | 2013-08-20 | General Electric Company | Acoustic waveguide assemblies |
US9151651B2 (en) * | 2013-01-14 | 2015-10-06 | General Electric Company | Apparatus and method for determining temperature |
US9945737B2 (en) * | 2014-03-13 | 2018-04-17 | Siemens Energy, Inc. | Method for determining waveguide temperature for acoustic transceiver used in a gas turbine engine |
ES2735648B2 (es) * | 2018-06-19 | 2020-05-20 | Sedal S L U | Dispositivo de mezcla de liquidos con control electronico de alta dinamica de regulacion y metodo de funcionamiento del mismo |
ES2972626T3 (es) * | 2018-07-12 | 2024-06-13 | Abilene Christian Univ | Aparato, sistemas y métodos para la medición no invasiva de flujo en una tubería de alta temperatura |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4373401A (en) * | 1980-05-05 | 1983-02-15 | Joseph Baumoel | Transducer structure and mounting arrangement for transducer structure for clamp-on ultrasonic flowmeters |
JPS6193914A (ja) * | 1984-10-13 | 1986-05-12 | Sumitomo Metal Ind Ltd | 超音波式流体流量測定方法および装置 |
WO1992000507A1 (en) * | 1990-06-29 | 1992-01-09 | Panametrics, Inc. | Improved flow measurement system |
US5280728A (en) * | 1990-11-05 | 1994-01-25 | Tokimec Inc. | Ultrasonic flow velocity measurement method and apparatus thereof |
GB2279146A (en) * | 1993-06-19 | 1994-12-21 | British Aerospace | Method and assembly for measuring mass flow or velocity flow of a fluid. |
Family Cites Families (8)
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US3925692A (en) * | 1974-06-13 | 1975-12-09 | Westinghouse Electric Corp | Replaceable element ultrasonic flowmeter transducer |
US4014211A (en) * | 1975-10-21 | 1977-03-29 | Mitsubishi Denki Kabushiki Kaisha | Ultrasonic flow meter |
US4195517A (en) * | 1978-12-18 | 1980-04-01 | The Foxboro Company | Ultrasonic flowmeter |
JPS6044608B2 (ja) * | 1980-03-25 | 1985-10-04 | 動力炉・核燃料開発事業団 | 超音波式計測装置 |
US4505160A (en) * | 1983-02-07 | 1985-03-19 | Nusonics, Inc. | High-temperature transducer |
FR2598498B1 (fr) * | 1985-03-15 | 1990-01-05 | Framatome Sa | Capteur pour ondes ultrasonores destine a venir en contact avec une paroi a haute temperature et application de ce capteur |
CH670506A5 (de) * | 1986-06-17 | 1989-06-15 | Landis & Gyr Gmbh | |
US4783997A (en) * | 1987-02-26 | 1988-11-15 | Panametrics, Inc. | Ultrasonic transducers for high temperature applications |
-
1995
- 1995-08-22 DE DE19530807A patent/DE19530807C2/de not_active Expired - Fee Related
-
1996
- 1996-08-21 EP EP96930062A patent/EP0787281B1/de not_active Expired - Lifetime
- 1996-08-21 JP JP9509811A patent/JP3068201B2/ja not_active Expired - Fee Related
- 1996-08-21 DE DE59610004T patent/DE59610004D1/de not_active Expired - Lifetime
- 1996-08-21 WO PCT/EP1996/003670 patent/WO1997008516A1/de active IP Right Grant
- 1996-08-21 US US08/836,177 patent/US5824915A/en not_active Expired - Lifetime
-
1997
- 1997-04-22 NO NO19971842A patent/NO321656B1/no not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4373401A (en) * | 1980-05-05 | 1983-02-15 | Joseph Baumoel | Transducer structure and mounting arrangement for transducer structure for clamp-on ultrasonic flowmeters |
JPS6193914A (ja) * | 1984-10-13 | 1986-05-12 | Sumitomo Metal Ind Ltd | 超音波式流体流量測定方法および装置 |
WO1992000507A1 (en) * | 1990-06-29 | 1992-01-09 | Panametrics, Inc. | Improved flow measurement system |
US5280728A (en) * | 1990-11-05 | 1994-01-25 | Tokimec Inc. | Ultrasonic flow velocity measurement method and apparatus thereof |
GB2279146A (en) * | 1993-06-19 | 1994-12-21 | British Aerospace | Method and assembly for measuring mass flow or velocity flow of a fluid. |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 271 (P - 497) 16 September 1986 (1986-09-16) * |
Also Published As
Publication number | Publication date |
---|---|
JP3068201B2 (ja) | 2000-07-24 |
DE19530807A1 (de) | 1997-02-27 |
NO971842L (no) | 1997-04-22 |
NO321656B1 (no) | 2006-06-19 |
US5824915A (en) | 1998-10-20 |
EP0787281A1 (de) | 1997-08-06 |
DE59610004D1 (de) | 2003-01-30 |
NO971842D0 (no) | 1997-04-22 |
DE19530807C2 (de) | 1999-11-18 |
JPH10508111A (ja) | 1998-08-04 |
EP0787281B1 (de) | 2002-12-18 |
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