EP0807243A1 - Ultraschalldurchflussmesser - Google Patents
UltraschalldurchflussmesserInfo
- Publication number
- EP0807243A1 EP0807243A1 EP96900887A EP96900887A EP0807243A1 EP 0807243 A1 EP0807243 A1 EP 0807243A1 EP 96900887 A EP96900887 A EP 96900887A EP 96900887 A EP96900887 A EP 96900887A EP 0807243 A1 EP0807243 A1 EP 0807243A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- ultrasound
- plane
- ultrasonic flowmeter
- transducer
- 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- Withdrawn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
- 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
Definitions
- the present invention relates to an ultrasonic flowmeter for measuring liquid or gas flow through a measuring tube which is equipped with ultrasonic transducers, where the ultrasound is reflected by the tube wall which has at least one focussing reflecting plane.
- EP 0 521 855 Bl describes the same flowmeter, but the reflecting planes are curved, so that the sound waves are focussed.
- the tube bottom has a defocussing reflecting plane between the focussing planes.
- the part of the sound waves which passes a 'V path through the meter tube is damped.
- the receiving transducer receives a weak signal, which is superposed by sound waves which have followed the 'V path through the tube.
- the transducer receives a weak signal, it is sensitive to noise, which may be both mechanical and elec ⁇ tromagnetic.
- the object of the present invention is to provide a simple and cheap ultrasonic flowmeter, which can carry out accu ⁇ rate and quick measurements.
- the task set can be solved with a flowmeter as the one described in the introduction, whose at least one focussing reflecting plane is ellipsoid, and the transducers are placed in the focal points of an ellipse.
- the transducers can be placed in a transducer plane, which may be displaced laterally in relation to the axis of the meter tube.
- a transducer plane which may be displaced laterally in relation to the axis of the meter tube.
- the present invention can be implemented by reflecting the ultrasound several times from the tube wall, and the ultra ⁇ sound passes along a 'W-shaped beam path.
- a reason- able time difference is obtained for measuring downstream and upstream, even though the meter tube has a small inter ⁇ nal diameter.
- the flowmeter may have several ellipsoid mirrors where the ellipses have common focal points on reflecting planes.
- the flowmeter can be built with many reflections between the tube walls.
- An efficient flowmeter can be built in a small diameter tube. A long signal path in the medium means that low flow speeds can be measured.
- the flowmeter can be designed with at least two ellipsoid mirrors where the ellipses have a common focal point on the opposite wall of the tube, and the other focal points of the ellipses are found on the transducer surfaces.
- the common focal point can be made with special reflective properties, and damping of the ultrasonic signal decreases.
- the reflecting planes may advantageously be oblique in relation to each other and in relation to the transducers. Hereby the sound path can be mirrored out of the transducer plane.
- the ultrasonic flowmeter may be built so that ultrasound emitted from a first transducer falls first on a plane mirror which is turned through a first angle in relation to the transducer plane, after which the ultrasound is reflected by the ellipsoid reflecting plane, which is turned through a second angle in relation to the transducer plane, after which the ultrasound is reflected back to the transducer plane by the plane mirror before the ultrasound reaches the second transducer.
- ultrasonic waves can be obtained in the entire cross section of the tube. In this manner the same effect is obtained as by multi-track measuring with only one transducer set.
- the transducers may be placed on the same side of the meter tube, but turned through an angle in relation to each other. Hereby the ultrasonic waves may also be made to fill the cross section of the tube.
- the ultrasonic flowmeter may advantageously be designed so that the transducers are placed withdrawn from the medium flow on a shadow tube through which the ultrasound passes before coming into contact with the medium flow.
- damping and spreading can be achieved of sound waves fall ⁇ ing on the wall of the shadow tube. This ensures that sound waves that pass along the 'V path are reduced, and measur ⁇ ing errors are eliminated.
- the shadow tube may have internal reflecting planes which spread the ultrasound.
- part of the sound beam that hits the tube wall may be spread in different directions.
- the sound waves are transformed into a noise signal that does not disturb the measurements in the tube.
- Fig. 1 shows a section through a possible embodiment of the invention
- Fig. 2 shows a section through another possible embodiment of the invention
- Fig. 3 shows a cross section through a meter tube which is designed according to the invention
- Fig. 4 shows a section through a possible embodiment of a shadow tube
- Fig. 5 shows a section through an alternative embodiment of the invention.
- Fig. 1 shows a longitudinal section through a meter tube 1 with two ultrasonic transducers 2, 3. They may be magneto- strictive, electromagnetic, or electrostrictive.
- the trans ⁇ ducers may be designed piezoelectrically.
- the ultrasonic signal from the transducers 2, 3 are reflected in a mirror 4.
- the mirror 4 is designed as an ellipsoid of revolution, and the transducers are placed in the focal points 7, 8 of the ellipsoid.
- Fig. 2 shows a longitudinal section through another embodi ⁇ ment of the invention.
- the meter tube 1 has two transducers 2, 3, which are placed on a shadow tube 6, 7 at a distance from the medium flow.
- the mirror 4, which is designed as an ellipsoid of revolution, is shown here in the top of the tube on the same side as the transducers. In the bottom of the tube there is a plane mirror 9.
- the transducers 2, 3 are held by plugs 10, 11, which are screwed into the meter tube 1.
- the transducers 2, 3 are protected against medium contact by diaphragms 12, 13.
- the diaphragms 12, 13 are fixed between the plugs 10, 11 and collars in the meter tube 1. Sealing between the plugs 10, 11 and the meter tube 1 is effected with 0-rings 14, 15.
- a recess 16 is shown, which may be used for a temperature sensor.
- the electronic circuit may contain a display for measuring parameters.
- a keyboard may give the user a possibility of changing between various data shown on the display.
- Ultrasound is emitted from one of the transducers 2, 3, which is placed in one of the focal points 7, 8 of the ellipsoid mirror 4.
- the ultrasound is reflected first by the plane mirror 9 up against the ellipsoid mirror 4. From here the ultrasound is reflected back towards the plane mirror 9. Here the ultrasound is reflected again, after which it is concentrated in the other focal point 7, 8 on the other transducer 2, 3.
- Fig. 3 shows a crosswise section through a meter tube as the one shown in Fig. 2.
- the plane mirror 9 is turned through an angle 21 in relation to the transverse axis 20 of the meter tube 1.
- the mirror 4, which is shaped like an ellipsoid of revolution, is turned through another and larger angle in relation to the transverse axis 20 of the meter tube.
- the transducer plane 19 is laterally displaced in relation to the centre line 18 of the meter tube.
- Ultrasound is emitted from one ellipsoid focal point 7 in the direction of the plane mirror 9, which is turned through an angle 21. From here the ultrasound is reflected in an oblique direction towards the ellipsoid mirror 4. The ultrasound is spread and fills the entire meter tube cross section. By reflection of the ellipsoid mirror 4 the ultrasound is concentrated and returned via the plane mirror 9 to a focal point 9 on a transducer surface.
- a flowmeter By filling the entire cross section of the tube with ultra ⁇ sound, a flowmeter can be built which provides for various velocities of movement in the flow profile.
- the flowmeter can measure accurately at laminar as well as at turbulent flows.
- Fig. 4 shows a section through a possible embodiment of a shadow tube.
- the shadow tube 6 is shown with reflecting planes 22 on the interior side of the tube.
- Ultrasound emitted by a transducer 2 is spread, and part of the ultra ⁇ sound will fall on the interior surface of the shadow tube 6.
- Reflections from here may influence measurements in that ultrasonic waves follow another path between the trans ⁇ ducers.
- the alternative path may be shorter or longer than the desired path.
- the consequence of the undesirable waves is that they arrive either earlier or later than the proper signal. The result is inaccurate measuring.
- Fig. 5 shows a section through an alternative embodiment of the invention. Two ellipsoid mirrors 23, 24, which have a common focal point 27, are shown here. The other focal points 26, 28 of the ellipsoids lie on the surfaces of the transducers.
- the reflecting planes 27, where the sound waves are focussed may be designed of material with good reflecting properties. Holes may be drilled in the meter tube, and the reflecting planes 27 may be mounted on a plug which fills the hole. The drilled holes may be provided with threads, and screws with polished end planes may be screwed in so that the focussed ultrasound is mirrored on the screws.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK11295A DK171569B1 (da) | 1995-01-31 | 1995-01-31 | Ultralydsflowmåler "W" |
DK9501/12 | 1995-01-31 | ||
PCT/DK1996/000042 WO1996024029A1 (en) | 1995-01-31 | 1996-01-26 | Ultrasonic flowmeter 'w' |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0807243A1 true EP0807243A1 (de) | 1997-11-19 |
Family
ID=8089887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96900887A Withdrawn EP0807243A1 (de) | 1995-01-31 | 1996-01-26 | Ultraschalldurchflussmesser |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0807243A1 (de) |
CN (1) | CN1172528A (de) |
AU (1) | AU4482696A (de) |
DE (1) | DE19549162C2 (de) |
DK (1) | DK171569B1 (de) |
EA (1) | EA000212B1 (de) |
WO (1) | WO1996024029A1 (de) |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19632165A1 (de) * | 1996-08-09 | 1998-02-12 | Elster Produktion Gmbh | Verfahren und Vorrichtung zur Ultraschall-Durchflußmessung |
DE19713526A1 (de) * | 1997-04-01 | 1998-10-08 | Elster Produktion Gmbh | Vorrichtung zur Ultraschall-Durchflußmessung |
SI20344A (sl) * | 1999-06-11 | 2001-02-28 | Iskraemeco D.D. | Merilna cev ultrazvočnega merilnika pretoka plinov |
DE10057342A1 (de) * | 2000-11-18 | 2002-05-23 | Elster Produktion Gmbh | Ultraschall-Durchflußmeßgerät |
DK1255094T3 (da) * | 2001-05-04 | 2010-07-26 | Landis & Gyr Gmbh | Indretning til måling af et mediums strømningshastighed |
DE102004060062A1 (de) * | 2004-12-14 | 2006-06-29 | Robert Bosch Gmbh | Ultraschallmesseinrichtung |
DE102006023479A1 (de) * | 2006-05-18 | 2007-11-22 | Siemens Ag | Strömungskanal zur Aufnahme des Durchflusssensors |
DE102006023478A1 (de) * | 2006-05-18 | 2007-11-22 | Siemens Ag | Durchflusssensor und Strömungskanal zur Aufnahme des Durchflusssensors |
DE102006041530B4 (de) * | 2006-09-05 | 2008-10-30 | Continental Automotive Gmbh | Verfahren zur Luftmassenmessung und Luftmassensensor |
DE102009031694B3 (de) * | 2009-07-04 | 2010-10-14 | Qundis Gmbh | Durchflusszähler |
DE102010020338A1 (de) | 2010-05-12 | 2011-11-17 | Hydrometer Gmbh | Gehäuseanordnung für Ultraschall-Durchflussmesser sowie Ultaschall-Durchflussmesser |
CN101858762B (zh) * | 2010-05-19 | 2013-01-16 | 邓鲁坚 | 管壁反射式超声波流量传感器 |
CN102095889B (zh) * | 2010-11-29 | 2012-10-17 | 河海大学常州校区 | 三通道超声时差流速测量方法 |
DE102012101098A1 (de) | 2012-02-10 | 2013-08-14 | Endress + Hauser Flowtec Ag | Ultraschall-Durchflussmessgerät und Verfahren zur Ermittlung der Fließgeschwindigkeit bzw. des Volumendurchflusses eines Fluids |
DE102013105922A1 (de) * | 2013-06-07 | 2014-12-11 | Endress + Hauser Flowtec Ag | Ultraschall-Durchflussmessgerät |
CN103471672B (zh) * | 2013-09-28 | 2016-07-27 | 重庆前卫科技集团有限公司 | 燃气流量计量表的w型反射流道 |
DE102014118187A1 (de) * | 2014-12-09 | 2016-06-09 | Endress + Hauser Flowtec Ag | Ultraschall-Durchflussmessgerät |
CN105158332A (zh) * | 2015-08-24 | 2015-12-16 | 河北吉信同普电子科技开发有限公司 | 超声波探测器 |
CN105987732A (zh) * | 2016-07-28 | 2016-10-05 | 重庆前卫克罗姆表业有限责任公司 | 一种超声波燃气表或流量计反射面的设计方法 |
CN106871981A (zh) * | 2017-02-13 | 2017-06-20 | 青小武 | 一种用于超声波燃气、水、热表或流量计的流道结构 |
DE102017110308A1 (de) * | 2017-05-12 | 2018-11-15 | Krohne Ag | Ultraschalldurchflussmessgerät |
CN107505016B (zh) * | 2017-09-13 | 2022-02-08 | 湖北锐意自控***有限公司 | 气体流量计量气室及气体流量计量表 |
FR3080683B1 (fr) * | 2018-04-30 | 2023-03-17 | Buerkert Werke Gmbh & Co Kg | Moyen de mesure de fluide |
DE202018102622U1 (de) * | 2018-05-09 | 2018-05-18 | Zenner International Gmbh & Co. Kg | Ultraschallzähler |
CN108759946A (zh) * | 2018-08-08 | 2018-11-06 | 北京名旭测控科技有限公司 | 一种采用椭圆球立体聚焦的超声波燃气表反射流道 |
US11137275B2 (en) * | 2018-10-05 | 2021-10-05 | Honeywell International Inc. | Ultrasonic flow meter with lens combination |
CN109781671B (zh) * | 2019-03-11 | 2021-11-05 | 西北核技术研究所 | 一种透射率在线测试方法及装置 |
MX2020011238A (es) | 2019-10-31 | 2022-02-10 | Neptune Tech Group Inc | Elemento de medicion unificado para conjunto de medidor de agua. |
CN110864751B (zh) * | 2019-12-30 | 2024-07-05 | 郑州引领科技有限公司 | 一种超声波燃气表专用声道 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3911408C2 (de) * | 1989-04-07 | 1998-01-29 | Siemens Ag | Meßrohr für Ultraschall-Durchflußmessungen |
DE3941544A1 (de) * | 1989-12-15 | 1991-06-20 | Siemens Ag | Ultraschall-durchflussmesser |
DE4010148A1 (de) * | 1990-03-29 | 1991-10-02 | Siemens Ag | Verbesserung fuer einen ultraschall-gas-/fluessigkeits-durchflussmesser |
FR2683046B1 (fr) * | 1991-10-25 | 1994-02-04 | Schlumberger Industries | Dispositif de mesure de la vitesse d'un fluide. |
DE4336368C2 (de) * | 1993-10-25 | 1995-08-03 | Siemens Ag | Vorrichtung zur Durchflußmessung |
-
1995
- 1995-01-31 DK DK11295A patent/DK171569B1/da not_active IP Right Cessation
- 1995-12-30 DE DE1995149162 patent/DE19549162C2/de not_active Expired - Fee Related
-
1996
- 1996-01-26 EA EA199700148A patent/EA000212B1/ru not_active IP Right Cessation
- 1996-01-26 WO PCT/DK1996/000042 patent/WO1996024029A1/en not_active Application Discontinuation
- 1996-01-26 CN CN 96191690 patent/CN1172528A/zh active Pending
- 1996-01-26 EP EP96900887A patent/EP0807243A1/de not_active Withdrawn
- 1996-01-26 AU AU44826/96A patent/AU4482696A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9624029A1 * |
Also Published As
Publication number | Publication date |
---|---|
EA000212B1 (ru) | 1998-12-24 |
AU4482696A (en) | 1996-08-21 |
EA199700148A1 (ru) | 1998-02-26 |
CN1172528A (zh) | 1998-02-04 |
DK171569B1 (da) | 1997-01-13 |
WO1996024029A1 (en) | 1996-08-08 |
DE19549162A1 (de) | 1996-08-01 |
DE19549162C2 (de) | 1999-04-01 |
DK11295A (da) | 1996-08-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19970708 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB GR IE IT LI NL PT SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19990607 |