EP2656018A1 - Débitmètre à ultrasons - Google Patents

Débitmètre à ultrasons

Info

Publication number
EP2656018A1
EP2656018A1 EP11790592.7A EP11790592A EP2656018A1 EP 2656018 A1 EP2656018 A1 EP 2656018A1 EP 11790592 A EP11790592 A EP 11790592A EP 2656018 A1 EP2656018 A1 EP 2656018A1
Authority
EP
European Patent Office
Prior art keywords
ultrasonic
bore
measuring tube
window
longitudinal axis
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Withdrawn
Application number
EP11790592.7A
Other languages
German (de)
English (en)
Inventor
Oliver Berberig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP2656018A1 publication Critical patent/EP2656018A1/fr
Withdrawn legal-status Critical Current

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, with a
  • Ultrasonic transducer in a bore of a measuring tube, which ultrasonic transducer has an ultrasound radiating surface, hereinafter called ultrasound window.
  • Ultrasonic flowmeters are widely used in process and automation technology. They allow in a simple way to determine the volume flow and / or mass flow in a pipeline.
  • the known ultrasonic flowmeters often work according to the Doppler or the transit time difference principle.
  • ultrasonic pulses When running time difference principle, the different maturities of ultrasonic pulses are evaluated relative to the flow direction of the liquid. For this purpose, ultrasonic pulses are sent at a certain angle to the pipe axis both with and against the flow. From the transit time difference, the flow rate and thus at known
  • the ultrasonic waves are generated or received with the help of so-called ultrasonic transducers.
  • the transit time is determined in US-A 50 52 230 by means of short ultrasonic pulses.
  • the ultrasonic transducers are mounted in contact with the medium or fluid.
  • a significantly higher sound power can be coupled into the fluid in comparison to clamp-on systems, and the sound can be transmitted to the fluid
  • Measuring tube is guaranteed under all operating conditions.
  • In order to maximize the ratio of useful signal to interference signal usually comes an arrangement of
  • Ultrasonic transducer is used, in which the ultrasonic transducers on a direct
  • Measuring tube axis because in this case the ultrasonic transducers or introduced into the measuring tube reflectors are within the flow. These limitations result in an ultrasound transducer arrangement, which is inclined for the measurement tube axis, typically for ultrasonic flowmeters, which is used in conjunction with the ultrasonic transducer
  • the ultrasonic transducers do not protrude into the flow, e.g. To minimize flow losses, to protect the units from abrasion or damage, so arise between the ultrasonic transducer and the
  • Cylinder jacket of the flow-through measuring tube hereinafter referred to as measuring tube boundary surface, fluid-filled cavities.
  • Grid insert proposed to be acoustically permeable due to adapted dimensions.
  • a disadvantage of this solution is the expected acoustic attenuation or scattering of the sound as well as the risk of clogging of the mesh with fluids
  • JP2003202254 there is a proposal in which the cavities described above are closed by a kind of pinhole.
  • the cavity between ultrasonic transducer unit and pinhole should be designed so that laterally directed sound waves run dead fast.
  • Such a device due to the reduced sound opening to a weakening of the useful signal, could clog in fluids with solids fractions, and leads to a possible air entrapment when used in liquids, which also adversely affects the useful signal strength.
  • the object of the invention is to propose an ultrasonic flow meter, which has a high accuracy of measurement over one from laminar to highly turbulent
  • baffles in the described cavity between the ultrasonic window and measuring tube boundary surface causes the formation of secondary flows described in these cavities is hindered. This is done on the one hand by geometric subdivision of the cavity through the baffles, which significantly reduce the volume for such currents and provide for an early deflection of moving in the flow components in the cavity.
  • additional surfaces cause additional fluid shear stresses, which result from the interaction between baffle (keyword "wall condition") and adjacent fluid volume resulting in an increased local deceleration of moving fluid fractions.
  • a guide plate according to the invention is a substantially planar thin plate with approximately plane-parallel plate surfaces. It is not limited to a "sheet metal" in the colloquial sense.
  • the first or further baffles may be made of metal to meet hygiene requirements sufficient in particular stainless steel such as
  • baffle refers only to the shape of the same. According to one embodiment of the invention, the baffles extend to the
  • Measuring tube interface because there the secondary components due to the interaction between the main flow and fluid volume in the bore cavity have their origin.
  • Main flow direction in the measuring tube which in particular corresponds to the measuring tube longitudinal axis, by the type of attachment of the baffles in the bore cavity, for example at the bore wall, the ultrasonic window or at an annular gap around the ultrasonic transducer, or through the constructive design of the baffles in the vicinity of the ultrasonic window, eg with
  • FIG. 2 shows the ultrasonic transducer from FIG. 1 with baffles according to the invention arranged in a cruciform manner in the bore and rotated at 45 ° thereto,
  • Fig. 3 shows an ultrasonic transducer with baffles according to the invention with recesses in the baffles.
  • Fig. 1 is an inventive ultrasonic flowmeter, with a
  • Ultrasonic transducer 5 in a bore 4 of a measuring tube 2, which ultrasonic transducer 5 has an ultrasonic window 6, is shown.
  • a first baffle 7 is in the bore 5 of the measuring tube 2 in front of the ultrasonic window 6 and perpendicular to the ultrasonic window 6 of the
  • Ultrasonic transducer 5 is used.
  • the ultrasonic flowmeter is a so-called in-line ultrasonic flowmeter, which includes the measuring tube 2 with.
  • the ultrasonic window 6 is also called active area. By this ultrasonic window 6 ultrasonic signals are coupled out of the ultrasonic transducer 5 or in the
  • Ultrasonic transducer 5 coupled.
  • the bore 4 in the measuring tube 2, more precisely in the wall 3 of the measuring tube 2, in which the ultrasonic transducer 5 and the first baffle 7 are used, has a bore longitudinal axis, not shown here. This is, for transit time difference measurement by means of the ultrasonic flowmeter, inclined to the main flow direction of the medium in the measuring tube 2.
  • the bore longitudinal axes lie in a first plane parallel to each other and additionally parallel to a second plane in which the measuring tube is located. If now the bore longitudinal axes would be moved parallel to the second plane, they would cut the measuring tube longitudinal axis at an angle not equal to 90 °.
  • the angles for the ultrasonic signal paths between two ultrasonic transducers of a conventional in-line ultrasonic flowmeter, in which the ultrasonic transducers face each other, in particular their ultrasonic windows lie in parallel planes, and an ultrasonic signal path forms a straight line, in which both bore longitudinal axes lie, in which holes the Both ultrasonic transducers are used are typically between 30 and 60 ° to
  • the ultrasonic flowmeter is a single-jet measuring device, only two opposing ultrasonic transducers 5 are provided, between which only one signal path runs and, as a rule, this intersects the measuring tube longitudinal axis. Then, of course, no parallel shift described above is necessary. However, if it is a multi-beam device with multiple signal paths, these are usually offset from the center and thus out of the second level of the measuring tube longitudinal axis.
  • the bore 4 in this embodiment of the invention has a bore longitudinal axis in the first plane parallel to the second plane of the Meßrohrlijnsachse, wherein the distance between the two levels greater than 10%, in particular greater than 25%, of the diameter of the measuring tube is 2.
  • a multi-beam ultrasonic flowmeter for example, a four-beam ultrasonic flowmeter and its illustrated section shows an offset from the middle of the measuring tube 2 out ultrasonic transducer 5.
  • the invention can also be used in single-beam, two-beam or multi-beam ultrasonic flowmeters , Especially in those that determine the flow by means of the transit time difference principle.
  • the bore 4 in the measuring tube wall 3 forms a cavity in the measuring tube wall 3. This cavity is partially filled in by it
  • the inner surface of the measuring tube wall 3 limits the volume of the measuring tube 2 and thus the medium located therein.
  • the measuring tube wall 3 is changed.
  • the above-described, original inner surface of the measuring tube 2, in particular in the region of the bore 4, is referred to below as the measuring tube boundary surface.
  • the bore 4 and thus the cavity formed by it in the measuring tube wall 3 is through the
  • the first guide plate 7 is inserted into the hollow space of the bore 4 between the ultrasonic window 6 of the ultrasonic transducer 5 and the measuring tube boundary surface in the bore 4 of the measuring tube 2 in its measuring tube wall 3 perpendicular to the ultrasonic window 6 of the ultrasonic transducer 5 in the hollow space of the bore 4 which is not filled by the ultrasonic transducer 5. It is thin compared to its longitudinal and / or transverse extent, here perpendicular to the ultrasonic window 6 of the ultrasonic transducer 5. It thus has a significant extent parallel to
  • the first baffle 7 does not substantially project into the measuring tube 2, according to one embodiment. Here it touches the measuring tube interface, but does not cut it. Its facing the interior of the measuring tube 2 and thus facing away from the ultrasonic window 6 of the ultrasonic transducer 5 end face forms the contour of the measuring tube boundary surface. Simplified, this front side could also be formed by one, two or more straight sections or any other shape which approximates the contour of the measuring tube boundary.
  • the ultrasonic transducer 5 here has a circular ultrasonic window 6 and thus a
  • the width of the first guide plate 7 perpendicular to the bore longitudinal axis corresponds for example to at least the diameter of the
  • Ultrasonic window 6 corresponds to the diameter of the bore 4, also because the bore 4 is circular here. Otherwise, appropriate equivalents to the diameter are to be used. Since, as described above, the first guide plate 7 simulates the contour of the measuring tube boundary surface on its end face facing the interior of the measuring tube 2, it is here
  • the first guide plate is formed approximately triangular, since the ultrasonic window 6 also approximately touches the measuring tube interface.
  • the first guide plate has at least one point, here at its the ultrasonic window 6 facing end side to this width.
  • the end face of the first guide plate facing the ultrasonic window can have recesses and thus not the entire width of the first guide plate is filled with material.
  • baffle can be sufficient to meet the requirements
  • the ultrasonic flowmeter according to the invention thus has a second baffle 8 in the bore 4 in front of the ultrasonic window 6 and perpendicular to the ultrasonic window 6 of
  • Ultrasonic transducer 5 on. This is shaped trapezoidal here. All of the above statements relating to the first baffle 7 are also transferable to the second baffle 8 and apply mutatis mutandis to the second baffle and / or a third baffle or other baffles, if any. That Here, the second baffle 8 is of course also thin and does not protrude significantly into the measuring tube 2 inside.
  • the second baffle 8 is used according to the illustrated embodiment perpendicular to the first guide plate 7 in the bore 4.
  • the second baffle 8 is here in the first plane of the bore longitudinal axis.
  • the first guide plate 7 is thus perpendicular to this first plane.
  • the described position of the guide plates 7 and 8 to the first plane of the bore longitudinal axis parallel to the plane of the Meßrohrlinhosachse depends on the respective conditions such as,
  • angles between 0 and 90 °, ie 5 °, 10 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 ° and 90 ° of the baffles conceivable to each other.
  • this is the case when a further, third baffle is inserted into the bore of the measuring tube in front of the ultrasonic window and perpendicular to the ultrasonic window of the ultrasonic transducer.
  • the angles between the baffles can be the same size, so here 60 °.
  • Fig. 2 an inventive ultrasonic flowmeter is now seen, the bore longitudinal axis in a first plane parallel to a second plane of the
  • Measuring tube longitudinal axis is, wherein the first guide plate 7 is in a third plane in a Wnkel of 45 ° to the first plane of the bore longitudinal axis.
  • a second guide plate 8 is inserted into the bore 4 of the measuring tube 2 in front of the ultrasonic window 6 and perpendicular to the ultrasonic window 6 of the ultrasonic transducer 5 and perpendicular to the first guide plate 7.
  • the inline ultrasonic flowmeter according to the invention minimizes the by the
  • the position of the baffles depends on the first level of the
  • FIG. 3 illustrates that the first baffle 7 has recesses 9, which the
  • Ultrasonic windows 6 are facing, to avoid deposits.
  • Ultrasonic transducer 5 and the measuring tube wall 3 an annular gap 10, since the ultrasonic transducer 5 does not completely fill the bore 4 radially to the bore longitudinal axis.
  • the baffles may be designed so that they at least partially extend into this annular gap 10. LIST OF REFERENCE NUMBERS

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un débitmètre à ultrasons équipé d'un transducteur ultrasonique (5) dans un trou (4) d'un tube de mesure (2), ledit transducteur ultrasonique (5) présentant une fenêtre à ultrasons (6), une tôle déflectrice (7) étant placée dans le trou (4) du tube de mesure en amont de la fenêtre à ultrasons (6) et perpendiculairement à la fenêtre à ultrasons (6) du transducteur ultrasonique (5).
EP11790592.7A 2010-12-21 2011-11-23 Débitmètre à ultrasons Withdrawn EP2656018A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010063789A DE102010063789A1 (de) 2010-12-21 2010-12-21 Ultraschall-Durchflussmessgerät
PCT/EP2011/070845 WO2012084392A1 (fr) 2010-12-21 2011-11-23 Débitmètre à ultrasons

Publications (1)

Publication Number Publication Date
EP2656018A1 true EP2656018A1 (fr) 2013-10-30

Family

ID=45065884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11790592.7A Withdrawn EP2656018A1 (fr) 2010-12-21 2011-11-23 Débitmètre à ultrasons

Country Status (5)

Country Link
US (1) US9157779B2 (fr)
EP (1) EP2656018A1 (fr)
CN (1) CN103270395B (fr)
DE (1) DE102010063789A1 (fr)
WO (1) WO2012084392A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014004747B4 (de) * 2013-10-30 2023-02-16 Krohne Ag Ultraschall-Durchflussmesser
CN105865549B (zh) * 2016-06-01 2021-11-30 山东力创科技股份有限公司 热量表用超声波测量装置
CN105973336A (zh) * 2016-07-01 2016-09-28 北京京源水仪器仪表有限公司 导流反射支架
EP3376177B1 (fr) * 2017-03-14 2019-11-20 Endress + Hauser Flowtec AG Débitmètre à ultrasons
DE102018109807B4 (de) * 2018-04-24 2022-10-27 Endress+Hauser Flowtec Ag Ultraschallwandler und Durchflussmessgerät

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477419A1 (fr) * 1990-09-28 1992-04-01 Siemens Aktiengesellschaft Module de mesure de débit à ultrasons devant être intégré dans une conduite de mesure
US6089104A (en) * 1996-05-27 2000-07-18 Chang; Hak Soo Ultrasonic flow meter using transit time across tube chords for determining the flow rates
DE10153297A1 (de) * 2001-09-14 2003-04-03 Krohne Ag Basel Ultraschallwellensende- bzw. -empfangsvorrichtung
US6748811B1 (en) * 1999-03-17 2004-06-15 Matsushita Electric Industrial Co., Ltd. Ultrasonic flowmeter
JP2009288151A (ja) * 2008-05-30 2009-12-10 Ricoh Elemex Corp 超音波流量計

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906791A (en) 1973-10-01 1975-09-23 Panametrics Area averaging ultrasonic flowmeters
FR2385084A1 (fr) * 1977-03-25 1978-10-20 Crouzet Sa Perfectionnement aux debitmetres a ultrasons
US5052230A (en) 1988-07-08 1991-10-01 Flowtec Ag Method and arrangement for flow rate measurement by means of ultrasonic waves
DE59010261D1 (de) 1990-09-28 1996-05-09 Siemens Ag Ultraschall (US)-Durchflussmesser-Einbaueinheit zum Einbauen in ein Messrohr
DE4222286C1 (de) * 1992-06-03 1994-05-11 Reutter Georg Dr Ultraschall-Spirometer
JPH0921666A (ja) * 1995-07-05 1997-01-21 Matsushita Electric Ind Co Ltd 超音波流量計
NL1001719C2 (nl) 1995-11-22 1997-05-23 Krohne Altometer Werkwijze en inrichting voor de ultrasone meting van de snelheid en doorstroomhoeveelheid van een medium in een buisleiding.
US6189389B1 (en) * 1996-05-28 2001-02-20 Krohne A.G. Ultrasonic flowmeter
DE19861075C2 (de) * 1998-03-02 2001-11-29 Schubert & Salzer Control Syst Durchflussmessvorrichtung
US6694824B2 (en) * 2000-10-10 2004-02-24 Matsushita Electric Industrial Co., Ltd. Flow measuring device
JP3518538B2 (ja) 2001-10-31 2004-04-12 松下電器産業株式会社 超音波流量計測装置
KR100694937B1 (ko) * 2003-02-24 2007-03-14 마츠시타 덴끼 산교 가부시키가이샤 초음파식 유체 계측 장치
DE102004060062A1 (de) * 2004-12-14 2006-06-29 Robert Bosch Gmbh Ultraschallmesseinrichtung
DE102004060064B4 (de) * 2004-12-14 2016-10-20 Robert Bosch Gmbh Ultraschall-Durchflussmesser mit Turbulatoren
DE102004060065B4 (de) * 2004-12-14 2016-10-20 Robert Bosch Gmbh Ultraschall Durchflussmesser mit Leitelementen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477419A1 (fr) * 1990-09-28 1992-04-01 Siemens Aktiengesellschaft Module de mesure de débit à ultrasons devant être intégré dans une conduite de mesure
US6089104A (en) * 1996-05-27 2000-07-18 Chang; Hak Soo Ultrasonic flow meter using transit time across tube chords for determining the flow rates
US6748811B1 (en) * 1999-03-17 2004-06-15 Matsushita Electric Industrial Co., Ltd. Ultrasonic flowmeter
DE10153297A1 (de) * 2001-09-14 2003-04-03 Krohne Ag Basel Ultraschallwellensende- bzw. -empfangsvorrichtung
JP2009288151A (ja) * 2008-05-30 2009-12-10 Ricoh Elemex Corp 超音波流量計

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2012084392A1 *

Also Published As

Publication number Publication date
US9157779B2 (en) 2015-10-13
WO2012084392A1 (fr) 2012-06-28
DE102010063789A1 (de) 2012-06-21
CN103270395A (zh) 2013-08-28
US20130283930A1 (en) 2013-10-31
CN103270395B (zh) 2016-03-23

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