• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Volumetric fluid flow in a cylindrical conduit is determined by measuring the average flow velocity of the fluid flowing through a chordal measuring path lying at a radial distance of 0.54R where R is the radius of the conduit. This average flow velocity is multiplied by constants related to the location of the chordal path and to the chordal path length. The average flow velocity measurement is made by the use of an ultrasonic flow meter having upstream and downstream transducers which define the chordal measuring path. Multiple measuring paths are preferred.
    公开号:SU753367A3
    申请号:SU772505406
    申请日:1977-07-22
    公开日:1980-07-30
    发明作者:Эдмунд Браун Альвин
    申请人:Е.И.Дюпон Де Немур Энд Компани (Фирма)；
    IPC主号:
    专利说明:

    ultrasonic transducer; in fig. 3 is a graph of weighting factors for calculating the volumetric flow rate for different flow profiles (for the values of the ratio of the average flow rate to the maximum 0.78; 0.9; 1, and for the lamps and the names of the “note”. - l. .).
    On a segment of pipeline 1 of radius R there is a pair of sensors of the ultrasonic transducer 2 with the possibility of ultrasound propagation through the stream along chord 3, the shortest distance of which X from the axis of the pipeline is 0.5-0.6 R (Figures I and 2). In the case of a flow with turbulence or with a structural core, the path is placed at a distance of 0.54 R, and the b laminar flows are 0,, 5 R. When there are four,: ultrasonic transducers 2, placed on the pipeline / in such a way that the trajectories are equally spaced, have the same length, the outputs of the ultrasonic transducers 2 are connected to a measuring circuit that includes meters 4 of the average flow velocity on each chord, adder 5 and multiplier 6.
    The device works in the following way.
    Each pair of sensors of the transducers 2 are radiated towards each other, and after passing through the medium, ultrasonic waves are received. The signals at the outputs of gauges 4 are proportional to the average values of the flow velocity for each chord 3. The output signals of gauges 4 for each chord of the same length are added in the adder 5 iH is fed to the input of multiplier 6, where the operation and multiplication of this signal, the values of the radius R of the pipeline 1, the lengths of the ultrasound trajectory segments along chords 3 and the average weight and coefficient of coefficients. It also divides by the number of paths. As a result, at the output of the measuring circuit, a signal is obtained that is proportional to the volume-flow rate of the medium flowing through the pipeline /.
    From the graph (Fig. 3) it can be seen that if we choose the value of the weight coefficient for the distance X to the chord, equal to 0.54 R, as an average, then in the range of values x, 5 from 0.5 to 0.6,
    BUT
    the volumetric flow rate will be small for flows with different turbulence (as the ratio of the average
    flow rates to the maximum ranging from 0.78 to 1).
    For measurement only in streams with turbulence and with a structural core at 5, the error is obtained with a value of —0, 54, For measurement and in laA
    It is necessary to choose the trajectory along the minor streams along the chord 3, which is at a distance of 0.5 R. With an increase in the number of trajectories, the accuracy of measuring the volume flow rate increases, “about more than four trajectories | it is advisable to choose, because the accuracy in this case increases
     insignificantly and does not justify the costs “and additional equipment
    The proposed device has high measurement accuracy for different flow profiles while simplifying the data processing unit, which is due to the choice of measurement trajectories at the same radial distances and equal segments of the headers.
    权利要求:
    Claims (3)
    [1]
    1. A device for measuring volumetric flow in a cylindrical pipe,
    containing ultrasonic transducers installed in the pipeline, which are connected to the measuring circuit, characterized in that, in order to improve the measurement accuracy, the ultrasonic transducers are located with the possibility of ultrasound propagation through a stream of equal length, the shortest distance to the pipeline axis is 0 , 5-0,6 R, where R -
    pipeline radius.
    [2]
    2. The device according to claim I, characterized in that, for the purpose of measurement in streams with turbulence and with a structural core, the shortest distance from the chords to the axis of the pipeline is 0.54 R.
    [3]
    3. The device according to claim .1, characterized in that, for the purpose of measurement in laminar flows, the shortest distance from the chords to the axis of the pipeline is 0.5 R.
    Sources of information taken into account in the examination:
    1. US Patent Poison 3564912, cl. G 01 P 5/00, 1971 h
    2. US patent No. 3780577, cl. G 01 P 5/00, 1973 (prototype).
    类似技术:
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    同族专利:
    公开号 | 公开日
    DK330977A|1978-01-24|
    CA1095163A|1981-02-03|
    DE2732236A1|1978-01-26|
    US4102186A|1978-07-25|
    SE7707605L|1978-01-24|
    FR2359402A1|1978-02-17|
    GB1579686A|1980-11-19|
    NL7708161A|1978-01-25|
    JPS5315162A|1978-02-10|
    IT1081165B|1985-05-16|
    DE2732236B2|1981-03-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3564912A|1968-10-28|1971-02-23|Westinghouse Electric Corp|Fluid flow measurement system|
    JPS495361A|1972-04-28|1974-01-18|
    US4078428A|1974-11-21|1978-03-14|National Research Development Corporation|Measurement of fluid flow|
    US3940985A|1975-04-18|1976-03-02|Westinghouse Electric Corporation|Fluid flow measurement system for pipes|US4317178A|1979-03-01|1982-02-23|Fischer & Porter Company|Multiple velocity traverse flow rate measuring technique|
    US4300401A|1979-10-09|1981-11-17|Panametrics, Inc.|Method and apparatus for determining fluid flow|
    US4383533A|1981-02-10|1983-05-17|The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration|Apparatus for determining changes in limb volume|
    US4442719A|1982-01-11|1984-04-17|Allen Ollie J|Acoustic flowmeter|
    US4462261A|1982-04-27|1984-07-31|The Babcock & Wilcox Company|Mass and velocity flowmeter|
    GB2135457A|1983-02-11|1984-08-30|British Steel Corp|Improvements in or relating to apparatus for flow measurement|
    GB2139755B|1983-05-11|1987-03-04|British Gas Corp|Ultrasonic flowmeter|
    NO841671L|1984-04-27|1985-10-28|Jan Stageboe|CONCRETE TAG PLATFORMOF CONCRETE.|
    US5437194A|1991-03-18|1995-08-01|Panametrics, Inc.|Ultrasonic transducer system with temporal crosstalk isolation|
    IT1272370B|1993-04-27|1997-06-23|Nuovo Pignone Spa|PERFECTED METER-REGULATOR OF THE FLOW RATE OF A FLUID|
    NL9301422A|1993-08-17|1995-03-16|Servex Bv|Method and device for determining properties of the flow of a medium.|
    NL1001719C2|1995-11-22|1997-05-23|Krohne Altometer|Method and device for the ultrasonic measurement of the velocity and flow rate of a medium in a pipeline.|
    NL1004544C2|1996-11-15|1998-05-18|Instromet Ultrasonics Bv|Method and device for determining the flow rate and / or throughput of a flowing fluid.|
    US6463808B1|1998-10-05|2002-10-15|Robert H. Hammond|Ultrasonic measurement system with chordal path|
    US6401538B1|2000-09-06|2002-06-11|Halliburton Energy Services, Inc.|Method and apparatus for acoustic fluid analysis|
    DE10158947A1|2001-12-03|2003-06-12|Sick Ag|Fluid flow speed sensor has several ultrasonic paths in one plane|
    JP4561071B2|2003-09-26|2010-10-13|パナソニック株式会社|Flow measuring device|
    DE102005063313B4|2005-02-17|2010-01-28|Hydrometer Gmbh|Flowmeter|
    DE102005045485A1|2005-09-22|2007-04-12|Endress + Hauser Flowtec Ag|Method for system and / or process monitoring in an ultrasonic flowmeter|
    JP4579220B2|2006-11-08|2010-11-10|パナソニック株式会社|Ultrasonic fluid measuring device|
    WO2009074162A1|2007-12-10|2009-06-18|Siemens Aktiengesellschaft|Ultrasonic type fluid flow measurement apparatus|
    US7752919B2|2008-07-09|2010-07-13|Daniel Measurement And Control, Inc.|System and method of an acoustic flow meter with dual flow measurements|
    US7735380B2|2008-07-09|2010-06-15|Daniel Measurement & Control, Inc.|Method and system of coordination of measurement subsystems of a flow meter|
    US7942068B2|2009-03-11|2011-05-17|Ge Infrastructure Sensing, Inc.|Method and system for multi-path ultrasonic flow rate measurement|
    US8146442B2|2009-07-24|2012-04-03|Elster NV/SA|Device and method for measuring a flow characteristic of a fluid in a conduit|
    US8528420B2|2009-12-09|2013-09-10|Energyneering Solutions, Inc.|Eccentric venturi flow measurement device|
    DE202010004669U1|2010-04-01|2010-08-05|SONOTEC Dr. zur Horst-Meyer und Münch OHG|Ultrasonic flow meter, in particular for flow measurement of fluids in small-volume pipes|
    US8291773B2|2010-10-19|2012-10-23|Sick Engineering Gmbh|Ultrasonic measurement of flow velocity|
    US9316517B2|2011-09-23|2016-04-19|Daniel Measurement And Control, Inc.|System and method for combining co-located flowmeters|
    WO2014175588A1|2013-04-25|2014-10-30|주식회사 우진|Ultrasonic flow rate measurement system|
    GB2521661A|2013-12-27|2015-07-01|Xsens As|Apparatus and method for measuring flow|
    US9304024B2|2014-01-13|2016-04-05|Cameron International Corporation|Acoustic flow measurement device including a plurality of chordal planes each having a plurality of axial velocity measurements using transducer pairs|
    EA201991560A1|2017-01-17|2020-01-30|Рубикон Ресёрч Пти Лтд|FLOW MEASUREMENT|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/708,284|US4102186A|1976-07-23|1976-07-23|Method and system for measuring flow rate|
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