WO1996030724A1 - Appareil de mesure de debit - Google Patents

Appareil de mesure de debit Download PDF

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Publication number
WO1996030724A1
WO1996030724A1 PCT/GB1995/000697 GB9500697W WO9630724A1 WO 1996030724 A1 WO1996030724 A1 WO 1996030724A1 GB 9500697 W GB9500697 W GB 9500697W WO 9630724 A1 WO9630724 A1 WO 9630724A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow measuring
measuring apparatus
flow
receiver
transmitter
Prior art date
Application number
PCT/GB1995/000697
Other languages
English (en)
Inventor
Cyril Ward Nugent
Original Assignee
Umeco Systems Limited
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 Umeco Systems Limited filed Critical Umeco Systems Limited
Priority to AU20774/95A priority Critical patent/AU2077495A/en
Priority to PCT/GB1995/000697 priority patent/WO1996030724A1/fr
Publication of WO1996030724A1 publication Critical patent/WO1996030724A1/fr

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
    • G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters

Definitions

  • This invention relates to apparatus for measuring flow of substances particularly although not exclusively to measuring flow of fluids through dispense pipes.
  • flow measuring apparatus comprising a flow passage through which a substance can flow, at least two transmitters to transmit an oscillating signal respectively in opposite directions in said passage, at least two receivers disposed spaced from said transmitters to receive said signals transmitted from said transmitters and phase difference calculating means operable to calculate a phase difference between transmitted signals received at said receiver.? and to produce an output indication of the flow velocity of the substance through the pipes from said phase difference.
  • each said transmitter and receiver are formed as a single transmitter/receiver device switchable so as to operate as a transmitter or receiver.
  • said oscillating signal comprises an ultrasonic wave which may be at a frequency of 2MHz. If desired, a packet or small burst of ultrasonic waves may be used.
  • the receivers and transmitters or receiver/ transmitter units are interconnected so that operation thereof, can be achieved simultaneously.
  • the receivers/transmitters comprise crystal oscillators which can be driven at any desired frequency.
  • the crystal oscillators can be driven at a frequency to produce an oscillating signal having a frequency 2MHz.
  • the transmitter can be driven so as to produce packets, bursts or pulses of oscillating signals at an appropriate frequency.
  • the flow passage and/or transmitters and/or receivers can be encapsulated with a plastics material for protection purposes.
  • Fig. 1 shows a plan view of one form of flow measuring apparatus according to the present invention.
  • Fig. 2 shows a diagrammatic representation of one form of circuit for producing an output indicative of the flow velocity of a substance through the flow passage.
  • FIG. 1 flow measuring apparatus 10 for measuring the flow of fluid through a dispense pipe.
  • the apparatus comprises a flow passage 11 of generally U-shaped form, a pair of transmitter/receiver devices 12 and control circuitry 13. All of the components of the measuring apparatus are encapsulated in a block of plastics material 14 to provide protection to the apparatus and in particular the control circuitry 13 and flow passage 11.
  • the flow passage 11 is generally of inverted U-shape form and comprises an inlet part 16 and an outlet part 17 linked by a flow measuring part 18.
  • the flow measuring part 18 is generally straight and extends parallel to a longitudinal axis of the block but laterally spaced therefrom.
  • the pair of transmitter/receivers 12 are mounted adjacent respective ends of the flow measuring part 18 of the flow passage and are directed inwardly along the flow measuring part in generally opposite directions.
  • the transmitter/receiver devices 12 comprise crystal oscillators which are switchable between transmit and receive modes under the control of the control circuitry 13.
  • the devices 12 are mounted relative to the flow passage 11 in a manner whereby oscillating signals produced by the devices 12 when in transmit mode can be directed generally along a longitudinal axis of the flow passage in opposite directions.
  • the control circuitry 13 can conveniently be mounted on a printed circuit board ⁇ PCB) which can be incorporated in the block between arms 16, 17 of the flow passage 11.
  • the control circuitry is shown more clearly in Fig. 2 and comprises a pair of window circuits 21 of conventional form, a conventional Schmitt trigger circuit 22 and a gate circuit 23 which acts to produce a d.c. output voltage indicative of the flow velocity of the fluid in the flow passage.
  • the flow measuring apparatus 10 is connected in the dispense pipe of a fluid to be dispensed to allow the fluid to flow from the inlet 24 to the outlet 26 of the apparatus.
  • a burst of oscillating signals are emitted by the devices 12 for a predetermined period of time. It will be appreciated that given the location and orientation of the devices, when the oscillating signals are emitted, the signal from one device 12 travels generally parallel to and in the same direction as the fluid in a flow measuring part 18 of the flow passage 11 and the signal from the other device 12 travels in a direction opposite to the direction of the flow of fluid in the flow measuring part 18.
  • the oscillating signals travelling in each direction have a phase shift imposed upon them by the effects of the fluid flow velocity in the passage 11, the effect being in the opposite sense on each signal.
  • the switching circuit 27 switches the mode of the devices 12 into receive mode in order that the oscillating signals as modified by the flow of fluid in the passage can be received.
  • the signals received by the devices at each end of the flow measuring part 18 of the passage 11 are passed through a conventional window circuit 21 which separates out the received signals from the effects of static flow, turbulence, etc.
  • the separated received signals are then squared by passage through a conventional Schmitt trigger circuit 22 to provide a suitable input for a gate circuit 23.
  • the gate circuit comprises an EXOR (exclusive OR) gate (not shown) which compares the phase difference between the respective signals received by the two devices 12 and produces an output d.c. signal via a resistive load (not shown) indicative of the phase difference and hence the velocity of flow in the flow passage. Since it is thought that frequencies of oscillating signals of the order of 2MHz will be used, it is possible to use a microprocessor based switching circuit or arrange for the switching of the devices 12 between the two modes by a computer to allow high speed switching. Furthermore, if desired, microprocessor based or computer based circuit can be used to process the received signals in lieu of, or additionally to, the window circuits 21. In this case the computer based circuit can identify and remove any noise or other unwanted addition to the received signal to produce a more accurate output.
  • EXOR exclusive OR
  • the flow measuring apparatus of the present invention will find particular application in the control of fluid flow in dispense pipes for the dispensing of mixer drinks in which commonly a number of dispense pipes are provided for a number of constituents which are mixed to provide the finished drink.
  • dispense pipes for the dispensing of mixer drinks
  • the invention can however be used in any situation where accurate dispensing of fluids is required, e.g. measuring chemicals for mixing bag prescriptions, control of dyestuff flow and intensive care dosing. It is of course to be understood that the invention is not intended to be restricted to the details of the above embodiment which are described by way of example only.

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

Abstract

L'invention concerne un appareil de mesure de débit (10) particulièrement utile pour mesurer le débit de liquide dans un distributeur automatique de boissons. Cet appareil comprend un passage (11) prévu pour l'écoulement, dans lequel sont fixés des dispositifs (12) formant émetteurs/receveurs directement opposés. En service, ces dispositifs (12) formant émetteurs/récepteurs sont commutés pour passer d'un mode réception à un mode émission dans lesquels ils génèrent, respectivement, des augmentations brusques d'amplitude d'un signal oscillant, c'est-à-dire, d'un signal ultrasonore et reçoivent le signal émis par l'autre dispositif. La différence de plan entre les signaux reçus est mesurée par un circuit de commande (13) et le débit du liquide dans le passage d'écoulement (11) est déterminé à partir de cette différence de plan et peut être affiché au niveau d'une sortie.
PCT/GB1995/000697 1995-03-28 1995-03-28 Appareil de mesure de debit WO1996030724A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU20774/95A AU2077495A (en) 1995-03-28 1995-03-28 Flow measuring apparatus
PCT/GB1995/000697 WO1996030724A1 (fr) 1995-03-28 1995-03-28 Appareil de mesure de debit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1995/000697 WO1996030724A1 (fr) 1995-03-28 1995-03-28 Appareil de mesure de debit

Publications (1)

Publication Number Publication Date
WO1996030724A1 true WO1996030724A1 (fr) 1996-10-03

Family

ID=10768016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/000697 WO1996030724A1 (fr) 1995-03-28 1995-03-28 Appareil de mesure de debit

Country Status (2)

Country Link
AU (1) AU2077495A (fr)
WO (1) WO1996030724A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2431346A1 (de) * 1974-06-29 1976-02-12 Draegerwerk Ag Verfahren und vorrichtung fuer die messung der stroemungsgeschwindigkeit von medien mittels ultraschall
DE2538788A1 (de) * 1975-09-01 1977-03-10 Standard Elektrik Lorenz Ag Anordnung zum bestimmen der masse von in rohrleitungen stroemenden gasen
US4011755A (en) * 1975-10-23 1977-03-15 Panametrics, Inc. Acoustic flowmeter
EP0056137A2 (fr) * 1981-01-13 1982-07-21 The Perkin-Elmer Corporation Système de mesure de débit à amélioration d'équilibrage pour l'énergie ultrasonore
EP0496953A1 (fr) * 1991-01-29 1992-08-05 Landis & Gyr Technology Innovation AG Débitmètre volumique pour fluides
EP0616198A1 (fr) * 1993-03-19 1994-09-21 Landis & Gyr Technology Innovation AG Capteur de débit volumique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2431346A1 (de) * 1974-06-29 1976-02-12 Draegerwerk Ag Verfahren und vorrichtung fuer die messung der stroemungsgeschwindigkeit von medien mittels ultraschall
DE2538788A1 (de) * 1975-09-01 1977-03-10 Standard Elektrik Lorenz Ag Anordnung zum bestimmen der masse von in rohrleitungen stroemenden gasen
US4011755A (en) * 1975-10-23 1977-03-15 Panametrics, Inc. Acoustic flowmeter
EP0056137A2 (fr) * 1981-01-13 1982-07-21 The Perkin-Elmer Corporation Système de mesure de débit à amélioration d'équilibrage pour l'énergie ultrasonore
EP0496953A1 (fr) * 1991-01-29 1992-08-05 Landis & Gyr Technology Innovation AG Débitmètre volumique pour fluides
EP0616198A1 (fr) * 1993-03-19 1994-09-21 Landis & Gyr Technology Innovation AG Capteur de débit volumique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
G.C. APRILESI,E.A.: "ULTRASONIC INSTRUMENTATION: A MICROPROCESSOR-BASED U.S. FLOWMETER", IEEE ULTRASONICS SYMPOSUIM, vol. 1, 14 November 1984 (1984-11-14) - 16 November 1984 (1984-11-16), DALLAS, TAXAS, US, pages 484 - 487 *

Also Published As

Publication number Publication date
AU2077495A (en) 1996-10-16

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