EP2771650A1 - Compteur à gaz à double turbine - Google Patents

Compteur à gaz à double turbine

Info

Publication number
EP2771650A1
EP2771650A1 EP12805789.0A EP12805789A EP2771650A1 EP 2771650 A1 EP2771650 A1 EP 2771650A1 EP 12805789 A EP12805789 A EP 12805789A EP 2771650 A1 EP2771650 A1 EP 2771650A1
Authority
EP
European Patent Office
Prior art keywords
turbine
gas meter
counters
wheels
wheel
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Withdrawn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
EP12805789.0A
Other languages
German (de)
English (en)
Inventor
Raymond Richards
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.)
Flow Meter Group BV
Original Assignee
Flow Meter Group BV
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 Flow Meter Group BV filed Critical Flow Meter Group BV
Publication of EP2771650A1 publication Critical patent/EP2771650A1/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Withdrawn legal-status Critical Current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
    • G01F1/05—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 using mechanical effects
    • G01F1/10—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 using mechanical effects using rotating vanes with axial admission
    • G01F1/103—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 using mechanical effects using rotating vanes with axial admission with radiation as transfer means to the indicating device, e.g. light transmission

Definitions

  • the invention relates to a turbine gas meter comprising a housing with a gas inlet hole and a gas outlet hole, at least one turbine wheel located in the housing, and a counter connected to the turbine wheel for counting the number of revolutions of the turbine wheel.
  • Turbine gas meters are regularly used measuring instruments for determining quantities of gas. The principle is based on the given that the number of revolutions of the turbine wheel is proportional to the gas flow through the wheel (through the blades). The gas flow rate multiplied by the orifice of the wheel (between the blades) represents the quantity per unit of time. The revolutions of the turbine wheel are transferred to a counting mechanism by means of a transmission (electronically by means of pulses or mechanically by means of gears). In order to create uniformity in the flow between the blades and to avoid the flow obtaining a deviating inlet angle relative to the blades as a result of a shift in the gas flow, a flow straightener is installed in front of the blade wheel.
  • turbine meters are to be checked (recalibrated) on a regular basis, which entails hefty charges because recalibrations are to be executed under comparable conditions (i.e. high-pressure natural gas), and the meter as a whole is to be removed from and reinstalled in the pipe section.
  • comparable conditions i.e. high-pressure natural gas
  • the turbine gas meter according to the invention is characterized in that the turbine gas meter further includes a further turbine wheel as well as a further counter, and an averaging unit 31 connected to the two counters, which averages the values of the two counters.
  • the renewed turbine meter (Fig. 1) concept utilizes two turbine wheels in one meter housing. The signals of both wheels are scaled in a battery-fed processing unit (for example one revolution of the shaft connected to the first wheel equals 0.3564 m and the second wheel 0.40085 m ) and subsequently added up per wheel. For the total readout the sum of the two counting registers is taken and divided by two.
  • the values (overall, per unit of time or per quantity passed) of the individual wheels are compared with each other in a difference determining unit. With this unit it can be ascertained whether the wheels show an error and an alarm can be generated if too large an error has been detected. In the previous example this diagnosis function will detect that there is a 2% difference between the two wheels. As long as the difference is smaller than the maximum permissible error (laid down in various standards and/or regulations) a meter need not be recalibrated and can be continued to be utilized for fiscal purposes.
  • a further embodiment of the turbine gas meter according to the invention is characterized in that reducing means are located between the turbine wheels and the counters.
  • reducing means are located between the turbine wheels and the counters.
  • a still further embodiment of the turbine gas meter according to the invention is characterized in that the processing unit is a battery-fed processing unit. Reducing the number of revolutions is desired for minimizing the energy consumption of the sensors so that the sensors and the signal processing electronics can operate based on the battery supply. In case of a strongly reduced number of revolutions the sensors and the processing electronics can partly remain passive and will not be activated until a complete revolution of the shaft is to be expected. By way of illustration: with a maximum speed of 1 revolution per second the sensors and processing electronics would only have to be briefly activated once a second.
  • the position of the shaft can be determined by means of an encoder system (Fig.
  • Yet a further embodiment of the turbine gas meter according to the invention is characterized in that the turbine wheels have different configurations.
  • the turbine wheels have different configurations.
  • the turbine gas meter further includes two flow straighteners the first one of which being located between the inlet hole and the turbine wheel and the second one of which being located between the two turbine wheels. Since the two wheels are to register mutually independently, the flow is built up again by means of a flow straightener between the two wheels. In front of the first wheel a flow straightener has already been installed for rendering the overall measurement as much as possible insensitive to installation specific flowing profiles and whirling motions which could affect the real measuring behaviour (relative to the calibration). However, the possibility cannot be discounted that extreme disturbances of the flow can nevertheless affect the measuring accuracy in practice.
  • Fig. 1 shows an embodiment of the turbine gas meter according to the invention comprising two measuring wheels
  • Fig. 2 gives a diagrammatic representation of the turbine gas meter shown in
  • Fig. 3 shows a first embodiment of the encoder system of the turbine gas meter
  • Fig. 4 shows a second embodiment of the encoder system of the turbine gas meter. Detailed description of the drawings
  • Fig. 1 shows an embodiment of the turbine gas meter according to the invention.
  • the turbine gas meter 1 comprises a housing 3 provided with a gas inlet hole 5 and a gas outlet hole 7.
  • the housing accommodates two turbine wheels 9 and 11 of different configurations, as well as two flow straighteners 13 and 15, the first one 13 of which flow straighteners is located between the inlet hole 5 and the turbine wheel 9 and the second flow straightener 15 is located between the two turbine wheels 9 and 11.
  • Fig. 2 gives a diagrammatic representation of the turbine gas meter.
  • An encoder disc 21, 22 is coupled to each turbine wheel 9, 11 by means of two worm worm wheel transmissions 17, 18 and 19, 20.
  • the rotation of each encoder disc is sensed by three sensors 23, 24. From this sensed value can be determined both the direction of rotation and the number of revolutions.
  • the turbine gas meter has an electronic processing unit to which sensors are connected.
  • This electronic processing unit comprises two logic units 25, 26, one for each set of sensors 23, 24, which emit a signal which is converted by value determining units 27, 28 into a signal that represents a revolution of the encoder disc.
  • Counters 29, 30 count the number of revolutions of the encoder discs. The values coming from these units are averaged in an averaging unit 31.
  • a difference determining unit 33 determines the difference between the two counters (preferably with a large time interval, for example per hour or per day).
  • Signalling means 35 emit a light signal if the difference exceeds a limit value and the measurement is unreliable.
  • the average value found is output via a communication unit 36 and shown on a display 37.
  • the counters 29, 30 are fed by batteries 39.
  • the turbine gas meter is provided with further encoders 41, 42 which are connected to the turbine wheels and via an interface 43 can be coupled directly to a computer.
  • the encoder discs and sensors may be in the form of an optical or magnetic disc.
  • Fig. 3 shows the optical variant.
  • the encoder disc 21 ' has recesses and is monitored by three optical sensors 23'.
  • Fig. 4 shows the magnetic variant. In this configuration the encoder disc 21" has a permanet magnet 45 which is monitored by coils 23".
  • the two encoder discs will have to be low-speed discs.
  • the speed of the shaft of the encoder disc can be reduced by a factor of 100 to 1000 by means of 2 or 3 worm worm wheel transmissions. Since no torque need be transferred (only a disc is driven), this transmission can be realised in a very compact and cost effective manner.

Landscapes

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

Abstract

La présente invention concerne un compteur à gaz à turbine, comprenant un logement pourvu d'un orifice d'entrée de gaz et d'un orifice de sortie de gaz, deux roues de turbine 9, 11 situées dans le logement et deux compteurs 29, chaque compteur étant connecté à une roue de turbine pour compter le nombre de tours de la roue de turbine. Le compteur à gaz à turbine comprend en outre une unité de traitement connectée aux deux compteurs, qui calcule les moyennes des valeurs des deux compteurs, les compare l'une à l'autre et émet un signal quand la différence dépasse une valeur maximale prédéterminée de différence permise. Des moyens de réduction 17, 19 sont situés entre les roues de turbine et les compteurs, de façon que les compteurs puissent être alimentés par des piles. De préférence, les roues de turbine ont différentes configurations.
EP12805789.0A 2011-10-25 2012-10-25 Compteur à gaz à double turbine Withdrawn EP2771650A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2007651 2011-10-25
PCT/NL2012/050746 WO2013070064A1 (fr) 2011-10-25 2012-10-25 Compteur à gaz à double turbine

Publications (1)

Publication Number Publication Date
EP2771650A1 true EP2771650A1 (fr) 2014-09-03

Family

ID=47428949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12805789.0A Withdrawn EP2771650A1 (fr) 2011-10-25 2012-10-25 Compteur à gaz à double turbine

Country Status (2)

Country Link
EP (1) EP2771650A1 (fr)
WO (1) WO2013070064A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013007871A1 (de) * 2013-05-08 2014-11-13 Rma Mess- Und Regeltechnik Gmbh & Co. Kg Verfahren und Messvorrichtung zur Durchflussmessung eines Gases in einer Rohrleitung mittels eines Turbinenrad-Gaszählers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0841546A2 (fr) * 1996-11-08 1998-05-13 David A. Saar Système de surveillance de structures consommatrices d'eau et de leur consommation de chaleur dans une unité ou un bâtiment comprenant plusieurs unités, et système de tarification s'y rapportant

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710622A (en) * 1971-02-24 1973-01-16 Halliburton Co Viscosity compensated dual rotor turbine flowmeter
US3934473A (en) * 1974-06-12 1976-01-27 Griffo Joseph B Fluid flow meter with counter rotating turbine impellers
US4305281A (en) * 1979-06-04 1981-12-15 Rockwell International Corporation Self-correcting self-checking turbine meter
US4534226A (en) * 1983-11-01 1985-08-13 General Electric Company Counter rotating, multi turbine flow measuring system
US5509305A (en) * 1992-02-12 1996-04-23 Daniel Industries, Inc. Closely coupled, dual turbine volumetric flow meter
US5831176A (en) * 1995-03-24 1998-11-03 The Boeing Company Fluid flow measurement assembly
US6854342B2 (en) * 2002-08-26 2005-02-15 Gilbarco, Inc. Increased sensitivity for turbine flow meter
US7480577B1 (en) * 2007-02-21 2009-01-20 Murray F Feller Multiple sensor flow meter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0841546A2 (fr) * 1996-11-08 1998-05-13 David A. Saar Système de surveillance de structures consommatrices d'eau et de leur consommation de chaleur dans une unité ou un bâtiment comprenant plusieurs unités, et système de tarification s'y rapportant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2013070064A1 *

Also Published As

Publication number Publication date
WO2013070064A1 (fr) 2013-05-16

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