EP1606593A1 - Debitmetre a turbine electronique pour gaz - Google Patents

Debitmetre a turbine electronique pour gaz

Info

Publication number
EP1606593A1
EP1606593A1 EP04715822A EP04715822A EP1606593A1 EP 1606593 A1 EP1606593 A1 EP 1606593A1 EP 04715822 A EP04715822 A EP 04715822A EP 04715822 A EP04715822 A EP 04715822A EP 1606593 A1 EP1606593 A1 EP 1606593A1
Authority
EP
European Patent Office
Prior art keywords
pressure
gas meter
electronic
meter according
turbine
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Withdrawn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
EP04715822A
Other languages
German (de)
English (en)
Inventor
Ralf Schneiderrat
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.)
Imeter BV
Original Assignee
Imeter 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 Imeter BV filed Critical Imeter BV
Publication of EP1606593A1 publication Critical patent/EP1606593A1/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Withdrawn legal-status Critical Current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
    • G01F1/115—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 magnetic or electromagnetic coupling to the indicating device

Definitions

  • the invention relates to an electronic turbine gas meter.
  • Such a turbine wheel gas meter with an exchangeable measuring insert is known, for example, from EP 0 078 334 AI.
  • the measuring principle of a turbine wheel gas meter is that the kinetic energy inherent in the gas flow to be measured is converted into a rotary movement of the turbine wheel by means of a turbine wheel arranged in the flow path of the gas to be measured, the rotation speed of the turbine wheel ideally being proportional to the gas flow to be measured or to measuring gas volume.
  • the rotational speed of the turbine wheel is usually determined by means of a corresponding sensor system.
  • sensors with a radial alignment are assigned to the turbine wheel, for example, in such a way that the passing of the blades of the turbine wheel generates pulses which are fed to a connected electronic state volume corrector.
  • An output from the shaft of the turbine wheel drives a mechanical counter.
  • the upstream or downstream of the counter is usually the volume corrector already mentioned, which corrects the counter based on corresponding calibration data Makes counting result.
  • Such a counter correction is necessary because the quality of the result of the count is initially influenced by a number of mechanical and fluidic factors, such as the frictional losses of the turbine wheel, which increase with increasing wear on the bearing of the turbine wheel.
  • the measurement error is usually greater at low capacities and low gas density, since in this area the drive effect of the gas on the turbine wheel is relatively small compared to the mechanical influencing variables.
  • the counting result also depends on the dimension of the meter, in particular the respective flow forces of the paddle wheel, the viscosity and density of the gas and the respective gas pressure of the gas.
  • the invention has for its object to provide a turbine gas meter that offers a higher measurement accuracy and can be used in a wide range of applications without correspondingly expensive recalibrations, error corrections.
  • the object underlying the invention is achieved according to the features of the main claim.
  • Advantageous embodiments of the invention result from the dependent subclaims 2 to 16.
  • the turbine gas meter has an electronic counter, so far it is rightly referred to as an electronic turbine gas meter, the usual mechanical problems and corrections, which in the Connection with a mechanical roller counter are required.
  • the gas meter is arranged protected within a sensor housing in the flow straightener and thus has an extremely small space requirement.
  • the integrated sensor housing can be retrofitted or replaced if necessary.
  • the sensor housing can be arranged in the flow direction in front of or behind the turbine wheel of the meter.
  • the sensor housing or the counter arranged in it is data-connected to at least one radial sensor which, in contrast to the sensors explained above, does not evaluate the passage of the blades of the turbine wheel, but rather the passage of a special one connected to the turbine wheel and therefore rotating body rotating.
  • the impulses generated by means of a specially designed rotating body can be detected and processed more distinctly and precisely than the impulses usually generated by the passing of the blades of a turbine wheel.
  • the accuracy of the counter can be increased in radial alignment by further sensors, which are arranged on an imaginary circular path, preferably equidistantly.
  • the rotary body is a perforated ring that rotates with the turbine wheel, it being possible for an inductive detection, as here, to either detect and evaluate the passage of the solid material or the holes in the perforated ring as a signal.
  • an inductive detection as here, to either detect and evaluate the passage of the solid material or the holes in the perforated ring as a signal.
  • the sensors can be simple proximity switches, since the rotating body still allows the generation of a high-precision signal.
  • the counter according to the invention can, however, also be provided with a high-quality displacement sensor.
  • At least one axial sensor is also associated with the rotary body connected to the turbine wheel.
  • the rotary body additionally has a disk that rotates with the turbine wheel and has corresponding bores, so that the induction of the disks without contact generates a pulse train density that is proportional to the respective rotational speed of the turbine wheel.
  • the counting result of these axial sensors can be used on the one hand for redundant measurement or error correction.
  • a reversal of the direction of rotation can also be detected in this way.
  • the counter is not only equipped with such a radial or axial sensor, but rather with four sensors arranged equidistantly distributed over the circumference of the ball bearing.
  • the radial and / or axial sensors are designed as analog sensors which generate an analog pulse signal depending on the passage of the rotating body.
  • any unbalance or damage to the ball bearings can be identified depending on their operational wear.
  • the evaluation is in turn carried out within the electronic counter inside the sensor housing of the turbine gas meter.
  • a comparison is made with a predetermined range. If the specified threshold values are exceeded or undershot, a warning message is generated which informs that the ball bearing of the turbine wheel must be replaced or repaired immediately.
  • the evaluation of the analog signal from the radial sensors therefore enables early detection of measurement errors and can therefore be used to prevent any meter failure in good time. Monitoring the wear of the ball bearings represents a further measure to increase the measuring accuracy and the reliability of the meter.
  • any change in the distance between the sensor surface and the rotating body or the turbine wheel connected to it can be detected by evaluating the analog signal of the sensors. It is particularly advantageous if the rotary body has only a few or one bore in the axial and radial directions, since this extends the pulse duration of the signal for evaluation for determining the distance between the rotary body and the axial sensor. In this way, the distance defined above can be determined more precisely than by evaluating pulses which are shorter in time.
  • the pulse signals of the axial sensors are therefore monitored in relation to predetermined threshold values and, if exceeded, an error and / or alarm message is generated.
  • maintenance intervals can also be defined, trends recognized or early warnings given. The evaluation explained above makes it possible to identify any meter errors or even failures early or immediately and, in most cases, also to determine their cause in the form of documentation of any overuse.
  • the sensor housing arranged within the flow rectifier of the meter is designed to be gas-tight, so that the pressure prevailing in the sensor housing is decoupled from the respective gas pressure or operating pressure of the gas to be measured.
  • An atmospheric or slight negative pressure (vacuum) is usually set constant within the gas-tight sensor housing.
  • the turbine wheel gas meter according to the invention is also provided with a pressure meter assigned to the pressure chamber of the turbine wheel for detecting the gas or operating pressure of the gas to be measured. This gas meter is connected to electronic meter data.
  • the pressure meter arranged in the pressure chamber works according to the reliable method of differential pressure measurement.
  • the pressure meter itself is provided with a measuring pressure space, which then supplies the comparison standard for the differential pressure measurement.
  • the respective counter can be assigned to the counter by means of a memory element assigned to the counter, which is also arranged in the sensor housing assigned correction tables or polynomial coefficients can be stored.
  • a memory element assigned to the counter Via the constant monitoring of the operating pressure or the gas pressure of the gas to be measured and the transmission of the respective operating pressure to the electronic counter, an automatic correction of the counting result taking into account the respective gas density or the.
  • the turbine wheel gas meter which has been calibrated for only one operating pressure, can be used on the basis of this automatic error correction in a predetermined range for which the corresponding corrections can be used with the aid of the correction tables or polynomial coefficients that are stored in said storage element.
  • Additional data relevant to the meter such as manufacturer information, measured value curves or calibration data, are created in the memory element of the counter.
  • the storage element can also be used to record measured values over a predefined period of time.
  • the counting result generated in the electronic counter is also secured by an emergency power supply.
  • the electronic counter according to the invention differs from conventional counters in that the data created in the memory element and the operating data recorded in each case are used to automatically correct the counting result.
  • the counting result displayed, stored or recorded is therefore already corrected within the scope of the measurement accuracy to be required.
  • FIG. 1 shows a section of an electronic turbine gas meter in a cross-sectional view
  • 2 shows a detailed view of the function of the radial sensors of the turbine wheel gas meter shown in FIG. 1 in a top view
  • Fig. 3 shows a further detailed view of the function of the radial sensors in an alternative embodiment of the turbine gas meter shown in Fig. 1 in a plan view and
  • FIG. 4 shows a further detailed view of the sensors of the turbine gas meter shown in FIG. 1 on the function of the axial sensors in a plan view
  • Fig. 5 shows the electronic counter of the turbine gas meter shown in Fig. 1 in a block diagram
  • the turbine wheel gas meter 1 shown in FIG. 1 essentially comprises a flow channel 2 through which the gas to be measured flows after being introduced through an inflow structure (not shown further) in the direction of a flow outlet, also not shown here.
  • a turbine wheel 5 with turbine blades 6 is arranged within the flow channel 2.
  • the turbine wheel 5 is mounted on a shaft with two ball bearings 8.
  • a sensor housing 11 is arranged in a fixed flow straightener 10 of the counter 1.
  • the sensor housing 11 is a gas-tight space in which an electronic counter 3 is arranged with a memory element 4 and a processor unit 9.
  • the sensor housing 11 is provided with a sensor head 12 with two axially aligned axial sensors 13 and two radially aligned radial sensors 14, which are arranged on an imaginary circular path within the likewise gas-tight sensor head 12. These are inductive proximity switches which are assigned to a rotating body 15 which rotates with the turbine wheel 5 on the same shaft 7.
  • the rotating body 15 essentially consists of a co-rotating disk 16, the outer circumference of which is delimited by a ring of holes 17 which passes over the radial and axial sensors 13 and 14 at a defined distance.
  • the sensor system of the turbine wheel gas meter 1 shown in FIG. 1 is shown in more detail in the detailed views according to FIGS. 2 and 3.
  • FIG. 2 shows the sensor head 12 with the radially aligned radial sensors 14 in a frontal cross-sectional representation.
  • the sensor head 12 is arranged concentrically with the metallic perforated ring 17 which rotates with the rotating body 15.
  • the ring of holes 17 has two bores 18.
  • the passage of the bores 18 on the inductive radial sensors 14 causes a signal interruption 20, the frequency of which can be evaluated as a signal proportional to the rotational speed of the turbine wheel 5.
  • the radial sensors 14 can also be assigned one or more rotating metal webs 19 which sweep over the stationary radial sensors 14 as they pass.
  • it could also be a plastic rotating body which, in the area of the rotating rim of the hole, adheres to metal strips which sweep over the radial sensors 14 when the turbine wheel rotates.
  • the signal interruptions 20 the density of the pulses 21 can then be evaluated.
  • axially aligned axial sensors 13 are provided in the sensor head 12, to which a co-rotating disk 16 of the rotary body 15 with further bores 18 is assigned, which, analogously to the illustration in FIG. 2, generate a pulse sequence proportional to the rotational speed of the turbine wheel 5.
  • the counter 3 arranged in the sensor housing 11 with the upstream sensor head 12 is shown in FIG. 5 in a block diagram.
  • the sensor head 12 is arranged in a pressure-resistant housing and connected to the sensor housing 11 via a pressure-tight glass bushing 22.
  • a resonant circuit with proximity switch 23 is provided in the sensor head 12 for each sensor 13 or 14.
  • This resonant circuit 23 is connected via an amplifier 24 to a signal adaptation 25 already arranged in the counter housing 11, in particular for analog value preprocessing.
  • the signal processed in this way is then connected to the processor 9, which is usually present in duplicate for reasons of redundancy, with an integrated memory element 4.
  • the counter 3 is in a data connection via an interface adaptation 26 via corresponding further pressure-tight glass bushings 27 with additional electronics arranged outside the turbine wheel gas meter 1, which is not shown further here.
  • the gas to be measured is introduced through an inflow structure into a flow channel 2, in which a turbine wheel 5 is arranged on a shaft 7.
  • the turbine blades 6 of the turbine wheel 5 are set in rotation by the kinetic energy inherent in the gas flowing through.
  • the rotating body 15 is moved past the sensors 13 and 14.
  • the sensors 13 are connected via corresponding contact pins to the electronic counter 3, which is arranged in the sensor housing 11.
  • the sensors 13 and 14 deliver a pulse density corresponding to the passing of the bores 18 of the rotating body 15.
  • a signal which is proportional to the respective gas flow is thus generated, which can be counted by means of the electronic counter 3 and can be converted into a corresponding gas volume to be determined by appropriate conversion.
  • a pressure meter is arranged in the flow channel 2, which works on the principle of differential pressure measurement. The internal pressure of this pressure gauge is used as a comparison standard for the differential pressure measurement.
  • the sensor housing 11 is sealed gas-tight with respect to the rest of the flow channel 2. A vacuum or atmospheric pressure usually prevails in the sensor housing 11.
  • the pressure meter arranged in the flow channel 2 thus supplies the respective gas pressure of the gas to be measured.
  • This gas pressure can be used in conjunction with the correction tables and polynomial coefficients stored in the storage element 4 for the respective counter in order to determine the measurement result after gas pressure adjustment, that is to say the gas volume actually passed through the flow channel 2.
  • the so-called Reynolds correction is carried out automatically in the electronic counter by means of the correction data stored in the storage element 4 and assigned to the counter, taking into account the gas pressure supplied by the pressure meter, and the result of the count is thus corrected automatically.
  • the counter can then be used in a pressure range predetermined on the basis of the pressure sensor used in each case for determining the gas pressure, without further calibrations or recalibrations being necessary would be required.
  • the field of application of the meter is thereby significantly expanded.
  • the turbine sensor 1 can also be adapted to different pressure ranges by replacing the complete sensor housing 11 including the corresponding pressure sensor.
  • the electronic counter is also connected to a number of other sensors, in particular pressure sensors, which transmit further measurement data used for error correction, for example relating to the run-on behavior of the turbine wheel.
  • the sensors of the sensor head 12 are analog sensors, so that a further evaluation of the analog pulse sequence, that is to say in particular of its amplitude with respect to the radial sensors 14, allows conclusions to be drawn about the respective state of the ball bearing 8. In this way, any imbalance or damage to the ball bearing 8 is determined on the basis of the amplitude of the amplitude height of the pulses supplied by the analog sensors 13, 14, which is variable due to the passing of the ring rim 17 rotating with imbalance.
  • the evaluation of the analog signal provides a measurement variable which is proportional to the respective inflow pressure of the turbine wheel 5 and which is logged, for example, in the storage element 4. In this way, it can be recognized whether counter 1 was operated in the permissible range in each case.
  • a turbine wheel gas meter 1 has thus been described above, the measuring accuracy of which is already increased in that, in contrast to conventional turbine wheel gas meters 1, the pulse sequence is not generated by the turbine blades 6 of the turbine wheel 5 passing by. Furthermore, these impulses are transmitted to an electronic counter 3, thus avoiding any mechanical transmission losses.
  • the turbine wheel gas meter 1 offers the advantage that the monitoring of the ball bearing 8 which is exposed to considerable wear and of the inflow pressure acting overall on the turbine wheel 5 and the meter 1 enables preventive early detection of any meter defects.

Landscapes

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

Abstract

L'invention concerne un débitmètre à turbine électronique pour gaz (1), dont le principe de mesure se fonde principalement sur le fait de convertir l'énergie cinétique inhérente au flux gazeux à mesurer, en rotation d'une roue de turbine (5) et d'utiliser sa vitesse de rotation pour déterminer le volume du flux gazeux. Afin de parvenir à une plus grande précision de mesure, il est prévu, dans le cadre de l'invention, d'évaluer, en lieu et place du passage devant les aubes de turbine (6), le passage devant un corps de rotation spécial (15) et éventuellement de prendre en compte, dans chaque cas, la pression gazeuse, par une linéarisation de Reynolds. En outre, l'usure des roulements à billes (8) et la pression d'afflux respective de la roue de turbine (5) sont contrôlées par capteurs.
EP04715822A 2003-03-22 2004-02-28 Debitmetre a turbine electronique pour gaz Withdrawn EP1606593A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10312620 2003-03-22
DE2003112620 DE10312620A1 (de) 2003-03-22 2003-03-22 Elektronischer Turbinenradgaszähler
PCT/DE2004/000374 WO2004085974A1 (fr) 2003-03-22 2004-02-28 Debitmetre a turbine electronique pour gaz

Publications (1)

Publication Number Publication Date
EP1606593A1 true EP1606593A1 (fr) 2005-12-21

Family

ID=32946032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04715822A Withdrawn EP1606593A1 (fr) 2003-03-22 2004-02-28 Debitmetre a turbine electronique pour gaz

Country Status (4)

Country Link
EP (1) EP1606593A1 (fr)
CN (1) CN100387937C (fr)
DE (1) DE10312620A1 (fr)
WO (1) WO2004085974A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2493368A (en) * 2011-08-02 2013-02-06 S R Controls Ltd Validating flow measurement equipment by comparing two separately calculated descriptive statistics
CN108225457A (zh) * 2017-12-01 2018-06-29 连云港水表有限公司 一种用滚珠轴承作为水表传动机构的新结构
CN108982004A (zh) * 2018-07-12 2018-12-11 黄华 一种用于气动输送的差压检验装置
CN112946231B (zh) * 2021-02-04 2022-07-22 成都秦川物联网科技股份有限公司 一种天然气全周期能量计量系统和方法
US11592323B2 (en) 2021-02-04 2023-02-28 Chengdu Qinchuan Iot Technology Co., Ltd. Methods and systems for measuring energy of natural gas in a full cycle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2829866A1 (de) 1978-07-07 1980-01-24 Elster Ag Schraubenradzaehler
DE3612714A1 (de) 1986-04-16 1987-10-22 Kieninger & Obergfell Durchflussmengenmesser
JPH0377019A (ja) 1989-08-18 1991-04-02 Tokico Ltd 流量計
DE3804786C2 (fr) 1988-02-16 1993-07-01 Horst Prof. Dipl.-Phys. Dr. 4790 Paderborn De Ziegler
WO2002073141A2 (fr) 2001-03-08 2002-09-19 Inotech Gmbh Compteur a gaz
DE10153687A1 (de) 2001-10-31 2003-05-15 Elster Gmbh Durchfluss-Messgerät

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Publication number Priority date Publication date Assignee Title
US4305281A (en) * 1979-06-04 1981-12-15 Rockwell International Corporation Self-correcting self-checking turbine meter
JPS5922492Y2 (ja) * 1981-05-29 1984-07-05 株式会社デンソー 流量検出器
US5046369A (en) * 1989-04-11 1991-09-10 Halliburton Company Compensated turbine flowmeter
JPH0748052B2 (ja) * 1990-09-07 1995-05-24 東京瓦斯株式会社 気体用タービンメータ
EP0539561B1 (fr) * 1991-05-14 1995-08-30 TEUNISSEN, Theodora Antonia Debitmetre
US5450760A (en) * 1993-10-18 1995-09-19 Lew; Hyok S. Turbine flowmeter with capacitive transducer
FR2713760B1 (fr) * 1993-12-07 1996-03-08 Schlumberger Ind Sa Procédé et dispositif de surveillance de l'évolution de la valeur courante d'un débit de fluide dans un compteur de fluide.
DE59711348D1 (de) * 1996-04-12 2004-04-08 Hans-Holger Koerner Verbrauchszähler mit magnetischem Impulsgeber
US5866824A (en) * 1997-01-24 1999-02-02 American Meter Company Gas turbine meter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2829866A1 (de) 1978-07-07 1980-01-24 Elster Ag Schraubenradzaehler
DE3612714A1 (de) 1986-04-16 1987-10-22 Kieninger & Obergfell Durchflussmengenmesser
DE3804786C2 (fr) 1988-02-16 1993-07-01 Horst Prof. Dipl.-Phys. Dr. 4790 Paderborn De Ziegler
JPH0377019A (ja) 1989-08-18 1991-04-02 Tokico Ltd 流量計
WO2002073141A2 (fr) 2001-03-08 2002-09-19 Inotech Gmbh Compteur a gaz
DE10153687A1 (de) 2001-10-31 2003-05-15 Elster Gmbh Durchfluss-Messgerät

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "Turbine Meter - A smart preamplifier for real-time turbine meter diagnostics", FMC SMITH METER INC. AMERICAN ENERGY WEEK '95, February 1995 (1995-02-01), HOUSTON, TEXAS, pages 1 - 4, XP003023696
See also references of WO2004085974A1

Also Published As

Publication number Publication date
CN100387937C (zh) 2008-05-14
DE10312620A1 (de) 2004-10-07
WO2004085974A1 (fr) 2004-10-07
CN1791786A (zh) 2006-06-21

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