WO2001038832A2 - System for metering fluids - Google Patents

System for metering fluids Download PDF

Info

Publication number
WO2001038832A2
WO2001038832A2 PCT/RO2000/000019 RO0000019W WO0138832A2 WO 2001038832 A2 WO2001038832 A2 WO 2001038832A2 RO 0000019 W RO0000019 W RO 0000019W WO 0138832 A2 WO0138832 A2 WO 0138832A2
Authority
WO
WIPO (PCT)
Prior art keywords
transducer
pressure transducer
temperature
differential pressure
type
Prior art date
Application number
PCT/RO2000/000019
Other languages
French (fr)
Other versions
WO2001038832A3 (en
Inventor
Neculai Agavriloaie
Original Assignee
S.C. Ack S.R.L.
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 S.C. Ack S.R.L. filed Critical S.C. Ack S.R.L.
Publication of WO2001038832A2 publication Critical patent/WO2001038832A2/en
Publication of WO2001038832A3 publication Critical patent/WO2001038832A3/en

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
    • G01F1/34—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 by measuring pressure or differential pressure
    • G01F1/50—Correcting or compensating means
    • 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
    • G01F1/34—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 by measuring pressure or differential pressure
    • G01F1/36—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 by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/363—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 by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction with electrical or electro-mechanical indication
    • 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
    • G01F1/34—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 by measuring pressure or differential pressure
    • G01F1/36—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 by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/37—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 by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels, e.g. by U-tubes
    • G01F1/372—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 by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels, e.g. by U-tubes with electrical or electro-mechanical indication
    • 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
    • G01F1/34—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 by measuring pressure or differential pressure
    • G01F1/36—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 by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/38—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 by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule
    • G01F1/383—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 by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule with electrical or electro-mechanical indication

Definitions

  • the invention refers to an electronic system meant to meter and register the fluids flowing through closed conducts, by using the method of locally reducing the conduct local cross section.
  • metering and register the fluid flow by using the method of locally reducing the conduct cross section there are metering systems with specific transducers and data acquisition systems, controlled by a computer.
  • the present invention eliminates the disadvantages mentioned, by the fact that the system consists of a constriction element mounted in the conduct, of a set of transducers for pressure, differential pressure, temperature of the fluid and compensation temperature, this set of transducers being supplied with electric energy from a battery, through an electronic switch, only for the time of the measurement, the electric voltages occurring on these transducers being multiplexed by an analogic-digital converter, the digital information obtained being then sent to a micro-computer which calculates and integrates the flow rate and displays the values on a LCD, the whole system being electronically switched to a low energy consumption state during the intervals between two consecutive measurements.
  • the invention has following advantages:
  • the systems is based on the method of locally reducing the conduct cross section by using a constriction element (1) mounted in a conduct (2) through which the fluid to be measured is flowing.
  • the system realises the density correction by measuring the pressure and the temperature of the fluid.
  • a transducer set (3) is used, which consists of a pressure transducer (4), a differential pressure transducer (5) and a temperature transducer (6) .
  • the temperature transducer (6) is used to compensate the temperature drift of the pressure transducer (4) and of the differential pressure transducer (5) .
  • the temperature of the fluid flowing through the conduct (2) is measured with a transducer of the type of a thermal resistor (7) .
  • the pressure transducer (4), the differential pressure transducer (5), the temperature transducer (6) and the transducer of the type of a thermal resistor (7) are supplied with electric voltage through an electronic switch (8) only for the duration of the measurement of the parameters in the conduct (2) . For the rest of the time the electronic switch (8) is open.
  • the electric voltages occurring on the outputs of the pressure transducer (4), the differential pressure transducer (5) the temperature transducer (6) and the transducer of the type of a thermal resistor (7) are multiplexed in a multiplexing system (9) and sent to the input of an high resolution analogic-digital converter (10) .
  • the analogic- digital converter (10) uses as reference voltage a fraction of the supply voltage of the pressure transducer (4), the differential pressure transducer (5), the temperature transducer (6) and the transducer of the type of a thermal resistor (7).
  • the digital form of the voltages converted by the analogic-digital converter (10) is sent to a microcomputer (11).
  • the microcomputer (11) makes the calculation of the flow rate through the conduct (2), depending of the measured values, as well as their registration.
  • the microcomputer (11) makes complete calculations at certain time intervals. During the intervals between two consecutive calculations, the microcomputer (11) goes to a low energy consumption state. Also with a view of optimising energy consumption, the microcomputer (11) puts also the other elements of the system into a low energy consumption state, as long as they are not in use.
  • the characteristics of the pressure transducer (4), of the differential pressure transducer (5), of the temperature transducer (6) and of the transducer of the type of a thermal resistor (7), as well as other data about the metering system are stored in a memory circuit (12) to which the microcomputer (11) has access.
  • the different measured data can be made available on a LCD (13) and can also be made remotely readable, by means of a digital interface (14).
  • the electric energy necessary to operate the system is given by a battery (15), whose voltage is regulated by a voltage stabiliser (16) .

Landscapes

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

Abstract

The invention refers to an electronic system meant to meter and register the fluids flowing through closed conducts. The system uses the method of locally reducing the conduct local cross section. In order to reduce the electric energy consumption and to have a simple construction, a direct interface with the pressure, differential pressure and temperature transducers. The whole system is controlled by a microcomputer, which switches the elements of the systems in a low electric energy consumption state while they are not in use.

Description

System for metering fluids
Technical field
The invention refers to an electronic system meant to meter and register the fluids flowing through closed conducts, by using the method of locally reducing the conduct local cross section.
Previous techniques
For the purpose of metering and register the fluid flow by using the method of locally reducing the conduct cross section there are metering systems with specific transducers and data acquisition systems, controlled by a computer.
There are also metering systems where the transducers are connected directly to the data acquisition system.
Their disadvantage consists in the high consumption of electric energy, necessary to operate them, as well in the complexity of their construction.
Disclosure of the invention
The present invention eliminates the disadvantages mentioned, by the fact that the system consists of a constriction element mounted in the conduct, of a set of transducers for pressure, differential pressure, temperature of the fluid and compensation temperature, this set of transducers being supplied with electric energy from a battery, through an electronic switch, only for the time of the measurement, the electric voltages occurring on these transducers being multiplexed by an analogic-digital converter, the digital information obtained being then sent to a micro-computer which calculates and integrates the flow rate and displays the values on a LCD, the whole system being electronically switched to a low energy consumption state during the intervals between two consecutive measurements. The invention has following advantages:
- low electric energy consumption; construction simplicity, with a high measurement accuracy;
- energetic independence.
Summary presentation of the drawings
We give further an example of realising the invention, in connection with fig. 1, which represents the diagram of a metering and registering system for fluids.
Preferred mode of realising the invention
The systems is based on the method of locally reducing the conduct cross section by using a constriction element (1) mounted in a conduct (2) through which the fluid to be measured is flowing. The system realises the density correction by measuring the pressure and the temperature of the fluid. To measure the pressure a transducer set (3) is used, which consists of a pressure transducer (4), a differential pressure transducer (5) and a temperature transducer (6) . The temperature transducer (6) is used to compensate the temperature drift of the pressure transducer (4) and of the differential pressure transducer (5) .
The temperature of the fluid flowing through the conduct (2) is measured with a transducer of the type of a thermal resistor (7) . In order to optimise the energy consumption, the pressure transducer (4), the differential pressure transducer (5), the temperature transducer (6) and the transducer of the type of a thermal resistor (7) are supplied with electric voltage through an electronic switch (8) only for the duration of the measurement of the parameters in the conduct (2) . For the rest of the time the electronic switch (8) is open.
The electric voltages occurring on the outputs of the pressure transducer (4), the differential pressure transducer (5) the temperature transducer (6) and the transducer of the type of a thermal resistor (7) are multiplexed in a multiplexing system (9) and sent to the input of an high resolution analogic-digital converter (10) . The analogic- digital converter (10) uses as reference voltage a fraction of the supply voltage of the pressure transducer (4), the differential pressure transducer (5), the temperature transducer (6) and the transducer of the type of a thermal resistor (7). The digital form of the voltages converted by the analogic-digital converter (10) is sent to a microcomputer (11). The microcomputer (11) makes the calculation of the flow rate through the conduct (2), depending of the measured values, as well as their registration.
The microcomputer (11) makes complete calculations at certain time intervals. During the intervals between two consecutive calculations, the microcomputer (11) goes to a low energy consumption state. Also with a view of optimising energy consumption, the microcomputer (11) puts also the other elements of the system into a low energy consumption state, as long as they are not in use.
The characteristics of the pressure transducer (4), of the differential pressure transducer (5), of the temperature transducer (6) and of the transducer of the type of a thermal resistor (7), as well as other data about the metering system are stored in a memory circuit (12) to which the microcomputer (11) has access.
The different measured data can be made available on a LCD (13) and can also be made remotely readable, by means of a digital interface (14).
The electric energy necessary to operate the system is given by a battery (15), whose voltage is regulated by a voltage stabiliser (16) .

Claims

1. System designed to register fluids based on the method of locally reducing the conduct local cross section, wherein a correction for the density of the fluid flowing through the conduct (2) is realised, by using a transducer unit (3) consisting of a pressure transducer (4), a differential pressure transducer (5) and a temperature transducer (6), which is used to compensate the thermal drift of the pressure transducer (4) and of the differential pressure transducer (5), the temperature being measured by a transducer of the type of a thermal resistor (7), all being supplied with electric voltage by means of an electronic switch (8) from a battery (15) only for the time of the measurement, the voltages occurring at the outputs of the pressure transducer (4), of the differential pressure transducer (5), of the temperature transducer (6) and of the transducer of the type of a thermal resistor (7) are multiplexed by means of an multiplexing system (9) and sent to the input of an analogic-digital converter (10), the digital form of these voltages being sent to a micro-computer (11), which calculates and registers the flow rate at specific time intervals; between the measurements the system being in a low energy consumption state, the measured values being made available on a display (13) or remotely, by using the digital interface (14) .
2. System designed to register fluids according to claim no. 1, wherein for linearisation and temperature compensation, the characteristics of the pressure transducer (4), of the differential pressure transducer (5), of the temperature transducer (6) and of the transducer of the type of a thermal resistor (7), of the multiplexing system (9) and the anagogic-digital converter (10) are stored in a memory circuit (12) to which the micro-computer (11) has access.
PCT/RO2000/000019 1999-11-24 2000-11-14 System for metering fluids WO2001038832A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RO99-01245A RO118150B1 (en) 1999-11-24 1999-11-24 System for metering the fluid flow
RO99-01245 1999-11-24

Publications (2)

Publication Number Publication Date
WO2001038832A2 true WO2001038832A2 (en) 2001-05-31
WO2001038832A3 WO2001038832A3 (en) 2001-11-15

Family

ID=20107455

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RO2000/000019 WO2001038832A2 (en) 1999-11-24 2000-11-14 System for metering fluids

Country Status (2)

Country Link
RO (1) RO118150B1 (en)
WO (1) WO2001038832A2 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1467178A2 (en) * 2003-04-07 2004-10-13 Murata Manufacturing Co., Ltd. Capacitance-sensing vibratory gyro and method for detecting change in capacitance
WO2011055254A1 (en) 2009-11-09 2011-05-12 Koninklijke Philips Electronics N.V. Flow sensing device with temperature compensation
WO2011055253A1 (en) 2009-11-09 2011-05-12 Koninklijke Philips Electronics N.V. Flow sensing method with temperature compensation
WO2014210380A1 (en) * 2013-06-28 2014-12-31 Carefusion 303, Inc. Modular flow cassette
WO2014210382A1 (en) * 2013-06-28 2014-12-31 Carefusion 303, Inc. Flow sensor
US9433743B2 (en) 2013-06-28 2016-09-06 Carefusion 303, Inc. Ventilator exhalation flow valve
US9541098B2 (en) 2013-06-28 2017-01-10 Vyaire Medical Capital Llc Low-noise blower
EP3133299A1 (en) * 2015-08-20 2017-02-22 Sanyo Denki Co., Ltd. Measurement device
US9795757B2 (en) 2013-06-28 2017-10-24 Vyaire Medical Capital Llc Fluid inlet adapter
US9962514B2 (en) 2013-06-28 2018-05-08 Vyaire Medical Capital Llc Ventilator flow valve
CN115291949A (en) * 2022-09-26 2022-11-04 中国人民解放军国防科技大学 Accelerated computing device and accelerated computing method for computational fluid dynamics

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4799169A (en) * 1987-05-26 1989-01-17 Mark Industries, Inc. Gas well flow instrumentation
US5469749A (en) * 1991-09-20 1995-11-28 Hitachi, Ltd. Multiple-function fluid measuring and transmitting apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4799169A (en) * 1987-05-26 1989-01-17 Mark Industries, Inc. Gas well flow instrumentation
US5469749A (en) * 1991-09-20 1995-11-28 Hitachi, Ltd. Multiple-function fluid measuring and transmitting apparatus

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1467178A2 (en) * 2003-04-07 2004-10-13 Murata Manufacturing Co., Ltd. Capacitance-sensing vibratory gyro and method for detecting change in capacitance
CN102686987B (en) * 2009-11-09 2016-01-27 皇家飞利浦电子股份有限公司 There is the stream method for sensing of temperature compensation
WO2011055254A1 (en) 2009-11-09 2011-05-12 Koninklijke Philips Electronics N.V. Flow sensing device with temperature compensation
WO2011055253A1 (en) 2009-11-09 2011-05-12 Koninklijke Philips Electronics N.V. Flow sensing method with temperature compensation
CN102597719A (en) * 2009-11-09 2012-07-18 皇家飞利浦电子股份有限公司 Flow sensing device with temperature compensation
CN102686987A (en) * 2009-11-09 2012-09-19 皇家飞利浦电子股份有限公司 Flow sensing method with temperature compensation
AU2010316726B2 (en) * 2009-11-09 2014-06-05 Koninklijke Philips Electronics N.V. Flow sensing device with temperature compensation
US9983039B2 (en) 2009-11-09 2018-05-29 Koninklijke Philips N.V. Flow sensing device with temperature compensation
CN102597719B (en) * 2009-11-09 2016-01-20 皇家飞利浦电子股份有限公司 There is the fluid sensing apparatus of temperature compensation
WO2014210380A1 (en) * 2013-06-28 2014-12-31 Carefusion 303, Inc. Modular flow cassette
US9962514B2 (en) 2013-06-28 2018-05-08 Vyaire Medical Capital Llc Ventilator flow valve
US9541098B2 (en) 2013-06-28 2017-01-10 Vyaire Medical Capital Llc Low-noise blower
US10549063B2 (en) 2013-06-28 2020-02-04 Vyaire Medical Capital Llc Modular flow cassette
US9707369B2 (en) 2013-06-28 2017-07-18 Vyaire Medical Capital Llc Modular flow cassette
US9746359B2 (en) 2013-06-28 2017-08-29 Vyaire Medical Capital Llc Flow sensor
US9795757B2 (en) 2013-06-28 2017-10-24 Vyaire Medical Capital Llc Fluid inlet adapter
US9433743B2 (en) 2013-06-28 2016-09-06 Carefusion 303, Inc. Ventilator exhalation flow valve
US9962515B2 (en) 2013-06-28 2018-05-08 Carefusion 303, Inc. Ventilator exhalation flow valve
WO2014210382A1 (en) * 2013-06-28 2014-12-31 Carefusion 303, Inc. Flow sensor
US10539444B2 (en) 2013-06-28 2020-01-21 Vyaire Medical Capital Llc Flow sensor
US10495112B2 (en) 2013-06-28 2019-12-03 Vyaire Medical Capital Llc Low-noise blower
US10036660B2 (en) 2015-08-20 2018-07-31 Sanyo Denki Co., Ltd. Measurement device having variable opening orifice for measuring airflow volume and ventilation resistance of wind blowing apparatus
EP3133299A1 (en) * 2015-08-20 2017-02-22 Sanyo Denki Co., Ltd. Measurement device
CN115291949A (en) * 2022-09-26 2022-11-04 中国人民解放军国防科技大学 Accelerated computing device and accelerated computing method for computational fluid dynamics

Also Published As

Publication number Publication date
RO118150B1 (en) 2003-02-28
WO2001038832A3 (en) 2001-11-15

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