EP4237803A1 - Dispositif de mesure pour le dosage de fluides, et procédé de dosage au moyen d'un dispositif de mesure de ce type - Google Patents

Dispositif de mesure pour le dosage de fluides, et procédé de dosage au moyen d'un dispositif de mesure de ce type

Info

Publication number
EP4237803A1
EP4237803A1 EP21830586.0A EP21830586A EP4237803A1 EP 4237803 A1 EP4237803 A1 EP 4237803A1 EP 21830586 A EP21830586 A EP 21830586A EP 4237803 A1 EP4237803 A1 EP 4237803A1
Authority
EP
European Patent Office
Prior art keywords
dosing
line
measuring device
fluid
unit housing
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.)
Pending
Application number
EP21830586.0A
Other languages
German (de)
English (en)
Inventor
Wolfgang Sailer
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.)
AVL List GmbH
Original Assignee
AVL List GmbH
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 AVL List GmbH filed Critical AVL List GmbH
Publication of EP4237803A1 publication Critical patent/EP4237803A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
    • G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/12—Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • 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
    • G01F1/68—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 thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
    • 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
    • G01F1/74—Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8427—Coriolis or gyroscopic mass flowmeters constructional details detectors
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
    • G01F1/90—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with positive-displacement meter or turbine meter to determine the volume flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/005—Valves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/04—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls
    • G01F3/06—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising members rotating in a fluid-tight or substantially fluid-tight manner in a housing
    • G01F3/10—Geared or lobed impeller meters
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means
    • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
    • G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
    • G05D7/0688—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by combined action on throttling means and flow sources

Definitions

  • the invention relates to a measuring device for dosing fluids with a container in which the fluid is stored, a fluid inlet which is fluidly connected to the container, a fluid outlet which is fluidly connected to a dosing point, a dosing line via which the fluid inlet is connected to the fluid outlet, and in which a feed pump, a density sensor and a flow meter are arranged, and with a return line, which branches off from the dosing line downstream of the flow meter and opens into the container, and a method for dosing with such a measuring device.
  • Such measuring devices are used, for example, for oil consumption measurements on test benches for internal combustion engines, with the consumption measurements being able to be carried out both on engines from the automotive sector and on large engines.
  • the challenge with these measuring devices is that it must be possible to measure small amounts of oil of around 10g to be replenished with an accuracy of around 1g and, on the other hand, to be able to fill a complete oil pan with a measurement uncertainty of 1%, as is the case, for example is necessary for a test stand preparation or an oil pan calibration procedure.
  • the required accuracies must also be observed when vibrations occur.
  • a device for measuring fluid consumption is known from EP 1 729 100 A1.
  • This includes a continuously operating flow sensor, a pressure regulator and a winningpump pe, which are arranged in a metering line, and a return line for returning the fluid to the container and a conditioning device that at least one heat exchanger, which is used to generate an average temperature of the fluid and to stabilize the energy in the measuring circuit.
  • the outlay on equipment is relatively high, so that a large amount of space is required. This is undesirable above all because this device must be arranged in the immediate vicinity of the engine in order to avoid measurement errors due to temperature gradients between the flow sensor and the internal combustion engine, since otherwise metering errors are caused due to the thermal expansion of the fluid in the metering line.
  • the task is therefore to create a measuring device for dosing fluids and a corresponding method with which both small quantities of fluid that are redosed and large quantities with high throughputs can be measured with a high level of accuracy.
  • the space requirement in the vicinity of the dosing point m should be minimized.
  • it is desirable that the measurement accuracy is maintained even during longer pauses or changes in the ambient temperature. The manufacturing costs should nevertheless be reduced.
  • the measuring device has a container in which the fluid, such as oil, is stored.
  • a fluid inlet is connected to the container, while a fluid outlet can be fluidically connected to a dosing point, which can be a consumer, such as an internal combustion engine, but can also be an oil pan.
  • a dosing line is located between the fluid inlet and the fluid outlet, in which a feed pump, a density sensor and a flow meter are arranged are.
  • a return line branches off the metering line downstream of the flow meter and empties into the reservoir so that the fluid can be recirculated between measurements.
  • the flow meter is arranged in a measuring unit housing.
  • the pump unit housing is detachably connected to the measuring unit housing via a connecting section of the metering line, so that the fluid can flow from the pump unit housing into the measuring unit housing via this connecting section.
  • the container which can take up a lot of space depending on the measurement to be made, and the pump unit housing can be arranged accordingly in another room or at any position at a distance from the measuring unit housing.
  • Coriolis meters can be used as flow meters, but because of their small cross-sections they produce a greater pressure loss and are therefore usually replaced by volumetric displacement meters in the case of highly viscous fluids, where the temperature and density must be measured to convert them into a mass flow.
  • the object is also achieved by a method in which, before dosing, the fluid is circulated via the return line, with the fluid being removed in the lower area of the container and returned in the upper area of the container.
  • This flushing process equalizes the temperature over the entire circuit. This means that changes in temperature of the fluid over time are significantly reduced during the measurement, which also means that the Density changes otherwise resulting from this are eliminated and/or at least slowed down and minimized, which could lead to measurement errors. Temperature changes during the following measurements only occur very sluggishly.
  • the density sensor is preferably arranged in the pump unit housing downstream of the feed pump in the metering line. This serves in particular to convert a volume flow into a mass flow.
  • the density meter is arranged in the pump unit housing, the base density measured by the density meter is converted into the actual medium density at the flow meter using a known thermal expansion coefficient that is dependent on the fluid, for which the temperature prevailing there must be known.
  • a filter is arranged in the feed pump housing upstream of the feed pump in the metering line, which filter serves to filter out dirt from the fluid and which prevents damage to the density sensor, the flow meter or the feed pump.
  • a non-return valve is arranged in the measuring unit housing upstream of the flow meter in the dosing line, which prevents the fluid from flowing back through the flow meter, which can lead to measurement errors.
  • a temperature sensor is arranged in the measuring unit housing directly downstream of the flow meter in the dosing line.
  • the temperature sensor is used to calculate the correct density of the fluid when converting a volume flow into a mass flow.
  • a choke is also placed downstream of the flow meter and protects it from damage or malfunction due to excessive flow applied pressure differences, which are limited to permissible values by the throttle.
  • a shut-off valve is also arranged in front of the fluid outlet, and the line between the fluid outlet and the shut-off valve should be as short as possible.
  • the shut-off valve is closed when there is flow through the return line and between measurements in order to be able to separate the measuring unit from the dosing point.
  • a fluid return valve should be arranged in the return line in order to be able to shut off the return line during the measurements.
  • a differential pressure sensor which measures a differential pressure across the flow meter, is preferably arranged on the dosing line in the measuring unit housing.
  • the differential pressure sensor ensures that the pressure loss in the flow meter does not become too great.
  • the throttle can be readjusted accordingly if the pressure differential is too high.
  • the differential pressure sensor can be used to also record the respective differential pressures on the flow meter, which depend on the viscosity of the measurement medium, when calibrating the flow meter with different flow rates. If this calibration is repeated with several media of different viscosity, then (particularly when using a volumetric displacement meter) the measurement accuracy can subsequently be improved during a measurement process by including this calibration data in the event of any changes in the viscosity of the measurement medium.
  • the density sensor in the pump unit housing can advantageously be bypassed via a shut-off device.
  • a density sensor occurring undesirably high pressure loss which can occur especially when measuring highly viscous fluids, can be eliminated from the measuring circuit.
  • the delivery pump can be bypassed via a proportional valve, since in this way the delivery flow in the metering line can be adjusted by changing the flow resistance in this bypass line. This is necessary above all in order to reduce the volume flow before the end of a batch dosing and thus to be able to set an exact dosing quantity.
  • the delivery pump can be bypassed via a safety valve. This serves to protect the downstream components and hose lines from excessive pressure.
  • the return line preferably branches off geodetically upwards from the metering line downstream of the flow meter. Air bubbles that are between the flow meter and the branch of the return line at the start of dosing are thus discharged upwards in the direction of the return line due to the lower density instead of being conveyed in the direction of the dosing point, where they would lead to large measurement errors. During the following flushing processes, these air bubbles are reliably discharged to the container.
  • the dosing line extends behind the flow meter in a descending direction, so that air bubbles are also discharged from this area of the dosing line into the return line and erroneous measurements are avoided.
  • the dosing line extends upwards from the fluid outlet, in which case it extends upwards Section of the metering line, the shut-off valve and the throttle are arranged. In this way, air bubbles can be reliably discharged from the entire area between the junction of the return line and the fluid outlet.
  • the dosing line extends steadily increasing from the fluid outlet into the return line to the fluid return valve. This constant training ensures that any air bubbles that are present actually get into the return line and can thus be removed from the system during the flushing process.
  • the continuously rising section of the dosing line is made of a material with a thermal conductivity coefficient of more than 30W/mK and is thermally insulated. Due to this good heat conduction on the dosing line and the simultaneous insulation to the outside, the heat of the fluid in the system during a flushing process is also transferred to the area that is not flushed through, in which the throttle and the shut-off valve are arranged. In this way, temperature differences between this section of the dosing line and the rest of the dosing line, which could lead to measurement errors, can be eliminated or at least significantly reduced.
  • the flow meter is a Coriolis flow meter or a volumetric displacement meter.
  • a mass flow can be determined directly and without additional calculation steps. However, this causes increased pressure losses due to narrow line cross-sections, especially with high viscosities of the measuring fluid.
  • a rotary displacement meter is used, the measured volume flow of which can also be converted into a mass flow via the density and also provides precise measured values.
  • the throttle is advantageously designed as a sleeve introduced into the metering line to narrow the cross section.
  • the sleeve has the throttling function to reduce the pressure difference across the flow meter and to reduce the flow cross section, which means that the temperature in the area of the throttle is quickly adjusted to the temperature of the flushed line section of the metering line he follows.
  • the fluid return valve is opened before metering and the shut-off valve in the metering line in the measuring unit housing is closed.
  • the fluid is then conveyed in a circuit by the feed pump until the temperature of the fluid at the temperature sensor is approximately constant. This means that the entire system adapts to an average temperature of the fluid due to the circulating fluid.
  • the feed pump is then switched off and the fluid return valve is closed.
  • the shut-off valve is opened for dosing and measuring the mass flow, so that the feed pump delivers the fluid to the dosing point, while the mass flow is measured via the flow meter.
  • a measuring device for dosing fluids and a method for dosing fluids with such a measuring device are thus created, with which errors caused by temperature differences in the system are significantly reduced by temperature compensation in the system. Nevertheless, it is possible to place the measuring unit close to the dosing point with little space requirement, while the container with the fluid and the pump unit can be set up at a greater distance. In this way, the space requirement on the test stand is minimized and measurement errors due to temperature differences between the measuring point and the dosing point avoided. Measurement errors caused by dosing lines leading to a dosing point with fluid in them are excluded. In this way, very precise measured values can be achieved with a simple and inexpensive structure.
  • the figure shows a flow diagram of a measuring device according to the invention.
  • the measuring device has a container 10 in which the fluid to be metered is stored.
  • a container 10 in which the fluid to be metered is stored.
  • This can be, for example, an oil pan that provides oil to a dosing point 11, such as a large internal combustion engine on a test stand, with the oil consumption being measured.
  • a fluid inlet 12 into a metering line 13 .
  • This section of the metering line 13 is designed as a hose line and is connected via a hose coupling 14 to a pump unit housing 16 in which the metering line 13 continues.
  • a filter 18 is arranged in the metering line 13, through which solids are separated from the fluid flow.
  • This metering line leads further to a winningpum pe 20, through which the fluid is conveyed from the container 10 and through the metering line 13.
  • the feed pump 20 can be bypassed either via a proportional valve 22 or a safety valve 24 .
  • the safety valve 24 protects the lines, components and couplings of the measuring device from closing high pressures by the safety valve 24 opens when the pressure is too high, causing the pump pressure of the randomlypum pe 20 falls.
  • a density sensor 26 is also arranged in the metering line 13 in the pump unit housing 16 and is used to measure the density of the fluid in order to convert a volume flow into a mass flow. This density depends on the temperature, so that the density measured by the density sensor 26 must be converted to an actual density in the area of a volume flow measurement, depending on the temperature present there.
  • a bypass line 30 bypassing the density sensor 26 is provided, in which a shut-off device 28 is arranged so that the Bypass line 30 can be opened or closed, with opening of the bypass line 30, the flow in the metering line 13 and the metering point 1 1 is increased.
  • the feed pump 20 with the filter 18 and the density sensor 26 and the valves 22, 24, 28 and bypass lines 25, 30 described form a pump unit 32 in the present embodiment, which is arranged in the pump unit housing 16.
  • the dosing line 13 Downstream of the density sensor 26 m, the dosing line 13 first ends at a further hose coupling 14 provided on the pump unit housing 16.
  • a connecting section 33 of the dosing line 13 is attached to this according to the invention, with any other coupling also being possible within the meaning of the invention.
  • This connecting section leads to a further hose coupling 14, which is fixed to a measuring unit housing 34, so that the pump unit housing 16 and the measuring unit housing 34 can be arranged at any desired distance from one another.
  • the dosing line 13 continues accordingly in the measuring unit housing.
  • a non-return valve 36 is arranged upstream of a flow meter 38, which prevents fluid from flowing in the reverse direction through the flow meter 38.
  • this can be designed as a Coriolis flow meter or a volumetric displacement meter such as a gear, oval wheel or screw spindle meter.
  • a differential pressure sensor 40 can be arranged in a pressure line 41 surrounding the flow meter 38, via which the pressure drop across the flow meter 38 can be determined accordingly defined value must not be exceeded.
  • an adjustable throttle 44 is arranged downstream of the flow meter 38 in the measuring unit housing 34 in the dosing line 13, via which the pressure drop across the flow meter 38 can be adjusted depending on the measured values of the differential pressure sensor 40.
  • Temperature sensor 42 is arranged via which the fluid temperature is measured which is used both to assess whether there is an approximately uniform temperature distribution in the entire measuring device and to be able to correct the density to calculate a mass flow.
  • a shut-off valve 46 is also arranged in the metering line 13 downstream of the throttle 44 in front of a fluid outlet 48 via which the connection to the metering point is established.
  • the shut-off valve 46 serves to be able to separate the measuring device from the dosing point 11 fluidically.
  • a return line 50 branches off from the dosing line 13 between the flow meter 38 and the throttle 44, in which a fluid return valve 52 is arranged, which is designed as a switching valve so that the return line 50 can be released or closed.
  • the return line 50 leads via a connecting section 54 between the measuring unit housing 34 and the pump unit housing 16 into the pump unit housing and ends downstream of the pump unit housing in an upper region of the container 10.
  • the connection of the individual line sections inside and outside of the pump unit housing 16 and the measuring unit housing 34 takes place again via hose couplings 14, with any other connections of the power sections being conceivable here as well.
  • the flow meter 38 with its pressure line 41, the check valve 36, the throttle 44, the shut-off valve 46, the fluid return valve 52 and the temperature sensor 42 form a measuring unit 56 which is arranged in the common measuring unit housing 34 and which requires little installation space and can be arranged in the immediate vicinity of the dosing point 11.
  • a downstream section 49 of the dosing line 13 extends continuously upwards from the fluid outlet 48 via the shut-off valve 46 and via the throttle 44 to the return line 50 in the measuring unit housing 34 . This section 49 should also be placed as close to the flow meter 38 as possible.
  • a rinsing process is carried out before each metering.
  • the shut-off valve 46 is closed and the fluid return valve 52 is opened.
  • the fluid is then circulated out of the container via the metering line 13 and the return line 50 and fed back into the container 10 via the pump unit 32 and the measuring unit 56, whereby the gas bubbles are initially removed from the section of the return line 50 upstream of the fluid return valve 52 into the container 10 and can thus no longer falsify measurements.
  • this promotion has the consequence that a temperature equalization takes place between the various sections of the metering line 13, the container 10 and the return line 50, since the supply in the upper area of the container 10 and the discharge from the lower area of the container 10 and the uniform flow through all line sections sets an average temperature which is independent of the distance from the container 10 to the pump unit 32 and the pump unit 32 to the measuring unit 56 and which can be measured by the temperature sensor 42, so that dosing, if desired, only begins when the temperature differences move within a specified interval over a defined period of time. As soon as this is the case, the feed pump PE 20 is first issued, and the fluid return valve 52 is closed.
  • the delivery pump 20 is switched on again and the shut-off valve 46 is opened, so that the fluid is now delivered from the container 10 via the delivery pump 20 and the flow meter 38 to the fluid outlet and thus to the metering point. This also ensures that the entire mass flow takes place exclusively via the metering line 13 .
  • the flow meter 38 measures the mass flow or volume flow that is conducted via it and thus supplied to the dosing point 11, which can be converted into a mass flow using the determined density.
  • the temperature of the fluid remains largely constant, so that very precise measurement results can be achieved. Errors caused by a distance and any associated temperature difference between the flow meter 38 and the dosing point 11 are also avoided, since the measuring unit 56 can be arranged in the immediate vicinity of the dosing point 11 without requiring more space than the pump unit 32 and the container 10 can be arranged at a distance of several meters from the measuring unit 56, since the measuring device is divided into different units which are only connected to one another by detachable lines. With such a measuring device, both large and small dosing quantities can be determined very precisely. The measuring accuracy is maintained even with longer pause times or changed ambient temperatures. Nevertheless, this structure is very inexpensive, since few components are required. For example, heat exchangers for establishing temperature equilibrium can be dispensed with.
  • the density sensor can also be arranged at any position or in an additional bypass line.
  • the return line can also be routed outside the pump unit housing, so that the container can be connected directly to the measuring unit.
  • a narrowing of the cross-section can be used by inserting a sleeve to reduce the pressure difference at the flow meter.
  • a throttle can also be dispensed with if necessary, particularly in the case of volumetric displacement meters.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Automation & Control Theory (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne des dispositifs de mesure pour le dosage de fluides, comprenant : un récipient (10) dans lequel est stocké un fluide ; une entrée de fluide (12) en communication fluidique avec le récipient (10) ; une sortie de fluide (48) qui peut être reliée fluidiquement avec un point de dosage (11) ; une conduite de dosage (13) qui permet de relier l'entrée de fluide (12) à la sortie de fluide (48), et qui comprend une pompe d'alimentation (20), un capteur de densité (26), et un débitmètre (38) ; et une conduite de retour (50) qui part de la conduite de dosage (13) en aval du débitmètre (38) et qui débouche dans le récipient (10). Selon l'invention, afin d'obtenir d'une part des résultats de mesure précis et d'autre part de réduire au minimum les besoins en termes d'espace au niveau du point de dosage (11) tout en proposant un équipement simple, le débitmètre (38) est situé dans un boîtier d'unité de mesure (34) qui est disposé à distance d'un boîtier d'unité de pompe (16) dans lequel est disposée au moins une pompe d'alimentation (20), le boîtier d'unité de pompe (16) et le boîtier d'unité de mesure (34) étant reliés de manière détachable par l'intermédiaire d'une section de liaison (33) de la conduite de dosage (13).
EP21830586.0A 2020-11-11 2021-11-10 Dispositif de mesure pour le dosage de fluides, et procédé de dosage au moyen d'un dispositif de mesure de ce type Pending EP4237803A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50974/2020A AT524206B1 (de) 2020-11-11 2020-11-11 Messvorrichtung zur Dosierung von Fluiden sowie Verfahren zur Dosierung mit einer derartigen Messvorrichtung
PCT/AT2021/060425 WO2022099340A1 (fr) 2020-11-11 2021-11-10 Dispositif de mesure pour le dosage de fluides, et procédé de dosage au moyen d'un dispositif de mesure de ce type

Publications (1)

Publication Number Publication Date
EP4237803A1 true EP4237803A1 (fr) 2023-09-06

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EP21830586.0A Pending EP4237803A1 (fr) 2020-11-11 2021-11-10 Dispositif de mesure pour le dosage de fluides, et procédé de dosage au moyen d'un dispositif de mesure de ce type

Country Status (5)

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US (1) US20240003727A1 (fr)
EP (1) EP4237803A1 (fr)
CN (1) CN116648603A (fr)
AT (1) AT524206B1 (fr)
WO (1) WO2022099340A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT525901B1 (de) * 2022-04-19 2023-09-15 Avl List Gmbh Massenstromregelsystem zur Dosierung von Fluiden sowie Verfahren zur Dosierung von Fluiden mit einem derartigen Massenstromregelsystem

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6708710B1 (en) * 1997-10-30 2004-03-23 Rpm Industries, Inc. Vehicle fluid change apparatus and method
US6471487B2 (en) * 2001-01-31 2002-10-29 Micro Motion, Inc. Fluid delivery system
AT7888U3 (de) 2005-05-27 2006-07-15 Avl List Gmbh Verfahren und vorrichtung zur kontinuierlichen messung eines dynamischen fluidverbrauchs
AT515306B1 (de) * 2014-07-24 2015-08-15 Avl List Gmbh Kraftstoffverbrauchsmesssystem sowie Verfahren zur Messung eines Kraftstoffverbrauchs einer Verbrennungskraftmaschine
DE102017115400A1 (de) * 2017-07-10 2019-01-10 Endress + Hauser Messtechnik Gmbh+Co. Kg Messsystem

Also Published As

Publication number Publication date
AT524206A4 (de) 2022-04-15
CN116648603A (zh) 2023-08-25
WO2022099340A1 (fr) 2022-05-19
US20240003727A1 (en) 2024-01-04
AT524206B1 (de) 2022-04-15

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