WO1995015520A1 - Dispositif pour doser un fluide de maniere controlee - Google Patents
Dispositif pour doser un fluide de maniere controlee Download PDFInfo
- Publication number
- WO1995015520A1 WO1995015520A1 PCT/FR1994/001408 FR9401408W WO9515520A1 WO 1995015520 A1 WO1995015520 A1 WO 1995015520A1 FR 9401408 W FR9401408 W FR 9401408W WO 9515520 A1 WO9515520 A1 WO 9515520A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluid
- pressure
- laminar
- pressure drop
- reservoir
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/02—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants
- B67D7/0238—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants utilising compressed air or other gas acting directly or indirectly on liquids in storage containers
-
- 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 present invention relates to a device for dosing fluids from a tank or from pressurized pipes. More specifically, it involves injecting small amounts of fluid in a controlled manner.
- the fluid to be injected is, in general, contained in a pressurized tank and flows from said tank through a pressure drop. Pressurization can be carried out by the fluid to be metered itself if it is forced into the tank by a compressor, a pump or a high pressure tank or by a second fluid which is easier to handle or can be stored under a level of significant pressure. In the latter case, the fluid can be a liquid or a gas.
- the present invention essentially consists in placing at one point located on the circuit consisting of the fluid or of all of the fluids one or more laminar pressure drops provided with a differential pressure sensor which makes it possible to measure the volume flow in real time and to give the information necessary for adjusting an actuator intended to vary the pressure in the reservoir of the fluid to be metered.
- the flow control device is characterized in that it comprises: a reservoir containing the fluid to be dosed and a working fluid which compensates for the loss of liquid and makes it possible to pressurize said reservoir, a means for pressurizing the working fluid, a means for regulating the pressure of the working fluid as a function of the needs for the fluid to be metered, laminar pressure drop means mounted on the line in which one or the other of the fluids circulates for determining the flow rate of fluid passing through the line, and control means of the regulating means for modifying the pressure in the reservoir as a function of the value of the flow rate to be dosed and of the physical characteristics of the fluid passing through the laminar pressure drop means .
- the flow rate of the fluid to be delivered is directly measured and the flow rate of the working fluid is acted upon to regulate the flow rate delivered.
- the flow of working fluid is measured and controlled, which makes it possible to control the flow of fluid which will ultimately be delivered. This second mode of implementation is particularly well suited to the case where the fluid to be delivered is a very viscous liquid.
- FIG. 1 is a view in longitudinal section showing the essential parts d 'a first particular embodiment of an apparatus for generating a low regulated flow rate in which the fluid to be injected is a liquid, the propellant fluid being a gas;
- FIG. 2 is a longitudinal sectional view of a variant of the first particular embodiment of an apparatus according to the invention in which the pressure drop elements and the control valves are integrated into the tank cover;
- - Figure 3 gives an embodiment of the laminar pressure drop element
- - Figure 4 is a longitudinal sectional view of a second embodiment of an apparatus according to the invention, in which the fluid to be injected is contained in a deformable reservoir itself contained in the pressurized reservoir; and
- FIG. 1 illustrates an embodiment of an apparatus for creating a controlled flow of low flow fluid.
- the liquid 1 for which the flow is to be controlled is contained in a reservoir 3. It is pressurized by means of a gas 2 initially contained in a high pressure reservoir 4, then expanded through a regulator 5 and a laminar pressure drop 7.
- the pipes 8 and 9 are connected to the reservoir 3 and make it possible to admit or evacuate the gas by opening the all-or-nothing valves 6 and 11.
- each of these pipes is provided with a pressure drop 7 and 10 operating in laminar mode.
- the opening or closing of one or other of the valves 6 and 11 is controlled by the automaton 22 to starting from the knowledge of the flow rate of the liquid to be dosed, the pressure and the temperature of the fluid measured by the pressure 20 and temperature sensors 21.
- the liquid to be dosed is, for its part, extracted from the reservoir 3 through the piping 12 which supplies three laminar pressure drops 14, 15, 16, arranged in parallel with known characteristics.
- the fluid lines on which these pressure drops are placed are provided with all-or-nothing valves 17, 18, 19. The fluid is then directed to use through the piping 13.
- a flow order is given to the controller 22 by an operator or a computer.
- the automaton measures the temperature of the liquid using the temperature probe 21. It calculates the viscosity of the fluid from this temperature measurement. It deduces therefrom by calculation the pressure drop 14, 15 or 16 to be used and the pressure difference to be created between the tank 3 and the piping 13. If the pressure difference measured by means of the sensor 20 between 3 and 13 is less than this set value, the valve 6 is open, the valve 11 being closed, which has the effect of introducing gas into the tank 3 and therefore increasing the pressure. Otherwise, corresponding to a too large pressure difference, the valve 6 is closed and the valve 11 is opened. The gas then escapes from the tank 3 and the pressure drops.
- the pressure control is therefore done by intermittent closing and opening of all-or-nothing valves on the gas circuit.
- a variant of the process not shown in the drawings consists in using a traditional pressure regulation system, but the gas consumption is then much greater.
- FIG. 2 gives an embodiment of a metering device based on the principle described in the previous figure in which the laminar pressure drops are integrated into the cover of the device.
- the reservoir 3 the fluids 1 and 2 and the pressurized gas reservoir 4, the gas lines 8 and 9 provided with laminar pressure drops 7 and 10 and all-or-nothing valves 6 and 11.
- the pressure and temperature sensors 20 and 21 are connected to the automaton 22 which, on the basis of the flow rate setpoint and the properties of the fluid to be metered, chooses one of the lines for discharging the liquid flow rate. through one or the other of the laminar pressure drops 14, 15 or 16 by opening one or the other of the solenoid valves 17, 18 or 19.
- said automaton 22 controls the pressure in the reservoir 3 by opening or closing the all-or-nothing valves 6 and 11 of the gas lines.
- the pressure drops consist of shallow spirals engraved in pellets in the form of wafers, an example of which is given in FIG. 3. These engravings, brought into contact with a cylindrical counterbore, constitute a passage of small section through which the fluid passes. It therefore constitutes a long and small diameter element capable of constituting a laminar pressure drop.
- these wafers are inserted between plates 23, which allows for a compact assembly.
- the pressure drops 14, 15 and 16 are on a first level of the stack.
- the pressure drops 7 and 10 on the gas are at a second level.
- the upper and lower elements of FIG. 2 are respectively a section at the level of the pellets 14, 15 and 16 and a top view showing the arrangement of the on / off valves.
- the tank 3 has a height of 150 mm and a diameter of 100 mm. It is filled with 1 liter of liquid to be dosed.
- the pressure drop elements 14, 15 and 16 have hydraulic diameters D of 60, 100 and 170 microns and a length of L of 1 meter.
- the pressure in the tank is regulated by means of pressure drops 7 and 10 and all-or-nothing valves 6 and 11 in a range between 1 and 10 bar.
- the nominal dynamic viscosity ⁇ of the liquid to be dosed is 10-3 p a .s.
- the liquid flow rate is given by the following expression:
- the range of flow rates therefore goes from 3.2 10 -11 m 3 / s (2.8 cm 3 / d) for the couple (1 bar, 60 ⁇ ) to 2 10 -8 m 3 / s (72 cm 3 / h) for the couple (10 bar, 170 ⁇ ).
- the flow dynamics are therefore around 1000.
- FIG. 3 gives a representation in longitudinal section and top view of the spiral laminar pressure drop 7, 10, 14, 15, 16 or 35.
- the parts 37 and 38 are shown diagrammatically by two cylindrical pellets. The fluid penetrates at 39 through the part 37, feeds the spiral 40 of which only a limited number of turns has been shown, then leaves the groove through the orifice 41.
- FIG. 4 shows a representation of another embodiment of the invention.
- the fluid 1 to be dosed is contained in a deformable reservoir 28, itself placed in the reservoir 3.
- the working fluid 2 is sucked by a pump 24, passes into the reservoir 35 provided with a membrane 26 'allowing to isolate the liquid contained in compartment 27 and the gas contained in compartment 26.
- This small reservoir makes it possible to filter any pressure pulsations from pump 24.
- the pressure in this reservoir is regulated by means of valve 25, controlled by the automaton 22.
- the operation of the system is as follows: the reservoir 3 is pressurized to a predetermined level by calculation, so that the flow rate flowing to the nozzle 33 is suitable for starting the dosing operation.
- the operator or the robot opens the shutter 32 which allows the fluid 2 to flow through the injection nozzle 33 at the desired flow rate.
- the two fluids 2 and 1 being incompressible, the flow rate of fluid 2 flowing at the nozzle 33 is the same as that of liquid 1 flowing in the laminar pressure drop 36.
- the working fluid is oil for substantially incompressible hydraulic circuits.
- the installation comprises a regulated source A of oil, a set B for measuring the oil flow, a set C for storing and delivering the adhesive and an automaton D for controlling the various sets of the installation.
- the assembly A comprises an oil storage tank 50 connected to a bladder accumulator 52 by a high pressure oil pump 54 which supplies the accumulator with an almost constant flow rate.
- a regulating valve 56 constituted by a variable pressure drop makes it possible to modify the pressure in the oil circuit.
- the output 58 of the accumulator 52 is connected to the flow measurement assembly B.
- the assembly B essentially consists of two laminar pressure drops 60 and 62 mounted in parallel of the type described above. The pressure drop values are different to allow adaptation to different measurement ranges. Each pressure drop is associated with a valve 64 and 66.
- a differential pressure sensor 68 measures the pressure across the pressure drops to deduce the flow.
- the valve 70 makes it possible to decompress the pressure drops.
- the outlet 72 for pressure drops is connected to the inside of a rigid-walled tank 74, capable of withstanding high pressure. Inside the reservoir 74, there is a capacity 76 with a tight deformable wall which is initially filled with glue by the pipe 80 and the valve 82. The glue is delivered by the outlet pipe 84 provided with the valve 86.
- the accumulator 52 and the reservoir 74 are provided with a temperature sensor 88 and 90 for measuring the temperatures of the oil in these two chambers.
- the entire installation is controlled by a PLC D.
- the PLC selects one of the two pressure drops 60 and 62 and controls the pump. 54 and the regulating valve 56 as a function of the measurement of the flow calculated by the automaton from the measurement supplied by the differential pressure sensor 68.
- Coil depth 2.5 mm These examples are not limiting of the method which applies to any pressure line comprising a working fluid and a metering fluid, on which is placed a laminar pressure drop provided with a differential pressure sensor making it possible to measure the passing flow in said line.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Flow Control (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU11933/95A AU1193395A (en) | 1993-12-03 | 1994-12-02 | Device for the controlled dosing of a fluid |
EP95902826A EP0731939A1 (fr) | 1993-12-03 | 1994-12-02 | Dispositif pour doser un fluide de maniere controlee |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR93/13758 | 1993-12-03 | ||
FR9313758A FR2713362B1 (fr) | 1993-12-03 | 1993-12-03 | Dispositif pour doser un fluide de manière contrôlée. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995015520A1 true WO1995015520A1 (fr) | 1995-06-08 |
Family
ID=9452963
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1994/001408 WO1995015520A1 (fr) | 1993-12-03 | 1994-12-02 | Dispositif pour doser un fluide de maniere controlee |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0731939A1 (fr) |
AU (1) | AU1193395A (fr) |
FR (1) | FR2713362B1 (fr) |
WO (1) | WO1995015520A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU666827B2 (en) * | 1993-07-09 | 1996-02-22 | Microscan, Inc. | Precision fluid dispensing apparatus and method |
EP0794248A1 (fr) * | 1996-03-08 | 1997-09-10 | Gist-Brocades B.V. | Dosage de crème de levure |
EP1790958A1 (fr) | 2005-11-24 | 2007-05-30 | Bayer CropScience AG | Procédé et dispositif de dosage volumétrique |
TWI767759B (zh) * | 2021-06-11 | 2022-06-11 | 新煒科技有限公司 | 膠水回溫裝置 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA3051376C (fr) | 2019-08-06 | 2020-04-28 | Surface Solutions Inc. | Appareil et methodes de surveillance et de conversion du methane |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4170245A (en) * | 1978-03-03 | 1979-10-09 | Fmc Corporation | Digital control valve |
FR2592306A1 (fr) * | 1985-12-30 | 1987-07-03 | Couegnas Jacques | Appareil de perfusion a debit reglable ne provoquant pas de modification du liquide perfuse. |
WO1988004225A1 (fr) * | 1986-12-01 | 1988-06-16 | Hans Willi Meinz | Dispositif pour doser dans une chambre de melange au moins deux constituants reactionnels coulants |
DE3736701A1 (de) * | 1987-10-29 | 1989-05-11 | Inter System Vertrieb Ges Fuer | Verfahren und vorrichtung zum dosieren eines gases |
EP0351995A2 (fr) * | 1988-07-22 | 1990-01-24 | Imperial Chemical Industries Plc | Analyse à injection dans un écoulement |
US5188258A (en) * | 1990-04-07 | 1993-02-23 | Iwashita Engineering, Ltd. | Apparatus reponsive to pressure of a medium which effects fluid discharge for controlling the pressure of the medium and the time the medium acts on the fluid |
US5199607A (en) * | 1990-12-03 | 1993-04-06 | Musashi Engineering, Inc. | Liquid dispensing apparatus |
-
1993
- 1993-12-03 FR FR9313758A patent/FR2713362B1/fr not_active Expired - Fee Related
-
1994
- 1994-12-02 EP EP95902826A patent/EP0731939A1/fr not_active Withdrawn
- 1994-12-02 AU AU11933/95A patent/AU1193395A/en not_active Abandoned
- 1994-12-02 WO PCT/FR1994/001408 patent/WO1995015520A1/fr not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4170245A (en) * | 1978-03-03 | 1979-10-09 | Fmc Corporation | Digital control valve |
FR2592306A1 (fr) * | 1985-12-30 | 1987-07-03 | Couegnas Jacques | Appareil de perfusion a debit reglable ne provoquant pas de modification du liquide perfuse. |
WO1988004225A1 (fr) * | 1986-12-01 | 1988-06-16 | Hans Willi Meinz | Dispositif pour doser dans une chambre de melange au moins deux constituants reactionnels coulants |
DE3736701A1 (de) * | 1987-10-29 | 1989-05-11 | Inter System Vertrieb Ges Fuer | Verfahren und vorrichtung zum dosieren eines gases |
EP0351995A2 (fr) * | 1988-07-22 | 1990-01-24 | Imperial Chemical Industries Plc | Analyse à injection dans un écoulement |
US5188258A (en) * | 1990-04-07 | 1993-02-23 | Iwashita Engineering, Ltd. | Apparatus reponsive to pressure of a medium which effects fluid discharge for controlling the pressure of the medium and the time the medium acts on the fluid |
US5199607A (en) * | 1990-12-03 | 1993-04-06 | Musashi Engineering, Inc. | Liquid dispensing apparatus |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU666827B2 (en) * | 1993-07-09 | 1996-02-22 | Microscan, Inc. | Precision fluid dispensing apparatus and method |
EP0794248A1 (fr) * | 1996-03-08 | 1997-09-10 | Gist-Brocades B.V. | Dosage de crème de levure |
EP1790958A1 (fr) | 2005-11-24 | 2007-05-30 | Bayer CropScience AG | Procédé et dispositif de dosage volumétrique |
TWI767759B (zh) * | 2021-06-11 | 2022-06-11 | 新煒科技有限公司 | 膠水回溫裝置 |
Also Published As
Publication number | Publication date |
---|---|
FR2713362B1 (fr) | 1996-03-01 |
FR2713362A1 (fr) | 1995-06-09 |
AU1193395A (en) | 1995-06-19 |
EP0731939A1 (fr) | 1996-09-18 |
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