EP1773479B1 - Dispositif de dosage pour introduire un additif dans un courant de liquide - Google Patents

Dispositif de dosage pour introduire un additif dans un courant de liquide Download PDF

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Publication number
EP1773479B1
EP1773479B1 EP05783999A EP05783999A EP1773479B1 EP 1773479 B1 EP1773479 B1 EP 1773479B1 EP 05783999 A EP05783999 A EP 05783999A EP 05783999 A EP05783999 A EP 05783999A EP 1773479 B1 EP1773479 B1 EP 1773479B1
Authority
EP
European Patent Office
Prior art keywords
pump
venturi
flow
inlet
additive
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.)
Not-in-force
Application number
EP05783999A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1773479A1 (fr
Inventor
Gilbert Barras
Matthieu Darbois
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.)
Dosatron International SAS
Original Assignee
Dosatron International SAS
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 Dosatron International SAS filed Critical Dosatron International SAS
Priority to PL05783999T priority Critical patent/PL1773479T3/pl
Publication of EP1773479A1 publication Critical patent/EP1773479A1/fr
Application granted granted Critical
Publication of EP1773479B1 publication Critical patent/EP1773479B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/10—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing liquids, e.g. containing solids, or liquids and elastic fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/315—Injector mixers in conduits or tubes through which the main component flows wherein a difference of pressure at different points of the conduit causes introduction of the additional component into the main component
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/882—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances
    • B01F35/8822—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances using measuring chambers of the piston or plunger type
    • B01F35/88222—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances using measuring chambers of the piston or plunger type without external means for driving the piston, e.g. the piston being driven by one of the components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F04B13/02—Pumps specially modified to deliver fixed or variable measured quantities of two or more fluids at the same time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
    • F04B9/105—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting liquid motor
    • F04B9/1053—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting liquid motor one side of the double-acting liquid motor being always under the influence of the liquid under pressure

Definitions

  • the invention relates to a metering device for introducing an additive into a main liquid stream circulating in a pipe, which device comprises a reciprocating differential piston pump for withdrawing the additive from a container and dosing it, this pump having a first inlet for receiving a main liquid flow which drives the pump, a second inlet for withdrawing the additive and an outlet for the admixture of additive and main liquid.
  • EP 0 255 791 relates to a dosing device of the kind defined above wherein an adjustment of the dose drawn and then injected is provided by moving a jacket along a tube to adjust the length of the suction stroke of the piston.
  • FR 740 179 relates to a Venturi ejector according to which is sucked at the neck of the Venturi a fluid which mixes with a fluid fluid relaxing in the convergent.
  • the driving fluid may be a liquid, especially water, while the aspirated fluid may be air in the case of a water jet vacuum ejector.
  • the dosage of the fluid sucked into the mixture of fluid and aspirated fluid is not taken into consideration.
  • the range of dosages is limited especially for obtaining very small dosages, for example of the order of parts per million (ppm).
  • the volumes of additive to be injected at each cycle of the pump then become very small and can not be obtained by a simple mechanical system.
  • WO 02/02938 proposes a device that allows small dosages.
  • this device uses periodic electric control means and solenoid valves, which complicates the installation and increases the cost.
  • the object of the invention is, above all, to provide a dosing device which makes it possible in a simple and economical way to process high flow rates of main liquid with pumps of reduced dimensions and to increase the permitted range of dosages, in particular to small dosages.
  • a metering device for introducing an additive into a main liquid stream flowing in a pipe, this device comprising a reciprocating differential piston pump for withdrawing the additive into a container and dosing it, this pump comprising a first inlet for receiving a main liquid flow which drives the pump, a second inlet for withdrawing the additive and an outlet for the admixture of additive and main liquid, is characterized in that it comprises a venturi arranged in the pipe and in that the pump is connected in parallel with the venturi, the first inlet of the pump being connected to the inlet of the venturi while the outlet of the pump is connected to the neck of the venturi.
  • the geometry of the venturi is adjusted to the pressure drop of the pump between first inlet and outlet, to allow a substantially constant dosage to be obtained despite flow variations, and independent of the inlet pressure.
  • the geometry of the venturi can be adjusted to establish in operation a pressure difference of about 1.5 bar and less than 2 bar between the inlet pressure and the pressure at the neck.
  • the geometry of the venturi can be adjusted so that the pressure drop created by the venturi is less than 0.5 bar.
  • An additional pressure drop can be created in the bypass circuit of the pump, in particular by a nozzle, in particular adjustable, preferably disposed at the outlet of the pump.
  • the venturi can be set so that the ratio R is at least ten, or close to ten. Large flows can therefore be treated by smaller pumps.
  • the ratio R may be greater than one hundred.
  • the pump may be provided to allow a volume ratio between injected additive flow and engine liquid flow through the pump less than or equal to one thousandth (1/1000) while the volume dilution of the mixture exiting the pump in the main flow
  • the venturi crossing is less than one percent (1%) so that the volume dosage in the main flow is less than or equal to 10 -5 or 10 ppm (10 parts per million).
  • venturi and the pump form a together, and connection means are provided at the inlet and the outlet of the venturi for insertion and connection to two sections of the pipe.
  • a dosing device D for introducing a liquid additive A in a main liquid stream L, water in the example in question.
  • the liquid additive A is contained in a container 1.
  • Device D comprises a metering pump 2 arranged with its vertical axis.
  • the pump 2 is of a known type, in particular manufactured and marketed by the applicant company DOSATRON INTERNATIONAL. An example of such pumps is described in EP 1 151 196 or US 6,684,753 .
  • the pump 2 comprises a reciprocating differential piston 3 which drives a piston 4 of smaller diameter, ensuring the pumping and injection of the additive A.
  • the piston 4 slides in a chamber cylindrical auxiliary pump 5 connected by a sampling tube 6 to the container 1.
  • the tube 6 immersed in the additive to be taken.
  • the pump 2 comprises a first inlet 7 for receiving a flow of main liquid, generally water, which drives the differential piston 3.
  • the pump 2 comprises a second inlet 8 located at the bottom of the auxiliary pump body 5 for the removal of the additive A, and an outlet 9 for the mixture of additive A and main liquid L.
  • Device D comprises a venturi 10 which has an inlet section 11, a neck 12 of reduced section and an outlet section 13.
  • the pump 2 is connected in parallel with the venturi 10, the first inlet 7 of the pump being connected by a pipe 14 to the inlet 11 of the venturi while the outlet 9 of the pump is connected by a pipe 15 to the neck 12 of the venturi .
  • the cross sections of the different parts of the venturi are preferably circular, but could have a different shape, for example rectangular.
  • the pressure difference (Pe -Pc) between the inlet and the neck of the venturi is related to the geometry (section variation) and the flow rate Qe of liquid.
  • a variation of the inlet pressure shifts the operating range of the venturi, the range of which decreases as the inlet pressure increases.
  • the pressure difference between the inlet 11 and the neck 12 of the venturi is adjusted to the pressure drop between the inlet 7 and the outlet 9 specific to the pump in normal operation.
  • this pressure drop can be of the order of 1.5 bar and remains less than 2 bar.
  • venturi The geometry of the venturi is designed to create a reduced pressure drop, less than 0.5 bar, between inlet and outlet of the venturi.
  • the venturi 10 and the pump 2 may form an assembly, and connection means Re and Rs are provided at the inlet and the outlet of the venturi for insertion and connection to two sections of the pipe Te, Ts.
  • the derivative flow which passes through the pipe 14 and into the pump 2 allows the operation of the metering pump between the inlet pressure Pe of the venturi 10 and the pressure Pc at the neck.
  • the venturi 10 is set so that the ratio R of the flow rate Qe passing through the venturi 10 to the flow rate Qd passing through the metering pump 2 is at least equal to 10 (ten).
  • the main flow does not pass into the metering pump 2.
  • This allows the use of a small pump 2 for dosing an additive product A in a large flow of main liquid.
  • a standard pump of maximum flow 2.5 m 3 / h ensuring a dosage of 10%.
  • the invention thus makes it possible to treat large flows of main liquid with relatively small dosing pumps.
  • the ratio R to ensure small dosages can be at least 100 (one hundred).
  • a metering pump 2 allowing a volume ratio between flow rate of additive A injected and flow rate Qd of engine liquid passing through the pump equal to one thousandth (1/1000), combined with a dilution of at least one percent (1%) allows a volume dosage of additive A in the main flow rate Qe less than 10 -5 , ie 10 ppm (10 parts per million).
  • FIG. 3 illustrates an additional possibility of adjusting the flow rate of the pump by creating an additional pressure drop in the circuit derived from the pump.
  • this pressure drop is created by a nozzle 16 installed at the outlet 9 of the pump.
  • the nozzle 16 has a calibrated through hole.
  • the pump 2, in the absence of any nozzle 16 generally allows a flow rate adjustment between a maximum value M and a minimum value M / p, with p close to three, for example.
  • the adjustment range is increased towards the lower values, according to the diameter of the calibrated orifice of the nozzle.
  • the nozzle 16 may be adjustable, in particular by means of a needle, which makes it possible to vary the dosage, in particular particularly in the case of a dosing pump which has no adjustment.
  • At least two different nozzles can be provided, mounted in parallel on one or more by-passes, with one or more selection valves, which makes it possible to obtain at least two dosing ranges.
  • venturi and metering pump allows a pressure independent operating range. This combination also makes it possible to obtain a substantially constant dosage and not simply an injection that would vary as a function of pressure and flow rate variations.
  • the invention makes it possible to overcome the pressure limitation of the venturi.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Nozzles (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Paper (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Accessories For Mixers (AREA)
EP05783999A 2004-07-15 2005-06-29 Dispositif de dosage pour introduire un additif dans un courant de liquide Not-in-force EP1773479B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05783999T PL1773479T3 (pl) 2004-07-15 2005-06-29 Urządzenie dozujące, służące do wprowadzania dodatku do strumienia płynu głównego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0407879A FR2873172B1 (fr) 2004-07-15 2004-07-15 Dispositif de dosage pour introduire un additif dans un courant de liquide
PCT/FR2005/001655 WO2006016032A1 (fr) 2004-07-15 2005-06-29 Dispositif de dosage pour introduire un additif dans un courant de liquide

Publications (2)

Publication Number Publication Date
EP1773479A1 EP1773479A1 (fr) 2007-04-18
EP1773479B1 true EP1773479B1 (fr) 2008-01-09

Family

ID=34948220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05783999A Not-in-force EP1773479B1 (fr) 2004-07-15 2005-06-29 Dispositif de dosage pour introduire un additif dans un courant de liquide

Country Status (10)

Country Link
US (1) US20070227961A1 (pl)
EP (1) EP1773479B1 (pl)
AT (1) ATE383196T1 (pl)
DE (1) DE602005004294T2 (pl)
DK (1) DK1773479T3 (pl)
ES (1) ES2300050T3 (pl)
FR (1) FR2873172B1 (pl)
PL (1) PL1773479T3 (pl)
PT (1) PT1773479E (pl)
WO (1) WO2006016032A1 (pl)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090032272A1 (en) * 2006-01-30 2009-02-05 William James Duncan Fluid Vessel and Method for Charging a Fluid Vessel
WO2008005996A2 (en) * 2006-07-05 2008-01-10 Stryker Corporation Medical/surgical lavage system capable of selectively and sequentially discharging either a base solution or a solution which includes a therapeutic agent
GB0801770D0 (en) 2008-01-31 2008-03-05 Burnham Douglas P Fluid delivery device and method
CA2727136C (en) 2010-01-06 2018-03-06 Puricore, Inc. Method of injecting solution into a misting line
FR2967218B1 (fr) * 2010-11-08 2016-09-02 Dosatron International Doseur proportionnel d'un liquide auxiliaire dans un liquide principal.
FR3001003B1 (fr) * 2013-01-17 2015-03-20 Dosatron International Dispositif de dosage pour introduire un additif liquide dans un courant de liquide principal.
FR3016302B1 (fr) * 2014-01-10 2016-02-05 Dosatron International Melangeur statique pour homogeneiser un melange d'au moins deux liquides et dispositif de dosage equipe d'un tel melangeur
FR3100105B1 (fr) 2019-08-30 2023-12-08 Arkema France Formulation fumigante pour application en goutte a goutte
WO2021252403A1 (en) 2020-06-07 2021-12-16 Comestaag Llc Barrier coating compositions for perishables and methods, kits and coated items relating thereto

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR740179A (fr) * 1932-06-21 1933-01-23 éjecteur
US2758877A (en) * 1954-12-06 1956-08-14 Robert H Gleason Apparatus for dispensing materials
US3330290A (en) * 1963-10-17 1967-07-11 Jay Q Davis Water-fertilizer mixing pump
GR61644B (en) * 1975-10-09 1978-12-05 Iplex Plastic Ind Pty Ltd Delivering measured quantities of liquid into a fluid
US4123800A (en) * 1977-05-18 1978-10-31 Mazzei Angelo L Mixer-injector
GB2130910B (en) * 1982-09-25 1987-03-18 Gilmat Engineering Limited Additive supply apparatus for use in a fluid supply line
FR2602282B1 (fr) * 1986-07-31 1988-09-23 Cloup Jean Perfectionnement aux dispositifs d'injection d'un produit additif dose dans un fluide principal
US5234322A (en) * 1992-12-24 1993-08-10 Chemilizer Products, Inc. Proportioning pump improvements
FR2707350B1 (fr) * 1993-07-05 1995-09-01 Ody Civile Ste Rech Dispositif de commande des déplacements alternatifs d'un piston différentiel, et pompe doseuse comportant un tel dispositif.
US6192911B1 (en) * 1999-09-10 2001-02-27 Ronald L. Barnes Venturi injector with self-adjusting port
FR2789445B1 (fr) * 1999-02-09 2001-03-23 Dosatron Internat Sa Machine hydraulique differentielle a mouvement alternatif, en particulier moteur hydraulique differentiel

Also Published As

Publication number Publication date
FR2873172A1 (fr) 2006-01-20
WO2006016032A1 (fr) 2006-02-16
DK1773479T3 (da) 2008-05-26
EP1773479A1 (fr) 2007-04-18
PT1773479E (pt) 2008-04-07
US20070227961A1 (en) 2007-10-04
DE602005004294D1 (de) 2008-02-21
ATE383196T1 (de) 2008-01-15
FR2873172B1 (fr) 2007-11-02
DE602005004294T2 (de) 2009-01-02
ES2300050T3 (es) 2008-06-01
PL1773479T3 (pl) 2008-07-31

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