EP2946110B1 - Metering device for introducing a liquid additive into a stream of main liquid - Google Patents

Metering device for introducing a liquid additive into a stream of main liquid Download PDF

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Publication number
EP2946110B1
EP2946110B1 EP13826872.7A EP13826872A EP2946110B1 EP 2946110 B1 EP2946110 B1 EP 2946110B1 EP 13826872 A EP13826872 A EP 13826872A EP 2946110 B1 EP2946110 B1 EP 2946110B1
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EP
European Patent Office
Prior art keywords
venturi
throat
pump
pressure
neck
Prior art date
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Application number
EP13826872.7A
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German (de)
French (fr)
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EP2946110A1 (en
Inventor
Sébastien FURET
Sandrine Lambinet
Philippe Duquennoy
Manal BADII
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Dosatron International SAS
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Dosatron International SAS
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Priority to PL13826872T priority Critical patent/PL2946110T3/en
Publication of EP2946110A1 publication Critical patent/EP2946110A1/en
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Publication of EP2946110B1 publication Critical patent/EP2946110B1/en
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    • 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
    • B01F25/3123—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements
    • B01F25/31232—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements used simultaneously
    • 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
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
    • 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
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3143—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit characterised by the specific design of the injector
    • 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
    • B01F25/316—Injector mixers in conduits or tubes through which the main component flows with containers for additional components fixed to the conduit
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/106—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being an axial piston pump
    • 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
    • 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
    • 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
    • F04F5/12—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 of multi-stage type
    • 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
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/461—Adjustable nozzles
    • 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
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/463—Arrangements of nozzles with provisions for mixing
    • 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
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48—Control
    • 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
    • B01F25/3125—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characteristics of the Venturi parts
    • B01F25/31251—Throats
    • B01F25/312511—Adjustable Venturi throat

Definitions

  • the invention relates to a metering device for introducing a liquid additive into a main liquid stream flowing in a pipe, a device of the type comprising a reciprocating differential piston pump for withdrawing the additive into a container. and metering it, said pump comprising a first inlet for receiving a main liquid flow which drives the pump, a second inlet for taking the additive and an outlet for the mixture of additive and liquid, the device comprising a venturi installed in the pipe, the pump being connected in parallel with the venturi, the first inlet of the pump being connected by a first pipe to the inlet of the venturi, while the outlet of the pump is connected by a second pipe to the neck venturi.
  • a dosing device of this kind is known from EP 1773479 , on behalf of the Applicant Company, which allows the treatment of high flow rates of main liquid with smaller pumps and increases the permitted range of dosages.
  • the differential piston pumps used in these metering devices are known per se, in particular according to EP 1151196 or US 6684753 .
  • the differential piston reciprocates and drives a plunger to withdraw the additive to be dosed during a rise stroke and to inject this additive into the main liquid or engine liquid during a down stroke.
  • the pressure drop between the first input of the pump and the output is variable depending on the operating phases of the pump.
  • the venturi must be provided to create a pressure drop between its inlet and the neck substantially equal to the pressure drop in the pump.
  • the metering devices of the kind defined above are satisfactory, differences in pressure drop between rise and fall of the differential piston not being too important.
  • the performance of the metering device remains acceptable because the pressure drop between the neck of the venturi and its inlet is not too different from the pressure drop of the pump during the rise and the descent of the differential piston.
  • the object of the invention is, above all, to propose a dosing device of the kind defined above which no longer has or to a lesser degree the disadvantages mentioned above and which makes it possible to optimize the operation, in particular in the case where the Additive dosages are relatively high, especially greater than 0.2% in the main liquid.
  • the means responsive to the pressure drop in the pump is constituted by a means of comparison between the pressure at the neck of the venturi and the pressure at the neck of a second venturi installed on the first pipe leading to the inlet of the pump. .
  • the efficiency of the metering device according to the invention is improved by a better match between the total pressure drop between the inlet and the outlet of the pump and the pressure drop at the neck of the venturi.
  • variable throttle means of the venturi neck preferably comprises a member slidably mounted in a direction inclined relative to the geometric axis of the venturi.
  • the means of comparison between the neck pressures of the two venturi may comprise a movable separation means separating two chambers connected respectively to the neck of one of the two venturis, the organ throttling being related to this movable separating means so that an increase in pressure at the neck of the second venturi relative to the pressure at the neck of the first venturi causes an increase in the neck throat of the first venturi, and vice versa.
  • the mobile separation means comprises a membrane.
  • the sliding member may be constituted by a blade .
  • This blade can be slidably mounted with sufficient clearance in a guide of the venturi body, so that the neck pressure is transmitted to the chamber located on the side of the neck.
  • the throttle member is constituted by a cylindrical rod.
  • the end of the cylindrical rod facing the neck may be substantially hemispherical.
  • the cylindrical shank may be attached to the end of a smaller diameter shank which sealingly traverses a plate closing a chamber connected to the throat of the venturi.
  • a channel is located upstream of the throttle member to provide a pressure tap which allows the flow measurement at the neck of the venturi.
  • the cylindrical rod comprises a longitudinal channel opening at its end close to the neck of the venturi and connected at its other end to a chamber located on the side of the neck of the venturi.
  • the outlet pipe of the pump is connected to the neck of the venturi by at least one lateral opening relative to the attachment of the pipe to the body of the venturi.
  • venturi and the pump form an assembly, with connection means 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 into a main liquid stream L flowing in a pipe 1 roughly represented.
  • the main liquid is usually water but the device D can be suitable for all kinds of liquids.
  • the liquid additive A is contained in a container 2 schematically represented.
  • Device D comprises a pump 3 arranged with its vertical axis.
  • the pump 3 is of a known type, in particular manufactured and marketed by the applicant company. An example of such pumps is described in EP 1 151 196 or US 6,684,753 .
  • the pump 3 comprises a reciprocating differential piston 4 which drives a piston 5 of smaller diameter to withdraw the additive in the container 2 and dose it.
  • the plunger 5 slides in a cylindrical chamber of an auxiliary pump 6 connected by a sampling tube 7 to the container 2.
  • the tube 7 is immersed in the additive A to be withdrawn.
  • the pump 3 comprises a first inlet 8 for receiving a main liquid flow which drives the differential piston 4.
  • the pump 3 comprises a second inlet 9 located in the lower part of the body of the auxiliary pump 6 for sampling the additive A, and an outlet 10 for the mixed mixture of additive A and main liquid L.
  • the device D comprises a venturi 11 installed in the pipe 1.
  • the first inlet 8 of the pump is connected by a first pipe 12 to the inlet of the venturi, while the outlet 10 of the pump is connected by a second pipe 13 to the venturi collar.
  • the pump 3 is thus connected in parallel with the venturi.
  • the device D comprises a variable throttling means E of the neck of the venturi 11, and a means G responsive to the pressure drop in the pump 3 for controlling the throttling means E of the neck of the venturi.
  • variable throttling means E comprises a slide 14 slidably mounted in an inclined direction from upstream to downstream with respect to the geometric axis of the venturi 11. According to Fig.1 the angle of inclination, turned upstream, formed between the blade 14 and the geometric axis of the venturi is about 70 °.
  • the blade 14 is disposed in a substantially cylindrical base 15, projecting from the body of the venturi 11, this base being surmounted by a cover 16.
  • the base and the cover define a cylindrical housing with a geometric axis inclined with respect to the geometric axis of the venturi.
  • the blade 14 is located in a plane orthogonal to the vertical plane passing through the geometric axis of the venturi11.
  • the blade 14 passes through a slot provided in the wall of the neck of the venturi and can project from its lower end 14a in the neck 11c of the venturi.
  • the end 14a as visible on Fig. 6 , is in the shape of a concave arc.
  • the blade 14 slides in a guide of the venturi body with a clearance j ( Fig.
  • the venturi 11 conventionally comprises a convergent, located upstream of the neck 11c, and a divergent downstream of the neck.
  • neck 11c is meant an area of the venturi, whose axial extent may be relatively long, which has a reduced diameter relative to the inlet and outlet diameter.
  • the outlet pipe 13 of the pump is connected by a connection 19 screwed sealingly, with seal, into a threaded hole 20 provided at the periphery of the body of the venturi.
  • the geometric axis of the hole 20 is located in a plane orthogonal to the plane of the blade 14, and passing through the geometric axis of the venturi.
  • the body of the venturi comprises ribs 22 angularly offset by 90 ° and the threaded hole 20 is formed in a cylindrical core 21 of geometric axis orthogonal to that of the venturi and overflowing on either side of a rib 22 to which it connects.
  • the hole 20 does not open directly into the neck of the venturi, from which it is separated in the direction of the geometric axis of the hole 20 by a bottom wall 23.
  • a throat 24 On either side transversely of this wall 23 is provided a throat 24 which opens into the neck of the venturi according to a side window 25 whose angular position is shifted substantially 90 ° relative to the threaded hole 20 for connecting the outlet pipe 13.
  • a valve 26 to break the vacuum is diametrically opposite the connector 19 and communicates with the venturi neck.
  • the means G sensitive to the pressure drop in the pump 3 comprises a means for comparing the pressure at the neck of the venturi 11 and the neck pressure of a second venturi 27 installed on the first pipe 12 leading to the inlet 8 of the pump.
  • the means G is advantageously constituted by the membrane 18 according to the embodiment of the drawings.
  • the second venturi 27 is provided in a block secured to the lid 16.
  • the geometric axis of the venturi 27 is orthogonal to the geometric axis of the first venturi 11.
  • the inlet of the convergent of the second venturi 27 is constituted by an opening opening into the
  • the neck of the second venturi 27 is connected, by a transverse pipe 28, to a chamber 29 provided in the cover 16 and located on the side of the diaphragm 18 remote from the first venturi 11.
  • the divergent venturi 27 is turned towards pump 3 and is connected to the pipe 12.
  • a main liquid stream L flows in line 1 under a static pressure of 1 to 6 bars generally.
  • the flow velocity of the fluid increases and its static pressure decreases.
  • the difference in pressure between the inlet of the venturi 11 and the collar makes it possible to operate the pump 3 and to actuate the differential piston by means of a fraction of the main stream derived by the second venturi 27 and the pipe 12.
  • the auxiliary pump 6 driven by the reciprocating movements of the differential piston 4 takes doses of additive A in the container 2 and the metered mixture is injected into the neck of the venturi via the pipe 13 through the windows 25.
  • the pressure in the chamber 29 becomes greater than that prevailing in the chamber 17 and the membrane 18 is deformed to allow the blade 14 to slide and to enter further into the neck of the venturi 11.
  • the blade 14 and the membrane 18 will oscillate at the speed of the differential piston 4 to ensure a better match between the pressure drop at the neck of the venturi 11 and the total pressure drop in the pump 3.
  • the effectiveness of the dosing device is maintained when the dosages are relatively high, especially greater than 0.2% of additive A in the main flow, and up to 1% in the main flow.
  • the working range of the device according to the invention is enlarged.
  • the low-speed start is made reliable, which makes it possible to start with a low flow rate (in particular the minimum flow rate is 6 to 10 times lower than the maximum flow rate) and increase this flow rate after startup while maintaining a precise dosage and good operating efficiency.
  • Figs. 7-11 an alternative embodiment of the dosing device D can be seen.
  • the elements of this device that are identical or similar to elements already described with respect to the previous embodiment are designated by the same numerical or literal references without their description being repeated.
  • variable throttling means E of the neck of the venturi 11 is constituted by a cylindrical rod 30 slidably mounted in an inclined direction from upstream to downstream on the geometric axis of the venturi 11.
  • the inclination is approximately 50 ° according to the example shown.
  • the cylindrical rod 30 is slidably mounted in a bore 31 of the body of the venturi which opens at the neck.
  • the end 32 of the rod turned towards the neck of the venturi is substantially hemispherical.
  • the rod 30 comprises a longitudinal channel 33, preferably axial, which opens towards the throat of the venturi at the end 32 and which is connected at its other end to a radial duct 34 which opens into the chamber 17 situated on the the membrane 18 facing the venturi.
  • the rod 30 is connected to the membrane 18 which determines, on the side opposite the chamber 17, the other chamber 29 connected to the neck of the second venturi 27 by the pipe 28.
  • the pressure at the neck of the venturi 11 is transmitted to the chamber 17 via the longitudinal channel 30 and the transverse duct 34.
  • the operation of the dosing device Fig. 7-11 is similar to that described in the previous figures.
  • the cylindrical rod 30 with its hemispherical end makes it possible to reduce the turbulence in the flow and to improve the overall efficiency.
  • the pressure tap that makes it possible to measure the flow at the neck 11c of the venturi is provided by a channel 35 located upstream of the rod or cylindrical blade 30a, whose outer wall is continuous.
  • the longitudinal channel of the realization of Fig. 7 is deleted.
  • the cylindrical blade 30a hemispherical lower end 32a, is attached to the end of a rod 36, smaller in diameter than 30a.
  • the membrane 18 is attached to the widened end of the rod 36 remote from the blade 30a.
  • the channel 35 communicates the area of the neck of the venturi 11 with the chamber 17 located under the membrane 18.
  • the rod 36 passes through a plate 37 (FIG. Fig. 14 ) closing the chamber 17 on the side of the neck 11 c of the venturi.
  • the plate 37 is traversed by a passage extending the channel 35 and opening into the chamber 17.
  • a seal on the rod 36 is provided by a sealing ring 38, at the crossing of the plate 37.
  • An improvement in the reaction speed of the blade 30a is obtained thereby reducing the section subjected to pressure prevailing at the venturi neck by providing a seal on the rod 36 of smaller diameter.
  • the blade 30a slides with a sufficient radial clearance in its housing for the passage of the liquid; its front face 32a and its rear face are exposed to the same liquid pressure.
  • variable throat means of the neck of the venturi and the means responsive to the pressure drop in the pump could be constituted by a pivoting throttle flap provided in the neck of the venturi and controlled by the pressure-sensitive means.
  • the membrane 18 could be replaced by a piston movable in a cylindrical housing, defining the two chambers 17 and 29, the displacements of the piston controlling those of the blade 14 or the rod 30.
  • venturi 11 can be adjusted to establish in operation at neck 11 c completely open, at full flow a pressure drop at the neck of 2.6 bars, and obtain a pressure drop of less than 1.5 bars for dosages at 1%.

Description

L'invention est relative à un dispositif de dosage pour introduire un additif liquide dans un courant de liquide principal, circulant dans une conduite, dispositif du genre de ceux qui comprennent une pompe à piston différentiel à mouvement alternatif pour prélever l'additif dans un récipient et le doser, cette pompe comportant une première entrée pour recevoir un débit de liquide principal qui assure l'entraînement de la pompe, une seconde entrée pour prélever l'additif et une sortie pour le mélange d'additif et de liquide, le dispositif comprenant un venturi installé dans la conduite, la pompe étant branchée en parallèle du venturi, la première entrée de la pompe étant reliée par une première canalisation à l'entrée du venturi, tandis que la sortie de la pompe est reliée par une deuxième canalisation au col du venturi.The invention relates to a metering device for introducing a liquid additive into a main liquid stream flowing in a pipe, a device of the type comprising a reciprocating differential piston pump for withdrawing the additive into a container. and metering it, said pump comprising a first inlet for receiving a main liquid flow which drives the pump, a second inlet for taking the additive and an outlet for the mixture of additive and liquid, the device comprising a venturi installed in the pipe, the pump being connected in parallel with the venturi, the first inlet of the pump being connected by a first pipe to the inlet of the venturi, while the outlet of the pump is connected by a second pipe to the neck venturi.

Un dispositif de dosage de ce genre est connu d'après EP 1773479 , au nom de la Société déposante, qui permet de traiter des débits élevés de liquide principal avec des pompes de dimensions réduites et d'augmenter la plage de dosages permise. Les pompes à piston différentiel utilisées dans ces dispositifs de dosage sont connues en elles-mêmes, notamment d'après EP 1151196 ou US 6684753 .A dosing device of this kind is known from EP 1773479 , on behalf of the Applicant Company, which allows the treatment of high flow rates of main liquid with smaller pumps and increases the permitted range of dosages. The differential piston pumps used in these metering devices are known per se, in particular according to EP 1151196 or US 6684753 .

Dans une pompe doseuse, le piston différentiel effectue un mouvement alternatif et entraîne un piston plongeur pour prélever l'additif à doser lors d'une course de montée et pour injecter cet additif dans le liquide principal ou liquide moteur lors d'une course de descente. La perte de charge entre la première entrée de la pompe et la sortie est variable selon les phases de fonctionnement de la pompe. Pour un bon rendement énergétique de la pompe, le venturi doit être prévu pour créer une perte de charge entre son entrée et le col sensiblement égale à la perte de charge dans la pompe.In a dosing pump, the differential piston reciprocates and drives a plunger to withdraw the additive to be dosed during a rise stroke and to inject this additive into the main liquid or engine liquid during a down stroke. . The pressure drop between the first input of the pump and the output is variable depending on the operating phases of the pump. For a good energy efficiency of the pump, the venturi must be provided to create a pressure drop between its inlet and the neck substantially equal to the pressure drop in the pump.

Pour les dosages d'additif relativement faibles, notamment inférieurs à 1 % d'additif dans le liquide principal, en particulier lorsque l'on place en dérivation d'un facteur 10 des pompes doseuses dosant jusqu'à 0.3% dans le débit dévié pour obtenir 0.03% dans le débit total, les dispositifs de dosage du genre défini précédemment donnent satisfaction, les différences de perte de charge entre montée et descente du piston différentiel n'étant pas trop importantes. Le rendement du dispositif de dosage reste acceptable, car la perte de charge entre le col du venturi et son entrée n'est pas trop différente de la perte de charge de la pompe lors de la montée et de la descente du piston différentiel.For relatively low additive dosages, especially less than 1% of additive in the main liquid, especially when a 10-fold shunt of metering pumps up to 0.3% in the flow deviated for obtain 0.03% in the total flow, the metering devices of the kind defined above are satisfactory, differences in pressure drop between rise and fall of the differential piston not being too important. The performance of the metering device remains acceptable because the pressure drop between the neck of the venturi and its inlet is not too different from the pressure drop of the pump during the rise and the descent of the differential piston.

Lorsque les dosages de l'additif liquide deviennent plus importants, notamment supérieurs à 2 % dans le débit dévié pour obtenir 0.2% dans le débit total, ou 10 % dans le débit dévié pour obtenir 1% dans le débit total, la différence de perte de charge entre la phase de montée du piston différentiel et la phase de descente devient plus importante. Ce phénomène est d'autant plus présent que la pression dans le système de dosage est importante et que le dosage du doseur en dérivation est important, la perte de charge en montée devant compenser la pression appliquée sur le piston de dosage qui sert à doser l'additif. Il en résulte une diminution de la précision, ou une impossibilité de créer la perte de charge nécessaire au fonctionnement de la pompe doseuse sur une plage de débit importante, typiquement d'un rapport 6 à 10 entre le mini et maxi débit principal.When the dosages of the liquid additive become larger, especially greater than 2% in the deflected flow to obtain 0.2% in the total flow, or 10% in the deflected flow to obtain 1% in the total flow, the difference in loss load between the rise phase of the differential piston and the descent phase becomes more important. This phenomenon is all the more present as the pressure in the metering system is important and the dosing of the bypass metering device is important, the rise pressure drop having to compensate for the pressure applied to the metering piston which is used to dose the metering device. 'additive. This results in a decrease in accuracy, or an impossibility to create the pressure drop required for the operation of the metering pump over a large flow range, typically a ratio of 6 to 10 between the mini and maxi main flow.

L'invention a pour but, surtout, de proposer un dispositif de dosage du genre défini précédemment qui ne présente plus ou à un degré moindre les inconvénients évoqués ci-dessus et qui permet d'optimiser le fonctionnement, en particulier dans le cas où les dosages d'additif sont relativement élevés, notamment supérieurs à 0.2% dans le liquide principal.The object of the invention is, above all, to propose a dosing device of the kind defined above which no longer has or to a lesser degree the disadvantages mentioned above and which makes it possible to optimize the operation, in particular in the case where the Additive dosages are relatively high, especially greater than 0.2% in the main liquid.

Selon l'invention, un dispositif de dosage du genre défini précédemment est caractérisé en ce qu'il comporte :

  • un moyen d'étranglement variable du col du venturi,
  • et un moyen sensible à la perte de charge dans la pompe propre à commander le moyen d'étranglement du col du venturi pour réduire la section de passage lorsque la perte de charge dans la pompe augmente, et pour augmenter la section de passage lorsque la perte de charge dans la pompe diminue.
According to the invention, a dosing device of the kind defined above is characterized in that it comprises:
  • a variable throttling means of the venturi neck,
  • and pressure-sensitive means in the pump adapted to control the venturi neck throttling means to reduce the flow section as the pressure drop in the pump increases, and to increase the flow section when the loss load in the pump decreases.

Avantageusement, le moyen sensible à la perte de charge dans la pompe est constitué par un moyen de comparaison entre la pression au col du venturi et la pression au col d'un deuxième venturi installé sur la première canalisation conduisant à l'entrée de la pompe.Advantageously, the means responsive to the pressure drop in the pump is constituted by a means of comparison between the pressure at the neck of the venturi and the pressure at the neck of a second venturi installed on the first pipe leading to the inlet of the pump. .

L'efficacité du dispositif de dosage selon l'invention est améliorée par une meilleure adéquation entre la perte de charge totale entre l'entrée et la sortie de la pompe et la perte de charge au col du venturi.The efficiency of the metering device according to the invention is improved by a better match between the total pressure drop between the inlet and the outlet of the pump and the pressure drop at the neck of the venturi.

Le moyen d'étranglement variable du col du venturi comprend de préférence un organe monté coulissant selon une direction inclinée par rapport à l'axe géométrique du venturi.The variable throttle means of the venturi neck preferably comprises a member slidably mounted in a direction inclined relative to the geometric axis of the venturi.

Le moyen de comparaison entre les pressions au col des deux venturi peut comprendre un moyen de séparation mobile séparant deux chambres reliées respectivement au col d'un des deux venturis, l'organe d'étranglement étant lié à ce moyen de séparation mobile de sorte qu'une augmentation de pression au col du deuxième venturi relativement à la pression au col du premier venturi provoque une augmentation de l'étranglement du col du premier venturi, et inversement.The means of comparison between the neck pressures of the two venturi may comprise a movable separation means separating two chambers connected respectively to the neck of one of the two venturis, the organ throttling being related to this movable separating means so that an increase in pressure at the neck of the second venturi relative to the pressure at the neck of the first venturi causes an increase in the neck throat of the first venturi, and vice versa.

Avantageusement, le moyen de séparation mobile comprend une membrane.Advantageously, the mobile separation means comprises a membrane.

L'organe coulissant peut être constitué par une lame .Cette lame peut être montée coulissante avec un jeu suffisant, dans un guidage du corps du venturi, pour que la pression au col soit transmise à la chambre située du côté du col.The sliding member may be constituted by a blade .This blade can be slidably mounted with sufficient clearance in a guide of the venturi body, so that the neck pressure is transmitted to the chamber located on the side of the neck.

Selon une autre possibilité, l'organe d'étranglement est constitué par une tige cylindrique. L'extrémité de la tige cylindrique tournée vers le col peut être sensiblement hémisphérique.According to another possibility, the throttle member is constituted by a cylindrical rod. The end of the cylindrical rod facing the neck may be substantially hemispherical.

La tige cylindrique peut être fixée à l'extrémité d'une tige de plus petit diamètre qui traverse de manière étanche une plaque fermant une chambre reliée au col du venturi.The cylindrical shank may be attached to the end of a smaller diameter shank which sealingly traverses a plate closing a chamber connected to the throat of the venturi.

Avantageusement, un canal est situé en amont de l'organe d'étranglement pour assurer une prise de pression qui permet d'effectuer la mesure de débit au col du venturi.Advantageously, a channel is located upstream of the throttle member to provide a pressure tap which allows the flow measurement at the neck of the venturi.

Selon une autre possibilité, la tige cylindrique comporte un canal longitudinal débouchant à son extrémité voisine du col du venturi et relié, à son autre extrémité, à une chambre située du côté du col du venturi.According to another possibility, the cylindrical rod comprises a longitudinal channel opening at its end close to the neck of the venturi and connected at its other end to a chamber located on the side of the neck of the venturi.

La conduite de sortie de la pompe est raccordée au col du venturi par au moins une ouverture latérale relativement à la fixation de la conduite sur le corps du venturi.The outlet pipe of the pump is connected to the neck of the venturi by at least one lateral opening relative to the attachment of the pipe to the body of the venturi.

Avantageusement, le venturi et la pompe forment un ensemble, avec des moyens de raccordement prévus à l'entrée et à la sortie du venturi pour son insertion et son raccordement à deux tronçons de la conduite.Advantageously, the venturi and the pump form an assembly, with connection means provided at the inlet and the outlet of the venturi for insertion and connection to two sections of the pipe.

L'invention consiste, mises à part les dispositions exposées ci-dessus, en un certain nombre d'autres dispositions dont il sera plus explicitement question ci-après à propos d'exemples de réalisation décrits avec référence aux dessins annexés, mais qui ne sont nullement limitatifs. Sur ces dessins :

  • Fig. 1 est une coupe longitudinale verticale d'un dispositif de dosage selon l'invention avec parties en extérieur et parties représentées schématiquement.
  • Fig. 2 est une vue schématique simplifiée, avec parties arrachées, d'une pompe à piston différentiel du type de celle utilisée dans le dispositif de l'invention.
  • Fig. 3 est une vue en perspective du dispositif de dosage de Fig. 1, à plus petite échelle.
  • Fig. 4 est une vue à plus grande échelle du détail IV de Fig. 1 montrant un raccord dans un orifice du corps du venturi.
  • Fig. 5 est une vue de dessus par rapport à Fig. 4, le raccord ayant été retiré.
  • Fig. 6 est une coupe à plus grande échelle suivant un plan orthogonal au plan de Fig. 1, et passant par le plan médian du moyen d'étranglement constitué par une lame.
  • Fig. 7 montre, semblablement à Fig. 1, une variante de réalisation du dispositif de dosage selon l'invention, avec organe d'étranglement constitué par une tige cylindrique.
  • Fig. 8 est une vue en perspective à plus petite échelle du dispositif de Fig. 7.
  • Fig. 9 montre, à plus grande échelle, le détail IX de Fig. 7.
  • Fig. 10 est une vue de dessus par rapport à Fig. 9, le raccord ayant été retiré.
  • Fig. 11 est une coupe de la tige à plus grande échelle, semblable à la coupe de Fig.6.
  • Fig. 12 montre, en coupe longitudinale verticale, une variante du dispositif de dosage de Fig. 7, avec tige cylindrique pleine comme organe d'étranglement.
  • Fig. 13 est une coupe suivant la ligne XIII-XIII de Fig. 12, à plus grande échelle, et
  • Fig. 14 est un détail agrandi de Fig. 13.
The invention consists, apart from the arrangements described above, in a certain number of other arrangements which will be more explicitly discussed hereinafter with regard to exemplary embodiments described with reference to the appended drawings, but which are not in no way limiting. On these drawings:
  • Fig. 1 is a vertical longitudinal section of a metering device according to the invention with parts outside and parts shown schematically.
  • Fig. 2 is a simplified schematic view, with parts torn off, of a differential piston pump of the type used in the the invention.
  • Fig. 3 is a perspective view of the dosing device of Fig. 1 , on a smaller scale.
  • Fig. 4 is a larger-scale view of detail IV of Fig. 1 showing a connection in an orifice of the venturi body.
  • Fig. 5 is a top view with respect to Fig. 4 the fitting has been removed.
  • Fig. 6 is a larger-scale section in a plane orthogonal to the plane of Fig. 1 , and passing through the median plane of the throttling means constituted by a blade.
  • Fig. 7 shows, similarly to Fig. 1 , an alternative embodiment of the metering device according to the invention, with a throttle member constituted by a cylindrical rod.
  • Fig. 8 is a perspective view on a smaller scale of the device of Fig. 7 .
  • Fig. 9 shows, on a larger scale, detail IX of Fig. 7 .
  • Fig. 10 is a top view with respect to Fig. 9 the fitting has been removed.
  • Fig. 11 is a section of the stem on a larger scale, similar to the cut of Fig.6 .
  • Fig. 12 shows, in vertical longitudinal section, a variant of the dosing device of Fig. 7 , with solid cylindrical rod as throttle.
  • Fig. 13 is a section along line XIII-XIII of Fig. 12 , on a larger scale, and
  • Fig. 14 is an enlarged detail of Fig. 13 .

En se reportant aux dessins, notamment à Fig. 1 à 3, on peut voir un dispositif de dosage D pour introduire un additif liquide A dans un courant de liquide principal L circulant dans une conduite 1 sommairement représentée. Le liquide principal est généralement de l'eau mais le dispositif D peut convenir à toutes sortes de liquides. L'additif liquide A est contenu dans un récipient 2 schématiquement représenté.Referring to the drawings, in particular Fig. 1 to 3 , it is possible to see a dosing device D for introducing a liquid additive A into a main liquid stream L flowing in a pipe 1 roughly represented. The main liquid is usually water but the device D can be suitable for all kinds of liquids. The liquid additive A is contained in a container 2 schematically represented.

Le dispositif D comprend une pompe 3 disposée avec son axe vertical. La pompe 3 est d'un type connu, notamment fabriquée et commercialisée par la Société déposante. Un exemple de telles pompes est décrit dans EP 1 151 196 ou US 6 684 753 . Comme illustré schématiquement sur Fig. 2, la pompe 3 comporte un piston différentiel 4 à mouvement alternatif qui entraîne un piston 5 de plus petit diamètre pour prélever l'additif dans le récipient 2 et le doser. Le piston plongeur 5 coulisse dans une chambre cylindrique d'une pompe auxiliaire 6 reliée par un tube de prélèvement 7 au récipient 2. Le tube 7 plonge dans l'additif A à prélever.Device D comprises a pump 3 arranged with its vertical axis. The pump 3 is of a known type, in particular manufactured and marketed by the applicant company. An example of such pumps is described in EP 1 151 196 or US 6,684,753 . As illustrated schematically on Fig. 2 the pump 3 comprises a reciprocating differential piston 4 which drives a piston 5 of smaller diameter to withdraw the additive in the container 2 and dose it. The plunger 5 slides in a cylindrical chamber of an auxiliary pump 6 connected by a sampling tube 7 to the container 2. The tube 7 is immersed in the additive A to be withdrawn.

Des moyens classiques à clapets, ou analogues, sont prévus pour commander les mouvements alternatifs du piston différentiel 4. Ces moyens connus ne sont pas représentés ni décrits.Conventional valve means, or the like, are provided for controlling the reciprocating movements of the differential piston 4. These known means are not shown or described.

La pompe 3 comprend une première entrée 8 pour recevoir un débit de liquide principal qui assure l'entraînement du piston différentiel 4. La pompe 3 comporte une seconde entrée 9 située en partie basse du corps de la pompe auxiliaire 6 pour le prélèvement de l'additif A, et une sortie 10 pour le mélange dosé d'additif A et de liquide principal L.The pump 3 comprises a first inlet 8 for receiving a main liquid flow which drives the differential piston 4. The pump 3 comprises a second inlet 9 located in the lower part of the body of the auxiliary pump 6 for sampling the additive A, and an outlet 10 for the mixed mixture of additive A and main liquid L.

Le dispositif D comprend un venturi 11 installé dans la conduite 1. La première entrée 8 de la pompe est reliée par une première canalisation 12 à l'entrée du venturi, tandis que la sortie 10 de la pompe est reliée par une deuxième canalisation 13 au col du venturi. La pompe 3 est ainsi branchée en parallèle du venturi.The device D comprises a venturi 11 installed in the pipe 1. The first inlet 8 of the pump is connected by a first pipe 12 to the inlet of the venturi, while the outlet 10 of the pump is connected by a second pipe 13 to the venturi collar. The pump 3 is thus connected in parallel with the venturi.

Le dispositif D, selon l'invention, comporte un moyen d'étranglement variable E du col du venturi 11, et un moyen G sensible à la perte de charge dans la pompe 3 pour commander le moyen d'étranglement E du col du venturi.The device D according to the invention comprises a variable throttling means E of the neck of the venturi 11, and a means G responsive to the pressure drop in the pump 3 for controlling the throttling means E of the neck of the venturi.

Le moyen d'étranglement variable E, selon la réalisation des Fig.1-6, comprend une lame 14 montée coulissante selon une direction inclinée d'amont en aval par rapport à l'axe géométrique du venturi 11. Selon Fig.1 l'angle d'inclinaison, tourné vers l'amont, formé entre la lame 14 et l'axe géométrique du venturi est d'environ 70°.The variable throttling means E, according to the realization of the Fig.1-6 , comprises a slide 14 slidably mounted in an inclined direction from upstream to downstream with respect to the geometric axis of the venturi 11. According to Fig.1 the angle of inclination, turned upstream, formed between the blade 14 and the geometric axis of the venturi is about 70 °.

La lame 14 est disposée dans une embase 15 sensiblement cylindrique, en saillie sur le corps du venturi 11, cette embase étant surmontée par un couvercle 16. L'embase et le couvercle définissent un logement cylindrique d'axe géométrique incliné par rapport à l'axe géométrique du venturi. La lame 14 est située dans un plan orthogonal au plan vertical passant par l'axe géométrique du venturi11. La lame 14 traverse une fente prévue dans la paroi du col du venturi et peut faire saillie par son extrémité inférieure 14a dans le col 11c du venturi. L'extrémité 14a, comme visible sur Fig. 6, est en forme d'arc de cercle concave. La lame 14 coulisse dans un guidage du corps du venturi avec un jeu j (Fig. 6) suffisant pour que la pression au col 11c du venturi soit transmise à une chambre 17 située du côté du col et limitée par une membrane souple déformable 18 dont la périphérie est serrée de manière étanche entre l'embase 15 et le couvercle 16, assemblés de manière démontable par des vis, ou analogues.The blade 14 is disposed in a substantially cylindrical base 15, projecting from the body of the venturi 11, this base being surmounted by a cover 16. The base and the cover define a cylindrical housing with a geometric axis inclined with respect to the geometric axis of the venturi. The blade 14 is located in a plane orthogonal to the vertical plane passing through the geometric axis of the venturi11. The blade 14 passes through a slot provided in the wall of the neck of the venturi and can project from its lower end 14a in the neck 11c of the venturi. The end 14a, as visible on Fig. 6 , is in the shape of a concave arc. The blade 14 slides in a guide of the venturi body with a clearance j ( Fig. 6 ) sufficient for the pressure at the neck 11c of the venturi is transmitted to a chamber 17 located on the side of the neck and limited by a flexible deformable membrane 18 whose periphery is tightly sealed between the base 15 and the cover 16, assembled dismountable manner by screws, or the like.

Le venturi 11 de manière classique comporte un convergent, situé en amont du col 11c, et un divergent en aval du col. Par « col 11c » on désigne une zone du venturi, dont l'étendue axiale peut être relativement longue, qui présente un diamètre réduit relativement au diamètre d'entrée et de sortie..The venturi 11 conventionally comprises a convergent, located upstream of the neck 11c, and a divergent downstream of the neck. By "neck 11c" is meant an area of the venturi, whose axial extent may be relatively long, which has a reduced diameter relative to the inlet and outlet diameter.

La canalisation de sortie 13 de la pompe est reliée par un raccord 19 vissé de manière étanche, avec joint, dans un trou taraudé 20 prévu à la périphérie du corps du venturi. L'axe géométrique du trou 20 est situé dans un plan orthogonal au plan de la lame 14, et passant par l'axe géométrique du venturi. Comme visible sur Fig. 3, le corps du venturi comporte des nervures 22 décalées angulairement de 90° et le trou taraudé 20 est réalisé dans un noyau cylindrique 21 d'axe géométrique orthogonal à celui du venturi et débordant de part et d'autre d'une nervure 22 à laquelle il se raccorde. Le trou 20 ne débouche pas directement dans le col du venturi, dont il est séparé suivant la direction de l'axe géométrique du trou 20 par une paroi de fond 23. De part et d'autre transversalement de cette paroi 23 est prévue une gorge 24 qui débouche dans le col du venturi selon une fenêtre latérale 25 dont la position angulaire est décalée sensiblement de 90° par rapport au trou taraudé 20 de raccordement de la canalisation de sortie 13..The outlet pipe 13 of the pump is connected by a connection 19 screwed sealingly, with seal, into a threaded hole 20 provided at the periphery of the body of the venturi. The geometric axis of the hole 20 is located in a plane orthogonal to the plane of the blade 14, and passing through the geometric axis of the venturi. As visible on Fig. 3 , the body of the venturi comprises ribs 22 angularly offset by 90 ° and the threaded hole 20 is formed in a cylindrical core 21 of geometric axis orthogonal to that of the venturi and overflowing on either side of a rib 22 to which it connects. The hole 20 does not open directly into the neck of the venturi, from which it is separated in the direction of the geometric axis of the hole 20 by a bottom wall 23. On either side transversely of this wall 23 is provided a throat 24 which opens into the neck of the venturi according to a side window 25 whose angular position is shifted substantially 90 ° relative to the threaded hole 20 for connecting the outlet pipe 13.

Cette disposition avec au moins une, et de préférence deux fenêtres latérales 25 pour l'injection du mélange de liquide et d'additif dans le courant principal de liquide, au voisinage du col du venturi, permet de réduire les turbulences.This arrangement with at least one, and preferably two side windows 25 for the injection of the mixture of liquid and additive in the main stream of liquid, in the vicinity of the neck of the venturi, reduces turbulence.

Un clapet 26 pour casser le vide est diamétralement opposé au raccord 19 et communique avec le col du venturi. Le clapet 26, éventuellement relié à un drain en cas de fuite, s'ouvre en cas de dépression aval pour éviter de siphonner la cuve de produit.A valve 26 to break the vacuum is diametrically opposite the connector 19 and communicates with the venturi neck. The valve 26, possibly connected to a drain in case of leakage, opens in case of downstream depression to avoid siphoning the product tank.

Le moyen G sensible à la perte de charge dans la pompe 3 comprend un moyen de comparaison entre la pression au col du venturi 11 et la pression au col d'un deuxième venturi 27 installé sur la première canalisation 12 conduisant à l'entrée 8 de la pompe. Le moyen G est avantageusement constitué par la membrane 18 selon l'exemple de réalisation des dessins.The means G sensitive to the pressure drop in the pump 3 comprises a means for comparing the pressure at the neck of the venturi 11 and the neck pressure of a second venturi 27 installed on the first pipe 12 leading to the inlet 8 of the pump. The means G is advantageously constituted by the membrane 18 according to the embodiment of the drawings.

Le deuxième venturi 27 est prévu dans un bloc solidaire du couvercle 16. L'axe géométrique du venturi 27 est orthogonal à l'axe géométrique du premier venturi 11. L'entrée du convergent du deuxième venturi 27 est constituée par une ouverture débouchant dans l'entrée du venturi 11. Le col du deuxième venturi 27 est relié, par une conduite transversale 28, à une chambre 29 prévue dans le couvercle 16 et située du côté de la membrane 18 éloigné du premier venturi 11. Le divergent du venturi 27 est tourné vers la pompe 3 et est raccordé à la conduite 12.The second venturi 27 is provided in a block secured to the lid 16. The geometric axis of the venturi 27 is orthogonal to the geometric axis of the first venturi 11. The inlet of the convergent of the second venturi 27 is constituted by an opening opening into the The neck of the second venturi 27 is connected, by a transverse pipe 28, to a chamber 29 provided in the cover 16 and located on the side of the diaphragm 18 remote from the first venturi 11. The divergent venturi 27 is turned towards pump 3 and is connected to the pipe 12.

Ceci étant, le fonctionnement du dispositif de dosage selon l'invention est le suivant.This being so, the operation of the metering device according to the invention is as follows.

Un courant de liquide principal L circule dans la conduite 1 sous une pression statique de 1 à 6 bars généralement. Au col du venturi 11, la vitesse d'écoulement du fluide augmente et sa pression statique diminue. La différence de pression entre l'entrée du venturi 11 et le col permet de faire fonctionner la pompe 3 et d'actionner le piston différentiel à l'aide d'une fraction du courant principal dérivée par le deuxième venturi 27 et la conduite 12.A main liquid stream L flows in line 1 under a static pressure of 1 to 6 bars generally. At the neck of the venturi 11, the flow velocity of the fluid increases and its static pressure decreases. The difference in pressure between the inlet of the venturi 11 and the collar makes it possible to operate the pump 3 and to actuate the differential piston by means of a fraction of the main stream derived by the second venturi 27 and the pipe 12.

La pompe auxiliaire 6 entraînée par les mouvements alternatifs du piston différentiel 4 prélève des doses d'additif A dans le récipient 2 et le mélange dosé est injecté au col du venturi par la conduite 13 à travers les fenêtres 25.The auxiliary pump 6 driven by the reciprocating movements of the differential piston 4 takes doses of additive A in the container 2 and the metered mixture is injected into the neck of the venturi via the pipe 13 through the windows 25.

Lors de la montée du piston différentiel 4 et du piston plongeur 5, la perte de charge entre l'entrée 8 et la sortie 10 de la pompe 3 est plus importante qu'à la descente, et la pression au col du deuxième venturi 27 augmente par rapport à celle régnant au col du premier venturi 11.During the rise of the differential piston 4 and the plunger 5, the pressure drop between the inlet 8 and the outlet 10 of the pump 3 is greater than on the descent, and the pressure at the neck of the second venturi 27 increases. compared to that prevailing at the neck of the first venturi 11.

Dans ces conditions, la pression dans la chambre 29 devient supérieure à celle régnant dans la chambre 17 et la membrane 18 se déforme pour permettre à la lame 14 de coulisser et d'entrer davantage dans le col du venturi 11. Il en résulte une augmentation de la perte de charge entre l'entrée et le col du venturi 11, ce qui permet d'égaliser la perte de charge au col du venturi 11 et la perte de charge entre l'entrée 8 et la sortie 10 de la pompe 3, ou tout au moins de minimiser la différence entre ces pertes de charge, ce qui contribue à améliorer l'efficacité et le rendement de fonctionnement de la pompe.Under these conditions, the pressure in the chamber 29 becomes greater than that prevailing in the chamber 17 and the membrane 18 is deformed to allow the blade 14 to slide and to enter further into the neck of the venturi 11. This results in an increase the pressure drop between the inlet and the neck of the venturi 11, which makes it possible to equalize the pressure drop at the neck of the venturi 11 and the pressure drop between the inlet 8 and the outlet 10 of the pump 3, or at least to minimize the difference between these pressure drops, which contributes to improving the efficiency and the operating efficiency of the pump.

Lors de la descente du piston différentiel 4 et du piston plongeur 5, la perte de charge entre l'entrée et la sortie de la pompe 3 est plus faible, de sorte que la lame 14 remonte dans la chambre 17 et diminue l'étranglement du col du venturi 11 et donc la perte de charge entre convergent et col du venturi 11.During the descent of the differential piston 4 and the plunger 5, the pressure drop between the inlet and the outlet of the pump 3 is lower, so that the blade 14 rises in the chamber 17 and decreases the throttling. venturi neck 11 and thus the pressure drop between convergent and venturi neck 11.

Ainsi, la lame 14 et la membrane 18 vont osciller à la vitesse du piston différentiel 4 pour assurer une meilleure adéquation entre la perte de charge au col du venturi 11 et la perte de charge totale dans la pompe 3.Thus, the blade 14 and the membrane 18 will oscillate at the speed of the differential piston 4 to ensure a better match between the pressure drop at the neck of the venturi 11 and the total pressure drop in the pump 3.

L'efficacité du dispositif de dosage est conservée lorsque les dosages sont relativement élevés, notamment supérieurs à 0.2 % d'additif A dans le débit principal, et jusqu'à 1% dans le débit principal.The effectiveness of the dosing device is maintained when the dosages are relatively high, especially greater than 0.2% of additive A in the main flow, and up to 1% in the main flow.

La plage de travail du dispositif selon l'invention est élargie. Le démarrage à petit débit est fiabilisé, ce qui permet de débuter avec un faible débit (en particulier le débit mini est de 6 à 10 fois plus faible que le débit maxi) et d'augmenter ce débit après démarrage tout en conservant un dosage précis et une bonne efficacité de fonctionnement.The working range of the device according to the invention is enlarged. The low-speed start is made reliable, which makes it possible to start with a low flow rate (in particular the minimum flow rate is 6 to 10 times lower than the maximum flow rate) and increase this flow rate after startup while maintaining a precise dosage and good operating efficiency.

En se reportant aux Figs. 7-11, on peut voir une variante de réalisation du dispositif de dosage D. Les éléments de ce dispositif identiques ou similaires à des éléments déjà décrits à propos de la réalisation précédente sont désignés par les mêmes références numériques ou littérales sans que leur description soit reprise.Referring to Figs. 7-11 , an alternative embodiment of the dosing device D can be seen. The elements of this device that are identical or similar to elements already described with respect to the previous embodiment are designated by the same numerical or literal references without their description being repeated.

Selon cette variante de réalisation, le moyen d'étranglement variable E du col du venturi 11 est constitué par une tige cylindrique 30 montée coulissante selon une direction inclinée d'amont en aval sur l'axe géométrique du venturi 11. L'inclinaison est d'environ 50° selon l'exemple représenté. La tige cylindrique 30 est montée coulissante dans un alésage 31 du corps du venturi qui débouche au col. L'extrémité 32 de la tige tournée vers le col du venturi est sensiblement hémisphérique. La tige 30 comporte un canal longitudinal 33, de préférence axial, qui débouche vers le col du venturi à l'extrémité 32 et qui est relié, à son autre extrémité, à une canalisation radiale 34 qui débouche dans la chambre 17 située du côté de la membrane 18 tourné vers le venturi. La tige 30 est liée à la membrane 18 qui détermine, du côté opposé à la chambre 17, l'autre chambre 29 reliée au col du deuxième venturi 27 par la conduite 28.According to this variant embodiment, the variable throttling means E of the neck of the venturi 11 is constituted by a cylindrical rod 30 slidably mounted in an inclined direction from upstream to downstream on the geometric axis of the venturi 11. The inclination is approximately 50 ° according to the example shown. The cylindrical rod 30 is slidably mounted in a bore 31 of the body of the venturi which opens at the neck. The end 32 of the rod turned towards the neck of the venturi is substantially hemispherical. The rod 30 comprises a longitudinal channel 33, preferably axial, which opens towards the throat of the venturi at the end 32 and which is connected at its other end to a radial duct 34 which opens into the chamber 17 situated on the the membrane 18 facing the venturi. The rod 30 is connected to the membrane 18 which determines, on the side opposite the chamber 17, the other chamber 29 connected to the neck of the second venturi 27 by the pipe 28.

La pression au col du venturi 11 est transmise à la chambre 17 par le canal longitudinal 30 et la canalisation transversale 34.The pressure at the neck of the venturi 11 is transmitted to the chamber 17 via the longitudinal channel 30 and the transverse duct 34.

Le fonctionnement du dispositif de dosage des Fig. 7-11 est semblable à celui décrit à propos des figures précédentes. La tige cylindrique 30 avec son extrémité hémisphérique permet de réduire les turbulences dans l'écoulement et d'améliorer le rendement global.The operation of the dosing device Fig. 7-11 is similar to that described in the previous figures. The cylindrical rod 30 with its hemispherical end makes it possible to reduce the turbulence in the flow and to improve the overall efficiency.

En se reportant aux Fig. 12-13, on peut voir une variante de réalisation avantageuse du dispositif de dosage des Fig. 7-11. Les éléments identiques à des éléments de Fig. 7-11 sont désignés par les mêmes références numériques ou littérales, sans que leur description soit reprise.Referring to Fig. 12-13 , we can see an advantageous variant embodiment of the dosing device of Fig. 7-11 . Elements identical to elements of Fig. 7-11 are designated by the same numerical or literal references, without their description being repeated.

Selon cette variante, la prise de pression qui permet de faire la mesure du débit au col 11 c du venturi est assurée par un canal 35 situé en amont de la tige ou lame cylindrique 30a, dont la paroi extérieure est continue. Le canal longitudinal de la réalisation de Fig. 7 est supprimé.According to this variant, the pressure tap that makes it possible to measure the flow at the neck 11c of the venturi is provided by a channel 35 located upstream of the rod or cylindrical blade 30a, whose outer wall is continuous. The longitudinal channel of the realization of Fig. 7 is deleted.

La lame cylindrique 30a, à extrémité inférieure hémisphérique 32a, est fixée à l'extrémité d'une tige 36, de plus petit diamètre que 30a. La membrane 18 est fixée à l'extrémité élargie de la tige 36 distante de la lame 30a.The cylindrical blade 30a, hemispherical lower end 32a, is attached to the end of a rod 36, smaller in diameter than 30a. The membrane 18 is attached to the widened end of the rod 36 remote from the blade 30a.

Le canal 35 fait communiquer la zone du col du venturi 11 avec la chambre 17 située sous la membrane 18. La tige 36 traverse une plaque 37 (Fig. 14) fermant la chambre 17 du côté du col 11 c du venturi. La plaque 37 est traversée par un passage prolongeant le canal 35 et débouchant dans la chambre 17.The channel 35 communicates the area of the neck of the venturi 11 with the chamber 17 located under the membrane 18. The rod 36 passes through a plate 37 (FIG. Fig. 14 ) closing the chamber 17 on the side of the neck 11 c of the venturi. The plate 37 is traversed by a passage extending the channel 35 and opening into the chamber 17.

Avantageusement, une étanchéité sur la tige 36 est assurée par une bague d'étanchéité 38, au niveau de la traversée de la plaque 37. Une amélioration sur la vitesse de réaction de la lame 30a est obtenue en réduisant ainsi la section soumise à la pression régnant au col du venturi par l'aménagement d'une étanchéité sur la tige 36 de plus petit diamètre. La lame 30a coulisse avec un jeu radial suffisant dans son logement pour le passage du liquide ; sa face avant 32a et sa face arrière sont exposées à la même pression de liquide.Advantageously, a seal on the rod 36 is provided by a sealing ring 38, at the crossing of the plate 37. An improvement in the reaction speed of the blade 30a is obtained thereby reducing the section subjected to pressure prevailing at the venturi neck by providing a seal on the rod 36 of smaller diameter. The blade 30a slides with a sufficient radial clearance in its housing for the passage of the liquid; its front face 32a and its rear face are exposed to the same liquid pressure.

Les pressions de pilotage de part et d'autre de la membrane 18 doivent s'équilibrer lorsque le ratio de division est atteint et donne la position d'équilibre de la membrane. Cette condition est satisfaite si, idéalement, les pressions et sections sont les mêmes donc les efforts identiques. On cherche à minimiser pour cet état d'équilibre l'introduction de la tige ou lame de commande dans le flux principal pour minimiser la perte de charge.The piloting pressures on either side of the membrane 18 must be balanced when the division ratio is reached and gives the equilibrium position of the membrane. This condition is satisfied if, ideally, the pressures and sections are the same, so the efforts are identical. It is sought to minimize for this equilibrium state the introduction of the rod or control blade in the main flow to minimize the pressure drop.

Dans la version à tige cylindrique, la section de tige soumise à la pression n'est plus négligeable devant la section active de membrane. Aussi selon la variante des Fig. 12-14 :

  • la section de membrane active est augmentée
  • l'influence de la section de tige soumise à une pression au col est diminuée par une étanchéité de plus petit diamètre.
In the cylindrical rod version, the rod section subjected to pressure is no longer negligible in front of the active membrane section. Also according to the variant of Fig. 12-14 :
  • the active membrane section is increased
  • the influence of the stem section subjected to pressure at the neck is reduced by a smaller diameter seal.

Ces conditions ont montré par les essais, que la lecture de débit par les pressions de pilotage est mieux respectée et que le système réagit plus vite par la diminution de l'effort résistant dû au champ de pression s'appliquant sur la tige de commande.These conditions have shown by the tests, that the reading of flow by the pilot pressures is better respected and that the system reacts faster by the reduction of the resisting force due to the pressure field applied to the control rod.

L'invention n'est pas limitée aux modes de réalisation décrits avec référence aux dessins mais elle englobe les variantes possibles du moyen d'étranglement variable du col du venturi et du moyen sensible à la perte de charge dans la pompe. En particulier, le moyen d'étranglement pourrait être constitué par un volet d'étranglement pivotant prévu dans le col du venturi et commandé par le moyen sensible à la perte de charge. La membrane 18 pourrait être remplacée par un piston mobile dans un logement cylindrique, définissant les deux chambres 17 et 29, les déplacements du piston commandant ceux de la lame 14 ou de la tige 30.The invention is not limited to the embodiments described with reference to the drawings, but it encompasses the possible variants of the variable throat means of the neck of the venturi and the means responsive to the pressure drop in the pump. In particular, the throttling means could be constituted by a pivoting throttle flap provided in the neck of the venturi and controlled by the pressure-sensitive means. The membrane 18 could be replaced by a piston movable in a cylindrical housing, defining the two chambers 17 and 29, the displacements of the piston controlling those of the blade 14 or the rod 30.

La géométrie du venturi 11 peut être ajustée pour établir en fonctionnement à col 11 c complètement ouvert, à plein débit une perte de charge au col de 2.6 bars, et obtenir une perte de charge inférieure à 1.5 bars pour des dosages à 1%.The geometry of the venturi 11 can be adjusted to establish in operation at neck 11 c completely open, at full flow a pressure drop at the neck of 2.6 bars, and obtain a pressure drop of less than 1.5 bars for dosages at 1%.

Claims (14)

  1. A metering device for introducing a liquid additive into a stream of main liquid flowing in a pipe, the device comprising a reciprocating differential piston pump (3) for taking up the additive in a container and metering it, this pump comprising a first inlet (8) for receiving a main liquid flow that drives the pump, a second inlet (9) for taking up the additive and an outlet (10) for mixing the additive and the main liquid, the device comprising a venturi (11) arranged in the pipe, the pump (3) being connected in parallel with the venturi (11), the first inlet (8) of the pump being connected via a first line (12) to the inlet of the venturi while the outlet (10) of the pump is connected via a second line (13) to the throat (11c) of the venturi, characterized in that it comprises:
    - a means for varying the constriction (E) of the throat (11c) of the venturi,
    - and a means (G) sensitive to the pressure drop in the pump (3), which means is able to control the means for constricting (E) the throat of the venturi to reduce the passage cross section when the pressure drop in the pump increases, and to increase the passage cross section when the pressure drop in the pump decreases.
  2. The device as claimed in claim 1, characterized in that the means (G) sensitive to the pressure drop in the pump consists of a means for comparing the pressure at the throat (11c) of the venturi (11) with the pressure at the throat of a second venturi (27) arranged on the first line (12) leading to the inlet (8) of the pump.
  3. The device as claimed in claim 1 or 2, characterized in that the means for varying the constriction of the throat of the venturi comprises a member (14, 30, 30a) which is mounted so as to be able to slide in a direction inclined with respect to the geometric axis of the venturi (11).
  4. The device as claimed in claim 2, characterized in that the means for comparing the pressures at the throats of the two venturis (11, 27) comprises a movable separation means separating two chambers (17, 29) connected respectively to the throat of one of the two venturis (11, 27), the constriction member being connected to this movable separation means such that a pressure increase at the throat of the second venturi (27) relative to the pressure at the throat of the first venturi (11) causes an increase in the constriction of the throat of the first venturi, and vice-versa.
  5. The device as claimed in claim 4, characterized in that the movable separation means comprises a membrane (18).
  6. The device as claimed in claim 3, characterized in that the sliding member consists of a vane (14).
  7. The device as claimed in claim 3, characterized in that the constriction member consists of a cylindrical rod (30, 30a).
  8. The device as claimed in claim 7, characterized in that that end (32, 32a) of the cylindrical rod (30, 30a) which is oriented toward the throat is essentially hemispherical.
  9. The device as claimed in claim 7 or 8, characterized in that the cylindrical rod (30a) is attached to the end of a smaller-diameter rod (36) which passes in a sealed manner through a plate (37) closing a chamber (17) connected to the throat of the venturi (11).
  10. The device as claimed in any one of claims 7 to 9, characterized in that it comprises a duct (35) located upstream of the constriction member (30a) to provide a pressure tapping by means of which it is possible to measure the flow rate at the throat of the venturi.
  11. The device as claimed in claim 6, characterized in that the vane (14) is mounted so as to be able to slide, with sufficient gap (j), in a guide of the body of the venturi such that the pressure at the throat (11c) is transmitted to a chamber (17) located on the side of the throat (11c) of the venturi.
  12. The device as claimed in claim 7 or 8, characterized in that the cylindrical rod comprises a longitudinal duct (33) which opens at its end on the side of the throat of the venturi (11) and is connected, at its other end, to a chamber (17) located on the side of the throat (11c) of the venturi.
  13. The device as claimed in any one of the preceding claims, characterized in that the outlet line (13) of the pump is connected to the throat of the venturi via at least one opening (25) which is lateral with respect to the attachment of the line on the body of the venturi.
  14. The device as claimed in any one of the preceding claims, characterized in that the venturi (11) and the pump (3) form an assembly, with connection means provided at the inlet and the outlet of the venturi (11) such that it can be inserted into and connected to two sections of the pipe (1).
EP13826872.7A 2013-01-17 2013-12-17 Metering device for introducing a liquid additive into a stream of main liquid Active EP2946110B1 (en)

Priority Applications (1)

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PL13826872T PL2946110T3 (en) 2013-01-17 2013-12-17 Metering device for introducing a liquid additive into a stream of main liquid

Applications Claiming Priority (2)

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FR1350397A FR3001003B1 (en) 2013-01-17 2013-01-17 ASSAY DEVICE FOR INTRODUCING A LIQUID ADDITIVE IN A MAIN LIQUID CURRENT.
PCT/IB2013/061042 WO2014111770A1 (en) 2013-01-17 2013-12-17 Metering device for introducing a liquid additive into a stream of main liquid

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EP2946110B1 true EP2946110B1 (en) 2016-11-23

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EP (1) EP2946110B1 (en)
JP (1) JP6300825B2 (en)
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IL239979A0 (en) 2015-08-31
MX370015B (en) 2019-11-28
PT2946110T (en) 2017-01-13
FR3001003B1 (en) 2015-03-20
CA2897457C (en) 2017-10-17
JP6300825B2 (en) 2018-03-28
IL239979B (en) 2020-08-31
EA201591336A1 (en) 2015-11-30
WO2014111770A1 (en) 2014-07-24
HUE031933T2 (en) 2017-08-28
AR094500A1 (en) 2015-08-05
MX2015009227A (en) 2016-04-25
ES2609034T3 (en) 2017-04-18
CA2897457A1 (en) 2014-07-24
CN105026754A (en) 2015-11-04
EP2946110A1 (en) 2015-11-25
BR112015016794A2 (en) 2017-07-11
WO2014111770A8 (en) 2015-09-03
KR20150110578A (en) 2015-10-02
SG11201505583SA (en) 2015-08-28
FR3001003A1 (en) 2014-07-18
NZ710112A (en) 2017-12-22
HK1216436A1 (en) 2016-11-11
AU2013373659B2 (en) 2016-12-22
DK2946110T3 (en) 2017-02-06
PL2946110T3 (en) 2017-06-30
JP2016509649A (en) 2016-03-31
US10197071B2 (en) 2019-02-05
AU2013373659A1 (en) 2015-08-06
CN105026754B (en) 2017-04-26
KR102144559B1 (en) 2020-08-13
EA027193B1 (en) 2017-06-30
US20150361994A1 (en) 2015-12-17
MY182941A (en) 2021-02-05

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