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EP4301981B1 - Method and pump for low-flow proportional metering - Google Patents

Method and pump for low-flow proportional metering Download PDF

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Publication number
EP4301981B1
EP4301981B1 EP22709673.2A EP22709673A EP4301981B1 EP 4301981 B1 EP4301981 B1 EP 4301981B1 EP 22709673 A EP22709673 A EP 22709673A EP 4301981 B1 EP4301981 B1 EP 4301981B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic machine
axis
outlet
metering pump
proportional metering
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.)
Active
Application number
EP22709673.2A
Other languages
German (de)
French (fr)
Other versions
EP4301981C0 (en
EP4301981A1 (en
Inventor
Thibault MARION
Richard MAHIEUX
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
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Dosatron International SAS
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Publication of EP4301981A1 publication Critical patent/EP4301981A1/en
Application granted granted Critical
Publication of EP4301981C0 publication Critical patent/EP4301981C0/en
Publication of EP4301981B1 publication Critical patent/EP4301981B1/en
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Classifications

    • 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
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/047—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being pin-and-slot mechanisms
    • 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
    • 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
    • F04B23/02—Pumping installations or systems having reservoirs
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/16—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity
    • F17D1/17—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity by mixing with another liquid, i.e. diluting

Definitions

  • the present invention relates to a method and a proportional dosing pump for introducing a liquid additive into a main liquid stream, circulating in a pipe, the pump being of the differential piston type with reciprocating movement for taking the additive from a container and dosing it, this pump comprising a first inlet for receiving a flow of main liquid which ensures the driving of the pump, a second inlet for taking the additive and an outlet for the mixture of additive and liquid.
  • the differential piston performs a reciprocating movement and drives a plunger piston to take up the additive to be dosed during an upstroke and to inject this additive into the main liquid or engine liquid during a downstroke.
  • Another dosing pump known in the prior art is disclosed by the document FR 2 681 646 Al; the pump of this document does not however comprise a volumetric pump provided with an axis of rotation, and a motion converter provided for transforming the reciprocating translational motion of the hydraulic machine into a rotational motion transmitted to the axis of rotation of the volumetric pump.
  • the proportional dosing pump can no longer provide such dosage.
  • the proportional dosing pump then provides a dosage much higher than what is required.
  • the invention aims, above all, to propose a method and a proportional dosing pump which no longer have, or to a lesser degree, the drawbacks mentioned above and which make it possible to optimize the operation of proportional dosing pumps, in particular in the case where the targeted dosages are low.
  • the invention is based in particular on the replacement of previous metering mechanisms by volumetric type pumps, i.e. pumps in which the transfer of the fluid is done by means of a volume displacement at each cycle.
  • the flow rate of a volumetric pump is then proportional to the speed of actuation of its moving elements and depends very little on the discharge pressure.
  • the invention is based, according to a preferred embodiment, on the replacement of the previous dosing mechanisms by peristaltic type pumps, that is to say pumps capable of sucking and discharging a liquid when they operate at low speed, that is to say at speeds lower than a few revolutions per hour.
  • the volumetric pump may be a peristaltic pump.
  • the pump may further comprise a variator provided for adjusting the speed of rotation from the motion converter.
  • the motion converter may comprise a rotor provided with at least one helical rail and an actuator which each extend longitudinally along the longitudinal axis (x), the actuator being connected at one of its ends to the member of the hydraulic machine and cooperating with the helical rail of the rotor, as well as an output connected in rotation to the rotor and preferably in the form of a pinion, the raising and then lowering of the member inducing the rotation of the rotor in the same direction.
  • the actuator may comprise a shaft connected to the hydraulic machine member, a first axis mounted perpendicularly on the actuator shaft, the first axis being provided to slide at a first end in a first rectilinear rail arranged in the body of the motion converter, while the second axis is provided to slide at a first end in a first helical rail arranged on the rotor.
  • the actuator may comprise a shaft connected to the hydraulic machine member, a first axis and a second axis mounted perpendicularly on the actuator shaft, the first axis being provided to slide at a first end and at a second end respectively in a first straight rail and in a second straight rail arranged in the body of the motion converter, while the second axis is provided to slide at a first end and at a second end respectively in a first helical rail and in a second helical rail arranged on the rotor.
  • the shaft can be connected to the hydraulic machine member by means of a pivot connection.
  • the variator can comprise an output shaft, a toothed cone, the axis of revolution of which is inclined relative to the output shaft, such that one of its profile edges extends parallel to the output shaft, a roller integral in rotation with the output shaft and capable of translating along the output shaft, the output pinion of the converter meshing with the toothed wheel of the cone, the toothed cone driving the roller in rotation by adhesion as well as the output shaft, itself driving the shaft of the volumetric pump.
  • the variator can further comprise means for adjusting the position of the roller on the output axis of the variator, these means comprising a support for fixing the roller, furthermore secured to a stuffing box mounted on the body of the rotor and the tightening/loosening of which on the body of the rotor allows the movement of the roller along the output axis of the variator.
  • the variator may include disengaging means making it possible to move the surface of the cone away from the roller, so as to prevent the roller from being driven by adhesion.
  • the disengaging means may consist of a pull rod passing through a support secured to the body of the motion converter and anchored in the toothed cone, and of a spring mounted compressed on said pull rod to press the cone against the roller, a pull on said pull rod further compressing the spring and making it possible to move the cone away from the roller.
  • the proportional metering pump can include an injection T supplied by the output of the hydraulic machine and by the output of the volumetric pump.
  • the injection T can be provided with a first non-return valve and a second non-return valve provided respectively to prevent backflow towards the hydraulic machine and towards the volumetric pump.
  • the hydraulic machine 1 comprises a differential hydraulic piston 16 with reciprocating motion contained in a casing 190 consisting of a cylindrical body extending along an axis (x) and topped with a cover 191 assembled to the body in a removable manner, in particular by screwing.
  • the member also called differential piston 16 is arranged in the casing 190 to slide in reciprocating motion along the axis (x).
  • the member 16 comprises, in the upper part, an upper crown 160 of large section, the periphery of which bears in a sealed manner against the internal wall of the casing.
  • the barrel of the differential piston, coaxial with the casing and of smaller diameter than the upper crown 160 is integral with this crown and extends downwards.
  • the lower part of the barrel of the piston slides in a sealed manner in a cylindrical housing 17 coaxial with the casing.
  • the barrel is closed at the bottom by a lower base 161.
  • the differential piston 16 and the cylindrical housing 17 compartmentalize the interior of the casing according to a so-called "mixing" chamber 14 delimited by the cylindrical housing 17 and the lower base of the differential piston 161, a so-called “upper” chamber 13 delimited by the upper crown 160 and the cover 191 of the casing, and a so-called “lower” chamber 12, of substantially the same shape annular, delimited by the part below the upper crown 160, by the envelope and by the cylindrical housing 17.
  • the hydraulic machine comprises a first tube 10 connecting the lower chamber 12 to the outside, and a second tube 11 connecting the mixing chamber 14 to the outside.
  • a cylindrical sleeve 15 coaxial with the casing extends from the mixing chamber downwards to allow the mixing chamber to be connected to an injection device 2.
  • This injection device is actuated by the hydraulic machine by means of a rod 162 of the piston, itself connected to a means for pumping the additive (not shown in the figures).
  • a rod 162 of the piston itself connected to a means for pumping the additive (not shown in the figures).
  • Hydraulic switching means are provided for supplying and discharging the chambers 12, 13, 14 separated by the piston. These switching means are controlled by the movements of the piston and comprise a connecting rod 180 acting on a distribution member capable of taking two stable positions. More precisely, the distribution member comprises at least one valve holder 181 comprising at least a first so-called “upper” valve 182 cooperating with a seat 163 made in the upper crown of the piston, and at least a second so-called “lower” valve 183 cooperating with a seat 164 made in the lower base of the piston.
  • the hydraulic machine further comprises triggering means comprising a pusher 185 capable of causing, at the end of the piston stroke, by coming to bear against a stop, a sudden change in the position of the switching means under the action of an elastic means 18, for reversing the stroke of the piston.
  • triggering means comprising a pusher 185 capable of causing, at the end of the piston stroke, by coming to bear against a stop, a sudden change in the position of the switching means under the action of an elastic means 18, for reversing the stroke of the piston.
  • a stop (not shown in the figures) is carried out in the vicinity of the cover 191 to allow the piston to change its upward stroke to a downward stroke.
  • a stop 184 is also carried out in the vicinity of the lower part of the casing to allow the piston to change its downward stroke to an upward stroke.
  • the connecting rod 180 is articulated at one end on a fixed point relative to the piston 16, while the other end of the connecting rod can move in a vertical window of the valve holder 181 and come into abutment against one of the two ends of this window, in one of the two stable positions of the distribution member.
  • the elastic means 18 is integral, at each of its ends, with an articulation member received respectively in a housing provided on the connecting rod and on the pusher 185. Each housing is open in a direction substantially opposite to the direction of the force exerted by the elastic means 18 in the wall of the housing considered.
  • This elastic means 18 can advantageously be constituted by a convex spring blade.
  • the inlet of the hydraulic machine for the main liquid is located at the first pipe 10, and the outlet for the mixture is located at the second pipe. tubing 11.
  • the main liquid under pressure generally water
  • the upper valves are closed while the lower valves are open, allowing the liquid to be discharged from the upper chamber 13 towards the mixing chamber 14 and then the mixture to be evacuated towards the outlet via the pipe 11.
  • the latter begins an upward stroke, which tends to reduce the volume of the upper chamber and therefore to expel its contents towards the mixing chamber, since the communication is open.
  • the pusher 185 comes to bear against a stop connected to the cover 191, which causes, under the effect of the spring blade, the tilting of the connecting rod 180 towards the other stable low position, with movement of the valve holder towards the base of the piston.
  • the lower valves close while the upper valves open.
  • the pressurized liquid can pass from the lower chamber 12 to the upper chamber 13, the communication of which with the mixing chamber 14 is now cut off, and the movement of the piston is reversed. This movement is reversed due to the pressure that the main liquid admitted into the upper chamber exerts on the upper face of the upper crown.
  • the pusher 185 At the end of the downward stroke, the pusher 185 at its lower end encounters a stop 184 secured to the casing 190, which causes the connecting rod to tilt again towards the raised position and a movement of the valve holder 181 causing the upper valves to close and the lower valves to open. The movement of the piston 16 is again reversed and the piston starts again following an upward stroke.
  • the hydraulic machine can also be of the type described in the document EP1971776 A1 and on the [ Fig.1 ].
  • This hydraulic machine comprises a casing comprising a body and a cover, a separation means capable of performing an alternating movement in the casing between the body and the cover, this separation means defining two chambers.
  • the hydraulic machine also comprises hydraulic switching means for supplying liquid to and discharging the aforementioned chambers. These switching means comprise a distribution member capable of taking two stable positions and controlled by the movements of the separation means.
  • the body of the casing further contains a compartment connected to a liquid inlet. under pressure and in which the switching means are housed, as well as triggering means comprising a pusher connected to the separation means, capable of causing, at the end of the stroke, a sudden change in the position of the switching means, under the action of an elastic means, for reversing the stroke.
  • the distribution member comprises a distribution drawer applied against a flat plate fixed relative to the body of the casing, the distribution drawer being able to slide in a sealed manner, without a seal, against the plate which comprises orifices connected respectively to the chambers of the casing and to a liquid outlet orifice.
  • the drawer is then designed to, depending on its position, close certain of the orifices or put them in communication with the fluid inlet or with the exhaust.
  • the proportional metering pump comprises a hydraulic machine 1 such as those described above.
  • This machine is therefore provided with an inlet 10 and an outlet 11, the hydraulic machine extending along a longitudinal axis x and containing a member 16 capable of performing an alternating movement, the supply of liquid to the pump at the inlet triggering an alternating translational movement along the longitudinal axis x of the member 16.
  • the proportional metering pump comprises a volumetric type pump 4, provided with an axis 42, an inlet 40 intended to be placed in fluid communication with a reservoir, and an outlet 41 in fluid communication 51 with the outlet 11 of the hydraulic machine.
  • a positive displacement pump is a pump in which a certain quantity of "trapped" fluid is forced to move to the outlet port.
  • the flow rate of a positive displacement pump is proportional to the speed of operation of its moving elements and depends very little on the discharge pressure; on the other hand, the energy consumed by the pump is proportional to the pressure difference between the outlet and the inlet of the pump.
  • the volumetric pump is a peristaltic pump.
  • a peristaltic pump is a pump used to produce a flow of fluids, either liquids or gases.
  • the fluid, liquid or gas is contained in a flexible tube, and is driven by a system pressing the tube inside the pump.
  • the peristaltic pump generally consists of a head, most often circular in shape, inside which is a flexible tube where the fluid to be pumped progresses.
  • This tube is deformed by a rotor equipped with rollers or pebbles, which compress it against the circular head.
  • the rollers which block portions of the pipe during their rotation will move the retained fluid in the same direction.
  • the suction of the fluid at the pump inlet is possible due to the elasticity of the pipe.
  • the proportional metering pump also comprises a motion converter 2 designed to transform the alternating translational motion of the member 16 of the hydraulic machine into a rotational motion.
  • This rotational motion is intended to be transmitted to the rotation axis 42 of the volumetric pump 4, preferably peristaltic, so as to drive said pump.
  • the motion converter 2 comprises a body 22, a rotor 23 itself housed in another body and provided with at least one helical rail and an actuator 21 which extends longitudinally along the longitudinal axis x of the hydraulic machine.
  • the body 22 is fixed relative to the hydraulic machine while the rotor 23 is rotating relative to the hydraulic machine and while the actuator 21 is translating relative to the hydraulic machine.
  • the actuator 21 is connected at one of its ends with the member 16 of the hydraulic machine and cooperates with the helical rail of the rotor 23.
  • a pinion 24 is further provided, rotationally connected to the rotor 23, which constitutes an output of the converter according to a rotational movement, which is therefore initially induced by the translation of the actuator 21.
  • the actuator 21 comprises a shaft 29 connected to the member 16 of the hydraulic machine, a first axis 25 and a second axis 26 each mounted perpendicularly on the shaft 29 of the actuator.
  • first axis 25 is provided to slide at a first end 25a in a first straight rail 27a arranged in the body 22 of the motion converter 2 to prevent the shaft 29 from rotating and to thus guide it only in translation.
  • the second axis 26 is designed to slide at a first end 26a in a first helical rail 28a arranged on the rotor 23, so as to drive the rotor in rotation, without the shaft 29 rotating.
  • the first axis is designed to slide at a first end 25a and at a second end 25b respectively in a first straight rail 27a and in a second straight rail 27b arranged in the body 22 of the motion converter 2.
  • the second axis 26 is provided to slide at a first end 26a and at a second end 26b respectively in a first helical rail. 28a and in a second helical rail 28b arranged on the rotor 23, so as to drive the rotor in rotation without the shaft 29 rotating.
  • the shaft 29 of the actuator 21 may be provided with one or more longitudinal grooves each capable of accommodating a rib provided on the body 22 of the motion converter 2.
  • the shaft 29 is connected to the member 16 of the hydraulic machine by means of a pivot connection 20.
  • the member 16 has a natural tendency to rotate on itself during operation.
  • the pivot connection allows this movement to be left free, and thus prevents unscrewing of the shaft 29 and/or irregular wear of the member 16.
  • the proportional dosing pump includes a variator 3 intended to adjust the speed of rotation from the motion converter 2.
  • the variator 3 comprises an output axis 32 substantially parallel to the axis (x) of the hydraulic machine, a toothed cone 30, the axis of revolution of which is inclined such that one of its longitudinal edges extends parallel to the output axis 32.
  • a roller 33 is mounted on the output shaft 32 so as to be rotationally integral with the output shaft 32.
  • the roller remains in contact with the toothed cone on its longitudinal edge.
  • the output pinion 24 of the converter drives the toothed wheel of the cone 30, while the toothed cone 30 drives the roller 33 in rotation by adhesion.
  • roller 33 drives the output shaft 32, which itself drives the shaft 42 of the volumetric pump.
  • This variator comprises means 34, 340 for adjusting the position of the roller 33 along the output axis 32 of the variator.
  • These means comprise a support 340 for fixing the roller, which support is integral with a stuffing box 34 mounted on the body of the rotor 23 and the tightening/loosening of which on the body of the rotor 23 allows the movement of the roller along the output axis 32.
  • the variator comprises disengaging means 31 making it possible to move the cone 30 away from the roller 33, so that the cone does not drive plus the pebble by adhesion.
  • the toothed wheel of cone 30 remains in contact with the output of the converter (which is preferably pinion 24).
  • the disengaging means 31 consist of a pull rod passing through a support 35 secured to the body 22 of the motion converter 2 and anchored in the toothed cone, and of a spring mounted compressed on said pull rod to press the cone against the roller, a pull on said pull rod further compressing the spring and making it possible to move the cone away from the roller.
  • the proportional dosing pump comprises an injection T 5 which is consequently supplied by the outlet 11 of the hydraulic machine and by the outlet 41 of the peristaltic pump.
  • the injection T is provided with a first non-return valve and a second non-return valve provided respectively downstream of the outlet 11 of the hydraulic machine and downstream of the outlet 41 of the peristaltic pump to prevent the mixture from flowing back towards the hydraulic machine and towards the peristaltic pump respectively.
  • an adjustment of the variator 3 is carried out (for example by adjusting the position of the roller on the output shaft 32), according to the expected dosage, before supplying the inlet of the hydraulic machine with main liquid at a predetermined flow rate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Rotary Pumps (AREA)
  • Feeding And Controlling Fuel (AREA)

Description

La présente invention concerne un procédé et une pompe à dosage proportionnel pour introduire un additif liquide dans un courant de liquide principal, circulant dans une conduite, la pompe étant du type 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.The present invention relates to a method and a proportional dosing pump for introducing a liquid additive into a main liquid stream, circulating in a pipe, the pump being of the differential piston type with reciprocating movement for taking the additive from a container and dosing it, this pump comprising a first inlet for receiving a flow of main liquid which ensures the driving of the pump, a second inlet for taking the additive and an outlet for the mixture of additive and liquid.

Habituellement et tel que décrit dans le document EP 3440353 B1 , 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. Une autre pompe doseuse connue dans l'art antérieur est divulguée par le document FR 2 681 646 Al ; la pompe de ce document ne comprend cependant pas une pompe volumétrique dotée d'un axe de rotation, et un convertisseur de mouvement prévu pour transformer le mouvement alternatif de translation de la machine hydraulique en un mouvement de rotation transmis à l'axe de rotation de la pompe volumétrique.Usually and as described in the document EP 3440353 B1 , the differential piston performs a reciprocating movement and drives a plunger piston to take up the additive to be dosed during an upstroke and to inject this additive into the main liquid or engine liquid during a downstroke. Another dosing pump known in the prior art is disclosed by the document FR 2 681 646 Al; the pump of this document does not however comprise a volumetric pump provided with an axis of rotation, and a motion converter provided for transforming the reciprocating translational motion of the hydraulic machine into a rotational motion transmitted to the axis of rotation of the volumetric pump.

Cependant, lorsque l'objectif est d'obtenir des dosages faibles, c'est-à-dire inférieurs à 300 ppm, voire de l'ordre de quelques dizaines de ppm, la pompe à dosage proportionnel ne peut plus fournir un tel dosage.However, when the objective is to obtain low dosages, i.e. less than 300 ppm, or even of the order of a few tens of ppm, the proportional dosing pump can no longer provide such dosage.

En effet, les dispositifs d'aspiration classique ne permettent pas un dimensionnement qui puisse prélever une quantité d'additif suffisamment faible à chaque cycle.In fact, conventional suction devices do not allow for a dimensioning that can collect a sufficiently small quantity of additive in each cycle.

La pompe à dosage proportionnel fournit alors un dosage très supérieur à ce qui est requis.The proportional dosing pump then provides a dosage much higher than what is required.

C'est pourquoi, l'invention a pour but, surtout, de proposer un procédé et une pompe à dosage proportionnel qui ne présentent plus ou à un degré moindre les inconvénients évoqués précédemment et qui permettent d'optimiser le fonctionnement des pompes à dosage proportionnel, en particulier dans le cas où les dosages ciblés sont faibles.This is why the invention aims, above all, to propose a method and a proportional dosing pump which no longer have, or to a lesser degree, the drawbacks mentioned above and which make it possible to optimize the operation of proportional dosing pumps, in particular in the case where the targeted dosages are low.

L'invention se fonde notamment sur le remplacement des mécanismes de dosage antérieurs par des pompes du type volumétrique, c'est-à-dire des pompes dans lesquelles le transfert du fluide se fait au moyen d'un déplacement de volume à chaque cycle. Le débit d'une pompe volumétrique est alors proportionnel à la vitesse d'actionnement de ses éléments mobiles et dépend très peu de la pression de refoulement.The invention is based in particular on the replacement of previous metering mechanisms by volumetric type pumps, i.e. pumps in which the transfer of the fluid is done by means of a volume displacement at each cycle. The flow rate of a volumetric pump is then proportional to the speed of actuation of its moving elements and depends very little on the discharge pressure.

L'invention se fonde selon un mode de réalisation préféré sur le remplacement des mécanismes de dosage antérieurs par des pompes du type péristaltique, c'est-à-dire des pompes capables d'aspirer et de refouler un liquide lorsqu'elles fonctionnent à faible vitesse, soit à des vitesses inférieures à quelques tours par heure.The invention is based, according to a preferred embodiment, on the replacement of the previous dosing mechanisms by peristaltic type pumps, that is to say pumps capable of sucking and discharging a liquid when they operate at low speed, that is to say at speeds lower than a few revolutions per hour.

L'invention a en particulier pour objet une pompe à dosage proportionnel comprenant une machine hydraulique dotée d'une entrée et d'une sortie, la machine hydraulique s'étendant suivant un axe longitudinal (x) et renfermant un organe propre à effectuer un mouvement alternatif suivant cet axe, l'alimentation de la machine hydraulique en liquide principal en entrée déclenchant un mouvement alternatif en translation de l'organe suivant l'axe longitudinal (x), la pompe à dosage proportionnel comportant:

  • une pompe volumétrique, dotée d'un axe de rotation, d'une entrée destinée à être mise en communication de fluide avec un réservoir d'additif et d'une sortie en communication de fluide avec la sortie de la machine hydraulique,
  • un convertisseur de mouvement prévu pour transformer le mouvement alternatif de translation de l'organe en un mouvement de rotation, ledit mouvement de rotation étant transmis directement ou indirectement à l'axe de rotation de la pompe volumétrique,
    de sorte que l'alimentation de la machine hydraulique actionne la pompe volumétrique qui alimente ainsi en additif la sortie de la machine hydraulique, l'additif se mélangeant au liquide principal en sortie de la machine hydraulique.
The invention relates in particular to a proportional dosing pump comprising a hydraulic machine provided with an inlet and an outlet, the machine hydraulic extending along a longitudinal axis (x) and containing a member capable of performing an alternating movement along this axis, the supply of the hydraulic machine with main liquid at the inlet triggering an alternating translational movement of the member along the longitudinal axis (x), the proportional dosing pump comprising:
  • a volumetric pump, provided with a rotation axis, an inlet intended to be placed in fluid communication with an additive tank and an outlet in fluid communication with the outlet of the hydraulic machine,
  • a motion converter designed to transform the reciprocating translational motion of the member into a rotational motion, said rotational motion being transmitted directly or indirectly to the rotation axis of the volumetric pump,
    so that the supply of the hydraulic machine operates the volumetric pump which thus supplies additive to the outlet of the hydraulic machine, the additive mixing with the main liquid at the outlet of the hydraulic machine.

Des caractéristiques optionnelles de l'invention, complémentaires ou de substitution sont énoncées ci-aprèsOptional, complementary or substitute features of the invention are set out below.

Selon un mode de réalisation préféré, la pompe volumétrique peut être une pompe péristaltique.According to a preferred embodiment, the volumetric pump may be a peristaltic pump.

Selon un autre mode de réalisation préféré, la pompe peut comporter en outre un variateur prévu pour ajuster la vitesse de la rotation issue du convertisseur de mouvement.According to another preferred embodiment, the pump may further comprise a variator provided for adjusting the speed of rotation from the motion converter.

Selon un mode de réalisation qui concerne le convertisseur de mouvement, le convertisseur de mouvement peut comporter un rotor doté d'au moins un rail hélicoïdal et un actionneur qui s'étendent chacun longitudinalement suivant l'axe longitudinal (x), l'actionneur étant lié en l'une de ses extrémités avec l'organe de la machine hydraulique et coopérant avec le rail hélicoïdal du rotor, ainsi qu'une sortie liée en rotation avec le rotor et se présentant préférentiellement sous la forme d'un pignon, la montée puis la descente de l'organe induisant la rotation du rotor selon un même sens.According to an embodiment which concerns the motion converter, the motion converter may comprise a rotor provided with at least one helical rail and an actuator which each extend longitudinally along the longitudinal axis (x), the actuator being connected at one of its ends to the member of the hydraulic machine and cooperating with the helical rail of the rotor, as well as an output connected in rotation to the rotor and preferably in the form of a pinion, the raising and then lowering of the member inducing the rotation of the rotor in the same direction.

Selon une certaine particularité du mode de réalisation précité, l'actionneur peut comprendre un arbre connecté à l'organe de la machine hydraulique, un premier axe monté de manière perpendiculaire sur l'arbre de l'actionneur, le premier axe étant prévu pour coulisser en une première extrémité dans un premier rail rectiligne aménagé dans le corps du convertisseur de mouvement, tandis que le second axe est prévu pour coulisser en une première extrémité dans un premier rail hélicoïdal aménagé sur le rotor.According to a certain particularity of the aforementioned embodiment, the actuator may comprise a shaft connected to the hydraulic machine member, a first axis mounted perpendicularly on the actuator shaft, the first axis being provided to slide at a first end in a first rectilinear rail arranged in the body of the motion converter, while the second axis is provided to slide at a first end in a first helical rail arranged on the rotor.

Selon une autre particularité du mode de réalisation précité, l'actionneur peut comprendre un arbre connecté à l'organe de la machine hydraulique, un premier axe et un second axe montés de manière perpendiculaire sur l'arbre de l'actionneur, le premier axe étant prévu pour coulisser en une première extrémité et en une seconde extrémité respectivement dans un premier rail rectiligne et dans un second rail rectiligne aménagés dans le corps du convertisseur de mouvement, tandis que le second axe est prévu pour coulisser en une première extrémité et en une seconde extrémité respectivement dans un premier rail hélicoïdal et dans un second rail hélicoïdal aménagés sur le rotor.According to another particularity of the aforementioned embodiment, the actuator may comprise a shaft connected to the hydraulic machine member, a first axis and a second axis mounted perpendicularly on the actuator shaft, the first axis being provided to slide at a first end and at a second end respectively in a first straight rail and in a second straight rail arranged in the body of the motion converter, while the second axis is provided to slide at a first end and at a second end respectively in a first helical rail and in a second helical rail arranged on the rotor.

De manière avantageuse, l'arbre peut être connecté à l'organe de la machine hydraulique au moyen d'une liaison pivot.Advantageously, the shaft can be connected to the hydraulic machine member by means of a pivot connection.

Selon un mode de réalisation qui concerne le variateur, le variateur peut comprendre un axe de sortie, un cône denté, dont l'axe de révolution est incliné par rapport à l'axe de sortie, de telle sorte qu'une de ses arêtes de profil s'étende parallèlement à l'axe de sortie, un galet solidaire en rotation de l'axe de sortie et apte à translater le long de l'axe de sortie, le pignon de sortie du convertisseur engrenant la roue dentée du cône, le cône denté entraînant le galet en rotation par adhérence ainsi que l'axe de sortie, lui-même entraînant l'axe de la pompe volumétrique.According to an embodiment which concerns the variator, the variator can comprise an output shaft, a toothed cone, the axis of revolution of which is inclined relative to the output shaft, such that one of its profile edges extends parallel to the output shaft, a roller integral in rotation with the output shaft and capable of translating along the output shaft, the output pinion of the converter meshing with the toothed wheel of the cone, the toothed cone driving the roller in rotation by adhesion as well as the output shaft, itself driving the shaft of the volumetric pump.

Selon une certaine particularité du mode de réalisation précité, le variateur peut comprendre en outre des moyens pour régler la position du galet sur l'axe de sortie du variateur, ces moyens comportant un support de fixation du galet, en outre solidaire d'un presse-étoupe monté sur le corps du rotor et dont le serrage / desserrage sur le corps du rotor permet le déplacement du galet le long de l'axe de sortie du variateur.According to a certain particularity of the aforementioned embodiment, the variator can further comprise means for adjusting the position of the roller on the output axis of the variator, these means comprising a support for fixing the roller, furthermore secured to a stuffing box mounted on the body of the rotor and the tightening/loosening of which on the body of the rotor allows the movement of the roller along the output axis of the variator.

Selon une autre particularité du mode de réalisation précité, le variateur peut comporter des moyens de débrayage permettant d'éloigner la surface du cône du galet, de manière à interdire l'entraînement du galet par adhérence.According to another particularity of the aforementioned embodiment, the variator may include disengaging means making it possible to move the surface of the cone away from the roller, so as to prevent the roller from being driven by adhesion.

De manière avantageuse, les moyens de débrayage peuvent consister en une tirette traversant un support solidaire du corps du convertisseur de mouvement et ancrée dans le cône denté, et en un ressort monté comprimé sur ladite tirette pour plaquer le cône contre le galet, une traction sur ladite tirette comprimant davantage le ressort et permettant d'éloigner le cône du galet.Advantageously, the disengaging means may consist of a pull rod passing through a support secured to the body of the motion converter and anchored in the toothed cone, and of a spring mounted compressed on said pull rod to press the cone against the roller, a pull on said pull rod further compressing the spring and making it possible to move the cone away from the roller.

De manière avantageuse, la pompe à dosage proportionnel peut comporter un T d'injection alimenté par la sortie de la machine hydraulique et par la sortie de pompe volumétrique.Advantageously, the proportional metering pump can include an injection T supplied by the output of the hydraulic machine and by the output of the volumetric pump.

Dans ce cas, de manière préférentielle, le T d'injection peut être doté d'un premier clapet anti-retour et d'un second clapet anti-retour prévus respectivement pour empêcher le reflux vers la machine hydraulique et vers la pompe volumétrique.In this case, preferably, the injection T can be provided with a first non-return valve and a second non-return valve provided respectively to prevent backflow towards the hydraulic machine and towards the volumetric pump.

L'invention a également pour objet un procédé de dosage proportionnel mettant en oeuvre une pompe à dosage proportionnel conforme à l'invention, et dans lequel on procède aux étapes suivantes :

  • On raccorde l'entrée de la pompe volumétrique à un récipient rempli de l'additif à doser,
  • On raccorde l'entrée de la machine hydraulique à une source de liquide principal,
  • On effectue un réglage du variateur prévu pour ajuster la vitesse de la rotation résultant du convertisseur de mouvement, en fonction du dosage attendu,
  • On procède à l'alimentation de l'entrée de la machine hydraulique en liquide principal suivant un débit prédéterminé, de sorte que l'alimentation de la machine hydraulique actionne la pompe volumétrique qui alimente ainsi en additif la sortie de la machine hydraulique, ou bien le T d'injection si la sortie de la pompe est dotée d'un T d'injection, l'additif se mélangeant au liquide principal.
The invention also relates to a proportional dosing method using a proportional dosing pump according to the invention, and in which the following steps are carried out:
  • The inlet of the volumetric pump is connected to a container filled with the additive. dose,
  • The hydraulic machine inlet is connected to a source of main liquid,
  • An adjustment of the variator is carried out to adjust the speed of rotation resulting from the motion converter, depending on the expected dosage,
  • The inlet of the hydraulic machine is supplied with main liquid at a predetermined flow rate, so that the supply of the hydraulic machine actuates the volumetric pump which thus supplies the outlet of the hydraulic machine with additive, or the injection T if the outlet of the pump is equipped with an injection T, the additive mixing with the main liquid.

D'autres avantages et particularités de l'invention apparaîtront à la lecture de la description détaillée de mises en oeuvre et de modes de réalisation nullement limitatifs, et des dessins annexés suivants :

  • [Fig.1] Cette figure représente une vue schématique d'une machine hydraulique utilisable dans l'invention.
  • [Fig.2] Cette figure représente une vue schématique de profil d'une pompe à dosage proportionnel selon l'invention.
  • [Fig.3] Cette figure représente un détail du convertisseur d'une pompe à dosage proportionnel selon un mode de réalisation de l'invention.
  • [Fig.4] Cette figure représente un détail du variateur d'une pompe à dosage proportionnel selon un mode de réalisation de l'invention.
Other advantages and particularities of the invention will appear on reading the detailed description of implementations and embodiments which are in no way limiting, and the following appended drawings:
  • [ Fig.1 ] This figure represents a schematic view of a hydraulic machine usable in the invention.
  • [ Fig.2 ] This figure represents a schematic side view of a proportional dosing pump according to the invention.
  • [ Fig.3 ] This figure represents a detail of the converter of a proportional dosing pump according to one embodiment of the invention.
  • [ Fig.4 ] This figure represents a detail of the variator of a proportional dosing pump according to one embodiment of the invention.

En se reportant à la [Fig.1], on peut voir une machine hydraulique 1 du type de celle qui est utilisée dans la pompe à dosage proportionnel selon l'invention.Referring to the [ Fig.1 ], we can see a hydraulic machine 1 of the type used in the proportional metering pump according to the invention.

La machine hydraulique 1 comprend un piston hydraulique différentiel 16 à mouvement alternatif contenu dans une enveloppe 190 constituée d'un corps cylindrique s'étendant suivant un axe (x) et surmonté d'un couvercle 191 assemblé au corps de manière démontable, notamment par vissage. L'organe appelé aussi piston différentiel 16 est disposé dans l'enveloppe 190 pour coulisser en mouvement alternatif suivant l'axe (x). L'organe 16 comporte, en partie haute, une couronne supérieure 160 de grande section, dont la périphérie est en appui de manière étanche contre la paroi interne de l'enveloppe. Le fût du piston différentiel, coaxial à l'enveloppe et de plus petit diamètre que la couronne supérieure 160 est solidaire de cette couronne et s'étend vers le bas. La partie inférieure du fût du piston coulisse de manière étanche dans un logement cylindrique 17 coaxial à l'enveloppe. Le fût est fermé en partie basse par une base inférieure 161. Le piston différentiel 16 et le logement cylindrique 17 compartimentent l'intérieur de l'enveloppe suivant une chambres dite « de mélange » 14 délimitée par le logement cylindrique 17 et la base inférieure du piston différentiel 161, une chambre dite «supérieure» 13 délimitée par la couronne supérieure 160 et le couvercle 191 de l'enveloppe, et une chambre dite «inférieure» 12, de forme sensiblement annulaire, délimitée par la partie en deçà de la couronne supérieure 160, par l'enveloppe et par le logement cylindrique 17.The hydraulic machine 1 comprises a differential hydraulic piston 16 with reciprocating motion contained in a casing 190 consisting of a cylindrical body extending along an axis (x) and topped with a cover 191 assembled to the body in a removable manner, in particular by screwing. The member also called differential piston 16 is arranged in the casing 190 to slide in reciprocating motion along the axis (x). The member 16 comprises, in the upper part, an upper crown 160 of large section, the periphery of which bears in a sealed manner against the internal wall of the casing. The barrel of the differential piston, coaxial with the casing and of smaller diameter than the upper crown 160 is integral with this crown and extends downwards. The lower part of the barrel of the piston slides in a sealed manner in a cylindrical housing 17 coaxial with the casing. The barrel is closed at the bottom by a lower base 161. The differential piston 16 and the cylindrical housing 17 compartmentalize the interior of the casing according to a so-called "mixing" chamber 14 delimited by the cylindrical housing 17 and the lower base of the differential piston 161, a so-called "upper" chamber 13 delimited by the upper crown 160 and the cover 191 of the casing, and a so-called "lower" chamber 12, of substantially the same shape annular, delimited by the part below the upper crown 160, by the envelope and by the cylindrical housing 17.

La machine hydraulique comprend une première tubulure 10 reliant la chambre inférieure 12 à l'extérieur, et une seconde tubulure 11 reliant la chambre de mélange 14 à l'extérieur. Un manchon cylindrique 15 coaxial à l'enveloppe s'étend depuis la chambre de mélange vers le bas pour permettre le raccordement de la chambre de mélange à un dispositif d'injection 2. Ce dispositif d'injection est actionné par la machine hydraulique au moyen d'une tige 162 du piston, elle-même reliée à un moyen de pompage de l'additif (non représenté sur les figures). Pour plus de détails concernant ce type de dispositif, on pourra se reporter aux documents EP0255791 et EP1151196 .The hydraulic machine comprises a first tube 10 connecting the lower chamber 12 to the outside, and a second tube 11 connecting the mixing chamber 14 to the outside. A cylindrical sleeve 15 coaxial with the casing extends from the mixing chamber downwards to allow the mixing chamber to be connected to an injection device 2. This injection device is actuated by the hydraulic machine by means of a rod 162 of the piston, itself connected to a means for pumping the additive (not shown in the figures). For more details concerning this type of device, reference may be made to the documents EP0255791 And EP1151196 .

Des moyens de commutation hydraulique sont prévus pour l'alimentation et l'évacuation des chambres 12, 13, 14 séparées par le piston. Ces moyens de commutation sont commandés par les déplacements du piston et comportent une bielle 180 agissant sur un organe de distribution pouvant prendre deux positions stables. Plus précisément, l'organe de distribution comprend au moins un porte-clapets 181 comprenant au moins un premier clapet dit « supérieur » 182 coopérant avec un siège 163 pratiqué dans la couronne supérieure du piston, et au moins un second clapet dit « inférieur » 183 coopérant avec un siège 164 pratiqué dans la base inférieure du piston.Hydraulic switching means are provided for supplying and discharging the chambers 12, 13, 14 separated by the piston. These switching means are controlled by the movements of the piston and comprise a connecting rod 180 acting on a distribution member capable of taking two stable positions. More precisely, the distribution member comprises at least one valve holder 181 comprising at least a first so-called "upper" valve 182 cooperating with a seat 163 made in the upper crown of the piston, and at least a second so-called "lower" valve 183 cooperating with a seat 164 made in the lower base of the piston.

La machine hydraulique comporte en outre des moyens de déclenchement comprenant un poussoir 185 propres à provoquer, en fin de course du piston, par venue en appui contre une butée, un changement brusque de la position des moyens de commutation sous l'action d'un moyen élastique 18, pour l'inversion de la course du piston. La venue en appui contre une butée (non représentée sur les figures) s'effectue au voisinage du couvercle 191 pour permettre au piston de changer sa course ascendante en course descendante. La venue en appui contre une butée 184 s'effectue également au voisinage de la partie inférieure de l'enveloppe pour permettre au piston de changer sa course descendante en course ascendante.The hydraulic machine further comprises triggering means comprising a pusher 185 capable of causing, at the end of the piston stroke, by coming to bear against a stop, a sudden change in the position of the switching means under the action of an elastic means 18, for reversing the stroke of the piston. Coming to bear against a stop (not shown in the figures) is carried out in the vicinity of the cover 191 to allow the piston to change its upward stroke to a downward stroke. Coming to bear against a stop 184 is also carried out in the vicinity of the lower part of the casing to allow the piston to change its downward stroke to an upward stroke.

La bielle 180 est articulée à une extrémité sur un point fixe par rapport au piston 16, tandis que l'autre extrémité de la bielle peut se déplacer dans une fenêtre verticale du porte-clapets 181 et venir en butée contre l'une des deux extrémités de cette fenêtre, dans l'une des deux positions stables de l'organe de distribution. Le moyen élastique 18 est solidaire, à chacune de ses extrémités, d'un organe d'articulation reçu respectivement dans un logement prévu sur la bielle et sur le poussoir 185. Chaque logement est ouvert suivant une direction sensiblement opposée au sens de l'effort exercé par le moyen élastique 18 dans la paroi du logement considéré. Ce moyen élastique 18 peut être avantageusement constitué par une lame ressort convexe.The connecting rod 180 is articulated at one end on a fixed point relative to the piston 16, while the other end of the connecting rod can move in a vertical window of the valve holder 181 and come into abutment against one of the two ends of this window, in one of the two stable positions of the distribution member. The elastic means 18 is integral, at each of its ends, with an articulation member received respectively in a housing provided on the connecting rod and on the pusher 185. Each housing is open in a direction substantially opposite to the direction of the force exerted by the elastic means 18 in the wall of the housing considered. This elastic means 18 can advantageously be constituted by a convex spring blade.

L'entrée de la machine hydraulique pour le liquide principal se situe au niveau de la première tubulure 10, et la sortie pour le mélange se situe au niveau de la seconde tubulure 11.The inlet of the hydraulic machine for the main liquid is located at the first pipe 10, and the outlet for the mixture is located at the second pipe. tubing 11.

Suivant le cycle associé à cette configuration, le liquide principal sous pression, généralement de l'eau, entre dans la chambre inférieure 12 par la tubulure 10. Les clapets supérieurs sont fermés alors que les clapets inférieurs sont ouverts, permettant le refoulement du liquide de la chambre supérieure 13 vers la chambre de mélange 14 puis l'évacuation du mélange vers la sortie via la tubulure 11. En effet, sous l'action de la pression du liquide principal sur la face inférieure de la couronne supérieure du piston, ce dernier entame une course ascendante, qui tend à diminuer le volume de la chambre supérieure et donc à en chasser le contenu vers la chambre de mélange, puisque la communication est ouverte.According to the cycle associated with this configuration, the main liquid under pressure, generally water, enters the lower chamber 12 via the pipe 10. The upper valves are closed while the lower valves are open, allowing the liquid to be discharged from the upper chamber 13 towards the mixing chamber 14 and then the mixture to be evacuated towards the outlet via the pipe 11. Indeed, under the action of the pressure of the main liquid on the lower face of the upper crown of the piston, the latter begins an upward stroke, which tends to reduce the volume of the upper chamber and therefore to expel its contents towards the mixing chamber, since the communication is open.

En fin de course ascendante, le poussoir 185 vient en appui contre une butée liée au couvercle 191, ce qui provoque sous l'effet de la lame ressort le basculement de la bielle 180 vers l'autre position stable basse, avec déplacement du porte-clapets vers la base du piston. Les clapets inférieurs se ferment tandis que les clapets supérieurs s'ouvrent. Le liquide sous pression peut passer depuis la chambre inférieure 12 vers la chambre supérieure 13, dont la communication avec la chambre de mélange 14 est maintenant coupée, et le mouvement du piston est inversé. Ce mouvement est inversé du fait de la pression que le liquide principal admis dans la chambre supérieure exerce sur la face supérieure de la couronne supérieure. En fin de course descendante, le poussoir 185 par son extrémité inférieure rencontre une butée 184 solidaire de l'enveloppe 190, ce qui provoque un nouveau basculement de la bielle vers la position relevée et un déplacement du porte-clapets 181 entraînant la fermeture des clapets supérieurs et l'ouverture des clapets inférieurs. Le mouvement du piston 16 est de nouveau inversé et le piston repart suivant une course ascendante.At the end of the upward stroke, the pusher 185 comes to bear against a stop connected to the cover 191, which causes, under the effect of the spring blade, the tilting of the connecting rod 180 towards the other stable low position, with movement of the valve holder towards the base of the piston. The lower valves close while the upper valves open. The pressurized liquid can pass from the lower chamber 12 to the upper chamber 13, the communication of which with the mixing chamber 14 is now cut off, and the movement of the piston is reversed. This movement is reversed due to the pressure that the main liquid admitted into the upper chamber exerts on the upper face of the upper crown. At the end of the downward stroke, the pusher 185 at its lower end encounters a stop 184 secured to the casing 190, which causes the connecting rod to tilt again towards the raised position and a movement of the valve holder 181 causing the upper valves to close and the lower valves to open. The movement of the piston 16 is again reversed and the piston starts again following an upward stroke.

Parallèlement, le mouvement alternatif du piston lors de l'alimentation de la machine hydraulique en liquide, permet de générer alternativement une aspiration jusqu'à la sortie 11, cette dernière étant raccordée à un dispositif d'injection 2, appelé aussi mécanisme de dosage 2.At the same time, the alternating movement of the piston when supplying the hydraulic machine with liquid makes it possible to alternately generate suction up to the outlet 11, the latter being connected to an injection device 2, also called a dosing mechanism 2.

La machine hydraulique peut aussi être du type de celui décrit dans le document EP1971776 A1 et sur la [Fig.1].The hydraulic machine can also be of the type described in the document EP1971776 A1 and on the [ Fig.1 ].

Cette machine hydraulique comprend une enveloppe comportant un corps et un couvercle, un moyen de séparation propre à effectuer un mouvement alternatif dans l'enveloppe entre le corps et le couvercle, ce moyen de séparation définissant deux chambres. La machine hydraulique comprend aussi des moyens de commutation hydraulique pour l'alimentation en liquide et l'évacuation des chambres précitées. Ces moyens de commutation comprennent un organe de distribution pouvant prendre deux positions stables et commandé par les déplacements du moyen de séparation. Le corps de l'enveloppe renferme par ailleurs un compartiment relié à une arrivée de liquide sous pression et dans lequel sont logés les moyens de commutation, ainsi que des moyens de déclenchement comprenant un poussoir lié au moyen de séparation, propres à provoquer, en fin de course, un changement brusque de la position des moyens de commutation, sous l'action d'un moyen élastique, pour l'inversion de la course. L'organe de distribution comprend un tiroir de distribution appliqué contre une plaque plane fixe relativement au corps de l'enveloppe, le tiroir de distribution pouvant coulisser de manière étanche, sans joint, contre la plaque qui comporte des orifices reliés respectivement aux chambres de l'enveloppe et à un orifice de sortie du liquide. Le tiroir est alors prévu pour, selon sa position, fermer certains des orifices ou les mettre en communication avec l'arrivée de fluide ou avec l'échappement.This hydraulic machine comprises a casing comprising a body and a cover, a separation means capable of performing an alternating movement in the casing between the body and the cover, this separation means defining two chambers. The hydraulic machine also comprises hydraulic switching means for supplying liquid to and discharging the aforementioned chambers. These switching means comprise a distribution member capable of taking two stable positions and controlled by the movements of the separation means. The body of the casing further contains a compartment connected to a liquid inlet. under pressure and in which the switching means are housed, as well as triggering means comprising a pusher connected to the separation means, capable of causing, at the end of the stroke, a sudden change in the position of the switching means, under the action of an elastic means, for reversing the stroke. The distribution member comprises a distribution drawer applied against a flat plate fixed relative to the body of the casing, the distribution drawer being able to slide in a sealed manner, without a seal, against the plate which comprises orifices connected respectively to the chambers of the casing and to a liquid outlet orifice. The drawer is then designed to, depending on its position, close certain of the orifices or put them in communication with the fluid inlet or with the exhaust.

Tel que décrit dans la [Fig.2], la pompe à dosage proportionnel selon l'invention comprend une machine hydraulique 1 telle que celles décrites précédemment. Cette machine est donc dotée d'une entrée 10 et d'une sortie 11, la machine hydraulique s'étendant suivant un axe longitudinal x et renfermant un organe 16 propre à effectuer un mouvement alternatif, l'alimentation de la pompe en liquide en entrée déclenchant un mouvement alternatif de translation suivant l'axe longitudinal x de l'organe 16.As described in the [ Fig.2 ], the proportional metering pump according to the invention comprises a hydraulic machine 1 such as those described above. This machine is therefore provided with an inlet 10 and an outlet 11, the hydraulic machine extending along a longitudinal axis x and containing a member 16 capable of performing an alternating movement, the supply of liquid to the pump at the inlet triggering an alternating translational movement along the longitudinal axis x of the member 16.

La pompe à dosage proportionnel comporte une pompe du type volumétrique 4, dotée d'un axe 42, d'une entrée 40 destinée à être mise en communication de fluide avec un réservoir, et d'une sortie 41 en communication de fluide 51 avec la sortie 11 de la machine hydraulique.The proportional metering pump comprises a volumetric type pump 4, provided with an axis 42, an inlet 40 intended to be placed in fluid communication with a reservoir, and an outlet 41 in fluid communication 51 with the outlet 11 of the hydraulic machine.

On entend par pompe volumétrique une pompe dans laquelle une certaine quantité de fluide « emprisonnée » est forcée à se déplacer jusqu'à l'orifice de sortie.A positive displacement pump is a pump in which a certain quantity of "trapped" fluid is forced to move to the outlet port.

Le débit d'une pompe volumétrique est proportionnel à la vitesse d'actionnement de ses éléments mobiles et dépend très peu de la pression de refoulement, par contre, l'énergie consommée par la pompe est proportionnelle à la différence de pression entre la sortie et l'entrée de la pompe.The flow rate of a positive displacement pump is proportional to the speed of operation of its moving elements and depends very little on the discharge pressure; on the other hand, the energy consumed by the pump is proportional to the pressure difference between the outlet and the inlet of the pump.

Avantageusement, la pompe volumétrique est une pompe péristaltique.Advantageously, the volumetric pump is a peristaltic pump.

On entend par pompe péristaltique une pompe utilisée pour produire un débit de fluides, soit de liquides ou de gaz. Le fluide, liquide ou gazeux, est contenu dans un tube flexible, et est entraîné par un système pressant le tube à l'intérieur de la pompe. La pompe péristaltique est généralement constituée d'une tête, le plus souvent de forme circulaire, à l'intérieur de laquelle se trouve un tube flexible où progresse le fluide à pomper.A peristaltic pump is a pump used to produce a flow of fluids, either liquids or gases. The fluid, liquid or gas, is contained in a flexible tube, and is driven by a system pressing the tube inside the pump. The peristaltic pump generally consists of a head, most often circular in shape, inside which is a flexible tube where the fluid to be pumped progresses.

Ce tube est déformé par un rotor doté de rouleaux ou galets, qui le compriment contre la tête circulaire. Les galets qui obturent des portions du tuyau durant leur rotation vont déplacer le fluide retenu dans le même sens. L'aspiration du fluide à l'entrée de la pompe est possible du fait de l'élasticité du tuyau.This tube is deformed by a rotor equipped with rollers or pebbles, which compress it against the circular head. The rollers which block portions of the pipe during their rotation will move the retained fluid in the same direction. The suction of the fluid at the pump inlet is possible due to the elasticity of the pipe.

A aucun moment le fluide n'est en contact avec le rotor. Il est uniquement en contact avec l'intérieur du tube, ce qui évite tout risque de contamination avec le mouvement de la pompe, voire de corrosion ou d'abrasion de celui-ci par les fluides agressifs ou chargés. L'évacuation du fluide est soumise à pulsations du fait du passage des galets.At no time is the fluid in contact with the rotor. It is only in contact with the inside of the tube, which avoids any risk of contamination with the movement of the pump, or even corrosion or abrasion of the latter by aggressive or charged fluids. The evacuation of the fluid is subject to pulsations due to the passage of the rollers.

Bien entendu, tout autre pompe pouvant fonctionner à de faible vitesse (c'est-à-dire à des vitesses inférieures à quelques tours par heure) pourrait également être utilisées.Of course, any other pump that can operate at low speeds (i.e. speeds less than a few revolutions per hour) could also be used.

La pompe à dosage proportionnel comporte également un convertisseur de mouvement 2 prévu pour transformer le mouvement alternatif de translation de l'organe 16 de la machine hydraulique en un mouvement de rotation. Ce mouvement de rotation est destiné à être transmis à l'axe de rotation 42 de la pompe volumétrique 4, préférentiellement péristaltique, de manière à entraîner ladite pompe.The proportional metering pump also comprises a motion converter 2 designed to transform the alternating translational motion of the member 16 of the hydraulic machine into a rotational motion. This rotational motion is intended to be transmitted to the rotation axis 42 of the volumetric pump 4, preferably peristaltic, so as to drive said pump.

Concernant maintenant le convertisseur de mouvement et selon un mode de réalisation particulier représenté en [Fig.3], le convertisseur de mouvement 2 comporte un corps 22, un rotor 23 lui-même logé dans un autre corps et doté d'au moins un rail hélicoïdal et un actionneur 21 qui s'étend longitudinalement suivant l'axe longitudinal x de la machine hydraulique. Le corps 22 est fixe par rapport à la machine hydraulique tandis que le rotor 23 est en rotation par rapport à la machine hydraulique et tandis que l'actionneur 21 est en translation par rapport à la machine hydraulique.Now concerning the motion converter and according to a particular embodiment shown in [ Fig.3 ], the motion converter 2 comprises a body 22, a rotor 23 itself housed in another body and provided with at least one helical rail and an actuator 21 which extends longitudinally along the longitudinal axis x of the hydraulic machine. The body 22 is fixed relative to the hydraulic machine while the rotor 23 is rotating relative to the hydraulic machine and while the actuator 21 is translating relative to the hydraulic machine.

L'actionneur 21 est lié en l'une de ses extrémités avec l'organe 16 de la machine hydraulique et coopère avec le rail hélicoïdal du rotor 23.The actuator 21 is connected at one of its ends with the member 16 of the hydraulic machine and cooperates with the helical rail of the rotor 23.

Avantageusement, il est en outre prévu un pignon 24 lié en rotation avec le rotor 23, qui constitue une sortie du convertisseur selon un mouvement de rotation, qui est donc initialement induit par la translation de l' actionneur 21.Advantageously, a pinion 24 is further provided, rotationally connected to the rotor 23, which constitutes an output of the converter according to a rotational movement, which is therefore initially induced by the translation of the actuator 21.

Selon un premier mode de réalisation, l'actionneur 21 comprend un arbre 29 connecté à l'organe 16 de la machine hydraulique, un premier axe 25 et un second axe 26 montés chacun de manière perpendiculaires sur l'arbre 29 de l'actionneur.According to a first embodiment, the actuator 21 comprises a shaft 29 connected to the member 16 of the hydraulic machine, a first axis 25 and a second axis 26 each mounted perpendicularly on the shaft 29 of the actuator.

De plus, le premier axe 25 est prévu pour coulisser en une première extrémité 25a dans un premier rail rectiligne 27a aménagé dans le corps 22 du convertisseur de mouvement 2 pour empêcher l'arbre 29 de tourner et pour le guider ainsi uniquement en translation.In addition, the first axis 25 is provided to slide at a first end 25a in a first straight rail 27a arranged in the body 22 of the motion converter 2 to prevent the shaft 29 from rotating and to thus guide it only in translation.

Le second axe 26 est quant à lui prévu pour coulisser en une première extrémité 26a dans un premier rail hélicoïdal 28a aménagé sur le rotor 23, de façon à entraîner le rotor en rotation, sans que l'arbre 29 ne tourne.The second axis 26 is designed to slide at a first end 26a in a first helical rail 28a arranged on the rotor 23, so as to drive the rotor in rotation, without the shaft 29 rotating.

Selon un second mode de réalisation qui présente cette fois un double guidage, le premier axe est prévu pour coulisser en une première extrémité 25a et en une seconde extrémité 25b respectivement dans un premier rail rectiligne 27a et dans un second rail rectiligne 27b aménagés dans le corps 22 du convertisseur de mouvement 2.According to a second embodiment which this time has a double guide, the first axis is designed to slide at a first end 25a and at a second end 25b respectively in a first straight rail 27a and in a second straight rail 27b arranged in the body 22 of the motion converter 2.

De même, le second axe 26 est quant à lui prévu pour coulisser en une première extrémité 26a et en une seconde extrémité 26b respectivement dans un premier rail hélicoïdal 28a et dans un second rail hélicoïdal 28b aménagés sur le rotor 23, de façon à entraîner le rotor en rotation sans que l'arbre 29 ne tourne.Likewise, the second axis 26 is provided to slide at a first end 26a and at a second end 26b respectively in a first helical rail. 28a and in a second helical rail 28b arranged on the rotor 23, so as to drive the rotor in rotation without the shaft 29 rotating.

En doublant les rails, le guidage en translation et le blocage en rotation de l'arbre 29 sont ainsi améliorés.By doubling the rails, the translational guidance and rotational blocking of the shaft 29 are thus improved.

De plus, la montée puis la descente de l'organe 16 induit la rotation du rotor 23 dans le même sens.Furthermore, the raising and lowering of the member 16 induces the rotation of the rotor 23 in the same direction.

Selon une variante, l'arbre 29 de l'actionneur 21 peut être pourvu d'une ou plusieurs rainures longitudinales aptes à accueillir chacune une nervure ménagée sur le corps 22 du convertisseur de mouvement 2.According to a variant, the shaft 29 of the actuator 21 may be provided with one or more longitudinal grooves each capable of accommodating a rib provided on the body 22 of the motion converter 2.

De cette manière, la coopération des rainures de l'arbre 29 avec les nervures correspondantes du corps 22 du convertisseur de mouvement 2, permettent d'empêcher l'arbre 29 de tourner et permettent de le guider ainsi uniquement en translation.In this way, the cooperation of the grooves of the shaft 29 with the corresponding ribs of the body 22 of the motion converter 2, make it possible to prevent the shaft 29 from rotating and thus make it possible to guide it only in translation.

De manière préférentielle, l'arbre 29 est connecté à l'organe 16 de la machine hydraulique au moyen d'une liaison pivot 20. En effet, l'organe 16 a une tendance naturelle à tourner sur lui-même en fonctionnement. La liaison pivot permet de laisser ce mouvement libre, et ainsi d'éviter un dévissage de l'arbre 29 et/ou une usure irrégulière de l'organe 16.Preferably, the shaft 29 is connected to the member 16 of the hydraulic machine by means of a pivot connection 20. Indeed, the member 16 has a natural tendency to rotate on itself during operation. The pivot connection allows this movement to be left free, and thus prevents unscrewing of the shaft 29 and/or irregular wear of the member 16.

Selon un mode préférentiel, la pompe à dosage proportionnel comporte un variateur 3 prévu pour ajuster la vitesse de la rotation issue du convertisseur de mouvement 2.According to a preferred mode, the proportional dosing pump includes a variator 3 intended to adjust the speed of rotation from the motion converter 2.

Selon un mode de réalisation particulier représenté en [Fig.4], le variateur 3 comprend un axe de sortie 32 sensiblement parallèle à l'axe (x) de la machine hydraulique, un cône denté 30, dont l'axe de révolution est incliné de telle sorte qu'une de ses arêtes longitudinales s'étende parallèlement à l'axe de sortie 32.According to a particular embodiment shown in [ Fig.4 ], the variator 3 comprises an output axis 32 substantially parallel to the axis (x) of the hydraulic machine, a toothed cone 30, the axis of revolution of which is inclined such that one of its longitudinal edges extends parallel to the output axis 32.

Un galet 33 est monté sur l'axe de sortie 32 de manière à être solidaire en rotation de l'axe de sortie 32. Le galet reste en contact avec le cône denté sur son arête longitudinale.A roller 33 is mounted on the output shaft 32 so as to be rotationally integral with the output shaft 32. The roller remains in contact with the toothed cone on its longitudinal edge.

Le pignon 24 de sortie du convertisseur entraîne la roue dentée du cône 30, tandis que le cône denté 30 entraîne le galet 33 en rotation par adhérence.The output pinion 24 of the converter drives the toothed wheel of the cone 30, while the toothed cone 30 drives the roller 33 in rotation by adhesion.

Ainsi, le galet 33 entraîne l'axe de sortie 32, qui lui-même entraîne l'axe 42 de la pompe volumétrique.Thus, the roller 33 drives the output shaft 32, which itself drives the shaft 42 of the volumetric pump.

Ce variateur comprend des moyens 34, 340 pour régler la position du galet 33 le long de l'axe de sortie 32 du variateur.This variator comprises means 34, 340 for adjusting the position of the roller 33 along the output axis 32 of the variator.

Ces moyens comportent un support 340 de fixation du galet, lequel support est solidaire d'un presse-étoupe 34 monté sur le corps du rotor 23 et dont le serrage / desserrage sur le corps du rotor 23 permet le déplacement du galet le long de l'axe de sortie 32.These means comprise a support 340 for fixing the roller, which support is integral with a stuffing box 34 mounted on the body of the rotor 23 and the tightening/loosening of which on the body of the rotor 23 allows the movement of the roller along the output axis 32.

De manière avantageuse, le variateur comporte des moyens de débrayage 31 permettant d'éloigner le cône 30 du galet 33, de manière à ce que le cône n'entraîne plus le galet par adhérence.Advantageously, the variator comprises disengaging means 31 making it possible to move the cone 30 away from the roller 33, so that the cone does not drive plus the pebble by adhesion.

La roue dentée du cône 30 reste en revanche en contact avec la sortie du convertisseur (qui est préférentiellement le pignon 24).The toothed wheel of cone 30 remains in contact with the output of the converter (which is preferably pinion 24).

Selon un mode de réalisation préférentiel, les moyens de débrayage 31 consistent en une tirette traversant un support 35 solidaire du corps 22 du convertisseur de mouvement 2 et ancrée dans le cône denté, et en un ressort monté comprimé sur ladite tirette pour plaquer le cône contre le galet, une traction sur ladite tirette comprimant davantage le ressort et permettant d'éloigner le cône du galet.According to a preferred embodiment, the disengaging means 31 consist of a pull rod passing through a support 35 secured to the body 22 of the motion converter 2 and anchored in the toothed cone, and of a spring mounted compressed on said pull rod to press the cone against the roller, a pull on said pull rod further compressing the spring and making it possible to move the cone away from the roller.

Lorsque l'effort de traction sur la tirette cesse, le ressort revient à sa position d'origine et plaque de nouveau le cône contre le galet.When the pulling force on the pull rod ceases, the spring returns to its original position and presses the cone against the roller again.

De façon à optimiser le mélange entre le liquide principal (généralement de l'eau qui arrive à la sortie 11 de la machine hydraulique, et l'additif qui arrive depuis la pompe volumétrique, préférentiellement péristaltique, la pompe à dosage proportionnel comporte un T d'injection 5 qui est par conséquent alimenté par la sortie 11 de la machine hydraulique et par la sortie 41 de pompe péristaltique.In order to optimize the mixing between the main liquid (generally water which arrives at the outlet 11 of the hydraulic machine, and the additive which arrives from the volumetric pump, preferably peristaltic, the proportional dosing pump comprises an injection T 5 which is consequently supplied by the outlet 11 of the hydraulic machine and by the outlet 41 of the peristaltic pump.

Avantageusement, le T d'injection est doté d'un premier clapet anti-retour et d'un second clapet anti-retour prévus respectivement en aval de la sortie 11 de la machine hydraulique et en aval de la sortie 41 de la pompe péristaltique pour empêcher le reflux du mélange respectivement vers la machine hydraulique et vers la pompe péristaltique.Advantageously, the injection T is provided with a first non-return valve and a second non-return valve provided respectively downstream of the outlet 11 of the hydraulic machine and downstream of the outlet 41 of the peristaltic pump to prevent the mixture from flowing back towards the hydraulic machine and towards the peristaltic pump respectively.

Pour ce qui est du procédé de dosage proportionnel, on procède aux étapes suivantes

  • On raccorde l'entrée 40 de la pompe volumétrique 4, préférentiellement péristaltique, à un récipient rempli de l'additif à doser,
  • On raccorde l'entrée 10 de la machine hydraulique 1 à une source de liquide principal,
  • On procède à l'alimentation de l'entrée de la machine hydraulique en liquide principal selon un débit prédéterminé.
As for the proportional dosing process, the following steps are carried out:
  • The inlet 40 of the volumetric pump 4, preferably peristaltic, is connected to a container filled with the additive to be dosed,
  • The inlet 10 of the hydraulic machine 1 is connected to a source of main liquid,
  • The hydraulic machine inlet is supplied with main liquid at a predetermined flow rate.

Lorsque la pompe à dosage proportionnel est dotée d'un variateur 3, on effectue un réglage du variateur 3 (par exemple en ajustant la position du galet sur l'axe de sortie 32), en fonction du dosage attendu, avant de procéder à l'alimentation de l'entrée de la machine hydraulique en liquide principal selon un débit prédéterminé.When the proportional metering pump is equipped with a variator 3, an adjustment of the variator 3 is carried out (for example by adjusting the position of the roller on the output shaft 32), according to the expected dosage, before supplying the inlet of the hydraulic machine with main liquid at a predetermined flow rate.

Claims (14)

  1. A proportional metering pump comprising a hydraulic machine (1) equipped with an inlet (10) and an outlet (11), the hydraulic machine extending along a longitudinal axis (x) and enclosing a member (16) capable of performing a reciprocating movement along this axis, the supply of main liquid to the inlet of the hydraulic machine triggering a reciprocating translational movement of the member (16) along the longitudinal axis (x), the proportional metering pump comprising:
    - a displacement pump (4), equipped with an axis of rotation (42), an inlet (40) intended to be placed in fluid communication with an additive reservoir and an outlet (41) in fluid communication (51) with the outlet (11) of the hydraulic machine,
    - a movement converter (2) designed to transform the reciprocating translational movement of the hydraulic machine member (16) into a rotational movement, said rotational movement being transmitted directly or indirectly to the axis of rotation of the displacement pump (4),
    such that the supply to the hydraulic machine actuates the displacement pump which thus supplies additive to the outlet (11) of the hydraulic machine, the additive mixing with the main liquid at the outlet of the hydraulic machine.
  2. The proportional metering pump according to claim 1, wherein the displacement pump (4) is a peristaltic pump.
  3. The proportional metering pump according to claim 1 or 2, the proportional metering pump further comprising a variable speed drive (3) designed to adjust the speed of rotation derived from the movement converter (2).
  4. The proportional metering pump according to any one of the preceding claims, wherein the movement converter (2) comprises a rotor (23) equipped with at least one helical rail (28a, 28b) and an actuator (21) which each extend longitudinally along the longitudinal axis (x) of the hydraulic machine, the actuator being connected at one of its ends to the hydraulic machine member (16) and cooperating with the helical rail of the rotor (23), as well as an outlet rotationally connected to the rotor (23) and being preferably in the form of a pinion (24), the raising and then lowering of the hydraulic machine member (16) inducing rotation of the rotor (23) in the same direction.
  5. The proportional metering pump according to the preceding claim, wherein the actuator (21) comprises a shaft (29) connected to the hydraulic machine member (16), a first axis (25) and a second axis (26) mounted perpendicularly on the actuator shaft (29), the first axis being designed to slide at a first end (25a, 25b) in a first rectilinear rail (27a, 27b) arranged in the body (22) of the movement converter (2), while the second axis is designed to slide at a first end (26a, 26b) in the helical rail (28a, 28b) arranged on the rotor (23).
  6. The proportional metering pump according to claim 4, wherein the actuator (21) comprises a shaft (29) connected to the member (16), a first axis (25) and a second axis (26) mounted perpendicularly on the actuator shaft (29), the first axis being designed to slide at a first end and at a second end (25a, 25b) respectively in a first rectilinear rail and in a second rectilinear rail (27a, 27b) arranged in the body (22) of the movement converter (2), while the second axis is designed to slide at a first end and at a second end (26a, 26b) respectively in a first helical rail and in a second helical rail (28a, 28b) arranged on the rotor (23).
  7. The proportional metering pump according to one of claims 5 or 6, wherein the shaft (29) is connected to the hydraulic machine member (16) by means of a pivot link (20).
  8. The proportional metering pump according to any one of claims 3 to 7, wherein the variable speed drive (3) comprises an output axis (32), a toothed cone (30), the axis of revolution of which is inclined relative to the output axis (32), such that one of its profile ridges extends in parallel to the output axis (32), a roller (33) rotationally integral with the output axis (32) and capable of traversing along the output axis (32), the converter output pinion (24) meshing with the toothed wheel of the cone (30), the toothed cone (30) rotationally driving, by adhesion, the roller (33) as well as the output axis (32), itself driving the displacement pump axis (42).
  9. The proportional metering pump according to the preceding claim, wherein the variable speed drive (3) comprises means (34, 340) for adjusting the position of the roller (33) on the output axis (32) of the variable speed drive, these means including a roller fastening support (340), furthermore integral with a stuffing box (34) mounted on the body of the rotor and the tightening/loosening of which on the body of the rotor (23) makes it possible to move the roller along the output axis (32) of the variable speed drive.
  10. The proportional metering pump according to claim 8 or 9, wherein the variable speed drive includes decouplers (31) making it possible to move the surface of the cone (30) away from the roller (33), so as to prevent driving of the roller by adhesion.
  11. The proportional metering pump according the preceding claim, wherein the decouplers (31) consist in a pull rod passing through a support (35) integral with the body (22) of the movement converter (2) and anchored in the toothed cone, and in a compressed spring mounted on said pull rod to press the cone against the roller, traction on said pull rod further compressing the spring and making it possible to move the cone away from the roller.
  12. The proportional metering pump according to any one of the preceding claims, the proportional metering pump comprising an injection T (5) supplied by the hydraulic machine outlet (11) and by the displacement pump outlet (41).
  13. The proportional metering pump according to the preceding claim, wherein the injection T is provided with a first non-return valve and a second non-return valve designed respectively to prevent backflow towards the hydraulic machine and towards the displacement pump.
  14. A proportional metering method employing a proportional metering pump in accordance with any of claims 3 to 13, the method comprising the following steps:
    - connecting the inlet (40) of the displacement pump (4) to a container filled with the additive to be metered,
    - connecting the inlet (10) of the hydraulic machine (1) to a source of main liquid,
    - performing setting of the variable speed drive (3) designed so as to adjust the rotation speed resulting from the movement converter (2) to the expected metering,
    - supplying the hydraulic machine inlet with the main liquid in accordance with a predetermined flow rate, such that the supply to the hydraulic machine actuates the displacement pump which thus supplies additive to the hydraulic machine outlet (11), or an injection T supplied by the hydraulic machine outlet (11) and by the displacement pump outlet (41) if the pump outlet is equipped with an injection T, the additive mixing with the main liquid.
EP22709673.2A 2021-03-02 2022-02-25 Method and pump for low-flow proportional metering Active EP4301981B1 (en)

Applications Claiming Priority (2)

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FR2102019A FR3120402B1 (en) 2021-03-02 2021-03-02 METHOD AND PROPORTIONAL DOSING PUMP WITH LOW FLOW
PCT/EP2022/054788 WO2022184576A1 (en) 2021-03-02 2022-02-25 Method and pump for low-flow proportional metering

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EP4301981C0 (en) 2024-12-11
WO2022184576A1 (en) 2022-09-09
FR3120402B1 (en) 2023-04-14
CN116917619A (en) 2023-10-20
ES3007983T3 (en) 2025-03-21
US20240309864A1 (en) 2024-09-19
JP7774069B2 (en) 2025-11-20
CA3209186A1 (en) 2022-09-09
EP4301981A1 (en) 2024-01-10
IL305387A (en) 2023-10-01
PL4301981T3 (en) 2025-04-22
FR3120402A1 (en) 2022-09-09

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