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EP1351775A1 - Electronic micro-pump - Google Patents

Electronic micro-pump

Info

Publication number
EP1351775A1
EP1351775A1 EP01994873A EP01994873A EP1351775A1 EP 1351775 A1 EP1351775 A1 EP 1351775A1 EP 01994873 A EP01994873 A EP 01994873A EP 01994873 A EP01994873 A EP 01994873A EP 1351775 A1 EP1351775 A1 EP 1351775A1
Authority
EP
European Patent Office
Prior art keywords
piston
wall
chamber
micropump according
orifice
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.)
Granted
Application number
EP01994873A
Other languages
German (de)
French (fr)
Other versions
EP1351775B1 (en
Inventor
Jean-Louis Bougamont
Pierre Dumont
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.)
Silgan Dispensing Systems Le Treport SAS
Original Assignee
Rexam Dispensing Systems SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rexam Dispensing Systems SAS filed Critical Rexam Dispensing Systems SAS
Publication of EP1351775A1 publication Critical patent/EP1351775A1/en
Application granted granted Critical
Publication of EP1351775B1 publication Critical patent/EP1351775B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/08—Apparatus to be carried on or by a person, e.g. of knapsack type
    • B05B9/085—Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump
    • B05B9/0855—Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump the pump being motor-driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/0005—Components or details
    • B05B11/0062—Outlet valves actuated by the pressure of the fluid to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1066—Pump inlet valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1094—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle having inlet or outlet valves not being actuated by pressure or having no inlet or outlet valve

Definitions

  • the invention relates to a ⁇ electronic micropump.
  • This pump which is associated with a miniature electric actuator is intended for the distribution and / or dosing of liquid products such as perfumes, cosmetics or pharmaceutical compositions.
  • the traditional pumps used for these applications generally comprise a cylindrical body enclosing a metering chamber delimited by a piston and communicating, on the one hand, with a reservoir via a supply orifice provided with an inlet valve and, on the other hand, with the outside via an ejection orifice fitted with an exhaust valve.
  • These pumps are also provided with a push button covering a nozzle tube connected to the exhaust valve and allowing, by manual pressure, to push the piston into the chamber to evaluate the product under pressure.
  • a micropump characterized in that the piston is connected to an external alternating actuator and in that at least one of the valves consists of a sealing element capable of to be driven in translation, by friction contact with said piston, successively in one direction then in the other and whose stroke in the chamber is less than that of said piston.
  • said sealing element comprises at least one wall intended to come to seal in a sealed and periodic manner the ejection orifice or the supply orifice.
  • said wall is provided with a rod.
  • the ejection orifice is formed on the side wall of said body and said sealing element consists of a cylindrical-conical sleeve, the bottom of which forms the intake valve while its upper lateral edge forms the valve. exhaust.
  • the lower part of said socket includes at least one through lumen.
  • the side wall of said sleeve has guide ribs in contact with the internal wall of the chamber.
  • the internal part of the piston is provided with a lateral grooving and an upper lip ensuring the sealing and the upper stop of the stroke.
  • the bottom and / or the upper edge of the bushing comprise a peripheral ring coming into tight abutment respectively downwards or upwards against the wall of the chamber.
  • the ejection orifice opens axially into said chamber and said element closing the exhaust valve consists of a rod engaged on the one hand, with friction in a bore of the piston and provided with: on the other hand, a head carrying a transverse wall capable of coming into leaktight support against the axial ejection orifice.
  • said head is housed inside a cavity whose transverse walls form end-of-travel stops.
  • the supply orifice is formed on the side wall of said body and the shutter element of the intake valve consists of a jacket in which is engaged with friction contact the internal part piston.
  • said jacket cooperates with an annular shoulder formed on the internal side wall of the body to limit its travel.
  • the micropump of the invention offers great flexibility of use by allowing a continuous and regular distribution of the product. thanks to the high operating frequencies of the actuator (of the order of 30 to 150 Hz).
  • the friction connection can be obtained, for example, by making a slight radial tightening between the piston and the sealing element.
  • FIG. 1 represents a schematic sectional view of a first embodiment of the micropump of the invention
  • FIG. 2 represents a sectional view of a first variant of the micropump of FIG. 1,
  • FIG. 3 represents two half-views in section of a second variant of the micropump of FIG. 1 in two distinct phases
  • FIG. 4 represents a schematic sectional view of a second embodiment of the micropump of the invention
  • FIG. 5 represents a sectional view of a first variant of the micropump of FIG. 4,
  • FIG. 6 represents a sectional view of a second variant of the micropump of FIG. 4.
  • the micropump shown in the figures is provided with a cylindrical body 1 enclosing a metering chamber 10.
  • the chamber 10 has a variable volume being delimited by a piston 2 whose end 2a is capable of penetrating inside the bedroom.
  • the chamber 10 communicates, on the one hand, with a reservoir (not shown) via a supply orifice 10a connected, if necessary, to a dip tube 4 and, on the other hand, with the outside via an orifice d ejection 10b connected here to a conduit 5.
  • the supply orifice 10a is provided with an intake valve while the ejection orifice 10b is provided with an exhaust valve.
  • the piston 2 is connected in its external part 2b to an alternative actuator such as an electric micromotor and possibly to a transmission member (not shown) likely to transform a rotational movement into translation and to communicate to the piston an axial reciprocating movement.
  • an alternative actuator such as an electric micromotor and possibly to a transmission member (not shown) likely to transform a rotational movement into translation and to communicate to the piston an axial reciprocating movement.
  • this movement has the effect, in the direction of withdrawal, of creating a depression in the chamber 10 and thus of sucking the liquid product P from the reservoir and in the other direction (direction of introduction) of compressing the product P via the supply orifice 10a and discharge it outwards into the chamber via the exhaust orifice 10b.
  • At least one of the intake and exhaust valves to consist of a sealing element capable of being driven in alternative translation by friction contact with the internal part. 2a of the piston 2 and therefore the stroke inside the chamber 10 is less than that of the piston.
  • This sealing element comprises at least one wall intended to come to close in a sealed and periodic manner, the supply orifice 10a or the ejection orifice 10b.
  • the supply orifice 10a is formed axially in the bottom of the chamber 10, while the ejection orifice 10b is produced through the side wall of the body 1 in part high.
  • the piston 2 is in the form of a solid cylindrical rod, with a bevelled lower edge.
  • the shutter element here consists of a cylindrical-conical socket 3, the flat wall of the bottom 3a forms the intake valve and the cylindrical wall of the upper lateral edge 3b, the exhaust valve.
  • the lower part of the sleeve 3 comprises at least one through-hole 30 ensuring the filling of the sleeve, with the liquid product P, during admission.
  • the internal part 2a of the piston 2 is provided with a lateral grooving 20 and an upper peripheral lip 21 cooperating with a shoulder 11 of the body 1 for sealing and forming the upper stop of the stroke.
  • the grooving 20 defines a cylindrical surface which provides friction contact against the inner dynamic side wall of the bush 3.
  • the external lateral wall of the sleeve 3 has guide ribs 31 in contact with the internal wall of the chamber 10.
  • the base 3a of the socket 3 and also, here, its upper rim 3c, comprise a peripheral ring 33 which comes into sealing abutment respectively downwards against the bottom 13a of the chamber 10 around the orifice 10a or towards the high against a constriction 13b bordering the orifice 10b.
  • the distance separating the constriction 13b from the bottom 13a therefore delimits the axial stroke of the sleeve 3 in the chamber 10.
  • the stroke of the piston 2 is, in turn, determined by the amplitude of movement of the actuator.
  • the piston 2 In the intake phase, the piston 2 is pulled axially outward from the body 1 and here upward, by the actuator by frictionally driving the bushing 3 in the chamber 10 from the bottom 13a.
  • This movement which constitutes the first stage of the pump operating cycle, raises the base 3a of the socket and releases the orifice 10a.
  • the progressive withdrawal of the lip 21 of the piston 2 increases the free volume of the chamber 10 by creating a depression quickly compensated for by the arrival of the product P via the orifice 10a.
  • the ejection orifice 10b Jointly, the ejection orifice 10b is closed by the wall of the upper edge 3b of the sleeve 3 thus preventing any parasitic entry of the product being downstream of the ejection orifice.
  • the upper edge 3b of the sleeve 3 remains in sealed contact with the internal wall of the body 1.
  • the openings 30 constitute an obligatory passage for the product P in the direction of the orifice 10b.
  • the piston 2 is pushed axially towards the inside of the body 1 by the actuator. This movement is accompanied, firstly, by the descent of the sleeve 3 into the chamber 10 due to the friction contact connection.
  • the sleeve 3 releases the ejection orifice 10b and opens the exhaust valve. Under the pressure created by the piston 2, the product P then exits through the conduit 5. When the rod 33 of the base 3a reaches the bottom 13a of the chamber, the intake valve closes and prevents any parasitic output of product through port 10a.
  • the piston 2 continues its stroke and compresses the residue of product P still in the chamber 10 which flows through the slots 30 and the ribs 20 towards the orifice 10b, until the end of the travel of the piston 2.
  • the four-stage cycle is completed and the new intake phase for the next cycle can begin immediately.
  • the feed port 10a is formed through the side wall of the chamber 10 like the ejection port 10b but in the lower part and, here, diametrically opposite.
  • the light 30 is produced, centrally, through the base 3a of the socket 3.
  • This configuration which is simpler to manufacture, can also prove to be particularly advantageous from the point of view of the overall size of the pump in the packaging device.
  • the body is produced in two parts 1a, 1b respectively lower and upper, secured to one another by means of snap-fastening members 14.
  • the half-view on the left represents this variant in the final position of the delivery phase while the half-view on the right represents it in the final position of the intake phase.
  • the internal part of the piston 2 is produced here in the form of a coupling sleeve 22 intended to frictionally cover a cylindrical central hub 32 carried by the sleeve 3.
  • the piston 2 also comprises, in the upper part, a peripheral rib 23 in sealed sliding contact with the internal wall of the chamber 10.
  • the upper edge of the sleeve 22 is connected via a flange 24 to its external part 2b ensuring the connection to the actuator.
  • the side wall 25 of the sleeve 22 provides an intermediate space with the side wall 34 of the sleeve 3.
  • the intake valve consists of the base 3a of the bushing provided with a peripheral ring 33 intended to surround the supply orifice 10a in a coaxial and sealed manner.
  • the slots 30 are produced through the base 3a and outside the rod 33 radially.
  • the sealing wall 3b of the exhaust valve is made in radial offset on the side wall 34 of the socket 3.
  • the outside diameter of the socket 3 is slightly greater than the inside diameter of the chamber 10 and due to the flexibility of its wall lateral, the sleeve 3 is housed under elastic stresses in the upper part 1b of the body.
  • the ejection orifice 10b opens axially and in the upper part into the chamber 10, while the supply orifice 10a is lateral.
  • the closing element of the exhaust valve here consists of a rod 6 engaged on the one hand, with friction, in a central bore 26 of the piston 2 and provided, on the other hand, with a head 61 carrying a wall frustoconical 6b likely to come into support during the admission phase tight against the ejection orifice 10b, also frustoconical in profile, forming a valve.
  • the head 61 of the valve comes into contact with the internal shoulder 10e by means of ribs or grooves 6c formed on the top of the head 61. These ribs or grooves 6c thus allow the passage of the product. forced out.
  • the largest diameter of the head 61 is greater than that of the cylindrical body 6a of the rod 6.
  • the head 61 is trapped with freedom of translation inside a cavity 10c, the transverse walls of which therefore form two end-of-travel stops and which communicate with the chamber 10 by a cylindrical conduit 10d.
  • the profile of the upstream transverse wall of the cavity 10c, forming the valve seat and delimiting the ejection orifice 10b, is adapted to the frustoconical geometry of the wall 6b of the head 61.
  • the shutter element of the intake valve consists of the side wall 25 of the piston 2 provided, where appropriate, with peripheral seals 27.
  • the closing element of the intake valve consists of a jacket 7 in which is engaged, coaxially and with friction contact, the internal part 2a of the piston 2.
  • the jacket 7 is produced with two different diameters so as to cooperate with an annular peripheral shoulder 17 formed on the internal lateral wall of the body 1 to limit its travel.
  • the position of the shoulder 17 is determined in particular as a function of the height of the jacket 7, so that in the delivery phase, the free edge 7a of the external wall of the jacket 7 can come to seal supply port 10a.
  • the piston 2 is therefore here in friction contact with two independent sealing elements, the respective strokes of which can be optimally adjusted.
  • the ejection conduit 10d defines, at the intersection with the upstream wall of the cavity 10c, a wedge 10f ensuring in contact with the wall 6b a circular sealing line in the closed position of the valve exhaust.
  • the pump comprises a cover 8 removably fixed (by screwing or snap-fastening) on the upper part of the body 1.
  • the head 61 is here produced in cylindrical form with a ring 66 ensuring closing the ejection orifice 10b by sealed contact on a circular line with the inclined wall opposite.
  • the cover 8 is provided with a spray orifice 80 and an upstream network of swirl channels (not shown) formed on its internal wall.
  • the rod 6 of the closing element of the exhaust valve extends, beyond the head 61, by a core 60 capable of closing the vortex channels in its high position, in the discharge phase.
  • the core 60 is made in one piece with the rod 6 and in the extension of the head 61.
  • This cover 8 when the pump is stopped, is actuated by screwing or latching by applying pressure to the core 60 which forces the wall 6b of the rod head into contact with the wall of the orifice 10b. This positive contact ensures the overall tightness of the system, regardless of the stop position of the electric actuator. But when the actuator stops, the piston 2 is blocked in a random position.

Landscapes

  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Saccharide Compounds (AREA)

Abstract

A micropump provided with a cylindrical body ( 1 ) containing a measuring chamber ( 10 ) defined by a piston ( 2 ) and communicating firstly with a tank via an inlet orifice ( 10 a) provided with an inlet valve, and secondly with the outside via an outlet orifice ( 10 b) provided with an outlet valve, the micropump being characterized in that the piston ( 2 ) is connected to an external reciprocating actuator, and in that at least one of said valves is constituted by a valve member ( 3, 6, 7 ) suitable for being driven in translation by friction contact with said piston ( 2 ) successively in one direction and then in the other, and whose stroke inside the chamber ( 10 ) is shorter than the stroke of said piston.

Description

Micropompe électronique Electronic micropump
La présente invention concerne une micropompe électronique^. Cette pompe qui est associée à un actionneur électrique miniature est destinée à la distribution et/ou au dosage de produits liquides tels que parfums, cosmétiques ou compositions pharmaceutiques.The invention relates to a ^ electronic micropump. This pump which is associated with a miniature electric actuator is intended for the distribution and / or dosing of liquid products such as perfumes, cosmetics or pharmaceutical compositions.
Les pompes traditionnelles utilisées pour ces applications comportent généralement un corps cylindrique renfermant une chambre de dosage délimitée par un piston et communiquant, d'une part, avec un réservoir via un orifice d'alimentation muni d'un clapet d'admission et, d'autre part, avec l'extérieur via un orifice d'éjection muni d'un clapet d'échappement.The traditional pumps used for these applications generally comprise a cylindrical body enclosing a metering chamber delimited by a piston and communicating, on the one hand, with a reservoir via a supply orifice provided with an inlet valve and, on the other hand, with the outside via an ejection orifice fitted with an exhaust valve.
Ces pompes sont pourvues, en outre, d'un bouton-poussoir coiffant un tube gicleur raccordé au clapet d'échappement et permettant, par appui manuel, d'enfoncer le piston dans la chambre pour évaluer le produit sous pression.These pumps are also provided with a push button covering a nozzle tube connected to the exhaust valve and allowing, by manual pressure, to push the piston into the chamber to evaluate the product under pressure.
Cependant, dans certains cas, il peut s'avérer utile de motoriser le fonctionnement de ces pompes, ne serait-ce que pour obtenir un plus grand confort d'utilisation grâce à une pulvérisation continue à la manière des distributeurs aérosols à gaz propulseur. Or, la structure des pompes traditionnelles n'est pas adaptée à un mode de fonctionnement continu en particulier du fait que les clapets ont des comportements mécanique et hydraulique incompatibles avec les fréquences usuelles des actionneurs électriques miniatures tels que des moteurs et en particulier une trop grande inertie. La présente invention a pour but de remédier à ces problèmes techniques en modifiant et en adaptant la structure de la pompe à des actionneurs alternatifs extérieurs.However, in certain cases, it may prove useful to motorize the operation of these pumps, if only to obtain greater comfort of use thanks to continuous spraying in the manner of propellant aerosol dispensers. However, the structure of traditional pumps is not suitable for a continuous mode of operation in particular because the valves have mechanical and hydraulic behaviors incompatible with the usual frequencies of miniature electric actuators such as motors and in particular too large. inertia. The present invention aims to remedy these technical problems by modifying and adapting the structure of the pump to external reciprocating actuators.
Ce but est atteint, selon l'invention, au moyen d'une micropompe, caractérisée en ce que le piston est raccordé à un actionneur alternatif extérieur et en ce qu'au moins l'un des clapets est constitué d'un élément obturant susceptible d'être entraîné en translation, par contact de friction avec ledit piston, successivement dans un sens puis dans l'autre et dont la course dans la chambre est inférieure à celle dudit piston.This object is achieved, according to the invention, by means of a micropump, characterized in that the piston is connected to an external alternating actuator and in that at least one of the valves consists of a sealing element capable of to be driven in translation, by friction contact with said piston, successively in one direction then in the other and whose stroke in the chamber is less than that of said piston.
Selon une caractéristique avantageuse, ledit élément obturant comporte au moins une paroi destinée à venir fermer de manière étanche et périodique l'orifice d'éjection ou l'orifice d'alimentation. Selon une variante, ladite paroi est pourvue d'un jonc.According to an advantageous characteristic, said sealing element comprises at least one wall intended to come to seal in a sealed and periodic manner the ejection orifice or the supply orifice. According to a variant, said wall is provided with a rod.
Selon un premier mode de réalisation, l'orifice d'éjection est ménagé sur la paroi latérale dudit corps et ledit élément obturant est constitué d'une douille cylindroconique dont le fond forme le clapet d'admission tandis que son bord latéral supérieur forme le clapet d'échappement.According to a first embodiment, the ejection orifice is formed on the side wall of said body and said sealing element consists of a cylindrical-conical sleeve, the bottom of which forms the intake valve while its upper lateral edge forms the valve. exhaust.
Selon une caractéristique spécifique, la partie inférieure de ladite douille comporte au moins une lumière traversante. Selon une autre caractéristique, la paroi latérale de ladite douille comporte des nervures de guidage en contact avec la paroi interne de la chambre.According to a specific characteristic, the lower part of said socket includes at least one through lumen. According to another characteristic, the side wall of said sleeve has guide ribs in contact with the internal wall of the chamber.
De préférence, la partie interne du piston est pourvue d'un rainurage latéral et d'une lèvre supérieure assurant l'étanchéité et la butée haute de la course.Preferably, the internal part of the piston is provided with a lateral grooving and an upper lip ensuring the sealing and the upper stop of the stroke.
Selon une variante particulière, le fond et/ou le rebord supérieur de la douille comportent un jonc périphérique venant en butée étanche respectivement vers le bas ou vers le haut contre la paroi de la chambre. Selon un second mode de réalisation, l'orifice d'éjection débouche axialement dans ladite chambre et ledit élément obturant du clapet d'échappement est constitué d'une tige engagée d'une part, avec friction dans un alésage du piston et munie, d'autre part, d'une tête portant une paroi transversale susceptible de venir en appui étanche contre l'orifice d'éjection axial.According to a particular variant, the bottom and / or the upper edge of the bushing comprise a peripheral ring coming into tight abutment respectively downwards or upwards against the wall of the chamber. According to a second embodiment, the ejection orifice opens axially into said chamber and said element closing the exhaust valve consists of a rod engaged on the one hand, with friction in a bore of the piston and provided with: on the other hand, a head carrying a transverse wall capable of coming into leaktight support against the axial ejection orifice.
De préférence, ladite tête est logée à l'intérieur d'une cavité dont les parois transversales forment des butées de fin de course.Preferably, said head is housed inside a cavity whose transverse walls form end-of-travel stops.
Selon un autre mode de réalisation, l'orifice d'alimentation est ménagé sur la paroi latérale dudit corps et l'élément d'obturation du clapet d'admission est constitué d'une chemise dans laquelle est engagée avec contact de friction la partie interne du piston.According to another embodiment, the supply orifice is formed on the side wall of said body and the shutter element of the intake valve consists of a jacket in which is engaged with friction contact the internal part piston.
De préférence, ladite chemise coopère avec un épaulement annulaire ménagé sur la paroi latérale interne du corps pour limiter sa course. La micropompe de l'invention offre une grande souplesse d'utilisation en permettant une distribution continue et régulière du produit grâce aux fréquences élevées de fonctionnement de l'actionneur (de l'ordre de 30 à 150 Hz).Preferably, said jacket cooperates with an annular shoulder formed on the internal side wall of the body to limit its travel. The micropump of the invention offers great flexibility of use by allowing a continuous and regular distribution of the product. thanks to the high operating frequencies of the actuator (of the order of 30 to 150 Hz).
En effet, les déplacements très rapides des éléments obturants des clapets s'effectuent sans à coups du fait de la friction qui assure un freinage.In fact, the very rapid movements of the shutter elements of the valves are carried out smoothly due to the friction which ensures braking.
La liaison par friction peut être obtenue, par exemple, en réalisant un léger serrage radial entre le piston et l'élément obturant.The friction connection can be obtained, for example, by making a slight radial tightening between the piston and the sealing element.
L'invention sera mieux comprise à la lecture de la description qui va suivre en référence aux dessins, sur lesquels : - la figure 1 représente une vue schématique en coupe d'un premier mode de réalisation de la micropompe de l'invention,The invention will be better understood on reading the description which will follow with reference to the drawings, in which: FIG. 1 represents a schematic sectional view of a first embodiment of the micropump of the invention,
- la figure 2 représente une vue en coupe d'une première variante de la micropompe de la figure 1 ,FIG. 2 represents a sectional view of a first variant of the micropump of FIG. 1,
- la figure 3 représente deux demi-vues en coupe d'une seconde variante de la micropompe de la figure 1 dans deux phases distinctes,FIG. 3 represents two half-views in section of a second variant of the micropump of FIG. 1 in two distinct phases,
- la figure 4 représente une vue schématique en coupe d'un second mode de réalisation de la micropompe de l'invention,FIG. 4 represents a schematic sectional view of a second embodiment of the micropump of the invention,
- la figure 5 représente une vue en coupe d'une première variante de la micropompe de la figure 4,FIG. 5 represents a sectional view of a first variant of the micropump of FIG. 4,
- la figure 6 représente une vue en coupe d'une seconde variante de la micropompe de la figure 4.FIG. 6 represents a sectional view of a second variant of the micropump of FIG. 4.
La micropompe représentée sur les figures est pourvue d'un corps cylindrique 1 renfermant une chambre de dosage 10. La chambre 10 a un volume variable en étant délimitée par un piston 2 dont l'extrémité 2a est susceptible de pénétrer à l'intérieur de la chambre.The micropump shown in the figures is provided with a cylindrical body 1 enclosing a metering chamber 10. The chamber 10 has a variable volume being delimited by a piston 2 whose end 2a is capable of penetrating inside the bedroom.
La chambre 10 communique, d'une part, avec un réservoir (non représenté) via un orifice d'alimentation 10a raccordé, le cas échéant, à un tube plongeur 4 et, d'autre part, avec l'extérieur via un orifice d'éjection 10b raccordé ici à un conduit 5.The chamber 10 communicates, on the one hand, with a reservoir (not shown) via a supply orifice 10a connected, if necessary, to a dip tube 4 and, on the other hand, with the outside via an orifice d ejection 10b connected here to a conduit 5.
L'orifice d'alimentation 10a est muni d'un clapet d'admission tandis que l'orifice d'éjection 10b est pourvu d'un clapet d'échappement.The supply orifice 10a is provided with an intake valve while the ejection orifice 10b is provided with an exhaust valve.
Selon l'invention, le piston 2 est raccordé dans sa partie externe 2b à un actionneur alternatif tel qu'un micromoteur électrique et éventuellement à un organe de transmission (non représentés) susceptibles de transformer un mouvement de rotation en translation et de communiquer au piston un mouvement de va-et-vient axial. De manière classique, ce mouvement a pour effet, dans le sens du retrait, de créer une dépression dans la chambre 10 et d'aspirer ainsi le produit liquide P depuis le réservoir et dans l'autre sens (sens d'introduction) de comprimer le produit P via l'orifice d'alimentation 10a et de le refouler vers l'extérieur dans la chambre via l'orifice d'échappement 10b.According to the invention, the piston 2 is connected in its external part 2b to an alternative actuator such as an electric micromotor and possibly to a transmission member (not shown) likely to transform a rotational movement into translation and to communicate to the piston an axial reciprocating movement. Conventionally, this movement has the effect, in the direction of withdrawal, of creating a depression in the chamber 10 and thus of sucking the liquid product P from the reservoir and in the other direction (direction of introduction) of compressing the product P via the supply orifice 10a and discharge it outwards into the chamber via the exhaust orifice 10b.
Toutefois, à la différence des pompes traditionnelles où le piston est actionné manuellement au moyen d'un bouton-poussoir et rappelé en position haute par un organe de rappel, le piston est ici déplacé en translation alternative rapide avec des fréquences élevées et en sollicitant des volumes très faibles de produit P, ce qui nécessite des clapets spécifiques.However, unlike traditional pumps where the piston is actuated manually by means of a push button and returned to the high position by a return member, the piston is here moved in rapid alternating translation with high frequencies and by requesting very low volumes of product P, which requires specific valves.
Toujours selon l'invention, il est donc prévu, qu'au moins l'un des clapets d'admission et d'échappement soit constitué d'un élément obturant susceptible d'être entraîné en translation alternative par contact de friction avec la partie interne 2a du piston 2 et donc la course à l'intérieur de la chambre 10 est inférieure à celle du piston.Still according to the invention, provision is therefore made for at least one of the intake and exhaust valves to consist of a sealing element capable of being driven in alternative translation by friction contact with the internal part. 2a of the piston 2 and therefore the stroke inside the chamber 10 is less than that of the piston.
Cet élément obturant comporte au moins une paroi destinée à venir fermer de manière étanche et périodique, l'orifice d'alimentation 10a ou l'orifice d'éjection 10b.This sealing element comprises at least one wall intended to come to close in a sealed and periodic manner, the supply orifice 10a or the ejection orifice 10b.
Dans le mode de réalisation de la figure 1, l'orifice d'alimentation 10a est ménagé axialement dans le fond de la chambre 10, tandis que l'orifice d'éjection 10b est réalisé au travers de la paroi latérale du corps 1 en partie haute.In the embodiment of FIG. 1, the supply orifice 10a is formed axially in the bottom of the chamber 10, while the ejection orifice 10b is produced through the side wall of the body 1 in part high.
Le piston 2 est sous forme d'une tige pleine cylindrique, à bord inférieur biseauté.The piston 2 is in the form of a solid cylindrical rod, with a bevelled lower edge.
L'élément obturant est ici constitué d'une douille 3 cylindroconique dont la paroi plane du fond 3a forme le clapet d'admission et la paroi cylindrique du bord latéral supérieur 3b, le clapet d'échappement.The shutter element here consists of a cylindrical-conical socket 3, the flat wall of the bottom 3a forms the intake valve and the cylindrical wall of the upper lateral edge 3b, the exhaust valve.
La partie inférieure de la douille 3 comporte au moins une lumière traversante 30 assurant le remplissage de la douille, par le produit liquide P, lors de l'admission. La partie interne 2a du piston 2 est pourvue d'un rainurage latéral 20 et d'une lèvre périphérique supérieure 21 coopérant avec un épaulement 11 du corps 1 pour assurer l'étanchéité et former la butée haute de la course.The lower part of the sleeve 3 comprises at least one through-hole 30 ensuring the filling of the sleeve, with the liquid product P, during admission. The internal part 2a of the piston 2 is provided with a lateral grooving 20 and an upper peripheral lip 21 cooperating with a shoulder 11 of the body 1 for sealing and forming the upper stop of the stroke.
Le rainurage 20 délimite une portée cylindrique qui assure le contact avec friction contre la paroi latérale dynamique intérieure de la douille 3.The grooving 20 defines a cylindrical surface which provides friction contact against the inner dynamic side wall of the bush 3.
La paroi latérale extérieure de la douille 3 comporte des nervures 31 de guidage en contact avec la paroi interne de la chambre 10.The external lateral wall of the sleeve 3 has guide ribs 31 in contact with the internal wall of the chamber 10.
L'embase 3a de la douille 3 et aussi, ici, son rebord supé- rieur 3c, comportent un jonc périphérique 33 venant en butée étanche respectivement vers le bas contre le fond 13a de la chambre 10 autour de l'orifice 10a ou vers le haut contre un rétreint 13b bordant l'orifice 10b.The base 3a of the socket 3 and also, here, its upper rim 3c, comprise a peripheral ring 33 which comes into sealing abutment respectively downwards against the bottom 13a of the chamber 10 around the orifice 10a or towards the high against a constriction 13b bordering the orifice 10b.
La distance séparant le rétreint 13b du fond 13a délimite donc la course axiale de la douille 3 dans la chambre 10. La course du piston 2 est, quant à elle, déterminée par l'amplitude de déplacement de ('actionneur.The distance separating the constriction 13b from the bottom 13a therefore delimits the axial stroke of the sleeve 3 in the chamber 10. The stroke of the piston 2 is, in turn, determined by the amplitude of movement of the actuator.
Dans la phase d'admission, le piston 2 est tiré axialement vers l'extérieur du corps 1 et ici vers le haut, par l'actionneur en entraînant par friction la douille 3 dans la chambre 10 depuis le fond 13a. Ce déplacement qui constitue le premier temps du cycle de fonctionnement de la pompe soulève l'embase 3a de la douille et libère l'orifice 10a. Le retrait progressif de la lèvre 21 du piston 2 augmente le volume libre de la chambre 10 en créant une dépression vite compensée par l'arrivée du produit P via l'orifice 10a. Conjointement, l'orifice d'éjection 10b est obturé par la paroi du bord supérieur 3b de la douille 3 interdisant ainsi toute entrée parasite du produit se trouvant en aval de l'orifice d'éjection. Lors de son déplacement dans la chambre 10, le bord supérieur 3b de la douille 3 reste en contact étanche avec la paroi interne du corps 1. Ainsi, les lumières 30 constituent-elles un passage obligatoire pour le produit P en direction de l'orifice 10b.In the intake phase, the piston 2 is pulled axially outward from the body 1 and here upward, by the actuator by frictionally driving the bushing 3 in the chamber 10 from the bottom 13a. This movement, which constitutes the first stage of the pump operating cycle, raises the base 3a of the socket and releases the orifice 10a. The progressive withdrawal of the lip 21 of the piston 2 increases the free volume of the chamber 10 by creating a depression quickly compensated for by the arrival of the product P via the orifice 10a. Jointly, the ejection orifice 10b is closed by the wall of the upper edge 3b of the sleeve 3 thus preventing any parasitic entry of the product being downstream of the ejection orifice. During its movement in the chamber 10, the upper edge 3b of the sleeve 3 remains in sealed contact with the internal wall of the body 1. Thus, the openings 30 constitute an obligatory passage for the product P in the direction of the orifice 10b.
Lorsque le jonc 33 du rebord 3c atteint le rétreint 13b, la douille est immobilisée en butée supérieure mais le piston 2 peut lui encore, dans un deuxième temps, poursuivre sa course vers le haut jusqu'à ce que sa lèvre 21 vienne au contact de l'épaulement 11 du corps 1. Dans cette position, représentée sur la figure 1 , tout le volume interne de la chambre 10 est occupé par le produit P y compris à l'intérieur de la douille grâce aux lumières 30 et autour du piston grâce aux rainures 20. La durée de cette première phase à deux temps est d'environWhen the ring 33 of the rim 3c reaches the constriction 13b, the sleeve is immobilized in upper stop but the piston 2 can still, in a second step, continue its upward movement until its lip 21 comes into contact with the shoulder 11 of the body 1. In this position, represented in FIG. 1, the entire internal volume of the chamber 10 is occupied by the product P including inside the bushing thanks to the slots 30 and around the piston thanks to the grooves 20. The duration of this first two-stroke phase is about
1/60 à 1/300 seconde avec un micromoteur travaillant entre 30 et 150 Hz.1/60 to 1/300 second with a micromotor working between 30 and 150 Hz.
Dans la phase successive de refoulement, le piston 2 est poussé axialement vers l'intérieur du corps 1 par l'actionneur. Ce déplacement s'accompagne, dans un premier temps, de la descente de la douille 3 dans la chambre 10 du fait du contact de liaison avec friction.In the successive delivery phase, the piston 2 is pushed axially towards the inside of the body 1 by the actuator. This movement is accompanied, firstly, by the descent of the sleeve 3 into the chamber 10 due to the friction contact connection.
En descendant, la douille 3 libère l'orifice d'éjection 10b et ouvre le clapet d'échappement. Sous la pression créée par le piston 2, le produit P sort alors par le conduit 5. Lorsque le jonc 33 de l'embase 3a atteint le fond 13a de la chambre, le clapet d'admission se ferme et interdit toute sortie parasite de produit par l'orifice 10a.Going down, the sleeve 3 releases the ejection orifice 10b and opens the exhaust valve. Under the pressure created by the piston 2, the product P then exits through the conduit 5. When the rod 33 of the base 3a reaches the bottom 13a of the chamber, the intake valve closes and prevents any parasitic output of product through port 10a.
Enfin, dans un deuxième temps, le piston 2 poursuit sa course et comprime le reliquat de produit P se trouvant encore dans la chambre 10 qui flue par les lumières 30 et les nervures 20 vers l'orifice 10b, jusqu'à fin de course du piston 2. A ce moment, le cycle en quatre temps est terminé et la nouvelle phase d'admission du cycle suivant peut commencer immédiatement.Finally, in a second step, the piston 2 continues its stroke and compresses the residue of product P still in the chamber 10 which flows through the slots 30 and the ribs 20 towards the orifice 10b, until the end of the travel of the piston 2. At this point, the four-stage cycle is completed and the new intake phase for the next cycle can begin immediately.
Dans la variante représentée sur la figure 2, l'orifice d'alimentation 10a est ménagé au travers de la paroi latérale de la chambre 10 tout comme l'orifice d'éjection 10b mais en partie basse et, ici, de façon diamétralement opposée.In the variant shown in Figure 2, the feed port 10a is formed through the side wall of the chamber 10 like the ejection port 10b but in the lower part and, here, diametrically opposite.
La lumière 30 est réalisée, de façon centrale, au travers de l'embase 3a de la douille 3.The light 30 is produced, centrally, through the base 3a of the socket 3.
Cette configuration, qui est de fabrication plus simple, peut se révéler aussi particulièrement avantageuse du point de vue de l'encombrement global de la pompe dans le dispositif de conditionnement.This configuration, which is simpler to manufacture, can also prove to be particularly advantageous from the point of view of the overall size of the pump in the packaging device.
Dans la variante représentée sur la figure 3, le corps est réalisé en deux parties 1a, 1b respectivement inférieure et supérieure, solidarisées l'une avec l'autre au moyen d'organes d'encliquetage 14. La demi-vue de gauche représente cette variante dans la position finale de la phase de refoulement tandis que la demi-vue de droite la représente dans la position finale de la phase d'admission.In the variant shown in FIG. 3, the body is produced in two parts 1a, 1b respectively lower and upper, secured to one another by means of snap-fastening members 14. The half-view on the left represents this variant in the final position of the delivery phase while the half-view on the right represents it in the final position of the intake phase.
La partie interne du piston 2 est réalisée ici sous forme d'un manchon d'accouplement 22 destiné à coiffer avec friction un moyeu central cylindrique 32 porté par la douille 3. Le piston 2 comporte en outre, en partie supérieure, une nervure périphérique 23 en contact de glissement étanche avec la paroi interne de la chambre 10.The internal part of the piston 2 is produced here in the form of a coupling sleeve 22 intended to frictionally cover a cylindrical central hub 32 carried by the sleeve 3. The piston 2 also comprises, in the upper part, a peripheral rib 23 in sealed sliding contact with the internal wall of the chamber 10.
Le bord supérieur du manchon 22 se raccorde via une collerette 24 à sa partie externe 2b assurant le raccordement à l'action- neur.The upper edge of the sleeve 22 is connected via a flange 24 to its external part 2b ensuring the connection to the actuator.
La paroi latérale 25 du manchon 22 ménage avec la paroi latérale 34 de la douille 3 un espace intercalaire.The side wall 25 of the sleeve 22 provides an intermediate space with the side wall 34 of the sleeve 3.
Le bord supérieur de la paroi latérale 34 de la douille 3 forme la paroi obturante 3b du clapet d'échappement comme dans les variantes précédemment décrites. Le clapet d'admission est constitué de l'embase 3a de fa douille pourvue d'un jonc périphérique 33 destiné à entourer de façon coaxiale et étanche l'orifice d'alimentation 10a.The upper edge of the side wall 34 of the sleeve 3 forms the sealing wall 3b of the exhaust valve as in the variants described above. The intake valve consists of the base 3a of the bushing provided with a peripheral ring 33 intended to surround the supply orifice 10a in a coaxial and sealed manner.
Les lumières 30 sont réalisées au travers de l'embase 3a et à l'extérieur radialement du jonc 33.The slots 30 are produced through the base 3a and outside the rod 33 radially.
La paroi obturante 3b du clapet d'échappement est réalisée en déport radial sur la paroi latérale 34 de la douille 3. Le diamètre extérieur de la douille 3 est légèrement supérieur au diamètre intérieur de la chambre 10 et du fait de la flexibilité de sa paroi latérale, la douille 3 est logée sous contraintes élastiques dans la partie supérieure 1b du corps. Ainsi, lorsque la paroi 3b se présente en regard de l'orifice d'éjection 10b, elle se plaque de façon étanche contre ledit orifice à la manière du bouchon comme représenté sur la demi-vue droite.The sealing wall 3b of the exhaust valve is made in radial offset on the side wall 34 of the socket 3. The outside diameter of the socket 3 is slightly greater than the inside diameter of the chamber 10 and due to the flexibility of its wall lateral, the sleeve 3 is housed under elastic stresses in the upper part 1b of the body. Thus, when the wall 3b is facing the ejection orifice 10b, it is pressed against the said orifice in a sealed manner in the manner of the plug as shown in the right half-view.
Dans le mode de réalisation représenté sur la figure 4, l'orifice d'éjection 10b débouche axialement et en partie supérieure dans la chambre 10, tandis que l'orifice d'alimentation 10a est latéral.In the embodiment shown in FIG. 4, the ejection orifice 10b opens axially and in the upper part into the chamber 10, while the supply orifice 10a is lateral.
L'élément obturant du clapet d'échappement est constitué ici d'une tige 6 engagée d'une part, avec friction, dans un alésage central 26 du piston 2 et munie, d'autre part, d'une tête 61 portant une paroi tronconique 6b susceptible de venir, en phase d'admission, en appui étanche contre l'orifice d'éjection 10b de profil également tronconique en formant soupape.The closing element of the exhaust valve here consists of a rod 6 engaged on the one hand, with friction, in a central bore 26 of the piston 2 and provided, on the other hand, with a head 61 carrying a wall frustoconical 6b likely to come into support during the admission phase tight against the ejection orifice 10b, also frustoconical in profile, forming a valve.
En phase d'expulsion, la tête 61 du clapet vient au contact de l'épaulement interne 10e par l'intermédiaire de nervures ou de saignées 6c ménagées sur le dessus de la tête 61. Ces nervures ou saignées 6c permettent ainsi le passage du produit expulsé.In the expulsion phase, the head 61 of the valve comes into contact with the internal shoulder 10e by means of ribs or grooves 6c formed on the top of the head 61. These ribs or grooves 6c thus allow the passage of the product. forced out.
Le plus grand diamètre de la tête 61 est supérieur à celui du corps cylindrique 6a de la tige 6.The largest diameter of the head 61 is greater than that of the cylindrical body 6a of the rod 6.
La tête 61 est emprisonnée avec liberté de translation à l'inté- rieur d'une cavité 10c dont les parois transversales forment donc deux butées de fin de course et qui communiquent avec la chambre 10 par un conduit cylindrique 10d.The head 61 is trapped with freedom of translation inside a cavity 10c, the transverse walls of which therefore form two end-of-travel stops and which communicate with the chamber 10 by a cylindrical conduit 10d.
Le profil de la paroi transversale amont de la cavité 10c, formant siège de soupape et délimitant l'orifice d'éjection 10b, est adapté à la géométrie tronconique de la paroi 6b de la tête 61.The profile of the upstream transverse wall of the cavity 10c, forming the valve seat and delimiting the ejection orifice 10b, is adapted to the frustoconical geometry of the wall 6b of the head 61.
L'élément obturant du clapet d'admission est constitué de la paroi latérale 25 du piston 2 pourvue, le cas échéant, de joints périphériques 27.The shutter element of the intake valve consists of the side wall 25 of the piston 2 provided, where appropriate, with peripheral seals 27.
Dans la première variante de réalisation de la figure 5, l'élément obturant du clapet d'admission est constitué d'une chemise 7 dans laquelle est engagée, de façon coaxiale et avec contact de friction, la partie interne 2a du piston 2.In the first alternative embodiment of FIG. 5, the closing element of the intake valve consists of a jacket 7 in which is engaged, coaxially and with friction contact, the internal part 2a of the piston 2.
La chemise 7 est réalisée avec deux diamètres différents de façon à coopérer avec un épaulement périphérique annulaire 17 ménagé sur la paroi latérale interne du corps 1 pour limiter sa course.The jacket 7 is produced with two different diameters so as to cooperate with an annular peripheral shoulder 17 formed on the internal lateral wall of the body 1 to limit its travel.
La position de l'épaulement 17 est déterminée notamment en fonction de la hauteur de la chemise 7, de telle sorte qu'en phase de refoulement, le bord libre 7a de la paroi externe de la chemise 7 puisse venir fermer de façon étanche l'orifice d'alimentation 10a. Le piston 2 est donc ici en contact de friction avec deux éléments obturants indépendants, dont les courses respectives peuvent être réglées de façon optimale.The position of the shoulder 17 is determined in particular as a function of the height of the jacket 7, so that in the delivery phase, the free edge 7a of the external wall of the jacket 7 can come to seal supply port 10a. The piston 2 is therefore here in friction contact with two independent sealing elements, the respective strokes of which can be optimally adjusted.
Cette variante permet ainsi, lors du recul du piston 2, d'obtenir conjointement une aspiration continue du produit P dans la chambre 10 et non une admission globale en fin de course. Toujours dans cette variante, le conduit d'éjection 10d définit, à l'intersection avec la paroi amont de la cavité 10c, un coin 10f assurant au contact de la paroi 6b une ligne d'étanchéité circulaire en position de fermeture du clapet d'échappement. Dans la seconde variante de réalisation représentée sur la figure 6, la pompe comprend un capot 8 fixé de façon amovible (par vissage ou encliquetage) sur la partie supérieure du corps 1. La tête 61 est ici réalisée sous forme cylindrique avec un jonc 66 assurant la fermeture de l'orifice d'éjection 10b par contact étanche sur une ligne circulaire avec la paroi inclinée en regard. Le capot 8 est pourvu d'un orifice de pulvérisation 80 et d'un réseau amont de canaux tourbillonnaires (non représentés) ménagés sur sa paroi interne.This variant thus makes it possible, during the retraction of the piston 2, to obtain jointly a continuous aspiration of the product P in the chamber 10 and not a global admission at the end of the stroke. Still in this variant, the ejection conduit 10d defines, at the intersection with the upstream wall of the cavity 10c, a wedge 10f ensuring in contact with the wall 6b a circular sealing line in the closed position of the valve exhaust. In the second embodiment shown in Figure 6, the pump comprises a cover 8 removably fixed (by screwing or snap-fastening) on the upper part of the body 1. The head 61 is here produced in cylindrical form with a ring 66 ensuring closing the ejection orifice 10b by sealed contact on a circular line with the inclined wall opposite. The cover 8 is provided with a spray orifice 80 and an upstream network of swirl channels (not shown) formed on its internal wall.
En outre, la tige 6 de l'élément obturant du clapet d'échappement se prolonge, au-delà de la tête 61, par un noyau 60 susceptible de fermer les canaux tourbillonnaires dans sa position haute, en phase de refoulement. Le noyau 60 est réalisé d'une seule pièce avec la tige 6 et dans le prolongement de la tête 61.In addition, the rod 6 of the closing element of the exhaust valve extends, beyond the head 61, by a core 60 capable of closing the vortex channels in its high position, in the discharge phase. The core 60 is made in one piece with the rod 6 and in the extension of the head 61.
Ce capot 8, lorsque la pompe est à l'arrêt, est actionné par vissage ou encliquetage en appliquant une pression sur le noyau 60 qui vient forcer le contact de la paroi 6b de la tête de tige contre la paroi de l'orifice 10b. Ce contact positif assure l'étanchéité globale du système, quelle que soit la position d'arrêt de l'actionnemeur électrique. Mais à l'arrêt de l'actionneur, le piston 2 se trouve bloqué dans une position aléatoire. This cover 8, when the pump is stopped, is actuated by screwing or latching by applying pressure to the core 60 which forces the wall 6b of the rod head into contact with the wall of the orifice 10b. This positive contact ensures the overall tightness of the system, regardless of the stop position of the electric actuator. But when the actuator stops, the piston 2 is blocked in a random position.

Claims

REVENDICATIONS
1. Micropompe pourvue d'un corps cylindrique (1) renfermant une chambre de dosage (10) délimitée par un piston (2) et communiquant, d'une part, avec un réservoir via un orifice d'alimentation (10a) muni d'un clapet d'admission et, d'autre part, avec l'extérieur via un orifice d'éjection (10b) muni d'un clapet d'échappement, caractérisée en ce que le piston (2) est raccordé à un actionneur alternatif extérieur et en ce qu'au moins l'un desdits clapets est constitué d'un élément obturant (3, 6, 7) susceptible d'être entraîné en translation, par contact de friction avec ledit piston (2), successivement dans un sens puis dans l'autre et dont la course dans la chambre (10) est inférieure à celle dudit piston.1. Micropump provided with a cylindrical body (1) enclosing a metering chamber (10) delimited by a piston (2) and communicating, on the one hand, with a reservoir via a supply orifice (10a) provided with an intake valve and, on the other hand, with the outside via an ejection orifice (10b) provided with an exhaust valve, characterized in that the piston (2) is connected to an external alternating actuator and in that at least one of said valves consists of a sealing element (3, 6, 7) capable of being driven in translation, by friction contact with said piston (2), successively in one direction then in the other and whose stroke in the chamber (10) is less than that of said piston.
2. Micropompe selon la revendication 1 , caractérisée en ce que ledit élément obturant (3, 6, 7) comporte au moins une paroi (3a, 3b, 6b, 7a) destinée à venir fermer de manière étanche et périodique l'orifice d'éjection (10b) ou l'orifice d'alimentation (10a).2. Micropump according to claim 1, characterized in that said obturating element (3, 6, 7) comprises at least one wall (3a, 3b, 6b, 7a) intended to close in a sealed and periodic manner the orifice of ejection (10b) or the feed port (10a).
3. Micropompe selon la revendication 2, caractérisée en ce que ladite paroi (3a, 3b, 6b, 7a) est pourvue d'un jonc (33, 66).3. Micropump according to claim 2, characterized in that said wall (3a, 3b, 6b, 7a) is provided with a rod (33, 66).
4. Micropompe selon l'une des revendications précédentes, caractérisée en ce que l'orifice d'éjection (10b) est ménagé sur la paroi latérale dudit corps (1) et en ce que ledit élément obturant est constitué d'une douille cylindroconique (3) dont le fond (3a) forme le clapet d'admission tandis que son bord latéral supérieur (3b) forme le clapet d'échappement. 4. Micropump according to one of the preceding claims, characterized in that the ejection orifice (10b) is formed on the side wall of said body (1) and in that said sealing element consists of a cylindrical-conical sleeve ( 3) whose bottom (3a) forms the intake valve while its upper lateral edge (3b) forms the exhaust valve.
5. Micropompe selon la revendication 4, caractérisée en ce que la partie inférieure de ladite douille (3) comporte au moins une lumière traversante (30).5. Micropump according to claim 4, characterized in that the lower part of said sleeve (3) comprises at least one through lumen (30).
6. Micropompe selon l'une des revendications 4 ou 5, caractérisée en ce que la paroi latérale de ladite douille (3) comporte des nervures de guidage (31) en contact avec la paroi interne de la chambre (10).6. Micropump according to one of claims 4 or 5, characterized in that the side wall of said sleeve (3) has guide ribs (31) in contact with the internal wall of the chamber (10).
7. Micropompe selon l'une des revendications 4 à 6, caractérisée en ce que la partie interne (2a) du piston (2) est pourvue d'un rainurage latéral (20) et d'une lèvre supérieure (21) assurant l'étanchéité et la butée haute de la course. 7. Micropump according to one of claims 4 to 6, characterized in that the internal part (2a) of the piston (2) is provided with a lateral grooving (20) and an upper lip (21) ensuring the sealing and the top stop of the stroke.
8. Micropompe selon l'une des revendications 4 à 7, caractérisée en ce que le fond (3a) et ou le rebord supérieur (3b) de la douille (3) comportent un jonc périphérique (33) venant en butée étanche respectivement vers le bas ou vers le haut contre la paroi de la chambre (10).8. Micropump according to one of claims 4 to 7, characterized in that the bottom (3a) and or the upper rim (3b) of the sleeve (3) comprise a peripheral ring (33) coming into tight abutment respectively towards the down or up against the wall of the chamber (10).
9. Micropompe selon l'une des revendications 1 à 3, caractérisée en ce que l'orifice d'éjection (10b) débouche axialement dans ladite chambre (10) et en ce que ledit élément obturant du clapet d'échappement est constitué d'une tige (6) engagée, d'une part, avec friction dans un alésage (26) du piston (2) et munie, d'autre part, d'une tête (61) portant une paroi transversale susceptible de venir en appui étanche contre l'orifice (6b) d'éjection axial (10b).9. Micropump according to one of claims 1 to 3, characterized in that the ejection orifice (10b) opens axially in said chamber (10) and in that said element closing the exhaust valve consists of a rod (6) engaged, on the one hand, with friction in a bore (26) of the piston (2) and provided, on the other hand, with a head (61) carrying a transverse wall capable of coming into leaktight support against the axial ejection orifice (6b) (10b).
10. Micropompe selon la revendication 9, caractérisée en ce que ladite tête (61) est logée à l'intérieur d'une cavité dont les parois transversales forment des butées de fin de course.10. Micropump according to claim 9, characterized in that said head (61) is housed inside a cavity whose transverse walls form end-of-travel stops.
11. Micropompe selon l'une des revendications 9 ou 10, caractérisée en ce que l'orifice d'alimentation (10a) est ménagé sur la paroi latérale dudit corps (1) et l'élément d'obturation du clapet d'admission est constitué d'une chemise (7) dans laquelle est engagée avec contact de friction la partie interne (2a) du piston (2).11. Micropump according to one of claims 9 or 10, characterized in that the supply orifice (10a) is formed on the side wall of said body (1) and the shutter element of the intake valve is consisting of a jacket (7) in which is engaged with friction contact the internal part (2a) of the piston (2).
12. Micropompe selon la revendication 11, caractérisée en ce que ladite chemise (7) coopère avec un epaulement annulaire (17) ménagé sur la paroi latérale interne du corps (1) pour limiter sa course. 12. Micropump according to claim 11, characterized in that said jacket (7) cooperates with an annular shoulder (17) formed on the internal lateral wall of the body (1) to limit its stroke.
EP01994873A 2000-12-12 2001-12-11 Electronic micro-pump Expired - Lifetime EP1351775B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0016127 2000-12-12
FR0016127A FR2817848B1 (en) 2000-12-12 2000-12-12 ELECTRONIC MICROPUMP
PCT/FR2001/003917 WO2002047826A1 (en) 2000-12-12 2001-12-11 Electronic micro-pump

Publications (2)

Publication Number Publication Date
EP1351775A1 true EP1351775A1 (en) 2003-10-15
EP1351775B1 EP1351775B1 (en) 2010-02-10

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EP01994873A Expired - Lifetime EP1351775B1 (en) 2000-12-12 2001-12-11 Electronic micro-pump

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US (1) US7029249B2 (en)
EP (1) EP1351775B1 (en)
JP (1) JP4166570B2 (en)
CN (1) CN1250336C (en)
AT (1) ATE457204T1 (en)
AU (1) AU2002225077A1 (en)
BR (1) BR0116512A (en)
CA (1) CA2431169A1 (en)
DE (1) DE60141293D1 (en)
FR (1) FR2817848B1 (en)
MX (1) MXPA03005210A (en)
WO (1) WO2002047826A1 (en)

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Also Published As

Publication number Publication date
ATE457204T1 (en) 2010-02-15
CA2431169A1 (en) 2002-06-20
JP2004537667A (en) 2004-12-16
CN1479653A (en) 2004-03-03
WO2002047826A1 (en) 2002-06-20
DE60141293D1 (en) 2010-03-25
AU2002225077A1 (en) 2002-06-24
US20040026461A1 (en) 2004-02-12
FR2817848B1 (en) 2003-03-07
JP4166570B2 (en) 2008-10-15
BR0116512A (en) 2004-01-06
MXPA03005210A (en) 2003-09-25
FR2817848A1 (en) 2002-06-14
US7029249B2 (en) 2006-04-18
CN1250336C (en) 2006-04-12
EP1351775B1 (en) 2010-02-10

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