EP0707894A1 - Miniature precompression pump - Google Patents

Miniature precompression pump Download PDF

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Publication number
EP0707894A1
EP0707894A1 EP95402284A EP95402284A EP0707894A1 EP 0707894 A1 EP0707894 A1 EP 0707894A1 EP 95402284 A EP95402284 A EP 95402284A EP 95402284 A EP95402284 A EP 95402284A EP 0707894 A1 EP0707894 A1 EP 0707894A1
Authority
EP
European Patent Office
Prior art keywords
valve
pump according
nozzle
seat
collar
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
EP95402284A
Other languages
German (de)
French (fr)
Other versions
EP0707894B1 (en
Inventor
Alain Behar
Marcel Eudes
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.)
Albea Le Treport SAS
Original Assignee
S O F A B SA
Sofab SA
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 S O F A B SA, Sofab SA filed Critical S O F A B SA
Priority to SI9530453T priority Critical patent/SI0707894T1/en
Publication of EP0707894A1 publication Critical patent/EP0707894A1/en
Application granted granted Critical
Publication of EP0707894B1 publication Critical patent/EP0707894B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B05B11/0064—Lift 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
    • B05B11/1001—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
    • B05B11/0005—Components or details
    • B05B11/0062—Outlet valves actuated by the pressure of the fluid to be sprayed
    • B05B11/007—Outlet valves actuated by the pressure of the fluid to be sprayed being opened by deformation of a sealing element made of resiliently deformable material, e.g. flaps, skirts, duck-bill 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
    • B05B11/1042—Components or details
    • B05B11/1061—Pump priming means

Definitions

  • the object of the invention is to reach a better compromise by reconciling smoothness and precision, based on the fact that the improvement of manufacturing techniques and in particular the precision of execution of parts allows today to return to the use of an internal valve by eliminating both its initial drawbacks and the impression of double rebound created by excessive dead travel.
  • the piston is in two parts, with on the one hand, a nozzle which has in the upper part an internal shoulder, its lower end widening on the contrary in a collar and, on the other hand part, a socket which, fitted on this collar by its upper edge, serves externally as a seal, delimiting an interior chamber where the exhaust valve is housed, its base pierced with an axial orifice serving as an annular seat for said audit valve, whose return spring, introduced with it from below, is placed inside the nozzle.
  • the seat takes the form of a bowl, the seat of which is connected by a rounded fillet to a flared belt; the valve has a fairly thin lip-shaped bell-shaped shape turned downward, of an edge having in the free state a perimeter substantially equal to or barely greater than that of the fillet and bearing at rest on the base, applied in a sealed manner on the 'seat and in the corner of the bowl under the effect of the return spring of the valve.
  • the active surface of the valve is then minimal.
  • the edge will preferably have a greater curvature than that of the said fillet.
  • the inlet valve closes: the pressure increases in the pump and first presses the lip against the belt of the bowl, strengthening its tightness; beyond a certain threshold, it tends to raise the exhaust valve, pushing its tightness towards the angle: this last effect causes an increase in the surface of this valve subjected to fairly significant pressure, due to the small dimensions of the pump, to suddenly release its return spring.
  • valve lip then allows it to widen to follow the flared wall of the bowl only over a very small distance, less than the total height of the belt; as soon as it leaves this wall, it returns almost to its initial perimeter because most of the pressure is transmitted on the emitting nozzle, and the valve tends to descend, offering to the flow of the product along the oblique belt a narrow lateral passage, the section of which varies with its residual lift; this passage is preceded by a convergent which pushes back the pressure losses, centering the exhaust valve and stabilizing both its position and the pressure available on the orifice of the nozzle.
  • valve in the enlarged chamber formed by the bushing under the nozzle collar allows it to give at rest a minimum effective section at least equal to that of the nozzle channel and raised, a maximum effective section at least double, of third party order or at least a quarter of that of the piston in the pump body, so that it becomes possible to provide the exhaust valve with a reasonably strong spring; the widening of the belt minimizes the effects that are difficult to control; the displacement of the piston necessary for the opening of the valve is approximately three times less than its own, therefore almost negligible.
  • the total height of the bowl does not have to exceed the valve lift, namely a few tenths of a millimeter, for an average flare slope close to 0.3 and preferably increasing from the fillet connection upwards to give its wall has an S-profile.
  • the small lateral space available as well as the concern to reduce dead volumes and to avoid sudden variations in the passage sections advantageously lead to placing the belt directly or almost in line with the side wall of the chamber. , also circular, to form a channel that widens slightly upwards.
  • the pump of FIG. 1 has a body 1 provided with a lower outlet provided with an intake tube 11 and controlled by an intake valve whose ball valve 12 is trapped in a cage 13 carrying internal stops 14 and of a greater range 15 with radial grooves.
  • the piston consists of a sleeve 2 assembled on a hollow rod 3 .
  • the side wall of the sleeve 2 seals on the pump body by means of two flexible lips 21 turned in direction opposite and its base 22 , pierced with an axial orifice 23 , creates on its upper face an annular surface 24 in a bowl with a flared belt.
  • the hollow rod 3 carries at its lower part a collar 30 which, in the example shown, is formed by two concentric flanges 31 and 32 which are separated by a groove where the upper edge 25 of the sleeve is fitted.
  • This rod forms a nozzle and, internally generating a shoulder 33 , its upper end narrows externally to a standardized diameter allowing it to fit a standard type pusher, not shown, usually equipped with a spray nozzle.
  • the base 22 delimits downwards inside the socket 2 , under the collar 30 , a chamber 26 which receives an exhaust valve 4 in the form of a lip bell 40 facing downwards.
  • a spring 5 compressed between two opposing bearing surfaces of the cage 13 and the sleeve 2 returns the piston upwards.
  • a flange 6 encloses the whole of this mechanism inside the pump body, allowing the nozzle 3 to pass; in the figure it is a metal cup set on the rim 16 of the body; it will then be crimped a second time, by the conditioner, its seal 61 in tight clamping on a bottle, not shown, containing the product.
  • the spring 5 presses the piston against the collar 6 ; in the current example the internal clearance left by the seal 61 and grooves 17 on the rim 16 of the body 1 provide a vent between the container and the atmosphere along the nozzle 3 ; it is the shoulder formed by the collar 30 thereof which comes to seal in abutment on a seal 62 ; any action on the pusher will open this communication to rebalance the pressure.
  • valve has two opposite axial pins which facilitate mounting.
  • the upper pin 42 reduces the dead volumes and guides the spring 41 ; at birth, a bearing 43 supports the latter, preferably grooved to also facilitate the passage of the product, it can serve as a stop.
  • the lower pin 44 comes at the end of the lower stroke of the piston, a little before the base 22 , abuts against the bearing surface 15 of the cage 13 , conventionally causing the forced opening of the valve 4 to facilitate priming at the start of use, the return of the piston to the rest position then causing product suction as soon as the spring 41 , again free, closes the exhaust .
  • FIG. 2 The structure of the exhaust valve appears better in FIG. 2 which, enlarged seventy-five times, makes it possible to understand its operation.
  • the bowl 24 draws around the orifice 23 , with a diameter of 1.6 mm, a narrow annular seat 27 that a fillet 28 of 0.2 mm radius drawing a torus 2 mm in average diameter connects to a flared belt 29 to the profile in an arc of a height of 0.4 mm; from the bottom to the top the slope of this belt increases from 0.25 to 0.7 approximately.
  • the lip 40 of the valve 4 ends in a semicircular edge of 0.15 mm radius drawing a torus of 2.1 mm in average diameter which, in the free state comes to touch the wall at the bottom of the belt, its center in the position marked A shown in solid lines.
  • the lip 40 then takes off, the valve delivering passage to the flow: given the low dead volumes, the pressure drop is immediately balanced between the orifice it has just opened and that of the spray nozzle, so that the lip tightens and that the valve descends to an equilibrium position E (shown in dotted lines) which leaves a narrow neck facing the flared belt 29 towards which the flow converges and then gradually diverges. At the end of use, it remains open at first under the effect of pin 44 and will not return to position B until the user stops his effort.
  • the path inside the bowl 24 is a cycle diagrammed in F with dotted lines.
  • FIG. 3 gives an example of an acceptable variant, in which the belt 29 has a constant slope of 0.3 and the seat 27 a conical shape increasing at rest the contact surface, compensated by an internal angle cut down on the edge of lip 40 . It leads to a slightly higher valve lift but also allows smooth operation and very frank spraying.

Abstract

The pump consists of a cylindrical body (1) with a lower intake (2) and inlet valve (12), a collar (6) to retain a spring (5) and a piston (2) with a nozzle (3) which has its outlet channel controlled by a valve (4). The nozzle has an inner shoulder (33) at its upper end, and a lower end which broadens beneath the collar, forming a cap (30) which engages with the upper end of the piston (2) to form an inner chamber (26) containing the outlet valve(4). The lower part (22) of the piston has an axial channel (23) which acts a seat for the outlet valve. The outlet valve (4) and its spring (41) are fitted into the nozzle from its lower end before the piston is fitted.

Description

De nombreux types de pompes miniatures ont été proposés pour équiper des conditionnements de produits cosmétiques ou pharmaceutiques et permettre de les distribuer commodément par doses successives. Leur encombrement est usuellement inférieur au centimètre cube.Many types of miniature pumps have been proposed to equip cosmetic or pharmaceutical packaging and allow them to be conveniently dispensed in successive doses. Their size is usually less than one cubic centimeter.

La plupart comprennent un corps cylindrique possédant une prise basse équipée d'une soupape d'admission, en particulier à bille retombant sous son propre poids, où une collerette enferme un piston mobile contre l'action d'un ressort de renvoi ; traversant cette collerette, la tige de commande creuse du piston forme un conduit d'évacuation ou gicleur à canal interne axial que ferme une soupape d'échappement tarée par un organe de rappel élastique, et recevra un poussoir portant normalement aussi la buse émettrice du produit..Most include a cylindrical body having a low grip fitted with an intake valve, in particular with a ball falling under its own weight, where a flange encloses a movable piston against the action of a return spring; passing through this flange, the hollow control rod of the piston forms a discharge duct or nozzle with an axial internal channel which closes an exhaust valve calibrated by an elastic return member, and will receive a pusher normally also carrying the nozzle emitting the product ..

Une difficulté accrue par l'extrême miniaturisation des pièces, en particulier lorsqu'on recherche une pulvérisation, est d'obtenir une émission franche et précise: les solutions les plus simples et les plus anciennes proposaient l'emploi d'une soupape d'échappement à clapet interne, placé par le haut dans la tige du piston. La faible section disponible conduisait à des ressorts de rappel très faibles et on a longtemps préféré l'emploi d'un manchon externe combinant les rôles de clapet et de garniture d'étanchéité du piston sur le corps. Pour avoir un fonctionnement plus franc ce clapet pouvait avantageusement travailler en tiroir, ne s'ouvrant qu'après une certaine course morte; mais, surpris par l'impression de double détente qui en résultait, le comportement de l'utilisateur défie quelque peu les espoirs des concepteurs.An increased difficulty by the extreme miniaturization of the parts, in particular when looking for a spray, is to obtain a frank and precise emission: the simplest and oldest solutions proposed the use of an exhaust valve. with internal valve, placed from above in the piston rod. The small section available led to very weak return springs and it has long been preferred to use an external sleeve combining the roles of valve and seal of the piston on the body. To have a more frank operation, this valve could advantageously work in a drawer, opening only after a certain dead stroke; but, surprised by the impression of double relaxation that resulted, the behavior of the user somewhat defies the hopes of the designers.

L'objet de l'invention est de parvenir à un meilleur compromis en conciliant douceur et précision, se fondant sur le fait que le perfectionnement des techniques de fabrication et notamment de la précision d'exécution des pièces permet aujourd'hui de revenir à l'emploi d'un clapet interne en supprimant à la fois ses inconvénients initiaux et l'impression de double détente créée par une course morte excessive.The object of the invention is to reach a better compromise by reconciling smoothness and precision, based on the fact that the improvement of manufacturing techniques and in particular the precision of execution of parts allows today to return to the use of an internal valve by eliminating both its initial drawbacks and the impression of double rebound created by excessive dead travel.

Selon l'invention, le piston est en deux pièces, avec d'une part, un gicleur qui possède en partie haute un épaulement interne, son extrémité inférieure s'élargissant au contraire en un collet et, d'autre part, une douille qui, emboîtée sur ce collet par son bord supérieur, sert extérieurement de garniture d'étanchéité, délimitant une chambre intérieure où le clapet d'échappement se trouve logé, son culot percé d'un orifice axial servant de siège annulaire audit clapet, dont le ressort de rappel, introduit avec lui par le bas, se place à l'intérieur du gicleur.According to the invention, the piston is in two parts, with on the one hand, a nozzle which has in the upper part an internal shoulder, its lower end widening on the contrary in a collar and, on the other hand part, a socket which, fitted on this collar by its upper edge, serves externally as a seal, delimiting an interior chamber where the exhaust valve is housed, its base pierced with an axial orifice serving as an annular seat for said audit valve, whose return spring, introduced with it from below, is placed inside the nozzle.

Le siège revêt la forme en cuvette dont l'assise se raccorde par un congé arrondi à une ceinture évasée ; le clapet possède une forme en cloche à lèvre assez mince tournée vers le bas, d'arête ayant à l'état libre un périmètre sensiblement égal ou à peine supérieur celui du congé et portant au repos sur le culot, appliquée de façon étanche sur l'assise et dans l'angle de la cuvette sous l'effet du ressort de rappel du clapet. La surface active du clapet est alors minimale. L'arête aura de préférence une courbure plus forte que celle dudit congé.The seat takes the form of a bowl, the seat of which is connected by a rounded fillet to a flared belt; the valve has a fairly thin lip-shaped bell-shaped shape turned downward, of an edge having in the free state a perimeter substantially equal to or barely greater than that of the fillet and bearing at rest on the base, applied in a sealed manner on the 'seat and in the corner of the bowl under the effect of the return spring of the valve. The active surface of the valve is then minimal. The edge will preferably have a greater curvature than that of the said fillet.

Lorsque l'opérateur agit sur le bouton poussoir, le clapet d'admission se ferme : la pression augmente dans la pompe et plaque d'abord la lèvre contre la ceinture de la cuvette, renforçant son étanchéité ; au delà d'un certain seuil, elle tend à soulever le clapet d'échappement, repoussant son étanchéité vers l'angle : ce dernier effet provoque une augmentation de la surface de ce clapet soumise à la pression assez notable, en raison des faibles dimensions de la pompe, pour faire céder brusquement son ressort de rappel.When the operator acts on the push button, the inlet valve closes: the pressure increases in the pump and first presses the lip against the belt of the bowl, strengthening its tightness; beyond a certain threshold, it tends to raise the exhaust valve, pushing its tightness towards the angle: this last effect causes an increase in the surface of this valve subjected to fairly significant pressure, due to the small dimensions of the pump, to suddenly release its return spring.

L'élasticité limitée de la lèvre du clapet ne permet alors à celle-ci de s'élargir pour suivre la paroi évasée de la cuvette que sur une distance très faible, inférieure à la hauteur totale de la ceinture ; aussitôt qu'elle quitte cette paroi, elle revient presque à son périmètre initial car la majeure partie de la pression se transmet sur la buse émettrice, et le clapet tend à redescendre, offrant à l'écoulement du produit le long de la ceinture oblique un passage latéral étroit dont la section varie avec sa levée résiduelle ; ce passage est précédé d'un convergent qui repousse en aval les pertes de charge, centrant le clapet d'échappement et stabilisant à la fois sa position et la pression disponible sur l'orifice de la buse.The limited elasticity of the valve lip then allows it to widen to follow the flared wall of the bowl only over a very small distance, less than the total height of the belt; as soon as it leaves this wall, it returns almost to its initial perimeter because most of the pressure is transmitted on the emitting nozzle, and the valve tends to descend, offering to the flow of the product along the oblique belt a narrow lateral passage, the section of which varies with its residual lift; this passage is preceded by a convergent which pushes back the pressure losses, centering the exhaust valve and stabilizing both its position and the pressure available on the orifice of the nozzle.

Le fait de placer le clapet dans la chambre élargie formée par la douille sous le collet du gicleur permet de lui donner au repos une section efficace minimale au moins égale à celle du canal du gicleur et levé, une section efficace maximale au moins double, de l'ordre du tiers ou au moins du quart de celle du piston dans le corps de pompe, de sorte qu'il devient possible de doter la soupape d'échappement d'un ressort raisonnablement fort ; l'évasement de la ceinture minimise les effets peu maîtrisables des frottements ; le déplacement du piston nécessaire à l'ouverture du clapet est environ trois fois plus faible que le sien propre donc presque négligeable.Placing the valve in the enlarged chamber formed by the bushing under the nozzle collar allows it to give at rest a minimum effective section at least equal to that of the nozzle channel and raised, a maximum effective section at least double, of third party order or at least a quarter of that of the piston in the pump body, so that it becomes possible to provide the exhaust valve with a reasonably strong spring; the widening of the belt minimizes the effects that are difficult to control; the displacement of the piston necessary for the opening of the valve is approximately three times less than its own, therefore almost negligible.

Il résulte de cette construction une souplesse de fonctionnement qui évite des réactions nuisibles de l'utilisateur et permet le cas échéant une pulvérisation très franche.The result of this construction is a flexibility of operation which avoids harmful reactions from the user and allows, if necessary, very frank spraying.

La hauteur totale de la cuvette n'a pas à dépasser la levée du clapet, à savoir quelques dixièmes de millimètre, pour une pente d'évasement moyenne proche de 0,3 et croissant de préférence du raccord du congé vers le haut pour donner à sa paroi un profil en S. Le faible encombrement latéral disponible comme le souci de réduire les volumes morts et d'éviter de brusques variations des sections de passage conduisent avantageusement à placer sa ceinture à l'aplomb ou presque de la paroi latérale de la chambre, également circulaire, pour former un canal s'évasant légèrement vers le haut.The total height of the bowl does not have to exceed the valve lift, namely a few tenths of a millimeter, for an average flare slope close to 0.3 and preferably increasing from the fillet connection upwards to give its wall has an S-profile. The small lateral space available as well as the concern to reduce dead volumes and to avoid sudden variations in the passage sections advantageously lead to placing the belt directly or almost in line with the side wall of the chamber. , also circular, to form a channel that widens slightly upwards.

D'autres caractéristiques de l'invention ressortiront de la description d'un exemple avantageux, donnée ci-dessous en référence aux dessins. Ceux-ci montrent :

  • figure 1 : une coupe d'ensemble d'une pompe selon l'invention,
  • figure 2 : un détail de la soupape d'échappement montrant les profils de son siège en cuvette et de la lèvre de son clapet.
  • figure 3 : un détail d'une variante de la soupape d'échappement.
Other characteristics of the invention will emerge from the description of an advantageous example, given below with reference to the drawings. These show:
  • FIG. 1 : an overall section of a pump according to the invention,
  • Figure 2 : a detail of the exhaust valve showing the profiles of its bowl seat and the lip of its valve.
  • Figure 3 : a detail of a variant of the exhaust valve.

La pompe de la figure 1 possède un corps 1 doté d'une prise inférieure munie d'un tube de prise 11 et commandée par une soupape d'admission dont le clapet à bille 12 est prisonnier d'une cage 13 porteuse de butées internes 14 et d'une portée supérieure 15 à saignées radiales.The pump of FIG. 1 has a body 1 provided with a lower outlet provided with an intake tube 11 and controlled by an intake valve whose ball valve 12 is trapped in a cage 13 carrying internal stops 14 and of a greater range 15 with radial grooves.

Le piston est constitué d'une douille 2 assemblée sur une tige creuse 3.The piston consists of a sleeve 2 assembled on a hollow rod 3 .

La paroi latérale de la douille 2 fait étanchéité sur le corps de pompe par l'intermédiaire de deux lèvres souples 21 tournées en sens opposés et son culot 22, percé d'un orifice axial 23, crée sur sa face supérieure une portée annulaire 24 en cuvette à ceinture évasée.The side wall of the sleeve 2 seals on the pump body by means of two flexible lips 21 turned in direction opposite and its base 22 , pierced with an axial orifice 23 , creates on its upper face an annular surface 24 in a bowl with a flared belt.

La tige creuse 3 porte à sa partie inférieure un collet 30 qui, dans l'exemple représenté, est formé de deux brides concentriques 31 et 32 que sépare une saignée où le bord supérieur 25 de la douille vient s'emboîter. Cette tige forme gicleur et, engendrant intérieurement un épaulement 33, son extrémité supérieure se rétrécit extérieurement à un diamètre normalisé permettant d'y emboîter un poussoir de type courant, non représenté, usuellement équipé d'une buse pulvérisatrice.The hollow rod 3 carries at its lower part a collar 30 which, in the example shown, is formed by two concentric flanges 31 and 32 which are separated by a groove where the upper edge 25 of the sleeve is fitted. This rod forms a nozzle and, internally generating a shoulder 33 , its upper end narrows externally to a standardized diameter allowing it to fit a standard type pusher, not shown, usually equipped with a spray nozzle.

Le culot 22 délimite vers le bas à l'intérieur de la douille 2, sous le collet 30, une chambre 26 qui reçoit un clapet d'échappement 4 en forme de cloche à lèvre 40 tournée vers le bas. Un ressort de rappel 41 placé dans le canal interne de la tige ou gicleur 3 en appui sur son épaulement 33 applique la cloche 40 sur le fond de la cuvette 24 située sur la face supérieure du culot 22.The base 22 delimits downwards inside the socket 2 , under the collar 30 , a chamber 26 which receives an exhaust valve 4 in the form of a lip bell 40 facing downwards. A return spring 41 placed in the internal channel of the rod or nozzle 3 resting on its shoulder 33 applies the bell 40 to the bottom of the bowl 24 located on the upper face of the base 22.

Un ressort 5, comprimé entre deux portées antagonistes de la cage 13 et de la douille 2 renvoie le piston vers le haut. Une collerette 6 enferme l'ensemble de ce mécanisme à l'intérieur du corps de pompe, laissant passer le gicleur 3 ; sur la figure il s'agit d'une coupelle métallique sertie sur le rebord 16 du corps ; elle sera ensuite sertie une seconde fois, par le conditionneur, son joint 61 en serrage étanche sur un flacon, non représenté, contenant le produit.A spring 5 , compressed between two opposing bearing surfaces of the cage 13 and the sleeve 2 returns the piston upwards. A flange 6 encloses the whole of this mechanism inside the pump body, allowing the nozzle 3 to pass; in the figure it is a metal cup set on the rim 16 of the body; it will then be crimped a second time, by the conditioner, its seal 61 in tight clamping on a bottle, not shown, containing the product.

Le ressort 5 plaque le piston contre la collerette 6 ; dans l'exemple actuel le jeu interne laissé par le joint 61 et des saignées 17 sur le rebord 16 du corps 1 ménagent un évent entre le récipient et l'atmosphère le long du gicleur 3 ; c'est l'épaulement formé par le collet 30 de celui-ci qui vient faire étanchéité en butée sur un joint 62 ; toute action sur le poussoir ouvrira cette communication pour rééquilibrer la pression.The spring 5 presses the piston against the collar 6 ; in the current example the internal clearance left by the seal 61 and grooves 17 on the rim 16 of the body 1 provide a vent between the container and the atmosphere along the nozzle 3 ; it is the shoulder formed by the collar 30 thereof which comes to seal in abutment on a seal 62 ; any action on the pusher will open this communication to rebalance the pressure.

On notera que le clapet possède deux broches axiales opposées qui facilitent le montage.Note that the valve has two opposite axial pins which facilitate mounting.

La broche supérieure 42 réduit les volumes morts et guide le ressort 41 ; à sa naissance, une portée 43 supporte ce dernier, de préférence rainurée pour faciliter aussi le passage du produit, elle peut servir de butée. La broche inférieure 44 vient en fin de course basse du piston, un peu avant le culot 22, buter contre la portée 15 de la cage 13, provoquant de façon classique l'ouverture forcée du clapet 4 pour faciliter l'amorçage en début d'utilisation, le retour du piston en position de repos provoquant ensuite une aspiration de produit dès que le ressort 41, à nouveau libre, referme l'échappement.The upper pin 42 reduces the dead volumes and guides the spring 41 ; at birth, a bearing 43 supports the latter, preferably grooved to also facilitate the passage of the product, it can serve as a stop. The lower pin 44 comes at the end of the lower stroke of the piston, a little before the base 22 , abuts against the bearing surface 15 of the cage 13 , conventionally causing the forced opening of the valve 4 to facilitate priming at the start of use, the return of the piston to the rest position then causing product suction as soon as the spring 41 , again free, closes the exhaust .

La structure de la soupape d'échappement apparaît mieux sur la figure 2 qui, agrandie soixante-quinze fois, permet d'en comprendre le fonctionnement.The structure of the exhaust valve appears better in FIG. 2 which, enlarged seventy-five times, makes it possible to understand its operation.

Sur le culot 22 de la douille 2, la cuvette 24 dessine autour de l'orifice 23, d'un diamètre de 1,6 mm, une étroite assise annulaire 27 qu'un congé 28 de 0,2 mm de rayon dessinant un tore de 2 mm de diamètre moyen raccorde à une ceinture évasée 29 au profil en arc de cercle d'une hauteur de 0,4 mm ; du bas vers le haut la pente de cette ceinture croît de 0,25 à 0,7 environ. La lèvre 40 du clapet 4 se termine par une arête en demi-cercle de 0,15 mm de rayon dessinant un tore de 2,1 mm de diamètre moyen qui, à l'état libre vient toucher la paroi au bas de la ceinture, son centre dans la position repérée A représentée en traits pleins. Clapet au repos sur le siège formé par la cuvette, cette lèvre s'écrase dans une position basse, schématisée en B (en traits interrompus longs fins), avec un léger serrage dans l'angle de la cuvette. Lorsque la pompe est mise en action, l'augmentation de la pression sous le clapet la plaque en appui sur la paroi latérale, dans une position C (représentée en traits interrompus longs forts), légèrement décalée vers l'extérieur.On the base 22 of the socket 2 , the bowl 24 draws around the orifice 23 , with a diameter of 1.6 mm, a narrow annular seat 27 that a fillet 28 of 0.2 mm radius drawing a torus 2 mm in average diameter connects to a flared belt 29 to the profile in an arc of a height of 0.4 mm; from the bottom to the top the slope of this belt increases from 0.25 to 0.7 approximately. The lip 40 of the valve 4 ends in a semicircular edge of 0.15 mm radius drawing a torus of 2.1 mm in average diameter which, in the free state comes to touch the wall at the bottom of the belt, its center in the position marked A shown in solid lines. Flap at rest on the seat formed by the bowl, this lip is crushed in a low position, shown schematically at B (in long dashed lines), with a slight tightening in the angle of the bowl. When the pump is put into action, the increase in pressure under the valve the plate rests on the side wall, in a position C (shown in strong long dashed lines), slightly offset towards the outside.

Quand le ressort de rappel du clapet commence à céder, le produit s'infiltre rapidement sous la lèvre, l'étanchéité ne subsistant qu'à hauteur de la ceinture : il en résulte que l'effort sur le ressort double et que la résistance de celui-ci s'effondre entièrement. La lèvre 40 remonte aussitôt le long de la paroi mais son élasticité ne lui permet pas de la suivre au delà d'une position D (représentée en traits mixtes), sa course n'atteint alors pas 0,4 mm ce qui, négligeant les effets de l'élasticité, correspond à une course de piston de l'ordre de 0,1mm seulement.When the valve return spring begins to fail, the product quickly infiltrates under the lip, the seal only remaining at waist level: the result is that the force on the spring doubles and that the resistance of it collapses entirely. The lip 40 rises immediately along the wall but its elasticity does not allow it to follow it beyond a position D (shown in phantom), its stroke then does not reach 0.4 mm which, neglecting the effects of elasticity, corresponds to a piston stroke of the order of only 0.1mm.

La lèvre 40 décolle alors, la soupape livrant passage à l'écoulement : étant donné la faiblesse des volumes morts la chute de pression s'équilibre aussitôt entre l'orifice qu'elle vient d'ouvrir et celui de la buse pulvérisatrice, de sorte que la lèvre se resserre et que le clapet redescend jusqu'à une position d'équilibre E (représentée en pointillés) qui laisse en regard de la ceinture évasée 29 un col étroit vers lequel l'écoulement converge pour ensuite diverger progressivement. En fin d'utilisation elle reste d'abord ouverte sous l'effet de la broche 44 et ne reviendra en position B que lorsque l'utilisateur interrompra son effort. Le trajet à l'intérieur de la cuvette 24 est un cycle schématisé en F avec des pointillés.The lip 40 then takes off, the valve delivering passage to the flow: given the low dead volumes, the pressure drop is immediately balanced between the orifice it has just opened and that of the spray nozzle, so that the lip tightens and that the valve descends to an equilibrium position E (shown in dotted lines) which leaves a narrow neck facing the flared belt 29 towards which the flow converges and then gradually diverges. At the end of use, it remains open at first under the effect of pin 44 and will not return to position B until the user stops his effort. The path inside the bowl 24 is a cycle diagrammed in F with dotted lines.

La figure 3 donne un exemple de variante acceptable, dans lequel la ceinture 29 a une pente constante de 0,3 et l'assise 27 une forme conique accroissant au repos la surface de contact, compensée par un angle intérieur abattu sur l'arête de la lèvre 40. Elle conduit à une levée de soupape un peu supérieure mais permet aussi un fonctionnement doux et une pulvérisation très franche. FIG. 3 gives an example of an acceptable variant, in which the belt 29 has a constant slope of 0.3 and the seat 27 a conical shape increasing at rest the contact surface, compensated by an internal angle cut down on the edge of lip 40 . It leads to a slightly higher valve lift but also allows smooth operation and very frank spraying.

Claims (9)

Pompe miniature comprenant un corps cylindrique (1) à prise basse équipée d'une soupape d'admission (12), où une collerette (6) enferme contre l'action d'un ressort de renvoi (5) un piston mobile muni d'un gicleur traversant la collerette, à canal axial fermé par une soupape d'échappement à clapet interne (4), tarée par un ressort (41), caractérisée en ce que le gicleur (3) possède en partie haute un épaulement interne (33), son extrémité inférieure s'élargissant au contraire sous la collerette en un collet (30) sur lequel s'emboîte par son bord supérieur (25) une douille (2) qui sert extérieurement de garniture d'étanchéité du piston, délimitant sous le collet du gicleur une chambre intérieure (26) où le clapet d'échappement se trouve logé, son culot (22) percé d'un orifice axial (23) servant de siège annulaire audit clapet dont le ressort de rappel (41), introduit avec lui par le bas, se place à l'intérieur du gicleur.Miniature pump comprising a cylindrical body (1) with low intake fitted with an intake valve (12) , where a flange (6) encloses against the action of a return spring (5) a movable piston provided with a nozzle passing through the collar, with an axial channel closed by an exhaust valve with internal valve (4) , calibrated by a spring (41), characterized in that the nozzle (3) has an internal shoulder (33) in the upper part , its lower end widening on the contrary under the collar into a collar (30) on which fits by its upper edge (25) a sleeve (2) which serves externally as a seal for the piston, delimiting under the collar an internal chamber (26) in which the exhaust valve is housed, its base (22) pierced with an axial orifice (23) serving as an annular seat to said valve, the return spring (41) of which is introduced with it from below, fits inside the nozzle. Pompe selon la revendication 1, caractérisée en ce que le clapet d'échappement (4) possède une section efficace minimale au moins égale à celle du canal du gicleur (3) et maximale au moins double.Pump according to claim 1 , characterized in that the exhaust valve (4) has a minimum cross section at least equal to that of the nozzle channel (3) and maximum at least double. Pompe selon la revendication 2, caractérisée en ce que le clapet possède une section efficace maximale au moins égale au quart de celle du piston dans le corps de pompe.Pump according to claim 2 , characterized in that the valve has a maximum cross section at least equal to a quarter of that of the piston in the pump body. Pompe selon la revendication 1, caractérisée en ce que le siège revêt la forme en cuvette (24) dont l'assise (27) se raccorde par un congé arrondi (28) à une ceinture évasée (29), le clapet possèdant une forme de cloche à lèvre assez mince (40) tournée vers le bas, de périmètre à l'état libre sensiblement égal ou à peine supérieur à celui du congé, qui porte au repos sur le culot (22), appliquée de façon étanche sur l'assise et dans l'angle de la cuvette sous l'effet du ressort de rappel du clapet.Pump according to claim 1 , characterized in that the seat takes the form of a bowl (24) , the seat (27) of which is connected by a rounded fillet (28) to a flared belt (29) , the valve having a form of fairly thin lip bell (40) turned downwards, with a perimeter in the free state substantially equal to or barely greater than that of the fillet, which bears at rest on the base (22), applied tightly to the seat and in the angle of the bowl under the effect of the valve return spring. Pompe selon la revendication 4, caractérisée en ce que l'élasticité de la lèvre ne permet à celle-ci de suivre la paroi évasée de la ceinture (29) que sur une distance inférieure à la hauteur totale de celle-ci.Pump according to claim 4 , characterized in that the elasticity of the lip allows the latter to follow the flared wall of the belt (29) only over a distance less than the total height of the latter. Pompe selon la revendication 5, caractérisée en ce que la cuvette (24) a une hauteur de quelques dixièmes de millimètre pour une pente d'évasement moyenne de sa ceinture proche de 0,3.Pump according to claim 5 , characterized in that the bowl (24) has a height of a few tenths of a millimeter for an average flare slope of its belt close to 0.3. Pompe selon la revendication 6, caractérisée en ce que la pente de la ceinture (29) croît du raccord du congé (28) vers le haut, pour donner à sa paroi un profil en S.Pump according to claim 6 , characterized in that the slope of the belt (29) increases from the fillet connection (28) upwards, to give its wall an S-profile. Pompe selon la revendication 6, caractérisée en ce que l'arête de la lèvre (40) a une courbure plus forte que celle dudit congé (28).Pump according to claim 6 , characterized in that the edge of the lip (40) has a greater curvature than that of said fillet (28) . Pompe selon la revendication 8, caractérisée en ce que l'assise (27) de la cuvette possède une forme conique.Pump according to claim 8 , characterized in that the seat (27) of the bowl has a conical shape.
EP95402284A 1994-10-19 1995-10-13 Miniature precompression pump Expired - Lifetime EP0707894B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9530453T SI0707894T1 (en) 1994-10-19 1995-10-13 Miniature precompression pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9412460 1994-10-19
FR9412460A FR2726045B1 (en) 1994-10-19 1994-10-19 MINIATURE PREPRESSURE PUMP

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EP0707894A1 true EP0707894A1 (en) 1996-04-24
EP0707894B1 EP0707894B1 (en) 2000-08-16

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US (1) US5671874A (en)
EP (1) EP0707894B1 (en)
AT (1) ATE195440T1 (en)
CA (1) CA2160826C (en)
DE (1) DE69518379T2 (en)
DK (1) DK0707894T3 (en)
ES (1) ES2151035T3 (en)
FR (1) FR2726045B1 (en)
PT (1) PT707894E (en)
SI (1) SI0707894T1 (en)

Cited By (2)

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WO1998011995A1 (en) * 1996-09-20 1998-03-26 Fritz Meckenstock Outlet valve, especially for a hand pump, and the pump
WO1999015425A1 (en) * 1997-09-23 1999-04-01 Josef Wischerath Gmbh & Co. Kg Dispenser pump, dispenser and modular dispenser construction

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US6170713B1 (en) * 1998-10-28 2001-01-09 Emson, Inc. Double spring precompression pump with priming feature
FR2806330B1 (en) * 2000-03-20 2002-10-25 Valois Sa VALVE DISPENSING DEVICE FORMED BY A DIFFERENTIAL PISTON
FR2838784B1 (en) * 2002-04-17 2004-07-09 Valois Sa FLUID PRODUCT DISPENSING PUMP
FR2840890B1 (en) * 2002-06-14 2004-10-15 Valois Sa FIXING MEMBER AND FLUID PRODUCT DISPENSER COMPRISING SUCH A FIXING MEMBER
FR2878002B1 (en) * 2004-11-16 2011-01-21 Valois Sas FLUID PRODUCT DELIVERY PUMP AND DISPENSER HAVING SUCH A DELIVERY PUMP.
US8986253B2 (en) 2008-01-25 2015-03-24 Tandem Diabetes Care, Inc. Two chamber pumps and related methods
US8408421B2 (en) 2008-09-16 2013-04-02 Tandem Diabetes Care, Inc. Flow regulating stopcocks and related methods
US8650937B2 (en) 2008-09-19 2014-02-18 Tandem Diabetes Care, Inc. Solute concentration measurement device and related methods
EP2724739B1 (en) 2009-07-30 2015-07-01 Tandem Diabetes Care, Inc. Portable infusion pump system
DE102010045059A1 (en) 2010-09-10 2012-03-15 F. Holzer Gmbh metering
DE102010048986A1 (en) * 2010-10-20 2012-04-26 Ursapharm Arzneimittel Gmbh metering
KR101233080B1 (en) * 2011-09-20 2013-02-14 (주)연우 Spray pump
US9180242B2 (en) 2012-05-17 2015-11-10 Tandem Diabetes Care, Inc. Methods and devices for multiple fluid transfer
US9173998B2 (en) 2013-03-14 2015-11-03 Tandem Diabetes Care, Inc. System and method for detecting occlusions in an infusion pump
CN106837774B (en) * 2016-12-26 2019-05-14 卢小平 A kind of micro-piston pump

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US4154374A (en) * 1977-10-03 1979-05-15 Ethyl Products Company Finger operated spray pump
EP0536617A1 (en) * 1991-10-11 1993-04-14 EXO S.r.l. Manually operated pump for dispensing liquid or creamy substances at a predetermined constant pressure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998011995A1 (en) * 1996-09-20 1998-03-26 Fritz Meckenstock Outlet valve, especially for a hand pump, and the pump
WO1999015425A1 (en) * 1997-09-23 1999-04-01 Josef Wischerath Gmbh & Co. Kg Dispenser pump, dispenser and modular dispenser construction
US6371333B2 (en) 1997-09-23 2002-04-16 Josef Wischerath Gmbh & Co. Kg Dispensing pump, dispenser and dispenser unit-assembly

Also Published As

Publication number Publication date
DE69518379T2 (en) 2001-03-15
DE69518379D1 (en) 2000-09-21
DK0707894T3 (en) 2001-01-02
SI0707894T1 (en) 2001-02-28
CA2160826A1 (en) 1996-04-20
PT707894E (en) 2001-02-28
CA2160826C (en) 2008-03-11
ES2151035T3 (en) 2000-12-16
FR2726045A1 (en) 1996-04-26
EP0707894B1 (en) 2000-08-16
US5671874A (en) 1997-09-30
FR2726045B1 (en) 1997-01-10
ATE195440T1 (en) 2000-09-15

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