EP0569262A1 - Volumetric pump - Google Patents
Volumetric pump Download PDFInfo
- Publication number
- EP0569262A1 EP0569262A1 EP93400864A EP93400864A EP0569262A1 EP 0569262 A1 EP0569262 A1 EP 0569262A1 EP 93400864 A EP93400864 A EP 93400864A EP 93400864 A EP93400864 A EP 93400864A EP 0569262 A1 EP0569262 A1 EP 0569262A1
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- EP
- European Patent Office
- Prior art keywords
- piston
- pumping
- orifice
- operating rod
- closing
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/12—Valves; Arrangement of valves arranged in or on pistons
- F04B53/122—Valves; Arrangement of valves arranged in or on pistons the piston being free-floating, e.g. the valve being formed between the actuating rod and the piston
Definitions
- the present invention relates to a positive displacement pump intended in particular to equip a machine for metering a heterogeneous liquid or viscous product.
- Numerous positive displacement pumps are known in which the product to be dosed is in contact with one of the sides of a piston mounted mobile in a cylindrical pumping chamber, the pump being equipped at one end with an opening which is alternately connected to a pipe. supply and a distribution pipe, or an intake opening and a distribution opening which are alternately open and closed.
- the second side of the piston is in contact with the ambient environment and the risks of contamination of the product handled are significant.
- Volumetric pumps are also known comprising an inlet opening at one end of the pumping chamber and a dispensing opening at an opposite end, the piston then being traversed by a pumping opening which is alternately open and closed by means of a non-return valve.
- the product to be packaged is then in contact with the two faces of the piston so that the risks of contamination only appear at the level of the piston operating rod and are relatively easy to resolve.
- a non-return valve which is not accessible without dismantling the pump makes cleaning and sterilization operations of the pump complex.
- the pump can only operate for liquids without particles and without pieces because these would block the valve in the open position.
- An object of the invention is to provide a positive displacement pump having a low risk of contamination of the packaged product and which can be easily cleaned and sterilized.
- a positive displacement pump comprising a housing delimiting a cylindrical pumping chamber having a longitudinal axis and comprising a supply orifice and a distribution orifice at opposite ends, a piston pierced with a pumping orifice and associated with an operating rod for sliding in an alternating movement in the pumping chamber between the supply orifice and the dispensing orifice, and a device for closing the pumping orifice , in which the device for closing the pumping opening comprises a closing member mounted to pivot about an axis adjacent to the pumping opening and comprising a substantially planar closing surface facing the piston, and a maneuver connected to the closure member and extending outside the housing to ensure pivoting of the closure member between a position where the closure face of the closure member is applied to the pumping orifice and covers it in leaktight fashion, and a position where the closing face is released from the pumping orifice.
- the pumping orifice is alternately open and closed by acting on the operating member of the closing member so that the product is packaged while benefiting from the advantages of contact of the product with the two faces of the piston and, for cleaning, the pumping orifice is kept open so that cleaning and sterilization liquid can be sent with a high flow rate through the pump to ensure complete cleaning of the latter without any disassembly.
- the piston operating rod is mounted to pivot around a pivot axis parallel to the longitudinal axis of the pumping chamber, and the closing member and the operating member of the closing device of the pumping orifice are fixed in rotation to the piston operating rod.
- the piston operating rod not only serves to control the alternating movements of the piston in the pumping chamber by a sliding movement in the longitudinal direction of the operating rod, but also to operate the closing member by a pivoting of the piston operating rod around its longitudinal axis.
- the piston operating rod is eccentric relative to the piston.
- the rotation of the piston is prevented from rotating on itself without it being necessary to provide a particular member for this purpose.
- the piston operating rod is mounted to slide axially on a pivoting lug, and the closure member is rigidly fixed to the operating rod and is kept applied to the piston by a elastic support member supported by the piston.
- the elastic member has a stop and the closure member has a cavity having a sufficient depth to allow movement of the piston relative to the closure member in an axial direction of the operating rod when the cavity the closure member is opposite the elastic support member.
- closure member is normally applied in a sealed manner to the surface facing the piston, but when the cavity of the closure member is opposite the elastic support member, the latter abuts and the axial movement to which the piston can be subjected relative to the closing member then makes it possible to space the closing member of the piston and to ensure a cleaning and sterilization of the closure member on all of its faces.
- the positive displacement pump comprises a housing 1 delimiting a cylindrical pumping chamber 2 having a longitudinal axis 3 and comprising a supply orifice 4 and a distribution orifice 5 at opposite ends.
- a piston 6 pierced with a pumping orifice 7 is arranged to slide in an alternating movement in the pumping chamber 2 between the supply orifice 4 and the dispensing orifice 5.
- the position of the piston 6 is controlled by an operating rod 8, the lower end of which is mounted to pivot on a pivoting pin 9 fixed on the upper face of the piston 6 eccentrically with respect thereto.
- a closing member 10, in the form of a pallet in the illustrated embodiment, is integral with the rod operation 8.
- the closure member 10 comprises a substantially planar lower closure face 11 facing the piston 6 and kept applied against the upper face of the piston 6 by a support member 12 in the form of a stud comprising a flange so biased elastic by a spring 13 to bear on the closure member 10.
- the support member 12 is carried by a bracket 14 fixed to the piston 6.
- the closure member 10 has on its face opposite the support member 12, a cavity 15, here a groove whose bottom forms an inclined ramp towards the edge of the closure member 10, which comes opposite the support member 12 when the closure 10 is pivoted according to a movement which will be explained in more detail below.
- the operating rod 8 passes through the housing 1 passing through a guide ring 16.
- the guide ring 16 comprises, as illustrated in FIG. 1 , seals 17 delimiting an annular chamber 18 swept by steam or sterile water sent into the annular chamber 18 by supply and discharge conduits 19.
- the operating rod 18 comprises a grooved part 20 on which is engaged an operating member 21 comprising complementary grooves for driving the operating rod 8 according to a pivoting around the pivoting pin 9 when the member 21 is moved by a control member such as a pneumatic cylinder (not shown).
- a control member such as a pneumatic cylinder (not shown).
- the operating rod 8 is associated with a control member (not shown) such as a pneumatic cylinder to move it along its longitudinal axis in an alternating movement intended to move the piston 6 alternately in the cylindrical pumping chamber 2.
- the operation of the pump according to the invention is as follows: the piston 6 having been brought into the high position as illustrated in FIG. 1 by an appropriate longitudinal displacement of the operating rod 8, the operating member 21 is controlled so that the closing member 10 comes to cover the pumping orifice 7 as illustrated in solid lines in FIG. 2.
- the operating rod 8 is then controlled to lower the piston 6 so that the product to be conditioned is sucked up by the supply orifice 4 until the piston 6 is in the low position illustrated in thin dashed line in FIG. 1.
- the operating member 21 is then controlled to pivot the closing member 10 as illustrated in line mixed end in FIG. 2 so as to release the pumping orifice 7.
- the operating rod 8 is controlled to raise the piston 6 and the product to be conditioned passes through the pumping orifice 7 to come below the piston 6 of so that at the stroke of the pump according to a determined quantity of product corresponding to the volume swept by the piston is pushed through the dispensing orifice 5.
- the pump is operated several times at start-up to fill the lower part of the housing 1 and the distribution pipe not shown.
- usual means such as controlled valves are provided on the supply and distribution lines of the pump to avoid displacement of the product to be packaged in the opposite direction to that desired.
- the piston 6 When it is desired to clean, and if necessary sterilize the pump, the piston 6 is brought into an extreme lower position in a part 23 of the housing 1 having a diameter greater than the diameter of the piston 6. This position is illustrated in FIG. 3. Simultaneously, the closure member 10 is pivoted until the cavity 15 of the closure member 10 is opposite the support member 12 as illustrated in FIG. 4. The support member 12 come then in contact with a stop 24 formed by the lower wing of the bracket 14 so that the distance between the lower end of the support member and the upper face of the piston is greater than the thickness of the piston at the level from the cavity 15. Cleaning and sterilization product is sent through the inlet port 4 and flows through the pumping port 7 and all around the piston 6.
- the pressure of the cleaning liquid also ensures downward offset of the piston 6 relative to the closure member 10 until the lower end of the support member 12 is in contact with the bottom of the groove 15 as illustrated in FIG. 3.
- the lower face 11 of the closure member 10 is then spaced from the upper face of the piston 6, which allows the passage of the cleaning product between the closure member 10 and the upper face of the piston 6.
- the pump is located thus completely subject to the flow of cleaning liquid if it is necessary to disassemble.
- FIG. 5 illustrates an alternative embodiment in which the operating rod 8 comprises a shoulder 25 bearing on the upper end of a bushing 26 integral with the piston 6.
- the closing member 10 is this time placed below the piston 6 and is driven by the operating rod 8 by means of a square section portion 27 on which the closure member 10 is held by a nut 28.
- the closure member 10 does not is therefore not susceptible to axial movement relative to the piston 6 and to ensure proper cleaning of the closing face 11 of the closing member 10 opposite the piston 6, the piston 6 has an extra thickness zone 29 surrounding the pumping orifice and the pivot axis of the operating rod 8.
- the closing member 10 ensures a tight closure from the orifice pumping 7.
- Au on the contrary, when the closure member 10 is offset from the pumping orifice 7, it is simultaneously offset from the additional thickness 29 so that, during cleaning, cleaning product can circulate between the closure face 11 and the underside of piston 6.
- the operating rod 8 of the piston 6 serves simultaneously to rotate the closing member 10, it is possible to produce a pump comprising a separate operating rod for the closing member 10 .
- an oversized zone 29 is shown extending continuously between the pumping orifice 7 and the pivot axis of the operating rod 8. It is of course possible to provide two separate extra thickness zones forming a rim of the same thickness around the operating rod 8 and the pumping orifice 7 in order to minimize the friction of the closure member 10 on the face of the piston 6.
- the pump according to the invention can be produced with a pumping chamber of non-circular section, for example oval or elliptical. In this case there is no longer any risk of turning the piston on itself around the longitudinal axis of the pumping chamber and the operating rod 8 can therefore be arranged along the axis of the pumping chamber. .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
Description
La présente invention concerne une pompe volumétrique destinée en particulier à équiper une machine de dosage de produit liquide ou visqueux hétérogène.The present invention relates to a positive displacement pump intended in particular to equip a machine for metering a heterogeneous liquid or viscous product.
On connaît de nombreuses pompes volumétriques dans lesquelles le produit à doser est en contact avec un des côtés d'un piston monté mobile dans une chambre de pompage cylindrique, la pompe étant équipée à une extrémité d'une ouverture qui est alternativement reliée à une canalisation d'alimentation et une canalisation de distribution, ou d'une ouverture d'admission et d'une ouverture de distribution qui sont ouvertes et fermées en alternance.Numerous positive displacement pumps are known in which the product to be dosed is in contact with one of the sides of a piston mounted mobile in a cylindrical pumping chamber, the pump being equipped at one end with an opening which is alternately connected to a pipe. supply and a distribution pipe, or an intake opening and a distribution opening which are alternately open and closed.
Dans les pompes de ce type, le second côté du piston est en contact avec le milieu ambiant et les risques de contamination du produit manutentionné sont importants. Pour pallier cet inconvénient, il est nécessaire de prévoir un produit bactéricide ou de l'eau stérile sur le côté du piston en contact avec le milieu ambiant, ce qui implique une structure relativement complexe de la pompe en particulier au niveau du joint d'étanchéité du piston afin d'éviter que le produit bactéricide ou l'eau stérile ne passe pas du côté du piston en contact avec le produit à doser.In pumps of this type, the second side of the piston is in contact with the ambient environment and the risks of contamination of the product handled are significant. To overcome this drawback, it is necessary to provide a bactericidal product or sterile water on the side of the piston in contact with the ambient medium, which implies a relatively complex structure of the pump, in particular at the seal. of the piston to prevent the bactericidal product or sterile water from passing on the side of the piston in contact with the product to be dosed.
On connaît également des pompes volumétriques comportant une ouverture d'admission à une extrémité de la chambre de pompage et une ouverture de distribution à une extrémité opposée, le piston étant alors traversé par une ouverture de pompage qui est alternativement ouverte et fermée au moyen d'un clapet anti-retour. Le produit à conditionner est alors en contact avec les deux faces du piston de sorte que les risques de contamination n'apparaissent qu'au niveau de la tige de manoeuvre du piston et sont relativement aisés à résoudre. Toutefois, la présence d'un clapet anti-retour qui n'est pas accessible sans démontage de la pompe rend complexe les opérations de nettoyage et de stérilisation de la pompe. De plus, en raison du clapet anti-retour la pompe ne peut fonctionner que pour des liquides sans particules et sans morceaux car ceux-ci viendraient bloquer le clapet en position ouverte.Volumetric pumps are also known comprising an inlet opening at one end of the pumping chamber and a dispensing opening at an opposite end, the piston then being traversed by a pumping opening which is alternately open and closed by means of a non-return valve. The product to be packaged is then in contact with the two faces of the piston so that the risks of contamination only appear at the level of the piston operating rod and are relatively easy to resolve. However, the presence of a non-return valve which is not accessible without dismantling the pump makes cleaning and sterilization operations of the pump complex. In addition, due to the non-return valve the pump can only operate for liquids without particles and without pieces because these would block the valve in the open position.
Un but de l'invention est de proposer une pompe volumétrique présentant un faible risque de contamination du produit conditionné et pouvant être aisément nettoyée et stérilisée.An object of the invention is to provide a positive displacement pump having a low risk of contamination of the packaged product and which can be easily cleaned and sterilized.
En vue de la réalisation de ce but, on prévoit selon l'invention une pompe volumétrique comportant un boîtier délimitant une chambre de pompage cylindrique ayant un axe longitudinal et comportant un orifice d'alimentation et un orifice de distribution à des extrémités opposées, un piston percé d'un orifice de pompage et associé à une tige de manoeuvre pour coulisser selon un mouvement alterné dans la chambre de pompage entre l'orifice d'alimentation et l'orifice de distribution, et un dispositif de fermeture de l'orifice de pompage, dans laquelle le dispositif de fermeture de l'orifice de pompage comporte un organe de fermeture monté pour pivoter autour d'un axe adjacent à l'orifice de pompage et comprenant une surface de fermeture sensiblement plane tournée vers le piston, et un organe de manoeuvre relié à l'organe de fermeture et s'étendant à l'extérieur du boîtier pour assurer un pivotement de l'organe de fermeture entre une position où la face de fermeture de l'organe de fermeture est appliquée sur l'orifice de pompage et recouvre celui-ci de façon étanche, et une position où la face de fermeture est dégagée de l'orifice de pompage.In order to achieve this goal, there is provided according to the invention a positive displacement pump comprising a housing delimiting a cylindrical pumping chamber having a longitudinal axis and comprising a supply orifice and a distribution orifice at opposite ends, a piston pierced with a pumping orifice and associated with an operating rod for sliding in an alternating movement in the pumping chamber between the supply orifice and the dispensing orifice, and a device for closing the pumping orifice , in which the device for closing the pumping opening comprises a closing member mounted to pivot about an axis adjacent to the pumping opening and comprising a substantially planar closing surface facing the piston, and a maneuver connected to the closure member and extending outside the housing to ensure pivoting of the closure member between a position where the closure face of the closure member is applied to the pumping orifice and covers it in leaktight fashion, and a position where the closing face is released from the pumping orifice.
Ainsi, pendant le pompage, l'orifice de pompage est alternativement ouvert et fermé en agissant sur l'organe de manoeuvre de l'organe de fermeture de sorte que le produit est conditionné en bénéficiant des avantages du contact du produit avec les deux faces du piston et, pour le nettoyage, l'orifice de pompage est maintenu ouvert de sorte que du liquide de nettoyage et de stérilisation peut être envoyé avec un fort débit à travers la pompe pour assurer un nettoyage complet de celle-ci sans aucun démontage.Thus, during pumping, the pumping orifice is alternately open and closed by acting on the operating member of the closing member so that the product is packaged while benefiting from the advantages of contact of the product with the two faces of the piston and, for cleaning, the pumping orifice is kept open so that cleaning and sterilization liquid can be sent with a high flow rate through the pump to ensure complete cleaning of the latter without any disassembly.
Selon une version avantageuse de l'invention, la tige de manoeuvre du piston est montée pour pivoter autour d'un axe de pivotement parallèle à l'axe longitudinal de la chambre de pompage, et l'organe de fermeture et l'organe de manoeuvre du dispositif de fermeture de l'orifice de pompage sont fixés en rotation à la tige de manoeuvre du piston. Ainsi, la tige de manoeuvre du piston sert non seulement à commander les mouvements alternés du piston dans la chambre de pompage par un mouvement de coulissement selon la direction longitudinale de la tige de manoeuvre, mais également à la manoeuvre de l'organe de fermeture par un pivotement de la tige de manoeuvre du piston autour de son axe longitudinal.According to an advantageous version of the invention, the piston operating rod is mounted to pivot around a pivot axis parallel to the longitudinal axis of the pumping chamber, and the closing member and the operating member of the closing device of the pumping orifice are fixed in rotation to the piston operating rod. Thus, the piston operating rod not only serves to control the alternating movements of the piston in the pumping chamber by a sliding movement in the longitudinal direction of the operating rod, but also to operate the closing member by a pivoting of the piston operating rod around its longitudinal axis.
De préférence, la tige de manoeuvre du piston est excentrée par rapport au piston. Ainsi, lors du pivotement de la tige de manoeuvre du piston on évite une rotation du piston sur lui-même sans qu'il soit nécessaire de prévoir un organe particulier à cet effet.Preferably, the piston operating rod is eccentric relative to the piston. Thus, during the pivoting of the piston operating rod, the rotation of the piston is prevented from rotating on itself without it being necessary to provide a particular member for this purpose.
Selon un autre aspect avantageux de l'invention, la tige de manoeuvre du piston est montée pour coulisser axialement sur un ergot de pivotement, et l'organe de fermeture est fixé rigidement à la tige de manoeuvre et est maintenu appliqué sur le piston par un organe d'appui élastique supporté par le piston. De préférence, l'organe élastique comporte une butée et l'organe de fermeture comporte une cavité ayant une profondeur suffisante pour permettre un déplacement du piston par rapport à l'organe de fermeture selon une direction axiale de la tige de manoeuvre lorsque la cavité de l'organe de fermeture est en regard de l'organe d'appui élastique. Ainsi, l'organe de fermeture est normalement appliqué de façon étanche sur la surface en regard du piston mais lorsque la cavité de l'organe de fermeture est en regard de l'organe d'appui élastique, celui-ci vient en butée et le mouvement axial auquel le piston peut être soumis par rapport à l'organe de fermeture permet alors d'espacer l'organe de fermeture du piston et d'assurer un nettoyage et une stérilisation de l'organe de fermeture sur toutes ses faces.According to another advantageous aspect of the invention, the piston operating rod is mounted to slide axially on a pivoting lug, and the closure member is rigidly fixed to the operating rod and is kept applied to the piston by a elastic support member supported by the piston. Preferably, the elastic member has a stop and the closure member has a cavity having a sufficient depth to allow movement of the piston relative to the closure member in an axial direction of the operating rod when the cavity the closure member is opposite the elastic support member. Thus, the closure member is normally applied in a sealed manner to the surface facing the piston, but when the cavity of the closure member is opposite the elastic support member, the latter abuts and the axial movement to which the piston can be subjected relative to the closing member then makes it possible to space the closing member of the piston and to ensure a cleaning and sterilization of the closure member on all of its faces.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit de modes de réalisation particuliers non limitatifs de l'invention en relation avec les figures ci-jointes parmi lesquelles:
- la figure 1 est une vue schématique en élévation de la pompe selon l'invention, le boîtier étant représenté en coupe par un plan axial,
- la figure 2 est une vue en coupe selon la ligne A-A de la figure 1,
- la figure 3 est une vue partielle de la pompe de la figure 1 dans une position de nettoyage, en coupe selon la ligne III-III de la figure 4,
- la figure 4 est une vue en coupe analogue à celle de la figure 2 pour une position de nettoyage de la pompe,
- la figure 5 est une vue partielle en coupe d'une variante de réalisation de l'invention.
- la figure 6 est une vue de dessous du dispositif de la figure 5.
- FIG. 1 is a schematic elevation view of the pump according to the invention, the housing being shown in section through an axial plane,
- FIG. 2 is a sectional view along the line AA in FIG. 1,
- FIG. 3 is a partial view of the pump of FIG. 1 in a cleaning position, in section along line III-III of FIG. 4,
- FIG. 4 is a sectional view similar to that of FIG. 2 for a cleaning position of the pump,
- Figure 5 is a partial sectional view of an alternative embodiment of the invention.
- FIG. 6 is a bottom view of the device of FIG. 5.
En référence aux figures, la pompe volumétrique selon l'invention comporte un boîtier 1 délimitant une chambre de pompage cylindrique 2 ayant un axe longitudinal 3 et comportant un orifice d'alimentation 4 et un orifice de distribution 5 à des extrémités opposées. Un piston 6 percé d'un orifice de pompage 7 est disposé pour coulisser selon un mouvement alterné dans la chambre de pompage 2 entre l'orifice d'alimentation 4 et l'orifice de distribution 5.With reference to the figures, the positive displacement pump according to the invention comprises a
La position du piston 6 est commandée par une tige de manoeuvre 8 dont l'extrémité inférieure est montée pour pivoter sur un ergot de pivotement 9 fixé sur la face supérieure du piston 6 de façon excentrée par rapport à celui-ci. Un organe de fermeture 10, en forme de palette dans le mode de réalisation illustré, est solidaire de la tige de manoeuvre 8. L'organe de fermeture 10 comporte une face de fermeture inférieure sensiblement plane 11 tournée vers le piston 6 et maintenue appliquée contre la face supérieure du piston 6 par un organe d'appui 12 en forme de plot comportant une collerette sollicitée de façon élastique par un ressort 13 pour prendre appui sur l'organe de fermeture 10. L'organe d'appui 12 est porté par une potence 14 fixée au piston 6. Par ailleurs, l'organe de fermeture 10 comporte sur sa face en regard de l'organe d'appui 12, une cavité 15, ici une rainure dont le fond forme une rampe inclinée vers le bord de l'organe de fermeture 10, qui vient en regard de l'organe d'appui 12 lorsque l'organe de fermeture 10 est pivoté selon un mouvement qui sera expliqué plus en détail ci-dessous.The position of the
La tige de manoeuvre 8 traverse le boîtier 1 en passant dans une bague de guidage 16. Dans le cas où la pompe doit être utilisée pour des opérations de conditionnement dans une ambiance stérile, la bague de guidage 16 comporte, comme illustré sur la figure 1, des joints d'étanchéité 17 délimitant une chambre annulaire 18 balayée par de la vapeur ou de l'eau stérile envoyée dans la chambre annulaire 18 par des conduits d'alimentation et d'évacuation 19.The
A sa partie supérieure, la tige de manoeuvre 18 comporte une partie cannelée 20 sur laquelle est engagé un organe de manoeuvre 21 comportant des cannelures complémentaires pour entraîner la tige de manoeuvre 8 selon un pivotement autour de l'ergot de pivotement 9 lorsque l'organe de manoeuvre 21 est déplacé par un organe de commande tel qu'un vérin pneumatique (non représenté). Pour éviter un déplacement axial de l'organe de manoeuvre 21, celui-ci est de préférence monté dans une chape 22 associée au boîtier de la pompe. Par ailleurs la tige de manoeuvre 8 est associée à un organe de commande (non représenté) tel qu'un vérin pneumatique pour la déplacer selon son axe longitudinal selon un mouvement alterné destiné à déplacer le piston 6 de façon alternée dans la chambre de pompage cylindrique 2.At its upper part, the
Le fonctionnement de la pompe selon l'invention est le suivant : le piston 6 ayant été amené en position haute comme illustré par la figure 1 par un déplacement longitudinal approprié de la tige de manoeuvre 8, l'organe de manoeuvre 21 est commandé pour que l'organe de fermeture 10 vienne recouvrir l'orifice de pompage 7 comme illustré en trait continu sur la figure 2. La tige de manoeuvre 8 est alors commandée pour faire descendre le piston 6 de sorte que du produit à conditionner est aspiré par l'orifice d'alimentation 4 jusqu'à ce que le piston 6 soit dans la position basse illustrée en trait mixte fin sur la figure 1. L'organe de manoeuvre 21 est alors commandé pour faire pivoter l'organe de fermeture 10 comme illustré en trait fin mixte sur la figure 2 de façon à dégager l'orifice de pompage 7. La tige de manoeuvre 8 est commandée pour remonter le piston 6 et le produit à conditionner passe à travers l'orifice de pompage 7 pour venir en-dessous du piston 6 de sorte qu'au coup de pompe suivant une quantité déterminée de produit correspondant au volume balayé par le piston est poussée à travers l'orifice de distribution 5. Bien entendu la pompe est manoeuvrée plusieurs fois au démarrage pour remplir la partie inférieure du boîtier 1 et la canalisation de distribution non représentée. De plus, on prévoit sur des lignes d'alimentation et de distribution de la pompe, des moyens habituels tels que des vannes commandées pour éviter un déplacement du produit à conditionner dans le sens inverse de celui qui est souhaité.The operation of the pump according to the invention is as follows: the
Lorsqu'on souhaite nettoyer, et le cas échéant stériliser la pompe, le piston 6 est amené dans une position extrême inférieure dans une partie 23 du boîtier 1 ayant un diamètre supérieur au diamètre du piston 6. Cette position est illustrée par la figure 3. Simultanément, l'organe de fermeture 10 est pivoté jusqu'à ce que la cavité 15 de l'organe de fermeture 10 soit en regard de l'organe d'appui 12 comme illustré sur la figure 4. L'organe d'appui 12 vient alors en contact avec une butée 24 formée par l'aile inférieure de la potence 14 de sorte que la distance entre l'extrémité inférieure de l'organe d'appui et la face supérieure du piston est supérieure à l'épaisseur du piston au niveau de la cavité 15. Du produit de nettoyage et de stérilisation est envoyé par l'orifice d'admission 4 et s'écoule à travers l'orifice de pompage 7 et tout autour du piston 6. La pression du liquide de nettoyage assure également un décalage vers le bas du piston 6 par rapport à l'organe de fermeture 10 jusqu'à ce que l'extrémité inférieure de l'organe d'appui 12 soit au contact du fond de la rainure 15 comme illustré sur la figure 3. La face inférieure 11 de l'organe de fermeture 10 se trouve alors espacée de la face supérieure du piston 6, ce qui permet le passage du produit de nettoyage entre l'organe de fermeture 10 et la face supérieure du piston 6. La pompe se trouve ainsi totalement soumise au flux du liquide de nettoyage sans qu'il soit nécessaire de procéder à un démontage.When it is desired to clean, and if necessary sterilize the pump, the
La figure 5 illustre une variante de réalisation dans laquelle la tige de manoeuvre 8 comporte un épaulement 25 prenant appui sur l'extrémité supérieure d'une douille 26 solidaire du piston 6. L'organe de fermeture 10 est cette fois disposé en dessous du piston 6 et est entraîné par la tige de manoeuvre 8 au moyen d'une partie de section carrée 27 sur laquelle l'organe de fermeture 10 est maintenu par un écrou 28. Contrairement au mode de réalisation précédent, l'organe de fermeture 10 n'est donc pas susceptible d'un mouvement axial par rapport au piston 6 et pour assurer un nettoyage approprié de la face de fermeture 11 de l'organe de fermeture 10 en regard du piston 6, le piston 6 comporte une zone en surépaisseur 29 entourant l'orifice de pompage et l'axe de pivotement de la tige de manoeuvre 8. Ainsi, lorsque l'organe de fermeture 10 recouvre l'orifice de pompage 7 comme illustré sur la figure 5, l'organe de fermeture 10 assure une fermeture étanche de l'orifice de pompage 7. Au contraire, lorsque l'organe de fermeture 10 est décalé de l'orifice de pompage 7, il se trouve simultanément décalé de la surépaisseur 29 de sorte que, lors du nettoyage, du produit de nettoyage peut circuler entre la face de fermeture 11 et la face inférieure du piston 6.FIG. 5 illustrates an alternative embodiment in which the
Bien entendu l'invention n'est pas limitée aux modes de réalisation décrits et on peut y apporter des variantes de réalisation sans sortir du cadre de l'invention.Of course, the invention is not limited to the embodiments described and it is possible to make variant embodiments without going beyond the ambit of the invention.
En particulier, bien que dans le mode de réalisation préféré illustré la tige de manoeuvre 8 du piston 6 serve simultanément à faire pivoter l'organe de fermeture 10, on peut réaliser une pompe comportant une tige de manoeuvre séparée pour l'organe de fermeture 10.In particular, although in the preferred embodiment illustrated the
Dans le cas d'un conditionnement stérile, on pourra également prévoir de façon avantageuse un soufflet disposé autour de la tige de manoeuvre 8 sur une longueur au moins égale à la course du piston 6 afin de minimiser l'introduction de poussières polluantes dans la pompe.In the case of sterile packaging, it is also possible to advantageously provide a bellows disposed around the operating
Dans le mode de réalisation de la figure 5, on a représenté une zone en surépaisseur 29 s'étendant de façon continue entre l'orifice de pompage 7 et l'axe de pivotement de la tige de manoeuvre 8. On peut bien entendu prévoir deux zones en surépaisseur séparées formant un rebord de même épaisseur autour de la tige de manoeuvre 8 et de l'orifice de pompage 7 afin de minimiser les frottements de l'organe de fermeture 10 sur la face du piston 6.In the embodiment of FIG. 5, an
Bien que l'on ait envisagé une commande des mouvements de la tige de manoeuvre 8 et de l'organe de manoeuvre 21 par des vérins pneumatiques, le mouvement de ces organes peut également être commandé par des cames en particulier lorsque la pompe selon l'invention est disposée à chaque poste d'un carrousel, les organes des différentes pompes étant alors équipés de galets suiveurs de came qui coopèrent tous avec les mêmes cames fixes.Although consideration has been given to controlling the movements of the operating
Bien que l'invention ait été décrite avec une chambre de pompage ayant une section circulaire, on peut réaliser la pompe selon l'invention avec une chambre de pompage de section non circulaire, par exemple ovale ou elliptique. Dans ce cas il n'y a plus de risque de faire tourner le piston sur lui-même autour de l'axe longitudinal de la chambre de pompage et la tige de manoeuvre 8 peut donc être disposée selon l'axe de la chambre de pompage.Although the invention has been described with a pumping chamber having a circular section, the pump according to the invention can be produced with a pumping chamber of non-circular section, for example oval or elliptical. In this case there is no longer any risk of turning the piston on itself around the longitudinal axis of the pumping chamber and the operating
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9204232A FR2689570B1 (en) | 1992-04-07 | 1992-04-07 | VOLUMETRIC PUMP. |
FR9204232 | 1992-04-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0569262A1 true EP0569262A1 (en) | 1993-11-10 |
EP0569262B1 EP0569262B1 (en) | 1995-07-05 |
Family
ID=9428581
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93400864A Expired - Lifetime EP0569262B1 (en) | 1992-04-07 | 1993-04-02 | Volumetric pump |
Country Status (6)
Country | Link |
---|---|
US (1) | US5292236A (en) |
EP (1) | EP0569262B1 (en) |
BR (1) | BR9300903A (en) |
DE (1) | DE69300240T2 (en) |
ES (1) | ES2075765T3 (en) |
FR (1) | FR2689570B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3388921B2 (en) * | 1994-11-29 | 2003-03-24 | 株式会社東芝 | Manufacturing method of integrated circuit card |
JPH08326655A (en) * | 1995-06-05 | 1996-12-10 | Calsonic Corp | Swash plate compressor |
FR2817848B1 (en) * | 2000-12-12 | 2003-03-07 | Rexam Sofab | ELECTRONIC MICROPUMP |
US10859071B2 (en) * | 2018-08-14 | 2020-12-08 | Stinger Oil Tools Llc | Rotary traveling valve |
IT201800009425A1 (en) * | 2018-10-12 | 2020-04-12 | Romaco Srl | DEVICE AND EQUIPMENT FOR THE DISPENSING OF DOSED QUANTITIES OF A LIQUID MATERIAL |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0093691A1 (en) * | 1982-04-21 | 1983-11-09 | Kurt Stauffer | Piston pump for liquids |
DE3541708A1 (en) * | 1985-08-16 | 1987-05-27 | Heinz Buechner | Piston pump without inlet and outlet valves |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1322552A (en) * | 1919-11-25 | Francis j | ||
US1419151A (en) * | 1920-06-25 | 1922-06-13 | Christian S Kurtz | Pump |
US2175000A (en) * | 1937-06-23 | 1939-10-03 | Schlesinger Sigmund | Apparatus for the picking up of loops or meshes dropped in hosiery and knitted goods |
US2231941A (en) * | 1939-09-05 | 1941-02-18 | Nels M Ohman | Vacuum gold dredge |
US3981635A (en) * | 1973-09-14 | 1976-09-21 | Hedlund Manufacturing Co., Inc. | Material handling system |
JPS5751973A (en) * | 1980-09-11 | 1982-03-27 | Okimoto Tamada | Piston pump |
US4878819A (en) * | 1988-04-14 | 1989-11-07 | Edward Bozoyan | OTR safety urinal pumps |
-
1992
- 1992-04-07 FR FR9204232A patent/FR2689570B1/en not_active Expired - Fee Related
-
1993
- 1993-03-23 US US08/035,621 patent/US5292236A/en not_active Expired - Fee Related
- 1993-04-01 BR BR9300903A patent/BR9300903A/en not_active Application Discontinuation
- 1993-04-02 ES ES93400864T patent/ES2075765T3/en not_active Expired - Lifetime
- 1993-04-02 DE DE69300240T patent/DE69300240T2/en not_active Expired - Fee Related
- 1993-04-02 EP EP93400864A patent/EP0569262B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0093691A1 (en) * | 1982-04-21 | 1983-11-09 | Kurt Stauffer | Piston pump for liquids |
DE3541708A1 (en) * | 1985-08-16 | 1987-05-27 | Heinz Buechner | Piston pump without inlet and outlet valves |
Also Published As
Publication number | Publication date |
---|---|
FR2689570A1 (en) | 1993-10-08 |
ES2075765T3 (en) | 1995-10-01 |
US5292236A (en) | 1994-03-08 |
FR2689570B1 (en) | 1994-05-27 |
EP0569262B1 (en) | 1995-07-05 |
DE69300240T2 (en) | 1996-04-04 |
DE69300240D1 (en) | 1995-08-10 |
BR9300903A (en) | 1993-10-13 |
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