EP1000246B1 - Improvement to a pump body and method for making same - Google Patents

Improvement to a pump body and method for making same Download PDF

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Publication number
EP1000246B1
EP1000246B1 EP98941492A EP98941492A EP1000246B1 EP 1000246 B1 EP1000246 B1 EP 1000246B1 EP 98941492 A EP98941492 A EP 98941492A EP 98941492 A EP98941492 A EP 98941492A EP 1000246 B1 EP1000246 B1 EP 1000246B1
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EP
European Patent Office
Prior art keywords
cavity
projection
pump
pump according
upper stop
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.)
Expired - Lifetime
Application number
EP98941492A
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German (de)
French (fr)
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EP1000246A1 (en
Inventor
Jean-Louis Bougamont
Pierre Dumont
Hervé Lompech
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.)
S O F A B
Albea Le Treport SAS
Original Assignee
S O F A B
Sofab SA
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Publication date
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Publication of EP1000246A1 publication Critical patent/EP1000246A1/en
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Publication of EP1000246B1 publication Critical patent/EP1000246B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • 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
    • F04B53/1002—Ball valves
    • F04B53/101—Ball valves having means for limiting the opening height
    • 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
    • B05B11/1067—Pump inlet valves actuated by pressure
    • 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
    • B05B11/1023—Piston pumps having an outlet valve opened by deformation or displacement of the piston relative to its actuating stem
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49274—Piston ring or piston packing making
    • Y10T29/49279—Piston ring or piston packing making including rolling or die forming, e.g., drawing, punching

Definitions

  • the present invention relates to a pump and more particularly an improvement of the intake valve of the pump as well as a method of manufacturing such a pump.
  • the invention relates to pumps of the type comprising in particular a substantially cylindrical body in one piece, provided, in its lower part, a product intake duct and a valve.
  • This valve consists in known manner of a cavity forming seat and containing an element capable of moving between a lower stop corresponding to a closed position of the duct intake and a high stop corresponding to the opening of said conduit and filling the pump body with the product.
  • the stroke of the movable element which generally consists of a ball, must be adjusted so as to obtain regular delivery by the pump of identical and constant doses.
  • the upper and lower stops must be precisely positioned.
  • the upper stop consists of the lower coil of a helical return spring housed in the body of pump.
  • An alternative embodiment of this upper stop consists in fixing an insert in the lower part of the pump body above the movable element.
  • bosses protrude inside the pump body and demarcate upwards the cavity in which the movable element is housed.
  • the transverse dimension of these bosses measured at from the inner wall of the body always remains weak compared to the internal diameter of the cavity to allow the mold to be removed from the mold and the subsequent introduction of the movable element into the cavity.
  • the section of these retaining bosses does not include angular area or free edge undercut. Yet despite this, sometimes when the mold is ejected, the bosses are crushed protruding, which considerably compromises the subsequent reliability of the pump insofar as the movable element can then escape from its cavity.
  • the present invention aims to solve, so satisfactory, the technical problems posed by the prior art.
  • a pump of the type comprising in particular a substantially cylindrical body in a single piece provided, in its lower part with a product inlet duct and a valve constituted a cavity containing an element capable of moving between a low stop corresponding to the closing of said intake duct and a high stop corresponding to the opening of said duct, characterized in that said upper stop is formed of at least one discontinuous internal projection whose transverse dimension measured in the cavity is at least equal to 20% of the largest transverse dimension of the movable element.
  • said projection has a inner edge whose generatrices are substantially parallel to the axis from the body.
  • said movable element is a ball and said cavity is cylindroconical.
  • said cavity has a upper orifice delimited laterally by the internal projection and the diameter is between 50% and 90% of the largest dimension transverse of the movable element.
  • the upper face of said projection is wider than its underside.
  • said projection is surmounted, outside of said cavity, of an at least partially cylindrical cut whose generatrices are parallel to the axis of the body.
  • the upper stop includes four diametrically opposite projections two by two.
  • the free sectors have a angular length between 30 ° and 80 °.
  • Another object of the invention is a method of manufacturing a pump characterized in that the pump body is produced and then formed at least one discontinuous internal projection by shaping the internal wall of said body by means of a punch whose diameter of the head is between 110% and 140% of the largest transverse dimension of the movable element.
  • the transverse dimension of the internal projection, the diameter of the upper hole of the cavity as well as the diameter of the head of the punch are parameters that are chosen with reference to the largest transverse dimension of the mobile element but which also depend on the depth of penetration of the punch into the wall of the body of the pump. This depth is limited by the available wall thickness in the area intended for shaping and has been fixed, for the determination values of the above parameters, at 25% of the wall thickness of the pump body.
  • said interior is shaped body with a punch with four diametrically opposed blades two to of them.
  • the pump of the invention thus comprises an intake valve particularly reliable and precise. With such a valve, the risks of jamming or exhausting of the moving element are practically nonexistent.
  • the method of the invention makes it possible to produce projections whose transverse dimension is so important that they would not be achievable by molding and which, moreover, would not allow the setting in place of the movable element.
  • the method of the invention also makes it possible to carry out projections of various dimensions on the same type of pump body, this which allows the use of mobile elements of different sizes.
  • the body 1 shown in Figure 1 corresponds to that of a traditional pump A used, for example, for sprayers liquids such as perfumes.
  • the body 1 is substantially cylindrical and is produced in a single piece, for example, by injection molding of a material thermoplastic.
  • the body 1 is provided in its lower part 1a with a conduit inlet 11 supplied with product from a tank (not shown) and possibly extended downwards by a dip tube.
  • the intake duct 11 opens out through an orifice 11a onto a valve consisting of a cavity 10 containing a movable element such than a ball 2.
  • the ball 2 is capable of moving axially between a low stop 12b corresponding to the obturation of the conduit 11 and therefore to the closing of the valve, and a high stop 12a corresponding to the opening said valve and the passage of the product towards the chamber B of the pump A.
  • the lower stop 12b is formed by the frustoconical wall of the cavity 10 against which the ball 2 comes into sealing contact.
  • the upper stop 12a is formed here of retaining elements produced directly by molding, with the entire pump body, at the upper part of the cavity 10.
  • These retaining elements are bosses which provide the ball 2 of the slightly projecting curvilinear contact surfaces, that is to say that each boss has a transverse dimension of at most 20% of the radius R of ball 2, which is insufficient to guarantee a perfect functioning of the valve.
  • Figures 2a and 2b show partial sectional views of an embodiment of the body 1 of a pump according to the invention respectively in the closed and open position of the valve.
  • the upper stop 12a is here formed of at least one internal projection 120 produced on the upper periphery of the cavity 10 and so discontinuous with at least one side passage for the product around the ball 2.
  • the transverse dimension X of the projection 12a measured in the cylindroconical cavity 10 is at least equal to 20% of the largest transverse dimension of the movable element and therefore of the diameter of the ball 2 or at 40% of its radius R.
  • the cavity 10 is therefore delimited and partially closed in its upper part by a transverse wall portion whose total length corresponds to twice the transverse dimension X, i.e. at least 40% the diameter of the ball 2 (or 80% of the radius R), which guarantees a translational locking of the ball without jamming.
  • the upper opening 10a of the cavity 10 is therefore relatively narrow and its diameter is between 50% and 90% of the largest transverse dimension of the mobile element which here corresponds to the ball diameter 2.
  • the projection 120 has an inner edge 120c whose generatrices are substantially parallel to the axis of the body 1.
  • the projection 120 is surmounted, outside the cavity 10, by a at least partially cylindrical cutout 13 whose generatrices are substantially parallel to the axis of the body 1.
  • the upper face 120a of the projection 120 which is turned towards the outside of the cavity 10 is wider than the lower face 120b which is shown here for reasons of simplification, parallel to the face upper 120a and perpendicular to the internal wall of the cavity 10 in its upper part.
  • the lower face 120b of the projection 120 is inclined, curvilinear or consists of a bulge but in no case has a zone of contact with the ball 2 in position high stop to avoid any guide or sliding of the ball out of cavity 10.
  • the contact area between the projection 120 and the ball 2 is materialized by a substantially circular line on which the support forces are directed radially with respect to the ball so as to avoid jamming.
  • Figures 3a and 3b correspond to an embodiment with four projections 120, 121, 122, 123 diametrically opposite two to two on the upper periphery of the cavity 10. In these figures, the ball 2 was not represented.
  • the cuts 13 are interrupted at the discontinuities projections 120, 121, 122, 123 to delimit free sectors 14.
  • the profile of the internal wall of the body of pump has not been modified and is therefore smooth and continuous, so as not to present no obstacle from the inside to the outside of the cavity 10 to allow free passage of the product.
  • the projections 120, 121, 122, 123 are here centered, on the one hand and on the other, on two perpendicular diameters.
  • Their respective inner edges 120c, 121c, 122c, 123c have a length such that the free sectors 14 intermediate correspond to portions of angles ⁇ between 30 ° and 80 °.
  • the pump A of the invention and in particular, the body 1 of said pump is produced in a traditional way, for example, by molding injection of plastic or thermoplastic material.
  • the ball 2 is introduced into the lower part 1a of the body 1 prior to shaping, when the internal wall is still uniform.
  • the internal projection 120 is elastically deformable and / or flexible, it is then possible to introduce the ball after shaping, by deforming support on said projection.
  • This shaping or stamping operation is carried out by means of a punch P such as that shown in FIGS. 4a and 4b.
  • the punch P comprises a mandrel M carrying a head T.
  • the mandrel M provides centering, guiding and setting of the punch in the pump body during shaping.
  • the head T ensures the shaping of the body by axial translation and force of the mandrel M as shown in FIG. 5.
  • the head T comprises at least one, and here four blades L intended to repel the material on the wall of the body 1 above and around the ball 2, forming the cutouts 13, and the projections 120, 121, 122, 123 as shown in FIG. 5.
  • the diameter d of the head is between 110% and 140% of the bimetal diameter for a penetration depth of about 25% of the thickness of the body wall
  • the geometry of the blades L shown in bottom view on the Figure 4b determines the subsequent geometry of the cutouts 13 of the projections 120, 121, 122, 123 and free sectors 14.
  • the lower face C of the blades L acts by its edge outside the like a knife or a tooth vis-à-vis the plastic in causing it to flow towards the inside of the head.
  • the width and length of the underside C is determined beforehand depending on the dimensions sought for the projections.
  • the transverse dimension X of the projections to be produced will depend on the volume of material pushed down and inward by each blades L on the inner periphery of the cavity 10. This volume therefore corresponds to the volume delimited by the cutouts 13. However, this volume is itself a function of the diameter of the head T, of the width x the underside C and the depth of penetration, the length angular y and the height h of the blades L.
  • the outer face l of the blades L is straight and parallel to the axis of the mandrel M while their internal face is inclined towards the mandrel M and towards the center of the head T with an angle ⁇ close to 45 ° so as not to use the ball when working the head.
  • the mandrel M has a face E intended to come into abutment against a shoulder 1b of the pump body (see Figures 2a and 2b) to limit the sinking of the T head.

Abstract

A pump of the type comprising a substantially cylindrical body (1) in one piece provided, in its lower part, with a port (11) for admission of a product and with a valve constituted by a cavity (10) containing an element (2) capable of moving between a lower stop (12b) corresponding to the obturation of said admission port (11) and an upper stop (12a) corresponding to the opening of said port (11), and wherein said upper stop (12a) is formed by at least one discontinuous internal projection (12) whose transverse dimension (x) measured in the cavity (10) is at least equal to 20% of the largest transverse dimension of the mobile element (2).

Description

La présente invention concerne une pompe et plus particulièrement un perfectionnement du clapet d'admission de la pompe ainsi qu'un procédé de fabrication d'une telle pompe.The present invention relates to a pump and more particularly an improvement of the intake valve of the pump as well as a method of manufacturing such a pump.

L'invention s'intéresse aux pompes du type comprenant notamment un corps sensiblement cylindrique en seule pièce, pourvu, dans sa partie inférieure, d'un conduit d'admission du produit et d'un clapet. Ce clapet est constitué de manière connue, d'une cavité formant siège et renfermant un élément susceptible de se déplacer entre une butée basse correspondant à une position d'obturation du conduit d'admission et une butée haute correspondant à l'ouverture dudit conduit et au remplissage du corps de pompe par le produit.The invention relates to pumps of the type comprising in particular a substantially cylindrical body in one piece, provided, in its lower part, a product intake duct and a valve. This valve consists in known manner of a cavity forming seat and containing an element capable of moving between a lower stop corresponding to a closed position of the duct intake and a high stop corresponding to the opening of said conduit and filling the pump body with the product.

La course de l'élément mobile qui est généralement constitué d'une bille, doit être ajustée de façon à obtenir la délivrance régulière par la pompe de doses identiques et constantes.The stroke of the movable element which generally consists of a ball, must be adjusted so as to obtain regular delivery by the pump of identical and constant doses.

Par conséquent, les butées haute et basse doivent être positionnées avec précision.Therefore, the upper and lower stops must be precisely positioned.

Selon une solution connue, la butée haute est constituée de la spire inférieure d'un ressort hélicoïdal de rappel logé dans le corps de pompe.According to a known solution, the upper stop consists of the lower coil of a helical return spring housed in the body of pump.

Mais, ce ressort crée des problèmes d'encombrement et/ou de compatibilité avec le produit.However, this spring creates problems of bulk and / or compatibility with the product.

Une variante de réalisation de cette butée haute consiste à fixer une pièce rapportée dans la partie inférieure du corps de pompe au-dessus de l'élément mobile.An alternative embodiment of this upper stop consists in fixing an insert in the lower part of the pump body above the movable element.

Cependant, la réalisation de cette pièce et son montage dans la pompe sont des opérations complexes et onéreuses.However, the production of this piece and its mounting in the pump are complex and expensive operations.

En outre, il est nécessaire de réaliser sur le corps de pompe des moyens spécifiques pour la fixation de cette pièce.In addition, it is necessary to make on the pump body specific means for fixing this part.

Une autre solution passe par la présence de bossages de retenue réalisés directement au moulage du corps de pompe comme dans le US 2 294 568.Another solution involves the presence of retaining bosses produced directly by molding the pump body as in the US 2,294,568.

Ces bossages font saillie à l'intérieur du corps de pompe et délimitent vers le haut la cavité dans laquelle est logé l'élément mobile. These bosses protrude inside the pump body and demarcate upwards the cavity in which the movable element is housed.

Cependant, la dimension transversale de ces bossages mesurée à partir de la paroi interne du corps, reste toujours faible par rapport au diamètre intérieur de la cavité pour permettre le démoulage du corps et l'introduction ultérieure de l'élément mobile dans la cavité. Pour les mêmes raisons, la section de ces bossages de retenue ne comporte ni zone angulaire ni bord franc en contre-dépouille. Pourtant malgré cela, il se produit parfois à l'éjection du moule, un écrasement des bossages en saillie, ce qui compromet considérablement la fiabilité ultérieure de la pompe dans la mesure où l'élément mobile peut alors s'échapper de sa cavité.However, the transverse dimension of these bosses measured at from the inner wall of the body, always remains weak compared to the internal diameter of the cavity to allow the mold to be removed from the mold and the subsequent introduction of the movable element into the cavity. For the same reasons, the section of these retaining bosses does not include angular area or free edge undercut. Yet despite this, sometimes when the mold is ejected, the bosses are crushed protruding, which considerably compromises the subsequent reliability of the pump insofar as the movable element can then escape from its cavity.

Dans le Patent Abstracts of Japan Vol.15 n° 392 du 4 octobre 1991 et le JP-A-316 1066, la butée haute de l'élément mobile du clapet est assurée au moyen de saillies internes discontinues réalisées par découpe avec un outil à lame dont le profil est biseauté.In Patent Abstracts of Japan Vol. 15 No. 392 of October 4, 1991 and JP-A-316 1066, the upper stop of the movable element of the valve is ensured by means of discontinuous internal projections made by cutting with a blade tool whose profile is bevelled.

Toutefois, le profil non agressif de ces saillies favorise le coincement de l'élément mobile dans le haut de la cavité, ce qui augmente les risques de dysfonctionnement de la pompe.However, the non-aggressive profile of these projections promotes the jamming of the movable element in the top of the cavity, which increases the risk of pump malfunction.

Tous ces problèmes sont encore plus sensibles lorsque la pompe est une pompe miniature, destinée, par exemple, à des échantillons de parfum ou des distributeurs de faibles doses de médicaments.All these problems are even more sensitive when the pump is a miniature pump, intended, for example, for samples of perfume or dispensers for low doses of drugs.

La présente invention a pour but de résoudre, de manière satisfaisante, les problèmes techniques posés par l'art antérieur.The present invention aims to solve, so satisfactory, the technical problems posed by the prior art.

Ce but est atteint, conformément à l'invention, au moyen d'une pompe du type comprenant notamment un corps sensiblement cylindrique en une seule pièce pourvu, dans sa partie inférieure d'un conduit d'admission du produit et d'un clapet constitué d'une cavité renfermant un élément susceptible de se déplacer entre une butée basse correspondant à l'obturation dudit conduit d'admission et une butée haute correspondant à l'ouverture dudit conduit,
   caractérisée en ce que ladite butée haute est formée d'au moins une saillie interne discontinue dont la dimension transversale mesurée dans la cavité est au moins égale à 20% de la plus grande dimension transversale de l'élément mobile.This object is achieved, in accordance with the invention, by means of a pump of the type comprising in particular a substantially cylindrical body in a single piece provided, in its lower part with a product inlet duct and a valve constituted a cavity containing an element capable of moving between a low stop corresponding to the closing of said intake duct and a high stop corresponding to the opening of said duct,
characterized in that said upper stop is formed of at least one discontinuous internal projection whose transverse dimension measured in the cavity is at least equal to 20% of the largest transverse dimension of the movable element.

Selon une caractéristique avantageuse, ladite saillie présente un bord intérieur dont les génératrices sont sensiblement parallèles à l'axe du corps. According to an advantageous characteristic, said projection has a inner edge whose generatrices are substantially parallel to the axis from the body.

Selon un mode de réalisation préférentiel, ledit élément mobile est une bille et ladite cavité est cylindroconique.According to a preferred embodiment, said movable element is a ball and said cavity is cylindroconical.

Selon encore une autre caractéristique, ladite cavité possède un orifice supérieur délimité latéralement par la saillie interne et dont le diamètre est compris entre 50% et 90% de la plus grande dimension transversale de l'élément mobile.According to yet another characteristic, said cavity has a upper orifice delimited laterally by the internal projection and the diameter is between 50% and 90% of the largest dimension transverse of the movable element.

Selon d'autres caractéristiques, la face supérieure de ladite saillie est plus large que sa face inférieure.According to other characteristics, the upper face of said projection is wider than its underside.

De préférence, ladite saillie est surmontée, à l'extérieur de ladite cavité, d'une découpe au moins partiellement cylindrique dont les génératrices sont parallèles à l'axe du corps.Preferably, said projection is surmounted, outside of said cavity, of an at least partially cylindrical cut whose generatrices are parallel to the axis of the body.

Selon un mode de réalisation particulier, la butée haute comprend quatre saillies diamétralement opposées deux à deux.According to a particular embodiment, the upper stop includes four diametrically opposite projections two by two.

Ces quatre saillies sont séparées, de préférence, par des secteurs libres susceptibles de laisser passer le produit.These four projections are preferably separated by sectors free likely to let pass the product.

Selon une variante spécifique, les secteurs libres ont une longueur angulaire comprise entre 30° et 80°.According to a specific variant, the free sectors have a angular length between 30 ° and 80 °.

Un autre objet de l'invention est un procédé de fabrication d'une pompe caractérisée en ce qu'on réalise le corps de pompe puis on forme au moins une saillie interne discontinue en façonnant la paroi interne dudit corps au moyen d'un poinçon dont le diamètre de la tête est compris entre 110% et 140% de la plus grande dimension transversale de l'élément mobile.Another object of the invention is a method of manufacturing a pump characterized in that the pump body is produced and then formed at least one discontinuous internal projection by shaping the internal wall of said body by means of a punch whose diameter of the head is between 110% and 140% of the largest transverse dimension of the movable element.

La dimension transversale de la saillie interne, le diamètre de l'orifice supérieur de la cavité ainsi que le diamètre de la tête du poinçon sont des paramètres qui sont choisis en référence à la plus grande dimension transversale de l'élément mobile mais qui dépendent aussi de la profondeur de pénétration du poinçon dans la paroi du corps de la pompe. Cette profondeur est limitée par l'épaisseur disponible de paroi dans la zone destinée au façonnage et a été fixée, pour la détermination des valeurs des paramètres ci-dessus, à 25% de l'épaisseur de paroi du corps de pompe.The transverse dimension of the internal projection, the diameter of the upper hole of the cavity as well as the diameter of the head of the punch are parameters that are chosen with reference to the largest transverse dimension of the mobile element but which also depend on the depth of penetration of the punch into the wall of the body of the pump. This depth is limited by the available wall thickness in the area intended for shaping and has been fixed, for the determination values of the above parameters, at 25% of the wall thickness of the pump body.

Selon une caractéristique avantageuse du procédé, on façonne intérieurement ledit corps en repoussant avec le poinçon, la matière constitutive de la paroi vers le bas et vers l'intérieur de façon à fermer partiellement la cavité.According to an advantageous characteristic of the process, one shapes internally said body by pushing back with the punch, the material constituting the wall downwards and inwards so as to close partially the cavity.

Selon une autre caractéristique, on façonne intérieurement ledit corps avec un poinçon à quatre lames diamétralement opposées deux à deux. According to another characteristic, said interior is shaped body with a punch with four diametrically opposed blades two to of them.

Selon encore une autre caractéristique du procédé, qu'on introduit l'élément mobile dans la partie inférieure du corps, préalablement à la formation de ladite saillie interne.According to yet another characteristic of the process, which introduces the movable element into the lower part of the body, prior to the formation of said internal projection.

La pompe de l'invention comporte ainsi un clapet d'admission particulièrement fiable et précis. Avec un tel clapet, les risques de coincement ou d'échappement de l'élément mobile sont pratiquement inexistants.The pump of the invention thus comprises an intake valve particularly reliable and precise. With such a valve, the risks of jamming or exhausting of the moving element are practically nonexistent.

En outre, le procédé de l'invention permet de réaliser des saillies dont la dimension transversale est si importante qu'elles ne seraient pas réalisables par moulage et qui, par ailleurs, ne permettraient pas la mise en place ultérieure de l'élément mobile.In addition, the method of the invention makes it possible to produce projections whose transverse dimension is so important that they would not be achievable by molding and which, moreover, would not allow the setting in place of the movable element.

Le procédé de l'invention permet également de réaliser des saillies de dimensions diverses sur un même type de corps de pompe, ce qui autorise l'utilisation d'éléments mobiles de différentes tailles.The method of the invention also makes it possible to carry out projections of various dimensions on the same type of pump body, this which allows the use of mobile elements of different sizes.

L'invention sera mieux comprise à la lecture de la description qui va suivre accompagnée des dessins sur lesquels :

  • la figure 1 représente une vue en coupe d'un corps de pompe selon l'art antérieur ;
  • les figures 2a et 2b représentent des vues de détail en coupe d'un mode de réalisation d'un corps de pompe selon l'invention, respectivement en position de fermeture et en position d'ouverture du clapet ;
  • les figures 3a et 3b représentent des vues partielles de dessus du corps de pompe respectivement avant et après façonnage ;
  • la figure 4a représente une vue de profil d'un poinçon utilisé par le procédé de l'invention ;
  • la figure 4b représente une vue de dessous du poinçon de la figure 4a ;
  • la figure 5 représente une vue en coupe du corps de pompe pendant la mise en oeuvre du procédé de l'invention.
The invention will be better understood on reading the description which follows, accompanied by the drawings in which:
  • Figure 1 shows a sectional view of a pump body according to the prior art;
  • Figures 2a and 2b show detailed sectional views of an embodiment of a pump body according to the invention, respectively in the closed position and in the open position of the valve;
  • Figures 3a and 3b show partial top views of the pump body respectively before and after shaping;
  • FIG. 4a represents a profile view of a punch used by the method of the invention;
  • Figure 4b shows a bottom view of the punch of Figure 4a;
  • 5 shows a sectional view of the pump body during the implementation of the method of the invention.

Le corps 1 représenté sur la figure 1 correspond à celui d'une pompe A traditionnelle utilisée, par exemple, pour des pulvérisateurs de liquides tels que des parfums.The body 1 shown in Figure 1 corresponds to that of a traditional pump A used, for example, for sprayers liquids such as perfumes.

Le corps 1 est sensiblement cylindrique et est réalisé en une seule pièce, par exemple, par moulage à injection d'une matière thermoplastique. The body 1 is substantially cylindrical and is produced in a single piece, for example, by injection molding of a material thermoplastic.

Le corps 1 est pourvu dans sa partie inférieure 1a d'un conduit d'admission 11 alimenté en produit à partir d'un réservoir (non représenté) et éventuellement prolongé vers le bas par un tube plongeur.The body 1 is provided in its lower part 1a with a conduit inlet 11 supplied with product from a tank (not shown) and possibly extended downwards by a dip tube.

Le conduit d'admission 11 débouche par un orifice 11a sur un clapet constitué d'une cavité 10 renfermant un élément mobile tel qu'une bille 2.The intake duct 11 opens out through an orifice 11a onto a valve consisting of a cavity 10 containing a movable element such than a ball 2.

La bille 2 est susceptible de se déplacer axialement entre une butée basse 12b correspondant à l'obturation du conduit 11 et donc à la fermeture du clapet, et une butée haute 12a correspondant à l'ouverture dudit clapet et au passage du produit vers la chambre B de la pompe A.The ball 2 is capable of moving axially between a low stop 12b corresponding to the obturation of the conduit 11 and therefore to the closing of the valve, and a high stop 12a corresponding to the opening said valve and the passage of the product towards the chamber B of the pump A.

La butée basse 12b est formée par la paroi tronconique de la cavité 10 contre laquelle la bille 2 vient en appui étanche.The lower stop 12b is formed by the frustoconical wall of the cavity 10 against which the ball 2 comes into sealing contact.

La butée haute 12a est formée ici d'éléments de retenue réalisés directement par moulage, avec l'ensemble du corps de pompe, à la partie supérieure de la cavité 10.The upper stop 12a is formed here of retaining elements produced directly by molding, with the entire pump body, at the upper part of the cavity 10.

Ces éléments de retenue sont des bossages qui offrent à la bille 2 des surfaces de contact curvilignes faiblement en saillie, c'est-à-dire que chaque bossage a une dimension transversale d'au plus 20% du rayon R de la bille 2, ce qui est insuffisant pour garantir un fonctionnement parfait du clapet.These retaining elements are bosses which provide the ball 2 of the slightly projecting curvilinear contact surfaces, that is to say that each boss has a transverse dimension of at most 20% of the radius R of ball 2, which is insufficient to guarantee a perfect functioning of the valve.

Entre ces bossages sont ménagés des passages latéraux pour le produit.Between these bosses are formed lateral passages for the product.

Les figures 2a et 2b représentent des vues partielles en coupe d'un mode de réalisation du corps 1 d'une pompe selon l'invention respectivement en position de fermeture et d'ouverture du clapet.Figures 2a and 2b show partial sectional views of an embodiment of the body 1 of a pump according to the invention respectively in the closed and open position of the valve.

La butée haute 12a est ici formée d'au moins une saillie interne 120 réalisée sur le pourtour supérieur de la cavité 10 et de façon discontinue en ménageant au moins un passage latéral pour le produit autour de la bille 2.The upper stop 12a is here formed of at least one internal projection 120 produced on the upper periphery of the cavity 10 and so discontinuous with at least one side passage for the product around the ball 2.

La dimension transversale X de la saillie 12a mesurée dans la cavité cylindroconique 10 est au moins égale à 20% de la plus grande dimension transversale de l'élément mobile et donc du diamètre de la bille 2 ou à 40% de son rayon R.The transverse dimension X of the projection 12a measured in the cylindroconical cavity 10 is at least equal to 20% of the largest transverse dimension of the movable element and therefore of the diameter of the ball 2 or at 40% of its radius R.

La cavité 10 est donc délimitée et fermée partiellement dans sa partie haute par une portion de paroi transversale dont la longueur totale correspond à deux fois la dimension transversale X soit au moins 40% du diamètre de la bille 2 (ou à 80% du rayon R), ce qui garantit un blocage en translation de la bille sans coincement.The cavity 10 is therefore delimited and partially closed in its upper part by a transverse wall portion whose total length corresponds to twice the transverse dimension X, i.e. at least 40% the diameter of the ball 2 (or 80% of the radius R), which guarantees a translational locking of the ball without jamming.

L'orifice supérieur 10a de la cavité 10 est donc relativement étroit et son diamètre est compris entre 50% et 90% de la plus grande dimension transversale de l'élément mobile qui correspond ici au diamètre de la bille 2.The upper opening 10a of the cavity 10 is therefore relatively narrow and its diameter is between 50% and 90% of the largest transverse dimension of the mobile element which here corresponds to the ball diameter 2.

La saillie 120 présente un bord intérieur 120c dont les génératrices sont sensiblement parallèles à l'axe du corps 1.The projection 120 has an inner edge 120c whose generatrices are substantially parallel to the axis of the body 1.

La saillie 120 est surmontée, à l'extérieur de la cavité 10, d'une découpe 13 au moins partiellement cylindrique dont les génératrices sont sensiblement parallèles à l'axe du corps 1.The projection 120 is surmounted, outside the cavity 10, by a at least partially cylindrical cutout 13 whose generatrices are substantially parallel to the axis of the body 1.

La face supérieure 120a de la saillie 120 qui est tournée vers l'extérieur de la cavité 10, est plus large que la face inférieure 120b qui est représentée ici pour des raisons de simplification, parallèle à la face supérieure 120a et perpendiculaire à la paroi interne de la cavité 10 dans sa partie haute.The upper face 120a of the projection 120 which is turned towards the outside of the cavity 10 is wider than the lower face 120b which is shown here for reasons of simplification, parallel to the face upper 120a and perpendicular to the internal wall of the cavity 10 in its upper part.

Selon une variante, non représentée, la face inférieure 120b de la saillie 120 est inclinée, curviligne ou constituée d'un renflement mais ne présente en aucun cas une zone de contact avec la bille 2 en position de butée haute pour éviter tout guidage ou glissement de la bille hors de la cavité 10.According to a variant, not shown, the lower face 120b of the projection 120 is inclined, curvilinear or consists of a bulge but in no case has a zone of contact with the ball 2 in position high stop to avoid any guide or sliding of the ball out of cavity 10.

Dans la position d'ouverture du clapet, représentée sur la figure 2b, la bille est bloquée en translation par la butée haute 12a en venant en appui contre la jonction entre le bord intérieur 120c et la face inférieure 120b de la saillie 120.In the valve open position, shown in the figure 2b, the ball is blocked in translation by the upper stop 12a coming from resting against the junction between the inner edge 120c and the face lower 120b of the projection 120.

Par conséquent, la zone de contact entre la saillie 120 et la bille 2 est matérialisée par une ligne sensiblement circulaire sur laquelle les forces d'appui sont dirigées radialement par rapport à la bille de façon à éviter tout coincement.Consequently, the contact area between the projection 120 and the ball 2 is materialized by a substantially circular line on which the support forces are directed radially with respect to the ball so as to avoid jamming.

Les figures 3a et 3b correspondent à un mode de réalisation avec quatre saillies 120, 121, 122, 123 diamétralement opposées deux à deux sur le pourtour supérieur de la cavité 10. Sur ces figures, la bille 2 n'a pas été représentée.Figures 3a and 3b correspond to an embodiment with four projections 120, 121, 122, 123 diametrically opposite two to two on the upper periphery of the cavity 10. In these figures, the ball 2 was not represented.

Les découpes 13 sont interrompues au niveau des discontinuités des saillies 120, 121, 122, 123 pour dèlimiter des secteurs libres 14. The cuts 13 are interrupted at the discontinuities projections 120, 121, 122, 123 to delimit free sectors 14.

Sur les secteurs 14, le profil de la paroi interne du corps de pompe n'a pas été modifié et est donc lisse et continue, de façon à ne présenter aucun obstacle depuis l'intérieur jusqu'à l'extérieur de la cavité 10 pour permettre le libre passage du produit.On sectors 14, the profile of the internal wall of the body of pump has not been modified and is therefore smooth and continuous, so as not to present no obstacle from the inside to the outside of the cavity 10 to allow free passage of the product.

Les saillies 120, 121, 122, 123 sont ici centrées, de part et d'autre, sur deux diamètres perpendiculaires.The projections 120, 121, 122, 123 are here centered, on the one hand and on the other, on two perpendicular diameters.

Leurs bords intérieurs respectifs 120c, 121c,122c, 123c possèdent une longueur telle que les secteurs libres 14 intermédiaires correspondent à des portions d'angles α comprises entre 30° et 80°.Their respective inner edges 120c, 121c, 122c, 123c have a length such that the free sectors 14 intermediate correspond to portions of angles α between 30 ° and 80 °.

La pompe A de l'invention, et en particulier, le corps 1 de ladite pompe est réalisé de manière traditionnelle, par exemple, par moulage à injection de matière plastique ou thermoplastique.The pump A of the invention, and in particular, the body 1 of said pump is produced in a traditional way, for example, by molding injection of plastic or thermoplastic material.

On réalise ensuite en façonnant la paroi interne du corps 1, au moins une saillie interne 120 discontinue, et de préférence quatre saillies séparées par des secteurs libres, en façonnant la paroi interne du corps 1.Then, by shaping the internal wall of the body 1, minus one discontinuous internal projection 120, and preferably four projections separated by free sectors, shaping the inner wall of the body 1.

De préférence, on introduit la bille 2 dans la partie inférieure 1a du corps 1 préalablement au façonnage, lorsque la paroi interne est encore uniforme.Preferably, the ball 2 is introduced into the lower part 1a of the body 1 prior to shaping, when the internal wall is still uniform.

Toutefois, si la saillie interne 120 est élastiquement déformable et/ou flexible, il est alors possible de procéder à l'introduction de la bille après façonnage, par appui déformant sur ladite saillie.However, if the internal projection 120 is elastically deformable and / or flexible, it is then possible to introduce the ball after shaping, by deforming support on said projection.

Cette opération de façonnage ou de matriçage est effectuée au moyen d'un poinçon P tel que celui qui est représenté sur les figures 4a et 4b.This shaping or stamping operation is carried out by means of a punch P such as that shown in FIGS. 4a and 4b.

Le poinçon P comprend un mandrin M portant une tête T. Le mandrin M assure le centrage, le guidage et le calage du poinçon dans le corps de pompe pendant le façonnage.The punch P comprises a mandrel M carrying a head T. The mandrel M provides centering, guiding and setting of the punch in the pump body during shaping.

La tête T assure le façonnage du corps par translation axiale et forcée du mandrin M comme représenté sur la figure 5.The head T ensures the shaping of the body by axial translation and force of the mandrel M as shown in FIG. 5.

A cet effet, la tête T comporte au moins une, et ici quatre lames L destinées à repousser la matière sur la paroi du corps 1 au-dessus et autour de la bille 2, en formant les découpes 13, et les saillies 120, 121, 122, 123 comme représenté sur la figure 5. For this purpose, the head T comprises at least one, and here four blades L intended to repel the material on the wall of the body 1 above and around the ball 2, forming the cutouts 13, and the projections 120, 121, 122, 123 as shown in FIG. 5.

Le diamètre d de la tête est compris entre 110% et 140% du diamètre de la bilie pour une profondeur de pénétration d'environ 25% de l'épaisseur de la paroi du corpsThe diameter d of the head is between 110% and 140% of the bimetal diameter for a penetration depth of about 25% of the thickness of the body wall

La géométrie des lames L représentées en vue de dessous sur la figure 4b, détermine la géométrie ultérieure des découpes 13 des saillies 120, 121,122, 123 et des secteurs libres 14.The geometry of the blades L shown in bottom view on the Figure 4b, determines the subsequent geometry of the cutouts 13 of the projections 120, 121, 122, 123 and free sectors 14.

La face inférieure C des lames L agit par son bord extérieur à la manière d'un couteau ou d'une dent vis-à-vis de la matière plastique en la faisant fluer vers l'intérieur de la tête.The lower face C of the blades L acts by its edge outside the like a knife or a tooth vis-à-vis the plastic in causing it to flow towards the inside of the head.

La largeur et la longueur de la face inférieure C est déterminée au préalable en fonction des dimensions recherchées pour les saillies.The width and length of the underside C is determined beforehand depending on the dimensions sought for the projections.

La dimension transversale X des saillies à réaliser dépendra du volume de matière repoussé vers le bas et vers l'intérieur par chacune des lames L sur le pourtour intérieur de la cavité 10. Ce volume correspond donc au volume délimité par les découpes 13. Or, ce volume est lui-même fonction du diamètre de la tête T, de la largeur x de la face inférieure C et de la profondeur de pénétration, de la longueur angulaire y et de la hauteur h des lames L.The transverse dimension X of the projections to be produced will depend on the volume of material pushed down and inward by each blades L on the inner periphery of the cavity 10. This volume therefore corresponds to the volume delimited by the cutouts 13. However, this volume is itself a function of the diameter of the head T, of the width x the underside C and the depth of penetration, the length angular y and the height h of the blades L.

La face externe l des lames L est droite et parallèle à l'axe du mandrin M tandis que leur face interne l' est inclinée vers le mandrin M et vers le centre de la tête T avec un angle β voisin de 45° pour ne pas solliciter la bille lors du travail de la tête.The outer face l of the blades L is straight and parallel to the axis of the mandrel M while their internal face is inclined towards the mandrel M and towards the center of the head T with an angle β close to 45 ° so as not to use the ball when working the head.

Le mandrin M comporte une face E destinée à venir en butée contre un épaulement 1b du corps de pompe (voir figures 2a et 2b) pour limiter l'enfoncement de la tête T.The mandrel M has a face E intended to come into abutment against a shoulder 1b of the pump body (see Figures 2a and 2b) to limit the sinking of the T head.

Par conséquent, la position de la butée haute 12a, et donc, la course de la bille 2, sera déterminée en fonction de la hauteur h des lames L par rapport à la face E du mandrin.Consequently, the position of the upper stop 12a, and therefore, the stroke of ball 2, will be determined according to the height h of blades L with respect to the face E of the mandrel.

Claims (11)

  1. Pump of the type comprising a substantially cylindrical body (1) in one piece provided, in its lower part, with a port (11) for admission of the product and with a valve constituted by a cavity (10) containing an element (2) capable of moving between a lower stop (12b) corresponding to the obturation of said admission port (11) and an upper stop (12a) corresponding to the opening of said port (11), which is defined by at least one discontinuous internal projection (120) whose lower face (120b) partially closes said cavity and whose upper face (120a) is topped with, outside said cavity, an at least partly cylindrical cut-out (13) whose generatrices are parallel to the axis of the body (1),
    characterized in that said projection (120) presents an inner edge (120c) of which the generatrices are substantially parallel to the axis of the body (1), and which defines, upon joining the lower face (120b), a contact line with the mobile element (2) in the upper stop thus preventing said element from being stuck or sliding outside the cavity (10).
  2. Pump according to Claim 1, characterized in that said mobile element is a ball housed in a conico-cylindrical cavity (10) which radially abuts in the upper stop against a circular contact line borne by said projection (120).
  3. Pump according to one of the preceding Claims, characterized in that said cavity (10) presents an upper orifice (10a) laterally defined by the inner projection (12) and of which the inner diameter is included between 50% and 90% of the largest transverse dimension of the mobile element (2).
  4. Pump according to one of the preceding Claims, characterized in that the upper face (120a) of said projection (120) is wider than its lower face (120b).
  5. Pump according to one of the preceding Claims, characterized in that the upper stop (12a) comprises four projections (120, 121, 122, 123) diametrally opposite in two's.
  6. Pump according to Claim 5, characterized in that the four projections are separated, preferably by free sectors (14) capable of allowing the product to pass.
  7. Pump according to Claim 5, characterized in that the free sectors (14) present an angular length included between 30° and 80°.
  8. Process for manufacturing a pump according to one of the preceding Claims, with the pump body (1) being produced with at least one discontinuous internal projection (120) which is formed by fashioning the inner wall of said body by means of a punching die (P), characterised in that said projection (120) is fashioned with an inner edge (120c) whose generatrices are parallel to the axis of said body and which defines, upon joining the lower face (120b), a circular contact line with the mobile element (2) in the upper stop.
  9. Process according to Claim 8, characterized in that said body is internally fashioned by the punching die (P) pushing the material constituting the wall downwardly and inwardly so as partly to close the cavity (10).
  10. Process according to Claim 8 or 9, characterized in that said body (1) is internally fashioned by a punching die (P) incorporating four blades (L) diametrally opposite in two's.
  11. Process according to one of Claims 8 to 10, characterized in that the mobile element (2) is introduced in the lower part of the body (1) prior to the formation of said inner projection (120).
EP98941492A 1997-08-01 1998-07-30 Improvement to a pump body and method for making same Expired - Lifetime EP1000246B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9709861A FR2766879B1 (en) 1997-08-01 1997-08-01 IMPROVEMENT OF A PUMP BODY AND MANUFACTURING METHOD
FR9709861 1997-08-01
PCT/FR1998/001691 WO1999006701A1 (en) 1997-08-01 1998-07-30 Improvement to a pump body and method for making same

Publications (2)

Publication Number Publication Date
EP1000246A1 EP1000246A1 (en) 2000-05-17
EP1000246B1 true EP1000246B1 (en) 2001-10-24

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EP98941492A Expired - Lifetime EP1000246B1 (en) 1997-08-01 1998-07-30 Improvement to a pump body and method for making same

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US (1) US6343916B1 (en)
EP (1) EP1000246B1 (en)
JP (1) JP2001512214A (en)
CN (1) CN1097167C (en)
AT (1) ATE207578T1 (en)
AU (1) AU8985098A (en)
BR (1) BR9810848A (en)
CA (1) CA2299520A1 (en)
DE (1) DE69802195T2 (en)
DK (1) DK1000246T3 (en)
ES (1) ES2167925T3 (en)
FR (1) FR2766879B1 (en)
HK (1) HK1030446A1 (en)
PT (1) PT1000246E (en)
TW (1) TW408080B (en)
WO (1) WO1999006701A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2849477B1 (en) * 2002-12-26 2006-05-19 Rexam Dispensing Sys METHOD FOR INTEGRATING A BALLOVER RETURN VALVE IN A PUMP BODY
US9475607B2 (en) * 2008-10-01 2016-10-25 Rehrig Pacific Company Plastic beer keg
CA2752830C (en) * 2009-04-20 2018-01-02 Rehrig Pacific Company Plastic beer keg
US8967407B2 (en) * 2009-07-27 2015-03-03 Rehrig Pacific Company Plastic beer keg
US9434505B2 (en) * 2010-01-26 2016-09-06 Rehrig Pacific Company Plastic beer keg
BR112013000714A2 (en) 2010-07-12 2016-05-24 Illinois Tool Works filter set
US9045325B2 (en) 2010-11-09 2015-06-02 Rehrig Pacific Company Plastic beer keg
MX2011011908A (en) * 2010-11-09 2012-05-21 Rehrig Pacific Co Plastic beer keg.
CN103062038B (en) * 2011-10-21 2015-12-23 兴必盛塑业(南通)有限公司 Table type liquid pumps machine
FR2995801B1 (en) * 2012-09-27 2016-02-19 Rexam Dispensing Sys METHOD FOR PRODUCING A PUMP BODY FOR DISPENSING A FLUID PRODUCT
JP6319977B2 (en) * 2013-09-27 2018-05-09 スリーエム イノベイティブ プロパティズ カンパニー Capsule filter
CA2895614A1 (en) 2014-06-23 2015-12-23 Rehrig Pacific Company Plastic beer keg
CN108591032B (en) * 2018-07-06 2024-02-02 上海如迪流体输送设备有限公司 Sanitary pneumatic diaphragm pump

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US3044413A (en) * 1959-09-21 1962-07-17 Drackett Co Pump pistons
NO783258L (en) * 1977-09-27 1979-03-28 Unilever Nv PUMP DISPENSER.
US4197875A (en) * 1978-05-16 1980-04-15 Liquid Metronics Incorporated Ball check valve
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JP2826847B2 (en) * 1989-11-13 1998-11-18 株式会社吉野工業所 Method for forming valve chamber of cylinder member for liquid ejector
JPH03161006A (en) * 1989-11-17 1991-07-11 Hitachi Ltd Structure of adsorbing tower
JP2826848B2 (en) * 1989-11-21 1998-11-18 株式会社吉野工業所 Method for forming valve chamber of cylinder member for liquid ejector
FR2764005B1 (en) * 1997-05-29 2004-12-10 Sofab ARTICULATED PISTON PUMP
US6045008A (en) * 1998-04-30 2000-04-04 Calmar-Monturas, S.A. Fluid pump dispenser

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AU8985098A (en) 1999-02-22
HK1030446A1 (en) 2001-05-04
TW408080B (en) 2000-10-11
WO1999006701A1 (en) 1999-02-11
ATE207578T1 (en) 2001-11-15
EP1000246A1 (en) 2000-05-17
CA2299520A1 (en) 1999-02-11
DE69802195T2 (en) 2002-06-20
FR2766879B1 (en) 1999-10-22
FR2766879A1 (en) 1999-02-05
ES2167925T3 (en) 2002-05-16
CN1097167C (en) 2002-12-25
JP2001512214A (en) 2001-08-21
PT1000246E (en) 2002-04-29
BR9810848A (en) 2000-07-25
CN1269000A (en) 2000-10-04
US6343916B1 (en) 2002-02-05
DE69802195D1 (en) 2001-11-29
DK1000246T3 (en) 2002-02-18

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