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EP2579993B1 - Pump for delivering a product, comprising a piston sliding in the metering chamber - Google Patents

Pump for delivering a product, comprising a piston sliding in the metering chamber Download PDF

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Publication number
EP2579993B1
EP2579993B1 EP11735473.8A EP11735473A EP2579993B1 EP 2579993 B1 EP2579993 B1 EP 2579993B1 EP 11735473 A EP11735473 A EP 11735473A EP 2579993 B1 EP2579993 B1 EP 2579993B1
Authority
EP
European Patent Office
Prior art keywords
membrane
pump
support
product
skirt
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.)
Not-in-force
Application number
EP11735473.8A
Other languages
German (de)
French (fr)
Other versions
EP2579993A1 (en
Inventor
Xavier Donnette
José Camba
Philippe Sahm
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.)
Nemera la Verpilliere SAS
Original Assignee
Nemera la Verpilliere SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nemera la Verpilliere SAS filed Critical Nemera la Verpilliere SAS
Publication of EP2579993A1 publication Critical patent/EP2579993A1/en
Application granted granted Critical
Publication of EP2579993B1 publication Critical patent/EP2579993B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/0005Components or details
    • B05B11/0062Outlet valves actuated by the pressure of the fluid to be sprayed
    • B05B11/0075Two outlet valves being placed in a delivery conduit, one downstream the other
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-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
    • B05B11/10Pump 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
    • B05B11/1001Piston pumps
    • B05B11/1004Piston pumps comprising a movable cylinder and a stationary piston
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-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
    • B05B11/10Pump 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
    • B05B11/1042Components or details
    • B05B11/1066Pump inlet valves
    • B05B11/1067Pump inlet valves actuated by pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-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
    • B05B11/10Pump 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
    • B05B11/1042Components or details
    • B05B11/1066Pump inlet valves
    • B05B11/1067Pump inlet valves actuated by pressure
    • B05B11/1069Pump inlet valves actuated by pressure the valve being made of a resiliently deformable material or being urged in a closed position by a spring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/0005Components or details
    • B05B11/0062Outlet valves actuated by the pressure of the fluid to be sprayed
    • B05B11/0064Lift valves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/0005Components or details
    • B05B11/0062Outlet valves actuated by the pressure of the fluid to be sprayed
    • B05B11/0064Lift valves
    • B05B11/0067Lift valves having a valve seat located downstream the valve element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-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
    • B05B11/10Pump 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
    • B05B11/1001Piston pumps
    • B05B11/1016Piston pumps the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-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
    • B05B11/10Pump 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
    • B05B11/1042Components or details
    • B05B11/1043Sealing or attachment arrangements between pump and container
    • B05B11/1046Sealing or attachment arrangements between pump and container the pump chamber being arranged substantially coaxially to the neck of the container
    • B05B11/1047Sealing or attachment arrangements between pump and container the pump chamber being arranged substantially coaxially to the neck of the container the pump being preassembled as an independent unit before being mounted on the container

Definitions

  • the present invention relates to the technical field of the delivery of liquid product, semi-liquid or viscous especially in the medical field.
  • This device comprises a pump, for sucking and dispensing the product contained in a tank.
  • the device can be used in particular for nasal sprays.
  • the pump comprises an elastic membrane comprising a nonreturn valve-forming portion so as to prevent product reflux from the dosing chamber to the reservoir.
  • the elastic membrane is attached to a support through which a feed channel serves as a seat for the non-return valve portion so that the valve is pressed against the seat to block the liquid or remote from the seat to pass it.
  • the membrane is slidably mounted in the dosing chamber of the pump, in a sealed manner, to expel the product contained in the chamber from the chamber.
  • the elastic membrane comprises a transverse wall forming the valve for closing the supply channel of the chamber, and a cylindrical skirt provided with one or two peripheral sealing lips, in sliding contact with the inner wall of the chamber. dosing.
  • the documents FR 2,765,560 , FR 2,664,353 and FR 2 699 390 describe pumps and valves according to the prior art.
  • the present invention aims in particular to provide a pump delivering more precise doses.
  • the sealing function and the non-return valve function are provided by two parts, namely the membrane and the plating element, made of two different materials, rather than a single elastic part.
  • the material of each part can be adapted to the function associated with it, namely the function of the non-return valve for the membrane and that of plating or sliding in a metering chamber for the plating element.
  • the material of the plating element is more impervious to air than the membrane material, which avoids the introduction of air into the pump by diffusion of air through the material, especially through the cylindrical skirt.
  • the first material is relatively flexible and the second material is relatively rigid, that is to say that the material of the plating element is more rigid than the material of the membrane.
  • a flexible material such as for example silicone
  • the fact of using a less breathable material for the plating element avoids the introduction of air into the device, by diffusion through the walls of the plating element.
  • the membrane performs the function of a non-return valve satisfactorily because it is elastic. Indeed, it is thus flexible enough to be able to take a blocking configuration of the product, cooperating with the support, and a product passage configuration, the product blocking configuration preventing the return of the product inside the channel of the product.
  • the sealing means are made of rigid material, the sliding between these means and the wall of the metering chamber is done with less friction and thus generates less wear of the sealing means. while requiring less force from the user to operate the pump.
  • a piece of rigid material may be less likely to react with the product, and also allows better control of dimensions and therefore a more accurate adjustment of the different parts relative to each other in the chamber of dosage.
  • the pump shown above is particularly interesting when operating without air intake.
  • This type of pump is generally called an "airless pump".
  • the priming of the pump that is to say that the air contained in the metering chamber is completely replaced by the product to be delivered
  • the product expelled from the tank with each use is not replaced by air coming from outside.
  • a vacuum is formed within the tank which can cause leaks and / or aspirations of air in the device, and cause the entry of gas by diffusion through the walls of the device.
  • This introduction of air is troublesome because in this case, the metering chamber or the dip tube immersed in the tank are no longer only filled with product, which alters the accuracy of the product doses delivered and causes a slight defusing of the pump .
  • the plating element is made of a material different from the membrane, it is possible to choose a material having a lower air permeability than the material of the membrane, so that the diffusion of air through the element of plating is as low as possible and that the introduction of air into the metering chamber is almost non-existent.
  • the introduction of air into the metering chamber is negligible, the doses provided are particularly accurate, and for a long time.
  • the volume delivered by the pump will always be substantially constant, even if it is not activated after a long period (for example 5 or 7 , days)
  • Another advantage of the pump proposed above lies in the fact that the plating element and the membrane are inserts relative to each other, that is to say they are manufactured separately and that they do not form a single piece. They could, if necessary, be disassembled independently of one another. Indeed, it is more interesting to mount the two separate parts in the pump than to achieve directly by being integral with each other (for example by gluing, overmolding or by bi-injection), the fact that these parts are of particularly small size, and that the bonding by gluing, overmoulding or bi-injection is delicate and can cause leaks.
  • the membrane is held on the support so that a portion of the membrane is sandwiched between the support and the plating element on the membrane.
  • the elastic deformation of the membrane has no effect on the plating element and therefore on the sealing means, this membrane being simply plated, in a deformed state, against the support by the element. plating.
  • An additional advantage of making the membrane and the plating element separately is that the geometry of the membrane can be very easily varied depending on the product delivered. Indeed, one can increase or reduce its deformation on the support, so the force required for product release. It is thus easy to adapt the pump to the viscosity of the product to be delivered. It is therefore easier to optimize the membrane and the plating element.
  • the membrane when it is in the product blocking configuration, is preferably elastically deformed, so that it closes the passage under the effect of its elastic return.
  • the membrane undergoes additional deformation, under the effect of the depression in the metering chamber, corresponding to an amplification of the deformation provided in the locking configuration, so as to detach support to let the product through.
  • the piston is slidably mounted in the metering chamber between a rest position, also called low position, and an activated position, also called high position.
  • the dosing chamber thus defines a dosing volume, corresponding to the difference between a volume of the chamber in the low position and a volume of the chamber in the high position, also called "dead volume”.
  • a product delivery device 10 comprising a pump 12 surmounted by a product dispensing tip 14.
  • the device is used for example for nasal sprays of pharmaceutical product.
  • This pump 12 is intended to be mounted on a reservoir (not shown).
  • the pump 12 comprises a first portion 16, said fixed portion, and a second portion 18, said movable portion or dispensing head, movable relative to the fixed portion 16.
  • the fixed portion 16 of the pump 12 comprises a pump body 20 comprising an outer cylinder 22 connected to an inner cylinder 24 for receiving a dip tube 26.
  • the dip tube 26 is immersed in the reservoir when the device is mounted on it to draw from the product to be delivered.
  • the pump body 20 carries a piston 28 attached to the inner cylinder 24.
  • the fixed portion 16 of the pump comprises a clamping collar 30, for crimping the pump 12 on the tank.
  • the pump 12 may be mounted on the tank by screwing or snapping (also called "snap-on").
  • the piston 28 comprises a support 32, a membrane 34 forming a non-return valve and a member 36 for plating the membrane 34 on the support 32.
  • the support 32 has a generally tubular shape and is fixedly mounted on the inner cylinder 24. It is traversed by a feed channel 38, arranged in the extension of the tube 26, and opening onto a supply port provided on the upper end of the support.
  • the support 32 may be integrally molded with the pump body 20, and be constituted by the inner cylinder 24, the feed channel 38 can then be constituted by all or part of the inner cylinder 24.
  • the upper end of the support 32 is capped by the membrane 34 and defines a bearing seat 40 of this membrane 34. The membrane 34 is pressed by elastic deformation against the seat 40 by the plating element 36.
  • FIG. 2 a perspective view of an embodiment of the membrane is presented. It comprises a central disc 42 carrying means forming a non-return valve by cooperation with the support 32 and a positioning edge 44 connected to the disc 42 by a perforated wall 46 passing the product.
  • the positioning edge 44 has an annular shape.
  • the positioning edge 44 may have discontinuities 48, as shown in FIG. figure 4 ; it does not necessarily have a continuous annular shape.
  • the positioning edge 44 makes it possible to press the central disk 42 against the support seat 40 of the support 32 by elastic deformation of the membrane 34 and more particularly of the perforated wall 46.
  • the elastic deformation of the membrane 34 is obtained by supporting a plating surface 50 of the plating element 36 on the positioning edge 44 of the membrane 34.
  • the plating surface 50 deforms the membrane 34 by moving the positioning edge 44 towards the support 32 and holds the membrane 34 in product blocking configuration.
  • the membrane 34 is made of a relatively flexible and elastic material, for example: silicone, propylene / ethylene copolymers, polyether blockamides, polyvinyl, terpolymer of ethylene, propylene and a diene (EPDM), sequenced styrene-butadiene polymer (SBS), sequenced styrene-ethylene-butadiene polymer (SEBS-SIS), polyurethane, butyl rubber or nitrile rubber; in latex, fluorinated elastomers or polypropylene blend with one of the following elastomers: styrene-ethylene-butadiene block polymers (SEBS-SIS), terpolymers of ethylene, propylene and a diene (EPDM), polymers sequenced styrene-butadiene (SBS).
  • silicone silicone
  • propylene / ethylene copolymers polyether blockamides
  • the plating element 36 may be made of less permeable material than the elastic material of the membrane, for example: high or low density polyethylene, polypropylene, polyester, polyacetal, ethylene vinyl acetate or mixtures thereof.
  • the material of the plating element 36 which is less permeable to air, is more rigid than that of the membrane 34.
  • this material is not necessarily more rigid. could be simply different from the material of the membrane 34, preferably more impervious to air.
  • the element of plating 36 comprises a skirt 52 and a perforated transverse wall 54 integrally formed with the skirt 52.
  • the skirt 52 carries on its upper end a revolution lip 56 which may, for example, be of frustoconical shape and extend towards the end upper part of the pump, the narrowest part being at the lower end of the lip, that is to say that it forms with the skirt a "V" whose opening is turned towards the upper part of the pump.
  • This lip 56 forms the first sealing means of the pump.
  • the transverse wall 54 has a solid central portion 58 and, in the present case, two orifices 60 for product passage.
  • the skirt 52 of the plating element 36 comprises means 62 for fixing the plating element on the support 32.
  • these fastening means 62 are embodied by an annular groove carried by the inner wall of the skirt 52 which cooperate, snap-fastening, with lugs 64 or an annular rib 64 made on the support.
  • lugs 64 can be provided.
  • the lugs or the rib can be integral with the support 32.
  • the means 62 and 64 also make it possible to center and plating the plating element. 36 on the support 32.
  • the support 32 comprises a cylindrical outer surface carrying second sealing means, ensuring the sealing attachment of the plating element 36 on the support 32.
  • These second sealing means 66 can, for example, be an annular rib which, by deformation of the inner wall of the plating element, ensures the sealing of the assembly. It is further noted that the support 32 comprises a shoulder 68 against which the lower end of the skirt 52 abuts.
  • the plating element 36 carries, on the inner surface of the transverse wall 54, a centering rib 94 which makes it possible to ensure easy and rapid centering of the membrane 34 and the plating element 36.
  • the support 32, the membrane 34 and the plating element 36 are separate parts.
  • the moving part 18 of the pump comprises a first cylinder 70, slidably mounted inside the pump body 20, and delimiting, with the piston 28, more precisely with the plating element 36, the metering chamber 72.
  • the piston 28 is slidably mounted in the first cylinder 70, therefore in the metering chamber 72.
  • the sealing sliding of the piston 28, therefore of the plating element 36, in the metering chamber 72 is ensured by the first ones sealing means 56 carried by the skirt 52 of the plating element 36.
  • the chamber 72 defines a dosing volume, corresponding to the difference between the volume of the chamber 72 when the piston 32 is in the up position and the volume of the chamber 72 when the piston 32 is in the low position. This dosing volume determines the dose of product delivered at each activation of the device.
  • the movable portion 18 further comprises a second cylinder 74, made in one piece with the first cylinder 70.
  • the cylinders 70 and 74 can be made of several parts.
  • a needle 76 is slidably mounted inside this second cylinder 74, between a rest position and an activated position, under the action of first return means 78, composed of a compression spring.
  • the needle 76 is provided with a base 76a, mounted in a sealed manner in the second cylinder 74, of a rod 76b, configured to be able to close, in the rest position of the pump, an orifice 80 formed on the lower end of the second cylinder 74, and an end 76c, projecting slightly inside the metering chamber 72 when the needle 76 is in the activated position.
  • This end 76c is configured to press the solid central portion 58 of the plating element 36 when the movable portion 18 is in the activated position, so as to guarantee the opening of the orifice 80 during the priming phase of the device, so as to push the air from the metering chamber 72 to the top of the device.
  • the movable portion 18 further comprises an element 82, fixedly mounted relative to the first 70 and second 74 cylinders, and delimiting a distribution chamber 84.
  • the element 82 could be made in one piece with the elements 70 and / or 74. It is generally on the element 82 that the dispensing nozzle 14 of the device is mounted, the chamber 84 being connected to a dispensing nozzle provided on this nozzle. Note that the chamber 84 is not necessarily present on the support 82, it can be provided only a connection of the support 82 and / or the cylinder 74 with the dispensing nozzle 14.
  • the element 82 of the movable part 18 is provided with an inner skirt 86 and an outer skirt 88, between which second return means 90 are housed.
  • the return means 90 are composed of a spring in compression, bearing on the one hand on the element 82, between the two skirts 86, 88, on the other hand on the fixed part 16, at the bottom of a sleeve 92. With the spring 90, the movable portion 18, movable relative to the fixed portion 16 between a rest position and an activated position, is held in the up position, as shown in FIG. figure 1 . Inside the inner skirt 86, the element 82 also has a bearing seat of the first spring 78.
  • the element 82 further comprises means ensuring the passage of the liquid from the metering chamber 72 to the dispensing tip 14, specifically to the chamber dispensing 84, arranged in particular between the second cylinder 74 and the inner skirt 86, preferably so as to ensure the passage of liquid without the liquid being in contact with the return means 78 and 90.
  • This device further comprises a dispensing nozzle 14 comprising a casing 98 comprising a duct 100 opening in its upper part on a spray orifice 102 of small diameter.
  • a needle 104 inserted into a swirl chamber 106 of the conduit 100, valve distribution form. All of the needle 104, vortex chamber 106 and spray port 102 form a spray nozzle.
  • the needle 104 closes the spray orifice 102 and is held in this position by return means 108 which bear on the lower end of the needle 104 and on a seat carried by the element 110.
  • the envelope also comprises fingertips 112 which allow the user to operate the device.
  • the membrane 34 is placed inside the plating element 36.
  • the diaphragm 34 can be seen in the undeformed state.
  • These two elements are then brought back to the upper end of the support 32 or vice versa.
  • These three parts are firmly held together by snapping the annular rib 64 of the support 32 in the groove 62 carried by the inner surface of the skirt 52.
  • the proper positioning of the membrane 34 and the plating element 36 is ensured by above the cooperation of the groove 62 and the rib 64, by abutment of the lower end of the skirt 52 against the shoulder 68 of the support 32.
  • the plating surface 50 elastically deforms the membrane 34, and more particularly the perforated wall 46, and plates the central disc 42 against the support seat 40 of the support 32 in the product blocking configuration, as shown in FIG. figure 4 .
  • the membrane 34 is thus sandwiched between the support 32 and the plating element 36.
  • the piston 28 is then attached to the pump body 20 on which the dip tube 26 is mounted.
  • the moving part of the pump formed by the first 70 and second 74 cylinders, the needle 76, the element 82, the sleeve 92 and the springs 78 and 90 is then assembled.
  • the various elements are held together by mechanical clamping or by snapping.
  • This subassembly is then attached to the fixed part 16 of the pump.
  • the pump fixing system is then brought back to the reservoir, in this case a crimp ring 30. It would also be possible to provide a screw ring or a snap-on system also called "snap-on".
  • the last step is to assemble the different parts forming the dispensing tip and to bring them back to the pump.
  • the wall of the distribution chamber 84 is engaged in a housing carried by the lower end of the element 110 of the dispensing nozzle.
  • the tip may itself be capped by a protective cover (not shown).
  • the device 10 is ready to be mounted on a reservoir by crimping the clamp 30 on the neck of the reservoir.
  • the lower end of the dip tube 26 When mounted on the reservoir, the lower end of the dip tube 26 is immersed in the product to be dispensed.
  • the movable portion 18 of the pump Before the first use, the movable portion 18 of the pump is in the up position, or rest position, and the metering chamber 72 is filled with air.
  • the membrane 34 is pressed against the support 32 in the product blocking configuration.
  • the spring 78 exerts on the needle 76 a force which holds the needle in the closed configuration of the orifice 80 by cooperation with the rod 76b and the spring 90 keeps the movable portion 18 of the pump in the up position.
  • the user presses on the mobile part 18 of the pump and more particularly on the finger-holders 112 of the dispensing nozzle 14 by exerting a force going from the top to the bottom (schematized by arrow 96). Under the action of this force, the mobile part descends and compresses the air contained in the metering chamber 72.
  • the end 76c of the needle 76 abuts against the solid central portion 58 of the plating element 36
  • the stem 76b of the needle no longer closes the orifice 80 of the second cylinder 74 and the air can escape freely in the upper part of the device; the moving part 18 is then in the low position, or activated position, and the metering chamber 72 has its minimum volume.
  • the spring 90 drives the movable portion upwards in the opposite direction to that of the arrow 96 and the spring 78 recalls the needle 76 in the orifice closure configuration.
  • 80 which causes a depression in the metering chamber 72. This depression causes the separation of the central disk of the membrane 34 of the support 32, by elastic deformation of the membrane 34 and more particularly of the perforated wall 46 and or disk central 42: the membrane 34 is then in product passage configuration. In this configuration, the deformation experienced by the membrane 34 corresponds to an amplification of the deformation provided in blocking configuration, so as to detach from the support 32 to let the product.
  • the product can therefore cross the non-return valve, pass through the orifices of the perforated wall 46 and enter the metering chamber 72.
  • the additional deformation of the membrane 34 is limited by the solid central portion 58 of the wall transverse 54 of the plating element 36. Thus, the removal of the membrane is avoided.
  • the movable portion 18 is again in the up position, the metering chamber 72 is filled with product and the membrane 34 is again pressed against the support 32 in the product blocking configuration.
  • the product contained can not escape from the metering chamber, nor the air enter because the seal is provided by the first 56 sealing means, between the first cylinder 70 of the movable part, and by the second means sealing member 66 between the support 32 and the plating element 36.
  • the membrane 34 forming a non-return valve and the needle 76 are in the product blocking configuration.
  • the user When the user wishes to deliver a dose of product, as before, he actuates the device by exerting a force from above downwards on the finger rest 112 (in the direction of the arrow 96), under the action of this force, the moving part 18 and therefore the first 70 and second 74 cylinders begin to descend, the volume of the metering chamber 72 decreases and puts the product it contains under pressure.
  • This product can not escape to the reservoir or out of the pump thanks to the first 56 and second 64 sealing means and the membrane 34 forming a non-return valve. It therefore exerts an upward pressure on the needle 76, so that the rod 76b is displaced and no longer occludes the orifice 80. The product can thus escape from the chamber 72.
  • the product Once the product has passed through the orifice 80, it flows between the second cylinder 74 and the inner skirt 86 via a channel 114 arranged in the wall of the second cylinder. It then passes into the dispensing chamber 84 to the dispensing nozzle 14. Through channels arranged in the element 110, the liquid flows between the vortex chamber 106 and the duct 100 and between the vortex chamber and the needle 106. The product exerts a downward pressure on the needle 106 which, moving in the direction of the arrow 96, allows the product to be sprayed through the spray orifice 102.
  • the moving part 18 Once the moving part 18 has reached its low position, that is to say once the dose of product has been dispensed, the user releases is resting on the moving part 18 and the metering chamber 72 fills up. again product as previously described.
  • the skirt 52 is made of a material that is less permeable to air than the material of the membrane, and that as a result, the diffusion of air through its wall is particularly weak. where better accuracy in the delivered doses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Reciprocating Pumps (AREA)

Description

La présente invention concerne le domaine technique de la délivrance de produit liquide, semi-liquide ou visqueux notamment dans le domaine médical. Ce dispositif comprend une pompe, permettant d'aspirer et distribuer du produit contenu dans un réservoir. Le dispositif peut être utilisé en particulier pour des pulvérisations nasales.The present invention relates to the technical field of the delivery of liquid product, semi-liquid or viscous especially in the medical field. This device comprises a pump, for sucking and dispensing the product contained in a tank. The device can be used in particular for nasal sprays.

Selon un exemple de pompe décrit dans le document FR 2 885 890 , la pompe comprend une membrane élastique comprenant un partie formant une valve anti-retour de façon à empêcher le reflux de produit depuis la chambre de dosage vers le réservoir. La membrane élastique est rapportée sur un support traversé par un canal d'alimentation, servant de siège à la partie formant valve anti-retour de sorte que la valve soit plaquée contre le siège pour bloquer le liquide ou distante du siège pour le laisser passer. La membrane est montée coulissante dans la chambre de dosage de la pompe, de façon étanche, pour expulser hors de la chambre du produit contenu dans la chambre. Plus précisément, la membrane élastique comprend une paroi transversale formant la valve pour obturer le canal d'alimentation de la chambre, et une jupe cylindrique pourvue d'une ou deux lèvres périphériques d'étanchéité, en contact coulissant avec la paroi interne de la chambre de dosage. Les documents FR 2 765 560 , FR 2 664 353 et FR 2 699 390 décrivent pompes et valves selon l'art antérieur.According to an example of a pump described in the document FR 2,885,890 the pump comprises an elastic membrane comprising a nonreturn valve-forming portion so as to prevent product reflux from the dosing chamber to the reservoir. The elastic membrane is attached to a support through which a feed channel serves as a seat for the non-return valve portion so that the valve is pressed against the seat to block the liquid or remote from the seat to pass it. The membrane is slidably mounted in the dosing chamber of the pump, in a sealed manner, to expel the product contained in the chamber from the chamber. More specifically, the elastic membrane comprises a transverse wall forming the valve for closing the supply channel of the chamber, and a cylindrical skirt provided with one or two peripheral sealing lips, in sliding contact with the inner wall of the chamber. dosing. The documents FR 2,765,560 , FR 2,664,353 and FR 2 699 390 describe pumps and valves according to the prior art.

On sait par ailleurs que certaines pompes sont configurées pour délivrer du produit sans reprise d'air, ce qui permet notamment d'éviter d'utiliser des conservateurs. Dans de tels dispositifs en particulier, toute introduction d'air dans la pompe ou le réservoir se fait au détriment de la précision des doses délivrées ou de la stérilité du produit délivré.It is also known that certain pumps are configured to deliver the product without air intake, which allows in particular to avoid the use of preservatives. In such devices in particular, any introduction of air into the pump or reservoir is detrimental to the accuracy of the doses delivered or the sterility of the delivered product.

La présente invention vise notamment à proposer une pompe délivrant des doses plus précises.The present invention aims in particular to provide a pump delivering more precise doses.

A cet effet, la présente invention a pour objet une pompe pour la délivrance d'un produit, comportant un piston monté coulissant dans une chambre de dosage, le piston comportant

  • un support,
  • une membrane formant valve anti-retour, laissant passer du produit dans la chambre de dosage, réalisée dans un premier matériau, caractérisée en ce que ledit piston comporte
  • un élément de plaquage de la membrane contre le support, comportant une jupe portant des moyens d'étanchéité assurant le coulissement étanche du piston dans la chambre de dosage, l'élément de plaquage étant réalisé dans un second matériau différent du premier matériau de la membrane, étant rapporté sur la membrane, et comprenant une surface de plaquage de la membrane, qui maintient la membrane déformée contre le support pour assurer une fermeture de la valve anti-retour.
For this purpose, the subject of the present invention is a pump for dispensing a product, comprising a piston slidably mounted in a metering chamber, the piston comprising
  • a support,
  • a membrane forming a non-return valve, allowing the product to pass through the metering chamber, made of a first material, characterized in that said piston comprises
  • an element for plating the membrane against the support, comprising a skirt carrying sealing means ensuring the sliding of the piston in the metering chamber, the plating element being made of a second material different from the first material of the membrane; , being attached to the membrane, and comprising a plating surface of the membrane, which keeps the membrane deformed against the support to ensure closure of the non-return valve.

Ainsi on propose que la fonction d'étanchéité et la fonction de valve anti-retour soient assurées par deux pièces, à savoir la membrane et l'élément de plaquage, réalisées dans deux matériaux distincts, plutôt que par une unique pièce élastique. Ainsi, on peut adapter le matériau de chaque pièce à la fonction qui lui est associée, à savoir la fonction de valve anti-retour pour la membrane et celle de plaquage ou de coulissement dans une chambre de dosage pour l'élément de plaquage. De préférence, le matériau de l'élément de plaquage est davantage imperméable à l'air que le matériau de la membrane, ce qui évite l'introduction d'air dans la pompe par diffusion de l'air à travers le matériau, tout particulièrement à travers la jupe cylindrique.Thus it is proposed that the sealing function and the non-return valve function are provided by two parts, namely the membrane and the plating element, made of two different materials, rather than a single elastic part. Thus, the material of each part can be adapted to the function associated with it, namely the function of the non-return valve for the membrane and that of plating or sliding in a metering chamber for the plating element. Preferably, the material of the plating element is more impervious to air than the membrane material, which avoids the introduction of air into the pump by diffusion of air through the material, especially through the cylindrical skirt.

Selon un mode de réalisation avantageux, le premier matériau est relativement souple et le second matériau est relativement rigide, c'est-à-dire que le matériau de l'élément de plaquage est plus rigide que le matériau de la membrane. En effet, un matériau souple, tel que par exemple le silicone, est relativement perméable à l'air, du fait que les molécules d'air peuvent facilement diffuser à travers le matériau. Aussi, le fait d'utiliser un matériau moins perméable à l'air pour l'élément de plaquage évite l'introduction d'air dans le dispositif, par diffusion à travers les parois de l'élément de plaquage. Par ailleurs, la membrane assure la fonction de valve anti-retour de façon satisfaisante du fait qu'elle est élastique. En effet, elle est ainsi suffisamment souple pour pouvoir prendre une configuration de blocage du produit, en coopérant avec le support, et une configuration de passage du produit, la configuration de blocage du produit empêchant le retour du produit à l'intérieur du canal d'alimentation une fois que le produit est dans la chambre de dosage. Ces deux fonctions assurent un bon fonctionnement de la pompe et fournissent donc un dispositif plus fiable. De plus, comme les moyens d'étanchéité sont en matériau rigide, le coulissement entre ces moyens et la paroi de la chambre de dosage se fait avec moins de frictions et génère donc moins d'usure des moyens d'étanchéité tout en requérant une force moins importante de l'utilisateur pour actionner la pompe. En outre, une pièce en matériau rigide peut être moins susceptible de réagir au contact du produit, et permet par ailleurs un meilleur contrôle des dimensions et donc un ajustement plus précis des différentes pièces l'une par rapport à l'autre dans la chambre de dosage.According to an advantageous embodiment, the first material is relatively flexible and the second material is relatively rigid, that is to say that the material of the plating element is more rigid than the material of the membrane. Indeed, a flexible material, such as for example silicone, is relatively permeable to air, because the air molecules can easily diffuse through the material. Also, the fact of using a less breathable material for the plating element avoids the introduction of air into the device, by diffusion through the walls of the plating element. Furthermore, the membrane performs the function of a non-return valve satisfactorily because it is elastic. Indeed, it is thus flexible enough to be able to take a blocking configuration of the product, cooperating with the support, and a product passage configuration, the product blocking configuration preventing the return of the product inside the channel of the product. once the product is in the dosing chamber. These two functions ensure a smooth operation of the pump and thus provide a more reliable device. In addition, since the sealing means are made of rigid material, the sliding between these means and the wall of the metering chamber is done with less friction and thus generates less wear of the sealing means. while requiring less force from the user to operate the pump. In addition, a piece of rigid material may be less likely to react with the product, and also allows better control of dimensions and therefore a more accurate adjustment of the different parts relative to each other in the chamber of dosage.

La pompe présentée ci-dessus est particulièrement intéressante lorsqu'elle fonctionne sans reprise d'air. Ce type de pompe est généralement appelé « pompe airless ». Dans une telle pompe, une fois l'amorçage de la pompe réalisé, c'est-à-dire que l'air contenu dans la chambre de dosage est entièrement remplacé par du produit à délivrer, le produit expulsé hors du réservoir à chaque utilisation n'est pas remplacé par de l'air venant de l'extérieur. De ce fait, au fur et à mesure de l'utilisation, il se forme, au sein du réservoir, une dépression qui peut engendrer des fuites et/ou des aspirations d'air dans le dispositif, et provoquer l'entrée de gaz par diffusion à travers les parois du dispositif. Cette introduction d'air est gênante car dans ce cas, la chambre de dosage ou le tube plongeur immergé dans le réservoir ne sont plus uniquement remplis de produit, ce qui altère la précision des doses de produit délivrées et engendre un léger désamorçage de la pompe. Cette introduction d'air croît par ailleurs avec le temps, si bien que la précision des doses diminue avec le temps. Comme l'élément de plaquage est en matériau différent de la membrane, on peut choisir un matériau ayant une perméabilité à l'air plus faible que celle du matériau de la membrane, de sorte que la diffusion d'air à travers l'élément de plaquage soit la plus faible possible et que l'introduction d'air dans la chambre de dosage soit quasi inexistante. Ainsi, l'introduction d'air dans la chambre de dosage étant négligeable, les doses fournies sont particulièrement précises, et ce sur une longue durée. Ainsi, compte tenu de la très faible quantité de gaz qui peut pénétrer dans le système, le volume délivré par la pompe sera toujours sensiblement constant, même si celle-ci n'est pas activée après une longue période (par exemple 5, voire 7, jours)The pump shown above is particularly interesting when operating without air intake. This type of pump is generally called an "airless pump". In such a pump, once the priming of the pump, that is to say that the air contained in the metering chamber is completely replaced by the product to be delivered, the product expelled from the tank with each use is not replaced by air coming from outside. As a result, as and when used, a vacuum is formed within the tank which can cause leaks and / or aspirations of air in the device, and cause the entry of gas by diffusion through the walls of the device. This introduction of air is troublesome because in this case, the metering chamber or the dip tube immersed in the tank are no longer only filled with product, which alters the accuracy of the product doses delivered and causes a slight defusing of the pump . This introduction of air also increases over time, so that the precision of the doses decreases with time. Since the plating element is made of a material different from the membrane, it is possible to choose a material having a lower air permeability than the material of the membrane, so that the diffusion of air through the element of plating is as low as possible and that the introduction of air into the metering chamber is almost non-existent. Thus, the introduction of air into the metering chamber is negligible, the doses provided are particularly accurate, and for a long time. Thus, given the very small amount of gas that can enter the system, the volume delivered by the pump will always be substantially constant, even if it is not activated after a long period (for example 5 or 7 , days)

Un autre avantage de la pompe proposée ci-dessus réside dans le fait que l'élément de plaquage et la membrane sont des éléments rapportés l'un par rapport à l'autre, c'est-à-dire qu'ils sont fabriqués séparément et qu'ils ne forment pas une pièce d'un seul tenant. Ils pourraient, si nécessaire, être démontés indépendamment l'un de l'autre. En effet, il est plus intéressant de monter les deux pièces séparées dans la pompe que de les réaliser directement en étant solidaires l'une par rapport à l'autre (par exemple par collage, surmoulage ou encore par bi-injection), du fait que ces pièces sont de dimension particulièrement petite, et que la solidarisation par collage, surmoulage ou bi-injection est délicate et peut engendrer des fuites. Par ailleurs, la membrane est maintenue sur le support de telle sorte qu'une partie de la membrane est prise en sandwich entre le support et l'élément de plaquage sur la membrane. En outre, comme les pièces sont séparées, il n'y a pas d'interférences entre la fonction de valve anti-retour et la fonction d'étanchéité, interférences que l'on pourrait retrouver lorsque ces deux fonctions sont assurées par une pièce d'un seul tenant. De fait, la déformation élastique de la membrane n'a pas d'effet sur l'élément de plaquage et donc, sur les moyens d'étanchéité, cette membrane étant simplement plaquée, dans un état déformé, contre le support par l'élément de plaquage. Un avantage supplémentaire de réaliser la membrane et l'élément de plaquage séparément réside dans le fait que l'on peut très facilement modifier la géométrie de la membrane en fonction du produit délivré. En effet, on peut augmenter ou réduire sa déformation sur le support, donc la force requise pour la libération de produit. On peut ainsi facilement adapter la pompe à la viscosité du produit à délivrer. On peut donc plus facilement optimiser la membrane et l'élément de plaquage.Another advantage of the pump proposed above lies in the fact that the plating element and the membrane are inserts relative to each other, that is to say they are manufactured separately and that they do not form a single piece. They could, if necessary, be disassembled independently of one another. Indeed, it is more interesting to mount the two separate parts in the pump than to achieve directly by being integral with each other (for example by gluing, overmolding or by bi-injection), the fact that these parts are of particularly small size, and that the bonding by gluing, overmoulding or bi-injection is delicate and can cause leaks. In addition, the membrane is held on the support so that a portion of the membrane is sandwiched between the support and the plating element on the membrane. In addition, as the parts are separated, there is no interference between the non-return valve function and the sealing function, interference that could be found when these two functions are provided by a part d one piece. In fact, the elastic deformation of the membrane has no effect on the plating element and therefore on the sealing means, this membrane being simply plated, in a deformed state, against the support by the element. plating. An additional advantage of making the membrane and the plating element separately is that the geometry of the membrane can be very easily varied depending on the product delivered. Indeed, one can increase or reduce its deformation on the support, so the force required for product release. It is thus easy to adapt the pump to the viscosity of the product to be delivered. It is therefore easier to optimize the membrane and the plating element.

On notera que la membrane, lorsqu'elle est en configuration de blocage de produit, est de préférence déformée élastiquement, de sorte qu'elle est obture le passage sous l'effet de son rappel élastique. Lorsqu'elle est dans la configuration de passage de produit, la membrane subit une déformation supplémentaire, sous l'effet de la dépression dans la chambre de dosage, correspondant à une amplification de la déformation assurée en configuration de blocage, de façon à se détacher du support pour laisser passer le produit.It will be noted that the membrane, when it is in the product blocking configuration, is preferably elastically deformed, so that it closes the passage under the effect of its elastic return. When it is in the product passage configuration, the membrane undergoes additional deformation, under the effect of the depression in the metering chamber, corresponding to an amplification of the deformation provided in the locking configuration, so as to detach support to let the product through.

De manière générale, on qualifie de supérieur tout ce qui est disposé du côté de l'embout de distribution de produit et d'inférieur tout ce qui est disposé du côté du réservoir sur lequel la pompe est montée. On notera par ailleurs que le piston est monté coulissant dans la chambre de dosage entre une position de repos, appelée aussi position basse, et une position activée, appelée aussi position haute. La chambre de dosage définit ainsi un volume de dosage, correspondant à la différence entre un volume de la chambre en position basse et un volume de la chambre en position haute, également appelé « volume mort ».Generally speaking, everything that is arranged on the side of the product dispensing nozzle and all that is arranged on the side of the reservoir on which the pump is mounted is described as superior. Note also that the piston is slidably mounted in the metering chamber between a rest position, also called low position, and an activated position, also called high position. The dosing chamber thus defines a dosing volume, corresponding to the difference between a volume of the chamber in the low position and a volume of the chamber in the high position, also called "dead volume".

La pompe peut en outre comporter l'une ou plusieurs des caractéristiques suivantes.

  • La membrane est réalisée en silicone, en copolymères propylène/éthylène, en polyéther blocamides, en polyvinyle, en terpolymère d'éthylène, de propylène et d'un diène (EPDM), en polymère de styrène-butadiène séquencés (SBS), en polymère de styrène-éthylène-butadiène séquencés (SEBS-SIS), en polyuréthane, en caoutchoucs de butyle ou de nitrile ; en latex, en élastomères fluorés ou en mélange de polypropylène avec l'un des élastomères suivants : polymères de styrène-éthylène-butadiène séquencés (SEBS-SIS), terpolymères d'éthylène, de propylène et d'un diène (EPDM), polymères de styrène-butadiène séquencés (SBS). On notera que le silicone est particulièrement avantageux du fait qu'il présente une bonne résistance au fluage (ses propriétés se conservent bien au cours du temps, même lorsqu'il est sous contrainte), une bonne inertie chimique et une bonne aptitude à être démoulé par injection.
  • L'élément de plaquage est réalisé en polyéthylène haute ou basse densité, en polypropylène, en polyester, en polyacétal, en éthylène vinyl acétate ou leurs mélanges qui sont des matériaux ayant une perméabilité à l'air plus faible et qui permettent donc de s'assurer un temps de reprise d'air de plusieurs jours. De plus, les moyens d'étanchéité coulissants portés par la jupe sont venus de matière avec la jupe de l'élément de plaquage, ce qui assure l'étanchéité à l'air de la chambre de dosage.
  • La jupe comprend une extrémité supérieure et une extrémité inférieure et les moyens d'étanchéité coulissants sont portés par l'extrémité supérieure de la jupe, et comprennent par exemple une lèvre de révolution. Du fait que la lèvre est disposée en haut de la jupe, le volume mort de la chambre de dosage est réduit et l'on optimise l'amorçage de la pompe. De plus, la lèvre de révolution peut, par exemple, être de forme tronconique s'étendant vers l'extrémité supérieure de la pompe, la partie la plus étroite étant à l'extrémité inférieure de la lèvre, c'est-à-dire former avec la jupe un « V » dont l'ouverture est tournée vers la partie supérieure de la pompe. De ce fait, lorsque l'utilisateur actionne la pompe et comprime le liquide contenu dans la chambre de dosage, la pression du liquide augmente la force qui plaque cette lèvre contre les parois intérieures de la chambre de dosage ce qui augmente son étanchéité tout en minimisant les surfaces de contact. Ces moyens d'étanchéité peuvent également prendre la forme d'un bourrelet annulaire ou de tout autre forme permettant de réaliser l'étanchéité.
  • La membrane comprend un disque central portant des moyens formant valve anti-retour par coopération avec le support, et un bord de positionnement raccordé au disque par une paroi ajourée laissant passer le produit. Le bord de positionnement est plaqué contre la surface de plaquage de l'élément de plaquage. On comprend qu'en configuration de blocage du produit, le disque de la membrane est de préférence plaqué par retour élastique contre le support, plus précisément contre l'extrémité supérieure du support, formant un siège, et sous l'effet de la pression du produit contenu dans la chambre de dosage. Par ailleurs en configuration de passage du produit, le disque se soulève par rapport au siège, principalement par déformation élastique de la paroi ajourée, sous l'effet de la dépression créée lorsque le piston passe de la position haute à la position basse, de façon à créer un espace de passage du produit. On notera que le bord de positionnement peut être un anneau mais n'est pas forcément un anneau continu, il a pour fonction de positionner la membrane à une certaine hauteur par rapport au support, de façon que le disque reste plaqué contre le siège pour fermer la valve. Le bord de positionnement est maintenu à cette hauteur grâce à la surface de plaquage de l'élément de plaquage qui exerce une pression sur le bord. On notera qu'en modifiant l'épaisseur ou la forme du bord de positionnement, on peut modifier très simplement la déformation de la membrane et donc faire varier la pression requise pour ouvrir la valve.
  • Le support comprend une surface extérieure sensiblement cylindrique portant des seconds moyens d'étanchéité, permettant une fixation étanche de la jupe sur le support. Ces seconds moyens d'étanchéité évitent le passage de liquide ou d'air entre le support et l'élément de plaquage. Ils peuvent être par exemple une lèvre ou un bourrelet annulaires faisant le tour de la surface extérieure du support. Ils peuvent également être confondus avec des moyens de fixation de la jupe sur le support. Ainsi, l'étanchéité de la chambre de dosage par rapport au corps de pompe est garantie par l'élément de plaquage, qui est de préférence rigide. On notera que le piston proposé ici n'a besoin d'assurer que deux étanchéités entre des pièces pour éviter des fuites entre l'intérieur et l'extérieur de la pompe, à savoir l'étanchéité coulissante entre l'élément de plaquage et la chambre, assurée par les premiers moyens, et l'étanchéité entre l'élément de plaquage et le support, assurée par les seconds moyens. En effet, il n'est pas nécessaire de prévoir une étanchéité entre la membrane et l'élément de plaquage, ce qui facilite le montage et fournit un dispositif plus fiable.
  • Le support comprend un épaulement contre lequel l'extrémité inférieure de la jupe vient en butée. De ce fait, on positionne verticalement l'élément de plaquage, donc la membrane, par rapport au support de manière permanente, et l'on garantit donc un fonctionnement satisfaisant de la valve. De plus, on peut prévoir une griffe qui exerce un effort sur une surface tronconique prévue sur le support, créant ainsi un effort qui plaque l'élément de plaquage contre le support et maintient donc plus sûrement la position axiale.
  • L'élément de plaquage comporte des moyens de fixation sur le support par encliquetage, comprenant une rainure coopérant avec un ergot ou une nervure annulaire réalisés sur le support.
  • L'élément de plaquage comporte une paroi transversale venue de matière avec la jupe, comprenant une partie centrale pleine. Cette partie centrale permet de préférence de limiter le débattement de la membrane et éviter qu'elle se désolidarise ou se déchausse du support par déformation trop importante de la membrane. Selon un mode de réalisation particulièrement avantageux, un pointeau supérieur obturant la chambre de dosage peut venir en butée sur cette partie centrale lors de l'amorçage de la pompe, et permettre ainsi une évacuation de l'air contenu dans la chambre de dosage.
  • La pompe fonctionne sans reprise d'air.
The pump may further include one or more of the following features.
  • The membrane is made of silicone, propylene / ethylene copolymers, polyether blockamides, polyvinyl, terpolymer of ethylene, propylene and a diene (EPDM), polymer styrene-butadiene sequenced (SBS), polymer sequenced styrene-ethylene-butadiene (SEBS-SIS), polyurethane, butyl rubber or nitrile rubber; in latex, fluorinated elastomers or polypropylene blend with one of the following elastomers: styrene-ethylene-butadiene block polymers (SEBS-SIS), terpolymers of ethylene, propylene and a diene (EPDM), polymers sequenced styrene-butadiene (SBS). Note that the silicone is particularly advantageous because it has good creep resistance (its properties are well preserved over time, even when under stress), good chemical inertness and good ability to be removed from the mold by injection.
  • The plating element is made of high or low density polyethylene, polypropylene, polyester, polyacetal, ethylene vinyl acetate or mixtures thereof which are materials having a lower air permeability and therefore allow ensure a return air time of several days. In addition, the sliding sealing means carried by the skirt are integral with the skirt of the plating element, which ensures airtightness of the metering chamber.
  • The skirt comprises an upper end and a lower end and the sliding sealing means are carried by the upper end of the skirt, and comprise for example a lip of revolution. Because the lip is disposed at the top of the skirt, the dead volume of the metering chamber is reduced and the priming of the pump is optimized. In addition, the lip of revolution may, for example, be of frustoconical shape extending towards the upper end of the pump, the narrowest part being at the lower end of the lip, that is to say form with the skirt a "V" whose opening is turned towards the upper part of the pump. Therefore, when the user actuates the pump and compresses the liquid contained in the metering chamber, the liquid pressure increases the force that the lip plate against the inner walls of the metering chamber which increases its sealing while minimizing the contact surfaces. These sealing means may also take the form of an annular bead or any other form for sealing.
  • The membrane comprises a central disk carrying means forming a non-return valve in cooperation with the support, and a positioning edge connected to the disk by a perforated wall passing the product. The positioning edge is pressed against the plating surface of the plating element. It is understood that in the product blocking configuration, the disk of the membrane is preferably pressed by elastic return against the support, more precisely against the upper end of the support, forming a seat, and under the effect of the pressure of the product contained in the dosing chamber. Furthermore, in the product passage configuration, the disc is raised relative to the seat, mainly by elastic deformation of the perforated wall, under the effect of the depression created when the piston passes from the high position to the low position, so that to create a space of passage of the product. Note that the positioning edge may be a ring but is not necessarily a continuous ring, it has the function of positioning the membrane at a certain height relative to the support, so that the disc remains pressed against the seat to close the valve. The positioning edge is maintained at this height due to the plating surface of the plating member which exerts pressure on the edge. It will be noted that by modifying the thickness or the shape of the positioning edge, it is possible to very simply modify the deformation of the membrane and thus to vary the pressure required to open the valve.
  • The support comprises a substantially cylindrical outer surface carrying second sealing means, allowing tight attachment of the skirt on the support. These second sealing means prevent the passage of liquid or air between the support and the plating element. They may be for example an annular lip or bead circling the outer surface of the support. They can also be confused with fastening means of the skirt on the support. Thus, the sealing of the metering chamber with respect to the pump body is ensured by the plating element, which is preferably rigid. Note that the piston proposed here needs to ensure only two sealing between parts to prevent leakage between the inside and the outside of the pump, namely the sliding seal between the plating element and the chamber, provided by the first means, and the seal between the plating element and the support, provided by the second means. Indeed, it is not necessary to provide a seal between the membrane and the plating element, which facilitates assembly and provides a more reliable device.
  • The support comprises a shoulder against which the lower end of the skirt abuts. As a result, the plating element, thus the membrane, is positioned vertically relative to the support in a permanent manner, and satisfactory operation of the valve is thus ensured. In addition, it is possible to provide a claw which exerts a force on a frustoconical surface provided on the support, thus creating a force which plates the plating element against the support and thus more surely maintains the axial position.
  • The plating element comprises fastening means on the snap-fastening support, comprising a groove cooperating with a lug or an annular rib formed on the support.
  • The plating element comprises a transverse wall integral with the skirt, comprising a solid central portion. This central portion preferably makes it possible to limit the deflection of the membrane and to prevent it from becoming detached or unstuck from the support by excessive deformation of the membrane. According to a particularly advantageous embodiment, an upper needle closing the metering chamber can abut on this central portion during the priming of the pump, and thus allow an evacuation of the air contained in the metering chamber.
  • The pump operates without air intake.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins dans lesquels :

  • la figure 1 est une vue en coupe d'un dispositif pour la délivrance de produit selon un mode de réalisation ;
  • la figure 2 est une vue en perspective de la membrane selon un mode de réalisation ;
  • la figure 3 est une vue en perspective de l'élément de plaquage selon un mode de réalisation ;
  • la figure 4 est une vue en coupe agrandie de la partie supérieure du piston selon un mode de réalisation ;
  • les figures 5 et 6 sont des vues en coupe de la partie fixe de la pompe à différents moments de l'assemblage ;
The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the drawings in which:
  • the figure 1 is a sectional view of a device for the product delivery according to an embodiment;
  • the figure 2 is a perspective view of the membrane according to one embodiment;
  • the figure 3 is a perspective view of the plating member according to one embodiment;
  • the figure 4 is an enlarged sectional view of the upper portion of the piston according to one embodiment;
  • the Figures 5 and 6 are sectional views of the fixed part of the pump at different moments of the assembly;

On a représenté sur la figure 1 un dispositif 10 de délivrance de produit comprenant une pompe 12 surmontée d'un embout 14 de distribution de produit. Le dispositif est utilisé par exemple pour des pulvérisations nasales de produit pharmaceutique. Cette pompe 12 est destinée à être montée sur un réservoir (non représenté).We have shown on the figure 1 a product delivery device 10 comprising a pump 12 surmounted by a product dispensing tip 14. The device is used for example for nasal sprays of pharmaceutical product. This pump 12 is intended to be mounted on a reservoir (not shown).

La pompe 12 comprend une première partie 16, dite partie fixe, et une seconde partie 18, dite partie mobile ou tête de distribution, mobile par rapport à la partie fixe 16.The pump 12 comprises a first portion 16, said fixed portion, and a second portion 18, said movable portion or dispensing head, movable relative to the fixed portion 16.

De préférence, la partie fixe 16 de la pompe 12 comporte un corps de pompe 20 comprenant un cylindre extérieur 22 raccordé à un cylindre intérieur 24 de réception d'un tube plongeur 26. Le tube plongeur 26 est immergé dans le réservoir lorsque le dispositif est monté dessus afin de puiser du produit à délivrer. Le corps de pompe 20 porte un piston 28 rapporté sur le cylindre intérieur 24. Par ailleurs, la partie fixe 16 de la pompe comprend un collier de fixation 30, permettant de sertir la pompe 12 sur le réservoir. Alternativement, la pompe 12 peut étalement être montée sur le réservoir par vissage ou par encliquetage (aussi appelé « snap-on »).Preferably, the fixed portion 16 of the pump 12 comprises a pump body 20 comprising an outer cylinder 22 connected to an inner cylinder 24 for receiving a dip tube 26. The dip tube 26 is immersed in the reservoir when the device is mounted on it to draw from the product to be delivered. The pump body 20 carries a piston 28 attached to the inner cylinder 24. Furthermore, the fixed portion 16 of the pump comprises a clamping collar 30, for crimping the pump 12 on the tank. Alternatively, the pump 12 may be mounted on the tank by screwing or snapping (also called "snap-on").

Le piston 28 comprend un support 32, une membrane 34 formant valve anti-retour et un élément 36 de plaquage de la membrane 34 sur le support 32.The piston 28 comprises a support 32, a membrane 34 forming a non-return valve and a member 36 for plating the membrane 34 on the support 32.

Dans cet exemple, le support 32 a une forme globalement tubulaire et est monté fixe sur le cylindre intérieur 24. Il est traversé par un canal d'alimentation 38, agencé dans le prolongement du tube 26, et débouchant sur un orifice d'alimentation prévu sur l'extrémité supérieure du support. De façon alternative, le support 32 peut être venu de moulage avec le corps de pompe 20, et être constitué par le cylindre intérieur 24, le canal d'alimentation 38 pouvant alors être constitué par tout ou une partie du cylindre intérieur 24. L'extrémité supérieure du support 32 est coiffée par la membrane 34 et définit un siège d'appui 40 de cette membrane 34. La membrane 34 est plaquée par déformation élastique contre le siège 40 par l'élément de plaquage 36.In this example, the support 32 has a generally tubular shape and is fixedly mounted on the inner cylinder 24. It is traversed by a feed channel 38, arranged in the extension of the tube 26, and opening onto a supply port provided on the upper end of the support. Alternatively, the support 32 may be integrally molded with the pump body 20, and be constituted by the inner cylinder 24, the feed channel 38 can then be constituted by all or part of the inner cylinder 24. The upper end of the support 32 is capped by the membrane 34 and defines a bearing seat 40 of this membrane 34. The membrane 34 is pressed by elastic deformation against the seat 40 by the plating element 36.

Sur la figure 2, on présente une vue en perspective d'un mode de réalisation de la membrane. Elle comporte un disque central 42 portant des moyens formant valve anti-retour par coopération avec le support 32 et un bord de positionnement 44 raccordé au disque 42 par une paroi ajourée 46 laissant passer le produit. Dans ce mode de réalisation, le bord de positionnement 44 a une forme annulaire.On the figure 2 a perspective view of an embodiment of the membrane is presented. It comprises a central disc 42 carrying means forming a non-return valve by cooperation with the support 32 and a positioning edge 44 connected to the disc 42 by a perforated wall 46 passing the product. In this embodiment, the positioning edge 44 has an annular shape.

La membrane 34 n'ayant pas pour fonction d'assurer l'étanchéité entre le support 32 et l'élément de plaquage 36, le bord de positionnement 44 peut comporter des discontinuités 48, comme représenté sur la figure 4 ; il n'a pas forcément une forme annulaire continue. Le bord de positionnement 44 permet de plaquer le disque central 42 contre le siège d'appui 40 du support 32 par déformation élastique de la membrane 34 et plus particulièrement de la paroi ajourée 46. La déformation élastique de la membrane 34 est obtenue par appui d'une surface de plaquage 50 de l'élément de plaquage 36 sur le bord de positionnement 44 de la membrane 34. Préférentiellement, la surface de plaquage 50 déforme la membrane 34 en déplaçant le bord de positionnement 44 vers le support 32 et maintient la membrane 34 en configuration de blocage de produit.Since the membrane 34 does not have the function of sealing between the support 32 and the plating element 36, the positioning edge 44 may have discontinuities 48, as shown in FIG. figure 4 ; it does not necessarily have a continuous annular shape. The positioning edge 44 makes it possible to press the central disk 42 against the support seat 40 of the support 32 by elastic deformation of the membrane 34 and more particularly of the perforated wall 46. The elastic deformation of the membrane 34 is obtained by supporting a plating surface 50 of the plating element 36 on the positioning edge 44 of the membrane 34. Preferably, the plating surface 50 deforms the membrane 34 by moving the positioning edge 44 towards the support 32 and holds the membrane 34 in product blocking configuration.

La membrane 34 est réalisée dans un matériau relativement souple et élastique, par exemple : en silicone, en copolymères propylène/éthylène, en polyéther blocamides, en polyvinyle, en terpolymère d'éthylène, de propylène et d'un diène (EPDM), en polymère de styrène-butadiène séquencés (SBS), en polymère de styrène-éthylène-butadiène séquencés (SEBS-SIS), en polyuréthane, en caoutchoucs de butyle ou de nitrile ; en latex, en élastomères fluorés ou en mélange de polypropylène avec l'un des élastomères suivants : polymères de styrène-éthylène-butadiène séquencés (SEBS-SIS), terpolymères d'éthylène, de propylène et d'un diène (EPDM), polymères de styrène-butadiène séquencés (SBS).The membrane 34 is made of a relatively flexible and elastic material, for example: silicone, propylene / ethylene copolymers, polyether blockamides, polyvinyl, terpolymer of ethylene, propylene and a diene (EPDM), sequenced styrene-butadiene polymer (SBS), sequenced styrene-ethylene-butadiene polymer (SEBS-SIS), polyurethane, butyl rubber or nitrile rubber; in latex, fluorinated elastomers or polypropylene blend with one of the following elastomers: styrene-ethylene-butadiene block polymers (SEBS-SIS), terpolymers of ethylene, propylene and a diene (EPDM), polymers sequenced styrene-butadiene (SBS).

L'élément de plaquage 36 peut être réalisé en matériau moins perméable que le matériau élastique de la membrane, par exemple : en polyéthylène haute ou basse densité, en polypropylène, en polyester, en polyacétal, en éthylène vinyl acétate ou leurs mélanges.The plating element 36 may be made of less permeable material than the elastic material of the membrane, for example: high or low density polyethylene, polypropylene, polyester, polyacetal, ethylene vinyl acetate or mixtures thereof.

Dans cet exemple, le matériau de l'élément de plaquage 36, moins perméable à l'air, est plus rigide que celui de la membrane 34. Néanmoins, selon d'autres exemple, ce matériau n'est pas forcément plus rigide, il pourrait être simplement différent du matériau de la membrane 34, de préférence plus imperméable à l'air.In this example, the material of the plating element 36, which is less permeable to air, is more rigid than that of the membrane 34. However, according to other examples, this material is not necessarily more rigid. could be simply different from the material of the membrane 34, preferably more impervious to air.

Selon un mode de réalisation représenté sur les figures 3 et 4, l'élément de plaquage 36 comporte une jupe 52 et une paroi transversale 54 ajourée venue de matière avec la jupe 52. La jupe 52 porte sur son extrémité supérieure une lèvre de révolution 56 pouvant, par exemple, être de forme tronconique et s'étendre vers l'extrémité supérieure de la pompe, la partie la plus étroite étant à l'extrémité inférieure de la lèvre, c'est-à-dire qu'elle forme avec la jupe un « V » dont l'ouverture est tournée vers la partie supérieure de la pompe. Cette lèvre 56 forme les premiers moyens d'étanchéité de la pompe. La paroi transversale 54 comporte une partie centrale pleine 58 et, dans le cas présent, deux orifices 60 de passage de produit.According to an embodiment shown on the Figures 3 and 4 , the element of plating 36 comprises a skirt 52 and a perforated transverse wall 54 integrally formed with the skirt 52. The skirt 52 carries on its upper end a revolution lip 56 which may, for example, be of frustoconical shape and extend towards the end upper part of the pump, the narrowest part being at the lower end of the lip, that is to say that it forms with the skirt a "V" whose opening is turned towards the upper part of the pump. This lip 56 forms the first sealing means of the pump. The transverse wall 54 has a solid central portion 58 and, in the present case, two orifices 60 for product passage.

On peut également voir sur la figure 4 que la jupe 52 de l'élément de plaquage 36 comporte des moyens 62 de fixation de l'élément de plaquage sur le support 32. Dans le cas présent, ces moyens de fixation 62 sont matérialisés par une rainure annulaire portée par la paroi interne de la jupe 52 qui coopèrent, par encliquetage, avec des ergots 64 ou une nervure annulaire 64 réalisés sur le support. Bien sûr, on peut ne prévoir qu'un seul ergot 64. Les ergots ou la nervure peuvent être venus de matière avec le support 32. Les moyens 62 et 64 permettent également d'assurer le centrage et le plaquage de l'élément de plaquage 36 sur le support 32. De plus, le support 32 comprend une surface extérieure cylindrique portant des seconds moyens d'étanchéité, assurant la fixation étanche de l'élément de plaquage 36 sur le support 32. Ces seconds moyens d'étanchéité 66 peuvent, par exemple, être une nervure annulaire qui, par déformation de la paroi interne de l'élément de plaquage, assure l'étanchéité du montage. On constate en outre que le support 32 comprend un épaulement 68 contre lequel l'extrémité inférieure de la jupe 52 vient en butée. L'élément de plaquage 36 porte, sur la surface interne de la paroi transversale 54, une nervure de centrage 94 qui permet d'assurer un centrage facile et rapide de la membrane 34 et de l'élément de plaquage 36.We can also see on the figure 4 that the skirt 52 of the plating element 36 comprises means 62 for fixing the plating element on the support 32. In the present case, these fastening means 62 are embodied by an annular groove carried by the inner wall of the skirt 52 which cooperate, snap-fastening, with lugs 64 or an annular rib 64 made on the support. Of course, only one lug 64 can be provided. The lugs or the rib can be integral with the support 32. The means 62 and 64 also make it possible to center and plating the plating element. 36 on the support 32. In addition, the support 32 comprises a cylindrical outer surface carrying second sealing means, ensuring the sealing attachment of the plating element 36 on the support 32. These second sealing means 66 can, for example, be an annular rib which, by deformation of the inner wall of the plating element, ensures the sealing of the assembly. It is further noted that the support 32 comprises a shoulder 68 against which the lower end of the skirt 52 abuts. The plating element 36 carries, on the inner surface of the transverse wall 54, a centering rib 94 which makes it possible to ensure easy and rapid centering of the membrane 34 and the plating element 36.

Le support 32, la membrane 34 et l'élément de plaquage 36 sont des pièces distinctes.The support 32, the membrane 34 and the plating element 36 are separate parts.

La partie mobile 18 de la pompe comprend un premier cylindre 70, monté coulissant à l'intérieur du corps de pompe 20, et délimitant, avec le piston 28, plus précisément avec l'élément de plaquage 36, la chambre de dosage 72. En d'autres termes, le piston 28 est monté coulissant dans le premier cylindre 70, donc dans la chambre de dosage 72. Le coulissement étanche du piston 28, donc de l'élément de plaquage 36, dans la chambre de dosage 72 est assuré par les premiers moyens d'étanchéité 56 portés par la jupe 52 de l'élément de plaquage 36.The moving part 18 of the pump comprises a first cylinder 70, slidably mounted inside the pump body 20, and delimiting, with the piston 28, more precisely with the plating element 36, the metering chamber 72. in other words, the piston 28 is slidably mounted in the first cylinder 70, therefore in the metering chamber 72. The sealing sliding of the piston 28, therefore of the plating element 36, in the metering chamber 72 is ensured by the first ones sealing means 56 carried by the skirt 52 of the plating element 36.

La chambre 72 définit un volume de dosage, correspondant à la différence entre le volume de la chambre 72 lorsque le piston 32 est en position haute et le volume de la chambre 72 lorsque le piston 32 est en position basse. Ce volume de dosage détermine la dose de produit délivré à chaque activation du dispositif.The chamber 72 defines a dosing volume, corresponding to the difference between the volume of the chamber 72 when the piston 32 is in the up position and the volume of the chamber 72 when the piston 32 is in the low position. This dosing volume determines the dose of product delivered at each activation of the device.

La partie mobile 18 comporte par ailleurs un second cylindre 74, réalisé d'une seule pièce avec le premier cylindre 70. Bien sûr, les cylindres 70 et 74 peuvent être réalisés en plusieurs pièces. Un pointeau 76 est monté coulissant à l'intérieur de ce second cylindre 74, entre une position de repos et une position activée, sous l'action de premiers moyens de rappel 78, composés d'un ressort en compression. Le pointeau 76 est muni d'une base 76a, montée de façon étanche dans le second cylindre 74, d'une tige 76b, configurée pour pouvoir obturer, en position de repos de la pompe, un orifice 80 ménagé sur l'extrémité inférieure du second cylindre 74, et d'une extrémité 76c, faisant légèrement saillie à l'intérieur de la chambre de dosage 72 lorsque le pointeau 76 est en position activée. Cette extrémité 76c est configurée pour appuyer sur la partie centrale pleine 58 de l'élément de plaquage 36 lorsque la partie mobile 18 est en position activée, de façon à garantir l'ouverture de l'orifice 80 en phase d'amorçage du dispositif, donc de façon à pousser l'air de la chambre de dosage 72 vers le haut du dispositif.The movable portion 18 further comprises a second cylinder 74, made in one piece with the first cylinder 70. Of course, the cylinders 70 and 74 can be made of several parts. A needle 76 is slidably mounted inside this second cylinder 74, between a rest position and an activated position, under the action of first return means 78, composed of a compression spring. The needle 76 is provided with a base 76a, mounted in a sealed manner in the second cylinder 74, of a rod 76b, configured to be able to close, in the rest position of the pump, an orifice 80 formed on the lower end of the second cylinder 74, and an end 76c, projecting slightly inside the metering chamber 72 when the needle 76 is in the activated position. This end 76c is configured to press the solid central portion 58 of the plating element 36 when the movable portion 18 is in the activated position, so as to guarantee the opening of the orifice 80 during the priming phase of the device, so as to push the air from the metering chamber 72 to the top of the device.

La partie mobile 18 comporte par ailleurs un élément 82, monté fixe par rapport aux premier 70 et second 74 cylindres, et délimitant une chambre de distribution 84. Bien sûr, l'élément 82 pourrait être réalisé d'une seule pièce avec les éléments 70 et/ou 74. C'est généralement sur l'élément 82 qu'est monté l'embout de distribution 14 du dispositif, la chambre 84 étant reliée à une buse de distribution prévue sur cet embout. On notera que la chambre 84 n'est pas forcément présente sur le support 82, on peut prévoir seulement une connexion du support 82 et/ou du cylindre 74 avec l'embout de distribution 14. L'élément 82 de la partie mobile 18 est muni d'une jupe interne 86 et d'une jupe externe 88, entre lesquelles des deuxièmes moyens de rappel 90 sont logés. Les moyens de rappel 90 sont composés d'un ressort en compression, prenant appui d'une part sur l'élément 82, entre les deux jupes 86, 88, d'autre part sur la partie fixe 16, au fond d'un manchon 92. Grâce au ressort 90, la partie mobile 18, mobile par rapport à la partie fixe 16 entre une position de repos et une position activée, est maintenue en position haute, comme cela est représenté sur la figure 1. A l'intérieur de la jupe interne 86, l'élément 82 présente par ailleurs un siège d'appui du premier ressort 78. L'élément 82 comprend de plus des moyens assurant le passage du liquide depuis la chambre de dosage 72 vers l'embout de distribution 14, plus précisément vers la chambre de distribution 84, agencés notamment entre le second cylindre 74 et la jupe interne 86, de préférence de façon à assurer le passage de liquide sans que ce liquide ne soit en contact avec les moyens de rappel 78 et 90.The movable portion 18 further comprises an element 82, fixedly mounted relative to the first 70 and second 74 cylinders, and delimiting a distribution chamber 84. Of course, the element 82 could be made in one piece with the elements 70 and / or 74. It is generally on the element 82 that the dispensing nozzle 14 of the device is mounted, the chamber 84 being connected to a dispensing nozzle provided on this nozzle. Note that the chamber 84 is not necessarily present on the support 82, it can be provided only a connection of the support 82 and / or the cylinder 74 with the dispensing nozzle 14. The element 82 of the movable part 18 is provided with an inner skirt 86 and an outer skirt 88, between which second return means 90 are housed. The return means 90 are composed of a spring in compression, bearing on the one hand on the element 82, between the two skirts 86, 88, on the other hand on the fixed part 16, at the bottom of a sleeve 92. With the spring 90, the movable portion 18, movable relative to the fixed portion 16 between a rest position and an activated position, is held in the up position, as shown in FIG. figure 1 . Inside the inner skirt 86, the element 82 also has a bearing seat of the first spring 78. The element 82 further comprises means ensuring the passage of the liquid from the metering chamber 72 to the dispensing tip 14, specifically to the chamber dispensing 84, arranged in particular between the second cylinder 74 and the inner skirt 86, preferably so as to ensure the passage of liquid without the liquid being in contact with the return means 78 and 90.

Ce dispositif comporte, en outre, un embout de distribution 14 comportant une enveloppe 98 comprenant un conduit 100 débouchant dans sa partie supérieure sur un orifice de pulvérisation 102 de faible diamètre. Un pointeau 104, inséré dans une chambre tourbillonnaire 106 du conduit 100, forme clapet de distribution. L'ensemble du pointeau 104, de la chambre tourbillonnaire 106 et de l'orifice de pulvérisation 102 forment buse de pulvérisation. Le pointeau 104 obture l'orifice de pulvérisation 102 et est maintenu dans cette position par des moyens de rappel 108 qui prennent appui sur l'extrémité inférieure du pointeau 104 et sur un siège porté par l'élément 110. L'enveloppe comprend également des appui-doigts 112 qui permettent à l'utilisateur d'actionner le dispositif.This device further comprises a dispensing nozzle 14 comprising a casing 98 comprising a duct 100 opening in its upper part on a spray orifice 102 of small diameter. A needle 104, inserted into a swirl chamber 106 of the conduit 100, valve distribution form. All of the needle 104, vortex chamber 106 and spray port 102 form a spray nozzle. The needle 104 closes the spray orifice 102 and is held in this position by return means 108 which bear on the lower end of the needle 104 and on a seat carried by the element 110. The envelope also comprises fingertips 112 which allow the user to operate the device.

Le montage d'une telle pompe, qui comprend l'assemblage de trois sous-ensembles la partie fixe 16, la partie mobile 18 et l'embout de distribution 14, va à présent être décrit.The mounting of such a pump, which comprises the assembly of three sub-assemblies the fixed portion 16, the movable portion 18 and the dispensing nozzle 14, will now be described.

Tout d'abord, l'assemblage du piston 28 est décrit. Comme représenté sur la figure 5, on vient placer la membrane 34 à l'intérieur de l'élément de plaquage 36. On peut voir la membrane 34 à l'état non déformé. On vient ensuite rapporter ces deux éléments sur l'extrémité supérieure du support 32 ou inversement. Ces trois pièces sont fermement maintenues ensemble par encliquetage de la nervure annulaire 64 du support 32 dans la rainure 62 portée par la surface intérieure de la jupe 52. Le bon positionnement de la membrane 34 et de l'élément de plaquage 36 est assuré, en sus de la coopération de la rainure 62 et de la nervure 64, par la mise en butée de l'extrémité inférieure de la jupe 52 contre l'épaulement 68 du support 32. Lorsque l'élément de plaquage 36 est fixé sur le support 32, la surface de plaquage 50 vient déformer élastiquement la membrane 34, et plus particulièrement la paroi ajourée 46, et plaque le disque central 42 contre le siège d'appui 40 du support 32 en configuration de blocage de produit, comme représenté sur la figure 4. La membrane 34 est donc prise en sandwich entre le support 32 et l'élément de plaquage 36.First, the assembly of the piston 28 is described. As shown on the figure 5 the membrane 34 is placed inside the plating element 36. The diaphragm 34 can be seen in the undeformed state. These two elements are then brought back to the upper end of the support 32 or vice versa. These three parts are firmly held together by snapping the annular rib 64 of the support 32 in the groove 62 carried by the inner surface of the skirt 52. The proper positioning of the membrane 34 and the plating element 36 is ensured by above the cooperation of the groove 62 and the rib 64, by abutment of the lower end of the skirt 52 against the shoulder 68 of the support 32. When the plating element 36 is fixed on the support 32 , the plating surface 50 elastically deforms the membrane 34, and more particularly the perforated wall 46, and plates the central disc 42 against the support seat 40 of the support 32 in the product blocking configuration, as shown in FIG. figure 4 . The membrane 34 is thus sandwiched between the support 32 and the plating element 36.

Le piston 28 est ensuite rapporté sur le corps de pompe 20 sur lequel est monté le tube plongeur 26.The piston 28 is then attached to the pump body 20 on which the dip tube 26 is mounted.

On assemble ensuite la partie mobile de la pompe formée des premiers 70 et second 74 cylindres, du pointeau 76, de l'élément 82, du manchon 92 et des ressorts 78 et 90. Les différents éléments sont retenus entre-eux par serrage mécanique ou par encliquetage. Ce sous-ensemble est ensuite rapporté sur la partie fixe 16 de la pompe. On vient ensuite rapporter le système de fixation de la pompe sur le réservoir, dans le cas présent, une bague à sertir 30. On pourrait également prévoir une bague de vissage ou un système d'encliquetage aussi appelé « snap-on ».The moving part of the pump formed by the first 70 and second 74 cylinders, the needle 76, the element 82, the sleeve 92 and the springs 78 and 90 is then assembled. The various elements are held together by mechanical clamping or by snapping. This subassembly is then attached to the fixed part 16 of the pump. The pump fixing system is then brought back to the reservoir, in this case a crimp ring 30. It would also be possible to provide a screw ring or a snap-on system also called "snap-on".

La dernière étape consiste à assembler les différentes pièces formant l'embout de distribution et à venir les rapporter sur la pompe. Dans l'exemple décrit, la paroi de la chambre de distribution 84 vient s'emboiter dans un logement porté par l'extrémité inférieure de l'élément 110 de l'embout de distribution. L'embout peut lui-même être coiffé par un capot de protection (non représenté). Le dispositif 10 est prêt à être monté sur un réservoir par sertissage du collier de serrage 30 sur le col du réservoir.The last step is to assemble the different parts forming the dispensing tip and to bring them back to the pump. In the example described, the wall of the distribution chamber 84 is engaged in a housing carried by the lower end of the element 110 of the dispensing nozzle. The tip may itself be capped by a protective cover (not shown). The device 10 is ready to be mounted on a reservoir by crimping the clamp 30 on the neck of the reservoir.

Bien sûr, les différentes étapes d'assemblage présentées ci-dessus peuvent prendre d'autres formes ou être mises en oeuvre dans un ordre différent.Of course, the different assembly steps presented above can take other forms or be implemented in a different order.

Le fonctionnement du dispositif 10 assemblé sur le réservoir va à présent être décrit.The operation of the device 10 assembled on the reservoir will now be described.

Lorsqu'il est monté sur le réservoir, l'extrémité inférieure du tube plongeur 26 est immergée dans le produit à distribuer.When mounted on the reservoir, the lower end of the dip tube 26 is immersed in the product to be dispensed.

Avant la première utilisation, la partie mobile 18 de la pompe est en position haute, ou position de repos, et la chambre de dosage 72 est remplie d'air. La membrane 34 est plaquée contre le support 32 en configuration de blocage de produit. Le ressort 78 exerce, sur le pointeau 76, une force qui maintient le pointeau en configuration de fermeture de l'orifice 80 par coopération avec la tige 76b et le ressort 90 maintient la partie mobile 18 de la pompe en position haute.Before the first use, the movable portion 18 of the pump is in the up position, or rest position, and the metering chamber 72 is filled with air. The membrane 34 is pressed against the support 32 in the product blocking configuration. The spring 78 exerts on the needle 76 a force which holds the needle in the closed configuration of the orifice 80 by cooperation with the rod 76b and the spring 90 keeps the movable portion 18 of the pump in the up position.

Lors de la première utilisation du dispositif 10, l'utilisateur appuie sur la partie mobile 18 de la pompe et plus particulièrement sur les appui-doigts 112 de l'embout de distribution 14 en exerçant une force allant du haut vers le bas (schématisé par la flèche 96). Sous l'action de cette force, la partie mobile descend et comprime l'air contenu dans la chambre de dosage 72. Ensuite, l'extrémité 76c du pointeau 76 vient en butée contre la partie centrale pleine 58 de l'élément de plaquage 36. En fin de course, la tige 76b du pointeau n'obture plus l'orifice 80 du second cylindre 74 et l'air peut s'échapper librement dans la partie supérieure du dispositif ; la partie mobile 18 est alors en position basse, ou position activée, et la chambre de dosage 72 a son volume minimum.During the first use of the device 10, the user presses on the mobile part 18 of the pump and more particularly on the finger-holders 112 of the dispensing nozzle 14 by exerting a force going from the top to the bottom (schematized by arrow 96). Under the action of this force, the mobile part descends and compresses the air contained in the metering chamber 72. Then, the end 76c of the needle 76 abuts against the solid central portion 58 of the plating element 36 At the end of the stroke, the stem 76b of the needle no longer closes the orifice 80 of the second cylinder 74 and the air can escape freely in the upper part of the device; the moving part 18 is then in the low position, or activated position, and the metering chamber 72 has its minimum volume.

Lorsque l'utilisateur relâche la pression sur l'embout 14, le ressort 90 entraîne la partie mobile vers le haut, dans le sens opposé de celui de la flèche 96 et le ressort 78 rappelle le pointeau 76 en configuration de fermeture de l'orifice 80 ce qui provoque une dépression au sein de la chambre de dosage 72. Cette dépression provoque le décollement du disque central de la membrane 34 du support 32, par déformation élastique de la membrane 34 et plus particulièrement de la paroi ajourée 46 et ou du disque central 42 : la membrane 34 est alors en configuration de passage de produit. Dans cette configuration, la déformation subie par la membrane 34 correspond à une amplification de la déformation assurée en configuration de blocage, de façon à se détacher du support 32 pour laisser passer le produit. Le produit peut donc franchir la valve anti-retour, passer à travers les orifices de la paroi ajourée 46 et entrer dans la chambre de dosage 72. Cependant, la déformation supplémentaire de la membrane 34 est limitée par la partie centrale pleine 58 de la paroi transversale 54 de l'élément de plaquage 36. Ainsi, le déchaussement de la membrane est évité.When the user releases the pressure on the tip 14, the spring 90 drives the movable portion upwards in the opposite direction to that of the arrow 96 and the spring 78 recalls the needle 76 in the orifice closure configuration. 80 which causes a depression in the metering chamber 72. This depression causes the separation of the central disk of the membrane 34 of the support 32, by elastic deformation of the membrane 34 and more particularly of the perforated wall 46 and or disk central 42: the membrane 34 is then in product passage configuration. In this configuration, the deformation experienced by the membrane 34 corresponds to an amplification of the deformation provided in blocking configuration, so as to detach from the support 32 to let the product. The product can therefore cross the non-return valve, pass through the orifices of the perforated wall 46 and enter the metering chamber 72. However, the additional deformation of the membrane 34 is limited by the solid central portion 58 of the wall transverse 54 of the plating element 36. Thus, the removal of the membrane is avoided.

En fin de course, la partie mobile 18 est à nouveau en position haute, la chambre de dosage 72 est remplie de produit et la membrane 34 est à nouveau plaquée contre le support 32 en configuration de blocage de produit. Le produit contenu ne peut s'échapper de la chambre de dosage, ni l'air y pénétrer car l'étanchéité est assurée par les premiers 56 moyens d'étanchéité, entre le premier cylindre 70 de la partie mobile, et par les seconds moyens d'étanchéité 66, entre le support 32 et l'élément de plaquage 36. La membrane 34 formant valve anti-retour et le pointeau 76 sont en configuration de blocage de produit.At the end of the stroke, the movable portion 18 is again in the up position, the metering chamber 72 is filled with product and the membrane 34 is again pressed against the support 32 in the product blocking configuration. The product contained can not escape from the metering chamber, nor the air enter because the seal is provided by the first 56 sealing means, between the first cylinder 70 of the movable part, and by the second means sealing member 66 between the support 32 and the plating element 36. The membrane 34 forming a non-return valve and the needle 76 are in the product blocking configuration.

La répétition de ces opérations amorce la pompe et la rend prête à l'emploi.Repetition of these operations will prime the pump and make it ready for use.

Lorsque l'utilisateur souhaite délivrer une dose de produit, comme précédemment, il actionne le dispositif en exerçant une force de haut en bas sur les appui-doigts 112 (dans le sens de la flèche 96), sous l'action de cette force, la partie mobile 18 et donc les premier 70 et second 74 cylindres commencent à descendre, le volume de la chambre de dosage 72 diminue et met le produit qu'elle contient sous pression. Ce produit ne peut s'échapper vers le réservoir ou hors de la pompe grâce aux premiers 56 et seconds 64 moyens d'étanchéité et à la membrane 34 formant valve anti-retour. Il exerce donc une pression vers le haut sur le pointeau 76, de façon que la tige 76b soit déplacée et n'obture plus l'orifice 80. Le produit peut ainsi s'échapper de la chambre 72. Une fois le produit passé à travers l'orifice 80, il s'écoule entre le second cylindre 74 et la jupe interne 86 via un canal 114 aménagé dans la paroi du second cylindre. Il passe ensuite dans la chambre de distribution 84 vers l'embout de distribution 14. Grâce à des canaux aménagés dans l'élément 110, le liquide s'écoule entre la chambre tourbillonnaire 106 et le conduit 100 puis entre la chambre tourbillonnaire et le pointeau 106. Le produit exerce une pression vers le bas sur le pointeau 106 qui, en se déplaçant dans le sens de la flèche 96, permet au produit d'être pulvérisé par l'orifice de pulvérisation 102.When the user wishes to deliver a dose of product, as before, he actuates the device by exerting a force from above downwards on the finger rest 112 (in the direction of the arrow 96), under the action of this force, the moving part 18 and therefore the first 70 and second 74 cylinders begin to descend, the volume of the metering chamber 72 decreases and puts the product it contains under pressure. This product can not escape to the reservoir or out of the pump thanks to the first 56 and second 64 sealing means and the membrane 34 forming a non-return valve. It therefore exerts an upward pressure on the needle 76, so that the rod 76b is displaced and no longer occludes the orifice 80. The product can thus escape from the chamber 72. Once the product has passed through the orifice 80, it flows between the second cylinder 74 and the inner skirt 86 via a channel 114 arranged in the wall of the second cylinder. It then passes into the dispensing chamber 84 to the dispensing nozzle 14. Through channels arranged in the element 110, the liquid flows between the vortex chamber 106 and the duct 100 and between the vortex chamber and the needle 106. The product exerts a downward pressure on the needle 106 which, moving in the direction of the arrow 96, allows the product to be sprayed through the spray orifice 102.

Une fois que la partie mobile 18 a atteint sa position basse, c'est-à-dire une fois que la dose de produit a été distribuée, l'utilisateur relâche sont appui sur la partie mobile 18 et la chambre de dosage 72 se remplit à nouveau de produit comme cela a été décrit précédemment.Once the moving part 18 has reached its low position, that is to say once the dose of product has been dispensed, the user releases is resting on the moving part 18 and the metering chamber 72 fills up. again product as previously described.

On constate, par ailleurs, que le produit à distribuer n'est jamais en contact avec les trois ressorts 78, 90 et 108.It is noted, moreover, that the product to be dispensed is never in contact with the three springs 78, 90 and 108.

Parmi les avantages de ce dispositif, on peut constater que la jupe 52 est en matériau moins perméable à l'air que la matériau de la membrane, et qu'en conséquence, la diffusion d'air à travers sa paroi est particulièrement faible, d'où une meilleur précision dans les doses délivrées.Among the advantages of this device, it can be seen that the skirt 52 is made of a material that is less permeable to air than the material of the membrane, and that as a result, the diffusion of air through its wall is particularly weak. where better accuracy in the delivered doses.

On notera que l'invention n'est pas limitée aux modes de réalisation précédemment décrits.Note that the invention is not limited to the previously described embodiments.

Claims (10)

  1. Pump (12) for delivering a product, comprising a piston (28) slidably mounted in a metering chamber (72), the piston (28) comprising
    - a support (32),
    - a membrane (34) forming a non-return valve, allowing the product to pass into the metering chamber (72), made of a first material, characterised in that said piston comprises:
    a pressing element (36) for pressing the membrane (34) against the support (32), comprising a skirt (52) carrying sealing means (56) guaranteeing that the piston (28) slides in a sealing manner in the metering chamber (72), the pressing element (36) being made of a second material, different from the first material of the membrane, being attached to the membrane (34), and comprising a pressing surface (50) for pressing the membrane, which keeps the deformed membrane (34) pressed against the support (32) so as to guarantee closing of the non-return valve.
  2. Pump (12) according to the preceding claim, wherein the membrane (34) is made of silicone, propylene/ethylene copolymers, polyether blockamides, polyvinyl, terpolymer of ethylene, propylene and a diene (EPDM), polymer of sequenced styrene-butadiene (SBS), polymer of sequenced styrene-ethylene-butadiene (SEBS-SIS), polyurethane, rubbers of butyl or nitrile, latex, fluorinated elastomers, or mixture of polypropylene with one of the following elastomers: polymers of sequenced styrene-ethylene-butadiene (SEBS-SIS), terpolymers of ethylene, propylene and a diene (EPDM), polymers of sequenced styrene-butadiene (SBS).
  3. Pump (12) according to any one of the preceding claims, wherein the pressing element (36) is made of high or low density polyethylene, polypropylene, polyester, polyacetal, ethylene-vinyl acetate, or mixtures thereof.
  4. Pump (12) according to any one of the preceding claims, wherein the skirt (52) comprises an upper end and a lower end, and the sliding sealing means (56) are carried by the upper end of the skirt, and comprise for example a lip of revolution.
  5. Pump (12) according to any one of the preceding claims, wherein the membrane (34) comprises a central disc (42) carrying means forming non-return valve by cooperating with the support (32), and a positioning edge (44) connected to the disc (42) by a perforated wall (46) that allows the product to pass through.
  6. Pump (12) according to any one of the preceding claims, wherein the support (32) comprises a substantially cylindrical outer surface carrying second sealing means (66), allowing the skirt (52) to be fixed in a sealing manner on the support (32).
  7. Pump (12) according to any one of the preceding claims, wherein the support (32) comprises a shoulder (68) against which the lower end of the skirt (52) abuts.
  8. Pump (12) according to any one of the preceding claims, wherein the pressing element (36) comprises fixing means (62) on the support (32) by ratcheting, comprising a groove (62) cooperating with a lug or an annular rib (64) made on the support (32).
  9. Pump (12) according to any one of the preceding claims, wherein the pressing element (36) comprises a transverse wall (54) made in one piece with the skirt (52), comprising a solid central part (58).
  10. Pump (12) according to any one of the preceding claims, configured for delivering the product without air intake.
EP11735473.8A 2010-06-10 2011-06-09 Pump for delivering a product, comprising a piston sliding in the metering chamber Not-in-force EP2579993B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1054607A FR2961191B1 (en) 2010-06-10 2010-06-10 PUMP FOR DELIVERING A PRODUCT HAVING A SLIDING PISTON IN A DOSING CHAMBER
PCT/FR2011/051319 WO2011154664A1 (en) 2010-06-10 2011-06-09 Pump for delivering a product, comprising a piston sliding in the metering chamber

Publications (2)

Publication Number Publication Date
EP2579993A1 EP2579993A1 (en) 2013-04-17
EP2579993B1 true EP2579993B1 (en) 2019-01-02

Family

ID=43533134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11735473.8A Not-in-force EP2579993B1 (en) 2010-06-10 2011-06-09 Pump for delivering a product, comprising a piston sliding in the metering chamber

Country Status (5)

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US (1) US9151281B2 (en)
EP (1) EP2579993B1 (en)
CN (1) CN103037979B (en)
FR (1) FR2961191B1 (en)
WO (1) WO2011154664A1 (en)

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FR3041548B1 (en) * 2015-09-24 2017-11-03 Nemera La Verpilliere DEVICE FOR DELIVERING A PRODUCT BY SPRAYING WITH AN IMPROVED END.
CN105642470A (en) * 2015-12-25 2016-06-08 中山市美捷时包装制品有限公司 Gun pump capable of being used at multiple angles
EP3487353A4 (en) * 2016-07-22 2020-04-08 HCT Group Holdings Limited Pull down pump actuator
FR3063661B1 (en) * 2017-03-07 2021-05-21 Promens Sa DEVICE FOR DISTRIBUTION OF A PRODUCT WITH IMPROVED PRIMING
CN107583776B (en) * 2017-10-25 2018-07-27 绍兴市华创聚氨酯有限公司 A kind of spray gun for spraying polyurethane
US10617832B2 (en) * 2017-11-22 2020-04-14 Southwest Research Institute High precision, low dose atomizer
WO2019182745A1 (en) 2018-03-19 2019-09-26 Bryn Pharma, LLC Epinephrine spray formulations
DK3681818T3 (en) * 2018-09-07 2024-03-25 Wacker Chemie Ag PROCEDURE FOR PACKAGING SILICONE MASSES
USD1021066S1 (en) 2022-03-03 2024-04-02 Consort Medical Limited Inhaler
USD1021067S1 (en) 2022-04-08 2024-04-02 Consort Medical Limited Inhaler

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Also Published As

Publication number Publication date
CN103037979B (en) 2016-10-19
US20130164156A1 (en) 2013-06-27
WO2011154664A1 (en) 2011-12-15
FR2961191A1 (en) 2011-12-16
EP2579993A1 (en) 2013-04-17
CN103037979A (en) 2013-04-10
US9151281B2 (en) 2015-10-06
FR2961191B1 (en) 2012-07-27

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