EP0722368B1 - Pompe de dosage - Google Patents

Pompe de dosage Download PDF

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Publication number
EP0722368B1
EP0722368B1 EP94928817A EP94928817A EP0722368B1 EP 0722368 B1 EP0722368 B1 EP 0722368B1 EP 94928817 A EP94928817 A EP 94928817A EP 94928817 A EP94928817 A EP 94928817A EP 0722368 B1 EP0722368 B1 EP 0722368B1
Authority
EP
European Patent Office
Prior art keywords
piston
pump
liquid
valve
sealing element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94928817A
Other languages
German (de)
English (en)
Other versions
EP0722368A1 (fr
Inventor
Detlef Schmitz
Bernhard Jasper
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.)
Aptar Dortmund GmbH
Original Assignee
Seaquist Perfect Dispensing GmbH
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 Seaquist Perfect Dispensing GmbH filed Critical Seaquist Perfect Dispensing GmbH
Publication of EP0722368A1 publication Critical patent/EP0722368A1/fr
Application granted granted Critical
Publication of EP0722368B1 publication Critical patent/EP0722368B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B05B11/1016—Piston pumps the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1066—Pump inlet valves
    • B05B11/1067—Pump inlet valves actuated by pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/0005—Components or details
    • B05B11/0037—Containers
    • B05B11/0039—Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means
    • B05B11/0044—Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure by ingress of atmospheric air into the container, i.e. with venting means

Definitions

  • the invention relates to a metering pump for atomizing a liquid, the pump housing, which can be placed on a container for the liquid; a hollow pump piston biased in the closing direction with a first piston piece and a second piston piece adjoining it in the axial direction, the pump piston being axially displaceable in the interior of a cylinder in the pump housing; a valve cone spring-loaded in the closing direction, which is axially displaceable inside the pump piston and forms an outlet valve with a valve opening in the pump piston, a sealing element being provided for sealing between the valve cone and an inner wall of the pump piston; and has a check valve between the container and the interior of the pump housing.
  • a pump is known from EP-A-0 364 385.
  • Metering pumps of this type are used to easily spray liquids. They have the favorable property of atomizing a precisely defined dose of the liquid with each actuation. In addition, the liquid is transported and atomized solely by manual operation with the aid of pressure pistons, without the need for a compressed gas or the like. These dosing pumps are therefore advantageous from the point of view of environmental protection and safety; they are also easy to manufacture, since pressure vessels and the like can be dispensed with.
  • Such a metering pump is known, for example, from FR-A 2 133 259.
  • the construction of this pump is also described in detail in EP-A-0 342 651.
  • manual pressure on the hollow pump piston releases the liquid in a pump chamber through the inside of the pump piston and out through a spray opening. If no external pressure is exerted on the pump piston, it moves back to its starting position due to the action of a return spring.
  • a negative pressure is created in the pump chamber, so that the pump chamber is refilled with the liquid.
  • valve cone which is movably arranged within the pump piston and which, when there is sufficient pressure in the pump chamber, makes the connection to the spray opening, is sealed against the pump piston by means of a sealing lip running around the valve cone.
  • the invention is based on the object of designing the metering pump mentioned at the outset in such a way that there is no longer any leakage between the pump piston and valve cone and the metering pump operates reliably under all circumstances.
  • sealing element is an elastic washer, the outer periphery of which is tightly clamped between the first piston piece and the adjoining second piston piece of the pump piston, so that the interior of the second piston piece receiving the valve cone and its closing spring is always sealed is.
  • a seal is provided between the valve cone and the inner wall of the pump piston, the relative position of which is stationary both at the point of contact between the seal and the pump piston and at the point of contact between the seal and the valve cone, and which deforms elastically when the valve cone moves.
  • the sealing element thus does not move along an adjacent wall, there can also be no friction and therefore no wear of the sealing element with the result of an increasing leak.
  • the sealing element can be dimensioned such that no leaks due to plastic flow of the sealing element can occur.
  • FIG. 1 and 2 each show a longitudinal section through a first embodiment of the metering pump according to the invention.
  • Fig. 1 shows the metering pump in the normal rest position when no pressure is exerted thereon
  • Fig. 2 shows the metering pump when a force F is exerted thereon immediately after a liquid dose has been atomized.
  • the metering pump of FIGS. 1 and 2 has an essentially cylindrical pump housing 10.
  • a bracket 20 which by means of a Radial ring flange 22 can be placed on the opening of a container (not shown) for the liquid to be sprayed in such a way that the ring flange 22 abuts the container opening and can be attached to the container, for example with the aid of a closure cap (also not shown).
  • the holder 20 also has an axially extending inner jacket 24 which projects into the interior of the pump housing 10. The interior of the container is connected to the ambient air via recesses 26 in the holder 20 when the force F is exerted on the metering pump (FIG. 2).
  • connection nipple 30 serves to receive an immersion tube which extends approximately to the bottom of the container and through which the liquid is sucked in. (The dip tube is not shown.)
  • An axially movable pump piston 40 is arranged in the interior of the pump housing 10.
  • the pump piston 40 has an elongated, hollow piston shaft 42 with an axial outlet channel 43, which projects upwards out of the pump housing 10 and onto which an actuating button (not shown) is provided, which is provided with a spray opening (also not shown) which exits the liquid to be sprayed when the metering pump is actuated.
  • a first piston piece 44 adjoins the piston shaft 42 in one piece in the axial direction and lying within the pump housing 10. In the extension of the axial outlet channel 43 of the piston skirt 42, there is a valve opening 45 with a valve seat 46 in the first piston piece 44.
  • the first piston piece 44 has two axially spaced sealing lips 48, 49, which, on the one hand, seal the interior of the pump housing 10 outwards and on the other hand, together with the inner casing 24 of the holder 20, serve to guide the pump piston 40 during its axial movement.
  • a second piston piece 52 is in turn connected to the first piston piece 44.
  • the second piston piece 52 has a closed bottom 54 so that it generally has the shape of a cup which is fastened with its upper, open end 53 to the first piston piece 44, for example by means of an annular bead on the inner wall of the second piston piece 52 and a corresponding one Annular groove in the outer wall of the first piston piece 44, into which the annular bead engages.
  • the pump piston 40 is held in its rest position by a return spring 56 or brought into this rest position by the spring 56 after actuation of the metering pump.
  • the compression spring 56 rests on the one hand on the bottom of the pump housing 10 and on the other hand on a shoulder 58 of the pump piston 40 in such a way that the pump piston 40 is urged upwards by the spring 56 in the direction of its rest position.
  • the path of the pump piston 40 upwards is limited by the inner jacket 24 of the holder 20, which forms an upper stop for the pump piston 40.
  • the inner jacket 24 in connection with the upper sealing lip 48 of the pump piston 40 provides a seal in the rest position of the pump piston 40, so that in this rest position the container is sealed to the outside and no liquid can escape.
  • the pump piston 40 with the second piston piece 52 and the interior of the pump housing 10 form a pump chamber 60.
  • the pump chamber 60 is connected via a check valve 62, for example a ball valve, to the connection nipple 30 for sucking the liquid out of the container.
  • Via channels 64 there is a fluid connection between the pump chamber 60 and the interior of the pump piston 40 in the side wall of the pump piston 40, for example at the connection point between the first and the second piston pieces 44 and 52.
  • Valve cone 70 Inside the pump piston 40, that is to say in a cavity 41 which is enclosed by the first and second piston pieces 44 and 52, there is an axially movable independently of the pump piston 40 Valve cone 70, the upper end of which rests on the valve seat 46 of the first piston piece 44 and thus closes the valve opening 45 and thus the outlet channel 43 leading to the spray opening in the piston shaft 42, as long as the metering pump is not actuated.
  • the valve cone 70 is under the action of a second compression spring 72.
  • the spring 72 rests on the one hand in the second piston piece 52 against the bottom 54 thereof and on the other hand is supported on guide ribs 74 of the valve cone 70, which guide the valve cone 70 along the inner walls of the second Guide piston piece 52.
  • the pump chamber 60 is sealed off from the interior of the second piston piece 52 by an elastic sealing element 80.
  • the pump chamber 60 is connected to the valve seat 46 via the radial channels 64.
  • the elastic sealing element 80 is designed as an annular disk which is tightly clamped on its outer circumference between the first and second piston pieces 44, 52 and whose inner circumference is radially preloaded in an arcuate cross section Is annular groove 82 which is formed in the valve cone 70. Since the shoulder 58, on which the pump piston return spring 56 is supported, is designed as a section 61 of the second piston piece 52 with an enlarged diameter, the outer shoulder 58 corresponds to an inner, annular shoulder-shaped shoulder 59, on which the sealing element 80 lies tightly.
  • the widened section 61 of the second piston piece 52 engages over a tubular extension 47 with outer clamping ribs 55 of the first piston piece 44 provided at angular intervals and is fastened thereto by means of an annular latching connection 81.
  • the angular distances between the clamping ribs 55 for the sealing element 80 form the radial passage channels 64.
  • the projection 47 of the first piston piece 44 projects so far into the section 61 of the second piston piece 52 that the outer circumference of the sealing element 80 between the first and the second piston piece 44, 52 is clamped gas and liquid-tight.
  • the inner edge of the hole of the sealing element 80 is also gas and liquid-tight in the annular groove 82 of the valve cone 70, so that there is a liquid-tight connection of the sealing element 80 both with the inner wall of the second piston piece 52 of the pump piston 40 and with the valve cone 70.
  • the sealing element 80 deforms elastically without a displacement movement taking place between the sealing element 80 and the adjacent parts.
  • the elastic deformation of the sealing element 80 supports the action of the compression spring 72.
  • the ring disk for the sealing element 80 lies with its inner edge of the hole preferably with radial prestress in the ring groove 82 and consists of a plastic material or a rubber material which is suitable in terms of elasticity and compatibility with the liquid to be conveyed.
  • the mode of operation of the metering pump is briefly described below.
  • the pump chamber 60 is filled without external force and the valve opening 45 and the cutouts 26 are closed by the valve cone 70 and the pump piston 40, respectively, so that the container and the pump chamber 60 are closed off from the outside.
  • the force F is exerted on the actuation button and thus on the piston shaft 42 of the pump piston 40, several successive processes take place until the position of the individual parts of the metering pump shown in FIG. 2 is reached. If the pressure force F exceeds the resistance of the return spring 56 at the beginning of the force action, the pump piston 40 moves down as a whole.
  • the pump piston 40 is moved upward again into its rest position by the return spring 56. Since the valve cone 70 has already moved upward again within the pump piston 40, the valve opening 45 on the valve seat 46 is also closed again. This creates a negative pressure in the pump chamber 60, through which liquid is sucked from the container into the pump chamber 60 via the check valve 62. The next time the metering pump is actuated, this liquid is then conveyed outside again.
  • the sealing element 80 according to the invention brings about a secure seal which is not influenced by wear or aging (creep), so that no liquid can get into the lower region of the interior of the pump piston 40, which could hinder the movement of the valve cone 70 over time.
  • the metering pump according to the invention has relatively few Individual parts and is therefore easy to manufacture and easy to assemble.
  • FIGS. 3 and 4 show a second embodiment of the metering pump according to the invention.
  • the sealing element 80 is not provided as a separate washer, but is formed in one piece with the valve cone.
  • the sealing element 80 is formed here as a circumferential ring flange 90 on the valve cone 70.
  • the outer circumference of the ring flange 90 as in the first embodiment, is clamped or clamped in a liquid-tight manner between the tubular extension 47 with the outer clamping ribs 55 of the first piston piece 44 and the shoulder 59 corresponding to the shoulder 58 of the second piston piece 52 and deforms during movement of the valve cone 70 is elastic in order to provide a reliable seal on the wall of the pump piston 40.
  • this embodiment corresponds to the example shown in FIGS. 1 and 2.
  • FIG. 3 shows the metering pump in the normal or idle state
  • FIG. 4 shows the metering pump when actuated, the processes described above in connection with FIGS. 1 and 2 taking place.
  • the special check valve consists of a perforated disk 92 inserted into the transition between the connecting nipple 30 and the pump housing 10, onto which a valve element 96 is placed by means of elastic ribs 94 such that it closes the valve opening 98 in the connecting nipple 30 when the pump is actuated. If a vacuum occurs in the pump chamber 60 during the upward movement of the pump piston 40 in the pump housing 10, the valve element 96 lifts up against the elastic action of the ribs 94 from the valve opening 98 in the connection nipple 30 and clears the way for the liquid.

Landscapes

  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Reciprocating Pumps (AREA)

Claims (4)

  1. Pompe doseuse pour la pulvérisation d'un liquide, comprenant :
    - un corps de pompe (10), qui peut être monté sur un réservoir pour le liquide ;
    - un piston de pompe creux (40) précontraint dans le sens de la fermeture et comportant une première pièce de piston (44) et une seconde pièce de piston (52) qui s'y raccorde dans la direction axiale, le piston de pompe (40) étant axialement coulissant à l'intérieur d'un cylindre dans le corps de pompe (10) ;
    - un cône de clapet (70) sollicité élastiquement dans le sens de la fermeture, qui est axialement coulissant à l'intérieur du piston de pompe (40) et qui forme avec une ouverture de clapet (45) dans le piston de pompe (40) un clapet de sortie, un élément d'étanchéité (80 ; 90) étant prévu pour l'étanchéité entre le cône de clapet (70) et une paroi interne du piston de pompe (40) ; et
    - un clapet anti-retour (62) entre le réservoir et l'intérieur du corps de pompe (10) ;
    caractérisée en ce que l'élément d'étanchéité (80 ; 90) est une rondelle annulaire élastique, dont la périphérie extérieure est coincée de manière étanche entre la première pièce de piston (44) et la deuxième pièce de piston (52) du piston de pompe (40) qui s'y raccorde, de telle sorte que l'espace intérieur de la seconde pièce de piston (52) recevant le cône de clapet (70) et son ressort de fermeture (72) est toujours étanchéifié.
  2. Pompe doseuse selon la revendication 1, caractérisée en ce que la périphérie interne d'un bord de trou du disque annulaire élastique (80) vient en prise dans une rainure annulaire (82) du cône de clapet (70) avec une précontrainte radiale.
  3. Pompe doseuse selon la revendication 1, caractérisée en ce que l'élément d'étanchéité est une bride annulaire (90) qui est formée d'une seule pièce sur le cône de clapet (70).
  4. Pompe doseuse selon l'une des revendications 1 à 3, caractérisée en ce que le clapet anti-retour (62) comporte un disque percé (92) sur lequel un élément de clapet axialement déplaçable (96) est monté au moyen de pattes élastiques (94).
EP94928817A 1993-09-27 1994-09-26 Pompe de dosage Expired - Lifetime EP0722368B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4332869A DE4332869C2 (de) 1993-09-27 1993-09-27 Dosierpumpe
DE4332869 1993-09-27
PCT/EP1994/003205 WO1995009054A1 (fr) 1993-09-27 1994-09-26 Pompe de dosage

Publications (2)

Publication Number Publication Date
EP0722368A1 EP0722368A1 (fr) 1996-07-24
EP0722368B1 true EP0722368B1 (fr) 1997-04-23

Family

ID=6498753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94928817A Expired - Lifetime EP0722368B1 (fr) 1993-09-27 1994-09-26 Pompe de dosage

Country Status (4)

Country Link
EP (1) EP0722368B1 (fr)
AT (1) ATE152010T1 (fr)
DE (1) DE4332869C2 (fr)
WO (1) WO1995009054A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19756442A1 (de) 1997-12-18 1999-06-24 Pfeiffer Erich Gmbh & Co Kg Spender für Medien
DE19807922A1 (de) 1998-02-25 1999-08-26 Pfeiffer Erich Gmbh & Co Kg Spender für Medien
IT1307537B1 (it) * 1999-12-24 2001-11-06 Taplast Spa Vaporizzatore per liquidi
DE102005056488A1 (de) 2005-11-21 2007-05-24 Ing. Erich Pfeiffer Gmbh Spender und Dosierbaugruppe für die Mediumdosierung
EP2167394B1 (fr) 2007-07-16 2012-04-04 Summit Packaging Systems, Inc. Appareil pourvu d'une douille et d'une valve pour dispositif poche a valve
JP4775975B2 (ja) * 2007-12-14 2011-09-21 キャニヨン株式会社 蓄圧式ディスペンサー

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1783646A (en) * 1926-04-13 1930-12-02 Firm Of Alex Friedmann Stop valve
US1964921A (en) * 1930-06-19 1934-07-03 Lundberg Olof Water-supply cock
FR2133259A5 (fr) * 1971-04-08 1972-11-24 Step
ES288332Y (es) * 1985-07-24 1986-08-01 Monturas Y Fornituras,S.A. Bomba surtidora de fluido contenido en un recipiente.
FR2631564B1 (fr) * 1988-05-18 1990-08-17 Step Soc Tech Pulverisation Pompe-doseuse perfectionnee pour pulverisateurs
ES2011140A6 (es) * 1988-10-10 1989-12-16 Monturas Sa Bomba pulverizadora.
ES2024213A6 (es) * 1990-04-26 1992-02-16 Monturas Sa Perfeccionamientos en el objeto de la patente de invencion 88 03075 por bomba pulverizadora.

Also Published As

Publication number Publication date
DE4332869A1 (de) 1995-04-06
EP0722368A1 (fr) 1996-07-24
WO1995009054A1 (fr) 1995-04-06
ATE152010T1 (de) 1997-05-15
DE4332869C2 (de) 1995-10-19

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