EP0484835B1 - Dispensing device for fluids - Google Patents

Dispensing device for fluids Download PDF

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Publication number
EP0484835B1
EP0484835B1 EP91118678A EP91118678A EP0484835B1 EP 0484835 B1 EP0484835 B1 EP 0484835B1 EP 91118678 A EP91118678 A EP 91118678A EP 91118678 A EP91118678 A EP 91118678A EP 0484835 B1 EP0484835 B1 EP 0484835B1
Authority
EP
European Patent Office
Prior art keywords
pump
chamber
valve
piston
discharge
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
EP91118678A
Other languages
German (de)
French (fr)
Other versions
EP0484835A1 (en
Inventor
Stefan Ritsche
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 Radolfzell GmbH
Original Assignee
Erich Pfeiffer GmbH
Ing Erich Pfeiffer 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 Erich Pfeiffer GmbH, Ing Erich Pfeiffer GmbH filed Critical Erich Pfeiffer GmbH
Publication of EP0484835A1 publication Critical patent/EP0484835A1/en
Application granted granted Critical
Publication of EP0484835B1 publication Critical patent/EP0484835B1/en
Anticipated expiration legal-status Critical
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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
    • B05B11/1042—Components or details
    • B05B11/1066—Pump inlet valves
    • B05B11/107—Gate valves; Sliding valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B05B11/1004—Piston pumps comprising a movable cylinder and a stationary piston
    • 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
    • B05B11/1073—Springs
    • B05B11/1074—Springs located outside pump chambers

Definitions

  • the invention relates to a discharge device according to the preamble of claim 1. It is intended for media and has a housing and an actuation for carrying out a single or more discharge processes.
  • the discharge device is independent of whether it is designed as a manually opening outlet valve for pressure accumulators or as a discharge pump to be operated manually via a pump stroke, provided with one or more separate media guides, which as a rule lead from a media store to an outlet opening leading to the outside are. If the discharge device is formed essentially only by at least one outlet valve, the media guide can include the media store, the valve closing surfaces, possibly an inlet channel leading to these and an outlet channel leading from these to the outlet opening, and the outlet opening itself.
  • the media guide includes the pump chamber, which may be provided solely as a media store, and usually also at least one valve, at least one inlet valve, at least one intermediate valve and / or at least one outlet valve being able to be provided.
  • the discharge device can be used for one-handed use Use and be trained for manual operation only.
  • Valves, resets and similar functional units of discharge devices mostly contain metallic parts, e.g. Valve bodies, return springs or the like., The metallic surface of which can lead to undesirable reactions in numerous media, in particular pharmaceutical and / or cosmetic media, when they come into contact with these surfaces. Media can also damage such parts if chemical reactions occur. This applies in particular to liquid or paste-like media, but such disadvantages can also arise with other flowable media.
  • a discharge device with a media inlet which opens through the jacket of a pumping chamber into this pumping chamber.
  • the inlet lies at a distance from the bottom wall of the pumping chamber and is connected to a media channel which is delimited between two nested bodies.
  • the invention has for its object to provide a discharge device of the type mentioned, in which disadvantages of known designs or the type described are avoided and which is particularly suitable for storing and discharging relatively reactive or aggressive media.
  • the discharge device is designed according to claim 1.
  • at least one of possibly several media guides is essentially completely free of metallic surfaces and preferably excludes them Limited surfaces that consist of plastic, glass, ceramic materials and / or the like .
  • the discharge device still expediently contains metallic components where the function can be improved by such components. This applies in particular to the use of at least one, preferably a single return spring, because such return springs made of metal usually have much better properties than return springs made of other materials.
  • the respective metallic component is advantageously arranged completely outside of the media guide in a receiving chamber sealed with respect to it, so that the component as a whole cannot come into contact with the medium.
  • this receiving chamber can be resized so that the spring can take effect via the spring stroke.
  • the spring chamber can be delimited by a cylinder and an auxiliary piston which can be displaced therein, the auxiliary piston transmitting the spring forces.
  • only a single return spring is provided, while all other components of the discharge device or at least those that come into contact with the medium consist of plastic or one of the non-metallic materials mentioned.
  • the object on which the invention is based can also be achieved independently of the design described, in particular in the case of a discharge device with a pump, in that an inner jacket of the housing lying approximately in the pump axis is sealed with respect to the media guide is closed and thus communicates neither with the suction or inlet channel nor with the outlet channel or the pump chamber.
  • the media inlet in the housing is laterally offset from the inner casing in such a way that the enclosed space is bypassed by the inflowing medium. This enables a particularly effective and rapid filling of the housing to be achieved even if the inlet opening opening into the housing is designed to be valve-free.
  • the inlet opening expediently opens into a chamber which surrounds the inner jacket in a ring, which can be designed as a pre-suction chamber and is connected to a pump chamber via an intermediate valve. If this intermediate valve is controlled as a function of the respective position of the discharge actuation, it can be closed very precisely at the beginning of the delivery stroke.
  • the return spring can simultaneously serve to reset the discharge actuation or an actuation handle of the mutually movable pump units consisting of pump pistons and pump cylinders or the like, as well as to return at least one valve to an initial position.
  • the return spring expediently opens the intermediate valve during the return, while it closes the outlet valve at the beginning of the return stroke and returns the discharge actuation to the starting position via the valve closing surfaces.
  • the auxiliary piston carries a valve body formed in one piece with it, which can be controlled in a pressure-dependent manner in that the auxiliary piston is exposed to the pressure in the pump chamber on its side facing away from the closed chamber.
  • the inner jacket can simultaneously form the valve piston surrounding this valve body, which is overlapped by the pump cylinder to be moved with the discharge actuation, which in turn carries a suction piston on the outer circumference and is penetrated by an outlet channel in an end wall having the valve seat of the outlet valve, which is expediently essentially in an actuating plunger extending from this end wall.
  • the closed chamber can extend outwards beyond a bottom wall or a support flange of the housing and thereby overlap with the projecting part the associated end of the inlet channel or a riser or suction pipe and its plug connection, so that there is a very small axial extent of the pump results. It is also conceivable to provide several chambers, pump chambers or the like which are sealed off from the media guide.
  • a ventilation channel expediently bypasses all areas that come into contact with the medium, such as the media reservoir, the pump chamber, the pre-suction chamber or the like, in which the ventilation channel acts as a transverse channel from the closed chamber directly to the outside of the housing and outside.
  • the ventilation duct can connect approximately to the level of the inside of the housing base. If such pressure relief is not provided, the auxiliary piston can work together with the closed chamber in the manner of a gas pressure spring.
  • Ventilation for the media reservoir and / or the housing space located behind the suction piston and not acted upon by the medium can be formed by an aeration channel be located on part of its length between overlapping housing parts of the housing and on a further part of its length between one of these housing parts and the pump part to be moved with the discharge actuation, these two sections connecting to the annular space behind the suction piston.
  • the discharge device 1 has a housing 2 consisting of only two housing parts spanning the greater part of its length, which is to be fastened to the neck 4 of a media store 3 and at the end remote from it a discharge actuation 5 with a manually linear finger pressure moving discharge head 6 carries.
  • a thrust piston pump 7 is arranged in the housing 2, the pump parts of which are connected to the discharge head 6 a pump stroke is to be moved against each other.
  • the housing 2 has a hollow base body 9 with a support flange 10 projecting annularly over the outer circumference, which is clamped against the neck 4 with a cap 8 essentially surrounding the housing 2.
  • the base body 9 is closely enclosed on its outer circumference by a cup-shaped cover body 11 approximately over its entire length adjoining the support flange.
  • the support flange 10 forms an annular groove 12 into which the free end of the casing of the cover body 11 engages and is secured, for example, with a snap connection.
  • the base body 9 forms an outer casing 13 which delimits the annular groove 12 on the inner circumference and is closely enclosed by the cover body 11, as well as a slightly longer inner casing 14 lying radially within it, between which an annular space is delimited to form a pre-suction chamber 15.
  • the pre-suction piston 17 runs close to the inner circumference of the outer casing 13. With its inner circumference, the cylinder casing 16 forms a cylinder raceway for a pump piston 18, which is formed by a sealing lip at the free end of the inner casing 15.
  • the cylinder jacket 16 or the pre-suction piston 17 is connected via an actuating plunger 19 to the discharge head 6 by a plug connection.
  • a reset 20 is provided, which is essentially within the outer jacket 13 and the inner jacket 14 has return spring 21 lying. This lies in a sealed spring chamber 22, which is delimited at its end remote from the media store 3 by an auxiliary piston 23, which is guided with two axially adjacent sealing lips on the inner circumference of the inner jacket 14.
  • the housing 2 has a bottom wall 24 which lies approximately in the plane of the support flange 10, closes the ring or pre-suction chamber 15 at one end and from the inside of which the outer jacket 13 and the inner jacket 14 project freely in one piece.
  • the bottom wall 24 is provided with a cup-shaped projection 25 protruding from its outside, through which the spring chamber 22 is correspondingly extended and in which the associated end of the return spring 21 is supported, as well as in the center of the cup-shaped auxiliary piston 23.
  • the free end of the inner jacket 14 or the pump piston 18 is opposite an outlet valve 26, the valve seat of which is provided approximately in the pump axis on the inside of an end wall 27 of the cylinder jacket 16, which, like the actuating plunger 19 adjoining it, is penetrated by an outlet channel 28.
  • the outlet channel 28 leads to the outlet opening 29 provided on the actuating and discharge head 6, which can be formed by a nozzle.
  • the return spring 21 loads the outlet valve 26 to the closed position.
  • the cylinder jacket 16, the pump piston 18, the auxiliary piston 23 and the end wall 27 delimit the pump chamber 39, which is ring-shaped in cross section and is connected to the pre-suction chamber 15 via an intermediate valve 30 which operates in a stroke-dependent manner.
  • Whose valve parts are integrally formed with the pump piston 18 or the cylinder jacket 16 and the pre-suction piston 17 and work as a slide valve.
  • longitudinal slots are provided which connect the pre-suction chamber 15 to the pump chamber 39 until the pump piston 18 has carried out the first half of its pumping stroke or the last half of its return stroke; valve 30 is closed on the remaining partial stroke.
  • the bottom wall of the pre-suction chamber 15 is penetrated by an inlet opening 31, which thus is at a distance from the front end of the pre-suction piston 17 essentially in any position and is not offset inwards relative to the bottom wall 24.
  • the inlet opening 31 is connected to the bottom region of the media store 3 via an inlet channel 32.
  • a riser pipe 33 which essentially forms the inlet channel 32, is inserted into a plug connection 34 of the base body 9 lying outside the pump axis and approximately parallel to it, and can extend approximately into the region of the bottom wall 24.
  • a sleeve extension 35 of the base body 9 which has a smaller width than the outer jacket 13 and a larger width than the inner jacket 14 and which is relatively closely matched to the inside width of the neck 4, so that it lies only with a small gap distance from its inner circumference.
  • the sleeve extension 35 protrudes beyond the projection 25 located in it, which forms with a jacket region a subsequent jacket region of the sleeve-shaped plug connection 34, the jacket region thereof facing away from which is formed by a jacket section of the sleeve extension 35, so that the plug connection 34 is directly on the inside of the sleeve extension 35 lies.
  • the riser pipe 33 can thereby extend over a longitudinal section extend the discharge device, over which the return spring 21 also extends.
  • annular displacement projection 36 which is conical on the outer circumference at an acute angle and essentially cylindrical on the inner circumference, the outer circumference of which is at a distance from the cylinder raceway and is associated with a complementarily adapted, funnel-shaped opening 37 on the pump piston 18. which is formed by the inner circumference of the piston lip.
  • the inner circumference of the displacement projection 36 is relatively closely matched to the outer circumference of the hollow jacket-shaped and at the end conically closed valve body 38 of the outlet valve 26, which engages in the recess delimited by the displacement projection 36 in the end wall 27 and delimits an annular gap with the inner circumference of the displacement body 36 and opens and closes with its conical end the valve seat lying on the recess bottom.
  • the valve body 38 projects in one piece towards the rear over the auxiliary piston 23, projects beyond the free end of the pump piston 18 and has a smaller width than the auxiliary piston 23, so that it protrudes without contact.
  • the discharge device 1 works according to the following method: In the initial position, the pre-suction piston 17 and the auxiliary piston 23, which have approximately the same axial extent, lie essentially in the same longitudinal section of the discharge device, while the pump piston 18 lies closer to the discharge head 6 at an axial distance therefrom.
  • the pump chamber 39 which is assumed to be filled with medium, is narrowed, so that when the outlet valve 26 is closed, medium is first drawn out of the pump chamber 39 via the Valve 30 is pressed back into the pre-suction chamber 15 and into the media storage 3.
  • the auxiliary piston 23 including the valve body 38 is moved against the bottom wall 24, so that the valve body 38 lifts off the valve seat and the outlet valve 26 opens.
  • the displacement projection 36 penetrates completely into the opening 37, so that the medium is pressed out into the outlet channel 28.
  • the end of the pump piston 18 strikes the inside of the end wall 27 and / or the end of the pre-suction piston 17 hits the inside of the bottom wall 24, the pressure in the pump chamber 39 dropping due to the medium flowing out.
  • the auxiliary piston 23 is moved back into its closed position under the force of the return spring 21, as a result of which the pump chamber is narrowed again and medium is pressed under pressure into the outlet channel 28 during the closing of the valve 26, so that there is another pump surge at the end of the discharge. through which dripping of the medium from the outlet opening 29 can be avoided.
  • valve body 38 is now in contact with the movable pump part. If this pump part is released by releasing the discharge head 6, then it is moved back into its starting position by the return spring 21 via the valve surfaces of the outlet valve 26 lying against one another. During this return stroke, namely until the valve 30 opens, a negative pressure is built up in the pump chamber 39 and then suddenly the connection between the pump chamber 39 and the pre-suction chamber 15 is established by opening the valve 30. At the same time, the pre-suction chamber 15 is expanded during the return stroke and, as a result, medium is sucked into the pre-suction chamber 15 via the inlet channel 32 from the media store 3.
  • the inlet opening 31 or the inlet channel 32 does not require any special inlet valve, so that the line connection between the media store 3 and the pre-suction chamber 15 is always open.
  • the pump chamber 39 is filled from the outside radially inwards or from a larger-volume pre-suction chamber 15 to a smaller-volume pump chamber 39, since the pre-suction chamber 15 at least partially surrounds the pump chamber 39 in an axial view. Since the displacement projection 36 in the pump stroke end position essentially completely fills the opening 37, the remaining amount of medium remaining in the pump chamber 39 is very small. Due to the valve body 38 slidably mounted on the pump piston 18, the bottom wall of the pump chamber 39 formed by the end wall 27 and opposite the pump piston 18 can be formed in one piece with the cylinder jacket 16, this bottom wall being axially spaced from the bottom wall 24.
  • a pressure relief 40 can also be provided for the spring chamber 22.
  • the Bottom wall 24 expediently penetrates in a region diametrically offset from inlet opening 31, for example, by a transverse channel 41 lying approximately at right angles to the pump axis, bottom wall 24 in this region being able to form a projection projecting over the inside into the pre-suction chamber 15.
  • the transverse channel 41 also passes through the free end of the casing of the cover body 11 or its snap connection, so that it opens onto the inside of the cap 8, which forms an exit to the outside.
  • the cover body 11 Following the free end of the outer casing 13, the cover body 11 forms a section with a reduced width, on the inner circumference of which the cylinder casing 16 can be guided to a relatively large length with its outer circumference narrower than the inner circumference of the outer casing 13. Adjacent to this guide area, the cover body 11 forms an annular end wall, which is penetrated by the actuating plunger 19 or a plug-in connector of the discharge head 6 and on the inside of which the cylinder jacket 16 in the starting position strikes with a substantially flat surface of the outside of its end wall 27.
  • the inside of the annular transition section between the two jacket sections of the cover body 11 expediently strikes the free end face of the outer jacket 13.
  • the pump piston 18 protruding over the free end of the outer jacket 13 can lie essentially in any position in the longitudinal region of the narrower jacket section of the cover body 11, on which the cylinder jacket 16 is guided in any position.
  • a vent 42 is provided on the discharge device 1, one between the further jacket section of the lid body 11 and the Has outer casing 13 lying ventilation channel 43 which passes through the support flange 10 on the outside of the sleeve extension 35 and in the region of an opening of a seal which lies between the support flange and the end face of the neck 4.
  • the ventilation channel 43 opens into an annular space 44 on the side of the suction piston 17 facing away from the suction chamber 15 on the outer circumference of the cylinder jacket 16. From this chamber 44, a ventilation channel 45 leads to the opening between the inner circumference of the narrower jacket section of the cover body 11 and the outer circumference of the cylinder jacket 16 in the end wall of the lid body 11 and thus outside.
  • this end wall can be formed by an annular projection, so that there is an essentially tight contact and the ventilation 42 is closed like a valve in the starting position of the discharge device 1. At the beginning of the actuation stroke, this common ventilation valve for the annular space 44 and the media store 3 is opened.

Abstract

In a dispensing device (1), the return spring (21) of a return element (20) for a discharge pump (7) and for valves (26, 30) is located separated from the fluid in a tightly sealed spring chamber (22). The fluid inlet opening (31) into the discharge pump (7) is located eccentrically with respect to the latter and opens into an external, annular pre-intake chamber (15) from which the fluid passes via an intermediate valve (30) into the pump chamber (39). As a result, contact of the fluid with metallic parts is avoided and both favourable flow paths for the fluid and a compact design of the pump are obtained. <IMAGE>

Description

Die Erfindung betrifft eine Austragvorrichtung nach dem Oberbegriff des Patentanspruches 1. Sie ist für Medien vorgesehen und weist ein Gehäuse sowie eine Betätigung zur Durchführung eines einzigen oder mehrerer Austragvorgänge auf. Die Austragvorrichtung ist unabhängig davon, ob sie als manuell zu öffnendes Auslaßventil für Druckspeicher oder als manuell über einen Pumphub zu betätigende Austragpumpe ausgebildet ist, mit einer oder mehreren gesonderten Medienführungen versehen, die in der Regel von einem Medienspeicher bis zu einer ins Freie führenden Auslaßöffnung geführt sind. Ist die Austragvorrichtung im wesentlichen nur durch mindestens ein Auslaßventil gebildet, so kann die Medienführung den Medienspeicher, die Ventilschließflächen, ggf. einen zu diesen führenden Einlaßkanal und einen von diesen bis zur Auslaßöffnung führenden Auslaßkanal sowie die Auslaßöffnung selbst einschließen. Im Falle einer Pumpe schließt die Medienführung die ggf. gleichzeitig allein als Medienspeicher vorgesehene Pumpenkammer und meist auch mindestens ein Ventil ein, wobei mindestens ein Einlaßventil, mindestens ein Zwischenventil und/oder mindestens ein Auslaßventil vorgesehen sein kann. Die Austragvorrichtung kann zum einhändigen Gebrauch und zur nur manuell angetriebenen Betätigung ausgebildet sein.The invention relates to a discharge device according to the preamble of claim 1. It is intended for media and has a housing and an actuation for carrying out a single or more discharge processes. The discharge device is independent of whether it is designed as a manually opening outlet valve for pressure accumulators or as a discharge pump to be operated manually via a pump stroke, provided with one or more separate media guides, which as a rule lead from a media store to an outlet opening leading to the outside are. If the discharge device is formed essentially only by at least one outlet valve, the media guide can include the media store, the valve closing surfaces, possibly an inlet channel leading to these and an outlet channel leading from these to the outlet opening, and the outlet opening itself. In the case of a pump, the media guide includes the pump chamber, which may be provided solely as a media store, and usually also at least one valve, at least one inlet valve, at least one intermediate valve and / or at least one outlet valve being able to be provided. The discharge device can be used for one-handed use Use and be trained for manual operation only.

Ist die Austragvorrichtung nicht zur einmaligen, sondern zur wiederholbaren Betätigung bestimmt, so ist für die Betätigung für mindestens ein Ventil oder ähnliches eine Rückstellung vorgesehen, die beim Freigeben der Austragvorrichtung von der manuellen Einwirkung entsprechende Funktionsteile in eine Ausgangslage zurückführt. Ventile, Rückstellungen und ähnliche Funktionseinheiten von Austragvorrichtungen enthalten meist metallische Teile, z.B. Ventilkörper, Rückstellfedern oder dgl., deren metallische Oberfläche bei zahlreichen Medien, insbesondere pharmazeutischen und/oder kosmetischen Medien, zu unerwünschten Reaktionen führen können, wenn sie in Kontakt mit diesen Oberflächen gelangen. Auch können Medien solche Teile beschädigen, wenn es zu chemischen Reaktionen kommt. Dies betrifft insbesondere flüssige oder pasteuse Medien, jedoch können sich solche Nachteile auch bei anderen fließfähigen Medien ergeben.If the discharge device is not intended for a single but repeatable actuation, a reset is provided for the actuation for at least one valve or the like, which, when the discharge device is released, returns functional parts corresponding to the starting position from the manual action. Valves, resets and similar functional units of discharge devices mostly contain metallic parts, e.g. Valve bodies, return springs or the like., The metallic surface of which can lead to undesirable reactions in numerous media, in particular pharmaceutical and / or cosmetic media, when they come into contact with these surfaces. Media can also damage such parts if chemical reactions occur. This applies in particular to liquid or paste-like media, but such disadvantages can also arise with other flowable media.

Durch die FR-A-2 497 774 ist eine Austragvorrichtung mit einem Medien-Einlaß bekanntgeworden, welcher den Mantel einer Pumpkammer durchsetzend in diese Pumpkammer mündet. Der Einlaß liegt dabei im Abstand von der Bodenwand der Pumpkammer und ist an einen Medienkanal angeschlossen, welcher zwischen zwei ineinander gesteckten Napfkörpern begrenzt ist.From FR-A-2 497 774 a discharge device with a media inlet has become known, which opens through the jacket of a pumping chamber into this pumping chamber. The inlet lies at a distance from the bottom wall of the pumping chamber and is connected to a media channel which is delimited between two nested bodies.

Der Erfindung liegt die Aufgabe zugrunde, eine Austragvorrichtung der genannten Art zu schaffen, bei welcher Nachteile bekannter Ausbildungen bzw. der beschriebenen Art vermieden sind und die insbesondere zur Speicherung und zum Austrag von verhältnismäßig reaktionsfreudigen bzw. aggressiven Medien geeignet ist.The invention has for its object to provide a discharge device of the type mentioned, in which disadvantages of known designs or the type described are avoided and which is particularly suitable for storing and discharging relatively reactive or aggressive media.

Erfindungsgemäß ist die Austragvorrichtung nach Patentanspruch 1 ausgebildet. Zweckmäßig ist mindestens eine von ggf. mehreren Medienführungen von metallischen Oberflächen im wesentlichen vollständig frei und vorzugsweise ausschließvon Oberflächen begrenzt, die aus Kunststoff, Glas, keramischen Werkstoffen und/oder dgl. bestehen. Zweckmäßig enthält die Austragvorrichtung trotzdem dort metallische Bauteile, wo die Funktion durch solche Bauteile verbessert werden kann. Dies betrifft insbesondere die Verwendung mindestens einer, vorzugsweise einer einzigen Rückstellfeder, weil solche Rückstellfedern aus Metall meist wesentlich bessere Eigenschaften haben als Rückstellfedern aus anderen Werkstoffen.According to the discharge device is designed according to claim 1. Appropriately, at least one of possibly several media guides is essentially completely free of metallic surfaces and preferably excludes them Limited surfaces that consist of plastic, glass, ceramic materials and / or the like .. The discharge device still expediently contains metallic components where the function can be improved by such components. This applies in particular to the use of at least one, preferably a single return spring, because such return springs made of metal usually have much better properties than return springs made of other materials.

Es ist denkbar, mindestens ein metallisches Bauteil zwar innerhalb der Medienführung vorzusehen, jedoch durch geeignete Umschließung der Oberflächen einen direkten Kontakt mit dem Medium zu vermeiden. Vorteilhaft ist das jeweilige metallische Bauteil vollständig außerhalb der Medienführung in einer gegenüber dieser abgedichteten Aufnahmekammer angeordnet, so daß das Bauteil als ganzes nicht in Kontakt mit dem Medium gelangen kann. Im Falle einer Rückstellfeder ist diese Aufnahmekammer größenveränderbar, damit die Feder über den Federhub wirksam werden kann. Die Federkammer kann dabei durch einen Zylinder und einen in dieser verschiebbaren Hilfskolben begrenzt sein, wobei der Hilfskolben die Federkräfte überträgt. Bei einer bevorzugten Ausbildung ist nur eine einzige Rückstellfeder vorgesehen, während alle übrigen Bauteile der Austragvorrichtung bzw. zumindest diejenigen, die in Kontakt mit dem Medium gelangen, aus Kunststoff bzw. einem der genannten nichtmetallischen Werkstoffe bestehen.It is conceivable to provide at least one metallic component within the media guide, but to avoid direct contact with the medium by appropriately enclosing the surfaces. The respective metallic component is advantageously arranged completely outside of the media guide in a receiving chamber sealed with respect to it, so that the component as a whole cannot come into contact with the medium. In the case of a return spring, this receiving chamber can be resized so that the spring can take effect via the spring stroke. The spring chamber can be delimited by a cylinder and an auxiliary piston which can be displaced therein, the auxiliary piston transmitting the spring forces. In a preferred embodiment, only a single return spring is provided, while all other components of the discharge device or at least those that come into contact with the medium consist of plastic or one of the non-metallic materials mentioned.

Die der Erfindung zugrunde liegende Aufgabe kann unabhängig von der beschriebenen Ausbildung, insbesondere bei einer Austragvorrichtung mit Pumpe, auch dadurch gelöst werden, daß ein etwa in der Pumpenachse liegender Innenmantel des Gehäuses gegenüber der Medienführung dicht verschlossen ist und somit weder mit dem Saug- bzw. Einlaßkanal noch mit dem Auslaßkanal oder der Pumpenkammer kommuniziert. In diesem Fall liegt der Medieneinlaß in das Gehäuse seitlich so gegenüber dem Innenmantel versetzt, daß der in diesem abgeschlossene Raum von dem einströmenden Medium umgangen wird. Dadurch läßt sich eine besonders wirksame und schnelle Füllung des Gehäuses auch dann erreichen, wenn die in das Gehäuse mündende Einlaßöffnung ventilfrei ausgebildet ist. Die Einlaßöffnung mündet dabei zweckmäßig in eine den Innenmantel ringförmig umgebende Kammer, die als Vorsaugkammer ausgebildet sein kann und über ein Zwischenventil mit einer Pumpenkammer verbunden ist. Ist dieses Zwischenventil in Abhängigkeit von der jeweiligen Stellung der Austrag-Betätigung gesteuert, so kann es am Beginn des Förderhubes sehr präzise geschlossen werden.The object on which the invention is based can also be achieved independently of the design described, in particular in the case of a discharge device with a pump, in that an inner jacket of the housing lying approximately in the pump axis is sealed with respect to the media guide is closed and thus communicates neither with the suction or inlet channel nor with the outlet channel or the pump chamber. In this case, the media inlet in the housing is laterally offset from the inner casing in such a way that the enclosed space is bypassed by the inflowing medium. This enables a particularly effective and rapid filling of the housing to be achieved even if the inlet opening opening into the housing is designed to be valve-free. The inlet opening expediently opens into a chamber which surrounds the inner jacket in a ring, which can be designed as a pre-suction chamber and is connected to a pump chamber via an intermediate valve. If this intermediate valve is controlled as a function of the respective position of the discharge actuation, it can be closed very precisely at the beginning of the delivery stroke.

Die Rückstellfeder kann gleichzeitig zur Rückstellung der Austrag-Betätigung bzw. einer Betätigungshandhabe der gegeneinander bewegbaren, aus Pumpkolben und Pumpenzylinder bestehenden Pumpeneinheiten oder dgl. sowie zur Rückstellung mindestens eines Ventiles in eine Ausgangslage dienen. Zweckmäßig öffnet die Rückstellfeder bei der Rückstellung dabei das Zwischenventil, während sie am Beginn des Rückhubes das Auslaßventil schließt und über die Ventilschließflächen die Austrag-Betätigung zur Ausgangslage zurückführt.The return spring can simultaneously serve to reset the discharge actuation or an actuation handle of the mutually movable pump units consisting of pump pistons and pump cylinders or the like, as well as to return at least one valve to an initial position. The return spring expediently opens the intermediate valve during the return, while it closes the outlet valve at the beginning of the return stroke and returns the discharge actuation to the starting position via the valve closing surfaces.

Bei einer einfachen Ausführungsform trägt der Hilfskolben einen einteilig mit ihm ausgebildeten Ventilkörper, der dadurch druckabhängig gesteuert sein kann, daß der Hilfskolben an seiner von der abgeschlossenen Kammer abgekehrten Seite dem Druck in der Pumpenkammer ausgesetzt ist. Der Innenmantel kann mit seinem freien Ende gleichzeitig den diesen Ventilkörper umgebenden, gehäusefesten Pumpkolben bilden, der von dem mit der Austrag-Betätigung zu bewegenden Pumpenzylinder übergriffen wird, welcher seinerseits am Außenumfang einen Vorsaugkolben trägt und in einer den Ventilsitz des Auslaßventiles aufweisenden Stirnwand von einem Auslaßkanal durchsetzt ist, der zweckmäßig im wesentlichen in einem von dieser Stirnwand ausgehenden Betätigungsstößel liegt.In a simple embodiment, the auxiliary piston carries a valve body formed in one piece with it, which can be controlled in a pressure-dependent manner in that the auxiliary piston is exposed to the pressure in the pump chamber on its side facing away from the closed chamber. With its free end, the inner jacket can simultaneously form the valve piston surrounding this valve body, which is overlapped by the pump cylinder to be moved with the discharge actuation, which in turn carries a suction piston on the outer circumference and is penetrated by an outlet channel in an end wall having the valve seat of the outlet valve, which is expediently essentially in an actuating plunger extending from this end wall.

Die abgeschlossene Kammer kann sich nach außen über eine Bodenwand bzw. einen Stützflansch des Gehäuses hinaus erstrecken und dadurch mit dem vorstehenden Teil das zugehörige Ende des Einlaßkanales bzw. eines Steig- oder Saugrohres und dessen Steckanschluß übergreifen, so daß sich eine sehr geringe Axialerstreckung der Pumpe ergibt. Es ist auch denkbar, mehrere gegenüber der Medienführung abgeschlossene Kammern, Pumpenkammern oder dgl. vorzusehen.The closed chamber can extend outwards beyond a bottom wall or a support flange of the housing and thereby overlap with the projecting part the associated end of the inlet channel or a riser or suction pipe and its plug connection, so that there is a very small axial extent of the pump results. It is also conceivable to provide several chambers, pump chambers or the like which are sealed off from the media guide.

Ist für die jeweilige, gegenüber der Medienführung geschlossene Kammer eine Druckentlastung z.B. durch Belüftung vorgesehen, so umgeht ein Belüftungskanal zweckmäßig alle in Kontakt mit dem Medium kommenden Bereiche, wie den Medienspeicher, die Pumpenkammer, die Vorsaugkammer oder dgl., in dem der Belüftungskanal als Querkanal von der geschlossenen Kammer direkt zur Außenseite des Gehäuses und ins Freie geführt ist. Der Belüftungskanal kann dabei etwa an die Ebene der Innenseite des Gehäusebodens anschließen. Ist eine solche Druckentlastung nicht vorgesehen, so kann der Hilfskolben gemeinsam mit der geschlossenen Kammer auch nach Art einer Gasdruckfeder arbeiten. Eine Belüftung für den Medienspeicher und/oder den hinter dem Vorsaugkolben liegenden, nicht vom Medium beaufschlagten Gehäuseraum kann durch einen Belüftungskanal gebildet sein, der auf einem Teil seiner Länge zwischen einander übergreifenden Gehäuseteilen des Gehäuses und auf einem weiteren Teil seiner Länge zwischen einem dieser Gehäuseteile und dem mit der Austrag-Betätigung zu bewegenden Pumpenteil liegt, wobei diese beiden Teilabschnitte an den Ringraum hinter dem Vorsaugkolben anschließen.If pressure relief is provided for the respective chamber that is closed with respect to the media guide, for example by ventilation, then a ventilation channel expediently bypasses all areas that come into contact with the medium, such as the media reservoir, the pump chamber, the pre-suction chamber or the like, in which the ventilation channel acts as a transverse channel from the closed chamber directly to the outside of the housing and outside. The ventilation duct can connect approximately to the level of the inside of the housing base. If such pressure relief is not provided, the auxiliary piston can work together with the closed chamber in the manner of a gas pressure spring. Ventilation for the media reservoir and / or the housing space located behind the suction piston and not acted upon by the medium can be formed by an aeration channel be located on part of its length between overlapping housing parts of the housing and on a further part of its length between one of these housing parts and the pump part to be moved with the discharge actuation, these two sections connecting to the annular space behind the suction piston.

Diese und weitere Merkmale von bevorzugten Weiterbildungen gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird. Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher erläutert. In den Zeichnungen zeigen:

Fig. 1
eine erfindungsgemäße Austragvorrichtung im wesentlichen im Axialschnitt und
Fig. 2
einen Ausschnitt der Austragvorrichtung gemäß Fig. 1 in vergrößerter Darstellung und einer modifizierten Ausbildung.
These and other features of preferred further developments emerge from the claims and also from the description and the drawings, the individual features being realized individually and in groups in the form of sub-combinations in one embodiment of the invention and in other fields and being advantageous and can represent protective designs for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:
Fig. 1
a discharge device according to the invention essentially in axial section and
Fig. 2
a section of the discharge device according to FIG. 1 in an enlarged view and a modified design.

Die Austragvorrichtung 1 weist ein nur aus zwei einander über den größten Teil ihrer Länge übergreifenden Gehäuseteilen bestehendes Gehäuse 2 auf, das am Hals 4 eines Medienspeichers 3 zu befestigen ist und an dem davon abgekehrten Ende eine Austrag-Betätigung 5 mit einem manuell linear durch Fingerdruck zu verschiebenden Austragkopf 6 trägt. Im Gehäuse 2 ist eine Schubkolben-Pumpe 7 angeordnet, deren Pumpenteile mit dem Austragkopf 6 über einen Pumphub gegeneinander zu bewegen sind. Das Gehäuse 2 weist einen hohlen Grundkörper 9 mit einem über den Außenumfang ringförmig vorstehenden Stützflansch 10 auf, der mit einer das Gehäuse 2 im wesentlichen umgebenden Kappe 8 gegen den Hals 4 gespannt wird. Der Grundkörper 9 wird annähernd auf seiner ganzen, an den Stützflansch anschließenden Länge von einem napfförmigen Deckelkörper 11 eng am Außenumfang umschlossen. An der von seiner Stützfläche abgekehrten Stirnseite bildet der Stützflansch 10 eine Ringnut 12, in welche das freie Ende des Mantels des Deckelkörpers 11 eingreift und z.B. mit einer Schnappverbindung gesichert ist.The discharge device 1 has a housing 2 consisting of only two housing parts spanning the greater part of its length, which is to be fastened to the neck 4 of a media store 3 and at the end remote from it a discharge actuation 5 with a manually linear finger pressure moving discharge head 6 carries. A thrust piston pump 7 is arranged in the housing 2, the pump parts of which are connected to the discharge head 6 a pump stroke is to be moved against each other. The housing 2 has a hollow base body 9 with a support flange 10 projecting annularly over the outer circumference, which is clamped against the neck 4 with a cap 8 essentially surrounding the housing 2. The base body 9 is closely enclosed on its outer circumference by a cup-shaped cover body 11 approximately over its entire length adjoining the support flange. On the end face facing away from its support surface, the support flange 10 forms an annular groove 12 into which the free end of the casing of the cover body 11 engages and is secured, for example, with a snap connection.

Der Grundkörper 9 bildet einen die Ringnut 12 am Innenumfang begrenzenden und eng vom Deckelkörper 11 umschlossenen Außenmantel 13 sowie einen mit radialem Abstand innerhalb diesem liegenden, geringfügig längeren Innenmantel 14, zwischen denen zur Bildung einer Vorsaugkammer 15 ein Ringraum begrenzt ist. In diesen Ringraum greift ein mit dem Austragkopf 6 im wesentlichen starr verbundener Zylindermantel 16 ein, der im Bereich seines freien Endes einen sich zwischen zwei axial benachbarten Dichtlippen erstreckenden Vorsaugkolben 17 trägt. Der Vorsaugkolben 17 läuft dicht am Innenumfang des Außenmantels 13. Mit seinem Innenumfang bildet der Zylindermantel 16 eine Zylinderlaufbahn für einen Pumpkolben 18, welcher durch eine Dichtlippe am freien Ende des Innenmantels 15 gebildet ist. Der Zylindermantel 16 bzw. der Vorsaugkolben 17 ist über einen Betätigungsstößel 19 mit dem Austragkopf 6 durch eine Steckverbindung verbunden.The base body 9 forms an outer casing 13 which delimits the annular groove 12 on the inner circumference and is closely enclosed by the cover body 11, as well as a slightly longer inner casing 14 lying radially within it, between which an annular space is delimited to form a pre-suction chamber 15. A cylinder jacket 16, which is essentially rigidly connected to the discharge head 6, engages in this annular space and carries, in the region of its free end, a pre-suction piston 17 which extends between two axially adjacent sealing lips. The pre-suction piston 17 runs close to the inner circumference of the outer casing 13. With its inner circumference, the cylinder casing 16 forms a cylinder raceway for a pump piston 18, which is formed by a sealing lip at the free end of the inner casing 15. The cylinder jacket 16 or the pre-suction piston 17 is connected via an actuating plunger 19 to the discharge head 6 by a plug connection.

Zur Rückführung der Austrag-Betätigung 5 in die Ausgangsstellung ist eine Rückstellung 20 vorgesehen, die eine im wesentlichen innerhalb des Außenmantels 13 und des Innenmantels 14 liegende Rückstellfeder 21 aufweist. Diese liegt in einer abgedichteten Federkammer 22, welche an ihrem vom Medienspeicher 3 abgekehrten Ende von einem Hilfskolben 23 begrenzt ist, der mit zwei axial benachbarten Dichtlippen am Innenumfang des Innenmantels 14 geführt ist.To return the discharge actuation 5 to the initial position, a reset 20 is provided, which is essentially within the outer jacket 13 and the inner jacket 14 has return spring 21 lying. This lies in a sealed spring chamber 22, which is delimited at its end remote from the media store 3 by an auxiliary piston 23, which is guided with two axially adjacent sealing lips on the inner circumference of the inner jacket 14.

Das Gehäuse 2 weist eine Bodenwand 24 auf, die etwa in der Ebene des Stützflansches 10 liegt, die Ring- bzw. Vorsaugkammer 15 an einem Ende schließt und von deren Innenseite der Außenmantel 13 und der Innenmantel 14 einteilig frei abstehen. Im Bereich der Federkammer 22 ist die Bodenwand 24 mit einem napfförmig über ihre Außenseite vorstehenden Vorsprung 25 versehen, durch welchen die Federkammer 22 entsprechend verlängert ist und in welcher das zugehörige Ende der Rückstellfeder 21 ebenso wie im Innern des napfförmigen Hilfskolbens 23 zentriert abgestützt ist.The housing 2 has a bottom wall 24 which lies approximately in the plane of the support flange 10, closes the ring or pre-suction chamber 15 at one end and from the inside of which the outer jacket 13 and the inner jacket 14 project freely in one piece. In the area of the spring chamber 22, the bottom wall 24 is provided with a cup-shaped projection 25 protruding from its outside, through which the spring chamber 22 is correspondingly extended and in which the associated end of the return spring 21 is supported, as well as in the center of the cup-shaped auxiliary piston 23.

Dem freien Ende des Innenmantels 14 bzw. dem Pumpkolben 18 liegt ein Auslaßventil 26 gegenüber, dessen Ventilsitz etwa in der Pumpenachse an der Innenseite einer Stirnwand 27 des Zylindermantels 16 vorgesehen ist, welche wie der an sie anschließende Betätigungsstößel 19 von einem Auslaßkanal 28 durchsetzt ist. Der Auslaßkanal 28 führt zu der am Betätigungs- und Austragkopf 6 vorgesehenen Auslaßöffnung 29, die durch eine Düse gebildet sein kann. Die Rückstellfeder 21 belastet das Auslaß-Ventil 26 zur geschlossenen Stellung.The free end of the inner jacket 14 or the pump piston 18 is opposite an outlet valve 26, the valve seat of which is provided approximately in the pump axis on the inside of an end wall 27 of the cylinder jacket 16, which, like the actuating plunger 19 adjoining it, is penetrated by an outlet channel 28. The outlet channel 28 leads to the outlet opening 29 provided on the actuating and discharge head 6, which can be formed by a nozzle. The return spring 21 loads the outlet valve 26 to the closed position.

Durch den Zylindermantel 16, den Pumpkolben 18, den Hilfskolben 23 und die Stirnwand 27 ist die im Querschnitt ringförmige Pumpenkammer 39 begrenzt, welche mit der Vorsaugkammer 15 über ein hubabhängig arbeitendes Zwischen-Ventil 30 verbunden ist. Dessen Ventilteile sind einteilig mit dem Pumpkolben 18 bzw. dem Zylindermantel 16 und dem Vorsaugkolben 17 ausgebildet und arbeiten als Schieberventil. In der Laufbahn des Zylindermantels 16 sind Längsschlitze vorgesehen, die die Vorsaugkammer 15 mit der Pumpenkammer 39 etwa so lange verbinden, bis der Pumpkolben 18 die erste Hälfte seines Pumphubes bzw. die letzte Hälfte seines Rückhubes durchgeführt hat; auf dem restlichen Teilhub ist das Ventil 30 jeweils geschlossen.The cylinder jacket 16, the pump piston 18, the auxiliary piston 23 and the end wall 27 delimit the pump chamber 39, which is ring-shaped in cross section and is connected to the pre-suction chamber 15 via an intermediate valve 30 which operates in a stroke-dependent manner. Whose valve parts are integrally formed with the pump piston 18 or the cylinder jacket 16 and the pre-suction piston 17 and work as a slide valve. In the race of the cylinder jacket 16, longitudinal slots are provided which connect the pre-suction chamber 15 to the pump chamber 39 until the pump piston 18 has carried out the first half of its pumping stroke or the last half of its return stroke; valve 30 is closed on the remaining partial stroke.

Die Bodenwand der Vorsaugkammer 15 wird von einer Einlaßöffnung 31 durchsetzt, die somit dem vorderen Ende des Vorsaugkolbens 17 im wesentlichen in jeder Stellung im Abstand gegenüberliegt und gegenüber der Bodenwand 24 nicht nach innen versetzt ist. Die Einlaßöffnung 31 ist über einen Einlaßkanal 32 mit dem Bodenbereich des Medienspeichers 3 leitungsverbunden. Ein den Einlaßkanal 32 im wesentlichen vollständig bildendes Steigrohr 33 ist in einen außerhalb der Pumpenachse und etwa parallel zu dieser liegenden Steckanschluß 34 des Grundkörpers 9 eingesteckt und kann annähernd bis in den Bereich der Bodenwand 24 reichen. Über die Außenseite der Bodenwand 24 steht in der Pumpenachse ein Hülsenansatz 35 des Grundkörpers 9 vor, der eine kleinere Weite als der Außenmantel 13 und eine größere Weite als der Innenmantel 14 hat und der verhältnismäßig eng an die Innenweite des Halses 4 angepaßt ist, so daß er nur mit geringem Spaltabstand von dessen Innenumfang liegt. Der Hülsenansatz 35 steht über den in ihm liegenden Vorsprung 25 vor, welcher mit einem Mantelbereich einen anschließenden Mantelbereich des hülsenförmigen Steckanschlusses 34 bildet, dessen davon abgekehrter Mantelbereich durch einen Mantelabschnitt des Hülsenansatzes 35 gebildet ist, so daß der Steckanschluß 34 unmittelbar an der Innenseite des Hülsenansatzes 35 liegt. Das Steigrohr 33 kann sich dadurch über einen Längsabschnitt der Austragvorrichtung erstrecken, über welchen sich auch die Rückstellfeder 21 erstreckt.The bottom wall of the pre-suction chamber 15 is penetrated by an inlet opening 31, which thus is at a distance from the front end of the pre-suction piston 17 essentially in any position and is not offset inwards relative to the bottom wall 24. The inlet opening 31 is connected to the bottom region of the media store 3 via an inlet channel 32. A riser pipe 33, which essentially forms the inlet channel 32, is inserted into a plug connection 34 of the base body 9 lying outside the pump axis and approximately parallel to it, and can extend approximately into the region of the bottom wall 24. Over the outside of the bottom wall 24 is in the pump axis a sleeve extension 35 of the base body 9, which has a smaller width than the outer jacket 13 and a larger width than the inner jacket 14 and which is relatively closely matched to the inside width of the neck 4, so that it lies only with a small gap distance from its inner circumference. The sleeve extension 35 protrudes beyond the projection 25 located in it, which forms with a jacket region a subsequent jacket region of the sleeve-shaped plug connection 34, the jacket region thereof facing away from which is formed by a jacket section of the sleeve extension 35, so that the plug connection 34 is directly on the inside of the sleeve extension 35 lies. The riser pipe 33 can thereby extend over a longitudinal section extend the discharge device, over which the return spring 21 also extends.

Von der Innenseite der Stirnwand 27 steht gegen den Pumpkolben 18 ein ringförmiger, am Außenumfang spitzwinklig konischer und am Innenumfang im wesentlichen zylindrischer Verdrängungsvorsprung 36 vor, dessen im Abstand von der Zylinderlaufbahn liegendem Außenumfang eine komplementär angepaßte, trichterförmig erweitere Öffnung 37 am Pumpkolben 18 zugeordnet ist, die durch den Innenumfang der Kolbenlippe gebildet ist. Der Innenumfang des Verdrängungsvorsprunges 36 ist verhältnismäßig eng an den Außenumfang des hohlmantelförmigen und am Ende kegelförmig geschlossenen Ventilkörpers 38 des Auslaß-Ventiles 26 angepaßt, der in die vom Verdrängungsvorsprung 36 begrenzte Vertiefung in der Stirnwand 27 eingreift, mit dem Innenumfang des Verdrängungskörpers 36 einen Ringspalt begrenzt und mit seinem kegelförmigen Ende den am Vertiefungsboden liegenden Ventilsitz öffnet und schließt. Der Ventilkörper 38 steht nach hinten einteilig über den Hilfskolben 23 vor, überragt das freie Ende des Pumpkolbens 18 und hat gegenüber dem Hilfskolben 23 eine kleinere Weite, so daß er berührungsfrei vorsteht.From the inside of the end wall 27 protrudes against the pump piston 18 an annular displacement projection 36 which is conical on the outer circumference at an acute angle and essentially cylindrical on the inner circumference, the outer circumference of which is at a distance from the cylinder raceway and is associated with a complementarily adapted, funnel-shaped opening 37 on the pump piston 18. which is formed by the inner circumference of the piston lip. The inner circumference of the displacement projection 36 is relatively closely matched to the outer circumference of the hollow jacket-shaped and at the end conically closed valve body 38 of the outlet valve 26, which engages in the recess delimited by the displacement projection 36 in the end wall 27 and delimits an annular gap with the inner circumference of the displacement body 36 and opens and closes with its conical end the valve seat lying on the recess bottom. The valve body 38 projects in one piece towards the rear over the auxiliary piston 23, projects beyond the free end of the pump piston 18 and has a smaller width than the auxiliary piston 23, so that it protrudes without contact.

Die Austragvorrichtung 1 arbeitet nach folgendem Verfahren: In der Ausgangsstellung liegen der Vorsaugkolben 17 und der Hilfskolben 23, die etwa gleiche Axialerstreckung haben, im wesentlichen im selben Längsabschnitt der Austragvorrichtung, während der Pumpkolben 18 im axialen Abstand davon näher bei dem Austragkopf 6 liegt. Durch Niederdrücken des Austragkopfes 6 an dessen freier Stirnfläche wird die Pumpenkammer 39, die mit Medium gefüllt angenommen wird, verengt, so daß bei geschlossenem Auslaß-Ventil 26 zunächst Medium aus der Pumpenkammer 39 über das Ventil 30 zurück in die Vorsaugkammer 15 und in den Medienspeicher 3 gedrückt wird. Sobald das Ventil 30 dadurch geschlossen ist, daß die Dichtlippe des Pumpkolbens 18 die zugehörigen Enden der Längsschlitze überfahren hat, wird in der Pumpenkammer 39 bei weiterer Betätigung ein Druck aufgebaut, der auf das von der Federkammer 22 abgekehrte, den Ventilkörper 38 umgebende Ende des Hilfskolbens 23 und entgegen der Rückstellfeder 21 wirkt.The discharge device 1 works according to the following method: In the initial position, the pre-suction piston 17 and the auxiliary piston 23, which have approximately the same axial extent, lie essentially in the same longitudinal section of the discharge device, while the pump piston 18 lies closer to the discharge head 6 at an axial distance therefrom. By depressing the discharge head 6 on its free end face, the pump chamber 39, which is assumed to be filled with medium, is narrowed, so that when the outlet valve 26 is closed, medium is first drawn out of the pump chamber 39 via the Valve 30 is pressed back into the pre-suction chamber 15 and into the media storage 3. As soon as the valve 30 is closed in that the sealing lip of the pump piston 18 has passed over the associated ends of the longitudinal slots, a pressure is built up in the pump chamber 39 upon further actuation, which pressure acts on the end of the auxiliary piston which surrounds the valve body 38 and is remote from the spring chamber 22 23 and acts against the return spring 21.

Sobald der Druck die Federkraft übersteigt, wird der Hilfskolben 23 einschließlich des Ventilkörpers 38 gegen die Bodenwand 24 bewegt, so daß der Ventilkörper 38 vom Ventilsitz abhebt und das Auslaß-Ventil 26 öffnet. Während des restlichen Teilhubes dringt der Verdrängungsvorsprung 36 vollends in die Öffnung 37 ein, so daß das Medium in den Auslaßkanal 28 ausgepreßt wird. Am Ende des Pumphubes schlägt das Ende des Pumpkolbens 18 an der Innenseite der Stirnwand 27 und/oder das Ende des Vorsaugkolbens 17 an der Innenseite der Bodenwand 24 an, wobei der Druck in der Pumpenkammer 39 durch das ausströmende Medium absinkt. Dadurch wird der Hilfskolben 23 unter der Kraft der Rückstellfeder 21 in seine Schließlage zurückbewegt, wodurch die Pumpenkammer nochmals verengt und Medium während des Schließens des Ventiles 26 unter Druck in den Auslaßkanal 28 gepreßt wird, so daß sich am Ende des Austrages nochmals ein Pumpstoß ergibt, durch den ein Nachtropfen des Mediums aus der Auslaßöffnung 29 vermieden werden kann.As soon as the pressure exceeds the spring force, the auxiliary piston 23 including the valve body 38 is moved against the bottom wall 24, so that the valve body 38 lifts off the valve seat and the outlet valve 26 opens. During the remaining partial stroke, the displacement projection 36 penetrates completely into the opening 37, so that the medium is pressed out into the outlet channel 28. At the end of the pump stroke, the end of the pump piston 18 strikes the inside of the end wall 27 and / or the end of the pre-suction piston 17 hits the inside of the bottom wall 24, the pressure in the pump chamber 39 dropping due to the medium flowing out. As a result, the auxiliary piston 23 is moved back into its closed position under the force of the return spring 21, as a result of which the pump chamber is narrowed again and medium is pressed under pressure into the outlet channel 28 during the closing of the valve 26, so that there is another pump surge at the end of the discharge. through which dripping of the medium from the outlet opening 29 can be avoided.

Der Ventilkörper 38 liegt nun als Mitnehmer an dem bewegbaren Pumpenteil an. Wird dieser Pumpenteil durch Loslassen des Austragkopfes 6 freigegeben, so wird er über die aneinanderliegenden Ventilflächen des Auslaß-Ventiles 26 durch die Rückstellfeder 21 in seine Ausgangsstellung zurückbewegt. Während dieses Rückhubes wird zunächst, nämlich bis zum Öffnen des Ventiles 30, in der Pumpenkammer 39 ein Unterdruck aufgebaut und dann durch Öffnen des Ventiles 30 schlagartig die Verbindung zwischen der Pumpenkammer 39 und der Vorsaugkammer 15 hergestellt. Gleichzeitig wird während des Rückhubes die Vorsaugkammer 15 erweitert und dadurch über den Einlaßkanal 32 Medium aus dem Medienspeicher 3 in die Vorsaugkammer 15 angesaugt. Sobald das Ventil 30 öffnet, wird schlagartig Medium aus der Vorsaugkammer 15 in die Pumpenkammer 39 angesaugt, die dadurch vollständig gefüllt wird. Der Unterdruck in der Pumpenkammer 39 wirkt über den Hilfskolben 23 verstärkend auf den Schließdruck des Auslaßventiles 26.The valve body 38 is now in contact with the movable pump part. If this pump part is released by releasing the discharge head 6, then it is moved back into its starting position by the return spring 21 via the valve surfaces of the outlet valve 26 lying against one another. During this return stroke, namely until the valve 30 opens, a negative pressure is built up in the pump chamber 39 and then suddenly the connection between the pump chamber 39 and the pre-suction chamber 15 is established by opening the valve 30. At the same time, the pre-suction chamber 15 is expanded during the return stroke and, as a result, medium is sucked into the pre-suction chamber 15 via the inlet channel 32 from the media store 3. As soon as the valve 30 opens, medium is suddenly sucked out of the pre-suction chamber 15 into the pump chamber 39, which is thereby completely filled. The negative pressure in the pump chamber 39 has a reinforcing effect on the closing pressure of the outlet valve 26 via the auxiliary piston 23.

Die Einlaßöffnung 31 bzw. der Einlaßkanal 32 bedarf durch die beschriebene Ausbildung keines besonderen Einlaßventiles, so daß die Leitungsverbindung zwischen dem Medienspeicher 3 und der Vorsaugkammer 15 stets geöffnet ist. Die Füllung der Pumpenkammer 39 erfolgt von außen radial nach innen bzw. von einer volumengrößeren Vorsaugkammer 15 zu einer volumenkleineren Pumpenkammer 39, da die Vorsaugkammer 15 in Axialansicht die Pumpenkammer 39 wenigstens teilweise umgibt. Da der Verdrängungsvorsprung 36 in Pumphubendlage die Öffnung 37 im wesentlichen vollständig ausfüllt, ist die in der Pumpenkammer 39 verbleibende Restmenge an Medium sehr klein. Durch den an dem Pumpkolben 18 verschiebbar gelagerten Ventilkörper 38 kann die durch die Stirnwand 27 gebildete, dem Pumpkolben 18 gegenüberliegenden Bodenwand der Pumpenkammer 39 durchgehend einteilig mit dem Zylindermantel 16 ausgebildet sein, wobei diese Bodenwand der Bodenwand 24 im axialen Abstand gegenüberliegt.Due to the design described, the inlet opening 31 or the inlet channel 32 does not require any special inlet valve, so that the line connection between the media store 3 and the pre-suction chamber 15 is always open. The pump chamber 39 is filled from the outside radially inwards or from a larger-volume pre-suction chamber 15 to a smaller-volume pump chamber 39, since the pre-suction chamber 15 at least partially surrounds the pump chamber 39 in an axial view. Since the displacement projection 36 in the pump stroke end position essentially completely fills the opening 37, the remaining amount of medium remaining in the pump chamber 39 is very small. Due to the valve body 38 slidably mounted on the pump piston 18, the bottom wall of the pump chamber 39 formed by the end wall 27 and opposite the pump piston 18 can be formed in one piece with the cylinder jacket 16, this bottom wall being axially spaced from the bottom wall 24.

Gemäß Fig. 2 kann für die Federkammer 22 auch eine Druckentlastung 40 vorgesehen sein. Zu diesem Zweck ist die Bodenwand 24 zweckmäßig in einem gegenüber der Einlaßöffnung 31 z.B. diametral versetzten Bereich von einem etwa rechtwinklig zur Pumpenachse liegenden Querkanal 41 durchsetzt, wobei die Bodenwand 24 in diesem Bereich einen über ihre Innenseite stegförmig in die Vorsaugkammer 15 vorstehenden Vorsprung bilden kann. Der Querkanal 41 durchsetzt außer den Grundkörper 9 auch das freie Ende des Mantels des Deckelkörpers 11 bzw. dessen Schnappverbindung, so daß er an der Innenseite der Kappe 8 mündet, die einen Ausgang ins Freie bildet.2, a pressure relief 40 can also be provided for the spring chamber 22. For this purpose, the Bottom wall 24 expediently penetrates in a region diametrically offset from inlet opening 31, for example, by a transverse channel 41 lying approximately at right angles to the pump axis, bottom wall 24 in this region being able to form a projection projecting over the inside into the pre-suction chamber 15. In addition to the base body 9, the transverse channel 41 also passes through the free end of the casing of the cover body 11 or its snap connection, so that it opens onto the inside of the cap 8, which forms an exit to the outside.

Der Deckelkörper 11 bildet im Anschluß an das freie Ende des Außenmantels 13 einen in der Weite reduzierten Abschnitt, an dessen Innenumfang der Zylindermantel 16 mit seinem gegenüber dem Innenumfang des Außenmantels 13 engeren Außenumfang auf verhältnismäßig große Länge geführt sein kann. Benachbart zu diesem Führungsbereich bildet der Deckelkörper 11 eine ringförmige Stirnwand, welche vom Betätigungsstößel 19 bzw. einem Steckstutzen des Austragkopfes 6 durchsetzt wird und an deren Innenseite der Zylindermantel 16 in der Ausgangsstellung mit einer im wesentlichen ebenen Fläche der Außenseite seiner Stirnwand 27 anschlägt. Der ringförmige Übergangsabschnitt zwischen den beiden Mantelabschnitten des Deckelkörpers 11 schlägt mit seiner Innenseite zweckmäßig an der freien Stirnfläche des Außenmantels 13 an. Der über das freie Ende des Außenmantels 13 vorstehende Pumpkolben 18 kann im wesentlichen in jeder Stellung im Längsbereich des engeren Mantelabschnittes des Deckelkörpers 11 liegen, an welchem der Zylindermantel 16 in jeder Stellung geführt ist.Following the free end of the outer casing 13, the cover body 11 forms a section with a reduced width, on the inner circumference of which the cylinder casing 16 can be guided to a relatively large length with its outer circumference narrower than the inner circumference of the outer casing 13. Adjacent to this guide area, the cover body 11 forms an annular end wall, which is penetrated by the actuating plunger 19 or a plug-in connector of the discharge head 6 and on the inside of which the cylinder jacket 16 in the starting position strikes with a substantially flat surface of the outside of its end wall 27. The inside of the annular transition section between the two jacket sections of the cover body 11 expediently strikes the free end face of the outer jacket 13. The pump piston 18 protruding over the free end of the outer jacket 13 can lie essentially in any position in the longitudinal region of the narrower jacket section of the cover body 11, on which the cylinder jacket 16 is guided in any position.

Für den Medienspeicher 3 ist an der Austragvorrichtung 1 eine Belüftung 42 vorgesehen, die einen zwischen dem weiteren Mantelabschnitt des Deckelkörpers 11 und dem Außenmantel 13 liegenden Belüftungskanal 43 aufweist, der den Stützflansch 10 an der Außenseite des Hülsenansatzes 35 und im Bereich einer Öffnung einer Dichtung durchsetzt, welche zwischen dem Stützflansch und der Stirnfläche des Halses 4 liegt. Der Belüftungskanal 43 mündet in einen Ringraum 44 auf der von der Vorsaugkammer 15 abgekehrten Seite des Vorsaugkolbens 17 am Außenumfang des Zylindermantels 16. Von diesem Raum 44 führt zwischen dem Innenumfang des engeren Mantelabschnittes des Deckelkörpers 11 und dem Außenumfang des Zylindermantels 16 ein Belüftungskanal 45 zur Öffnung in der Stirnwand des Deckelkörpers 11 und damit ins Freie. Die Anschlagfläche dieser Stirnwand kann durch einen Ringvorsprung gebildet sein, so daß sich eine im wesentlichen dichte Anlage ergibt und die Belüftung 42 in der Ausgangsstellung der Austragvorrichtung 1 ventilartig geschlossen ist. Mit Beginn des Betätigungshubes wird dieses gemeinsame Belüftungsventil für den Ringraum 44 und den Medienspeicher 3 geöffnet.For the media store 3, a vent 42 is provided on the discharge device 1, one between the further jacket section of the lid body 11 and the Has outer casing 13 lying ventilation channel 43 which passes through the support flange 10 on the outside of the sleeve extension 35 and in the region of an opening of a seal which lies between the support flange and the end face of the neck 4. The ventilation channel 43 opens into an annular space 44 on the side of the suction piston 17 facing away from the suction chamber 15 on the outer circumference of the cylinder jacket 16. From this chamber 44, a ventilation channel 45 leads to the opening between the inner circumference of the narrower jacket section of the cover body 11 and the outer circumference of the cylinder jacket 16 in the end wall of the lid body 11 and thus outside. The stop surface of this end wall can be formed by an annular projection, so that there is an essentially tight contact and the ventilation 42 is closed like a valve in the starting position of the discharge device 1. At the beginning of the actuation stroke, this common ventilation valve for the annular space 44 and the media store 3 is opened.

Claims (10)

  1. Discharge apparatus for media with a casing (2), a discharge actuating means (5), a medium guide located between the medium reservoir (3) and an outlet (29), as well as with at least one chamber (15) located in the medium guide and a medium inlet (31) laterally displaced with respect to its central axis and having a bottom wall (24) and in which at least one restoring means (20) of the discharge actuating means (5) having at least one substantially encapsulated restoring spring (21) is provided, characterized in that the medium inlet (31) passes through the bottom wall (24) and issues into the chamber (15).
  2. Discharge apparatus according to claim 1, characterized in that the medium guide is substantially free from metal surfaces and/or at least one restoring spring (21) is in a discharge pump (7), the restoring spring (21) being located in a spring chamber (22) substantially tightly closed with respect to the medium guide and in particular as a helical compression spring is supported on an auxiliary piston (23) approximately in the pump axis and which is guided on a running path of the spring chamber (22) and transfers the restoring force to one of the two pump parts movable against one another.
  3. Discharge apparatus according to claim 2, characterized in that an inlet opening (31) of the medium inlet-forming inlet channel (32) for a pump chamber (39) of the discharge pump (7) issues in laterally displaced manner into the pump, particularly into an annular presuction chamber (15) relative to a spring chamber (22) and/or a pump axis and is connected by means of an intermediate valve (30) to the pump chamber (39) and an inner boundary of the presuction chamber (15) substantially coincides with an outer boundary of the pump chamber (39) and/or the presuction chamber (15) and the pump chamber (39) axially succeed one another.
  4. Discharge apparatus according to any one of the preceding claims, characterized in that the discharge pump (7) has an inner jacket (14), partly bounding a pump chamber (39) and freely projecting from a casing bottom wall (24) of a cylinder casing and whose end associated with the bottom wall (24) is substantially tightly closed with respect to the medium guide and which receives the auxiliary piston (23), engages in a presuction piston (17) and/or forms with its free end a pump piston (18).
  5. Discharge apparatus according to any one of the preceding claims, characterized in that the restoring means (20), particularly a single restoring spring (21) for returning the discharge pump (7) and/or at least one valve (26, 30) into a starting position, or for returning a delivery valve (26) into a closed position and/or the intermediate valve (30) in an open position and preferably the auxiliary piston (23) carries a valve body (38), which in the restoring direction of the discharge pump (7) is loaded against a valve seat by the restoring spring (21).
  6. Discharge apparatus according to claims 4 or 5, characterized in that the at least one inner jacket (14) with its free end and with the associated end of the auxiliary piston (23) bounds the pump chamber (39) on an end face and is surrounded by the presuction piston (17), which forms the circumference, the facing end of the pump chamber (39), the valve seat of a delivery valve (26) and/or a valve part of the intermediate valve (30), which is preferably in the form of a stroke-dependent closing control valve by the inner circumference of a cylinder jacket (16) of the presuction piston (17) and a piston lip of the pump piston (18).
  7. Discharge apparatus according to any one of the claims 4 to 6, characterized in that a valve body (38) of a delivery valve (26) projects over the free end of the at least one inner jacket (14) and/or, facing said free end on the associated end face of the pump chamber (39) is provided a projecting displacement projection (36) for engagement in a funnel-shaped widened end portion of the inner jacket (14) and in the end wall (27) of the cup-shaped presuction piston (17) is located the valve seat of the delivery valve (26) and is surrounded by the displacement projection (36).
  8. Discharge apparatus according to any one of the claims 2 to 7, characterized in that the casing (2) has on the outer circumference a support flange (10) for supporting on the medium reservoir (3) and comprises a body (9), as well as a cover (11) surrounding same at the outer circumference up to the support flange (10) and which preferably engages with one end in a circular groove (12) of the body (9) and/or forms with a jacket portion a guide for a cylinder jacket (16) of the discharge pump (7) and/or that the casing (2) has a sleeve step (35) freely projecting over the outside of a casing bottom wall (24), in which is located an eccentric plug-in connection (34) for a riser (33) and/or a projecting area of the spring chamber (22).
  9. Discharge apparatus according to any one of the preceding claims, characterized in that at least one spring chamber (22) for the restoring spring (21) is provided with a pressure relief means (40), which is closed relative to the medium guide and which preferably has at least one transverse channel (41) emanating from the spring chamber (22) and traversing the casing (2) in the vicinity of a base wall (24), whilst being guided to the outside of the casing (2).
  10. Discharge apparatus according to any one of the preceding claims, characterized in that a ventilating means (42) for the medium reservoir (3) is substantially completely separated from at least one spring chamber (22) for the restoring spring and/or the medium guide and preferably has at least one ventilating channel (43, 45) emanating from the support flange (10) between the body (9) and the cover (11) and which is in particular connected to an annular space (44) positioned behind the presuction piston (17).
EP91118678A 1990-11-09 1991-11-01 Dispensing device for fluids Expired - Lifetime EP0484835B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4035663 1990-11-09
DE4035663A DE4035663A1 (en) 1990-11-09 1990-11-09 DISCHARGE DEVICE FOR MEDIA

Publications (2)

Publication Number Publication Date
EP0484835A1 EP0484835A1 (en) 1992-05-13
EP0484835B1 true EP0484835B1 (en) 1995-03-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91118678A Expired - Lifetime EP0484835B1 (en) 1990-11-09 1991-11-01 Dispensing device for fluids

Country Status (6)

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US (1) US5437398A (en)
EP (1) EP0484835B1 (en)
JP (1) JP3157879B2 (en)
AT (1) ATE120385T1 (en)
DE (2) DE4035663A1 (en)
ES (1) ES2070392T3 (en)

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FR2754316B1 (en) * 1996-10-04 1998-11-13 Teleplastics Ind PRE-PRESSURE PUMP FOR DISPENSING LIQUID DOSES AND DISPENSER COMPRISING SAME
DE19807922A1 (en) 1998-02-25 1999-08-26 Pfeiffer Erich Gmbh & Co Kg Media Donor
US6186368B1 (en) * 1999-05-26 2001-02-13 Michael Gene Knickerbocker Manually actuated pump assembly
DE19960459A1 (en) 1999-12-15 2001-06-21 Pfeiffer Erich Gmbh & Co Kg Media Donor
MXPA05006300A (en) * 2002-12-13 2005-08-29 Incro Ltd Improvements in or relating to pump-action nozzle devices.
FR2933679B1 (en) * 2008-07-10 2010-09-03 Valois Sas DEVICE FOR DISPENSING FLUID PRODUCT.
EP2547455B1 (en) * 2010-03-17 2015-10-21 Ipn Ip B.V. Container with a portion dispensing device
BR112014006659B1 (en) 2011-09-20 2020-09-01 Dispensing Technologies B.V. LIQUID DISTRIBUTION DEVICE AND METHOD AND LIQUID SPRAYING FROM A DEVICE
DE102016014898A1 (en) 2016-12-12 2018-06-14 Aptar Dortmund Gmbh Pump and dispenser
JP2022535154A (en) 2019-07-18 2022-08-04 ジェーベー デヴェロップメント fluid distribution device
FR3098734A1 (en) * 2019-07-18 2021-01-22 Gb Developpement Fluid dispenser

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US3146920A (en) * 1962-03-08 1964-09-01 Mead Johnson & Co Dispenser for metered amounts of fluid
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Also Published As

Publication number Publication date
DE59105049D1 (en) 1995-05-04
JP3157879B2 (en) 2001-04-16
US5437398A (en) 1995-08-01
EP0484835A1 (en) 1992-05-13
ATE120385T1 (en) 1995-04-15
JPH04282084A (en) 1992-10-07
DE4035663A1 (en) 1992-05-14
ES2070392T3 (en) 1995-06-01

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