EP3508280B1 - Application device for applying liquid media - Google Patents

Application device for applying liquid media Download PDF

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Publication number
EP3508280B1
EP3508280B1 EP18204255.6A EP18204255A EP3508280B1 EP 3508280 B1 EP3508280 B1 EP 3508280B1 EP 18204255 A EP18204255 A EP 18204255A EP 3508280 B1 EP3508280 B1 EP 3508280B1
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EP
European Patent Office
Prior art keywords
piston
opening
pump chamber
air supply
inlet opening
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.)
Active
Application number
EP18204255.6A
Other languages
German (de)
French (fr)
Other versions
EP3508280A1 (en
Inventor
Stefan Christ
Andreas Mersmann
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.)
Aero Pump GmbH
Original Assignee
Aero Pump GmbH
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Filing date
Publication date
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Publication of EP3508280A1 publication Critical patent/EP3508280A1/en
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Publication of EP3508280B1 publication Critical patent/EP3508280B1/en
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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
    • 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
    • B05B11/1002—Piston pumps the direction of the pressure stroke being substantially perpendicular to the major axis of the container
    • 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
    • B05B11/1015—Piston pumps actuated without substantial movement of the nozzle in the direction of the pressure stroke
    • 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
    • B05B11/1052—Actuation means
    • 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
    • B05B11/0005—Components or details
    • B05B11/0062—Outlet valves actuated by the pressure of the fluid to be sprayed
    • B05B11/0064—Lift valves
    • B05B11/0067—Lift valves having a valve seat located downstream the valve element (take precedence)
    • 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
    • B05B11/105—Sealing arrangements around pump actuating stem
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/58—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter preventing deposits, drying-out or blockage by recirculating the fluid to be sprayed from upstream of the discharge opening back to the supplying means

Definitions

  • the invention relates to a discharge device for discharging liquid media from a container with a pump chamber according to the preamble of claim 1.
  • Such a discharge device is, for example, from U.S. 4,944,431 A known.
  • Another discharge device is, for example, off DE 28 37 355 A1 known.
  • Such a discharge device is used, for example, to discharge a dose of a medicament which is in liquid form.
  • the medium can be atomized, for example, as in the case of a nasal spray or a throat spray.
  • the piston which is usually connected to a handle for this purpose, is moved in the pump chamber. This reduces the volume of the pump chamber. To the extent that the volume is reduced, the medium is pumped out of the pump chamber through the outlet opening and ultimately discharged from the device. With a return stroke of the piston, the volume of the pump chamber is increased again. The medium can then flow into the pump chamber through the inlet opening, so that the pump chamber is filled again for the next actuation stroke of the piston.
  • WO 02/094708 A1 shows a metering pump with a pump chamber, which has an inlet opening and an outlet opening, and a piston which is slidably mounted in the pump chamber. At one end, the piston has a sealing lip arrangement which enters a metering chamber and closes the metering chamber.
  • the dosing chamber is connected to a pressure-controlled outlet valve.
  • a similar design is off DE 60 2004 008 340 T2 known.
  • a sealing lip is provided on a valve seat in which the extension of the piston enters.
  • EP 0 738 542 A1 shows a further discharge device with a piston which has a sealing lip resting against an inner wall of a cylinder, with an annular gap being provided between the piston and the cylinder which is connected to a ventilation opening. At the end of a delivery stroke, the sealing lip is partially lifted off the inner wall of the cylinder so that pressure can be equalized towards the ventilation opening.
  • the inlet opening is closed with a piston stroke in the conveying direction and released again with a return stroke.
  • the object of the invention is to enable precise metering of an output quantity of the medium.
  • the predetermined stroke of the piston can be relatively small.
  • the extension then enters the inlet opening shortly after the start of the stroke.
  • the inlet opening is closed immediately so that no medium can be conveyed out of the pump chamber through the inlet opening.
  • the start of a delivery stroke is thus defined very precisely. If the start of a delivery stroke is clearly defined, the amount of medium dispensed can be dosed relatively precisely.
  • a pressure-controlled outlet valve opens when a first predetermined pressure is exceeded on its input side and closes when it falls below a predetermined pressure on its input side.
  • the first pressure and the second pressure can be the same. But they can also be different.
  • the inlet opening is undersized compared to a cross section of the extension.
  • the inlet opening must therefore widen slightly when the extension enters it. When using plastic materials, however, this is generally possible without any problems, without a user having to apply greater forces here. If the inlet opening is undersized, a good seal is obtained at the moment when the extension enters the inlet opening, with which medium is prevented from escaping through the inlet opening from the pump chamber.
  • the inlet opening preferably has a sealing lip which interacts with the extension.
  • a sealing lip ensures tightness in a simple manner.
  • the piston has an enlargement area tapering away from the inlet opening, the largest outer diameter of which rests against an inner wall of the pump chamber and at the end of the delivery stroke has been moved over at least part of the at least one outlet opening or in one Discharge chamber larger diameter enters, which is connected to the outlet opening.
  • the enlargement area can, for example, have the shape of a cone, which in turn is provided with a sealing lip in the area of its largest diameter. When the sealing lip has passed over part of the outlet opening (s), there is a connection between the outlet opening or openings and a low-pressure area on the radial outside of the enlargement area.
  • the low-pressure area can, for example, be connected to the interior of a container in which the medium to be dispensed is present.
  • the enlargement area can also enter a discharge chamber which is connected to the outlet opening or openings.
  • the discharge chamber has a larger diameter than the enlargement area of the piston, so that the circumference of the enlargement area no longer lies against the inner wall of the pump chamber. In this way, too, the outlet opening (s) and the low-pressure area can be connected to one another.
  • the piston is guided in a housing part, a ventilation path being formed between the piston and the housing part.
  • a ventilation path being formed between the piston and the housing part.
  • the housing part forms a valve seat, against which a valve element formed on the piston or connected to the piston rests when the piston is in the non-actuated state.
  • the ventilation section preferably runs through a filter arrangement.
  • the filter arrangement can be formed, for example, by a filter matrix.
  • the filter matrix filters the incoming air for germs and prevents contamination of the system.
  • the filter matrix can also contain biologically active substances that have a germicidal or germ-reducing effect, for example silver.
  • the ventilation section is preferably connected to at least one ventilation opening and the inlet opening is connected to an inlet channel, the at least one ventilation opening being separated from the inlet channel by a partition on its side facing away from the ventilation section.
  • the inlet channel is provided to guide the medium from the container to the inlet opening.
  • the Ventilation opening or openings are provided to allow air to equalize pressure into the container.
  • the partition wall ensures that the air entering does not mix directly with the liquid entering the pump chamber. The liquid entering the pump chamber can thus be kept free of bubbles.
  • the piston preferably has a direction of movement which is directed at an angle in the range from 60 ° to 120 °, in particular at an angle of 90 °, to an output direction of the medium. This results in easy handling. A user can act on a handle that actuates the piston, the direction of action being perpendicular or approximately perpendicular to the direction of discharge.
  • Fig. 1 shows a discharge device 1 which is connected to a container 2.
  • the container 2 can be filled with a liquid medium which is to be dispensed through a dispensing nozzle 3.
  • the medium is not shown for reasons of clarity.
  • the discharge device 1 has a housing 4 which is bounced onto the container 2 or is fastened to the container 2 in some other way.
  • a seal 5 is arranged between the housing 4 and the container 2.
  • a piston 8 is arranged in the pump chamber 7 and can be actuated by a handle 9 against the force of a spring 10. When actuated, the piston 8 is moved into the pump chamber 7 and thereby reduces the volume of the pump chamber 7.
  • the pump chamber 7 has an inlet opening 11 which is in communication with an inlet channel 12.
  • the inlet channel 12 establishes a connection between the container 2 and the inlet opening 11.
  • the pump chamber has at least one outlet opening 13 which opens into an annular space 14 which is connected to an outlet channel 15.
  • the outlet channel 15 in turn leads to a pressure-controlled outlet valve 16.
  • the outlet valve 16 controls the output of the medium through the outlet opening 3. It opens at a predetermined first pressure on its inlet side, ie in the outlet channel 15, and closes at a predetermined second pressure in the outlet channel 15
  • the two pressures can or do not have to be the same.
  • the piston 8 has an extension 17 which enters the inlet opening 11 shortly after the start of a movement in the direction of the inlet opening 11.
  • a movement of the piston 8 from its in Fig. 2 shown inactivated or rest position out is referred to below as the "delivery stroke".
  • the extension 17 of the piston 8 closes the inlet opening 11 shortly after the start of the delivery stroke.
  • the inlet opening 11 is somewhat smaller than the cross section of the extension 17, ie the inlet opening 11 is undersized compared to the cross section of the extension 17.
  • the inlet opening 16 is provided with a sealing lip 18.
  • the piston 8 has an enlargement area 19 which tapers in a direction away from the inlet opening 11.
  • the enlarged area 19 can also be referred to in a simplified manner as a “cone”, although a conical shape is not mandatory.
  • the enlarged area rests with its largest diameter 20 on an inner wall 21 of the pump chamber 7.
  • the largest diameter 20 enters a discharge chamber 22 which has a larger diameter than the pump chamber 7 and which is connected to the outlet opening 13 or the outlet openings.
  • the largest diameter 20 no longer rests on the inner wall of the pump chamber 7, so that there is a connection between the outlet opening 13 and a low-pressure area.
  • the largest diameter 20 at least partially exposes the outlet opening 13, ie the area of enlargement is at least above the outlet opening 13 partially moved away. This also connects the outlet opening 13 to the low-pressure area. The pressure in the outlet channel 15 thus suddenly drops to the pressure in the low-pressure range. The outlet valve 16 closes. Since the closing pressure of the outlet valve 16 and thus the closing time is also determined by the position of the piston 8 in the pump chamber 7, the volume of the medium dispensed through the outlet opening 3 can be metered very precisely.
  • the low-pressure area comprises at least one ventilation opening 23 in the pump chamber housing 6, which is connected to a ventilation channel 24 in the housing 4. There is thus a pressure in the ventilation channel 24 and in the ventilation opening 23 which corresponds to the pressure in the interior of the container 2. This pressure is significantly lower than a pressure prevailing in the pump chamber 7 during the delivery stroke of the piston 8.
  • a ventilation path 25 is provided between the piston 8 and a housing part 26 in which the piston is mounted.
  • the ventilation section 25 is the only connection between the interior of the container 2 and the environment.
  • a filter arrangement 28 surrounds the piston 8.
  • the ventilation path 25 accordingly runs through the filter arrangement 28.
  • the housing part 26 has a valve seat 27 on which a valve element formed on the piston 8 or connected to the piston 8 rests when the piston 8 is not actuated.
  • the valve element is formed by a region of the enlarged diameter 19 facing away from the inlet opening 11. In the non-actuated state of the piston 8, no more air gets into the container 2, so that the risk of contamination of the contents of the container 2 is kept small. Furthermore, the abutment of the enlarged diameter 19 on the valve seat 27 prevents liquid from penetrating out of the container 2.
  • the ventilation opening 23 or the ventilation openings and the inlet channel 12 are separated from one another by a partition 29 on the side of the housing 4 facing the container 2. Air that enters the discharge device 1 through the ventilation path 25 cannot mix with the liquid medium that is present at the inlet channel 12 and will soon be sucked into the pump chamber 7. In this way, bubble-free filling of the pump chamber 7 can be achieved.
  • a locking slide 30 is provided which can be pushed under a lower edge 31 of the handle 9 in order to prevent the handle 9 from being actuated.
  • the blocking of the handle 9 is, however, reversible.
  • the discharge device can furthermore comprise an outer sleeve 32 which holds a head 33 on the housing 4.
  • the discharge device is particularly suitable for an "overhead" output of the medium from the container 2, that is to say for a situation in which the Container 2 is arranged above the carrying device 1 in the direction of gravity.
  • the piston 8 is arranged and movable transversely to an output direction of the medium, i.e. the piston 8 encloses an angle in the range from 60 ° to 120 °, preferably approximately 90 °, with an output device.

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

Description

Die Erfindung betrifft eine Austragvorrichtung zum Austragen von flüssigen Medien aus einem Behälter mit einer Pumpenkammernach dem Oberbegriff des Anspruchs 1.The invention relates to a discharge device for discharging liquid media from a container with a pump chamber according to the preamble of claim 1.

Eine derartige Austragvorrichtung ist beispielsweise aus US 4 944 431 A bekannt.Such a discharge device is, for example, from U.S. 4,944,431 A known.

Eine weitere Austragvorrichtung ist beispielsweise aus DE 28 37 355 A1 bekannt.Another discharge device is, for example, off DE 28 37 355 A1 known.

Eine derartige Austragvorrichtung wird beispielsweise verwendet, um eine Dosis eines Medikaments, das in flüssiger Form vorliegt, auszutragen. Das Medium kann hierzu beispielsweise zerstäubt werden, wie bei einem Nasenspray oder einem Rachenspray.Such a discharge device is used, for example, to discharge a dose of a medicament which is in liquid form. For this purpose, the medium can be atomized, for example, as in the case of a nasal spray or a throat spray.

Zum Austragen des Mediums wird der Kolben, der hierzu in der Regel mit einer Handhabe verbunden ist, in der Pumpenkammer verschoben. Dadurch wird das Volumen der Pumpenkammer verkleinert. In dem Maße, wie das Volumen verkleinert wird, wird das Medium aus der Pumpenkammer durch die Auslassöffnung herausgefördert und letztendlich aus der Vorrichtung ausgegeben. Bei einem Rückhub des Kolbens wird das Volumen der Pumpenkammer wieder vergrößert. Das Medium kann dann durch die Einlassöffnung in die Pumpenkammer einströmen, so dass die Pumpenkammer für den nächsten Betätigungshub des Kolbens wieder gefüllt ist.To discharge the medium, the piston, which is usually connected to a handle for this purpose, is moved in the pump chamber. This reduces the volume of the pump chamber. To the extent that the volume is reduced, the medium is pumped out of the pump chamber through the outlet opening and ultimately discharged from the device. With a return stroke of the piston, the volume of the pump chamber is increased again. The medium can then flow into the pump chamber through the inlet opening, so that the pump chamber is filled again for the next actuation stroke of the piston.

WO 02/094708 A1 zeigt eine Dosierpumpe mit einer Pumpenkammer, die eine Einlassöffnung und eine Auslassöffnung aufweist, und einem Kolben, der in der Pumpenkammer verschiebbar gelagert ist. Der Kolben weist an einem Ende eine Dichtlippenanordnung auf, die in eine Dosierkammer eintritt und die Dosierkammer verschließt. Die Dosierkammer steht mit einem druckgesteuerten Auslassventil in Verbindung. WO 02/094708 A1 shows a metering pump with a pump chamber, which has an inlet opening and an outlet opening, and a piston which is slidably mounted in the pump chamber. At one end, the piston has a sealing lip arrangement which enters a metering chamber and closes the metering chamber. The dosing chamber is connected to a pressure-controlled outlet valve.

Eine ähnliche Ausgestaltung ist aus DE 60 2004 008 340 T2 bekannt. Hier ist eine Dichtlippe an einem Ventilsitz vorgesehen, in dem der Fortsatz des Kolbens eintritt.A similar design is off DE 60 2004 008 340 T2 known. Here a sealing lip is provided on a valve seat in which the extension of the piston enters.

EP 0 738 542 A1 zeigt eine weitere Austragvorrichtung mit einem Kolben, der eine an einer Innenwand eines Zylinders anliegende Dichtlippe aufweist, wobei im Übrigen zwischen dem Kolben und dem Zylinder ein Ringspalt vorgesehen ist, der mit einer Belüftungsöffnung in Verbindung steht. Am Ende eines Förderhubs wird die Dichtlippe teilweise von der Zylinderinnenwand abgehoben, so dass ein Druckausgleich zur Belüftungsöffnung hin erfolgen kann. EP 0 738 542 A1 shows a further discharge device with a piston which has a sealing lip resting against an inner wall of a cylinder, with an annular gap being provided between the piston and the cylinder which is connected to a ventilation opening. At the end of a delivery stroke, the sealing lip is partially lifted off the inner wall of the cylinder so that pressure can be equalized towards the ventilation opening.

Es ist bekannt, die Einlassöffnung in einer Seitenwand der Pumpenkammer anzuordnen. In diesem Fall wird die Einlassöffnung bei einem Kolbenhub in Förderrichtung verschlossen und bei einem Rückhub wieder freigegeben.It is known to arrange the inlet opening in a side wall of the pump chamber. In this case, the inlet opening is closed with a piston stroke in the conveying direction and released again with a return stroke.

In vielen Fällen möchte man mit der Austragvorrichtung eine möglichst genau dosierte Menge des Mediums ausgeben können.In many cases, one would like to be able to dispense an amount of the medium metered as precisely as possible with the discharge device.

Dementsprechend liegt der Erfindung die Aufgabe zugrunde, eine genaue Dosierung einer Ausgabemenge des Mediums zu ermöglichen.Accordingly, the object of the invention is to enable precise metering of an output quantity of the medium.

Diese Aufgabe wird bei einer Austragvorrichtung mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved in a discharge device with the features of claim 1.

Der vorbestimmte Hub des Kolbens kann relativ klein sein. Der Fortsatz tritt dann bereits kurz nach Beginn des Hubs in die Einlassöffnung ein. Wenn der Fortsatz in die Einlassöffnung eintritt, wird die Einlassöffnung unmittelbar verschlossen, so dass kein Medium durch die Einlassöffnung aus der Pumpenkammer herausgefördert werden kann. Der Beginn eines Förderhubes wird damit sehr präzise definiert. Wenn der Beginn eines Förderhubes klar definiert ist, lässt sich die Menge des ausgegebenen Mediums relativ genau dosieren. Ein druckgesteuertes Auslassventil öffnet bei Überschreiten eines ersten vorbestimmten Drucks auf seiner Eingangsseite und schließt bei Unterschreiten eines vorbestimmten Drucks auf seine Eingangsseite. Der erste Druck und der zweite Druck können gleich sein. Sie können aber auch unterschiedlich sein. Wenn der Kolben am Ende des Förderhubs die Auslassöffnung oder die Auslassöffnungen mit einem Niederdruckbereich verbindet, dann bricht der Druck am Eingang des Auslassventils zusammen und das Auslassventil schließt wieder. Somit ist sowohl der Beginn als auch das Ende der Ausgabe des Mediums klar definiert, so dass man eine sehr präzise Dosierung der Menge des Mediums erreichen kann.The predetermined stroke of the piston can be relatively small. The extension then enters the inlet opening shortly after the start of the stroke. When the extension enters the inlet opening, the inlet opening is closed immediately so that no medium can be conveyed out of the pump chamber through the inlet opening. The start of a delivery stroke is thus defined very precisely. If the start of a delivery stroke is clearly defined, the amount of medium dispensed can be dosed relatively precisely. A pressure-controlled outlet valve opens when a first predetermined pressure is exceeded on its input side and closes when it falls below a predetermined pressure on its input side. The first pressure and the second pressure can be the same. But they can also be different. If the piston connects the outlet opening or the outlet openings with a low-pressure area at the end of the delivery stroke, the pressure at the inlet of the outlet valve collapses and the outlet valve closes again. Thus, both the beginning and the end of the dispensing of the medium are clearly defined, so that a very precise metering of the amount of medium can be achieved.

Hierbei ist bevorzugt, dass die Einlassöffnung gegenüber einem Querschnitt des Fortsatzes ein Untermaß aufweist. Die Einlassöffnung muss sich also geringfügig aufweiten, wenn der Fortsatz in sie eintritt. Dies ist aber bei der Verwendung von Kunststoffmaterialien in der Regel problemlos möglich, ohne dass ein Benutzer hier größere Kräfte aufzubringen hätte. Wenn die Einlassöffnung ein Untermaß aufweist, ergibt sich in dem Augenblick, in dem der Fortsatz in die Einlassöffnung eintritt, eine gute Abdichtung, mit der verhindert wird, dass Medium durch die Einlassöffnung aus der Pumpenkammer austreten kann.It is preferred here that the inlet opening is undersized compared to a cross section of the extension. The inlet opening must therefore widen slightly when the extension enters it. When using plastic materials, however, this is generally possible without any problems, without a user having to apply greater forces here. If the inlet opening is undersized, a good seal is obtained at the moment when the extension enters the inlet opening, with which medium is prevented from escaping through the inlet opening from the pump chamber.

Vorzugsweise weist die Einlassöffnung eine Dichtlippe auf, die mit dem Fortsatz zusammenwirkt. Eine Dichtlippe stellt auf einfache Weise eine Dichtigkeit sicher.The inlet opening preferably has a sealing lip which interacts with the extension. A sealing lip ensures tightness in a simple manner.

Hierbei ist bevorzugt, dass der Kolben einen sich in eine Richtung von der Einlassöffnung weg verjüngenden Vergrößerungsbereich aufweist, der mit seinem größten Außendurchmesser an einer Innenwand der Pumpenkammer anliegt und am Ende des Förderhubs zumindest über einen Teil der mindestens einen Auslassöffnung hinwegbewegt worden ist oder in einer Entladungskammer größeren Durchmessers eintritt, die mit der Auslassöffnung verbunden ist. Der Vergrößerungsbereich kann beispielsweise die Form eines Kegels haben, der im Bereich seines größten Durchmessers wiederum mit einer Dichtlippe versehen ist. Wenn die Dichtlippe über einen Teil der Auslassöffnung(en) hinweggestrichen ist, gibt es auf der radialen Außenseite des Vergrößerungsbereichs eine Verbindung zwischen der oder den Auslassöffnungen und einem Niederdruckbereich. Der Niederdruckbereich kann beispielsweise mit dem Inneren eines Behälters verbunden sein, in dem das auszugebende Medium vorhanden ist. Alternativ dazu kann der Vergrößerungsbereich auch in eine Entladungskammer eintreten, die mit der oder den Auslassöffnungen verbunden ist. Die Entladungskammer weist einen größeren Durchmesser auf als der Vergrößerungsbereich des Kolbens, so dass der Umfang des Vergrößerungsbereichs nicht mehr an der Innenwand der Pumpenkammer anliegt. Auch auf diese Weise können die Auslassöffnung(en) und der Niederdruckbereich miteinander verbunden werden.It is preferred here that the piston has an enlargement area tapering away from the inlet opening, the largest outer diameter of which rests against an inner wall of the pump chamber and at the end of the delivery stroke has been moved over at least part of the at least one outlet opening or in one Discharge chamber larger diameter enters, which is connected to the outlet opening. The enlargement area can, for example, have the shape of a cone, which in turn is provided with a sealing lip in the area of its largest diameter. When the sealing lip has passed over part of the outlet opening (s), there is a connection between the outlet opening or openings and a low-pressure area on the radial outside of the enlargement area. The low-pressure area can, for example, be connected to the interior of a container in which the medium to be dispensed is present. As an alternative to this, the enlargement area can also enter a discharge chamber which is connected to the outlet opening or openings. The discharge chamber has a larger diameter than the enlargement area of the piston, so that the circumference of the enlargement area no longer lies against the inner wall of the pump chamber. In this way, too, the outlet opening (s) and the low-pressure area can be connected to one another.

Der Kolben ist in einem Gehäuseteil geführt, wobei eine Belüftungsstrecke zwischen dem Kolben und dem Gehäuseteil ausgebildet ist. Wenn das Medium aus der Pumpenkammer herausgefördert worden ist und ein neues Medium aus dem Behälter in die Pumpenkammer gesaugt wird, entsteht in dem Behälter ein Unterdruck, der ausgeglichen werden muss. Hierzu kann Luft durch die Belüftungsstrecke zwischen dem Kolben und dem Gehäuseteil in den Behälter eintreten. Die Belüftungsstrecke zwischen dem Kolben und dem Gehäuseteil ist im vorliegenden Fall die einzige Belüftungsstrecke. Ansonsten ist die Austragvorrichtung luftdicht ausgebildet. Durch die Verwendung einer einzigen Belüftungsstrecke lässt sich der Luftstrom, der zum Druckausgleich verwendet wird, relativ genau kontrollieren.The piston is guided in a housing part, a ventilation path being formed between the piston and the housing part. When the medium has been pumped out of the pump chamber and a new medium is sucked out of the container into the pump chamber, a negative pressure arises in the container which has to be compensated. For this purpose, air can enter the container through the ventilation path between the piston and the housing part. The ventilation path between the piston and the housing part is the only ventilation path in the present case. Otherwise, the discharge device is designed to be airtight. Through the The use of a single ventilation section allows the air flow that is used to equalize the pressure to be controlled relatively precisely.

Der Gehäuseteil bildet an einem inneren Ende der Belüftungsstrecke einen Ventilsitz, an dem in einem unbetätigten Zustand des Kolbens ein am Kolben ausgebildetes oder mit dem Kolben verbundenes Ventilelement anliegt.At an inner end of the ventilation path, the housing part forms a valve seat, against which a valve element formed on the piston or connected to the piston rests when the piston is in the non-actuated state.

Wenn der Kolben also im unbetätigten Zustand ist, in dem die Pumpenkammer ihr größtes Volumen hat, ist die Belüftungsstrecke verschlossen. Dies hat zwei Auswirkungen. Zum einen kann keine Luft mehr in den Behälter, mit dem die Austragvorrichtung verbunden ist, eintreten. Damit wird das Risiko einer Kontamination des Inhalts des Behälters kleingehalten. Zum anderen ist auch eine Sperre vorhanden, die dagegen sichert, dass Medium aus dem Behälter durch die Austragvorrichtung austritt. Dies ist insbesondere dann von Vorteil, wenn die Austragvorrichtung für eine "über Kopf" Ausgabe vorgesehen ist, bei der sich der Behälter in Schwerkraftrichtung über der Austragvorrichtung befindet.So when the piston is in the non-actuated state, in which the pump chamber has its largest volume, the ventilation path is closed. This has two effects. On the one hand, air can no longer enter the container to which the discharge device is connected. This minimizes the risk of contamination of the contents of the container. On the other hand, there is also a lock which prevents the medium from escaping from the container through the discharge device. This is particularly advantageous when the discharge device is provided for "overhead" discharge, in which the container is located above the discharge device in the direction of gravity.

Vorzugsweise verläuft die Belüftungsstrecke durch eine Filteranordnung hindurch. Die Filteranordnung kann beispielsweise durch eine Filtermatrix gebildet sein. Die Filtermatrix filtert die eintretende Luft hinsichtlich Keimen und verhindert eine Kontamination des Systems. Die Filtermatrix kann auch biologisch aktive Substanzen enthalten, die keimtötend oder keimverringernd wirken, beispielsweise Silber.The ventilation section preferably runs through a filter arrangement. The filter arrangement can be formed, for example, by a filter matrix. The filter matrix filters the incoming air for germs and prevents contamination of the system. The filter matrix can also contain biologically active substances that have a germicidal or germ-reducing effect, for example silver.

Vorzugsweise steht die Belüftungsstrecke mit mindestens einer Belüftungsöffnung in Verbindung und die Einlassöffnung steht mit einem Einlasskanal in Verbindung, wobei die mindestens eine Belüftungsöffnung auf ihrer von der Belüftungsstrecke abgewandten Seite durch eine Trennwand vom Einlasskanal getrennt ist. Der Einlasskanal ist vorgesehen, um das Medium aus dem Behälter zur Einlassöffnung zu leiten. Die Belüftungsöffnung oder die Belüftungsöffnungen sind vorgesehen, um Luft zum Druckausgleich in den Behälter zu lassen. Durch die Trennwand wird sichergestellt, dass sich die eintretende Luft nicht unmittelbar mit der in die Pumpenkammer eintretende Flüssigkeit mischt. Die in die Pumpenkammer eintretende Flüssigkeit kann damit blasenfrei gehalten werden.The ventilation section is preferably connected to at least one ventilation opening and the inlet opening is connected to an inlet channel, the at least one ventilation opening being separated from the inlet channel by a partition on its side facing away from the ventilation section. The inlet channel is provided to guide the medium from the container to the inlet opening. The Ventilation opening or openings are provided to allow air to equalize pressure into the container. The partition wall ensures that the air entering does not mix directly with the liquid entering the pump chamber. The liquid entering the pump chamber can thus be kept free of bubbles.

Vorzugsweise weist der Kolben eine Bewegungsrichtung auf, die unter einem Winkel im Bereich von 60° bis 120°, insbesondere unter einem Winkel von 90° zu einer Ausgaberichtung des Mediums gerichtet ist. Dies ergibt eine einfache Handhabung. Ein Benutzer kann auf eine Handhabe einwirken, die den Kolben betätigt, wobei die Einwirkungsrichtung senkrecht oder annähernd senkrecht zu der Ausgaberichtung gerichtet ist.The piston preferably has a direction of movement which is directed at an angle in the range from 60 ° to 120 °, in particular at an angle of 90 °, to an output direction of the medium. This results in easy handling. A user can act on a handle that actuates the piston, the direction of action being perpendicular or approximately perpendicular to the direction of discharge.

Die Erfindung wird im Folgenden anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung beschrieben. Hierin zeigen:

Fig. 1
eine schematische Schnittansicht einer Austragvorrichtung,
Fig. 2
eine vergrößerte Teilansicht der Austragvorrichtung im unbetätigten Zustand und
Fig. 3
eine vergrößerte Teilansicht der Austragvorrichtung im betätigten Zustand.
The invention is described below using a preferred exemplary embodiment in conjunction with the drawing. Show here:
Fig. 1
a schematic sectional view of a discharge device,
Fig. 2
an enlarged partial view of the discharge device in the non-actuated state and
Fig. 3
an enlarged partial view of the discharge device in the actuated state.

Fig. 1 zeigt eine Austragvorrichtung 1, die mit einem Behälter 2 verbunden ist. Der Behälter 2 kann mit einem flüssigen Medium gefüllt sein, das durch eine Ausgabedüse 3 ausgegeben werden soll. Das Medium ist aus Gründen der Übersicht nicht dargestellt. Fig. 1 shows a discharge device 1 which is connected to a container 2. The container 2 can be filled with a liquid medium which is to be dispensed through a dispensing nozzle 3. The medium is not shown for reasons of clarity.

Die Austragvorrichtung 1 weist ein Gehäuse 4 auf, das auf den Behälter 2 aufgeprellt oder auf andere Weise am Behälter 2 befestigt ist. Zwischen dem Gehäuse 4 und dem Behälter 2 ist eine Dichtung 5 angeordnet.The discharge device 1 has a housing 4 which is bounced onto the container 2 or is fastened to the container 2 in some other way. A seal 5 is arranged between the housing 4 and the container 2.

Im Gehäuse 4 ist ein Pumpengehäuse 6 angeordnet, das eine Pumpenkammer 7 umschließt. In der Pumpenkammer 7 ist ein Kolben 8 angeordnet, der durch eine Handhabe 9 gegen die Kraft einer Feder 10 betätigt werden kann. Bei der Betätigung wird der Kolben 8 in die Pumpenkammer 7 hineinbewegt und verkleinert dadurch das Volumen der Pumpenkammer 7.A pump housing 6, which encloses a pump chamber 7, is arranged in the housing 4. A piston 8 is arranged in the pump chamber 7 and can be actuated by a handle 9 against the force of a spring 10. When actuated, the piston 8 is moved into the pump chamber 7 and thereby reduces the volume of the pump chamber 7.

Die Pumpenkammer 7 weist eine Einlassöffnung 11 auf, die mit einem Einlasskanal 12 in Verbindung steht. Der Einlasskanal 12 stellt eine Verbindung zwischen dem Behälter 2 und der Einlassöffnung 11 her.The pump chamber 7 has an inlet opening 11 which is in communication with an inlet channel 12. The inlet channel 12 establishes a connection between the container 2 and the inlet opening 11.

Ferner weist die Pumpenkammer mindestens eine Auslassöffnung 13 auf, die in einen Ringraum 14 mündet, der mit einem Auslasskanal 15 verbunden ist. Der Auslasskanal 15 wiederum führt zu einem druckgesteuerten Auslassventil 16. Das Auslassventil 16 steuert die Ausgabe des Mediums durch die Auslassöffnung 3. Es öffnet bei einem vorbestimmten ersten Druck auf seiner Eingangsseite, d.h. im Auslasskanal 15, und schließt bei einem vorbestimmten zweiten Druck im Auslasskanal 15. Die beiden Drücke können gleich sein, müssen es aber nicht.Furthermore, the pump chamber has at least one outlet opening 13 which opens into an annular space 14 which is connected to an outlet channel 15. The outlet channel 15 in turn leads to a pressure-controlled outlet valve 16. The outlet valve 16 controls the output of the medium through the outlet opening 3. It opens at a predetermined first pressure on its inlet side, ie in the outlet channel 15, and closes at a predetermined second pressure in the outlet channel 15 The two pressures can or do not have to be the same.

Der Kolben 8 weist einen Fortsatz 17 auf, der kurz nach Beginn einer Bewegung in Richtung auf die Einlassöffnung 11 in die Einlassöffnung 11 eintritt. Eine Bewegung des Kolbens 8 aus seiner in Fig. 2 dargestellten unbetätigten oder Ruhe-Stellung hin heraus wird im Folgenden als "Förderhub" bezeichnet. Der Fortsatz 17 des Kolbens 8 verschließt die Einlassöffnung 11 also kurz nach Beginn des Förderhubs. Zu Beginn des Förderhubs ist allerdings ein Spalt zwischen dem Fortsatz 17 und der Einlassöffnung 11 vorhanden. Die Einlassöffnung 11 ist etwas kleiner als der Querschnitt des Fortsatzes 17, d.h. die Einlassöffnung 11 weist gegenüber dem Querschnitt des Fortsatzes 17 ein Untermaß auf. Hierzu ist die Einlassöffnung 16 mit einer Dichtlippe 18 versehen. Die Dichtlippe 18 legt sich bei einer Bewegung des Fortsatzes 17 in die Eingangsöffnung 11 hinein dichtend an den Fortsatz 17 an. Mit dem Eintritt des Fortsatzes 17 in die Einlassöffnung 11 ergibt sich ein klar definiertes Verschließen der Einlassöffnung 11 und damit ein klar definierter Zeitpunkt, an dem bei einer Weiterbewegung des Kolbens 8 in die Pumpenkammer 7 hinein eine Förderung des in der Pumpenkammer 7 befindlichen Mediums durch die Auslassöffnung 13 hinaus beginnt.The piston 8 has an extension 17 which enters the inlet opening 11 shortly after the start of a movement in the direction of the inlet opening 11. A movement of the piston 8 from its in Fig. 2 shown inactivated or rest position out is referred to below as the "delivery stroke". The extension 17 of the piston 8 closes the inlet opening 11 shortly after the start of the delivery stroke. At the beginning of the delivery stroke, however, there is a gap between the extension 17 and the Inlet opening 11 is present. The inlet opening 11 is somewhat smaller than the cross section of the extension 17, ie the inlet opening 11 is undersized compared to the cross section of the extension 17. For this purpose, the inlet opening 16 is provided with a sealing lip 18. When the extension 17 moves into the inlet opening 11, the sealing lip 18 rests against the extension 17 in a sealing manner. The entry of the extension 17 into the inlet opening 11 results in a clearly defined closure of the inlet opening 11 and thus a clearly defined point in time at which, when the piston 8 moves further into the pump chamber 7, the medium in the pump chamber 7 is conveyed through the Outlet opening 13 also begins.

Da das Medium in der Regel inkompressibel ist, ergibt sich mit dem Beginn der Förderung des Mediums aus der Pumpenkammer 7 hinaus auch der entsprechende Druckanstieg, der zu einer Öffnung des Auslassventils 16 führt.Since the medium is generally incompressible, with the start of the conveyance of the medium out of the pump chamber 7 there is also the corresponding increase in pressure, which leads to an opening of the outlet valve 16.

Der Kolben 8 weist einen Vergrößerungsbereich 19 auf, der sich in eine Richtung weg von der Einlassöffnung 11 verjüngt. Man kann den Vergrößerungsbereich 19 auch vereinfacht als "Kegel" bezeichnen, wenngleich eine konische Form nicht zwingend ist. Der Vergrößerungsbereich liegt mit seinem größten Durchmesser 20 an einer Innenwand 21 der Pumpenkammer 7 an. Am Ende des Förderhubs (Fig. 3) tritt der größte Durchmesser 20 in eine Entladungskammer 22 ein, die einen größeren Durchmesser als die Pumpenkammer 7 aufweist und die mit der Auslassöffnung 13 oder den Auslassöffnungen verbunden ist. In diesem Augenblick liegt der größte Durchmesser 20 nicht mehr an der Innenwand der Pumpenkammer 7 an, so dass sich eine Verbindung zwischen der Auslassöffnung 13 und einem Niederdruckbereich ergibt. Alternativ dazu gibt der größte Durchmesser 20 die Auslassöffnung 13 zumindest teilweise frei, d.h. der Vergrößerungsbereich ist über die Auslassöffnung 13 zumindest teilweise hinwegbewegt worden. Auch dadurch wird die Auslassöffnung 13 mit dem Niederdruckbereich verbunden. Der Druck im Auslasskanal 15 sinkt damit schlagartig auf den Druck im Niederdruckbereich. Das Auslassventil 16 schließt. Da auch der Schließdruck des Auslassventils 16 und damit der Schließzeitpunkt von der Stellung des Kolbens 8 in der Pumpkammer 7 bestimmt ist, lässt sich das durch die Auslassöffnung 3 ausgegebene Volumen des Mediums sehr genau dosieren.The piston 8 has an enlargement area 19 which tapers in a direction away from the inlet opening 11. The enlarged area 19 can also be referred to in a simplified manner as a “cone”, although a conical shape is not mandatory. The enlarged area rests with its largest diameter 20 on an inner wall 21 of the pump chamber 7. At the end of the delivery stroke ( Fig. 3 ) the largest diameter 20 enters a discharge chamber 22 which has a larger diameter than the pump chamber 7 and which is connected to the outlet opening 13 or the outlet openings. At this moment, the largest diameter 20 no longer rests on the inner wall of the pump chamber 7, so that there is a connection between the outlet opening 13 and a low-pressure area. As an alternative to this, the largest diameter 20 at least partially exposes the outlet opening 13, ie the area of enlargement is at least above the outlet opening 13 partially moved away. This also connects the outlet opening 13 to the low-pressure area. The pressure in the outlet channel 15 thus suddenly drops to the pressure in the low-pressure range. The outlet valve 16 closes. Since the closing pressure of the outlet valve 16 and thus the closing time is also determined by the position of the piston 8 in the pump chamber 7, the volume of the medium dispensed through the outlet opening 3 can be metered very precisely.

Der Niederdruckbereich umfasst mindestens eine Belüftungsöffnung 23 im Pumpenkammergehäuse 6, die mit einem Belüftungskanal 24 im Gehäuse 4 in Verbindung steht. Damit herrscht im Belüftungskanal 24 und in der Belüftungsöffnung 23 ein Druck, der dem Druck im Inneren des Behälters 2 entspricht. Dieser Druck ist deutlich niedriger als ein während des Förderhubs des Kolbens 8 in der Pumpenkammer 7 herrschender Druck.The low-pressure area comprises at least one ventilation opening 23 in the pump chamber housing 6, which is connected to a ventilation channel 24 in the housing 4. There is thus a pressure in the ventilation channel 24 and in the ventilation opening 23 which corresponds to the pressure in the interior of the container 2. This pressure is significantly lower than a pressure prevailing in the pump chamber 7 during the delivery stroke of the piston 8.

Wenn der Kolben nach Abschluss eines Förderhubs unter der Wirkung der Feder 10 wieder in seine Ausgangs- oder Ruhestellung zurückbewegt wird, bewegt sich der Fortsatz 17 auch aus der Einlassöffnung 11 heraus. Mit der Rückbewegung des Kolbens 8 entsteht in der Pumpenkammer 7 ein Unterdruck, so dass sich dann, wenn sich zwischen dem Fortsatz 17 und der Dichtlippe 18 wieder ein Spalt ergeben hat, Medium aus dem Behälter 2 durch den Einlasskanal 12 und die Einlassöffnung 11 in die Pumpenkammer 7 gelangen kann. Um dann einen Druckausgleich im Behälter 2 herzustellen, ist eine Belüftungsstrecke 25 zwischen dem Kolben 8 und einem Gehäuseteil 26, in dem der Kolben gelagert ist, vorgesehen. Die Belüftungsstrecke 25 ist die einzige Verbindung zwischen dem Inneren des Behälters 2 und der Umgebung.When the piston is moved back into its starting or rest position after completion of a delivery stroke under the action of the spring 10, the extension 17 also moves out of the inlet opening 11. With the return movement of the piston 8, a negative pressure arises in the pump chamber 7, so that when there is again a gap between the extension 17 and the sealing lip 18, medium flows out of the container 2 through the inlet channel 12 and the inlet opening 11 into the Pump chamber 7 can reach. In order to then produce pressure equalization in the container 2, a ventilation path 25 is provided between the piston 8 and a housing part 26 in which the piston is mounted. The ventilation section 25 is the only connection between the interior of the container 2 and the environment.

Eine Filteranordnung 28 umgibt den Kolben 8. Dementsprechend verläuft die Belüftungsstrecke 25 durch die Filteranordnung 28 hindurch.A filter arrangement 28 surrounds the piston 8. The ventilation path 25 accordingly runs through the filter arrangement 28.

Das Gehäuseteil 26 weist am Ende der Belüftungsstrecke 25, das der Einlassöffnung 11 zugewandt ist, einen Ventilsitz 27 auf, an dem in einem unbetätigten Zustand des Kolbens 8 ein am Kolben 8 ausgebildetes oder mit dem Kolben 8 verbundenes Ventilelement anliegt.At the end of the ventilation path 25 facing the inlet opening 11, the housing part 26 has a valve seat 27 on which a valve element formed on the piston 8 or connected to the piston 8 rests when the piston 8 is not actuated.

Im vorliegenden Fall ist das Ventilelement durch einen von der Einlassöffnung 11 abgewandten Bereich der Durchmesservergrößerung 19 gebildet. Im unbetätigten Zustand des Kolbens 8 gelangt also keine Luft mehr in den Behälter 2, so dass das Risiko einer Kontaminierung des Inhalts des Behälters 2 klein gehalten wird. Weiterhin verhindert die Anlage der Durchmesservergrößerung 19 am Ventilsitz 27, dass Flüssigkeit aus dem Behälter 2 nach außen dringen kann.In the present case, the valve element is formed by a region of the enlarged diameter 19 facing away from the inlet opening 11. In the non-actuated state of the piston 8, no more air gets into the container 2, so that the risk of contamination of the contents of the container 2 is kept small. Furthermore, the abutment of the enlarged diameter 19 on the valve seat 27 prevents liquid from penetrating out of the container 2.

Die Belüftungsöffnung 23 oder die Belüftungsöffnungen und der Einlasskanal 12 sind auf der dem Behälter 2 zugewandten Seite des Gehäuses 4 mit einer Trennwand 29 voneinander getrennt. Luft, die durch die Belüftungsstrecke 25 in die Austragvorrichtung 1 eintritt, kann sich also nicht mit dem flüssigen Medium mischen, das am Einlasskanal 12 ansteht und demnächst in die Pumpenkammer 7 eingesaugt wird. Damit lässt sich eine blasenfreie Füllung der Pumpenkammer 7 erreichen.The ventilation opening 23 or the ventilation openings and the inlet channel 12 are separated from one another by a partition 29 on the side of the housing 4 facing the container 2. Air that enters the discharge device 1 through the ventilation path 25 cannot mix with the liquid medium that is present at the inlet channel 12 and will soon be sucked into the pump chamber 7. In this way, bubble-free filling of the pump chamber 7 can be achieved.

Ein Verschlussschieber 30 ist vorgesehen, der unter eine Unterkante 31 der Handhabe 9 geschoben werden kann, um eine Betätigung der Handhabe 9 zu verhindern. Die Blockierung der Handhabe 9 ist allerdings reversibel.A locking slide 30 is provided which can be pushed under a lower edge 31 of the handle 9 in order to prevent the handle 9 from being actuated. The blocking of the handle 9 is, however, reversible.

Die Austragvorrichtung kann ferner eine Außenhülse 32 umfassen, die einen Kopf 33 am Gehäuse 4 festhält.The discharge device can furthermore comprise an outer sleeve 32 which holds a head 33 on the housing 4.

Die Austragvorrichtung ist insbesondere für eine "über Kopf"-Ausgabe des Mediums aus dem Behälter 2 geeignet, also für eine Situation, in der der Behälter 2 in Schwerkraftrichtung oberhalb der Tragvorrichtung 1 angeordnet ist.The discharge device is particularly suitable for an "overhead" output of the medium from the container 2, that is to say for a situation in which the Container 2 is arranged above the carrying device 1 in the direction of gravity.

Der Kolben 8 ist quer zu einer Ausgaberichtung des Mediums angeordnet und bewegbar, d.h. der Kolben 8 schließt mit einer Ausgabeeinrichtung einen Winkel im Bereich von 60° bis 120° ein, vorzugsweise etwa 90°.The piston 8 is arranged and movable transversely to an output direction of the medium, i.e. the piston 8 encloses an angle in the range from 60 ° to 120 °, preferably approximately 90 °, with an output device.

Claims (7)

  1. A discharge device (1) for discharging liquid media from a tank, comprising a housing (4), a pump chamber housing (6), a pump chamber (7) having an inlet opening (11) and at least one outlet opening (13), and a piston (8) that is displaceable in the pump chamber (7) and has a projection (17) which enters the inlet opening after a predetermined stroke of the piston (8), wherein the at least one outlet opening (13) is connected to a pressure-controlled outlet valve (16), characterized in that at the end of a discharge stroke, the piston (8) connects the outlet opening (13) to a low-pressure region which, in the pump chamber housing (6), has at least one air supply opening (23) which is connected to an air supply channel (24) in the housing (4), and in which a pressure prevails which corresponds to the pressure inside the tank, wherein the piston (8) is guided in a housing section (26), wherein an air supply path (25) is formed between the piston (8) and the housing section (26), and at an inner end of the air supply path, the housing section (26) forms a valve seat (27) against which, in a non-activated state of the piston (8), a valve element rests which is formed on the piston (8) or is connected to the piston (8).
  2. The discharging device according to claim 1, characterized in that the inlet opening (11) is undersized with respect to a cross-section of the projection (17).
  3. The discharging device according to claim 1 or 2, characterized in that the inlet opening (11) has a sealing lip (18) that interacts with the projection (17) .
  4. The discharging device according to any one of claims 1 to 3, characterized in that the piston (8) has an enlargement region (19) which tapers in a direction away from the inlet opening (11) and rests with its largest outer diameter (20) against an inner wall (21) of the pump chamber and which, at the end of the discharge stroke, has been moved past at least a portion of the at least one outlet opening (13) or enters into a discharge chamber (22) of a larger diameter and is connected to the outlet opening (13).
  5. The discharging device according to any one of claims 1 to 4, characterized in that the air supply path (25) passes through a filter arrangement (28).
  6. The discharging device according to any one of claims 1 to 5, characterized in that the air supply path (25) is connected to at least one air supply opening (23) and the inlet opening (11) is connected to an inlet channel (12), wherein the at least one air supply opening (23), on its side facing away from the air supply path (25), is separated from the inlet channel (12) by a partition wall (29).
  7. The discharging device according to any one of claims 1 to 6, characterized in that the piston (8) has a movement direction that is oriented at an angle in the range of 60° to 120° relative to a dispensing direction of the medium.
EP18204255.6A 2018-01-09 2018-11-05 Application device for applying liquid media Active EP3508280B1 (en)

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EP0738542A1 (en) * 1994-10-26 1996-10-23 Yoshino Kogyosho Co., Ltd. Trigger type liquid discharge device

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US10618071B2 (en) 2020-04-14
US20190210049A1 (en) 2019-07-11
ES2867894T3 (en) 2021-10-21
DE102018100338A1 (en) 2019-07-11
EP3508280A1 (en) 2019-07-10

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