EP0289855B1 - Fluid dispenser - Google Patents

Fluid dispenser Download PDF

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Publication number
EP0289855B1
EP0289855B1 EP88106258A EP88106258A EP0289855B1 EP 0289855 B1 EP0289855 B1 EP 0289855B1 EP 88106258 A EP88106258 A EP 88106258A EP 88106258 A EP88106258 A EP 88106258A EP 0289855 B1 EP0289855 B1 EP 0289855B1
Authority
EP
European Patent Office
Prior art keywords
piston
chamber
pump
presuction
valve
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
EP88106258A
Other languages
German (de)
French (fr)
Other versions
EP0289855A3 (en
EP0289855A2 (en
Inventor
Lothar Graf
Karl-Heinz Fuchs
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
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 Ing Erich Pfeiffer GmbH filed Critical Ing Erich Pfeiffer GmbH
Priority to AT88106258T priority Critical patent/ATE77594T1/en
Publication of EP0289855A2 publication Critical patent/EP0289855A2/en
Publication of EP0289855A3 publication Critical patent/EP0289855A3/en
Application granted granted Critical
Publication of EP0289855B1 publication Critical patent/EP0289855B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B05B11/1016—Piston pumps the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element
    • B05B11/1019—Piston pumps the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element the inlet valve moving concurrently with the controlling element during whole pressure and aspiration strokes, e.g. a cage for an inlet valve ball being part of the 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
    • B05B11/0005—Components or details
    • B05B11/0097—Means for filling or refilling the sprayer
    • 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
    • B05B11/1018—Piston pumps the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element and the controlling element cooperating with means for opening or closing the inlet valve

Definitions

  • the invention relates to a discharge device according to the preamble of patent claim 1.
  • the pump chamber can be surrounded by the pre-suction chamber in the form of a separate, cup-shaped chamber body inserted into the cylinder housing. This training has proven itself very well.
  • the invention has for its object to provide a discharge device of the type mentioned, which enables an even more compact and simple design.
  • the pre-suction chamber is at least partially surrounded by the pressure or pump chamber lying within the pump chamber.
  • the pump piston and the pre-suction piston mesh at least over part of their axial extent, so that the piston unit can be made very short.
  • the outer piston can be assigned to the preliminary piston as a piston raceway instead of an inner peripheral surface, so that the preliminary piston is constricted radially inward with increasing pressure in the pressure or pump chamber and thus seals particularly well.
  • the two pistons expediently have piston sleeves lying one inside the other with only a small gap spacing of the order of one to three tenths of a millimeter, so that the pump chamber can be almost completely emptied during each pump stroke and therefore a very precise metering of the amount of medium applied is ensured.
  • the two pistons lying one inside the other can be displaceably mounted to one another for actuating an outlet valve in the direction of the pump stroke, and the pre-suction piston can be actuated of an inlet valve can be composed of two parts which can be displaced relative to one another in the direction of the pump stroke.
  • the inlet valve located directly in the area of the pre-suction piston possibly operating in the manner of a slide control, serves as a transfer valve between the pre-suction chamber and the pressure or pump chamber, so that no separate inlet valve is required between the pre-suction chamber and the accumulator, but only an always open line connection given is.
  • a mechanically opened pressure relief connection is provided to vent the pump chamber in the stroke end position of the piston unit. If this pressure relief connection is formed by the stop-actuated opening of the outlet valve, then there is no need for a separate ventilation channel and the outlet valve can also be designed such that it opens when the pump chamber is filled with media under the pressures occurring during the pump stroke before the stroke end position is reached, so that the outlet valve is opened mechanically below a predetermined pressure and above a certain pressure by pressure difference.
  • the discharge device according to the invention can be designed in a simple manner so that it works equally well practically regardless of position and even in the overhead position when the piston unit is in the initial position, the storage device is prevented from leaking by the discharge device.
  • a discharge device 1 has a cylinder housing 3 which is substantially cylindrical over most of its length and which is to be fastened in a sealed manner to the neck of a vessel 5 provided as a store using a cap 4, for example a screw cap that it only engages in the neck of the vessel with a small gap distance and lies within this neck of the vessel over most of its length.
  • the cylinder housing 3 is provided at its outer or rear end with a ring flange 6 which is formed in one piece with it and projects radially beyond its outer circumference and with which it is clamped against the end face of the neck of the vessel with the interposition of a seal.
  • This outer end of the cylinder housing 3 is essentially closed with a cylinder cover 7, which has a sleeve extension engaging in the cylinder housing and an annular flange part lying in the ring flange 6, which is blown into the inner groove of the ring flange 6 from the outer end face and is thereby secured.
  • the outer end faces of the ring flange 6 and the cylinder cover 7 lie against an annular transverse wall 8 of the cap 4, with which the cylinder cover 7 can thus also be pressed into its sealing fastening position against the ring flange 6.
  • a piston unit 9 is slidably mounted, the two pistons 10 lying coaxially one inside the other, essentially cup-shaped and pointing to the inner end of the cylinder housing 3 with their cup openings, 11 as a working piston, namely an outer pump piston 10 and a pre-suction piston 11 located therein.
  • the inner end of the cylinder housing 3 forms a cylinder 12 with a piston raceway 13 for two annular sealing lips of the pump piston 10 lying one behind the other, which are provided in the region of both ends of this pump piston 10 and are expanded in the opposite shape of a truncated cone to sealing edges.
  • a pre-suction cylinder 15 projecting freely against the piston unit 9, which is formed in one piece with the cylinder housing 3 and protrudes from an annular bottom wall 18 which forms the inner end of the cylinder 12. From the outer end face of this bottom wall 18 there is a connecting piece, which delimits an inlet channel 19, for a riser pipe, for example, reaching as far as the bottom of the vessel 5.
  • the outer circumferential surface of the pre-suction cylinder 15 forms the piston track 16 for the pre-suction piston 11, which engages over the pre-suction cylinder 15 in each piston position in the manner of a slip and is guided on the piston track 16 with an annular sealing lip provided at its front end.
  • a substantially cylindrical piston shaft 21 is provided which is directly connected to the pump piston 10 or is formed in one piece, which passes through the cylinder cover 7 and the transverse wall 8 with a gap distance and an actuating head 22 is placed on its outer, reduced-diameter end is.
  • the tubular piston shaft 21 delimits one with the pump chamber 14 with the interposition of an outlet valve 23 connected outlet channel 24, which leads to an outlet opening 25 in the actuating head 22.
  • the actuating head 22 engages in a position in a collar of the cap 4 projecting from the transverse wall 8.
  • the end of the pre-suction piston 11 opposite the pre-suction chamber 14 is closed with an end wall which forms a frusto-conical valve closing part 26 of the outlet valve 23, the valve seat 27 of which lies in the associated end wall of the pump piston 10 connected to the piston shaft 21 at the inner end of the outlet channel 24 .
  • the pre-suction piston 11 or the valve closing part 26 is guided with an axially slotted shaft 28 in an axially displaceable section of the piston shaft 21 or the outlet channel 24 in such a way that the outlet valve 23 can be opened by shifting against the force of the return spring 20.
  • This section forms a neck 29 of the piston shaft 21, which is thin-walled and elastically compressible under bulging with respect to the remaining sections of the piston shaft lying between the pump piston 10 and the actuating head 22.
  • the valve closing part 26 forms radially outside the valve seat 27 a piston end face which is exposed to the pressure in the pump chamber 14 via the annular gap between the two working pistons and which is larger in area than the front, annular end face 30 of the pre-suction piston 11.
  • a transfer valve 32 is provided, which is opened and closed mechanically depending on the direction of movement of the piston unit 9 or the pre-suction piston 11 and is structurally combined with the pre-suction piston 11 in such a way that both its valve closing part 33 and its valve seat 34 is provided on the pre-suction piston 11.
  • the pre-suction piston 11 has a piston sleeve 35 which is formed by a separate component and is axially limited by a snap connection between an open and a closed position and is movably connected to the piston end wall or the valve closing part 26 of the exhaust valve 23.
  • This piston sleeve 35 which extends almost over the entire length of the corresponding piston sleeve 36 of the pumping piston 10, forms with its rear end face the valve-closing part 33, which is tapered in cross section toward the rear of the pump axis and which, as the valve seat 34, has an annular groove in the front that is complementary in cross section Face of the piston end wall is assigned.
  • piston sleeve 35 On the inner circumference of the piston sleeve 35 are several, radially resiliently distributed over the handling and in one piece from the piston end wall protruding snap members 38 with radially outwardly projecting snap cams which are assigned to an inner ring shoulder of the piston sleeve 35 which is provided as a link and are at a distance from the valve seat 34 such that the piston sleeve 35 axially forwards from the closed position engaging in the valve seat 34 to the stop the cam can be moved into an open position in which the transfer valve 32 in the region of the rear end of the pre-suction piston 11 releases a valve passage 39 between the pre-suction chamber 17 and the annular gap delimited by the piston sleeves 35, 36.
  • valve closing part 33 is pressed against the valve seat 34 due to the friction between the pre-suction piston 11 and the piston race 16, so that the pressure in the pump chamber 14 does not pass through the transfer valve 32 into the pre-suction chamber 17 can escape.
  • the valve closing part is again pulled out of the valve seat 34 as a result of the abovementioned friction, so that medium is sucked through the opened transfer valve 32 from the pre-suction chamber 17 into the pump chamber 14 as a result of the negative pressure building up in the pump chamber 14.
  • the piston shaft 21 forms a driver 40 which is formed in one piece with it and is located opposite the rear end of the shaft 28 and which, when the outlet valve 23 is closed, lies at a short distance from the counter surface of the valve closing part 26 or the shaft 28 formed by the rear end surface. If the pump piston 10 is in its stroke end position lying against the bottom wall 18, the neck 29 no longer lies within the cylinder cover 7, but over most of its length freely within the cylinder housing. If the actuating head 22 is now pressed further, the neck 29 is pressed through Compression widened or shortened, so that the driver 40 runs onto the shaft 28 and takes it along until the end face 30 of the pre-suction piston 11 is also fixed by limit stop on the bottom wall 18 when the transfer valve 32 is closed. In this case, the outlet valve 23 is then opened with a relatively small opening cross section, so that, if necessary, the pump chamber 14 can be effectively vented.
  • the cylinder cover 7 has longitudinal ribs 41 distributed evenly over the circumference, which at the rear ends merge into radial ribs on the outer end face of the annular flange part of the cylinder cover 7, the rib edges of which abut the transverse wall 8.
  • the front ends of the longitudinal ribs 41 are set back relative to the associated end of the sleeve extension of the cylinder cover 7, so that this end, which has a reduced diameter, can form a valve seat of a ventilation valve closed when the piston unit 9 is in its initial position, the valve closing part of which is connected to the piston end wall of the pump piston 10 by a valve , frustoconical portion of the piston skirt 21 is formed.
  • the vessel 5 is aerated via the ventilation valve, for which purpose 3 ventilation openings are provided behind the pump piston 10 in the wall of the cylinder housing, which are essentially covered by the sleeve extension of the cylinder cover 7.
  • the neck 29 Even if it does not have sufficient elasticity for stretching, is inevitably returned to its extended position or to its non-compressed position during the return stroke.
  • FIG. 4 the same reference numerals are used for corresponding parts as in the other figures, but with the index "a”.
  • the cylinder housing 3a is graduated in diameter such that an outer, Over the front wall of the cap 4a freely projecting housing part further and an inner, the cylinder 12a forming part is slimmer, the piston 10a is guided in the further part with its rear sealing lip, which is correspondingly larger in diameter than the front sealing lip guided in the cylinder 12a .
  • the cylinder housing 3a is formed in one piece with the cap 4a, with a sleeve part 42 formed in one piece with the cap 4a protruding from the inside of its end wall, which is tapered at the outer circumference to its end in an approximately conical angle such that instead of a separate seal under sealing pressure engages in the inner circumference of the neck of the vessel.
  • the sleeve part 42 surrounds the cylinder 12a at a distance, such that an annular groove open to the vessel is formed, the bottom surface of which is essentially delimited by an annular shoulder between the further and narrower part of the cylinder housing 3a. In this annular shoulder there are through openings 43 which connect the space behind the front piston lip of the pump piston 10a with the vessel.
  • longitudinal channels 44 are provided which connect to the through openings 43 and end in the initial position of the pump piston 10a in front of its rear piston lip.
  • Each longitudinal channel is formed by at least one longitudinal rib protruding over the inner circumference of the cylinder housing 3a and rising obliquely in the direction of the pump stroke at a flat angle, onto which the rear piston lip runs during the pump stroke and is dented radially inward so that the longitudinal rib passes through on both sides the elastic deformation of this piston lip openings are released.
  • the rear end of the cylinder housing 3a is not closed by a separate cylinder cover, but rather is delimited radially inward from the jacket of the cylinder housing 3a, for example by ultrasound angled jacket straps 7a, which serve as a stop for the pump piston 10a in the starting position.
  • the cylinder housing 3a has an annular collar projecting over its outer circumference at the outer end, over which the cap-shaped actuating head 22a with a corresponding annular collar provided on its inner circumference is fitted by resilient snapping on.
  • the transfer valve 32a is designed as a slide valve lying in the region of the front end of the pre-suction piston 11a, the valve closing part 33a of which is formed by the front piston lip of the pre-suction piston 11a.
  • transition openings 39a in the form of, for example, longitudinal slots, which in the initial position of the piston unit 9a are released by the valve closing part 33a in such a way that they establish a connection between the pre-suction chamber 17a and the pump chamber 14a.
  • the pumping piston 11a has a plunger 45 protruding freely forward and practically forming an extension of the shaft 28a, which strikes the bottom wall of the suction chamber 17a when the suction piston 11a is in the front end position, so that only very small stop forces act on the piston sleeve of the suction piston 11a Act.

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  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Nozzles (AREA)

Abstract

In a dispenser a manually operable thrust piston pump (2) has a presuction piston (11) located with a limited spacing within a pump piston (10) and which in the manner of a telescopic tube engages over a cylindrical, freely projecting chamber body (15) and consequently bounds a presuction chamber (17) constantly connected by a line to a container and whose length and volume are significantly greater than that of a pump chamber (20) surrounding presuction chamber (17). The two working pistons slideably guided on one another form valve closures of an outlet valve (23) controlled by pressure difference and which at the end of the pump travel and in addition to said control, can be mechanically opened by a dog (40) positionally variable by means of a compressible neck (29) for venting the pump chamber (14).

Description

Die Erfindung betrifft eine Austragvorrichtung nach dem Oberbegriff des Patentanspruches 1.The invention relates to a discharge device according to the preamble of patent claim 1.

Bei einer Austragvorrichtung dieser Art kann die Pumpenkammer in Form eines gesonderten, in das Zylindergehäuse eingesetzten, napfförmigen Kammerkörpers von der Vorsaugkammer umgeben sein. Diese Ausbildung hat sich sehr gut bewährt.In the case of a discharge device of this type, the pump chamber can be surrounded by the pre-suction chamber in the form of a separate, cup-shaped chamber body inserted into the cylinder housing. This training has proven itself very well.

Durch die DE-A-2 732 888 ist eine Austragvorrichtung bekanntgeworden die dem Oberbegriff von Anspruch 1 entspricht, bei welcher der Druckraum zwischen den einander zugekehrten Umfangsflächen des inneren und des äußeren Kolbens begrenzt ist, so daß diese Kolben entsprechend dem erforderlichen Druckraumvolumen verhältnismäßig stark unterschiedliche Durchmesser haben müssen, was sich auf die Durchmesser der Austragvorrichtung auswirkt. Ferner schließt der Druckraum axial an einen Ringraum für die Aufnahme des äußeren Kolbens an, was nochmals zu Vergrößerungen der Abmessungen führen kann.From DE-A-2 732 888 a discharge device has become known which corresponds to the preamble of claim 1, in which the pressure space between the facing peripheral surfaces of the inner and outer pistons is limited, so that these pistons are relatively different according to the required pressure space volume Must have diameters, which affects the diameter of the discharge device. Furthermore closes the pressure chamber axially on an annular space for receiving the outer piston, which can lead to further increases in dimensions.

Der Erfindung liegt die Aufgabe zugrunde, eine Austragvorrichtung der genannten Art zu schaffen, welche eine noch kompaktere und einfachere Ausbildung ermöglicht.The invention has for its object to provide a discharge device of the type mentioned, which enables an even more compact and simple design.

Diese Aufgabe wird bei einer Austragvorrichtung der genannten Art gemäß der Erfindung durch den kennzeichnenden Teil des Patentanspruches 1 gelöst. Zweckmäßig ist die Vorsaugkammer wenigstens teilweise innerhalb der Pumpenkammer liegend von der Druck- bzw. Pumpenkammer umgeben. Vorzugsweise ist dabei statt einer axial hintereinanderliegenden Anordnung der beiden Kolben vorgesehen, daß der Pumpkolben und der Vorsaugkolben zumindest auf einem Teil ihrer Axialerstreckung ineinandergreifen, so daß die Kolbeneinheit sehr kurz ausgebildet werden kann.This object is achieved in a discharge device of the type mentioned according to the invention by the characterizing part of patent claim 1. Advantageously, the pre-suction chamber is at least partially surrounded by the pressure or pump chamber lying within the pump chamber. Instead of an axially one-behind arrangement of the two pistons, it is preferably provided that the pump piston and the pre-suction piston mesh at least over part of their axial extent, so that the piston unit can be made very short.

Durch die erfindungsgemäße Ausbildung kann dem Vorsaugkolben als Kolbenlaufbahn statt einer Innenumfangsfläche die Außenumfangsfläche zugeordnet sein, so daß der Vorsaugkolben mit zunehmendem Druck in der Druck- bzw. Pumpenkammer radial nach innen verengend belastet wird und so besonders gut abdichtet.Due to the design according to the invention, the outer piston can be assigned to the preliminary piston as a piston raceway instead of an inner peripheral surface, so that the preliminary piston is constricted radially inward with increasing pressure in the pressure or pump chamber and thus seals particularly well.

Die beiden Kolben weisen zweckmäßig mit nur geringem Spaltabstand in der Größenordnung von ein bis drei Zehntel Millimeter ineinander liegende Kolbenhülsen auf, so daß die Pumpenkammer bei jedem Pumphub nahezu vollständig entleert werden kann und daher eine sehr genaue Dosierung der ausgebrachten Menge an Medium gewährleistet ist.The two pistons expediently have piston sleeves lying one inside the other with only a small gap spacing of the order of one to three tenths of a millimeter, so that the pump chamber can be almost completely emptied during each pump stroke and therefore a very precise metering of the amount of medium applied is ensured.

Die beiden ineinanderliegenden Kolben können zur Betätigung eines Auslaßventiles in Richtung des Pumphubes verschiebbar aneinander gelagert sein und der Vorsaugkolben kann zur Betätigung eines Einlaßventiles aus zwei gegeneinander in Richtung des Pumphubes verschiebbaren Teilen zusammengesetzt sein. Das unmittelbar im Bereich des Vorsaugkolbens liegende, gegebenenfalls nach Art einer Schiebersteuerung arbeitende Einlaßventil dient als Übertritts-Ventil zwischen der Vorsaugkammer und der Druck- bzw. Pumpenkammer, so daß zwischen der Vorsaugkammer und dem Speicher kein gesondertes Einlaßventil erforderlich, sondern lediglich eine stets offene Leitungsverbindung gegeben ist.The two pistons lying one inside the other can be displaceably mounted to one another for actuating an outlet valve in the direction of the pump stroke, and the pre-suction piston can be actuated of an inlet valve can be composed of two parts which can be displaced relative to one another in the direction of the pump stroke. The inlet valve located directly in the area of the pre-suction piston, possibly operating in the manner of a slide control, serves as a transfer valve between the pre-suction chamber and the pressure or pump chamber, so that no separate inlet valve is required between the pre-suction chamber and the accumulator, but only an always open line connection given is.

Um bei noch leeren Kammern eine möglichst schnelle Füllung zu erzielen, ist zur Entlüftung der Pumpenkammer in der Hubendstellung der Kolbeneinheit eine mechanisch geöffnete Druckentlastungs-Verbindung vorgesehen. Ist diese Druckentlastungs-Verbindung durch anschlagbetätigtes Öffnen des Auslaßventiles gebildet, so bedarf es hierzu keines gesonderten Entlüftungskanales und außerdem kann das Auslaßventil so ausgebildet sein, daß es bei mediengefüllter Pumpenkammer unter den beim Pumphub auftretenden Drücken bereits vor Erreichen der Hubendstellung öffnet, so daß das Auslaßventil also unterhalb eines vorbestimmten Druckes mechanisch und oberhalb eines bestimmten Druckes durch Druckdifferenz geöffnet wird.In order to achieve the fastest possible filling when the chambers are still empty, a mechanically opened pressure relief connection is provided to vent the pump chamber in the stroke end position of the piston unit. If this pressure relief connection is formed by the stop-actuated opening of the outlet valve, then there is no need for a separate ventilation channel and the outlet valve can also be designed such that it opens when the pump chamber is filled with media under the pressures occurring during the pump stroke before the stroke end position is reached, so that the outlet valve is opened mechanically below a predetermined pressure and above a certain pressure by pressure difference.

Die erfindungsgemäße Austragvorrichtung kann in einfacher Weise so gestaltet werden, daß sie praktisch lageunabhängig gleich gut arbeitet und selbst in Überkopflage bei Ausgangsstellung der Kolbeneinheit ein Auslaufen des Speichers durch die Austragvorrichtung verhindert ist.The discharge device according to the invention can be designed in a simple manner so that it works equally well practically regardless of position and even in the overhead position when the piston unit is in the initial position, the storage device is prevented from leaking by the discharge device.

Diese und weitere Merkmale von bevorzugten Weiterbildungen der Erfindung gehen 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 können. Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher erläutert. In den Zeichnungen zeigen:

Fig. 1
eine erfindungsgemäße Austragvorrichtung im Axialschnitt und in Ausgangslage,
Fig. 2
einen Ausschnitt der Figur 1 in vergrößerter Darstellung und kurz vor Erreichen der Hubendstellung der Kolbeneinheit,
Fig. 3
einen nochmals vergrößerten Ausschnitt der Figur 1, jedoch am Ende des Rückhubes und
Fig. 4
eine weitere Ausführungsform einer Austragvorrichtung in einer Darstellung entsprechend Figur 1.
These and further features of preferred developments of the invention are also apparent from the description and the drawings, the individual features being able to be implemented individually or in groups in the form of sub-combinations in one embodiment of the invention and in other fields. 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 in axial section and in the starting position,
Fig. 2
2 shows a detail of FIG. 1 in an enlarged representation and shortly before the stroke end position of the piston unit is reached,
Fig. 3
a further enlarged section of Figure 1, but at the end of the return stroke and
Fig. 4
a further embodiment of a discharge device in a representation corresponding to Figure 1.

Wie die Figuren 1 bis 3 zeigen, weist eine erfindungsgemäße Austragvorrichtung 1 ein über den größten Teil seiner Länge im wesentlichen zylindrisches Zylindergehäuse 3 auf, das mit einer beispielsweise als Schraubkappe ausgebildeten Kappe 4 auf dem Hals eines als Speicher vorgesehenen Gefäßes 5 abgedichtet derart zu befestigen ist, daß es in den Gefäßhals nur mit geringem Spaltabstand eingreift und über den größten Teil seiner Länge innerhalb dieses Gefäßhalses liegt. Das Zylindergehäuse 3 ist an seinem äußeren bzw. hinteren Ende mit einem einteilig mit ihm ausgebildeten, radial über seinen Außenumfang vorstehenden Ringflansch 6 versehen, mit dem es unter Zwischenlage einer Dichtung gegen die Stirnseite des Gefäßhalses gespannt ist. Dieses äußere Ende des Zylindergehäuses 3 ist im wesentlichen mit einem Zylinderdeckel 7 verschlossen, der einen in das Zylindergehäuse eingreifenden Hülsenansatz und einen in dem Ringflansch 6 liegenden ringförmigen Flanschteil aufweist, welcher von der äußeren Stirnseite in eine Innennut des Ringflansches 6 eingesprengt und dadurch gesichert ist. Die äußeren Stirnflächen des Ringflansches 6 und des Zylinderdeckels 7 liegen an einer ringförmigen Querwand 8 der Kappe 4 an, mit welcher somit auch der Zylinderdeckel 7 in seine abdichtende Befestigungslage gegen den Ringflansch 6 gepreßt werden kann.As shown in FIGS. 1 to 3, a discharge device 1 according to the invention has a cylinder housing 3 which is substantially cylindrical over most of its length and which is to be fastened in a sealed manner to the neck of a vessel 5 provided as a store using a cap 4, for example a screw cap that it only engages in the neck of the vessel with a small gap distance and lies within this neck of the vessel over most of its length. The cylinder housing 3 is provided at its outer or rear end with a ring flange 6 which is formed in one piece with it and projects radially beyond its outer circumference and with which it is clamped against the end face of the neck of the vessel with the interposition of a seal. This outer end of the cylinder housing 3 is essentially closed with a cylinder cover 7, which has a sleeve extension engaging in the cylinder housing and an annular flange part lying in the ring flange 6, which is blown into the inner groove of the ring flange 6 from the outer end face and is thereby secured. The outer end faces of the ring flange 6 and the cylinder cover 7 lie against an annular transverse wall 8 of the cap 4, with which the cylinder cover 7 can thus also be pressed into its sealing fastening position against the ring flange 6.

In dem Zylindergehäuse 3 ist eine Kolbeneinheit 9 verschiebbar gelagert, die zwei koaxial ineinander liegende, im wesentlichen napfförmige und zum inneren Ende des Zylindergehäuses 3 mit ihren Napföffnungen weisende Kolben 10, 11 als Arbeitskolben, nämlich einen äußeren Pumpkolben 10 und einen in diesem liegenden Vorsaugkolben 11 aufweist. Das innere Ende des Zylindergehäuses 3 bildet einen Zylinder 12 mit einer Kolbenlaufbahn 13 für zwei hintereinander liegende ringförmige Dichtlippen des Pumpkolbens 10, die im Bereich beider Enden dieses Pumpkolbens 10 vorgesehen und entgegengesetzt kegelstumpfförmig bis zu Dichtkanten erweitert sind. Mit Abstand von der Kolbenlaufbahn 13 des Zylinders 12 liegt innerhalb diesem ein frei gegen die Kolbeneinheit 9 vorstehender Vorsaugzylinder 15, der einteilig mit dem Zylindergehäuse 3 ausgebildet ist und von einer ringförmigen Bodenwand 18 absteht, die das innere Ende des Zylinders 12 bildet. Von der äußeren Stirnseite dieser Bodenwand 18 steht ein einen Einlaßkanal 19 begrenzender Anschlußstutzen für ein beispielsweise bis in Bodennähe des Gefäßes 5 reichendes Steigrohr ab. Die Außenumfangsfläche des Vorsaugzylinders 15 bildet die Kolbenlaufbahn 16 für den Vorsaugkolben 11, der den Vorsaugzylinder 15 in jeder Kolbenlage nach Art einer Überstülpung übergreift und an der Kolbenlaufbahn 16 mit einer an seinem vorderen Ende vorgesehenen Ringdichtlippe geführt ist. Der Ringraum zwischen dem Zylinder 12 und dem Vorsaugzylinder 15, in welchem beide Kolben laufen, bildet die Druck- bzw. Pumpenkammer 14, während der vom Vorsaugzylinder 15 und vom Innern des Vorsaugkolbens 11 begrenzte Raum die demgegenüber längere Vorsaugkammer 17 bildet, in welcher eine Rückstellfeder 20 für die Kolbeneinheit 9 in Form einer Schraubendruckfeder liegt.In the cylinder housing 3, a piston unit 9 is slidably mounted, the two pistons 10 lying coaxially one inside the other, essentially cup-shaped and pointing to the inner end of the cylinder housing 3 with their cup openings, 11 as a working piston, namely an outer pump piston 10 and a pre-suction piston 11 located therein. The inner end of the cylinder housing 3 forms a cylinder 12 with a piston raceway 13 for two annular sealing lips of the pump piston 10 lying one behind the other, which are provided in the region of both ends of this pump piston 10 and are expanded in the opposite shape of a truncated cone to sealing edges. At a distance from the piston raceway 13 of the cylinder 12 there is a pre-suction cylinder 15 projecting freely against the piston unit 9, which is formed in one piece with the cylinder housing 3 and protrudes from an annular bottom wall 18 which forms the inner end of the cylinder 12. From the outer end face of this bottom wall 18 there is a connecting piece, which delimits an inlet channel 19, for a riser pipe, for example, reaching as far as the bottom of the vessel 5. The outer circumferential surface of the pre-suction cylinder 15 forms the piston track 16 for the pre-suction piston 11, which engages over the pre-suction cylinder 15 in each piston position in the manner of a slip and is guided on the piston track 16 with an annular sealing lip provided at its front end. The annular space between the cylinder 12 and the pre-suction cylinder 15, in which both pistons run, forms the pressure or pump chamber 14, while the space delimited by the pre-suction cylinder 15 and from the inside of the pre-suction piston 11 forms the longer suction chamber 17, in which a return spring 20 for the piston unit 9 is in the form of a helical compression spring.

Am hinteren Ende der Kolbeneinheit 9 ist ein unmittelbar mit dem Pumpkolben 10 verbundener bzw. einteilig ausgebildeter, im wesentlichen zylindrischer Kolbenschaft 21 vorgesehen, der den Zylinderdeckel 7 sowie die Querwand 8 mit Spaltabstand durchsetzt und auf dessen äußeres, im Durchmesser reduziertes Ende ein Betätigungskopf 22 aufgesetzt ist. Der rohrförmige Kolbenschaft 21 begrenzt einen mit der Pumpenkammer 14 unter Zwischenschaltung eines Auslaßventiles 23 verbundenen Auslaßkanal 24, der zu einer Auslaßöffnung 25 im Betätigungskopf 22 führt. Der Betätigungskopf 22 greift in jeder Stellung in einen von der Querwand 8 abstehenden Kragen der Kappe 4 ein.At the rear end of the piston unit 9, a substantially cylindrical piston shaft 21 is provided which is directly connected to the pump piston 10 or is formed in one piece, which passes through the cylinder cover 7 and the transverse wall 8 with a gap distance and an actuating head 22 is placed on its outer, reduced-diameter end is. The tubular piston shaft 21 delimits one with the pump chamber 14 with the interposition of an outlet valve 23 connected outlet channel 24, which leads to an outlet opening 25 in the actuating head 22. The actuating head 22 engages in a position in a collar of the cap 4 projecting from the transverse wall 8.

Das der Vorsaugkammer 14 gegenüberliegende Ende des Vorsaugkolbens 11 ist mit einer Stirnwand geschlossen, die einen kegelstumpfförmigen Ventilschließteil 26 des Auslaßventiles 23 bildet, dessen Ventilsitz 27 in der zuge- hörigen, mit dem Kolbenschaft 21 verbundenen Stirnwand des Pumpkolbens 10 am inneren Ende des Auslaßkanales 24 liegt. Der Vorsaugkolben 11 bzw. der Ventilschließteil 26 ist mit einem axial geschlitzten Schaft 28 in einem im Innendurchmesser erweiterten Abschnitt des Kolbenschaftes 21 bzw. des Auslaßkanales 24 axial verschiebbar derart geführt, daß durch Verschieben entgegen der Kraft der Rückstellfeder 20 das Auslaßventil 23 geöffnet werden kann. Dieser Abschnitt bildet einen Hals 29 des Kolbenschaftes 21, der gegenüber den übrigen, zwischen dem Pumpkolben 10 und dem Betätigungskopf 22 liegenden Abschnitten des Kolbenschaftes dünnwandiger und unter bauchiger Aufweitung elastisch stauchbar ist. Der Ventilschließteil 26 bildet radial außerhalb des Ventilsitzes 27 eine über den Ringspalt zwischen den beiden Arbeitskolben dem Druck in der Pumpenkammer 14 ausgesetzte Kolbenstirnfläche, die flächengrößer als die vordere, ringförmige Stirnfläche 30 des Vorsaugkolbens 11 ist. Beim Betätigen der Austragvorrichtung 1 durch Niederdrücken des Betätigungskopfes 22 entgegen der Kraft der Rückstellfeder 20 werden die vorderen Dichtlippen der beiden Arbeitskolben unter dem sich aufbauenden Druck dicht gegen die Kolbenlaufbahnen 13, 16 gepreßt und bei Erreichen eines vorbestimmten Druckes wird das Auslaßventil 23 entgegen der Kraft der auch dieses Auslaßventil 23 zur Schließstellung belastenden Rückstellfeder 20 durch den Differenzdruck geöffnet, wobei sich der Vorsaugkolben 11 gegenüber dem Pumpkolben 10 nach vorne derart verschiebt, daß beispielsweise die vordere Stirnfläche 30 des Vorsaugkolbens 11 der vorderen Stirnfläche 31 des Pumpkolbens 10 gemäß Figur 2 vorauseilt. Schlägt nunmehr die vordere Stirnfläche 30 des Vorsaugkolbens 11 an der Bodenwand 18 an und wird die Kolbeneinheit 9 noch weiter vorgeschoben, so wird der Pumpkolben 10 bzw. der Ventilsitz 27 gegenüber dem Vorsaugkolben 11 wieder in Richtung Schließlage des Auslaßventiles 23 bewegt, so daß der Durchlaßquerschnitt des Auslaßventiles 23 wesentlich verengt wird. Da die vordere Stirnfläche 30 in der Schließlage des Auslaßventiles 23 gegenüber der vorderen Stirnfläche 31 geringfügig zurücksteht, wird hierbei das Auslaßventil 23 noch nicht ganz geschlossen, sondern dies erfolgt nach entsprechendem Druckabbau erst durch die Rückstellfeder 20.The end of the pre-suction piston 11 opposite the pre-suction chamber 14 is closed with an end wall which forms a frusto-conical valve closing part 26 of the outlet valve 23, the valve seat 27 of which lies in the associated end wall of the pump piston 10 connected to the piston shaft 21 at the inner end of the outlet channel 24 . The pre-suction piston 11 or the valve closing part 26 is guided with an axially slotted shaft 28 in an axially displaceable section of the piston shaft 21 or the outlet channel 24 in such a way that the outlet valve 23 can be opened by shifting against the force of the return spring 20. This section forms a neck 29 of the piston shaft 21, which is thin-walled and elastically compressible under bulging with respect to the remaining sections of the piston shaft lying between the pump piston 10 and the actuating head 22. The valve closing part 26 forms radially outside the valve seat 27 a piston end face which is exposed to the pressure in the pump chamber 14 via the annular gap between the two working pistons and which is larger in area than the front, annular end face 30 of the pre-suction piston 11. When the discharge device 1 is actuated by depressing the actuating head 22 against the force of the return spring 20, the front sealing lips of the two working pistons are pressed tightly against the piston raceways 13, 16 under the pressure which builds up, and when a predetermined pressure is reached, the outlet valve 23 is pressed against the force of the this outlet valve 23 to the closing position loading return spring 20 is opened by the differential pressure, the pre-suction piston 11 being displaced forward relative to the pump piston 10 such that, for example the front end face 30 of the pre-suction piston 11 leads the front end face 31 of the pump piston 10 according to FIG. 2. If the front end face 30 of the suction piston 11 strikes against the bottom wall 18 and the piston unit 9 is advanced even further, the pump piston 10 or the valve seat 27 is moved relative to the suction piston 11 again in the direction of the closed position of the exhaust valve 23, so that the passage cross section of the exhaust valve 23 is significantly narrowed. Since the front end face 30 is slightly behind in the closed position of the outlet valve 23 relative to the front end face 31, the outlet valve 23 is not yet completely closed, but instead takes place only after the corresponding pressure reduction by the return spring 20.

Zur Füllung der Pumpenkammer 14 aus der Vorsaugkammer 17 ist ein Übertritt-Ventil 32 vorgesehen, das mechanisch in Abhängigkeit von der Bewegungsrichtung der Kolbeneinheit 9 bzw. des Vorsaugkolbens 11 geöffnet und geschlossen wird und baulich mit dem Vorsaugkolben 11 derart vereint ist, daß sowohl sein Ventilschließteil 33 als auch sein Ventilsitz 34 am Vorsaugkolben 11 vorgesehen ist. Zu diesem Zweck weist der Vorsaugkolben 11 eine durch einen gesonderten Bauteil gebildete Kolbenhülse 35 auf, die über eine Schnappverbindung axial begrenzt zwischen einer Öffnungs-und einer Schließstellung beweglich mit der Kolbenstirnwand bzw. dem Ventilschließteil 26 des Auslaßventiles 23 verbunden ist. Diese Kolbenhülse 35, die nahezu über die gesamte Länge der entsprechenden Kolbenhülse 36 des Pumpkolbens 10 reicht, bildet mit ihrer hinteren Stirnseite den um die Pumpenachse rinförmigen, im Querschnitt nach hinten verjüngten Ventilschließteil 33, dem als Ventilsitz 34 eine im Querschnitt komplementäre Ringnut in der vorderen Stirnfläche der Kolbenstirnwand zugeordnet ist. Am Innenumfang der Kolbenhülse 35 liegen mehrere gleichmäßig über den Umgang verteilte, radial federnde und einteilig von der Kolbenstirnwand abstehende Schnappglieder 38 mit radial nach außen vorstehenden Schnappnocken, die einer als Gegeglied vorgesehenen Innenringschulter der Kolbenhülse 35 zugeordnet sind und so im Abstand vom Ventilsitz 34 liegen, daß die Kolbenhülse 35 aus der in den Ventilsitz 34 dicht eingreifenden Schließlage axial nach vorne bis zum Anschlag an den Nocken in eine Öffnungslage bewegt werden kann, in welcher das Übertrittsventil 32 im bereich des hinteren Endes des Vorsaugkolbens 11 einen Ventildurchlaß 39 zwischen der Vorsaugkammer 17 und dem von den Kolbenhülsen 35, 36 begrenzten Ringspalt freigibt.To fill the pump chamber 14 from the pre-suction chamber 17, a transfer valve 32 is provided, which is opened and closed mechanically depending on the direction of movement of the piston unit 9 or the pre-suction piston 11 and is structurally combined with the pre-suction piston 11 in such a way that both its valve closing part 33 and its valve seat 34 is provided on the pre-suction piston 11. For this purpose, the pre-suction piston 11 has a piston sleeve 35 which is formed by a separate component and is axially limited by a snap connection between an open and a closed position and is movably connected to the piston end wall or the valve closing part 26 of the exhaust valve 23. This piston sleeve 35, which extends almost over the entire length of the corresponding piston sleeve 36 of the pumping piston 10, forms with its rear end face the valve-closing part 33, which is tapered in cross section toward the rear of the pump axis and which, as the valve seat 34, has an annular groove in the front that is complementary in cross section Face of the piston end wall is assigned. On the inner circumference of the piston sleeve 35 are several, radially resiliently distributed over the handling and in one piece from the piston end wall protruding snap members 38 with radially outwardly projecting snap cams which are assigned to an inner ring shoulder of the piston sleeve 35 which is provided as a link and are at a distance from the valve seat 34 such that the piston sleeve 35 axially forwards from the closed position engaging in the valve seat 34 to the stop the cam can be moved into an open position in which the transfer valve 32 in the region of the rear end of the pre-suction piston 11 releases a valve passage 39 between the pre-suction chamber 17 and the annular gap delimited by the piston sleeves 35, 36.

Wird die Kolbeneinheit 9 aus der Ausgangslage in Richtung des Pumphubes bewegt, so wird der Ventilschließteil 33 infolge der Reibung zwischen Vorsaugkolben 11 und Kolbenlaufbahn 16 schließend gegen den Ventilsitz 34 gedrückt, so daß der Druck in der Pumpenkammer 14 nicht durch das Übertrittsventil 32 in die Vorsaugkammer 17 entweichen kann. Bei der Rückhubbewegung wird der Ventilschließteil wiederum infolge der genannten Reibung bis zum Anschlag aus dem Ventilsitz 34 herausgezogen, so daß infolge des sich in der Pumpenkammer 14 aufbauenden Unterdruckes Medium durch das geöffnete Übertrittsventil 32 aus der Vorsaugkammer 17 in die Pumpenkammer 14 gesaugt wird.If the piston unit 9 is moved from the initial position in the direction of the pump stroke, the valve closing part 33 is pressed against the valve seat 34 due to the friction between the pre-suction piston 11 and the piston race 16, so that the pressure in the pump chamber 14 does not pass through the transfer valve 32 into the pre-suction chamber 17 can escape. During the return stroke movement, the valve closing part is again pulled out of the valve seat 34 as a result of the abovementioned friction, so that medium is sucked through the opened transfer valve 32 from the pre-suction chamber 17 into the pump chamber 14 as a result of the negative pressure building up in the pump chamber 14.

Der Kolbenschaft 21 bildet einen einteilig mit ihm ausgebildeten und dem hinteren Ende des Schaftes 28 gegenüberliegenden Mitnehmer 40, welcher bei geschlossenem Auslaßventil 23 in geringem Abstand von der durch die hintere Endfläche gebildeten Gegenfläche des Ventilschließteiles 26 bzw. des Schaftes 28 liegt. Befindet sich der Pumkolben 10 in seiner an der Bodenwand 18 anliegenden Hubendstellung, so liegt der Hals 29 nicht mehr gefasst innerhalb des Zylinderdeckels 7, sondern über den größten Teil seiner Länge frei innerhalb des Zylindergehäuses. Wird der Betatigungskopf 22 nunmehr weitergedrückt, so wird der Hals 29 durch Stauchung aufgeweitet bzw. verkürzt, so daß der Mitnehmer 40 auf den Schaft 28 aufläuft und diesen mitnimmt, bis bei geschlossenem Übertrittsventil 32 die Stirnfläch 30 des Vorsaugkolbens 11 ebenfalls durch Anschlagbegrenzung an der Bodenwand 18 festgelegt wird. Hierbei ist dann das Auslaßventil 23 mit relativ geringem Öffnungsquerschnitt geöffnet, so daß gegebenenfalls eine wirksame Entlüftung der Pumpenkammr 14 erfolgen kann.The piston shaft 21 forms a driver 40 which is formed in one piece with it and is located opposite the rear end of the shaft 28 and which, when the outlet valve 23 is closed, lies at a short distance from the counter surface of the valve closing part 26 or the shaft 28 formed by the rear end surface. If the pump piston 10 is in its stroke end position lying against the bottom wall 18, the neck 29 no longer lies within the cylinder cover 7, but over most of its length freely within the cylinder housing. If the actuating head 22 is now pressed further, the neck 29 is pressed through Compression widened or shortened, so that the driver 40 runs onto the shaft 28 and takes it along until the end face 30 of the pre-suction piston 11 is also fixed by limit stop on the bottom wall 18 when the transfer valve 32 is closed. In this case, the outlet valve 23 is then opened with a relatively small opening cross section, so that, if necessary, the pump chamber 14 can be effectively vented.

Der Zylinderdeckel 7 weist zur Führung des Außenumfangs des Halses 29 gleichmäßig über den Umfang verteilte Längsrippen 41 auf, die an hinteren Enden in Radialrippen an der äußeren Stirnseite des ringförmigen Flanschteiles des Zylinderdeckels 7 übergehen, welche mit ihren Rippenkanten an der Querwand 8 anliegen. Die vorderen Enden der Längsrippen 41 sind gegenüber dem zugehörigen Ende des Hülsenansatzes des Zylinderdeckels 7 zurückversetzt, so daß dieses, im Durchmesser reduzierte Ende einen Ventilsitz eines bei Ausgangslage der Kolbeneinheit 9 geschlossenen belüftungsventiles bilden kann, dessen Ventilschließteil durch einen an die Kolbenstirnwand des Pumpkolbens 10 anschließenden, kegelstumpfförmigen Abschnitt des Kolbenschaftes 21 gebildet ist. Über das Belüftungsventil wird das Gefäß 5 belüftet, wofür hinter dem Pumpkolben 10 in der Wandung des Zylindergehäuses 3 Belüftungsöffnungen vorgesehen sind, die im wesentlichen durch den Hülsenansatz des Zylinderdeckels 7 überdeckt sind. Durch die Längsrippen 41 wird der Hals 29 selbst dann, wenn er für eine Streckung nicht die ausreichende Elastizität aufweist, beim Rückhub zwangsläufig wieder in seine Strecklage bzw. in seine nicht gestauchte Lage zurückgeführt.For guiding the outer circumference of the neck 29, the cylinder cover 7 has longitudinal ribs 41 distributed evenly over the circumference, which at the rear ends merge into radial ribs on the outer end face of the annular flange part of the cylinder cover 7, the rib edges of which abut the transverse wall 8. The front ends of the longitudinal ribs 41 are set back relative to the associated end of the sleeve extension of the cylinder cover 7, so that this end, which has a reduced diameter, can form a valve seat of a ventilation valve closed when the piston unit 9 is in its initial position, the valve closing part of which is connected to the piston end wall of the pump piston 10 by a valve , frustoconical portion of the piston skirt 21 is formed. The vessel 5 is aerated via the ventilation valve, for which purpose 3 ventilation openings are provided behind the pump piston 10 in the wall of the cylinder housing, which are essentially covered by the sleeve extension of the cylinder cover 7. Through the longitudinal ribs 41, the neck 29, even if it does not have sufficient elasticity for stretching, is inevitably returned to its extended position or to its non-compressed position during the return stroke.

In Figur 4 sind für einander entsprechende Teile die gleichen Bezugszeichen wie in den übrigen Figuren, jedoch mit dem Index "a" verwendet. Das Zylindergehäuse 3a ist im Durchmesser derart abgestuft ausgebildet, daß ein äußerer, über die Stirnwand der Kappe 4a frei vorstehender Gehäuseteil weiter und ein innerer, den Zylinder 12a bildender Teil schlanker ist, wobei der Kolben 10a im weiteren Teil mit seiner hinteren Dichtlippe geführt ist, die im Durchmesser entsprechend größer als die vordere, im Zylinder12a geführte Dichtlippe ist. Das Zylindergehäuse 3a ist einteilig mit der Kappe 4a ausgebildet, wobei über die Innenseite von deren Stirnwand ein einteilig mit der Kappe 4a ausgebildeter Muffenteil 42 vorsteht, der am Außenumfang zu seinem Ende derart anähernd spitzwinklig konisch verjüngt ist, daß er statt einer gesonderten Dichtung unter Dichtpressung in den Innenumfang des Gefäßhalses eingreift. Der Muffenteil 42 umgibt den Zylinder 12a mit Abstand, derart, daß eine zum Gefäß offene Ringnut gebildet ist, deren Bodenfläche im wesentlichen durch eine Ringschulter zwischen dem weiteren und engeren Teil des Zylindergehäuses 3a begrenzt ist. In dieser Ringschulter liegen Durchgangsöffnungen 43, welche den Raum hinter der vorderen Kolbenlippe des Pumpkolbens 10a mit dem Gefäß verbinden. Am Innenumfang des weiteren Abschnittes des Zylindergehäuses 3a sind Längskanäle 44 vorgesehen, die an die Durchgangsöffnungen 43 anschließen und bei Ausgangslage des Pumpkolbens 10a vor dessen hinterer Kolbenlippe enden. Jeder Längskanal ist durch mindestens eine über den Innenumfang des Zylindergehäuses 3a vorstehende, in Richtung des Pumphubes unter einem flachen Winkel schräg ansteigende Längsrippe gebildet, auf welche die hintere Kolbenlippe während des Pumphubes aufläuft und dabei so radial nach innen eingedellt wird, daß beiderseits der Längsrippe durch die elastische Verformung dieser Kolbenlippe Öffnungen freigegeben werden. Das hintere Ende des Zylindesrgehäuses 3a ist nicht durch einen gesonderten Zylinderdeckel verschlossen, sondern durch aus dem Mantel des Zylindergehäuses 3a radial nach innen beispielsweise durch Ultraschall abgewinkelte Mantellaschen 7a begrenzt, welche als Anschlag für den Pumpkolben 10a in der Ausgangsstellung dienen. Es können mehrere, z.B. drei gleichmäßig über den Umfang verteilte Matellaschen 7a vorgesehen sein, wobei in diesem Fall der Betätigungskopf 22a zweckmäßig das Zylindergehäuse 3a am Außenumfabng übergreift und in seiner Ausgangsstellung ebenfalls durch Anschlag gegenüber dem Zylindergehäuse 3a gesichert ist. Zu diesem Zweck weist das Zylindergehäuse 3a am äußeren Ende einen über seinen Außenumfang vostehenden Ringbund auf, über welchen der kappenförmige Betätigungskopf 22a mit einem entsprechenden, an seinem Innenumfang vorgesehenen Ringbund durch federndes Aufschnappen aufgesetzt ist.In FIG. 4, the same reference numerals are used for corresponding parts as in the other figures, but with the index "a". The cylinder housing 3a is graduated in diameter such that an outer, Over the front wall of the cap 4a freely projecting housing part further and an inner, the cylinder 12a forming part is slimmer, the piston 10a is guided in the further part with its rear sealing lip, which is correspondingly larger in diameter than the front sealing lip guided in the cylinder 12a . The cylinder housing 3a is formed in one piece with the cap 4a, with a sleeve part 42 formed in one piece with the cap 4a protruding from the inside of its end wall, which is tapered at the outer circumference to its end in an approximately conical angle such that instead of a separate seal under sealing pressure engages in the inner circumference of the neck of the vessel. The sleeve part 42 surrounds the cylinder 12a at a distance, such that an annular groove open to the vessel is formed, the bottom surface of which is essentially delimited by an annular shoulder between the further and narrower part of the cylinder housing 3a. In this annular shoulder there are through openings 43 which connect the space behind the front piston lip of the pump piston 10a with the vessel. On the inner circumference of the further section of the cylinder housing 3a, longitudinal channels 44 are provided which connect to the through openings 43 and end in the initial position of the pump piston 10a in front of its rear piston lip. Each longitudinal channel is formed by at least one longitudinal rib protruding over the inner circumference of the cylinder housing 3a and rising obliquely in the direction of the pump stroke at a flat angle, onto which the rear piston lip runs during the pump stroke and is dented radially inward so that the longitudinal rib passes through on both sides the elastic deformation of this piston lip openings are released. The rear end of the cylinder housing 3a is not closed by a separate cylinder cover, but rather is delimited radially inward from the jacket of the cylinder housing 3a, for example by ultrasound angled jacket straps 7a, which serve as a stop for the pump piston 10a in the starting position. There can be several, for example three evenly distributed over the circumference mat tabs 7a are provided, in which case the actuating head 22a expediently engages over the cylinder housing 3a on the outer circumference and is also secured in its starting position by a stop relative to the cylinder housing 3a. For this purpose, the cylinder housing 3a has an annular collar projecting over its outer circumference at the outer end, over which the cap-shaped actuating head 22a with a corresponding annular collar provided on its inner circumference is fitted by resilient snapping on.

Das Übertrittsventil 32 a ist in diesem Fall als im Bereich des vorderen Endes des Vorsaugkolbens 11a liegendes Schieberventil ausgebildet, dessen Ventilschließteil 33a durch die vordere Kolbenlippe des Vorsaugkolbens 11a gebildet ist. Am freien Ende des Vorsaugzylinders 15a sind Übertrittsöffnungen 39a in Form beispielsweise von Längsschlitzen vorgesehen, welche in der Ausgangsstellung der Kolbeneinheit 9a von dem Ventilschließteil 33a derart freigegeben sind, daß sie eine Verbindung zwischen der Vorsaugkammer 17a und der Pumpenkammer 14a herstellen. Sobald der Vorsaugkolben 11a in Richtung des Pumphubes über eine erste kleine Wegstrecke bewegt ist, sind diese Übertrittsöffnungen 39a geschlossen.In this case, the transfer valve 32a is designed as a slide valve lying in the region of the front end of the pre-suction piston 11a, the valve closing part 33a of which is formed by the front piston lip of the pre-suction piston 11a. At the free end of the pre-suction cylinder 15a there are transition openings 39a in the form of, for example, longitudinal slots, which in the initial position of the piston unit 9a are released by the valve closing part 33a in such a way that they establish a connection between the pre-suction chamber 17a and the pump chamber 14a. As soon as the pre-suction piston 11a is moved in the direction of the pump stroke over a first small distance, these transfer openings 39a are closed.

Der Pumpkolben 11a weist im Innern einen frei nach vorne vorstehenden, praktisch eine Verlängerung des Schaftes 28a bildenden Stößel 45 auf, der bei vorderer Endstellung des Vorsaugkolbens 11a an der Bodenwand der Vorsaugkammer 17a anschlägt, so daß auf die Kolbenhülse des Vorsaugkolbens 11a nur sehr geringe Anschlagkräfte wirken.The pumping piston 11a has a plunger 45 protruding freely forward and practically forming an extension of the shaft 28a, which strikes the bottom wall of the suction chamber 17a when the suction piston 11a is in the front end position, so that only very small stop forces act on the piston sleeve of the suction piston 11a Act.

Claims (10)

  1. Discharging apparatus for media, particularly liquids, with a pump (2) manually operable by means of a pump stroke or a return stroke, for which a presuction device with an internal presuction chamber (17) is provided and whose pump chamber (14) for filling from a reservoir is connectable to an inlet and for discharge purposes is connected to an outlet tube (24) leading to an outlet port (25), in which an inner piston (11) and an outer piston (10) over at least part of their length engage over one another and form boundaries of a cross-sectionally circular pressure chamber (14), which is inwardly bounded by an outer circumferential surface (16), characterized in that the inner piston (11) can be slid along the outer circumferential surface (16) of the presuction cylinder (15) and the outer piston (10) in at least one position extends into the circular pressure chamber (14).
  2. Discharging apparatus according to claim 1, characterized in that the pump constructed as a thrust piston pump (2) has a cylinder block (3) with a pump piston (10) of a piston unit (9) movable in a cylinder (12) along a cylinder path (13) over a pump travel from a starting position (fig. 1) into a travel end position, the piston unit (9) bounding in the cylinder (12) the pump chamber (14) and on the intake side a presuction piston (11) is connected upstream of the presuction chamber (17) and can be connected via an overflow (32) to said pump chamber (14) and during the pump travel is closed with respect to the pump chamber (14) and in which preferably the presuction chamber (17) is located at least partly within the pump chamber (14) and forming the outer circumferential surface (16) is surrounded by the pump chamber forming the pressure chamber (14) or the pump piston (10) and the presuction piston (11) form the at least partly interengaging inner and outer pistons (11,10).
  3. Discharging apparatus according to claims 1 or 2, characterized in that a chamber body (15) forming the outer circumferential surface (16) is placed substantially equiaxially in the pressure chamber (14) and in particular the inner piston (11) is guided on a piston path formed by the outer circumferential surface of the chamber body (15) and that preferably the inner piston (11) has a roughly cylindrical piston sleeve (35), which is placed as a separate component and with a spacing within the piston sleeve (36) of the outer piston (10) and that piston sealing lips provided on the outer circumference of the outer piston (10) and on the inner circumference of the inner piston (11) are provided in substantially the same length zone of the cylinder block (3).
  4. Discharging apparatus according to one of the preceding claims, characterized in that for operating an outlet valve (23), the inner piston (11) is displaceably mounted opposite to or on the outer piston (10) and in particular on the rear end of the piston sleeve (35) forms a larger piston end face than at the front end, that preferably the rear end of the inner piston (11) is closed with an end wall, which in particular on the outer circumference forms an approximately frustum-shaped valve closing part (26) of the outlet valve (23), with which is associated as a valve seat (27) an inner shoulder at the rear end of the outer piston (10) and that preferably the inner piston (11) with a shaft (28) provided on its rear end is guided in a tubular neck (29) on the rear end of the outer piston (10) or a shaft (28) is directly connected to the valve closing part (26) of the outlet valve (23) and bounds with a neck (29) a portion of the outlet tube (24), preferably the compressible neck (29) being constructed in one piece with the piston shaft (21) and/or with the outer piston (10) and is thinner walled than the adjacent shaft portions.
  5. Discharging apparatus according to one of the preceding claims, characterized in that an overflow between the presuction chamber (17) and the pressure chamber (14) can be closed with an overflow valve (32), which is in particular opened at least at the end of the return travel and/or is at least partly directly formed by the piston sleeve (35), as well as preferably having two oppositely displaceable and in particular circular valve parts (33,34), whereof preferably one is formed by the inner piston or is located at one end of the associated piston sleeve (35) and preferably the rear end of the piston sleeve (35) of the inner piston (11) is in axial limited movable engagement with the associated end wall by means of wedge-shaped ring profiles or the piston sleeve (35) is held on the end wall by means of a snap connection (37) located on its inner circumference and the ring profiles form the valve parts of the overflow valve (32).
  6. Discharging apparatus according to one of the preceding claims, characterized in that an overflow between the presuction chamber (17) and the pressure chamber (14) has a slide valve and that preferably overflow openings (39a) in the free end of the chamber body (15a) are freed at the end of the return stroke by the piston sealing lip of the inner piston (11a) constituting a valve closing part (33a).
  7. Discharging apparatus according to one of the preceding claims, characterized in that the presuction chamber (17) is bounded by a chamber body (15) freely projecting into the cylinder block (3) and annularly surrounded by the pump chamber (14) and the inner piston (11) telescopically engaging therewith and in particular a restoring spring (20) for the outer piston (10) located in the presuction chamber (17) serves as a closing spring for the outlet valve (23), that preferably the pressure chamber (14) is provided with a pressure relief connection leading into the open and which is mechanically forcibly opened at the end of the pump travel and which is in particular formed by a stop-controlled, limited opening of the outlet valve (23) and that preferably a dog (40) for the valve closing part (26) of the outlet valve (23) is connected to a control head (22) for the outer piston (10) and which carries with it the valve closing part (26) at the end of the pump travel with respect to the outer piston (10) and in particular is provided on the compression-shortenable neck (29) of the outer piston (10) or the piston shaft (21).
  8. Discharging apparatus according to one of the preceding claims, characterized in that a compression-widenable neck (29) of the outer piston (10) in its starting position is at least partly grasped on its outer circumference against widening and in particular over most of its length is slidably guided on the longitudinal ribs (41) of a cylinder cover (7) of the cylinder block (3).
  9. Discharging apparatus according to one of the preceding claims, characterized in that for venting the reservoir at least one longitudinal channel (54) is provided in a piston path and its rear end, in the starting position, is located upstream of a piston lip of a piston unit (9a) and whose front end is preferably connected to the reservoir by means of a passage opening (43) in an annular shoulder of the cylinder block (3a) connected to the rear end of the pump chamber (14a).
  10. Discharging apparatus according to one of the preceding claims, characterized in that the rear end of a cylinder block (3a) is bounded by a component constructed in one piece therewith, particularly by at least one bent jacket tongue (7a) or the control head (22a) terminates the rear, freely projecting end of the cylinder block (3a) by engaging over and that preferably the cylinder block (3a) is constructed in one piece with a cap (4a) for fixing to a vessel neck and/or to a socket part (42) provided as a seal.
EP88106258A 1987-05-08 1988-04-20 Fluid dispenser Expired - Lifetime EP0289855B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88106258T ATE77594T1 (en) 1987-05-08 1988-04-20 DISPENSING DEVICE FOR MEDIA.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873715301 DE3715301A1 (en) 1987-05-08 1987-05-08 DISCHARGE DEVICE FOR MEDIA
DE3715301 1987-05-08

Publications (3)

Publication Number Publication Date
EP0289855A2 EP0289855A2 (en) 1988-11-09
EP0289855A3 EP0289855A3 (en) 1989-12-06
EP0289855B1 true EP0289855B1 (en) 1992-06-24

Family

ID=6327067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106258A Expired - Lifetime EP0289855B1 (en) 1987-05-08 1988-04-20 Fluid dispenser

Country Status (4)

Country Link
US (1) US5011046A (en)
EP (1) EP0289855B1 (en)
AT (1) ATE77594T1 (en)
DE (2) DE3715301A1 (en)

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Also Published As

Publication number Publication date
ATE77594T1 (en) 1992-07-15
US5011046A (en) 1991-04-30
DE3872303D1 (en) 1992-07-30
EP0289855A3 (en) 1989-12-06
EP0289855A2 (en) 1988-11-09
DE3715301A1 (en) 1988-11-24

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