EP0415259A1 - Dosing pump - Google Patents

Dosing pump Download PDF

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Publication number
EP0415259A1
EP0415259A1 EP90116104A EP90116104A EP0415259A1 EP 0415259 A1 EP0415259 A1 EP 0415259A1 EP 90116104 A EP90116104 A EP 90116104A EP 90116104 A EP90116104 A EP 90116104A EP 0415259 A1 EP0415259 A1 EP 0415259A1
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EP
European Patent Office
Prior art keywords
metering
piston
dosing
suction
sealing plate
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.)
Granted
Application number
EP90116104A
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German (de)
French (fr)
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EP0415259B1 (en
Inventor
Franz Röttel
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Gruenbeck Wasseraufbereitung GmbH
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Gruenbeck Wasseraufbereitung GmbH
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Priority to AT90116104T priority Critical patent/ATE97195T1/en
Publication of EP0415259A1 publication Critical patent/EP0415259A1/en
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Publication of EP0415259B1 publication Critical patent/EP0415259B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type

Definitions

  • the invention relates to a metering pump with a pump cylinder connected on the inlet side with a pre-delivery chamber and on the outlet side with a metering point and a metering piston interacting therewith and a membrane, the pre-delivery chamber can be above or to the side of the pump cylinder, and with a metering agent container via a suction line and a suction valve a return line having a pressure valve can be connected.
  • the pre-feed chamber is connected to a metering agent container via a suction line having a suction valve and a return line having a pressure valve.
  • the pre-delivery takes place via the suction line and the suction valve to the pre-delivery room.
  • the dosing piston takes the required amount of dosing agent from the pre-delivery chamber. The excess amount of the dosing agent is conveyed back into the dosing agent container via the pressure valve and the return line.
  • the metering piston must emerge from the compression ring in the cylinder chamber so that the compression chamber is vented. When the dosing piston is immersed in the compression ring, it is mechanically worn out very quickly. This causes high replacement costs for a low-value part, such as a compression ring.
  • the object of the invention is therefore to provide a metering pump for metering liquid media, in particular also aggressive and / or outgassing media, in which the metering piston no longer emerges from the compression ring and the pump acts self-priming and self-venting even against pressure.
  • FIGS. 1 to 3 A first exemplary embodiment of the invention is explained with reference to FIGS. 1 to 3, while FIG. 4 represents another exemplary embodiment.
  • FIG. 1 and 2 show the metering pump according to the invention during the metering and suction stroke
  • FIG. 3 shows, on an enlarged scale, a specific position of the pump during the suction stroke.
  • a metering pump 1 is provided with a housing 2, which has a compression space 3 and an overlying cylinder space 4.
  • the compression chamber 3 is connected on the input side to a metering container 7 via a suction valve 5 and a suction line 6.
  • the metering piston 8 is designed as a hollow piston and is guided by means of a piston guide 9, in which a compression ring 10 is located.
  • the top of the hollow piston is designed as a sealing plate 11, wherein the sealing plate 11 can have a sealing bead 12 on its top.
  • the cylinder space 4 is delimited at the top by a stop ring 13, through which the lifting plunger 21 can move freely, i.e. A gap 17 remains between the lifting plunger 21 and the inside diameter of the stop ring 13, through which the dosing agent can pass from the cylinder space 4 into the membrane space 16.
  • the diaphragm space 16 is delimited at the top by the pre-delivery diaphragm 18 and is in contact with the cylinder space 4 as long as the sealing plate 11 does not abut the stop ring 13.
  • the excess pre-conveyed medium is returned via a return valve 19 and a return line 33 into the dosing agent container 7 during the return stroke.
  • the dosing medium When the dosing medium is sucked out of the dosing agent container 7, it is fed into the cylinder chamber 4 via the suction line 6 and the bypass line 15 and the check valve 20 and from there through the suction effect of the pre-delivery membrane 18 through the gap 17 between the inside diameter of the stop ring 13 and the outside diameter of the lifting tappet 21 promoted in the membrane space 16.
  • the return valve 19 is closed during suction.
  • the hollow piston 8 with the sealing plate 11 is pressed by a spring 24 against a seal 22 on the lifting plunger 21 until the sealing plate 11 bears against the stop ring 13 when the plunger 21 moves further.
  • the lifting plunger 21 After completion of the suction stroke during the dosing stroke (see FIG. 1) the lifting plunger 21 is moved in the other direction via the eccentric 24 and the yoke 25 until the lifting plunger 21 lies sealingly on the sealing bead 12 of the sealing plate 11 and thus the through bore 23 of the Hollow piston 8 closes. During the further metering stroke, the peripheral edge 26 of the lifting plunger 21 takes over the power transmission to the hollow piston 8 and the spring 24. This ensures a constant pressure rigidity during the metering stroke. After reaching the sealing plate 11, the lifting plunger 21 continues to press the hollow piston 8 against the spring up to the lower maximum value set on the stroke adjustment 27.
  • the suction valve 5 is pressed against the sealing seat 28 and closes the suction line 6.
  • the dosing agent in the compression chamber 3 is thereby pressed into the dosing line 32 via the hose valve 31 via the transverse bore 30 in the cylinder 29.
  • the dosing medium sucked in too much via the pre-delivery membrane 18 and any gas bubbles which may be present are simultaneously released via the return valve 19 and the dosing stroke Return line 33 is fed back into the metering container 7.
  • the gas bubbles returned to the metering container 7 rise to the atmosphere after exiting the return line within the metering container and are not sucked in again.
  • the medium is sucked directly into the hollow piston 8 via the suction line 6, the suction valve 5 and the through bore 23.
  • the lifting plunger 21 lifts off the sealing lip 12 of the plate 11.
  • the dosing medium is then conveyed through the hollow piston 8 via the gap 17 into the membrane space 16 via the pre-delivery membrane 18.
  • the compression chamber is completely filled with dosing agent and vented.
  • a bypass line 15 and a check valve 20 are not required.
  • the embodiment is particularly suitable for small metering strokes.

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

Abstract

A metering pump comprises a diaphragm chamber with a diaphragm, a suction conduit connecting the diaphragm chamber with a metering agent tank, a pump cylinder defining a cylinder space and having an inlet connected to the diaphragm chamber and an outlet connected to a metering point through a metering conduit, and a metering piston in the pump cylinder. The metering piston is formed as a hollow tubular piston which comprises an annular seal disk at the side thereof opposite to the metering conduit. The cylinder space is defined by a stop ring and an actuating tappet movingly passes therethrough. At the beginning of a suction stroke the seal disk sealingly abuts the stop ring but allows the metering agent to pass through during the further movement of the tappet. The metering piston in no position thereof emerges from a compression ring.

Description

Die Erfindung betrifft eine Dosierpumpe mit einem eingangs­seitig mit einem Vorförderraum und ausgangsseitig mit einer Dosierstelle verbundenen Pumpenzylinder und einem damit zu­sammenwirkenden Dosierkolben sowie einer Membran, wobei der Vorförderraum oberhalb oder seitlich des Pumpenzylinders liegen kann, und mit einem Dosiermittelbehälter über eine ein Saug­ventil aufweisende Saugleitung und eine ein Druckventil aufweisende Rücklaufleitung verbindbar ist.The invention relates to a metering pump with a pump cylinder connected on the inlet side with a pre-delivery chamber and on the outlet side with a metering point and a metering piston interacting therewith and a membrane, the pre-delivery chamber can be above or to the side of the pump cylinder, and with a metering agent container via a suction line and a suction valve a return line having a pressure valve can be connected.

Bei bekannten Dosierpumpen mit Dosierkolben-Zylindereinrichtung und Vorfördermembran ist der Vorförderraum über eine ein Saug­ventil aufweisende Saugleitung und eine ein Druckventil aufwei­sende Rückleitung mit einem Dosiermittelbehälter verbunden. Die Vorförderung erfolgt über die Saugleitung und das Saugventil zum Vorförderraum. Aus dem Vorförderraum entnimmt der Dosier­kolben die erforderliche Menge Dosiermittel. Die überschüssige Menge des Dosiermittels wird über das Druckventil und die Rücklaufleitung in den Dosiermittelbehälter zurückbefördert.In known metering pumps with metering piston-cylinder device and pre-feed membrane, the pre-feed chamber is connected to a metering agent container via a suction line having a suction valve and a return line having a pressure valve. The pre-delivery takes place via the suction line and the suction valve to the pre-delivery room. The dosing piston takes the required amount of dosing agent from the pre-delivery chamber. The excess amount of the dosing agent is conveyed back into the dosing agent container via the pressure valve and the return line.

Dabei muß der Dosierkolben aus dem Kompressionsring im Zylin­derraum austauchen, damit eine Entlüftung des Kompressionsraums gegeben ist. Beim Eintauchen des Dosierkolbens in den Kom­pressionsring wird dieser sehr schnell mechanisch verschlissen. Dies verursacht hohe Austauschkosten für ein geringwertiges Teil, wie es ein Kompressionsring darstellt.The metering piston must emerge from the compression ring in the cylinder chamber so that the compression chamber is vented. When the dosing piston is immersed in the compression ring, it is mechanically worn out very quickly. This causes high replacement costs for a low-value part, such as a compression ring.

Aufgabe der Erfindung ist es deshalb, eine Dosierpumpe zum Dosieren flüssiger Medien, insbesondere auch agressiver und/­oder ausgasender Medien zu schaffen, bei welcher der Dosierkol­ben nicht mehr aus dem Kompressionsring austaucht und die Pumpe selbstansaugend und selbstentlüftend auch gegen Druck wirkt.The object of the invention is therefore to provide a metering pump for metering liquid media, in particular also aggressive and / or outgassing media, in which the metering piston no longer emerges from the compression ring and the pump acts self-priming and self-venting even against pressure.

Außerdem soll ein Einbau der Dosierpumpe in senkrechter oder wagrechter Anordnung möglich sein.In addition, it should be possible to install the metering pump in a vertical or horizontal arrangement.

Diese Aufgabe wird durch die im Anspruch 1 gekennzeichneten Mittel gelöst. Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the means characterized in claim 1. Developments of the invention are the subject of the dependent claims.

Ein erstes Ausführungsbeispiel der Erfindung wird anhand der Figuren 1 bis 3 erläutert, während die Figur 4 ein anderes Ausführungsbeispiel darstellt.A first exemplary embodiment of the invention is explained with reference to FIGS. 1 to 3, while FIG. 4 represents another exemplary embodiment.

Dabei zeigen die Figuren 1 und 2 die erfindungsgemäße Dosier­pumpe während des Dosier- und Saughubs, während die Figur 3 im vergrößerten Maßstab eine bestimmte Position der Pumpe während des Saughubs wiedergibt.1 and 2 show the metering pump according to the invention during the metering and suction stroke, while FIG. 3 shows, on an enlarged scale, a specific position of the pump during the suction stroke.

In der Figur 1 ist eine Dosierpumpe 1 mit einem Gehäuse 2 dar gestellt, welche einen Kompressionsraum 3 und einen darüberlie­genden Zylinderraum 4 aufweist. Der Kompressionsraum 3 ist ein­gangsseitig über ein Saugventil 5 und eine Saugleitung 6 mit einem Dosierbehälter 7 verbunden.In the figure 1, a metering pump 1 is provided with a housing 2, which has a compression space 3 and an overlying cylinder space 4. The compression chamber 3 is connected on the input side to a metering container 7 via a suction valve 5 and a suction line 6.

Der Dosierkolben 8 ist als Hohlkolben ausgebildet und wird mittels einer Kolbenführung 9, in welcher sich ein Kom­pressionsring 10 befindet, geführt. Die Oberseite des Hohl­kolbens ist als Dichtteller 11 ausgebildet, wobei der Dicht­teller 11 an seiner Oberseite einen Dichtwulst 12 aufweisen kann. Der Zylinderraum 4 wird oben durch einen Anschlagring 13 begrenzt, durch den sich der Hubstößel 21 frei bewegen kann, d.h. zwischen Hubstößel 21 und dem Innendurchmesser des An­schlagringes 13 verbleibt ein Spalt 17, durch den das Dosier­mittel aus dem Zylinderraum 4 in den Membranraum 16 gelangen kann.The metering piston 8 is designed as a hollow piston and is guided by means of a piston guide 9, in which a compression ring 10 is located. The top of the hollow piston is designed as a sealing plate 11, wherein the sealing plate 11 can have a sealing bead 12 on its top. The cylinder space 4 is delimited at the top by a stop ring 13, through which the lifting plunger 21 can move freely, i.e. A gap 17 remains between the lifting plunger 21 and the inside diameter of the stop ring 13, through which the dosing agent can pass from the cylinder space 4 into the membrane space 16.

Der Membranraum 16 ist nach oben durch die Vorfördermembrane 18 begrenzt und steht, solange der Dichtteller 11 nicht am Anschlagring 13 anliegt, mit dem Zylinderraum 4 in Verbindung. Das überschüssig vorgeförderte Medium wird über ein Rücklauf­ventil 19 und eine Rücklaufleitung 33 in den Dosiermittelbe­hälter 7 beim Rückhub zurückgeführt.The diaphragm space 16 is delimited at the top by the pre-delivery diaphragm 18 and is in contact with the cylinder space 4 as long as the sealing plate 11 does not abut the stop ring 13. The excess pre-conveyed medium is returned via a return valve 19 and a return line 33 into the dosing agent container 7 during the return stroke.

Beim Ansaugen des Dosiermediums aus dem Dosiermittelbehälter 7 wird dieses über die Saugleitung 6 und die Umgehungsleitung 15 und das Rückschlagventil 20 in den Zylinderraum 4 und von dort durch die Saugwirkung der Vorfördermembrane 18 durch den Spalt 17 zwischen dem Innendurchmesser des Anschlagringes 13 und dem Außendurchmesser des Hubstößels 21 in den Membranraum 16 gefördert.When the dosing medium is sucked out of the dosing agent container 7, it is fed into the cylinder chamber 4 via the suction line 6 and the bypass line 15 and the check valve 20 and from there through the suction effect of the pre-delivery membrane 18 through the gap 17 between the inside diameter of the stop ring 13 and the outside diameter of the lifting tappet 21 promoted in the membrane space 16.

Beim Ansaugen ist das Rücklaufventil 19 geschlossen. Bei Beginn des Saughubs wird der Hohlkolben 8 mit dem Dichtteller 11 durch eine Feder 24 gegen eine Dichtung 22 am Hubstößel 21 gepreßt, bis der Dichtteller 11 bei weiterer Bewegung des Stößels 21 am Anschlagring 13 anliegt.The return valve 19 is closed during suction. At the beginning of the suction stroke, the hollow piston 8 with the sealing plate 11 is pressed by a spring 24 against a seal 22 on the lifting plunger 21 until the sealing plate 11 bears against the stop ring 13 when the plunger 21 moves further.

Hat der Hohlkolben 8 beim Saughub, wie in den Figuren 2 und 3 dargestellt, den Anschlagring 13 erreicht, verschließt der Dichtteller 11 des Hohlkolbens über den Dichtring 14 das wei­tere Ansaugen von Dosiermittel durch den Spalt 17. Es kann so­mit kein Dosiermedium mehr über die Umgehungsleitung 15 und das Rückschlagventil 20 angesaugt werden. Beim weiteren Saug­hub des Hubstößels 21 wird die Durchgangsbohrung 23 des Hohl­kolbens 8 geöffnet. Das Ansaugen erfolgt nun auf dem direkten Weg durch das Ansaugventil 5 und den Kompressionsraum 3 sowie die Durchgangsbohrung 23 des Hohlkolbens. Der Kompressionsraum 3 wird mit Dosiermedium gefüllt und gleichzeitig vollständig entlüftet, ohne daß der Hohlkolben 8 aus der Kolbenführung 9 bzw. dem Kompressionsring 10 austreten muß.Has the hollow piston 8 during the suction stroke, as in FIGS. 2 and 3 shown, reaches the stop ring 13, the sealing plate 11 of the hollow piston closes the further suction of dosing agent through the gap 17 via the sealing ring 14. During a further suction stroke of the lifter 21, the through bore 23 of the hollow piston 8 is opened. The suction is now carried out on the direct path through the suction valve 5 and the compression chamber 3 and the through bore 23 of the hollow piston. The compression chamber 3 is filled with dosing medium and at the same time completely vented without the hollow piston 8 having to emerge from the piston guide 9 or the compression ring 10.

Nach Beendigung des Saughubs wird beim Dosierhub (vgl. Fig. 1) der Hubstößel 21 über den Exzenter 24 und das Joch 25 in die andere Richtung bewegt, bis der Hubstößel 21 auf dem Dichtwulst 12 des Dichttellers 11 dichtend aufliegt und somit die Durch­gangsbohrung 23 des Hohlkolbens 8 verschließt. Der umlaufende Rand 26 des Hubstößels 21 übernimmt beim weiteren Dosierhub die Kraftübertragung auf den Hohlkolben 8 und die Feder 24. Dadurch wird eine gleichbleibende Drucksteifigkeit beim Dosierhub ge­währleistet. Der Hubstößel 21 drückt nach Erreichen des Dicht­tellers 11 den Hohlkolben 8 gegen die Feder weiter bis zu dem an der Hubverstellung 27 eingestellten unteren Maximalwert.After completion of the suction stroke during the dosing stroke (see FIG. 1) the lifting plunger 21 is moved in the other direction via the eccentric 24 and the yoke 25 until the lifting plunger 21 lies sealingly on the sealing bead 12 of the sealing plate 11 and thus the through bore 23 of the Hollow piston 8 closes. During the further metering stroke, the peripheral edge 26 of the lifting plunger 21 takes over the power transmission to the hollow piston 8 and the spring 24. This ensures a constant pressure rigidity during the metering stroke. After reaching the sealing plate 11, the lifting plunger 21 continues to press the hollow piston 8 against the spring up to the lower maximum value set on the stroke adjustment 27.

Während des Dosierhubs des Hubstößels 21 und des Hohlkolbens 8 wird das Saugventil 5 gegen den Dichtsitz 28 gepreßt und ver­schließt die Saugleitung 6. Das Dosiermittel im Kompressions­raum 3 wird dadurch über die im Zylinder 29 angebrachte Quer­bohrung 30 über das Schlauchventil 31 in die Dosierleitung 32 gedrückt.During the dosing stroke of the lifting plunger 21 and the hollow piston 8, the suction valve 5 is pressed against the sealing seat 28 and closes the suction line 6. The dosing agent in the compression chamber 3 is thereby pressed into the dosing line 32 via the hose valve 31 via the transverse bore 30 in the cylinder 29.

Das über die Vorfördermembrane 18 zuviel angesaugte Dosier­medium und die eventuell vorhandenen Gasblasen werden beim Dosierhub gleichzeitig über das Rücklaufventil 19 und die Rücklaufleitung 33 in den Dosierbehälter 7 zurückgeführt. Die in den Dosierbehälter 7 zurückgeführten Gasblasen steigen nach Austritt aus der Rücklaufleitung innerhalb des Dosierbehälters zur Atmosphäre auf und werden nicht wieder eingesaugt.The dosing medium sucked in too much via the pre-delivery membrane 18 and any gas bubbles which may be present are simultaneously released via the return valve 19 and the dosing stroke Return line 33 is fed back into the metering container 7. The gas bubbles returned to the metering container 7 rise to the atmosphere after exiting the return line within the metering container and are not sucked in again.

Ist der Dosierhub abgeschlossen, so folgt angetrieben über den Exzenter 24 ein neuer Saughub.When the metering stroke is completed, a new suction stroke follows via the eccentric 24.

Bei dem in Fig. 4 dargestellten Ausführungsbeispiel wird das Medium direkt über die Saugleitung 6, das Saugventil 5 und die Durchgangsbohrung 23 im Hohlkolben 8 angesaugt. Beim weiteren Saughub hebt der Hubstößel 21 von der Dichtlippe 12 des Tellers 11 ab. Über die Vorfördermembrane 18 wird dann das Dosiermittel durch den Hohlkolben 8 über den Spalt 17 in den Membranraum 16 gefördert. Der Kompressionsraum wird vollständig mit Dosiermittel gefüllt und entlüftet. Bei dieser Ausführung ist keine Umgehungsleitung 15 und kein Rückschlagventil 20 erforderlich. Die Ausführungsform eignet sich besonders für kleine Dosierhübe.In the embodiment shown in FIG. 4, the medium is sucked directly into the hollow piston 8 via the suction line 6, the suction valve 5 and the through bore 23. During a further suction stroke, the lifting plunger 21 lifts off the sealing lip 12 of the plate 11. The dosing medium is then conveyed through the hollow piston 8 via the gap 17 into the membrane space 16 via the pre-delivery membrane 18. The compression chamber is completely filled with dosing agent and vented. In this embodiment, a bypass line 15 and a check valve 20 are not required. The embodiment is particularly suitable for small metering strokes.

Die übrigen Teile entsprechen denen im Ausführungsbeispiel nach den Figuren 1 und 2.The remaining parts correspond to those in the exemplary embodiment according to FIGS. 1 and 2.

Claims (7)

1. Dosierpumpe mit einem eingangsseitig mit einem Vorförder­raum und ausgangsseitig mit einer Dosierstelle verbundenen Pumpenzylinder und einem damit zusammenwirkenden Dosier­kolben sowie einer Membran, und einer mit einem Dosiermittel­behälter verbindbaren Saugleitung mit einem Saugventil und einer ein Druckventil aufweisenden Rückleitung,
dadurch gekennzeichnet, daß der Dosierkolben (8) als Hohl­kolben ausgebildet ist, der auf der der Dosierleitung (32) gegenüberliegenden Seite einen ringförmigen Dichtteller (11) aufweist, der kraftschlüssig gegen ein Ende des Hubstößels (21) gedrückt wird, daß der Zylinderraum (4) auf der Seite des Hubstößels (21) durch einen Anschlagring (13) begrenzt ist, durch den sich der Hubstößel (21) unter Bildung eines Spalts (17) frei hindurchbewegen kann, daß das ausgangs­seitige Ende des Zylinderraumes (4) durch eine Kolbenfüh­rung (9) gebildet wird, in der sich der Hohlkolben (8) wäh­rend des gesamten Saug- und Dosierhubs bewegt, und daß der Abstand zwischen Kompressionsraum (3) und Dichtteller (11), die Lage des Anschlagringes (13) im Zylinderraum (4) und die Größe des Hubs des Hubstößels (21) so bemessen sind, daß in einer zweiten Phase des Saughubs der Dichtteller (11) am Anschlagring (13) dichtend anliegt und am Ende des Saug­hubs und in einer ersten Phase des Dosierhubs das Medium aus dem Membranraum (16) durch die Durchgangsbohrung (23) des Hohlkolbens (8) in den Kompressionsraum (3) fließen kann.1.Dosing pump with a pump cylinder connected on the inlet side with a pre-delivery chamber and on the outlet side with a dosing point and a dosing piston interacting with it and a membrane, and a suction line connectable to a dosing agent container with a suction valve and a return line having a pressure valve,
characterized in that the metering piston (8) is designed as a hollow piston which, on the side opposite the metering line (32), has an annular sealing plate (11) which is non-positively pressed against one end of the lifting plunger (21) such that the cylinder space (4 ) on the side of the lifting plunger (21) is limited by a stop ring (13) through which the lifting plunger (21) can move freely, forming a gap (17), that the outlet-side end of the cylinder space (4) is guided by a piston guide ( 9) is formed in which the hollow piston (8) moves during the entire suction and metering stroke, and that the distance between the compression space (3) and sealing plate (11), the position of the stop ring (13) in the cylinder space (4) and the size of the stroke of the lifting plunger (21) are dimensioned such that in a second phase of the suction stroke the sealing plate (11) lies sealingly against the stop ring (13) and at the end of the suction stroke and in a first phase of the metering stroke the medium can flow from the membrane space (16) through the through hole (23) of the hollow piston (8) into the compression space (3). 2. Dosierpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß der Zylinderraum (4) mit dem Dosiermittelbehälter (7) über eine ein Saugventil (20) aufweisende Umgehungsleitung (15) verbunden ist.2. dosing pump according to claim 1,
characterized in that the cylinder chamber (4) is connected to the dosing agent container (7) via a bypass line (15) having a suction valve (20). 3. Dosierpumpe nach Anspruch 2,
dadurch gekennzeichnet, daß die Kolbenführung (9) einen Kom­pressionsring (10) aufweist.3. dosing pump according to claim 2,
characterized in that the piston guide (9) has a compression ring (10). 4. Dosierpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß der Dichtteller (11) an seiner am Hubstößel (21) anliegenden Seite einen Dichtwulst (12) aufweist.4. dosing pump according to claim 1,
characterized in that the sealing plate (11) has a sealing bead (12) on its side abutting the lifting plunger (21). 5. Dosierpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß der Anschlagring (13) an seiner am Dichtteller (11) anliegenden Seite mindestens einen Dichtring (14) aufweist.5. dosing pump according to claim 1,
characterized in that the stop ring (13) has at least one sealing ring (14) on its side abutting the sealing plate (11). 6. Dosierpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß der Hubstößel (21) an seiner am Dichtteller (11) anliegenden Seite einen umlaufenden Rand (26) aufweist.6. dosing pump according to claim 1,
characterized in that the lifting plunger (21) has a peripheral edge (26) on its side abutting the sealing plate (11). 7. Dosierpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß die kraftschlüssige Verbindung durch eine Feder (24) gebildet wird, die sich an der Kol­benführung (9) und am Dichtteller (11) abstützt.7. dosing pump according to claim 1,
characterized in that the non-positive connection is formed by a spring (24) which is supported on the piston guide (9) and on the sealing plate (11).
EP90116104A 1989-08-28 1990-08-22 Dosing pump Expired - Lifetime EP0415259B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90116104T ATE97195T1 (en) 1989-08-28 1990-08-22 DOSING PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3928411A DE3928411A1 (en) 1989-08-28 1989-08-28 DOSING PUMP
DE3928411 1990-08-23

Publications (2)

Publication Number Publication Date
EP0415259A1 true EP0415259A1 (en) 1991-03-06
EP0415259B1 EP0415259B1 (en) 1993-11-10

Family

ID=6388043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90116104A Expired - Lifetime EP0415259B1 (en) 1989-08-28 1990-08-22 Dosing pump

Country Status (5)

Country Link
US (1) US5017105A (en)
EP (1) EP0415259B1 (en)
JP (1) JPH03117687A (en)
AT (1) ATE97195T1 (en)
DE (2) DE3928411A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4219663C2 (en) * 1992-06-16 1996-01-18 Prominent Dosiertechnik Gmbh Liquid dosing pump
US5290159A (en) * 1993-03-04 1994-03-01 Exxon Production Research Company Downhole pump of constant differential hydraulic pressure
US6164924A (en) * 1998-09-01 2000-12-26 Oil-Rite Corporation Piston and drive assembly for use in a pump
CN110194364B (en) * 2019-05-08 2021-03-02 胡乔生 Two-stage metering distribution system and control method thereof
DE102022115955A1 (en) 2022-06-27 2023-12-28 Prominent Gmbh Dosing pump with stroke adjustment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431615A1 (en) * 1978-07-18 1980-02-15 Webasto Werk Baier Kg W ELECTROMAGNETIC FUEL TRANSPORT AND DOSING PUMP
US4278406A (en) * 1979-11-07 1981-07-14 R. W. Beckett Corporation Electromagnetic pump
DE3210821A1 (en) * 1982-03-24 1983-10-13 Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt DOSING PUMP
EP0117969A2 (en) * 1983-01-08 1984-09-12 Lang Apparatebau Gmbh Dosing piston pump with diaphragm

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4898632A (en) * 1972-03-27 1973-12-14
DE7733135U1 (en) * 1977-10-27 1978-03-23 Sukatsch, Alexander, 6702 Bad Duerkheim DOSING PUMP
DE2831625A1 (en) * 1978-07-19 1980-02-07 Lang Apparatebau Gmbh DEVICE FOR DOSING A CHEMICAL SOLUTION IN FLOWING FRESH LIQUID
DE3134940C2 (en) * 1981-09-03 1983-12-15 Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt Dosing pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431615A1 (en) * 1978-07-18 1980-02-15 Webasto Werk Baier Kg W ELECTROMAGNETIC FUEL TRANSPORT AND DOSING PUMP
US4278406A (en) * 1979-11-07 1981-07-14 R. W. Beckett Corporation Electromagnetic pump
DE3210821A1 (en) * 1982-03-24 1983-10-13 Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt DOSING PUMP
EP0117969A2 (en) * 1983-01-08 1984-09-12 Lang Apparatebau Gmbh Dosing piston pump with diaphragm

Also Published As

Publication number Publication date
DE3928411C2 (en) 1993-05-13
EP0415259B1 (en) 1993-11-10
DE3928411A1 (en) 1991-03-07
ATE97195T1 (en) 1993-11-15
JPH03117687A (en) 1991-05-20
DE59003436D1 (en) 1993-12-16
US5017105A (en) 1991-05-21

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