EP0672221B1 - Metering pump with vent - Google Patents

Metering pump with vent Download PDF

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Publication number
EP0672221B1
EP0672221B1 EP94901899A EP94901899A EP0672221B1 EP 0672221 B1 EP0672221 B1 EP 0672221B1 EP 94901899 A EP94901899 A EP 94901899A EP 94901899 A EP94901899 A EP 94901899A EP 0672221 B1 EP0672221 B1 EP 0672221B1
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EP
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Prior art keywords
valve
metering pump
displacement
pump
chamber
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EP94901899A
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German (de)
French (fr)
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EP0672221A1 (en
Inventor
Joachim Klein
Herbert Hunklinger
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Ecolab Engineering GmbH
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Lang Apparatebau GmbH
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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

Definitions

  • the invention relates to a metering pump for metered conveying of liquids with a suction valve built into a suction line coming from a suction tank, a pump chamber behind it with a pump element changing its displacement volume, a pressure valve leading to the metering line connection and a ventilation and bypass built into a return line leading to the suction tank -Valve.
  • a metering pump of the above type is known from FR-PS 21 20 945. It is designed as a piston diaphragm pump, which has a comparatively large pump chamber, which has a suction valve at the bottom and a vent valve at the top, and a comparatively small metering cylinder space to be separated from it by a metering piston that is to be driven back and forth in the middle of a pumping membrane that forms the pump element which branches off the pressure valve to the metering line connection.
  • the invention is therefore based on the object of improving and perfecting a metering pump of the type mentioned at the outset in such a way that if the metering liquid is adequately vented, the necessary return flow via the venting and bypass valve is as small as possible and thus also the drive expenditure and the susceptibility to wear allowed to be kept correspondingly small.
  • This object is achieved on the basis of a metering pump of the type mentioned at the outset in that between the pressure valve and the pump chamber a valve chamber is provided which is separated from the latter by a non-return central valve and a movable control wall, into which the valve chamber controlled by the control wall is located at the respective position Suction stroke of the pump goose opening and during its pressure stroke closing vent valve is installed.
  • the metering pump can be operated in such a way that practically the entire amount of metering liquid conveyed by its pumping element is pressed into the metering line connection via the pressure valve, whereby during the respective suction stroke of the pumping element a permanent automatic venting of the metering back pressure that is independent Valve chamber is guaranteed via its ventilation and bypass valve.
  • a movable displacement wall the volume of which changes in the opposite direction to the control wall and is under pretension, is provided in the valve chamber. This can ensure that during the respective suction stroke of the pumping goose and the associated suction movement of the control wall and the opening of the ventilation and bypass valve caused by the latter, no back-suction to the valve chamber can occur, at least not if the displacement volume, especially as Membrane formed displacement wall is at least as large as the displacement volume of the control wall, in particular also designed as a membrane.
  • the displacement volume of the pumping gans which preferably consists of a conveying membrane to be driven back and forth, is in any case larger than that of the control membrane, preferably larger than its double displacement volume.
  • the control membrane along with the middle valve and the vent valve on the one hand and the pressure valve and the displacement membrane on the other hand are arranged opposite each other in the valve space below and above or to the left and right thereof.
  • the center valve is preferably integrated in the control membrane.
  • the latter can be provided in the center with a valve bushing which has the valve bore and the valve seat of the central valve and a support bush which is screwed thereto for the valve body of the venting valve connected thereto via individual support arms.
  • a pressure spring which places the valve ball at about 1 bar pretension and on the compensating diaphragm a pressure spring which sets it at about 0.5 bar.
  • the metering pump shown is provided with a basic housing body 1 and a valve housing 3 which is screw-connected to it via an intermediate body 2 and in which the valve chamber 4 is located.
  • the pump chamber 5 is located in the basic housing 1 with the pump element 6 present therein, which essentially consists of a delivery membrane 7 to be driven back and forth in the direction of the arrows.
  • the drive motor required for this is not shown.
  • the suction valve 8 is provided, the valve body of which, designed as a valve ball 8 ', rests on the seat seal 10 located in the connecting piece 9 or is pressed against it by the compression spring 8 " Suction tank to connect incoming suction line.
  • the pump chamber 5 is to be connected to the valve chamber 4 via the center bore 11 penetrating the intermediate body 2 and the non-return center valve generally designated 12 or to be separated therefrom in the closed position of the center valve.
  • the control membrane 13 is for this provided in the center with a valve sleeve 16 forming the valve bore 14 and the valve seat 15, which rests on the intermediate body 2 via arms 16 ′ present on it at the bottom such that the control diaphragm 13 is always completely acted upon by the liquid pressure present in the central bore 11.
  • a compression spring 17 is arranged which acts on the control wall or membrane 13 in the direction of the valve chamber 4.
  • the valve sleeve 16 is screwed under clamping of the inner parts of the control membrane 13 to the support sleeve 18, on which there are support arms 18 'which hold the control membrane 13 or its support sleeve 18 with the valve body 19 of the ventilation and bypass valve, generally designated 20 connect.
  • the valve body 19 is clipped with its lower end between the upper ends of the support arms 18 'like a barb. It is additionally held in it by the pressure spring 12 ′′, which is supported on the underside of it and presses the valve ball 12 ′ of the central valve 12 against its valve seat 15.
  • the pressure spring 12 ′′ and the valve ball 12 ′ are accommodated in the space lying between the support arms 18 ′ which is in constant communication with the actual valve chamber 4 via the gaps between the support arms 18 'or belongs to it.
  • the compression spring 12 "serves to ensure the valve function. However, it can also be omitted if the valve ball 12 'is held in its closed position under its own weight.
  • connection hole 21 for a return line leading to the suction tank, not shown.
  • the valve body 19 engages in the smaller bore section 21 'with its upper, approximately cruciform profiled guide projection 19'.
  • sealing ring 19 ′′ which cooperates with the wall of the bore section 21 ′ which has a smaller diameter and forms the valve seat surface.
  • a line leading to the metering line connection 22 branches off from the valve chamber 4 with the pressure valve 23, which line is also designed as a valve ball 23 ′ which is pretensioned by a compression spring 24.
  • the valve ball 23 ' is acted upon by the spring 24 with a preload pressure of approximately 1 bar.
  • a prestressing spring 25 here designed as a diaphragm, which can change the volume of the valve chamber 4 in opposite directions to the control membrane 13.
  • This displacement membrane 26 is acted upon by the compression spring 26 acting on it with a prestressing pressure of about 0.5 bar.
  • the displacement volume of the displacement membrane 26 is equal to or slightly larger than the displacement volume of the control membrane 13.
  • the space containing the compression spring 25 is connected to the outside atmosphere via the vent hole 27.
  • the displacement volume of the displacement membrane 26 can be adjusted, for example by any screw-adjustable design of the pot base 3 'forming the spring abutment in the valve housing 3, the pot base 3' then thus forming an adjusting screw accessible from the outside. Due to the pressure spring 8 ′′ present in the suction valve 8 ′′, when counterpressure is present in the suction valve during the movement of the delivery membrane 7, a precisely defined pressure difference between the valve chamber 4 and the pump chamber 5 is achieved and thus the switching accuracy of the ventilation device is increased.
  • the center valve 12 need not necessarily be integrated into the control membrane 13. Rather, it can also be arranged separately from the latter between the valve chamber 4 and the pump chamber 5.
  • the control membrane 13 is then designed as a closed membrane, which, however, still controls the valve body 19 belonging to the vent valve 20.
  • the control membrane 13 can in principle also be replaced by a control piston, which forms the control wall and is to be arranged accordingly, with a groove or O-ring as a sealing element.
  • the displacement membrane 26 which could be replaced by an appropriately designed and arranged displacement piston.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • External Artificial Organs (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

PCT No. PCT/EP93/03333 Sec. 371 Date Aug. 7, 1995 Sec. 102(e) Date Aug. 7, 1995 PCT Filed Nov. 27, 1993 PCT Pub. No. WO94/13956 PCT Pub. Date Jun. 23, 1994Metering pumps for the metered feed of liquids are fitted with an intake valve built into an intake line from an intake container, a pump chamber downstream of it with a pumping component altering its displacement volume, a pressure valve leading to the metering connector and a vent and by-pass valve built into a return line leading to the intake container. In order to keep the quality of by-passed metering liquid as small as possible while maintaining adequate venting, there is valve chamber between the pressure valve and the pump chamber and separated from the latter by a return valve and a movable control wall, in which is incorporated the vent controlled by the control wall, opening on the suction stroke of the pumping component and closing on its delivery stroke. .There is also preferably in the valve chamber a prestressed displacement wall altering the volume of the valve chamber in the opposite direction to that of the control wall.

Description

Die Erfindung betrifft eine Dosierpumpe zum dosierten Fördern von Flüssigkeiten mit einem in eine von einem Ansaugbehälter kommende Ansaugleitung eingebauten Saugventil, einer dahinter liegenden Pumpenkammer mit deren Verdrängungsvolumen änderndem Pumporgan, einem zum Dosierleitungsanschluß führenden Druckventil und einem in eine zum Ansaugbehälter führende Rückleitung eingebauten Entlüftungs- und Bypass-Ventil.The invention relates to a metering pump for metered conveying of liquids with a suction valve built into a suction line coming from a suction tank, a pump chamber behind it with a pump element changing its displacement volume, a pressure valve leading to the metering line connection and a ventilation and bypass built into a return line leading to the suction tank -Valve.

Eine Dosierpumpe obiger Art ist durch die FR-PS 21 20 945 bekannt. Sie ist als Kolben-Membranpumpe ausgebildet, die eine vergleichsweise große, unten das Saugventil und oben das Entlüftungsventil aufweisende Pumpenkammer und einen davon durch einen mittig auf einer das Pumporgan bildenden, hin und her anzutreibenden Fördermembran sitzenden Dosierkolben zu trennenden, vergleichsweise kleinen Dosierzylinderraum aufweist, von dem das Druckventil zum Dosierleitungsanschluß abzweigt. Hier wird beim jeweiligen, dem Dosierhub des Dosierkolbens entsprechenden Druckhub der Fördermembran über das in der Pumpenkammer oben angeordnete Entlüftungs- und Bypass-Ventil der weitaus überwiegende Teil der in der Pumpenkammer vorhandenen Flüssigkeit neben etwa in letzterer vorhandener Luft über die Rückleitung zum Ansaugbehälter zurückgeführt, da das Verdrängungsvolumen der Fördermembran jeweils ein Vielfaches des Verdrängungsvolumens des Dosierkolbens beträgt. Dieser große Bypass-Anteil erfordert nicht nur einen erhöhten Pumpenenergieaufwand, sondern bedingt auch einen vermehrten Verschleiß an wichtigen Pumpenteilen, insbesondere am Saug- und Druckventil.A metering pump of the above type is known from FR-PS 21 20 945. It is designed as a piston diaphragm pump, which has a comparatively large pump chamber, which has a suction valve at the bottom and a vent valve at the top, and a comparatively small metering cylinder space to be separated from it by a metering piston that is to be driven back and forth in the middle of a pumping membrane that forms the pump element which branches off the pressure valve to the metering line connection. Here, with the respective pressure stroke of the delivery membrane corresponding to the metering stroke of the metering piston, the pressure in the pump chamber Venting and bypass valve arranged at the top, the vast majority of the liquid present in the pump chamber, in addition to any air present in the latter, is returned via the return line to the suction container, since the displacement volume of the delivery membrane is in each case a multiple of the displacement volume of the metering piston. This large proportion of bypass not only requires increased pump energy consumption, but also requires increased wear on important pump parts, in particular on the suction and pressure valve.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Dosierpumpe der eingangs erwähnten Gattung dahingehend zu verbessern und zu vervollkommnen, daß sie bei ausreichender Entlüftung der Dosierflüssigkeit deren dazu notwendigen Rücklauf über das Entlüftungs- und Bypassventil so klein wie möglich und damit auch den Antriebsaufwand sowie die Verschleißanfälligkeit entsprechend klein zu halten erlaubt. Diese Aufgabe wird ausgehend von einer Dosierpumpe der eingangs erwähnten Gattung erfindungsgemäß dadurch gelöst, daß zwischen dem Druckventil und der Pumpenkammer ein von letzterer durch ein Rückschlag-Mittelventil und eine bewegliche Steuerwand getrennter Ventilraum vorgesehen ist, in den das durch die Steuerwand gesteuerte, sich beim jeweiligen Saughub des Pumporgans öffnende und bei dessen Druckhub schließende Entlüftungsventil eingebaut ist. Hierdurch kommt man zu einer Dosierpumpe, bei der über den Ventilraum und das von ihr abzweigende Entlüftungs- und Bypass-Ventil eine hinreichende Entlüftung der Dosierflüssigkeit insbesondere auch beim Anlaufen der Dosierpumpe erreichbar ist, ohne daß dazu ein nennenswerter oder gar größerer Teil der von dem Pumporgan in die Pumpenkammer angesaugten und aus ihr jeweils verdrängten Dosierflüssigkeit über das Entlüftungs- und Bypass-Ventil zum Ansaugbehälter zurückgeführt werden müßte. Vielmehr kann jedenfalls nach Ende des anfänglichen Ansaug- und Entlüftungsvorganges die Dosierpumpe so betrieben werden, daß praktisch die gesamte von ihrem Pumporgan geförderte Dosierflüssigkeitsmenge über das Druckventil in den Dosierleitungsanschluß gedrückt wird, wobei beim jeweiligen Saughub des Pumporgans eine vom Dosiergegendruck unabhängige, dauerhafte selbsttätige Entlüftung des Ventilraums über dessen Entlüftungs- und Bypass-Ventil gewährleistet ist.The invention is therefore based on the object of improving and perfecting a metering pump of the type mentioned at the outset in such a way that if the metering liquid is adequately vented, the necessary return flow via the venting and bypass valve is as small as possible and thus also the drive expenditure and the susceptibility to wear allowed to be kept correspondingly small. This object is achieved on the basis of a metering pump of the type mentioned at the outset in that between the pressure valve and the pump chamber a valve chamber is provided which is separated from the latter by a non-return central valve and a movable control wall, into which the valve chamber controlled by the control wall is located at the respective position Suction stroke of the pump goose opening and during its pressure stroke closing vent valve is installed. This results in a metering pump in which sufficient venting of the metering liquid can be achieved, in particular also when the metering pump is started, via the valve chamber and the branching-off venting and bypass valve, without a noteworthy or even larger part of that from the pumping element dosing liquid sucked into the pump chamber and displaced from it in each case would have to be returned to the suction tank via the ventilation and bypass valve. Rather, in any case, after the end of the initial suction and venting process, the metering pump can be operated in such a way that practically the entire amount of metering liquid conveyed by its pumping element is pressed into the metering line connection via the pressure valve, whereby during the respective suction stroke of the pumping element a permanent automatic venting of the metering back pressure that is independent Valve chamber is guaranteed via its ventilation and bypass valve.

Nach einem weiteren Merkmal der Erfindung ist im Ventilraum eine dessen Volumen jeweils gegensinnig zur Steuerwand ändernde, unter Vorspannung stehende, bewegliche Verdrängungswand vorgesehen. Hierdurch kann sichergestellt werden, daß beim jeweiligen Saughub des Pumporgans und der damit verbundenen Ansaugbewegung der Steuerwand sowie der dadurch hervorgerufenen Öffnung des Entlüftungs- und Bypass-Ventils durch letzteres hindurch kein Rücksog zum Ventilraum aufzutreten vermag, dann jedenfalls nicht, wenn das Verdrängungsvolumen der insbesondere als Membran ausgebildeten Verdrängungswand mindestens so groß wie das Verdrängungsvolumen der insbesondere auch als Membran ausgebildeten Steuerwand ist. Das Verdrängungsvolumen des vorzugsweise aus einer hin und her anzutreibenden Fördermembran bestehenden Pumporgans ist in jedem Falle größer als das der Steuermembran, vorzugsweise größer als deren doppeltes Verdrängungsvolumen.According to a further feature of the invention, a movable displacement wall, the volume of which changes in the opposite direction to the control wall and is under pretension, is provided in the valve chamber. This can ensure that during the respective suction stroke of the pumping goose and the associated suction movement of the control wall and the opening of the ventilation and bypass valve caused by the latter, no back-suction to the valve chamber can occur, at least not if the displacement volume, especially as Membrane formed displacement wall is at least as large as the displacement volume of the control wall, in particular also designed as a membrane. The displacement volume of the pumping gans, which preferably consists of a conveying membrane to be driven back and forth, is in any case larger than that of the control membrane, preferably larger than its double displacement volume.

Die Steuermembran nebst Mittelventil und das Entlüftungsventil einerseits sowie das Druckventil und die Verdrängungsmembran andererseits sind im Ventilraum sich jeweils gegenüberliegend unten und oben bzw. links und rechts davon angeordnet. Dabei ist das Mittelventil vorzugsweise in die Steuermembran integriert. Letztere kann dazu mittig mit einer die Ventilbohrung und den Ventilsitz des Mittelventils aufweisenden Ventilbüchse und einer damit verschraubten Tragbüchse für den damit über einzelne Tragarme verbundenen Ventilkörper des Entlüftungsventils versehen sein.The control membrane along with the middle valve and the vent valve on the one hand and the pressure valve and the displacement membrane on the other hand are arranged opposite each other in the valve space below and above or to the left and right thereof. The center valve is preferably integrated in the control membrane. For this purpose, the latter can be provided in the center with a valve bushing which has the valve bore and the valve seat of the central valve and a support bush which is screwed thereto for the valve body of the venting valve connected thereto via individual support arms.

Wie die Praxis gezeigt hat, ist es von Vorteil, wenn an dem insbesondere als Kugel ausgebildeten Ventilkörper des zum Dosierleitungsanschluß führenden Druckventils eine die Ventilkugel etwa unter 1 bar Vorspannung setzende Druckfeder und an der Ausgleichsmembran eine sie unter etwa 0,5 bar setzende Druckfeder angreifen. Hierdurch ergibt sich nach hinreichender Entlüftung des Ventilraums durch entsprechend mehrere Saug- und Druckhübe der Membranpumpe ein günstiger Druckaufbau im Ventilraum, der letztlich dazu führt, daß die Verdrängungsmembran entgegen der sie unter Vorspannung haltenden Feder auf Anschlag gedrückt und das Druckventil beim jeweiligen Druckhub der Fördermembran geöffnet wird, wohingegen bei jedem Saughub der Fördermembran nur eine vergleichsweise geringe Bypassmenge, die aus der Differenz der Verdrängungsvolumina der Verdrängungswand und der Steuermembran resultiert, über das sich dann jeweils öffnende Entlüftungs- und Bypass-Ventil und die Rückleitung zum Ansaugbehälter zurückgedrückt wird.As practice has shown, it is advantageous if, on the valve body, in particular a ball, of the pressure valve leading to the metering line connection, a pressure spring which places the valve ball at about 1 bar pretension and on the compensating diaphragm a pressure spring which sets it at about 0.5 bar. This results in a sufficient venting of the valve chamber by correspondingly several suction and pressure strokes of the diaphragm pump, a favorable pressure build-up in the valve chamber, which ultimately leads to the displacement diaphragm being pressed against the stop against the spring holding it under tension and the pressure valve during the respective pressure stroke of the delivery diaphragm is opened, whereas with each suction stroke of the delivery membrane only a comparatively small amount of bypass, which results from the difference between the displacement volumes of the displacement wall and the control membrane, is then pushed back via the respectively opening ventilation and bypass valve and the return line to the suction tank.

In der Zeichnung ist ein vorteilhaftes Ausführungsbeispiel einer erfindungsgemäß beschaffenen Dosierpumpe in senkrechter Einbaustellung im Schnitt dargestellt, wobei deren wichtigste Funktionselemente in

Fig.1
in der Saugstellung und in
Fig.2
in der Druckstellung wiedergegeben sind.
In the drawing, an advantageous exemplary embodiment of a metering pump designed according to the invention is shown in section in the vertical installation position, the most important functional elements of which are shown in FIG
Fig. 1
in the suction position and in
Fig. 2
are reproduced in the print position.

Die abgebildete Dosierpumpe ist mit einem Grundgehäusekörper 1 und einem damit über einen Zwischenkörper 2 schraubverbundenen Ventilgehäuse 3 versehen, in dem sich der Ventilraum 4 befindet.The metering pump shown is provided with a basic housing body 1 and a valve housing 3 which is screw-connected to it via an intermediate body 2 and in which the valve chamber 4 is located.

Im Grundgehäuse 1 liegt die Pumpenkammer 5 mit dem darin vorhandenen Pumporgan 6, das im wesentlichen aus einer im Sinne der eingezeichneten Pfeilrichtungen hin und her anzutreibenden Fördermembran 7 besteht. Der dazu notwendige Antriebsmotor ist nicht dargestellt. Im unteren Teil der Pumpenkammer 5 ist das Saugventil 8 vorgesehen, dessen als Ventilkugel 8' ausgebildeter Ventilkörper auf der im Anschlußstutzen 9 gelegenen Sitzdichtung 10 aufliegt bzw. durch die Druckfeder 8" dagegen gedrückt wird. An den Stutzen 9 ist die von einem die Dosierflüssigkeit enthaltenden Ansaugbehälter kommende Ansaugleitung anzuschließen.The pump chamber 5 is located in the basic housing 1 with the pump element 6 present therein, which essentially consists of a delivery membrane 7 to be driven back and forth in the direction of the arrows. The drive motor required for this is not shown. In the lower part of the pump chamber 5, the suction valve 8 is provided, the valve body of which, designed as a valve ball 8 ', rests on the seat seal 10 located in the connecting piece 9 or is pressed against it by the compression spring 8 " Suction tank to connect incoming suction line.

Die Pumpenkammer 5 ist über die den Zwischenkörper 2 durchdringende Mittelbohrung 11 und das generell mit 12 bezeichnete Rückschlag-Mittelventil mit dem Ventilraum 4 zu verbinden bzw. in der Schließstellung des Mittelventils davon zu trennen. Dazu dient auch die zwischen dem Zwischenkörper 2 und dem unteren Teil des Ventilgehäusekörpers 3 eingebaute, hier als Membran ausgebildete Steuerwand 13, in die das Rückschlag-Mittelventil 12 integriert ist. Die Steuermembran 13 ist dazu mittig mit einer die Ventilbohrung 14 und den Ventilsitz 15 bildenden Ventilbüchse 16 versehen, die über an ihr unten vorhandene Arme 16' auf dem Zwischenkörper 2 so aufliegt, daß die Steuermembran 13 stets vollständig von dem in der Mittelbohrung 11 vorhandenen Flüssigkeitsdruck beaufschlagt wird. Im etwas größeren Durchmesser aufweisenden oberen Teil der Mittelbohrung 11 ist eine Druckfeder 17 angeordnet, die die Steuerwand bzw. -membran 13 in Richtung zum Ventilraum 4 hin beaufschlagt. Die Ventilbüchse 16 ist unter Einspannung der inneren Partien der Steuermembran 13 mit der Tragbüchse 18 verschraubt, auf der sich Tragarme 18' befinden, die die Steuermembran 13 bzw. deren Tragbüchse 18 mit dem Ventilkörper 19 des generell mit 20 bezeichneten Entlüftungs- und Bypass-Ventils verbinden. Der Ventilkörper 19 ist dazu mit seinem unteren Ende zwischen die oberen Enden der Tragarme 18' widerhakenartig eingeklipst. Er wird darin zusätzlich durch die sich an ihm unterseitig abstützende Druckfeder 12" gehalten, die die Ventilkugel 12' des Mittelventils 12 gegen deren Ventilsitz 15 drückt. Die Druckfeder 12" und die Ventilkugel 12' sind in dem zwischen den Tragarmen 18' liegenden Raum untergebracht, der über die zwischen den Tragarmen 18' vorhandenen Zwischenräume mit dem eigentlichen Ventilraum 4 in ständiger Verbindung steht bzw. dazu gehört. Die Druckfeder 12" dient zur Sicherstellung der Ventilfunktion. Sie kann aber auch entfallen, wenn die Ventilkugel 12' unter ihrem Eigengewicht in Schließstellung gehalten wird.The pump chamber 5 is to be connected to the valve chamber 4 via the center bore 11 penetrating the intermediate body 2 and the non-return center valve generally designated 12 or to be separated therefrom in the closed position of the center valve. The control wall 13, which is constructed here as a membrane and is built in between the intermediate body 2 and the lower part of the valve housing body 3 and into which the non-return central valve 12 is integrated, also serves this purpose. The control membrane 13 is for this provided in the center with a valve sleeve 16 forming the valve bore 14 and the valve seat 15, which rests on the intermediate body 2 via arms 16 ′ present on it at the bottom such that the control diaphragm 13 is always completely acted upon by the liquid pressure present in the central bore 11. In the somewhat larger diameter upper part of the center bore 11, a compression spring 17 is arranged which acts on the control wall or membrane 13 in the direction of the valve chamber 4. The valve sleeve 16 is screwed under clamping of the inner parts of the control membrane 13 to the support sleeve 18, on which there are support arms 18 'which hold the control membrane 13 or its support sleeve 18 with the valve body 19 of the ventilation and bypass valve, generally designated 20 connect. The valve body 19 is clipped with its lower end between the upper ends of the support arms 18 'like a barb. It is additionally held in it by the pressure spring 12 ″, which is supported on the underside of it and presses the valve ball 12 ′ of the central valve 12 against its valve seat 15. The pressure spring 12 ″ and the valve ball 12 ′ are accommodated in the space lying between the support arms 18 ′ which is in constant communication with the actual valve chamber 4 via the gaps between the support arms 18 'or belongs to it. The compression spring 12 "serves to ensure the valve function. However, it can also be omitted if the valve ball 12 'is held in its closed position under its own weight.

In dem Ventilgehäuse 3 ist oben die Anschlußbohrung 21 für eine zum nicht dargestellten Ansaugbehälter führende Rückleitung vorhanden. In den im Durchmesser kleineren Bohrungsabschnitt 21' greift der Ventilkörper 19 mit seinem oberen etwa kreuzförmig profilierten Führungsvorsprung 19'. Auf dem Ventilkörper 19 sitzt noch der Dichtungsring 19", der mit der die Ventilsitzfläche bildenden Wandung des im Durchmesser kleineren Bohrungsabschnitts 21' zusammenwirkt.In the valve housing 3 there is the connection hole 21 for a return line leading to the suction tank, not shown. The valve body 19 engages in the smaller bore section 21 'with its upper, approximately cruciform profiled guide projection 19'. On the valve body 19 there is also the sealing ring 19 ″, which cooperates with the wall of the bore section 21 ′ which has a smaller diameter and forms the valve seat surface.

Vom Ventilraum 4 zweigt oben rechts eine zum Dosierleitungsanschluß 22 führende Leitung mit dem Druckventil 23 ab, das auch als unter Vorspannung einer Druckfeder 24 stehende Ventilkugel 23'ausgebildet ist. Die Ventilkugel 23' wird durch die Feder 24 mit etwa 1 bar Vorspannungsdruck beaufschlagt.A line leading to the metering line connection 22 branches off from the valve chamber 4 with the pressure valve 23, which line is also designed as a valve ball 23 ′ which is pretensioned by a compression spring 24. The valve ball 23 'is acted upon by the spring 24 with a preload pressure of approximately 1 bar.

Auf der gegenüberliegenden Seite des Druckventils 23 ist im Ventilraum 4 schließlich noch eine unter Vorspannung der Feder 25 stehende, hier als Membran ausgebildete Verdrängungswand 26 angeordnet, die das Volumen des Ventilraums 4 jeweils gegensinnig zur Steuermembran 13 zu ändern vermag. Diese Verdrängungsmembran 26 wird durch die an ihr angreifende Druckfeder 26 mit etwa 0,5 bar Vorspannungsdruck beaufschlagt. Das Verdrängungvolumen der Verdrängungsmembran 26 ist gleich oder etwas größer als das Verdrängungsvolumen der Steuermembran 13. Der die Druckfeder 25 enthaltende Raum ist über die Entlüftungsbohrung 27 mit der Außenatmosphäre verbunden.On the opposite side of the pressure valve 23, in the valve chamber 4 there is finally a prestressing spring 25, here designed as a diaphragm, which can change the volume of the valve chamber 4 in opposite directions to the control membrane 13. This displacement membrane 26 is acted upon by the compression spring 26 acting on it with a prestressing pressure of about 0.5 bar. The displacement volume of the displacement membrane 26 is equal to or slightly larger than the displacement volume of the control membrane 13. The space containing the compression spring 25 is connected to the outside atmosphere via the vent hole 27.

Durch die Saugbewegung der Fördermembran 7 im Sinne der in Fig.l dargestellten Pfeilrichtung wird über das Saugventil 8 die Dosierflüssigkeit und etwa in ihr enthaltene Luft angesaugt, wobei durch die in der Pumpenkammer 5 auftretende Druckerniedrigung die Steuermembran 13 mit dem in ihr vorhandenen Mittelventil 12 und der Ventilkörper 19 des Entlüftungs- und Bypass-Ventils 20 entgegen der Kraft der Feder 17 nach unten gezogen werden, wobei sich das Entlüftungsventil 20 wie dargestellt öffnet. Beim anschließenden Druckhub der Fördermembran 7 wird dagegen über die sich dabei anhebende Steuermembran 13 das Entlüftungsventil 20 geschlossen, so daß sich im Ventilraum 4 der durch die Fördermembran 7 erreichbare Druck aufbaut. Bei erneutem Saugvorgang der Fördermembran 7 wird durch den entstehenden Differenzdruck zwischen der Pumpenkammer 5 und dem Ventilraum 4 die Steuermembran 13 und mit ihr der Ventilkörper 19 des Entlüftungsventils 20 wiederum nach unten gezogen, wobei über das sich öffnende Ventil 20 die im Ventilraum 4 vorhandene Luft und zunächst auch noch das durch die Fördermembran 7 verdrängte Dosiermedium über die Rückleitung in den Dosiermittelbehälter zurückgedrückt werden. Nach mehrmaligen Saug- und Drückhüben der Fördermembran 7 ist aber der Ventilraum 4 hinreichend entlüftet. In ihm hat sich ein entsprechender Druck der Dosierflüssigkeit aufgebaut, durch den schließlich die Verdrängungsmembran 26 auf Anschlag gedrückt und das Druckventil 23 entgegen seiner Druckfeder 24 geöffnet werden. Beim jeweiligen anschließenden Saughub, bei dem sich das Entlüftungsventil 20 jedes Mal öffnet, kann darüber jeweils unabhängig vom Dosiergegendruck etwa weitere in der Dosierflüssigkeit enthaltene Luft entfernt und auch eine bestimmte Bypassmenge in die Rückleitung 21 zurückgedrückt werden, und zwar jeweils dadurch, daß dabei die Verdrängungsmembran 26 sich unter dem Druck ihrer Feder 25 von ihrem Anschlag abhebt und dadurch entsprechend ihrem Verdrängungsvolumen, abzüglich des Verdrängungsvolumens der Steuermembran 13, Flüssigkeit aus dem Ventilraum 4 nach oben verdrängt. Da das Verdrängungsvolumen der Verdrängungsmembran 26 mindestens so groß, zweckmäßig aber nur wenig größer als das der Steuermembran 13 ist, kann bei geöffnetem Entlüftungs- und Bypassventil 20 darin kein Rücksog bzw. Rückstrom in den Ventilraum 4 erfolgen. Durch Ändern der Vorspannung der Druckfeder 25 kann das Verdrängungsvolumen der Verdrängungsmembran 26 verstellt werden, beispielsweise durch etwaige schraubverstellbare Ausbildung des das Federwiderlager bildenden Topfbodens 3' im Ventilgehäuse 3, wobei der Topfboden 3' dann also eine von außen zugängliche Verstellschraube bilden würde. Durch die im Saugvenmtil 8 vorhandene Druckfeder 8" wird bei anstehendem Gegendruck im Saugventil während der Bewegung der Fördermembran 7 eine genaue definierte Druckdifferenz zwischen dem Ventilraum 4 und der Pumpenkammer 5 erreicht und damit die Schaltgenauigkeit der Entlüftungsvorrichtung erhöht.By the suction movement of the delivery membrane 7 in the sense of the arrow direction shown in Fig.l, the dosing liquid and any air contained in it is sucked in via the suction valve 8, the control membrane 13 with the central valve 12 and 12 present in it through the pressure reduction occurring in the pump chamber 5 the valve body 19 of the venting and bypass valve 20 are pulled down against the force of the spring 17, the venting valve 20 opening as shown. During the subsequent pressure stroke of the delivery membrane 7, on the other hand, the venting valve 20 is closed via the control membrane 13 that is lifted, so that the pressure achievable through the delivery membrane 7 builds up in the valve chamber 4. When the delivery membrane 7 is sucked again, the resulting differential pressure between the pump chamber 5 and the valve chamber 4 causes the control membrane 13 and with it the valve body 19 of the venting valve 20 to be pulled down again, the air and the valve valve 4 opening in the valve chamber 4 First, the dosing medium displaced by the delivery membrane 7 is also pushed back into the dosing agent container via the return line. After repeated suction and pressure strokes of the delivery membrane 7, the valve chamber 4 is adequately vented. A corresponding pressure of the metering liquid has built up in it, by means of which the displacement membrane 26 is finally pressed against the stop and the pressure valve 23 is opened against its compression spring 24. During the respective subsequent suction stroke, in which the vent valve 20 opens each time, this can be done independently of the metering back pressure For example, more air contained in the dosing liquid is removed and a certain amount of bypass is pushed back into the return line 21, in each case by the fact that the displacement membrane 26 lifts up from its stop under the pressure of its spring 25 and thereby according to its displacement volume, minus the displacement volume the control membrane 13, liquid is displaced out of the valve chamber 4 upwards. Since the displacement volume of the displacement membrane 26 is at least as large, but expediently only slightly larger than that of the control membrane 13, no back-suction or back-flow into the valve chamber 4 can take place therein when the venting and bypass valve 20 is open. By changing the preload of the compression spring 25, the displacement volume of the displacement membrane 26 can be adjusted, for example by any screw-adjustable design of the pot base 3 'forming the spring abutment in the valve housing 3, the pot base 3' then thus forming an adjusting screw accessible from the outside. Due to the pressure spring 8 ″ present in the suction valve 8 ″, when counterpressure is present in the suction valve during the movement of the delivery membrane 7, a precisely defined pressure difference between the valve chamber 4 and the pump chamber 5 is achieved and thus the switching accuracy of the ventilation device is increased.

Im Rahmen der vorliegenden Erfindung sind mancherlei Abwandlungen möglich. So braucht beispielsweise das Mittelventil 12 nicht unbedingt in die Steuermembran 13 integriert zu sein. Vielmehr kann es von letzterer auch getrennt zwischen dem Ventilraum 4 und der Pumpenkammer 5 angeordnet sein. Die Steuermembran 13 ist dann als geschlossene Membran auszubilden, die aber nach wie vor die Steuerung des zum Entlüftungsventil 20 gehörenden Ventilkörpers 19 bewirkt. Weiterhin kann die Steuermembran 13 grundsätzlich auch durch einen die Steuerwand bildenden, entsprechend anzuordnenden Steuerkolben mit Nut- oder O-Ring als Dichtelement ersetzt werden. Das Gleiche gilt auch für die Verdrängungsmembran 26, an deren Stelle also auch ein entsprechend beschaffener und angeordneter Verdrängungskolben treten könnte.Various modifications are possible within the scope of the present invention. For example, the center valve 12 need not necessarily be integrated into the control membrane 13. Rather, it can also be arranged separately from the latter between the valve chamber 4 and the pump chamber 5. The control membrane 13 is then designed as a closed membrane, which, however, still controls the valve body 19 belonging to the vent valve 20. Furthermore, the control membrane 13 can in principle also be replaced by a control piston, which forms the control wall and is to be arranged accordingly, with a groove or O-ring as a sealing element. The same also applies to the displacement membrane 26, which could be replaced by an appropriately designed and arranged displacement piston.

Claims (16)

  1. A metering pump for the measured delivery of liquids comprising a suction valve (8) installed in an intake line coming from an intake container, a following pump chamber (5) comprising a pump element (6) which changes the displacement volume of the pump chamber, a pressure valve (23) leading to the metering line connector (22) and a vent and bypass valve (20) installed in a return line (21) leading to the intake container, characterized by the provision between the pressure valve (23) and the pump chamber (5) of a valve chamber (4) which is separated from the pump chamber (5) by a central nonreturn valve (12) and a displaceable control wall (13) and in which the vent valve (20) controlled by the control wall (13) is installed, the vent valve (20) opening during the suction stroke of the pump element (6) and closing during the compression stroke thereof.
  2. A metering pump as claimed in claim 1, characterized in that a movable displacement wall (26) under pressure is provided in the valve chamber (4) and changes the volume thereof in the opposite direction to the control wall (13).
  3. A metering pump as claimed in claim 1, characterized in that the control wall is in the form of a control diaphragm (13).
  4. A metering pump as claimed in claim 3, characterized in that the pump element (6) consists of a transport diaphragm (7) which is designed to be driven back and forth and of which the displacement volume is greater than that of the control diaphragm (13) and equal to or smaller than that of the displacement wall (26) likewise in the form of a diaphragm.
  5. A metering pump as claimed in claim 4, characterized in that the displacement volume of the transport diaphragm (7) is greater than twice the displacement volume of the control diaphragm (13).
  6. A metering pump as claimed in any of claims 1 to 5, characterized in that the control wall (13) together with the central valve (12) and the vent valve (20) on the one hand and the pressure valve (23) and the displacement diaphragm (26) on the other hand are oppositely arranged in the valve chamber (4) at the top and bottom thereof or on the left and right thereof.
  7. A metering pump as claimed in any of claims 1 to 6, characterized in that the central valve (12) is integrated in the control diaphragm (13).
  8. A metering pump as claimed in 7, characterized in that the control diaphragm (13) is centrally provided with a valve sleeve (16) comprising the valve bore (14) and the valve seat (15) of the central valve (12) and with a support sleeve (18) - screwed to the valve sleeve - for the valve body (19) of the vent valve (20) which is connected to the support sleeve (18) by individual support arms (18').
  9. A metering pump as claimed in claim 8, characterized in that the valve body - in the form of a ball (12') - of the central valve (12) and a compression spring (12'') acting on the valve body are accommodated between the support arms (8') of the support sleeve (18).
  10. A metering pump as claimed in claim 9, characterized in that the valve body (19) is engaged like a barb between the upper ends of the support arms (8') and is supported underneath by the compression spring (12'') acting on the ball (12') of the central valve (12).
  11. A metering pump as claimed in any of claims 1 to 10, characterized in that a compression spring (17) acts on the control diaphragm (13) and urges it towards the valve chamber (4).
  12. A metering pump as claimed in any of claims 1 to 11, characterized in that a compression spring (24) acts on the valve body - in the form of a ball (23') - of the pressure valve (23), placing it under a pressure of about 1 bar, while a compression spring (25) acts on the displacement diaphragm (26) and places it under a pressure of about 0.5 bar.
  13. A metering pump as claimed in claim 12, characterized in that the displacement volume of the displacement diaphragm (26) is adjusted by altering the compression of the spring (25), for example by designing the spring support (3') for adjustment by screwing.
  14. A metering pump as claimed in any of claims 1 to 13, characterized in that the central nonreturn valve (12) is separated from the control diaphragm (13) and is arranged between the pump chamber (5) and the valve chamber (4).
  15. A metering pump as claimed in any of claims 1 to 14, characterized in that the valve body (8') - more particularly in the form of a ball - of the suction valve (8) is under the influence of a compression spring (8'') which seeks to press it against the valve seat (10).
  16. A metering pump as claimed in any of claims 1 to 15, characterized in that the control wall (13) and/or the displacement wall (26) is/are in the form of a control or displacement piston.
EP94901899A 1992-12-05 1993-11-27 Metering pump with vent Expired - Lifetime EP0672221B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4241030 1992-12-05
DE4241030A DE4241030C1 (en) 1992-12-05 1992-12-05 Dosing pump with vent valve
PCT/EP1993/003333 WO1994013956A1 (en) 1992-12-05 1993-11-27 Metering pump with vent

Publications (2)

Publication Number Publication Date
EP0672221A1 EP0672221A1 (en) 1995-09-20
EP0672221B1 true EP0672221B1 (en) 1996-09-18

Family

ID=6474513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94901899A Expired - Lifetime EP0672221B1 (en) 1992-12-05 1993-11-27 Metering pump with vent

Country Status (8)

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US (1) US5588809A (en)
EP (1) EP0672221B1 (en)
AT (1) ATE143101T1 (en)
CA (1) CA2151030A1 (en)
DE (2) DE4241030C1 (en)
DK (1) DK0672221T3 (en)
ES (1) ES2091686T3 (en)
WO (1) WO1994013956A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4418314C1 (en) * 1994-05-26 1996-01-04 Prominent Dosiertechnik Gmbh Liquid metering pump
DE4439962A1 (en) * 1994-11-09 1996-05-15 Lang Apparatebau Gmbh Dosing pump with venting device
DE19712096C1 (en) * 1997-03-22 1998-04-02 Lang Apparatebau Gmbh Dosing pump for conveying fluids through suction valve
IT244069Y1 (en) * 1998-06-17 2002-03-07 Ulka Srl DEVICE APPLICABLE TO VIBRATION PUMP REALIZING DIAUTOINESCO FUNCTIONS IN CONDITIONS OF COUNTER-PRESSURE COMPENSATION OF
US6139286A (en) * 1998-09-28 2000-10-31 Pulsafeeder, Inc. Automatic venting back pressure valve
NL1025793C2 (en) * 2004-03-23 2005-09-26 Bba Pompen B V Ventilation device for plunger pumps, comprises lever with closure body for sealing cylinder air collection chamber outlet and counter body resting on flexible membrane
DE102012102088A1 (en) * 2012-03-13 2013-09-19 Prominent Dosiertechnik Gmbh Positive displacement pump with forced ventilation
FR3021713B1 (en) * 2014-05-27 2019-04-05 Milton Roy Europe HYDRAULICALLY CONTROLLED MEMBRANE PUMP COMPRISING A DEDICATED DEGASSAGE PATH
DE102014112833A1 (en) * 2014-09-05 2016-03-10 Prominent Gmbh Positive displacement pump with fluid reservoir
DE102016223898A1 (en) * 2016-12-01 2018-06-07 Henkel Ag & Co. Kgaa Diaphragm valve with displacement compensation

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GB304905A (en) * 1928-01-12 1929-01-31 Otto Siemen Improvements in or relating to pump valves
US3680985A (en) * 1970-12-28 1972-08-01 Mec O Matic The Pump
US3870436A (en) * 1974-03-18 1975-03-11 Gorman Rupp Co Air release valve for self-priming pumps
DE2803470B2 (en) * 1978-01-27 1980-06-04 Dulger, Viktor, 6900 Heidelberg Ventilation device for a liquid piston pump, in particular a metering pump
US4507054A (en) * 1982-06-28 1985-03-26 Carr-Griff, Inc. Liquid dispensing system
DE3631984C1 (en) * 1986-09-19 1987-12-17 Hans Ing Kern Dosing pump
DE3631982C1 (en) * 1986-09-19 1988-02-04 Hans Ing Kern Dosing pump
DE3827489C1 (en) * 1988-08-12 1989-10-12 Gruenbeck Wasseraufbereitung Gmbh, 8884 Hoechstaedt, De

Also Published As

Publication number Publication date
DK0672221T3 (en) 1997-03-17
DE4241030C1 (en) 1994-06-01
DE59303903D1 (en) 1996-10-24
US5588809A (en) 1996-12-31
ATE143101T1 (en) 1996-10-15
CA2151030A1 (en) 1994-06-23
ES2091686T3 (en) 1996-11-01
EP0672221A1 (en) 1995-09-20
WO1994013956A1 (en) 1994-06-23

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