EP0968370B1 - Dosing pump for dosed liquid conveyance - Google Patents

Dosing pump for dosed liquid conveyance Download PDF

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Publication number
EP0968370B1
EP0968370B1 EP98913716A EP98913716A EP0968370B1 EP 0968370 B1 EP0968370 B1 EP 0968370B1 EP 98913716 A EP98913716 A EP 98913716A EP 98913716 A EP98913716 A EP 98913716A EP 0968370 B1 EP0968370 B1 EP 0968370B1
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EP
European Patent Office
Prior art keywords
valve
membrane
pump
liquid
suction
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Expired - Lifetime
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EP98913716A
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German (de)
French (fr)
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EP0968370A1 (en
Inventor
Herbert Hunklinger
Klaus Rutz
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Ecolab Engineering GmbH
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Lang Apparatebau GmbH
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Publication of EP0968370A1 publication Critical patent/EP0968370A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06Venting

Definitions

  • the invention relates to a metering pump for metered delivery of liquids with a suction valve that enters a suction pipe coming from a suction tank is installed, with a pump chamber behind it, the displacement can be changed by means of a pumping goose, with one to the metering line leading pressure valve, one located at the top of the pump Venting device with a check valve and with one in a vent line built-in, flow-actuated ventilation and bypass valve, whose response behavior depends on the physical state of the fluid present, this valve is open in the idle state, only during the pressure stroke closes when there is liquid on the valve and has an elastic membrane.
  • Such a metering pump is known from DE 42 19 663 C2.
  • the membrane the vent valve has an opening acting as a throttle with such Diameter that the membrane is not deflected when gases flow through it will, but if liquid is applied to the membrane during the pressure stroke moved and in this way the valve outlet is closed.
  • the liquid in the pump chamber can both during of the pressure and during the suction stroke the gas contained in it to the Submit vent line.
  • the fluid when the fluid is completely deaerated it closes the membrane so that only a little liquid gets into the vent line.
  • a backflow of gases from the vent line into the pump chamber is prevented by a non-return valve, which is located behind the Membrane is arranged.
  • a small amount always flows during the venting Part of the liquid through the check valve in the vent line and to Suction tank back. After venting, it is wetted with the liquid Check valve surrounded by gas or air, the liquid gradually dries. Difficulties often arise because they are partially dry Liquid residues, especially those that tend to crystallize Liquids cause the valve member to stick to the valve seat of the Check valve.
  • the gas pressure is sufficient for a new venting process on the check valve is usually not sufficient to open the valve.
  • Another metering pump for metering liquids is from the DE 42 41 030 C1 known.
  • the pump also has a vent and Return line to the suction tank, but the vent valve is inside the Flow path from the pump chamber to the liquid outlet arranged.
  • the vent line is closed by a closing body when the fluid is vented closed, which is connected to a control membrane via support arms.
  • the vent valve is only from the pressure acting on the membrane, but not from the state of matter of the fluid present. The venting speed at this pump depends on the size of the control diaphragm.
  • the invention has for its object the susceptibility to failure of a pump significantly reduce the type mentioned.
  • This object is achieved in that the membrane with a distance arranged closing body is connected to the when the membrane is deflected Vent line closes, and that the check valve between the Membrane and the closing body is arranged.
  • the membrane is used in the Pump according to the invention not as a closing body, but only as Control for such a body.
  • its valve member e.g. B. a ball
  • vented liquid and thus closed vent line is always surrounded by liquid, so that the valve member too If the pump is operated with vented liquid for a long time, do not touch the valve seat can stick.
  • the space between the membrane and the closing body remains filled with the liquid until the non-deaerated liquid again is sucked in, the membrane returns to its rest position and thus the Closing body opens the vent line so that the gas can escape.
  • the membrane is by its own bias or alternatively or additionally held in this starting position by a spring.
  • This power Response value of the valve specified. This value is chosen so that the Diaphragm only works in the pump room when the liquid is vented.
  • a particular advantage of the metering pump according to the invention is that Particularly quick venting, since there is no control output when the fluid is not vented on the membrane is required to open the vent line. Necessary is only the relatively low control output on the check valve.
  • the dependence of the response behavior of the vent valve on the state of aggregation of the fluid present is preferably achieved in that the The membrane forms a closed surface except for a throttle bore.
  • the diameter of the bore is based on the fluid and the preload Membrane tuned so that the bore is sufficiently high Flow resistance for the liquid and the membrane during the pressure stroke is operated. The flow resistance is too low for an applied gas Lift off the membrane to reach its seat.
  • the piston pump has an intake line 12, which is not shown Suction container for the liquid to be conveyed is connected to a metering line 13 and an inner pump chamber 7 arranged between the two lines.
  • a pumping membrane that changes the volume of the pump chamber 7 is used for pumping 6 moved by a motor, not shown, in the direction of the arrows.
  • a suction valve is provided, the one as a ball formed valve member 8 by a compression spring 14 in its closed position is held.
  • a corresponding metering valve at the inlet of metering line 13 also has a valve ball 9, which is on its by a compression spring 15 Valve seat is pressed.
  • the pump chamber 7 is in the upper part of the pump with a venting device connected via a vent line 10 to the not shown Intake tank is returned.
  • the venting unit is shown on an enlarged scale in FIG. She points two valves on, a diaphragm valve and a check valve with a valve ball 2.
  • the diaphragm valve consists of a diaphragm 5 with a throttle acting bore 3.
  • the membrane serves as a control for one with it closing body 4 connected via support arms 1, which is the actual valve member forms. This is between the membrane 5 and the closing body 4 Check valve arranged.
  • the Diaphragm 5 by its bias, with a compression spring also being provided can be in the rest position and lies flat on its valve seat.
  • the ball 2 of the check valve closes the bore 3 in the membrane, but the closing body 4 is lifted from its valve seat 11 and gives the Vent line 10 free.
  • the movement of the conveyor membrane 6 to the right (FIG 1) increases the volume of the pump chamber 7, the valve ball 8 of the Intake valve stands out against the compression spring 14 from its valve seat, and Liquid, air or both is sucked into the pump chamber 7.
  • the pressure valve 9 is closed.
  • the negative pressure in the pump chamber 7 acts on the relatively large area of the membrane 5 and in the direction of the bias Membrane so that it remains in its rest position.
  • FIG. 4 shows the pressure position of the metering pump when the pump head is vented.
  • the Valve ball 8 of the intake valve is in turn closed.
  • By the bigger one Backflow of the liquid at the throttle bore 3 of the membrane 5 rises Membrane from its flat seat upwards and presses the closing body 4th against its seat 11 so that the vent line 10 is closed.
  • Corresponding the area of the membrane 5 and its path increases Volume of the pump chamber 7.
  • the valve ball 9 of the metering valve lifts from its valve seat against the Force of the compression spring 15, since now with completely deaerated liquid filled pump chamber 7 a sufficient pressure acts on the ball 9.
  • the Liquid is metered into the metering line 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Nozzles (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

A dosing pump for dosed liquid conveyance that includes a suction valve built into a suction tube coming out of a suction container, a pump chamber having a displacement volume that can be modified by means of a pumping member, a pressure valve leading to a dosing tube, a deaeration device arranged on the top end of the tube and comprising a return valve and a flow-actuated deaeration and bypass valve built into a deaeration valve having response characteristics dependent upon the state of aggregation of the liquid contained therein. The flow-activated deaeration and bypass valve is open when idle, only closing when pressure is raised in the presence of liquid in the valve, and is provided with a membrane. Faulty pump operation is substantially reduced when the membrane is connected to a remote closing member which closes the deaeration tube when the membrane is moved. A return valve is arranged between the membrane and the closing member.

Description

Die Erfindung betrifft eine Dosierpumpe zum dosierten Fördern von Flüssigkeiten mit einem Saugventil, das in eine von einem Ansaugbehälter kommende Ansaugleitung eingebaut ist, mit einer dahinter liegenden Pumpenkammer, deren Verdrängungsvolumen mittels eines Pumporgans änderbar ist, mit einem zur Dosierleitung führenden Druckventil, einer am oberen Ende der Pumpe angeordneten Entlüftungseinrichtung mit einem Rückschlagventil und mit einem in eine Entlüftungsleitung eingebauten, strömungsbetätigten Entlüftungs- und Bypaß-Ventil, dessen Ansprechverhalten vom Aggregatzustand des anliegenden Fluids abhängt, wobei dieses Ventil im Ruhezustand geöffnet ist, sich nur beim Druckhub bei am Ventil anliegender Flüssigkeit schließt und eine elastische Membran aufweist.The invention relates to a metering pump for metered delivery of liquids with a suction valve that enters a suction pipe coming from a suction tank is installed, with a pump chamber behind it, the displacement can be changed by means of a pumping goose, with one to the metering line leading pressure valve, one located at the top of the pump Venting device with a check valve and with one in a vent line built-in, flow-actuated ventilation and bypass valve, whose response behavior depends on the physical state of the fluid present, this valve is open in the idle state, only during the pressure stroke closes when there is liquid on the valve and has an elastic membrane.

Eine derartige Dosierpumpe ist aus der DE 42 19 663 C2 bekannt. Die Membran des Entlüftungsventils hat eine als Drossel wirkende Öffnung mit einem derartigen Durchmesser, daß die Membran beim Durchströmen von Gasen nicht ausgelenkt wird, aber beim Anliegen von Flüssigkeit an der Membran während des Druckhubs bewegt und auf diese Weise der Ventilausgang geschlossen wird. Auf diese Weise kann die in der Pumpenkammer befindliche Flüssigkeit sowohl während des Druck- als auch während des Saughubs das in ihr enthaltene Gas an die Entlüftungsleitung abgeben. Bei vollständig entlüfteter Flüssigkeit schließt jedoch die Membran, so daß nur wenig Flüssigkeit in die Entlüftungsleitung gelangt.Such a metering pump is known from DE 42 19 663 C2. The membrane the vent valve has an opening acting as a throttle with such Diameter that the membrane is not deflected when gases flow through it will, but if liquid is applied to the membrane during the pressure stroke moved and in this way the valve outlet is closed. To this In this way, the liquid in the pump chamber can both during of the pressure and during the suction stroke the gas contained in it to the Submit vent line. However, when the fluid is completely deaerated it closes the membrane so that only a little liquid gets into the vent line.

Ein Zurückströmen von Gasen aus der Entlüftungsleitung in die Pumpenkammer wird durch ein Rückschlagventil verhindert, welches im Entlüftungsweg hinter der Membran angeordnet ist. Während des Entlüftens strömt immer auch ein geringer Teil an Flüssigkeit über das Rückschlagventil in die Entlüftungsleitung und zum Ansaugbehälter zurück. Nach dem Entlüften ist das mit der Flüssigkeit benetzte Rückschlagventil von Gas bzw. Luft umgeben, wobei die Flüssigkeit allmählich abtrocknet. Dabei treten häufig Schwierigkeiten auf, denn diese zum Teil ausgetrockneten Flüssigkeitsreste, insbesondere bei zur Auskristallisation neigenden Flüssigkeiten, führen zu einem Festkleben des Ventilglieds am Ventilsitz des Rückschlagventils. Bei einem erneuten Entlüftungsvorgang reicht der Gasdruck am Rückschlagventil dann in der Regel nicht aus, um das Ventil zu öffnen. A backflow of gases from the vent line into the pump chamber is prevented by a non-return valve, which is located behind the Membrane is arranged. A small amount always flows during the venting Part of the liquid through the check valve in the vent line and to Suction tank back. After venting, it is wetted with the liquid Check valve surrounded by gas or air, the liquid gradually dries. Difficulties often arise because they are partially dry Liquid residues, especially those that tend to crystallize Liquids cause the valve member to stick to the valve seat of the Check valve. The gas pressure is sufficient for a new venting process on the check valve is usually not sufficient to open the valve.

Eine andere Dosierpumpe zum dosierten Fördern von Flüssigkeiten ist aus der DE 42 41 030 C1 bekannt. Die Pumpe besitzt ebenfalls eine Entlüftungs- und Rückführleitung zum Ansaugbehälter, aber das Entlüftungsventil ist innerhalb des Strömungsweges von der Pumpenkammer zum Flüssigkeitsauslaß angeordnet. Die Entlüftungsleitung wird bei entlüfteter Flüssigkeit von einem Schließkörper verschlossen, der über Tragarme mit einer Steuermembran verbunden ist. Zwischen der Steuermembran und dem Schließkörper ist ein Rückschlagventil vorgesehen, das hier "Rückschlagmittelventil" genannt wird. Das Entlüftungsventil ist nur von dem auf die Membran wirkenden Druck, nicht aber vom Aggregatzustand des anliegenden Fluids abhängig. Die Entlüftungsgeschwindigkeit bei dieser Pumpe hängt von der Größe der Steuermembran ab.Another metering pump for metering liquids is from the DE 42 41 030 C1 known. The pump also has a vent and Return line to the suction tank, but the vent valve is inside the Flow path from the pump chamber to the liquid outlet arranged. The vent line is closed by a closing body when the fluid is vented closed, which is connected to a control membrane via support arms. There is a check valve between the control membrane and the closing body provided, which is called "check valve" here. The vent valve is only from the pressure acting on the membrane, but not from the state of matter of the fluid present. The venting speed at this pump depends on the size of the control diaphragm.

Der Erfindung liegt die Aufgabe zugrunde, die Störanfälligkeit einer Pumpe der eingangs genannten Art wesentlich zu verringern.The invention has for its object the susceptibility to failure of a pump significantly reduce the type mentioned.

Diese Aufgabe wird dadurch gelöst, daß die Membran mit einem im Abstand angeordneten Schließkörper verbunden ist, der bei ausgelenkter Membran die Entlüftungsleitung verschließt, und daß das Rückschlagventil zwischen der Membran und dem Schließkörper angeordnet ist.This object is achieved in that the membrane with a distance arranged closing body is connected to the when the membrane is deflected Vent line closes, and that the check valve between the Membrane and the closing body is arranged.

Im Gegensatz zur Pumpe nach der DE 42 19 663 C2 dient die Membran bei der erfindungsgemäßen Pumpe nicht gleichzeitig als Schließkörper, sondern nur als Steuerelement für einen derartigen Körper. Im Raum zwischen der Membran und dem Schließkörper ist das Rückschlagventil angeordnet, so daß dessen Ventilglied, z. B. eine Kugel, bei entlüfteter Flüssigkeit und damit geschlossener Entlüftungsleitung immer von Flüssigkeit umgeben ist, so daß das Ventilglied auch bei längerem Betrieb der Pumpe mit entlüfteter Flüssigkeit nicht am Ventilsitz festkleben kann. Der Raum zwischen der Membran und dem Schließkörper bleibt solange mit der Flüssigkeit gefüllt, bis erneut nicht entlüftete Flüssigkeit angesaugt wird, die Membran in ihre Ruhestellung zurückgeht und damit der Schließkörper die Entlüftungsleitung öffnet, so daß das Gas entweichen kann.In contrast to the pump according to DE 42 19 663 C2, the membrane is used in the Pump according to the invention not as a closing body, but only as Control for such a body. In the space between the membrane and the check valve is arranged so that its valve member, e.g. B. a ball, with vented liquid and thus closed vent line is always surrounded by liquid, so that the valve member too If the pump is operated with vented liquid for a long time, do not touch the valve seat can stick. The space between the membrane and the closing body remains filled with the liquid until the non-deaerated liquid again is sucked in, the membrane returns to its rest position and thus the Closing body opens the vent line so that the gas can escape.

Beim Saughub im Falle von entlüfteter Flüssigkeit bewegt sich die Membran in ihre Ausgangsstellung zurück, und der Schließkörper öffnet die Entlüftungsleitung. Ein Zurückströmen von Luft oder Gasen wird in diesem Fall jedoch durch das Rückschlagventil verhindert. Die im Gegensatz zur Pumpe nach der DE 42 19 663 C2 auch bei entlüfteter Flüssigkeit stattfindende ständige Bewegung der Membran verhindert deren Festsetzen und trägt zur Funktionssicherheit bei.During the suction stroke in the case of vented liquid, the membrane moves in return to their starting position and the closing body opens the vent line. In this case, however, a backflow of air or gases is prevented by the Check valve prevented. In contrast to the pump according to DE 42 19 663 C2 Constant movement of the membrane, even with deaerated liquid prevents them from getting stuck and contributes to functional safety.

Da bei der Entlüftung und beim Druckwechsel vom Saug- zum Druckhub geringe Mengen an Flüssigkeit über die Entlüftungsleitung abfließen, ist es von Vorteil, wenn die Entlüftungsleitung zum Ansaugbehälter zurückführt.Since there is little ventilation and pressure change from suction to pressure stroke Flow of liquid through the vent line, it is advantageous to when the ventilation line leads back to the suction tank.

Die Membran wird durch ihre eigene Vorspannung oder alternativ oder zusätzlich über eine Feder in dieser Ausgangsstellung gehalten. Mit Hilfe dieser Kraft ist der Ansprechwert des Ventils vorgegeben. Dieser Wert ist so gewählt, daß die Membran nur bei entlüfteter Flüssigkeit im Pumpenraum tätig wird.The membrane is by its own bias or alternatively or additionally held in this starting position by a spring. With the help of this power Response value of the valve specified. This value is chosen so that the Diaphragm only works in the pump room when the liquid is vented.

Ein besonderer Vorteil der erfindungsgemäßen Dosierpumpe liegt in der besonders schnellen Entlüftung, da bei nicht entlüfteter Flüssigkeit keine Steuerleistung auf die Membran erforderlich ist, um die Entlüftungleitung zu öffnen. Notwendig ist nur die relativ geringe Steuerleistung auf das Rückschlagventil.A particular advantage of the metering pump according to the invention is that Particularly quick venting, since there is no control output when the fluid is not vented on the membrane is required to open the vent line. Necessary is only the relatively low control output on the check valve.

Die Abhängigkeit des Ansprechverhaltens des Entlüftungsventils vom Aggregatzustand des anliegenden Fluids wird vorzugsweise dadurch erreicht, daß die Membran bis auf eine Drosselbohrung eine geschlossene Fläche bildet. Der Durchmesser der Bohrung ist auf die Flüssigkeit und die Vorspannung der Membran abgestimmt, so daß die Bohrung einen ausreichend hohen Strömungswiderstand für die Flüssigkeit bildet und beim Druckhub die Membran betätigt wird. Für anliegendes Gas ist der Strömungswiderstand zu gering, um ein Abheben der Membran von ihrem Sitz zu erreichen.The dependence of the response behavior of the vent valve on the state of aggregation of the fluid present is preferably achieved in that the The membrane forms a closed surface except for a throttle bore. The The diameter of the bore is based on the fluid and the preload Membrane tuned so that the bore is sufficiently high Flow resistance for the liquid and the membrane during the pressure stroke is operated. The flow resistance is too low for an applied gas Lift off the membrane to reach its seat.

Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand von Zeichnungen näher beschrieben. Es zeigen

Figur 1
einen Längsschnitt durch eine erfindungsgemäße Dosierpumpe in der Saugstellung,
Figur 2
eine vergrößerte Darstellung des Entlüftungsteils der Pumpe nach Figur 1, ebenfalls in der Saugstellung,
Figur 3
die Pumpe in der Entlüftungsstellung und
Figur 4
die Pumpe in der Dosierstellung.
In the following an embodiment of the invention will be described with reference to drawings. Show it
Figure 1
2 shows a longitudinal section through a metering pump according to the invention in the suction position,
Figure 2
2 shows an enlarged view of the venting part of the pump according to FIG. 1, also in the suction position,
Figure 3
the pump in the venting position and
Figure 4
the pump in the dosing position.

In allen Zeichnungen haben gleiche Bezugszeichen die gleiche Bedeutung und werden daher gegebenenfalls nur einmal erläutert.In all drawings, the same reference numerals have the same meaning and may therefore only be explained once.

Die Kolbenpumpe hat eine Ansaugleitung 12, die mit einem nicht dargestellten Ansaugbehälter für die zu fördernde Flüssigkeit verbunden ist, eine Dosierleitung 13 und eine zwischen beide Leitungen angeordnete innere Pumpenkammer 7. Zum Pumpen wird eine das Volumen der Pumpenkammer 7 ändernde Fördermembrane 6 von einem nicht dargestellten Motor in Richtung der Pfeile bewegt. Am Einlaß der Ansaugleitung 12 ist ein Saugventil vorgesehen, dessen als Kugel ausgebildetes Ventilglied 8 von einer Druckfeder 14 in seiner Schließlage gehalten wird. Ein entsprechendes Dosierventil am Eingang der Dosierleitung 13 weist ebenfalls eine Ventilkugel 9 auf, die von einer Druckfeder 15 auf ihren Ventilsitz gepreßt wird.The piston pump has an intake line 12, which is not shown Suction container for the liquid to be conveyed is connected to a metering line 13 and an inner pump chamber 7 arranged between the two lines. A pumping membrane that changes the volume of the pump chamber 7 is used for pumping 6 moved by a motor, not shown, in the direction of the arrows. At the inlet of the suction line 12, a suction valve is provided, the one as a ball formed valve member 8 by a compression spring 14 in its closed position is held. A corresponding metering valve at the inlet of metering line 13 also has a valve ball 9, which is on its by a compression spring 15 Valve seat is pressed.

Die Pumpenkammer 7 ist im oberen Teil der Pumpe mit einer Entiüftungseinrichtung verbunden, die über eine Entlüftungsleitung 10 zu dem nicht dargestellten Ansaugbehälter zurückgeführt ist.The pump chamber 7 is in the upper part of the pump with a venting device connected via a vent line 10 to the not shown Intake tank is returned.

Die Entlüftungseinheit ist in Figur 2 im vergrößerten Maßstab dargestellt. Sie weist zwei Ventile auf, ein Membranventil und ein Rückschlagventil mit einer Ventilkugel 2. Das Membranventil besteht aus einer Membran 5 mit einer als Drossel wirkenden Durchbohrung 3. Die Membran dient als Ansteuerung für einen mit ihr über Tragarme 1 verbundenen Schließkörper 4, der das eigentliche Ventilglied bildet. Zwischen der Membran 5 und dem Schließkörper 4 ist das Rückschlagventil angeordnet.The venting unit is shown on an enlarged scale in FIG. She points two valves on, a diaphragm valve and a check valve with a valve ball 2. The diaphragm valve consists of a diaphragm 5 with a throttle acting bore 3. The membrane serves as a control for one with it closing body 4 connected via support arms 1, which is the actual valve member forms. This is between the membrane 5 and the closing body 4 Check valve arranged.

Weitere Einzelheiten werden aus der nachfolgenden Funktionsbeschreibung deutlich. Zu Beginn des Dosiervorgangs, in der Saugstellung, befindet sich die Membran 5 durch ihre Vorspannung, wobei zusätzlich auch eine Druckfeder vorgesehen sein kann, in der Ruhestellung und liegt flächig auf ihrem Ventilsitz auf. Die Kugel 2 des Rückschlagventils verschließt die Bohrung 3 in der Membran, aber der Schließkörper 4 ist von seinem Ventilsitz 11 abgehoben und gibt die Entlüftungsleitung 10 frei. Die Bewegung der Fördermembran 6 nach rechts (Figur 1) vergrößert das Volumen der Pumpenkammer 7, die Ventilkugel 8 des Ansaugventils hebt sich entgegen der Druckfeder 14 von ihrem Ventilsitz ab, und Flüssigkeit, Luft oder beides wird in die Pumpenkammer 7 gesaugt. Das Druckventil 9 ist geschlossen. Der Unterdruck in der Pumpenkammer 7 wirkt auf die relativ große Fläche der Membran 5 und in Richtung der Vorspannung der Membran, so daß diese in ihrer Ruhestellung verbleibt.Further details are given in the functional description below clear. At the beginning of the dosing process, in the suction position, the Diaphragm 5 by its bias, with a compression spring also being provided can be in the rest position and lies flat on its valve seat. The ball 2 of the check valve closes the bore 3 in the membrane, but the closing body 4 is lifted from its valve seat 11 and gives the Vent line 10 free. The movement of the conveyor membrane 6 to the right (FIG 1) increases the volume of the pump chamber 7, the valve ball 8 of the Intake valve stands out against the compression spring 14 from its valve seat, and Liquid, air or both is sucked into the pump chamber 7. The pressure valve 9 is closed. The negative pressure in the pump chamber 7 acts on the relatively large area of the membrane 5 and in the direction of the bias Membrane so that it remains in its rest position.

Beim folgenden Druckhub (Figur 3) bewegt sich die Fördermembran 6 nach links und verringert das Volumen der Pumpenkammer 7, wobei sich das Ventil 8 schließt. Infolge der in der Flüssigkeit enthaltenden Luft reicht der Druck noch nicht aus, um das Dosierventil 9 gegen die Kraft der Druckfeder 15 und des eventuell anstehenden Gegendrucks aus der Dosierleitung 13 zu öffnen. Die in der Pumpenkammer 7 enthaltende Luft strömt nach oben zur Membran 5, hebt die Ventilkugel 2 an und entweicht über den Schließkörper 4, der die Entlüftungsleitung 10 freigibt, in die Leitung 10. Die Bohrung 3 in der Membran 5 hat einen derartigen Durchmesser, so daß der durch die strömende Luft entstehende Rückstau nicht ausreicht, die Membran 5 anzuheben. Die Entlüftungsleitung ist daher während dieses Entlüftungsvorgangs dauernd geöffnet und ein Gasdruck im System, z. B. durch ausgasende Flüssigkeiten, kann nicht auftreten. Vorteilhafterweise arbeitet die Entlüftung drucklos und ohne Verlustraum ("Totraum") der Membran 5. Die Entlüftung erfolgt damit schnell und sicher.In the following pressure stroke (Figure 3), the conveyor membrane 6 moves to the left and reduces the volume of the pump chamber 7, whereby the valve 8 closes. Due to the air contained in the liquid, the pressure is still sufficient not out to the metering valve 9 against the force of the compression spring 15 and open any counterpressure from the metering line 13. In the air containing the pump chamber 7 flows up to the membrane 5, lifts the valve ball 2 on and escapes through the closing body 4, which the vent line 10 releases into the line 10. The bore 3 in the membrane 5 has one such a diameter that the air created by the flowing air Backflow is not sufficient to lift the membrane 5. The vent line is therefore constantly open during this venting process and a gas pressure in the system, e.g. B. by degassing liquids, can not occur. Advantageously the vent works without pressure and without loss ("dead space") Membrane 5. The ventilation takes place quickly and safely.

Figur 4 zeigt die Druckstellung der Dosierpumpe bei entlüftetem Pumpenkopf. Die Ventilkugel 8 des Ansaugventils ist wiederum geschlossen. Durch den größeren Rückstau der Flüssigkeit an der Drosselbohrung 3 der Membran 5 hebt sich die Membran von ihrem flächigen Sitz nach oben ab und drückt den Schließkörper 4 gegen seinen Sitz 11, so daß die Entlüftungsleitung 10 verschlossen ist. Entsprechend der Fläche der Membran 5 und ihrem Weg vergrößert sich das Volumen der Pumpenkammer 7. Nach dem Verschließen der Entlüftungsleitung 10 hebt sich die Ventilkugel 9 des Dosierventils von ihrem Ventilsitz gegen die Kraft der Druckfeder 15 ab, da nun bei vollständig mit entlüfteter Flüssigkeit gefülltem Pumpenraum 7 ein ausreichender Druck auf die Kugel 9 einwirkt. Die Flüssigkeit wird in die Dosierieitung 13 eindosiert.Figure 4 shows the pressure position of the metering pump when the pump head is vented. The Valve ball 8 of the intake valve is in turn closed. By the bigger one Backflow of the liquid at the throttle bore 3 of the membrane 5 rises Membrane from its flat seat upwards and presses the closing body 4th against its seat 11 so that the vent line 10 is closed. Corresponding the area of the membrane 5 and its path increases Volume of the pump chamber 7. After closing the vent line 10 the valve ball 9 of the metering valve lifts from its valve seat against the Force of the compression spring 15, since now with completely deaerated liquid filled pump chamber 7 a sufficient pressure acts on the ball 9. The Liquid is metered into the metering line 13.

Beim anschließenden Saughub bewegt sich die Membran 5 bei geschlossenem Rückschlagventil nach unten und verkleinert das Volumen der Pumpenkammer 7. Eine Verlustleistung durch die Entlüftungseinrichtung tritt daher nur im entlüfteten Zustand auf. Bei in der Pumpenkammer 7 vorhandenem Gas kommt es dagegen zu einer Art selbststeigerndem Effekt für die Ansaugleistung. Wichtig ist auch die relativ große Membranfläche, an der die Kräfte angreifen, um das Festkleben des Schließkörpers 4 am Sitz 11 zu verhindern. During the subsequent suction stroke, the membrane 5 moves when the valve is closed Check valve down and reduces the volume of the pump chamber 7. A power loss through the venting device therefore occurs only in the vented Condition on. With gas present in the pump chamber 7, however, this occurs to a kind of self-increasing effect for the suction power. That is also important relatively large membrane area on which the forces act in order to stick the To prevent closing body 4 on the seat 11.

BezugszeichenlisteReference list

11
TragarmBeam
22nd
VentilkugelValve ball
33rd
Bohrungdrilling
44th
SchließkörperClosing body
55
Membranmembrane
66
Fördermembran (Pumporgan)Conveying membrane (pump pump)
77
PumpenkammerPump chamber
88th
Ventilglied des AnsaugventilsValve element of the intake valve
99
Ventilkugel des DosierventilsValve ball of the metering valve
1010th
EntlüftungsleitungVent line
1111
VentilsitzValve seat
1212th
AnsaugleitungSuction pipe
1313
DosierleitungDosing line
1414
DruckfederCompression spring
1515
DruckfederCompression spring

Claims (5)

  1. A feed pump for conveying liquids in dosed amounts comprising a suction valve (8) built into an intake line (12) coming from an intake container; a pump chamber (7) behind the suction valve of which the displacement volume can be changed by a pumping element (6); a pressure valve (9) leading to the feed line (13), a venting device with a nonretum valve (2) arranged at the upper end of the pump; and a flow-actuated vent and bypass valve (1,4,5) which is built into a vent line (10) and of which the response behavior depends on the aggregate state of the fluid bearing against it, this valve (1,5) being opened in the inoperative position and closed only during the compression stroke when liquid is bearing against the valve and comprising an elastic membrane (5), characterized in that the membrane (5) is connected to a closure element (4) which is arranged at a distance therefrom and which closes the vent line (10) when the membrane (5) is deflected and in that the nonretum valve (2) is arranged between the membrane (5) and the closure element (4).
  2. A feed pump as claimed in claim 1, characterized in that the vent line (10) retums to the intake container.
  3. A feed pump as claimed in any of the preceding claims, characterized in that the membrane is biased in its rest position.
  4. A feed pump as claimed in any of the preceding claims, characterized in that the membrane is held in its rest position by a spring.
  5. A feed pump as claimed in any of the preceding claims, characterized in that the membrane forms a continuous surface except for a flow-restricting bore.
EP98913716A 1997-03-22 1998-03-13 Dosing pump for dosed liquid conveyance Expired - Lifetime EP0968370B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19712096 1997-03-22
DE19712096A DE19712096C1 (en) 1997-03-22 1997-03-22 Dosing pump for conveying fluids through suction valve
PCT/EP1998/001458 WO1998042983A1 (en) 1997-03-22 1998-03-13 Dosing pump for dosed liquid conveyance

Publications (2)

Publication Number Publication Date
EP0968370A1 EP0968370A1 (en) 2000-01-05
EP0968370B1 true EP0968370B1 (en) 2001-12-19

Family

ID=7824306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98913716A Expired - Lifetime EP0968370B1 (en) 1997-03-22 1998-03-13 Dosing pump for dosed liquid conveyance

Country Status (6)

Country Link
US (1) US6168390B1 (en)
EP (1) EP0968370B1 (en)
AT (1) ATE211221T1 (en)
DE (2) DE19712096C1 (en)
NO (1) NO994581L (en)
WO (1) WO1998042983A1 (en)

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US8968237B2 (en) 2009-01-19 2015-03-03 Mitsubishi Gas Chemical Company, Inc. Method for injecting drug into living body by electrospraying and device thereof
EP4095224A1 (en) * 2021-05-26 2022-11-30 LANXESS Deutschland GmbH Method and device for preserving beverages with pump ventilation

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DE10044609B4 (en) * 2000-09-09 2004-11-04 Siemens Ag Fuel delivery unit
US6568926B1 (en) * 2001-10-31 2003-05-27 The Gorman-Rupp Company Fluid metering pump
US7140847B2 (en) * 2004-08-11 2006-11-28 The Boc Group, Inc. Integrated high vacuum pumping system
DE102012102088A1 (en) * 2012-03-13 2013-09-19 Prominent Dosiertechnik Gmbh Positive displacement pump with forced ventilation
DE102014112833A1 (en) * 2014-09-05 2016-03-10 Prominent Gmbh Positive displacement pump with fluid reservoir
JP2018518632A (en) * 2015-06-22 2018-07-12 セコ エス.ピー.エイ. Bleed valve and self-bleed pump with such a valve
CN105221380A (en) * 2015-09-29 2016-01-06 苏州巧泰精密机械有限公司 Metering pump
DE102017121274B3 (en) * 2017-09-14 2019-02-21 Wollin Gmbh Spray nozzle for a spray tool
DE102018133214A1 (en) 2018-12-20 2020-06-25 Lutz-Jesco Gmbh Dosing pump with integrated overflow valve and valve insert for a dosing pump
EP4387466A1 (en) 2021-11-04 2024-06-26 LANXESS Deutschland GmbH Device and method for feeding a preservative into a beverage with pressure sensors

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GB2177183B (en) * 1985-07-05 1989-07-19 Mpl Pumps Limited Valve
DE3631984C1 (en) * 1986-09-19 1987-12-17 Hans Ing Kern Dosing pump
DE3827489C1 (en) * 1988-08-12 1989-10-12 Gruenbeck Wasseraufbereitung Gmbh, 8884 Hoechstaedt, De
US4951701A (en) * 1989-07-17 1990-08-28 Vernay Laboratories, Inc. Combination air vent and overpressure valve
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DE4439962A1 (en) * 1994-11-09 1996-05-15 Lang Apparatebau Gmbh Dosing pump with venting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8968237B2 (en) 2009-01-19 2015-03-03 Mitsubishi Gas Chemical Company, Inc. Method for injecting drug into living body by electrospraying and device thereof
EP4095224A1 (en) * 2021-05-26 2022-11-30 LANXESS Deutschland GmbH Method and device for preserving beverages with pump ventilation
WO2022248514A1 (en) * 2021-05-26 2022-12-01 Lanxess Deutschland Gmbh Method and device for preserving beverages, having a pump ventilation

Also Published As

Publication number Publication date
NO994581D0 (en) 1999-09-21
DE19712096C1 (en) 1998-04-02
DE59802532D1 (en) 2002-01-31
NO994581L (en) 1999-09-21
US6168390B1 (en) 2001-01-02
ATE211221T1 (en) 2002-01-15
WO1998042983A1 (en) 1998-10-01
EP0968370A1 (en) 2000-01-05

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