EP3670905B1 - Delivery unit and method for metering highly viscous or critical media under ambient conditions - Google Patents

Delivery unit and method for metering highly viscous or critical media under ambient conditions Download PDF

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Publication number
EP3670905B1
EP3670905B1 EP19205808.9A EP19205808A EP3670905B1 EP 3670905 B1 EP3670905 B1 EP 3670905B1 EP 19205808 A EP19205808 A EP 19205808A EP 3670905 B1 EP3670905 B1 EP 3670905B1
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EP
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Prior art keywords
metering
pump
head
peristaltic pump
metering head
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EP19205808.9A
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German (de)
French (fr)
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EP3670905A1 (en
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Steffen Roth
Peter Bernard Militzer
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Lutz-Jesco GmbH
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Lutz-Jesco 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
    • 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
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action

Definitions

  • the present invention relates to a delivery unit and a method for dosing highly viscous or outgassing or critical media under ambient conditions, comprising a dosing pump with a dosing head for the quantity-defined delivery of medium introduced into the dosing head into a discharge line of the dosing pump, the dosing head being connected to the discharge line of a peristaltic pump on the inlet side Filling of the dosing head is connected, while a feed line of the peristaltic pump is connected to a media container.
  • Such a conveyor unit is already from the EP 1 637 735 A1 previously known. In general, such conveyor units are widely known in the prior art.
  • the dosing head itself can also be modified and, depending on the type of medium, provided with a heater to lower the viscosity of the medium in the dosing head, an enlarged nominal diameter on the suction valve or with a venting device for releasing gas bubbles from the sucked in medium.
  • the present invention is based on the object of proposing a delivery unit that prevents cavitation from occurring even in the case of highly viscous media or media that are outgassing under ambient conditions or critical media and enables precise metering.
  • a metering pump of conventional design which is preferably operated with a membrane.
  • the dosing head of such a dosing pump is supplied with a medium via an inlet line, the dosing head sucking in the medium via the inlet line.
  • the feed line is preceded by a peristaltic pump which, in addition to the suction power of the metering pump itself, conveys the medium in the direction of the metering pump.
  • the feed line is wrapped more or less around a rotor, which clamps the feed line by means of opposing rollers or sliding blocks.
  • a rotor By turning the rotor, the contents of the feed line are conveyed between the rollers or sliding blocks in the direction of rotation.
  • the inlet line of the hose pump and the outlet line of the hose pump merge, since the hose pump is not built between two lines but around a continuous line. With a direct connection to the dosing head of the dosing pump, the same line continues to act as the feed line of the dosing pump. However, due to the way the hose pump works, it is always the same line.
  • the dosing pump can now ensure consistently exact dosing without providing an additional heating device or ventilation.
  • Such a peristaltic pump can also be assigned to the metering pump as a unit, in such a way that the feed line can be passed through the peristaltic pump if required when the critical media mentioned at the beginning are to be conveyed.
  • the hose pump can with some advantage be designed so that a first delivery volume flow generated by it is at least as large as a second delivery volume flow generated by the dosing pump.
  • the dosing pump moves to an open end position after the contents of the dosing head have been conveyed out, signals this end position, preferably via a position sensor, to the hose pump, which in turn then begins to fill the dosing head, unless this is already done by the suction of the dosing pump itself is.
  • a pressure sensor it can also be recorded when the medium is present in sufficient quantities in the dosing head so that the next delivery cycle of the dosing pump can then begin.
  • a compensating tank can be provided between the hose pump and the metering pump, which can be filled via the hose pump and from which the metering pump pumps out by its own suction.
  • the heating, venting and geodetically increased storage could not be applied to the metering pump or the media container, but it would be sufficient to provide the compensation tank in this way.
  • the suction effect of the metering pump could again be improved by arranging an overpressure pump in the equalization tank.
  • Figure 1 shows a delivery unit 1, which is composed of a metering pump 2 and a hose pump 6.
  • the metering pump is fed with a viscous medium 11 from a media container 10 via an inlet line 4 is inserted, whereby it is divided into an inlet line 7 of the hose pump and a drain line 8 of the hose pump.
  • a free end of the supply line 7 dips into the media container 10, so that the hose pump 6 sucks in medium 11 from the media container 10 in a manner known per se.
  • the peristaltic pump 6 fills the dosing head 3 of the dosing pump 2, which in turn, due to its reliable filling, is able to dose evenly via a discharge line 8 into a downstream process 12.
  • the peristaltic pump 6 can work continuously and ensure that a constant medium pressure is always applied to a suction side of the dosing head 3. For this purpose, it is particularly necessary that a delivery volume flow generated by the hose pump 6 is greater than a delivery volume flow generated by the metering pump 2 in the direction of the process 12.
  • a membrane in the dosing head 3 it is also possible to electrically detect the position of a membrane in the dosing head 3 by means of a position sensor and to transmit this signal to the hose pump 6.
  • the peristaltic pump 6 is switched on and pumps medium into the dosing head 3 until a pressure sensor detects that the dosing head, and therefore the Dosing chamber is completely filled.
  • the hose pump 6 is stopped and the dosing pump 2 conveys the medium 11 contained in the dosing head 3 via the drain line 5 into the process 12.
  • the membrane then moves back to the end position and the process is repeated again.
  • Figure 2 shows a variant of the embodiment of the delivery unit just described, in which the peristaltic pump 6 does not deliver directly into the dosing head 3, but rather into a compensation vessel 9 which is geodetically supported above the dosing head 3. While the peristaltic pump 6 enables a uniform inflow into the equalization vessel 9, a positive inflow from the equalization vessel into the dosing head 3 takes place, which can still be supported by an overpressure pump in the compensation tank 9.
  • the compensation tank 9 can also be assigned a heater with which the medium 11 is heated so that it can be conveyed into the metering pump 2 with a lower viscosity.
  • a delivery unit is thus described above in which the dosing head of a dosing pump is filled with the aid of an upstream peristaltic pump and which thus prevents cavitation from occurring and enables precise dosing even with highly viscous media or media that are outgassing under ambient conditions or critical media.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Description

Die vorliegende Erfindung betrifft eine Fördereinheit und ein Verfahren zum Dosieren hochviskoser oder unter Umgebungsbedingungen ausgasender oder kritischer Medien, umfassend eine Dosierpumpe mit einem Dosierkopf zum mengendefinierten Fördern in den Dosierkopf eingebrachten Mediums in eine Ablaufleitung der Dosierpumpe, wobei der Dosierkopf zulaufseitig mit der Ablaufleitung einer Schlauchpumpe zur Befüllung des Dosierkopfs verbunden ist, während eine Zulaufleitung der Schlauchpumpe mit einem Medienbehälter verbunden ist.The present invention relates to a delivery unit and a method for dosing highly viscous or outgassing or critical media under ambient conditions, comprising a dosing pump with a dosing head for the quantity-defined delivery of medium introduced into the dosing head into a discharge line of the dosing pump, the dosing head being connected to the discharge line of a peristaltic pump on the inlet side Filling of the dosing head is connected, while a feed line of the peristaltic pump is connected to a media container.

Eine derartige Fördereinheit ist bereits aus der EP 1 637 735 A1 vorbekannt. Allgemein sind derartige Fördereinheiten im Stand der Technik vielfältig bekannt. In diesem Zusammenhang bestehen beim Ansaugen mithilfe von membrangetriebenen Dosierpumpen regelmäßig Probleme mit bestimmten Medien. Dazu gehören insbesondere hochviskose Medien, Medien im Bereich des kritischen Punkts oder auch solche Medien, die aus ihrer Natur heraus zum Ausgasen neigen, also aufgrund ihrer Zusammensetzung teilweise bereits bei Umgebungsdruck den Aggregatzustand ändern. Es kann dazu kommen, dass der Dosierkopf in einem Ansaugzyklus nich komplett gefüllt wird, so dass eine undefinierte Menge dosiert wird. Dies ist bei einer Dosierpumpe natürlich nicht hinnehmbar.Such a conveyor unit is already from the EP 1 637 735 A1 previously known. In general, such conveyor units are widely known in the prior art. In this context, there are regular problems with certain media when priming with the aid of diaphragm-driven metering pumps. These include, in particular, highly viscous media, media in the area of the critical point or also those media which by their nature tend to outgassing, i.e. due to their composition sometimes change their state of aggregation at ambient pressure. It can happen that the dosing head is not completely filled in one suction cycle, so that a undefined amount is dosed. Of course, this is not acceptable with a metering pump.

Neben der Problematik der ungenauen Dosierung erhöht sich auch der Verschleiß an der Dosierpumpe durch Kavitation im Dosierkopf, was diesen sowie die hydraulischen Komponenten der Dosierpumpe auf Dauer beschädigt.In addition to the problem of imprecise dosing, wear and tear on the dosing pump also increases due to cavitation in the dosing head, which permanently damages it and the hydraulic components of the dosing pump.

Der Stand der Technik bietet hierfür bereits einige Lösungsansätze an. So kann zunächst für einen positiven Zulauf gesorgt werden, also das Medium geodätisch oberhalb der Pumpe gelagert werden, so dass die hierdurch auf das Medium wirkende Schwerkraft die Ansaugung in den Dosierkopf zusätzlich unterstützt.The state of the art already offers some possible solutions for this. In this way, a positive inflow can initially be ensured, i.e. the medium can be stored geodetically above the pump, so that the force of gravity acting on the medium additionally supports the suction into the dosing head.

Auch kann der Dosierkopf selbst modifiziert werden und je nach Art des Mediums etwa mit einer Heizung zur Senkung der Viskosität des Mediums im Dosierkopf, einer vergrößerten Nennweite am Saugventil oder auch mit einer Entlüftungseinrichtung zum Ablassen von Gasblasen aus dem angesaugten Medium, versehen werden.The dosing head itself can also be modified and, depending on the type of medium, provided with a heater to lower the viscosity of the medium in the dosing head, an enlarged nominal diameter on the suction valve or with a venting device for releasing gas bubbles from the sucked in medium.

All diese Möglichkeiten reduzieren die genannten Probleme zwar, beseitigen diese aber nicht vollständig und sind mit einem großen Montageaufwand und nennenswerten Kosten verbunden.All of these possibilities reduce the problems mentioned, but do not completely eliminate them and are associated with a great deal of assembly effort and considerable costs.

Vor diesem Hintergrund liegt der vorliegenden Erfindung die Aufgabe zu Grunde, eine Fördereinheit vorzuschlagen, die auch bei hochviskosen oder unter Umgebungsbedingungen ausgasenden oder kritischen Medien das Auftreten von Kavitation verhindert und eine exakte Dosierung ermöglicht.Against this background, the present invention is based on the object of proposing a delivery unit that prevents cavitation from occurring even in the case of highly viscous media or media that are outgassing under ambient conditions or critical media and enables precise metering.

Gelöst wird diese Aufgabe durch eine Fördereinheit zum Dosieren hochviskoser oder unter Umgebungsbedingungen ausgasender oder kritischer Medien gemäß den Merkmalen des unabhängigen Anspruchs 1. Weiter wird die Aufgabe gelöst durch ein solches Verfahren gemäß den Merkmalen der nebengeordneten unabhängigen Ansprüche 5 und 8. Weitere sinnvolle Ausgestaltungen sowohl der Fördereinheit als auch des Verfahrens können den sich jeweils anschließenden abhängigen Ansprüchen entnommen werden.This object is achieved by a delivery unit for dosing highly viscous media or media that are outgassing under ambient conditions or critical media according to the features of independent claim 1. The object is also achieved by such a method according to the features of FIG secondary independent claims 5 and 8. Further sensible refinements of both the delivery unit and the method can be found in the respective subsequent dependent claims.

Erfindungsgemäß ist es vorgesehen, eine Dosierpumpe herkömmlicher Bauart zu verwenden, welche vorzugsweise mit einer Membran betrieben wird. Wie aus dem Stand der Technik bekannt, wird der Dosierkopf einer solchen Dosierpumpe über eine Zulaufleitung mit einem Medium versorgt, wobei der Dosierkopf das Medium über die Zulaufleitung ansaugt. Jedoch ist der Zulaufleitung eine Schlauchpumpe vorangeschaltet, welche zusätzlich zu der Saugleistung der Dosierpumpe selbst das Medium in Richtung der Dosierpumpe fördert.According to the invention it is provided to use a metering pump of conventional design, which is preferably operated with a membrane. As is known from the prior art, the dosing head of such a dosing pump is supplied with a medium via an inlet line, the dosing head sucking in the medium via the inlet line. However, the feed line is preceded by a peristaltic pump which, in addition to the suction power of the metering pump itself, conveys the medium in the direction of the metering pump.

In einer Schlauchpumpe wird die Zulaufleitung mehr oder minder um einen Rotor herumgelegt, welcher über einander gegenüberliegende Rollen oder Gleitschuhe die Zulaufleitung abklemmt. Durch eine Drehung des Rotors wird der Inhalt der Zulaufleitung zwischen den Rollen oder Gleitschuhen in Drehrichtung weitergefördert. Eine solche Lösung erlaubt eine zuverlässige Förderung auch von hochviskosen oder unter Umgebungsbedingungen ausgasenden oder kritischen Medien und schafft es dadurch, bei entsprechender Auslegung das Medium kontinuierlich in den Dosierkopf der Dosierpumpe hineinzufördern.In a peristaltic pump, the feed line is wrapped more or less around a rotor, which clamps the feed line by means of opposing rollers or sliding blocks. By turning the rotor, the contents of the feed line are conveyed between the rollers or sliding blocks in the direction of rotation. Such a solution allows a reliable delivery even of highly viscous media or media that are outgassing under ambient conditions or critical media and, with an appropriate design, makes it possible to continuously feed the media into the dosing head of the dosing pump.

Begrifflich gehen die Zulaufleitung der Schlauchpumpe und die Ablaufleitung der Schlauchpumpe ineinander über, da die Schlauchpumpe nicht zwischen zwei Leitungen, sondern um eine durchgehende Leitung herum aufgebaut ist. Bei einem direkten Anschluss an den Dosierkopf der Dosierpumpe wirkt die gleiche Leitung weiter als Zulaufleitung der Dosierpumpe. Es handelt sich jedoch aufgrund der Funktionsweise der Schlauchpumpe stets um dieselbe Leitung.Conceptually, the inlet line of the hose pump and the outlet line of the hose pump merge, since the hose pump is not built between two lines but around a continuous line. With a direct connection to the dosing head of the dosing pump, the same line continues to act as the feed line of the dosing pump. However, due to the way the hose pump works, it is always the same line.

Dadurch, dass der Dosierkopf nicht mehr lediglich aus eigener Kraft das Medium ansaugen muss, sondern vielmehr das Medium stets unter dem Förderdruck der Schlauchpumpe vor dem Dosierkopf ansteht, kann die Dosierpumpe nunmehr eine gleichbleibend exakte Dosierung gewährleisten, ohne eine zusätzliche Beheizungseinrichtung oder Entlüftung vorzusehen.Because the dosing head no longer only has to suck in the medium under its own power, but rather the medium is always present in front of the dosing head under the delivery pressure of the hose pump, the dosing pump can now ensure consistently exact dosing without providing an additional heating device or ventilation.

Eine solche Schlauchpumpe kann der Dosierpumpe auch baueinheitlich zugeordnet sein, dergestalt, dass die Zulaufleitung bei Bedarf durch die Schlauchpumpe hindurchgelegt werden kann, wenn die eingangs genannten kritischen Medien gefördert werden sollen.Such a peristaltic pump can also be assigned to the metering pump as a unit, in such a way that the feed line can be passed through the peristaltic pump if required when the critical media mentioned at the beginning are to be conveyed.

Damit das Medium stets unter ausreichendem Druck an dem Dosierkopf anliegt, kann mit einigem Vorteil die Schlauchpumpe so ausgelegt sein, dass ein von ihr erzeugter erster Fördervolumenstrom wenigstens gleich groß ist wie ein von der Dosierpumpe erzeugter zweiter Fördervolumenstrom.So that the medium is always applied to the dosing head under sufficient pressure, the hose pump can with some advantage be designed so that a first delivery volume flow generated by it is at least as large as a second delivery volume flow generated by the dosing pump.

Alternativ ist es auch möglich, die Schlauchpumpe und die Dosierpumpe im Wechsel zu betreiben. Dann fährt die Dosierpumpe nach einem Ausfördern des Inhalts des Dosierkopfs in eine offene Endlage, signalisiert diese Endlage, vorzugsweise über einen Lagesensor an die Schlauchpumpe, die wiederum daraufhin beginnt, den Dosierkopf zu füllen, soweit dies nicht bereits durch die Saugwirkung der Dosierpumpe selbst bereits erfolgt ist. Mithilfe eines Drucksensors kann zudem erfasst werden, wann das Medium im Dosierkopf in ausreichender Menge anliegt, so dass dann der nächste Förderzyklus der Dosierpumpe beginnen kann.Alternatively, it is also possible to operate the peristaltic pump and the metering pump alternately. Then the dosing pump moves to an open end position after the contents of the dosing head have been conveyed out, signals this end position, preferably via a position sensor, to the hose pump, which in turn then begins to fill the dosing head, unless this is already done by the suction of the dosing pump itself is. With the help of a pressure sensor, it can also be recorded when the medium is present in sufficient quantities in the dosing head so that the next delivery cycle of the dosing pump can then begin.

In einer Variante der Erfindung kann zwischen der Schlauchpumpe und der Dosierpumpe ein Ausgleichsgefäß vorgesehen sein, welches über die Schlauchpumpe befüllt werden kann und aus dem die Dosierpumpe durch eigene Saugwirkung herausfördert. In diesem Fall könnte die Beheizung, Entlüftung und geödätisch erhöhte Lagerung nicht auf die Dosierpumpe bzw. den Medienbehälter angewendet werden, sondern es würde ausreichen, das Ausgleichsgefäß dergestalt vorzusehen. Auch könnte wiederum die Saugwirkung der Dosierpumpe durch die Anordnung einer Überdruckpumpe in dem Ausgleichsgefäß verbessert werden.In a variant of the invention, a compensating tank can be provided between the hose pump and the metering pump, which can be filled via the hose pump and from which the metering pump pumps out by its own suction. In this case, the heating, venting and geodetically increased storage could not be applied to the metering pump or the media container, but it would be sufficient to provide the compensation tank in this way. The suction effect of the metering pump could again be improved by arranging an overpressure pump in the equalization tank.

Die vorstehend beschriebene Erfindung wird im Folgenden anhand eines Ausführungsbeispiels näher erläutert.The invention described above is explained in more detail below using an exemplary embodiment.

Es zeigen

Figur 1
eine Fördereinheit, bestehend aus einer Dosierpumpe mit einer vorgeschalteten Schlauchpumpe in einer schematischen Darstellung, sowie
Figur 2
eine Variante der Fördereinheit gemäß Figur 1 mit einem zwischen der Schlauchpumpe und der Dosierpumpe zwischengeschalteten Ausgleichsgefäß in einer schematischen Darstellung.
Show it
Figure 1
a delivery unit, consisting of a metering pump with an upstream hose pump in a schematic representation, and
Figure 2
a variant of the conveyor unit according to Figure 1 with a compensation tank interposed between the hose pump and the metering pump in a schematic representation.

Figur 1 zeigt eine Fördereinheit 1, welche aus einer Dosierpumpe 2 und einer Schlauchpumpe 6 aufgebaut ist. Die Dosierpumpe speist sich über eine Zulaufleitung 4 aus einem Medienbehälter 10 mit einem zähflüssigen Medium 11. Um sicherzustellen, dass die Dosierpumpe 2 nicht aufgrund von Ansaugproblemen unsauber dosiert, wird ihr Dosierkopf 3 von der Schlauchpumpe 6 unterstützt, in welche die Zulaufleitung 4 der Dosierpumpe 2 eingelegt ist, wodurch diese in eine Zulaufleitung 7 der Schlauchpumpe und eine Ablaufleitung 8 der Schlauchpumpe geteilt wird. Ein freies Ende der Zulaufleitung 7 taucht in den Medienbehälter 10 ein, so dass die Schlauchpumpe 6 in an sich bekannter Art und Weise Medium 11 aus dem Medienbehälter 10 ansaugt. Figure 1 shows a delivery unit 1, which is composed of a metering pump 2 and a hose pump 6. The metering pump is fed with a viscous medium 11 from a media container 10 via an inlet line 4 is inserted, whereby it is divided into an inlet line 7 of the hose pump and a drain line 8 of the hose pump. A free end of the supply line 7 dips into the media container 10, so that the hose pump 6 sucks in medium 11 from the media container 10 in a manner known per se.

Dies erfolgt über einen Rotor, um den die Zulaufleitung 7 herumgelegt ist und welcher Rollen- oder Gleitelemente aufweist, welche die Zulaufleitung zudrücken. Aufgrund der Rotation des Rotors wird ein zugedrückter Bereich der Zulaufleitung um den Rotor weitergefördert, was sich bei fortgesetzter Rotation fortwährend wiederholt. Es ist hierdurch möglich, auch viskose Medien, sowie ausgasende Medien und Medien im Bereich eines kritischen Punktes gleichmäßig zu fördern.This takes place via a rotor around which the feed line 7 is wrapped and which has roller or sliding elements which press the feed line shut. Due to the rotation of the rotor, a compressed area of the feed line around the rotor is conveyed further, which is repeated over and over again with continued rotation. This makes it possible to use viscous media as well to convey outgassing media and media evenly in the area of a critical point.

Auf diese Weise befüllt die Schlauchpumpe 6 den Dosierkopf 3 der Dosierpumpe 2, der wiederum aufgrund seiner zuverlässigen Befüllung in der Lage ist, gleichmäßig über eine Ablaufleitung 8 in einen nachgeschalteten Prozess 12 zu dosieren.In this way, the peristaltic pump 6 fills the dosing head 3 of the dosing pump 2, which in turn, due to its reliable filling, is able to dose evenly via a discharge line 8 into a downstream process 12.

Zunächst kann die Schlauchpumpe 6 dabei kontinuierlich arbeiten und dafür sorgen, dass stets ein gleichbleibender Mediendruck an einer Saugseite des Dosierkopfs 3 anliegt. Hierfür ist es insbesondere erforderlich, dass ein von der Schlauchpumpe 6 erzeugter Fördervolumenstrom größer ist als ein von der Dosierpumpe 2 erzeugter Fördervolumenstrom in Richtung des Prozesses 12.First, the peristaltic pump 6 can work continuously and ensure that a constant medium pressure is always applied to a suction side of the dosing head 3. For this purpose, it is particularly necessary that a delivery volume flow generated by the hose pump 6 is greater than a delivery volume flow generated by the metering pump 2 in the direction of the process 12.

Alternativ ist es aber auch möglich, die Lage einer Membran im Dosierkopf 3 mittels eines Lagesensors elektrisch zu erfassen und dieses Signal an die Schlauchpumpe 6 zu übermitteln. Bei Erreichen einer Endlage der Membran in einem Zustand, in dem eine Dosierkammer des Dosierkopfs 3 ihre maximale Ausdehnung erreicht, wird die Schlauchpumpe 6 zugeschaltet und fördert so lange Medium in den Dosierkopf 3, bis mittels eines Drucksensors festgestellt wird, dass der Dosierkopf, mithin die Dosierkammer, vollständig gefüllt ist. Dann wird die Schlauchpumpe 6 gestoppt und die Dosierpumpe 2 fördert das in dem Dosierkopf 3 enthaltene Medium 11 über die Ablaufleitung 5 in den Prozess 12. Danach fährt die Membran wieder in die Endlage und der Vorgang wiederholt sich erneut.Alternatively, however, it is also possible to electrically detect the position of a membrane in the dosing head 3 by means of a position sensor and to transmit this signal to the hose pump 6. When the diaphragm reaches an end position in a state in which a dosing chamber of the dosing head 3 reaches its maximum extent, the peristaltic pump 6 is switched on and pumps medium into the dosing head 3 until a pressure sensor detects that the dosing head, and therefore the Dosing chamber is completely filled. Then the hose pump 6 is stopped and the dosing pump 2 conveys the medium 11 contained in the dosing head 3 via the drain line 5 into the process 12. The membrane then moves back to the end position and the process is repeated again.

Figur 2 zeigt eine Variante der soeben beschriebenen Ausgestaltung der Fördereinheit, bei der die Schlauchpumpe 6 nicht direkt in den Dosierkopf 3, sondern vielmehr in ein Ausgleichsgefäß 9 fördert, welches geodätisch oberhalb des Dosierkopfs 3 gelagert ist. Während die Schlauchpumpe 6 einen gleichmäßigen Zustrom in das Ausgleichsgefäß 9 ermöglicht, erfolgt aus dem Ausgleichsgefäß heraus ein positiver Zustrom in den Dosierkopf 3 hinein, was durch eine Überdruckpumpe in dem Ausgleichsgefäß 9 noch unterstützt werden kann. Um die Viskosität des Mediums 11 zu senken, kann dem Ausgleichsgefäß 9 ferner noch eine Heizung zugeordnet sein, mit der das Medium 11 erwärmt wird, so dass es mit geringerer Viskosität in die Dosiermpumpe 2 gefördert werden kann. Figure 2 shows a variant of the embodiment of the delivery unit just described, in which the peristaltic pump 6 does not deliver directly into the dosing head 3, but rather into a compensation vessel 9 which is geodetically supported above the dosing head 3. While the peristaltic pump 6 enables a uniform inflow into the equalization vessel 9, a positive inflow from the equalization vessel into the dosing head 3 takes place, which can still be supported by an overpressure pump in the compensation tank 9. In order to lower the viscosity of the medium 11, the compensation tank 9 can also be assigned a heater with which the medium 11 is heated so that it can be conveyed into the metering pump 2 with a lower viscosity.

Vorstehend beschrieben ist somit eine Fördereinheit, bei welcher der Dosierkopf einer Dosierpumpe mithilfe einer vorgeschalteten Schlauchpumpe befüllt wird und die dadurch auch bei hochviskosen oder unter Umgebungsbedingungen ausgasenden oder kritischen Medien das Auftreten von Kavitation verhindert und eine exakte Dosierung ermöglicht.A delivery unit is thus described above in which the dosing head of a dosing pump is filled with the aid of an upstream peristaltic pump and which thus prevents cavitation from occurring and enables precise dosing even with highly viscous media or media that are outgassing under ambient conditions or critical media.

BEZUGSZEICHENLISTEREFERENCE LIST

11
FördereinheitDelivery unit
22
DosierpumpeDosing pump
33
DosierkopfDosing head
44th
ZulaufleitungFeed line
55
AblaufleitungDrain line
66th
SchlauchpumpePeristaltic pump
77th
ZulaufleitungFeed line
88th
AblaufleitungDrain line
99
AusgleichsgefäßCompensation tank
1010
MedienbehälterMedia container
1111
Mediummedium
1212
Prozessprocess

Claims (10)

  1. Delivery unit for metering media (11) which are highly viscous, which outgas under ambient conditions or which are critical, comprising a metering pump (2) that has a metering head (3) for quantity-defined delivery of medium (11), which is introduced into the metering head (3), into a discharge line (5) of the metering pump (2), the metering head (3) being connected, on the supply side, to the discharge line (8) of a peristaltic pump (6) for filling the metering head (3), while a supply line (7) of the peristaltic pump (6) is connected to a media container (10), characterized in that the peristaltic pump (6) is designed such that a first delivery volumetric flow rate generated thereby is at least as large as a second delivery volumetric flow rate generated by the metering pump (2).
  2. Delivery unit according to claim 1, characterized in that the metering pump (2) is assigned at least one position sensor for detecting the end positions of a diaphragm in the metering head (3) and the peristaltic pump (6) is data-connected to this position sensor.
  3. Delivery unit for metering media (11) which are highly viscous, which outgas under ambient conditions or which are critical, comprising a metering pump (2) that has a metering head (3) for quantity-defined delivery of medium (11), which is introduced into the metering head (3), into a discharge line (5) of the metering pump (2), the metering head (3) being connected, on the supply side, to the discharge line (8) of a peristaltic pump (6) for filling the metering head (3), while a supply line (7) of the peristaltic pump (6) is connected to a media container (10), characterized in that the discharge line (8) of the peristaltic pump (6) has an equalization vessel (9) which is preferably mounted geodetically above the metering head (3) of the metering pump (2).
  4. Delivery unit according to claim 3, characterized in that the equalization vessel (9) is assigned a heater, a booster pump and/or an air relief valve.
  5. Method for metering media (11) which are highly viscous, which outgas under ambient conditions or which are critical, by means of a metering pump (2) which has a metering head (3) from which the medium (11) is dispensed into a discharge line (5) of the metering pump (2), the metering head (3) being filled with medium (11) with the aid of a peristaltic pump (6), which pump has a supply line (7) connected to a media container (10), the discharge line (8) of which pump is connected, on the supply side, to the metering head (3), characterized in that the metering head (3) is continuously filled, a first delivery volumetric flow rate generated by the peristaltic pump (6) being at least as large as a second delivery volumetric flow rate generated by the metering pump (2).
  6. Method according to claim 5, characterized in that the metering pump (2) moves into an end position after a delivery cycle, as a result of which at least one position sensor assigned to the metering head (3) for detecting the end position signals to the peristaltic pump (6) that the end position has been reached, whereupon the peristaltic pump (6) fills the metering head (3) of the metering pump (2), and said head, after the filling thereof is complete, dispenses the introduced medium (11) into the discharge line (5) of the metering pump (2) in a new delivery cycle.
  7. Method according to claim 6, characterized in that completion of the filling of the metering head (3) is detected either in the peristaltic pump (6) or in the metering head (3) itself, preferably with the aid of a pressure sensor, and detection of completion of the filling triggers dispensing via the metering head (3) and stopping of the peristaltic pump (6).
  8. Method for metering media (11) which are highly viscous, which outgas under ambient conditions or which are critical, by means of a metering pump (2) which has a metering head (3) from which the medium (11) is dispensed into a discharge line (5) of the metering pump (2), characterized in that the metering head (2) is connected to an equalization vessel (9), which is filled with medium (11) from a media container (10) with the aid of a peristaltic pump (6).
  9. Method according to claim 8, characterized in that the equalization vessel (9) is mounted geodetically above the metering head (3) of the metering pump (2).
  10. Method according to either claim 8 or claim 9, characterized in that the equalization vessel (9) is assigned a heater, a booster pump and/or an air relief valve.
EP19205808.9A 2018-12-20 2019-10-29 Delivery unit and method for metering highly viscous or critical media under ambient conditions Active EP3670905B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018133213.0A DE102018133213A1 (en) 2018-12-20 2018-12-20 Conveying unit and method for dosing highly viscous media or gases that are gassing or critical under ambient conditions

Publications (2)

Publication Number Publication Date
EP3670905A1 EP3670905A1 (en) 2020-06-24
EP3670905B1 true EP3670905B1 (en) 2020-12-02

Family

ID=68387206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19205808.9A Active EP3670905B1 (en) 2018-12-20 2019-10-29 Delivery unit and method for metering highly viscous or critical media under ambient conditions

Country Status (3)

Country Link
EP (1) EP3670905B1 (en)
DE (1) DE102018133213A1 (en)
ES (1) ES2841025T3 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2651614C2 (en) * 1976-11-12 1984-10-04 Lang Apparatebau GmbH, 8227 Siegsdorf Dosing pump
DE4219664C2 (en) * 1992-06-16 1995-11-16 Prominent Dosiertechnik Gmbh Delivery unit for a positive displacement metering pump
DE10043490C2 (en) * 2000-09-01 2003-05-22 Heraeus Kulzer Gmbh & Co Kg Device for mixing two flowable reaction components
DE102004045355A1 (en) * 2004-09-17 2006-04-06 Tesa Ag Method and device for dispensing a liquid flow metered at high pressure
DE102010003218A1 (en) * 2010-03-24 2011-09-29 Prominent Dosiertechnik Gmbh Method for controlling and / or regulating a metering pump
DE202010009485U1 (en) * 2010-05-06 2010-12-23 Cpa Gmbh Template device for presenting a liquid and metering device for liquids with such a template device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3670905A1 (en) 2020-06-24
DE102018133213A1 (en) 2020-06-25
ES2841025T3 (en) 2021-07-07

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