EP0354484A1 - Dosing pump - Google Patents

Dosing pump Download PDF

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Publication number
EP0354484A1
EP0354484A1 EP89114391A EP89114391A EP0354484A1 EP 0354484 A1 EP0354484 A1 EP 0354484A1 EP 89114391 A EP89114391 A EP 89114391A EP 89114391 A EP89114391 A EP 89114391A EP 0354484 A1 EP0354484 A1 EP 0354484A1
Authority
EP
European Patent Office
Prior art keywords
dosing
pump
metering
stroke
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89114391A
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German (de)
French (fr)
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EP0354484B1 (en
Inventor
Hans Dipl.-Ing. Kern (Fh)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gruenbeck Wasseraufbereitung GmbH
Original Assignee
Gruenbeck Wasseraufbereitung GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gruenbeck Wasseraufbereitung GmbH filed Critical Gruenbeck Wasseraufbereitung GmbH
Priority to AT89114391T priority Critical patent/ATE71434T1/en
Publication of EP0354484A1 publication Critical patent/EP0354484A1/en
Application granted granted Critical
Publication of EP0354484B1 publication Critical patent/EP0354484B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0042—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member
    • F04B7/0053—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member for reciprocating distribution members

Definitions

  • the invention relates to a metering pump according to the preamble of claim 1.
  • Such a metering pump is known from DE-PS 36 31 984. This is designed such that the venting device closes a small time period before the pressure stroke of the metering membrane is carried out and opens a small time period after the metering stroke has ended. A pressure valve is provided in the return line. This means that the return is not exactly defined.
  • the object of the invention is to provide a metering pump of the type described in the opening paragraph, in which the return flow is precisely defined.
  • the metering pump 1 has a pump head 2. This has a pump chamber 3 extending in the vertical direction. At the lower end of the pumping chamber, seen in the vertical direction, there is a suction channel 4, which is connected to a suction line 6 via a suction valve 5. The suction line 6 leads into a dosing agent container 7.
  • a riser 8 opens.
  • the upper end of the riser as seen in the vertical direction leads via a pressure valve 9 to a connection 10 that can be connected to a metering point.
  • a diaphragm pump with a clamped-in metering diaphragm 11, which is firmly connected to a plunger 12 on its rear side, is provided.
  • the plunger has a stop 13.
  • a compression spring 15 is provided, which biases the membrane 11 in the suction position.
  • a motor 34 is fastened in the pump housing 17 connected to the pump head 2 in the manner shown in FIG. 1. This has a motor-driven shaft 18 which carries a metering eccentric 19. The end 16 of the plunger 12 is biased by the compression spring 15 on the metering eccentric 19.
  • a cross bore 20 opens as directly as possible at the upper end of the riser 8, that is to say directly in front of the pressure valve 9. This leads into the valve chamber 21 of a ventilation device formed by a membrane valve 22. At the end of the transverse bore 20, a valve seat 23 is incorporated. A return line 25 connects in the upper region of the valve chamber 21 as seen in the vertical direction. In the exemplary embodiment shown, this leads back into the dosing agent container 7.
  • the membrane of the membrane valve 22 is firmly connected on its side facing away from the valve chamber with a tappet 26. Between the back of the membrane and a wall part 27 of the housing, a compression spring 28 is provided, which is biased so that the membrane is initially held in the closed position shown in FIG. 1.
  • the end of the plunger facing away from the membrane has a yoke 29.
  • a second eccentric 31 running on the shaft 18 runs in the yoke 29.
  • the eccentric 31 is connected to the shaft 18 via an intermediate gear 32.
  • the second eccentric 31 is designed such that the plunger 26 is moved in the desired angular range such that the membrane of the diaphragm valve 22 executes a stroke against the compression spring 28.
  • the two eccentrics 19 and 31 are so angularly offset from each other that the cycle shown in Fig. 4a takes place.
  • the diaphragm valve 22 is open during a metering stroke of the metering membrane 11.
  • the vent valve formed by the diaphragm valve opens. This ensures that gas present during the metering stroke exits via the return line.
  • the ratio determined by the design of the intermediate gear 32 is selected such that the diaphragm valve 22 does not release the return flow with every metering stroke but with every nth pressure stroke, where n is an integer smaller than the number of Dosing strokes. n also determines the dosing quantity. E.g. Vented every second stroke, halves the original dosage. If the air is only vented every tenth stroke, the dosing quantity is reduced by only 1/10.
  • the embodiment shown in FIG. 2 differs from that shown in FIG. 1 only in that the diaphragm valve 22 is actuated by a separate solenoid 39.
  • the solenoid 39 is controlled by a controller 40.
  • a sensor 45 is provided which detects the rotational position of the metering eccentric 19 and delivers an output signal via this rotary position to the controller 40 in order to ensure the synchronization of the metering stroke of the diaphragm valve 22 with the diaphragm 11 in the manner described above.
  • the controller 40 is designed such that, as in the first embodiment, the venting takes place only on every n-th metering stroke, as can be seen from FIG. 4b.
  • a second lifting magnet 41 is provided instead of the motor 34 with shaft 18 and metering eccentric 19.
  • the control of the two solenoids 39 and 41 takes place via the control 40.
  • the temporal work sequence for the membrane 11 and the membrane of the membrane valve 22 takes place in the same way as in the previous two exemplary embodiments, as can be seen from FIG. 4c.
  • the venting stroke runs so synchronously with the respective metering stroke that during the nth metering stroke the venting valve is open, otherwise it is closed.
  • the number n can be set via the controller 40.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

A dosing pump (1) with a pumping chamber (3) with a diaphragm valve for delivery to a dosing point is created which is self-priming and self-bleeding. To ensure that a precise setting of the dosing volume is achieved, the diaphragm valve and the bleeding device (22) are coupled to one another in such a way that the bleeding device (22) is open during a delivery stroke and closed during suction. <IMAGE>

Description

Die Erfindung betrifft eine Dosierpumpe nach dem Oberbegriff des Patentanspruches 1.The invention relates to a metering pump according to the preamble of claim 1.

Eine derartige Dosierpumpe ist aus der DE-PS 36 31 984 bekannt. Diese ist so ausgebildet, daß die Entlüftungseinrichtung jeweils einen kleinen Zeitabschnitt vor dem Ausführen des Druckhubes der Dosiermembran schließt und einen kleinen Zeitabschnitt nach dem Beendigen des Dosierhubes öffnet. In der Rücklaufleitung ist ein Druckventil vorgesehen. Dadurch ist der Rücklauf nicht genau definiert.Such a metering pump is known from DE-PS 36 31 984. This is designed such that the venting device closes a small time period before the pressure stroke of the metering membrane is carried out and opens a small time period after the metering stroke has ended. A pressure valve is provided in the return line. This means that the return is not exactly defined.

Aufgabe der Erfindung ist es, eine Dosierpumpe der eingangs beschriebenen Art zu schaffen, bei der der Rücklauf genau definiert ist.The object of the invention is to provide a metering pump of the type described in the opening paragraph, in which the return flow is precisely defined.

Diese Aufgabe wird durch die im Patentanspruch 1 gekennzeich­nete Dosierpumpe gelöst.This object is achieved by the metering pump characterized in claim 1.

Weitere Merkmale und Zweckmäßigkeiten der Erfindung ergeben sich aus der Beschreibung von Ausführungsbeispielen anhand der Figuren. Von den Figuren zeigen:

  • Fig. 1 einen Schnitt durch eine erste Ausführungsform einer Dosierpumpe;
  • Fig. 2 eine der Fig. entsprechende Darstellaung einer abgewandelten Ausführungsform;
  • Fig. 3 eine der Fig. 1 entsprechende Darstellung einer weiteren abgewandelten Ausführungsform; und
  • Fig. 4a bis 4c den zeitlichen Verlauf der Hübe der Pumpenteile.
Further features and advantages of the invention result from the description of exemplary embodiments with reference to the figures. From the figures show:
  • 1 shows a section through a first embodiment of a metering pump.
  • FIG. 2 shows a representation corresponding to that of a modified embodiment; FIG.
  • 3 shows a representation corresponding to FIG. 1 of a further modified embodiment; and
  • 4a to 4c the time course of the strokes of the pump parts.

Die Dosierpumpe 1 weist einen Pumpenkopf 2 auf. Dieser weist eine sich in vertikaler Richtung erstreckende Pumpkammer 3 auf. An dem in vertikaler Richtung gesehen unteren Ende der Pump­kammer schließt sich ein Saugkanal 4 an, der über ein Saugven­til 5 mit einer Saugleitung 6 verbunden ist. Die Saugleitung 6 führt in einen Dosiermittelbehälter 7.The metering pump 1 has a pump head 2. This has a pump chamber 3 extending in the vertical direction. At the lower end of the pumping chamber, seen in the vertical direction, there is a suction channel 4, which is connected to a suction line 6 via a suction valve 5. The suction line 6 leads into a dosing agent container 7.

An dem in vertikaler Richtung gesehen oberen Ende der Pump­kammer 3 mündet eine Steigleitung 8. Das in vertikaler Richtung gesehen obere Ende derselben führt über ein Druckventil 9 zu einem mit einer Dosierstelle verbindbaren Anschluß 10.At the upper end of the pump chamber 3 as seen in the vertical direction, a riser 8 opens. The upper end of the riser as seen in the vertical direction leads via a pressure valve 9 to a connection 10 that can be connected to a metering point.

In der Pumpkammer ist in der in Fig. 1 gezeigten Weise eine Membranpumpe mit einer eingespannten Dosiermembran 11, die auf auf ihrer Rückseite mit einem Stößel 12 fest verbunden ist, vorgesehen. Der Stößel weist einen Anschlag 13 auf. Zwischen diesem und einer festen Rahmenplatte 14 ist eine Druckfeder 15 vorgesehen, die die Membran 11 in die Saugstellung vorspannt.In the pump chamber, as shown in FIG. 1, a diaphragm pump with a clamped-in metering diaphragm 11, which is firmly connected to a plunger 12 on its rear side, is provided. The plunger has a stop 13. Between this and a fixed frame plate 14, a compression spring 15 is provided, which biases the membrane 11 in the suction position.

In dem mit dem Pumpenkopf 2 in der in Fig. 1 gezeigten Weise verbundenen Pumpengehäuse 17 ist ein Motor 34 befestigt. Dieser weist eine motorangetriebene Welle 18 auf, die einen Dosier­exzenter 19 trägt. Das Ende 16 des Stößels 12 liegt vorgespannt durch die Druckfeder 15 an dem Dosierexzenter 19 an.A motor 34 is fastened in the pump housing 17 connected to the pump head 2 in the manner shown in FIG. 1. This has a motor-driven shaft 18 which carries a metering eccentric 19. The end 16 of the plunger 12 is biased by the compression spring 15 on the metering eccentric 19.

Möglichst unmittelbar am oberen Ende der Steigleitung 8, also unmittelbar vor dem Druckventil 9, mündet eine Querbohrung 20. Diese führt in den Ventilraum 21 einer durch ein Membranventil 22 gebildeten Entlüftungseinrichtung. Am Ende der Querbohrung 20 ist ein Ventilsitz 23 eingearbeitet. In dem in vertikaler Richtung gesehen oberen Bereich des Ventilraumes 21 schließt eine Rücklaufleitung 25 an. Diese führt in dem gezeigten Aus­führungsbeispiel in den Dosiermittelbehälter 7 zurück.A cross bore 20 opens as directly as possible at the upper end of the riser 8, that is to say directly in front of the pressure valve 9. This leads into the valve chamber 21 of a ventilation device formed by a membrane valve 22. At the end of the transverse bore 20, a valve seat 23 is incorporated. A return line 25 connects in the upper region of the valve chamber 21 as seen in the vertical direction. In the exemplary embodiment shown, this leads back into the dosing agent container 7.

Die Membran des Membranventils 22 ist auf ihrer dem Ventilraum abgewandten Seite mit einem Stößel 26 fest verbunden. Zwischen Rückseite der Membran und einem Wandungsteil 27 des Gehäuses ist eine Druckfeder 28 vorgesehen, die so vorgespannt ist, daß die Membran zunächst in der in Fig. 1 gezeigten Schließstellung gehalten wird.The membrane of the membrane valve 22 is firmly connected on its side facing away from the valve chamber with a tappet 26. Between the back of the membrane and a wall part 27 of the housing, a compression spring 28 is provided, which is biased so that the membrane is initially held in the closed position shown in FIG. 1.

Das der Membran abgewandte Ende des Stößels weist ein Joch 29 auf. In dem Joch 29 läuft ein auf der Welle 18 sitzender zweiter Exzenter 31. Der Exzenter 31 ist über ein Zwischen­getriebe 32 mit der Welle 18 verbunden.The end of the plunger facing away from the membrane has a yoke 29. A second eccentric 31 running on the shaft 18 runs in the yoke 29. The eccentric 31 is connected to the shaft 18 via an intermediate gear 32.

Der zweite Exzenter 31 ist so ausgebildet, daß in dem gewünsch­ten Winkelbereich der Stößel 26 so bewegt wird, daß die Membran des Membranventiles 22 einen Hub entgegen der Druckfeder 28 ausführt.The second eccentric 31 is designed such that the plunger 26 is moved in the desired angular range such that the membrane of the diaphragm valve 22 executes a stroke against the compression spring 28.

Die beiden Exzenter 19 und 31 sind so winkelmäßig gegeneinander versetzt, daß der in Fig. 4a gezeigte Taktablauf stattfindet.The two eccentrics 19 and 31 are so angularly offset from each other that the cycle shown in Fig. 4a takes place.

Daraus ergibt sich, daß das Membranventil 22 während eines Dosierhubes der Dosiermembran 11 geöffnet ist. Mit Beendigung des Dosierhubes öffnet das durch das Membranventil gebildete Entlüftungsventil. Auf diese Weise wird sichergestellt, daß beim Dosierhub vorhandenes Gas über die Rücklaufleitung austritt.It follows from this that the diaphragm valve 22 is open during a metering stroke of the metering membrane 11. When the dosing stroke ends, the vent valve formed by the diaphragm valve opens. This ensures that gas present during the metering stroke exits via the return line.

Wie aus Fig. 4a ersichtlich ist, ist die durch die Ausbildung des Zwischengetriebes 32 bestimmte Übersetzung so gewählt, daß das Membranventil 22 nicht bei jedem Dosierhub sondern bei jedem n-ten Druckhub den Rücklauf freigibt, wobei n eine ganze Zahl kleiner als die Anzahl der Dosierhübe ist. n bestimmt auch die Dosiermenge. Wird z.B. bei jedem zweiten Hub entlüftet, halbiert sich die ursprüngliche Dosiermenge. Wird nur bei jedem zehnten Hub entlüftet, verringert sich die Dosiermenge ledig­lich um 1/10.As can be seen from Fig. 4a, the ratio determined by the design of the intermediate gear 32 is selected such that the diaphragm valve 22 does not release the return flow with every metering stroke but with every nth pressure stroke, where n is an integer smaller than the number of Dosing strokes. n also determines the dosing quantity. E.g. Vented every second stroke, halves the original dosage. If the air is only vented every tenth stroke, the dosing quantity is reduced by only 1/10.

Die in Fig. 2 gezeigte Ausführungsform unterscheidet sich gegenüber der in Fig. 1 gezeigten lediglich dadurch, daß das Membranventil 22 von einem separaten Hubmagneten 39 betätigt wird. Der Hubmagnet 39 wird über eine Steuerung 40 angesteuert. Es ist ein Sensor 45 vorgesehen, der die Drehstellung des Dosierexzenters 19 erfaßt und ein Ausgangssignal über diese Drehstellung an die Steuerung 40 liefert, um die Synchroni­sation des Dosierhubes das Membranventil 22 in der oben be­schriebenen Weise mit der Membran 11 sicherzustellen. Die Steuerung 40 ist so ausgebildet, daß wie bei der ersten Aus­führungsform die Entlüftung lediglich bei jedem n-ten Dosierhub erfolgt, wie dies aus Fig. 4b ersichtlich ist.The embodiment shown in FIG. 2 differs from that shown in FIG. 1 only in that the diaphragm valve 22 is actuated by a separate solenoid 39. The solenoid 39 is controlled by a controller 40. A sensor 45 is provided which detects the rotational position of the metering eccentric 19 and delivers an output signal via this rotary position to the controller 40 in order to ensure the synchronization of the metering stroke of the diaphragm valve 22 with the diaphragm 11 in the manner described above. The controller 40 is designed such that, as in the first embodiment, the venting takes place only on every n-th metering stroke, as can be seen from FIG. 4b.

Bei der in Fig. 3 gezeigten Ausführungsform ist anstelle des Motors 34 mit Welle 18 und Dosierexzenter 19 ein zweiter Hub­magnet 41 vorgesehen. Die Ansteuerung der beiden Hubmagnete 39 und 41 erfolgt über die Steuerung 40. Der zeitliche Arbeitsab­lauf für die Membran 11 und die Membran des Membranventiles 22 erfolgt in der gleichen Weise wie bei den vorhergehenden beiden Ausführungsbeispielen, wie aus Fig. 4c ersichtlich ist. Bei allen drei Ausführungsformen läuft der Entlüftungshub also so synchron zum jeweiligen Dosierhub ab, daß während des jeweils n-ten Dosierhubes das Entlüftungsventil geöffnet, ansonsten geschlossen ist. Über die Steuerung 40 ist dabei die Zahl n einstellbar.In the embodiment shown in FIG. 3, a second lifting magnet 41 is provided instead of the motor 34 with shaft 18 and metering eccentric 19. The control of the two solenoids 39 and 41 takes place via the control 40. The temporal work sequence for the membrane 11 and the membrane of the membrane valve 22 takes place in the same way as in the previous two exemplary embodiments, as can be seen from FIG. 4c. In all three embodiments, the venting stroke runs so synchronously with the respective metering stroke that during the nth metering stroke the venting valve is open, otherwise it is closed. The number n can be set via the controller 40.

Claims (4)

1. Dosierpumpe mit einer Pumpkammer mit einer Membranpumpe zum Fördern zu einer Dosierstelle, wobei die Pumpkammer über eine ein Saugventil aufweisende Saugleitung mit einem Dosiermittel­behälter und ausgangsseitig mit der Dosierstelle verbindbar ist, und der Ausgang mit einer eine Entlüftungseinrichtung auf­weisenden Rücklaufleitung verbunden ist,
dadurch gekennzeichnet, daß die Membranpumpe und die Entlüf­tungseinrichtung so mitein-ander gekoppelt sind, daß die Ent­lüftungseinrichtung während eines Druckhubes geöffnet und während des Saugens geschlossen ist.1.Dosing pump with a pump chamber with a diaphragm pump for delivery to a dosing point, the pump chamber being connectable to a dosing agent container via a suction line having a suction valve and to the dosing point on the output side, and the outlet being connected to a return line having a venting device,
characterized in that the diaphragm pump and the venting device are coupled to one another in such a way that the venting device is open during a pressure stroke and closed during suction. 2. Dosierpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß die Entlüftungseinrichtung nur bei jedem n-ten Druckhubes geöffnet ist.2. dosing pump according to claim 1,
characterized in that the venting device is only opened at every nth pressure stroke. 3. Dosierpumpe nach Anspruch 1,
dadurch gekennzeichnet, daß die Entlüftungseinrichtung über einen Hubmagneten antreibbar ist.3. dosing pump according to claim 1,
characterized in that the ventilation device can be driven via a lifting magnet. 4. Dosierpumpe nach Anspruch 3,
dadurch gekennzeichnet, daß auch die Membranpumpe über einen Hubmagneten antreibbar ist.4. dosing pump according to claim 3,
characterized in that the diaphragm pump can also be driven via a lifting magnet.
EP89114391A 1988-08-12 1989-08-03 Dosing pump Expired - Lifetime EP0354484B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89114391T ATE71434T1 (en) 1988-08-12 1989-08-03 DOSING PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3827489A DE3827489C1 (en) 1988-08-12 1988-08-12
DE3827489 1988-08-12

Publications (2)

Publication Number Publication Date
EP0354484A1 true EP0354484A1 (en) 1990-02-14
EP0354484B1 EP0354484B1 (en) 1992-01-08

Family

ID=6360773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114391A Expired - Lifetime EP0354484B1 (en) 1988-08-12 1989-08-03 Dosing pump

Country Status (5)

Country Link
US (1) US4990066A (en)
EP (1) EP0354484B1 (en)
JP (1) JPH02140470A (en)
AT (1) ATE71434T1 (en)
DE (2) DE3827489C1 (en)

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Also Published As

Publication number Publication date
JPH02140470A (en) 1990-05-30
EP0354484B1 (en) 1992-01-08
ATE71434T1 (en) 1992-01-15
US4990066A (en) 1991-02-05
DE58900696D1 (en) 1992-02-20
DE3827489C1 (en) 1989-10-12

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