EP0260464B1 - Dosing pump - Google Patents

Dosing pump Download PDF

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Publication number
EP0260464B1
EP0260464B1 EP87111972A EP87111972A EP0260464B1 EP 0260464 B1 EP0260464 B1 EP 0260464B1 EP 87111972 A EP87111972 A EP 87111972A EP 87111972 A EP87111972 A EP 87111972A EP 0260464 B1 EP0260464 B1 EP 0260464B1
Authority
EP
European Patent Office
Prior art keywords
membrane
pump
valve
dosing
metering
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.)
Expired - Lifetime
Application number
EP87111972A
Other languages
German (de)
French (fr)
Other versions
EP0260464A1 (en
Inventor
Hans Kern
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 AT87111972T priority Critical patent/ATE50321T1/en
Publication of EP0260464A1 publication Critical patent/EP0260464A1/en
Application granted granted Critical
Publication of EP0260464B1 publication Critical patent/EP0260464B1/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
    • 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
    • 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
    • F04B43/0009—Special features
    • F04B43/0045—Special features with a number of independent working chambers which are actuated successively by one mechanism
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

A metering pump comprises a pump chamber with a diaphragm for delivering a metering agent to a metering point. The pump chamber is adapted to be connected with the metering agent tank through a suction conduit comprising a suction valve. Moreover, a return conduit comprising a head valve is provided. For providing an automatic bleeding or ventilation of the metering pump and the possibility of using the pump also for metering aggressive media, the outlet of the pump chamber is adapted to be connected with the metering point through a second head valve. The outlet is connected with the return conduit and a bleed valve is provided in the return conduit.

Description

Die Erfindung betrifft eine Dosierpumpe nach dem ersten Teil des Patentanspruchs 1.The invention relates to a metering pump according to the first part of patent claim 1.

Eine derartige Dosierpumpe ist aus der DE-A 2 803 470 bekannt. Das bei dieser bekannten Dosierpumpe in der Rücklaufleitung angeordnete Entlüftungsventil ist als Flüssigkeitsdrosselventil ausgebildet, das praktisch nur Gase durchläßt und das Passieren von Flüssigkeiten verhindert. Damit können die Gase aus der Pumpkammer während des Druckhubes aus der Pumpkammer in den Dosiermittelbehälter zurückgefördert werden. Es kann jedoch nicht verhindert werden, daß beim Druckhub ebenfalls Gas zur Dosierstelle gelangt.Such a metering pump is known from DE-A 2 803 470. The vent valve arranged in the return line in this known metering pump is designed as a liquid throttle valve which practically only lets gases through and prevents the passage of liquids. The gases from the pump chamber can thus be conveyed back from the pump chamber into the dosing agent container during the pressure stroke. However, it cannot be prevented that gas also reaches the metering point during the pressure stroke.

Aus der DE-A 2 651 614 ist eine Dosierpumpe bekannt, bei der die Membranpumpe als Vorförderpumpe wirkt. Zusätzlich ist eine Kolbenpumpe mit den erforderlichen Kolbendichtungen als Dosierpumpe vorgesehen. Die Kolbendichtungen haben beim Dosieren aggressiver Medien nur eine begrenzte Lebensdauer, so daß solche Pumpen für das Dosieren aggressiver Medien nicht geeignet sind.From DE-A 2 651 614 a metering pump is known in which the diaphragm pump acts as a pre-feed pump. In addition, a piston pump with the necessary piston seals is provided as a metering pump. The piston seals have a limited lifespan when dosing aggressive media, so that such pumps are not suitable for dosing aggressive media.

Aufgabe der Erfindung ist es, eine Dosierpumpe der eingangs beschriebenen Art zu schaffen, die selbstansaugend und selbstentlüftend ist.The object of the invention is to provide a metering pump of the type described above, which is self-priming and self-venting.

Diese Aufgabe wird durch eine Dosierpumpe mit den Merkmalen des Patentanspruches 1 gelöst. Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.This object is achieved by a metering pump with the features of claim 1. Further developments of the invention are characterized in the subclaims.

Im weiteren werden Ausführungsbeispiele der Figuren beschrieben. Von den Figuren zeigen:

  • Fig. 1 einen Schnitt durch eine Dosierpumpe;
  • Fig. 2 den zeitlichen Verlauf der Hübe der Pumpenteile; und
  • Fig. 3 eine der Fig. 1 entsprechende Darstellung einer abgewandelten Ausführungsform.
Exemplary embodiments of the figures are described below. From the figures show:
  • 1 shows a section through a metering pump.
  • 2 shows the time course of the strokes of the pump parts; and
  • Fig. 3 is a representation corresponding to FIG. 1 of a modified embodiment.

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 Dosiermembran 11 eingespannt und auf ihrer Rückseite mit einem Stößel 12 fest verbunden. 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.A metering membrane 11 is clamped in the pump chamber in the manner shown in FIG. 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 eine Welle 18 gelagert, die einen Dosierexzenter 19 trägt. Das Ende 16 des Stößels liegt vorgespannt durch die Druckfeder 15 an dem Dosierexzenter 19 an.In the pump housing 17 connected to the pump head 2 in the manner shown in FIG. 1, a shaft 18 is supported which carries a metering eccentric 19. The end 16 of the plunger is biased against the metering eccentric 19 by the compression spring 15.

Möglichst unmittelbar am oberen Ende der Steigleitung 8, also unmittelbar vor dem Druckventil 9, mündet eine Querbohrung 20. Diese führt in den Ventilraum 21 eines durch eine Membranpumpe 22 gebildeten Entlüftungsventiles. Am Ende der Querbohrung 20 ist ein Ventilsitz 23 eingearbeitet. In dem in vertikaler Richtung gesehen oberen Bereich des Ventilraumes 21 schließt ein Steigrohr 23 an, welches über ein Druckventil 24 mit einer Rücklaufleitung 25 verbunden ist. Diese führt in dem gezeigten Ausführungsbeispiel in den Dosiermittelbehälter 7 zurück.A transverse 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 valve formed by a diaphragm pump 22. At the end of the transverse bore 20, a valve seat 23 is incorporated. In the upper region of the valve chamber 21, seen in the vertical direction, there is a riser pipe 23, which is connected to a return line 25 via a pressure valve 24. In the exemplary embodiment shown, this leads back into the dosing agent container 7.

Die Membran 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 is firmly connected to a tappet 26 on its side facing away from the valve chamber. 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 ist mit einem Joch 29 einstellbar durch eine Kontermutter 30 verbunden.The end of the plunger facing away from the membrane is adjustably connected to a yoke 29 by a lock nut 30.

In dem Joch 29 läuft ein auf der Welle 18 sitzender zweiter Exzenter 31. Die beiden Exzenter sind in dem in Fig. 1 gezeigten Ausführungsbeispiel fest mit einem Zahnrad 32 verbunden, welches antriebsmäßig mit einem Ritzel 33 eines Antriebsmotors 34 verbunden ist.In the yoke 29, a second eccentric 31 sits on the shaft 18. In the exemplary embodiment shown in FIG. 1, the two eccentrics are fixedly connected to a toothed wheel 32, which is drivingly connected to a pinion 33 of a drive motor 34.

Der zweite Exzenter 31 ist so ausgebildet, daß in dem gewünschten Winkelbereich der Stößel 26 so bewegt wird, daß die Membran 35 der Membranpumpe einen Saughub 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 diaphragm 35 of the diaphragm pump executes a suction stroke against the compression spring 28.

Die beiden Exzenter 19 und 31 sind so winkelmäßig gegeneinander versetzt, daß der in Fig. 2 gezeigte Taktablauf stattfindet. Daraus ergibt sich, daß das durch die Membranpumpe 22 gebildete Ventil un einen kleinen Zeitabschnitt 36 vor dem Ausführen des Druckhubes der Dosiermembran 11 schließt. Ist der Dosierhub ausgeführt, öffnet das durch die Membranpumpe gebildete Entlüftungsventil un einen kleinen Zeitabschnitt 42 nach dem Beendigen des Dosierhubes. Während dieses Zeitabschnittes hat der Saughub 43 der Membran 11 bereits begonnen. Das Entlüftungsventil schließt durch Aufsetzen der Membran 35 in die in Fig. 1 gezeigte Stellung um einen kleinen Zeitabschnitt 44 vor dem Beenden des Saughubes. Auf diese Weise wird sichergestellt, daß beim Druckhub kein Gas in das System gelangen kann.The two eccentrics 19 and 31 are so angularly offset from one another that the cycle shown in FIG. 2 takes place. As a result, the valve formed by the diaphragm pump 22 closes a small time period 36 before the pressure stroke of the metering diaphragm 11 is carried out. If the metering stroke is carried out, the vent valve formed by the diaphragm pump opens a small time period 42 after the metering stroke has ended. During this period, the suction stroke 43 of the membrane 11 has already started. The vent valve closes by placing the membrane 35 in the position shown in FIG. 1 a short time period 44 before the end of the suction stroke. This ensures that no gas can enter the system during the pressure stroke.

Wie aus Fig. 1 ersichtlich ist, besteht ein Abstand 37 zwischen dem Joch 29 und dem zweiten Exzenter 31. Durch diesen Abstand 37 wird die Exzenterbewegung in eine Nockenbewegung umgewandelt, wobei die Druckfeder 28 die Vorwärtsbewegung und Zuhaltekraft übernimmt. Die Druckfeder 28 kann in ihrer Zuhaltekraft so ausgelegt sein, daß sie bei einem bestimmten Druck in Pumpenkopf nachgibt, so daß das Entlüftungsventil auch noch als Überdruckventil wirkt.As can be seen from FIG. 1, there is a distance 37 between the yoke 29 and the second eccentric 31. This distance 37 converts the eccentric movement into a cam movement, the compression spring 28 taking over the forward movement and locking force. The locking spring 28 can be designed in such a way that it yields at a certain pressure in the pump head, so that the vent valve also acts as a pressure relief valve.

Die in Fig. 3 gezeigte Ausführungsform weist zunächst alle in Fig. 1 gezeigten Merkmale auf. Zusätzlich ist zwischen der Steigleitung 8 und dem durch die Membranpumpe 22 gebildeten Entlüftungsventil ein Rückschlagventil 38 vorgesehen. Durch dieses wird das Entlüften beschleunigt.The embodiment shown in FIG. 3 initially has all the features shown in FIG. 1. In addition, between the riser 8 and the a check valve 38 is provided by the vent valve formed by the diaphragm pump 22. This accelerates the venting.

Ferner wird der Stößel 26 nicht von dem Motor 34 sondern von einem separat angesteuerten Hubmagneten 39 in die Saugstellung zurückgezogen. Die Erregung des Hubmagneten 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 der Membran 35 in der oben beschriebenen Weise mit der Membran 11 sicherzustellen.Furthermore, the plunger 26 is not pulled back into the suction position by the motor 34 but by a separately controlled lifting magnet 39. The excitation of 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 to the controller 40 via this rotary position in order to ensure the synchronization of the metering stroke of the membrane 35 with the membrane 11 in the manner described above.

Die Steuerung 40 ist so ausgebildet, daß die Membran 35 nicht jedem Hub der Membran 11 folgt, sondern eine vorbestimmte Anzahl von Arbeitszyklen der Membran 11 in der in Figur 3 gezeigten geschlossenen Stellung verbleibt. Dadurch wird erreicht, daß die Membran 35 wesentlich weniger benutzt wird, ohne daß dadurch die Pumpleistung der Pumpe insgesamt beeinträchtigt werden würde. Die Steuerung 40 kann so eingestellt werden, daß die Zahl der ausgelassenen Hübe durch die Membran 35 in Abhängigkeit von dem zu fördernden Medium und dessen Ausgasungsneigung einstellbar ist.The controller 40 is designed in such a way that the membrane 35 does not follow each stroke of the membrane 11, but remains a predetermined number of working cycles of the membrane 11 in the closed position shown in FIG. It is thereby achieved that the diaphragm 35 is used much less without the pump performance of the pump as a whole being impaired. The controller 40 can be set so that the number of skipped strokes through the membrane 35 is adjustable depending on the medium to be conveyed and its tendency to outgas.

Claims (9)

1. A dosing pump with a pump chamber (3) with a membrane (11) for delivery to a dosing point, the pump chamber (3) being capable of connection via a suction line (6) having a suction valve (5) to a container for the dosing medium, with a return line (25) having a first pressure valve (24) as well as a vent valve (22), as well as an outlet that can be connected to a dosing point, which outlet is connected to the return line (25) and has a second pressure valve (9) characterized by an actuation device (31-34; 39, 40) which actuates the vent valve (22) in such a way that it is closed during the whole pressure stroke of the membrane (11).
2. A dosing pump according to claim 1, characterized in that the actuation device (31-34; 39, 40) releases the vent valve (22) during the suction stroke of the membrane (11).
3. A dosing pump according to claim 1 or 2, characterized in that the actuation device (31-34; 39, 40) closes the vent valve (22) a short time before effecting the pressure stroke of the membrane (11).
4. A dosing pump according to one of claims 1 to 3, characterized in that the actuation device (31-34; 39, 40) opens the vent valve (22) a short time after completion of the pressure stroke of the membrane (11).
5. A dosing pump according to one of claims 1 to 4, characterized in that the vent valve (22) is designed as a membrane pump.
6. A dosing pump according to one of claims 1 to 5, characterized in that provision is made for a rising line (8) between the pump chamber (3) and the second pressure valve (9).
7. A dosing pump according to claim 6, characterized in that the return line (25) issues as closely as possible at the end of the rising line (8) into the latter.
8. A dosing pump according to one of claims 5 to 7, characterized in that the two membranes (11, 35) can be driven via a common drive.
9. A dosing pump according to claim 8, characterized in that the vent valve (22) designed as a membrane pump only effects a suction stroke per every (n/m) th stroke, n being the number of strokes of the membrane (11) of the pump chamber and m being a natural number.
EP87111972A 1986-09-19 1987-08-18 Dosing pump Expired - Lifetime EP0260464B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87111972T ATE50321T1 (en) 1986-09-19 1987-08-18 DOSING PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3631984A DE3631984C1 (en) 1986-09-19 1986-09-19 Dosing pump
DE3631984 1986-09-19

Publications (2)

Publication Number Publication Date
EP0260464A1 EP0260464A1 (en) 1988-03-23
EP0260464B1 true EP0260464B1 (en) 1990-02-07

Family

ID=6309976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111972A Expired - Lifetime EP0260464B1 (en) 1986-09-19 1987-08-18 Dosing pump

Country Status (5)

Country Link
US (1) US4865525A (en)
EP (1) EP0260464B1 (en)
JP (1) JPS6388283A (en)
AT (1) ATE50321T1 (en)
DE (1) DE3631984C1 (en)

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Also Published As

Publication number Publication date
DE3631984C1 (en) 1987-12-17
US4865525A (en) 1989-09-12
EP0260464A1 (en) 1988-03-23
ATE50321T1 (en) 1990-02-15
JPS6388283A (en) 1988-04-19

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