EP1412639B1 - Dosing pump - Google Patents

Dosing pump Download PDF

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Publication number
EP1412639B1
EP1412639B1 EP02776914A EP02776914A EP1412639B1 EP 1412639 B1 EP1412639 B1 EP 1412639B1 EP 02776914 A EP02776914 A EP 02776914A EP 02776914 A EP02776914 A EP 02776914A EP 1412639 B1 EP1412639 B1 EP 1412639B1
Authority
EP
European Patent Office
Prior art keywords
metering pump
pistons
valve block
slide
pump according
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
EP02776914A
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German (de)
French (fr)
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EP1412639A1 (en
Inventor
Willi Hempelmann
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Micro Mechatronic Technologies AG
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Micro Mechatronic Technologies AG
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Publication date
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Publication of EP1412639A1 publication Critical patent/EP1412639A1/en
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Publication of EP1412639B1 publication Critical patent/EP1412639B1/en
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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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • 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

Definitions

  • the invention relates to a metering pump, in particular a metering pump for small delivery quantities, as defined in the preamble of claims 1 and 2.
  • the invention provides a metering pump is proposed, which has a simple construction on and for dosing, especially for small quantities is versatile.
  • valve block 2 On a base plate 1 of a pump unit 100 (FIG. 5), a valve block 2 is fastened by means of screws 21, which accommodates a correspondingly conically shaped control plug 3 in a conical bore (FIG. 3). As shown in FIG. 1, the valve block 2 is provided on the underside with a suction hole 4 and diametrically opposite on the top with a discharge hole 5, wherein in the region of these holes 4 and 5 grooves 6 and 7 on the circumference are formed of the control block 3, each extending about half the circumference and by webs 8 and 8 'are separated from each other.
  • valve bores 9 and 10 are formed opposite to each other, where cylinder tubes 11 and 11 'are frontally attached, which are held by a holding plate 12 and 12' between this and the valve block 2 clamped ,
  • a piston 13 or 13 ' is guided in each of these cylinder tubes 11 and 11', the piston rod 30 of which is fastened to a slide arm 14 'or 14 "on the rear side of the base plate 1 (FIG Slider 14 out, which connects the two slide arms 14 'and 14 "together.
  • the electric motor 201 drives via a countershaft gear 202, which consists of, for example, two intermeshing gears, a threaded spindle 203, with a nut 204 is engaged, which is connected via a protruding bolt 205 with the slider 14 in conjunction
  • the direction of rotation of the motor 201 is switched over by limit switches 206 and 207 when an actuating element 208 adjustably mounted on the nut 204 comes into contact with the respective limit switches 206 and 207 when the end positions of the pistons 13 and 13 'are reached.
  • projections 16 are formed on the slide 14 at a distance from one another, which are displaceable in a recess 1a of the base plate 1 and to which a respective stop pin 17 or 17 'is adjustably mounted by a thread.
  • These stop pins 17 and 17 ' cooperate with a lever 18 which is eccentrically mounted on the back of the control block 3 such that upon contact of the stop pins 17, the control chick 3 is pivoted about its axis over a predetermined angular range, so when changing from the delivery to the suction stroke of the piston, the control chick 3 is pivoted.
  • the piston 13 In the operating position of Fig. 1, the piston 13 is at the end of the ejection movement, in which the medium contained in the cylinder tube 11 and in the circumferential groove 6 of the control plug 3 medium was ejected through the overhead dispensing bore 5, while the piston 13 ', a suction movement has performed, was sucked through the medium through the lower intake hole 4 in the circumferential groove 7 and in the cylinder tube 11 '.
  • the lever 18 may be attached to the control chick 3, so that the control chick 3 is switched directly by the stop pins 17.
  • a spring-loaded snap device is preferably provided.
  • the lever 18 is formed radially on a pin 42 projecting, which is rotatably mounted in a bore 214 of a housing 220 of the drive unit 200 via a ball bearing (Fig. 3).
  • the lever 18 on the pin 42 is designed as an eccentric, which engages in an approximately V-shaped recess 44 on the back of the control block 3.
  • the recess 44 is indicated, which widens radially outward. Furthermore, as shown in FIG.
  • a radially projecting lever 19 is used on the pin 42 via a polygonal pin 43, on which a spring 20 engages, which is fastened to the housing 220 at the other end (FIG. 3).
  • the tension spring 20 is moved over a dead center position, whereby the spring with snap effect pivots the pin 42 and thus the eccentric lever 18, so that the control chick 3 is accelerated to the intended pivot position is switched.
  • Fig. 4a shows a partial perspective view of the snap device, wherein the eccentric lever 18 rests against one side of the recess 44 and the control chicks 3 holds in the predetermined switching position.
  • the stopper pin 17 on the control chicks projecting section of the eccentric lever 18 comes to rest and this slightly pivoted counterclockwise in Fig. 4a, so the control chicks 3 is not yet moved by lifting the eccentric lever 18 from its position until the spring 20 comes after exceeding the dead center position to the effect and the pin 42nd accelerates further rotates, so that the eccentric lever 18 comes to rest from the position in Fig. 4a on the other side of the recess 44, whereby the control chick is accelerated in the other switching position is switched.
  • the juxtaposed pistons and cylinder tubes can have different diameters, so that there is a three-phase pump that delivers three different delivery volumes.
  • the smallest diameter piston pump having the smallest piston / cylinder diameter can be designed for flow rates of 1 to 1000 ⁇ l / hr, while the middle pump delivers 4 to 4000 ⁇ l / hr with a slightly larger piston / cylinder diameter.
  • the material flows delivered by the individual pumps are in a quantity ratio dependent on the piston diameter.
  • the three streams can be combined with each other via a downstream, not shown, valve device.
  • the streams delivered by the three pumps can also be completely different media.
  • the diameter of the cylinder tubes and piston can be designed the same in the illustrated three pumps. Depending on the intended use, the diameters of cylinder tube and piston in the individual pumps can be adapted to the respective requirements.
  • the Rumpentician 100 with the three individual pumps can be adjusted continuously via an unillustrated control electronics for the motor 201 in the entire volume range, the pump is self-priming and can produce high pressures.
  • the surface of the conical control plug 3 is lapped, so that a tight contact with the correspondingly machined surface of the conical bore in the valve block 2 results, whereby separate sealing elements between the individual pumps or between the individual circumferential grooves can be omitted.
  • the piston diameters are each made larger than the width of the grooves 6 and 7 on the control plug 3, so that the piston 13 can come to rest on the surface of the control plug 3.
  • the front side of the piston is chamfered and convex in accordance with the radius of the control block in the region of the respective cylinder bore.
  • the piston rod 30 is inserted via a projection 31 of smaller diameter in a central bore of the piston. Between the end face of this extension 31 and piston 13, an elastic member 32 is inserted, while the rear end face of the piston 13 has a small clearance relative to the portion of the piston rod 30 with a larger diameter.
  • the piston 13 can thereby be brought to rest on the peripheral surface of the control block 3 in order to keep dead spaces as low as possible without excessive pressure being exerted on the circumferential surface of the control plug by the piston rod 30.
  • the diameter of the cylinder bores 9 and 10 in the valve block 2 corresponds to the inner diameter of the cylinder tubes 11 and 11 ', so that the cylinder bore continues in each case the cylinder space formed by the cylinder bore 9, 10.
  • the cylinder tube 11 is inserted into a receiving bore 22 of the valve block 2, wherein a sealing ring 34 between the end face of the cylinder tube 11 and paragraph between the cylinder bore 9 and receiving bore 22 is provided.
  • a clamping element 35 (FIG. 3) surrounding the piston rod 30 with external thread is screwed into a threaded bore in the retaining plate 12. This clamping element 35 is located above a another sealing ring 36 on the outer end face of the cylinder tube 11 and holds this between the two sealing rings 34 and 36 clamped.
  • the outer end of the piston rod 30 is fixed via a locking screw 37 in a bore of the slide arm 14 'or 14 ", so that a fine adjustment of the piston position can be made relative to the control chick 3.
  • the power train between the drive motor 201 and the piston 13 of the pumps is designed without play.
  • the motor 201 drives the zero-clearance countershaft gear 202, through which the threaded spindle 203 mounted in bearings 209 and 209 'is turned backlash-free in the two directions of rotation when the rotational movement of the motor is switched over.
  • the nut 204 is slotted and provided with a clamping element, such as a screw, which is indicated at 210, so that the engagement of the nut 204 can be adjusted without play with the threaded spindle 203.
  • a flange 240 is mounted, which has a recess in which an eccentric ring 241 is mounted with the outer circumference.
  • a further flange 242 is mounted, which is fastened by screws to a stationary element 243 of the housing 220.
  • the threaded spindle 203 is engaged with a threaded ring 245, which is rotatably mounted in the bearing 209.
  • the threaded spindle is located on a shoulder on the bearing 209 '.
  • the threaded spindle can be kept clamped on the bearing 209 ', so that the bearing of the threaded spindle is free of play.
  • the spring element 211 between pin 205 and bore circumference may be, for example, a spring ring corrugated along the circumference.
  • FIG. 6 The schematically illustrated in Fig. 6 structure of the drive train between the motor 201 and bolt 205 is housed in the housing 220 of the drive unit 200, wherein the bolt 205 protrudes from the front of the housing 220 in a slot 213, as shown in FIG. In the housing 220 and the drive electronics, not shown, for the control of the motor 201 is housed.
  • a bearing ball 216 (FIG. 5) is arranged in a bore, which is spring-loaded and concentrically abuts the back of the control block 3 during assembly of the drive unit and pump unit 100 in order to provide the control chick with a predetermined contact force to hold the conical bore of the valve block in the axial direction.
  • the bearing ball 216 acting spring 217 can be changed by an adjusting device, not shown in their contact force so that the bearing ball 216 rests with a predetermined contact pressure on the flat rear side of the control block.
  • clamping elements 230 in the form of pivotable hooks on the opposite sides are attached to the housing 220 and cooperate with pins 40 projecting laterally from the base plate 1 of the pump unit 100.
  • pins 40 projecting laterally from the base plate 1 of the pump unit 100.
  • the hook-shaped clamping elements 230 can also be replaced by a single clamping bracket, which connects the drive unit 200 to the pump unit 100.
  • the pump unit 100 can be quickly released from the drive unit 200, so that the pump unit z. B. can be sterilized in an autoclave at higher temperatures.
  • the pump unit can be dismantled in a short time, with all media-carrying components such as pistons, cylinder tubes and control chicks are freely accessible for cleaning purposes.
  • the pump unit 100 can be coupled quickly to the drive unit 200 via the clamping elements 230, wherein the pin 205 engages in the bore 43 on the slider 14 and the eccentric 43 in the recess 44 on the back of the control block 3. This engagement is performed by engaging in the mating holes 41 of the base plate 1 dowel pins 231.
  • the metering pump By conditioning the piston 13 on the peripheral surface of the control block 3, the metering pump is constructed so that there are no possible dead spaces. If air is to be sucked in through the lower intake bores 4, it will rise with the delivery flow upwards to the delivery bores 5, whereby possibly present air bubbles will be accelerated to the discharge bores by the pivoting movement of the control plug 3 during the switchover from delivery to intake stroke.
  • control chick 3 is switched as soon as the pistons 13 have reached their final stroke, so that the drive direction of the slide 14 and the control chick 3 are changed over substantially simultaneously.
  • the limit switch By separating the reversal of the motor by the limit switch on the one hand and the reversal of the plug by the stop pins 17 on the other hand, it is also possible to adjust by adjusting the limit switches 206 and 207, the drive direction of the slider 14, without at the same time the control chicks 3 is switched.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Vending Machines For Individual Products (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Peptides Or Proteins (AREA)

Abstract

The invention provides a metering pump having pistons (13, 13') which lie opposite one another, are guided in cylinders (11, 11') and are connected to one another by a slide (14) which is moved in a reciprocating manner by a drive motor (201), a switching device (3) being arranged between the pistons (13, 13') in a valve block (2), which switching device alternately connects the opposite cylinder spaces to a suction opening (4) and a delivery opening (5).

Description

Die Erfindung betrifft eine Dosierpumpe, insbesondere eine Dosierpumpe für kleine Liefermengen, wie im Oberbegriff der Ansprüche 1 und 2 definiert.The invention relates to a metering pump, in particular a metering pump for small delivery quantities, as defined in the preamble of claims 1 and 2.

Eine solche Pumpe ist bekannt aus der US-A-4 184 817, siehe insbesondere Spalte 4, Zeilen 34-50 davon.Such a pump is known from US-A-4,184,817, see in particular column 4, lines 34-50 thereof.

Durch die Erfindung soll eine Dosierpumpe vorgeschlagen werden, die einen einfachen Auf bau hat und für Dosierzwecke insbesondere bei kleinen Liefermengen vielseitig einsetzbar ist.The invention provides a metering pump is proposed, which has a simple construction on and for dosing, especially for small quantities is versatile.

Dies wird erfindungsgemäß durch eine Dosierpumpe nach den Ansprüchen 1 oder 2 erreicht, wobei sich durch die Anordnung einer Umschalteinrichtung zwischen einander gegenüberliegenden Kolben, die durch einen Schieber miteinander verbunden sind, ein einfacher Aufbau der Dosierpumpe ergibt.This is inventively achieved by a metering pump according to claims 1 or 2, wherein there is a simple structure of the metering pump by the arrangement of a switching device between opposing pistons which are interconnected by a slide.

Eine beispielsweise Ausführungsform der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Es zeigen

Fig. 1
eine Vorderansicht der Pumpeneinheit im Schnitt längs der Linie I-I in Fig. 3,
Fig. 2
eine Schnittdarstellung eines Kolbens,
Fig. 3
einen Schnitt längs der Linie II-II in Fig. 1,
Fig. 4
eine Rückansicht der Pumpeneinheit,
Fig. 4a
eine Ansicht der Schnappeinrichtung,
Fig. 5
eine perspektivische Ansicht der Dosierpumpe mit der von der Pumpeneinheit getrennten Antriebseinheit,
Fig. 6
in schematischer Darstellung den Antriebsstrang zwischen Motor und Schieber.
An exemplary embodiment of the invention will be explained in more detail with reference to the drawing. Show it
Fig. 1
a front view of the pump unit in section along the line II in Fig. 3,
Fig. 2
a sectional view of a piston,
Fig. 3
a section along the line II-II in Fig. 1,
Fig. 4
a rear view of the pump unit,
Fig. 4a
a view of the snap device,
Fig. 5
a perspective view of the metering pump with the separate from the pump unit drive unit,
Fig. 6
in a schematic representation of the drive train between the engine and slide.

Auf einer Basisplatte 1 einer Pumpeneinheit 100 (Fig. 5) ist mittels Schrauben 21 ein Ventilblock 2 befestigt, der in einer konischen Bohrung (Fig. 3) ein entsprechend konisch gestaltetes Steuerküken 3 aufnimmt. Wie Fig. 1 zeigt, ist der Ventilblock 2 auf der Unterseite mit einer Ansaugbohrung 4 und diametral gegenüberliegend auf der Oberseite mit einer Abgabebohrung 5 versehen, wobei im Bereich dieser Bohrungen 4 und 5 Nuten 6 und 7 auf dem Umfang des Steuerkükens 3 ausgebildet sind, die sich jeweils etwa um den halben Umfang erstrecken und durch Stege 8 und 8' voneinander getrennt sind. Ferner sind seitlich in dem Ventilblock 2 im Bereich der Nuten 6, 7 Zylinderbohrungen 9 und 10 einander gegenüberliegend ausgebildet, an denen Zylinderrohre 11 und 11' stirnseitig angesetzt sind, die durch eine Halteplatte 12 und 12' zwischen dieser und dem Ventilblock 2 eingespannt gehalten werden.On a base plate 1 of a pump unit 100 (FIG. 5), a valve block 2 is fastened by means of screws 21, which accommodates a correspondingly conically shaped control plug 3 in a conical bore (FIG. 3). As shown in FIG. 1, the valve block 2 is provided on the underside with a suction hole 4 and diametrically opposite on the top with a discharge hole 5, wherein in the region of these holes 4 and 5 grooves 6 and 7 on the circumference are formed of the control block 3, each extending about half the circumference and by webs 8 and 8 'are separated from each other. Further, laterally in the valve block 2 in the region of the grooves 6, 7 cylinder bores 9 and 10 are formed opposite to each other, where cylinder tubes 11 and 11 'are frontally attached, which are held by a holding plate 12 and 12' between this and the valve block 2 clamped ,

In diesen Zylinderrohren 11 und 11' ist jeweils ein Kolben 13 bzw. 13' geführt, dessen Kolbenstange 30 an einem Schieberarm 14' bzw. 14" befestigt ist. Auf der Rückseite der Basisplatte 1 (Fig. 4) ist in einer Führung 15 ein Schieber 14 geführt, der die beiden Schieberarme 14' und 14" miteinander verbindet. Dieser in der Draufsicht in Fig. 3 etwa U-formig gestaltete Schieber 14 mit den senkrecht abstehenden Schieberarmen 14' und 14" wird durch einen elektrischen Antriebsmotor hin und her bewegt, der in einer Antriebseinheit 200 (Fig. 5) untergebracht ist. Wie Fig. 6 schematisch zeigt, treibt der Elektromotor 201 über ein Vorgelegegetriebe 202, das aus beispielsweise zwei miteinander kämmenden Zahnrädern besteht, eine Gewindespindel 203 an, mit der eine Mutter 204 in Eingriff steht, die über einen abstehenden Bolzen 205 mit dem Schieber 14 in Verbindung steht. Die Drehrichtung des Motors 201 wird durch Endschalter 206 und 207 umgeschaltet, wenn ein an der Mutter 204 einstellbar angebrachtes Betätigungselement 208 bei Erreichen der Endstellungen der Kolben 13 und 13' an dem jeweiligen Endschalter 206 bzw. 207 zum Anliegen kommt.A piston 13 or 13 'is guided in each of these cylinder tubes 11 and 11', the piston rod 30 of which is fastened to a slide arm 14 'or 14 "on the rear side of the base plate 1 (FIG Slider 14 out, which connects the two slide arms 14 'and 14 "together. This slide 14 with the vertically projecting slide arms 14 'and 14 ", which is approximately U-shaped in plan view in FIG. 3, is moved back and forth by an electric drive motor which is accommodated in a drive unit 200 (FIG. 5) 6 schematically shows, the electric motor 201 drives via a countershaft gear 202, which consists of, for example, two intermeshing gears, a threaded spindle 203, with a nut 204 is engaged, which is connected via a protruding bolt 205 with the slider 14 in conjunction The direction of rotation of the motor 201 is switched over by limit switches 206 and 207 when an actuating element 208 adjustably mounted on the nut 204 comes into contact with the respective limit switches 206 and 207 when the end positions of the pistons 13 and 13 'are reached.

Bei dem in Fig. 4 dargestellten Ausführungsbeispiel sind am Schieber 14 in einem Abstand voneinander Ansätze 16 ausgebildet, die in einer Ausnehmung 1a der Basisplatte 1 verschiebbar sind und an denen jeweils ein Anschlagstift 17 bzw. 17' durch ein Gewinde einstellbar angebracht ist. Diese Anschlagstifte 17 und 17' wirken mit einem Hebel 18 zusammen, der außermittig auf der Rückseite des Steuerkükens 3 derart angebracht ist, dass bei Anlage eines der Anschlagstifte 17 das Steuerküken 3 über einen vorgegebenen Winkelbereich um seine Achse verschwenkt wird, damit beim Wechsel vom Förderhub zum Saughub der Kolben das Steuerküken 3 verschwenkt wird.In the embodiment shown in FIG. 4, projections 16 are formed on the slide 14 at a distance from one another, which are displaceable in a recess 1a of the base plate 1 and to which a respective stop pin 17 or 17 'is adjustably mounted by a thread. These stop pins 17 and 17 'cooperate with a lever 18 which is eccentrically mounted on the back of the control block 3 such that upon contact of the stop pins 17, the control chick 3 is pivoted about its axis over a predetermined angular range, so when changing from the delivery to the suction stroke of the piston, the control chick 3 is pivoted.

In der Betriebsstellung nach Fig. 1 befindet sich der Kolben 13 am Ende der Ausstoßbewegung, bei der das im Zylinderrohr 11 und in der Umfangsnut 6 des Steuerkükens 3 enthaltene Medium durch die oben liegende Abgabebohrung 5 ausgestoßen wurde, während gleichzeitig der Kolben 13' eine Ansaugbewegung ausgeführt hat, durch die Medium durch die unten liegende Ansaugbohrung 4 in die Umfangsnut 7 und in das Zylinderrohr 11' angesaugt wurde.In the operating position of Fig. 1, the piston 13 is at the end of the ejection movement, in which the medium contained in the cylinder tube 11 and in the circumferential groove 6 of the control plug 3 medium was ejected through the overhead dispensing bore 5, while the piston 13 ', a suction movement has performed, was sucked through the medium through the lower intake hole 4 in the circumferential groove 7 and in the cylinder tube 11 '.

Durch Umsteuern des Antriebsmotors 201 mittels eines der Endschalter 206 und 207 werden die Schieberarme 14' und 14" aus der Stellung in Fig. 1 nach links bewegt, wobei zugleich das Steuerküken 3 durch den Hebel 18 derart im Gegenuhrzeigersinn in Fig. 1 durch die Anschlagstifte 17 am Schieber 14 verschwenkt wird, dass die Stege 8 und 8' auf die jeweils andere Seite der Ansaugbohrung 4 und der Abgabebohrung 5 zu liegen kommen, so dass durch den Förderhub des Kolbens 13' das angesaugte Medium über die Umfangsnut 7 zur Abgabebohrung 5 befördert wird, während der Kolben 13 über die Ansaugbohrung 4 und die Umfangsnut 6 Medium ansaugt.By reversing the drive motor 201 by means of one of the limit switches 206 and 207, the slide arms 14 'and 14 "are moved from the position in Fig. 1 to the left, wherein at the same time the control chicks 3 by the lever 18 in such a counterclockwise direction in Fig. 1 by the stop pins 17 is pivoted on the slider 14, that the webs 8 and 8 'come to rest on the other side of the suction bore 4 and the discharge hole 5, so that transported by the delivery stroke of the piston 13', the sucked medium via the circumferential groove 7 to the discharge hole 5 is sucked while the piston 13 via the suction bore 4 and the circumferential groove 6 medium.

Der Hebel 18 kann am Steuerküken 3 angebracht sein, so dass das Steuerküken 3 durch die Anschlagstifte 17 direkt umgeschaltet wird. Um die Umschaltbewegung des Steuerkükens 3 durch den Schieber 14 zu beschleunigen, wird vorzugsweise eine federbeaufschlagte Schnappeinrichtung vorgesehen. Bei der in Fig. 4 wiedergegebenen Ausführungsform ist der Hebel 18 radial an einem Zapfen 42 abstehend ausgebildet, der in einer Bohrung 214 eines Gehäuses 220 der Antriebseinheit 200 über ein Kugellager drehbar gelagert ist (Fig. 3). Der Hebel 18 an dem Zapfen 42 ist als Exzenter gestaltet, der in eine etwa V-förmige Ausnehmung 44 auf der Rückseite des Steuerkükens 3 eingreift. In Fig. 4 ist die Ausnehmung 44 angedeutet, die sich radial nach außen erweitert. Ferner ist, wie Fig. 4a zeigt, am Zapfen 42 über einen Mehrkantzapfen 43 ein radial abstehender Hebel 19 eingesetzt, an dem eine Feder 20 angreift, die mit dem anderen Ende am Gehäuse 220 befestigt ist (Fig. 3). Sobald beispielsweise der Anschlagstift 17' am Exzenterhebel 18 zum Anliegen kommt und diesen in Fig. 4 etwas nach rechts gedrückt hat, wird die Zugfeder 20 über eine Totpunktlage bewegt, wodurch die Feder mit Schnappwirkung den Zapfen 42 und damit den Exzenterhebel 18 verschwenkt, so dass das Steuerküken 3 beschleunigt in die vorgesehene Schwenkstellung umgeschaltet wird. Der gleiche Vorgang erfolgt an dem gegenüberliegenden Anschlagstift 17, wobei durch Anlage des Anschlagstifts 17 am Exzenterhebel 18 die Feder 20 auf die andere Seite der Totpunktlage zu liegen kommt und das Steuerküken 3 über den am Zapfen 42 angebrachten Exzenterhebel 18 beschleunigt in die andere Schwenkstellung bewegt wird. Auf diese Weise können die Stege 8 und 8' am Steuerküken 3 schneller umgestellt werden als dies durch die Bewegung des Schiebers 14 allein möglich ist.The lever 18 may be attached to the control chick 3, so that the control chick 3 is switched directly by the stop pins 17. In order to accelerate the switching movement of the control block 3 by the slider 14, a spring-loaded snap device is preferably provided. In the embodiment shown in Fig. 4, the lever 18 is formed radially on a pin 42 projecting, which is rotatably mounted in a bore 214 of a housing 220 of the drive unit 200 via a ball bearing (Fig. 3). The lever 18 on the pin 42 is designed as an eccentric, which engages in an approximately V-shaped recess 44 on the back of the control block 3. In Fig. 4, the recess 44 is indicated, which widens radially outward. Furthermore, as shown in FIG. 4a, a radially projecting lever 19 is used on the pin 42 via a polygonal pin 43, on which a spring 20 engages, which is fastened to the housing 220 at the other end (FIG. 3). As soon as, for example, the stop pin 17 'comes to rest on the eccentric lever 18 and has pressed it somewhat to the right in FIG. 4, the tension spring 20 is moved over a dead center position, whereby the spring with snap effect pivots the pin 42 and thus the eccentric lever 18, so that the control chick 3 is accelerated to the intended pivot position is switched. The same process takes place on the opposite stop pin 17, wherein by abutment of the stop pin 17 on the eccentric lever 18, the spring 20 comes to rest on the other side of the dead center and the control chicks 3 is accelerated via the attached to the pin 42 eccentric lever 18 is moved to the other pivot position , In this way, the webs 8 and 8 'at the control chick 3 can be changed faster than is possible by the movement of the slider 14 alone.

Fig. 4a zeigt eine perspektivische Teilansicht der Schnappeinrichtung, wobei der Exzenterhebel 18 an einer Seite der Ausnehmung 44 anliegt und das Steuerküken 3 in der vorgegebenen Schaltstellung hält. Wenn der Anschlagstift 17 an dem vom Steuerküken vorstehenden Abschnitt des Exzenterhebels 18 zum Anliegen kommt und diesen etwas im Gegenuhrzeigersinn in Fig. 4a verschwenkt, so wird hierdurch das Steuerküken 3 durch Abheben des Exzenterhebels 18 noch nicht aus seiner Stellung bewegt, bis die Feder 20 nach Überschreiten der Totpunktlage zur Wirkung kommt und den Zapfen 42 beschleunigt weiter dreht, so dass der Exzenterhebel 18 aus der Stellung in Fig. 4a auf die andere Seite der Ausnehmung 44 zu liegen kommt, wodurch das Steuerküken beschleunigt in die andere Schaltstellung umgeschaltet wird.Fig. 4a shows a partial perspective view of the snap device, wherein the eccentric lever 18 rests against one side of the recess 44 and the control chicks 3 holds in the predetermined switching position. When the stopper pin 17 on the control chicks projecting section of the eccentric lever 18 comes to rest and this slightly pivoted counterclockwise in Fig. 4a, so the control chicks 3 is not yet moved by lifting the eccentric lever 18 from its position until the spring 20 comes after exceeding the dead center position to the effect and the pin 42nd accelerates further rotates, so that the eccentric lever 18 comes to rest from the position in Fig. 4a on the other side of the recess 44, whereby the control chick is accelerated in the other switching position is switched.

Wie Fig. 3 zeigt, sind bei dem dargestellten Ausführungsbeispiel auf dem Umfang des Steuerkükens 3 nebeneinander weitere Nuten 6', 6" und 7`, 7" ausgebildet, die mit entsprechenden Zylinderbohrungen 9', 9" und 10', 10" in Verbindung stehen, an denen entsprechende Zylinderrohre 11 und 11' angesetzt sind. In entsprechender Weise sind an den Schieberarmen 14' und 14" jeweils drei Kolben 13 und 13' befestigt und im Ventilblock 2 sind den jeweiligen Umfangsnuten 6, 7 zugeordnet Ansaugbohrungen 4' und 4" sowie Abgabebohrungen 5' und 5" ausgebildet, wie dies Fig. 5 zeigt. Auf diese Weise werden drei nebeneinanderliegende Einzelpumpen an der Pumpeneinheit 100 ausgebildet, die in der gleichen Weise angetrieben und umgesteuert werden.As shown in FIG. 3, in the illustrated embodiment, further grooves 6 ', 6 "and 7', 7" are formed next to each other on the circumference of the control plug 3, which are in communication with corresponding cylinder bores 9 ', 9 "and 10', 10" stand, where appropriate cylinder tubes 11 and 11 'are recognized. In a corresponding manner, three pistons 13 and 13 'are attached to the slide arms 14' and 14 "and in the valve block 2 are associated with the respective circumferential grooves 6, 7 Ansaugbohrungen 4 'and 4" and discharge bores 5' and 5 ", as shown 5. In this way, three adjacent single pumps are formed on the pump unit 100 which are driven and reversed in the same manner.

Die nebeneinanderliegenden Kolben und Zylinderrohre können unterschiedliche Durchmesser haben, so dass sich eine Dreistrompumpe ergibt, die drei unterschiedlich große Fördervolumina liefert. So kann beispielsweise die auf dem kleinsten Kükendurchmesser angeordnete Pumpe, die den kleinsten Kolben/Zylinderdurchmesser aufweist, für Fördermengen von 1 bis 1.000 µl/h ausgelegt sein, während die mittlere Pumpe mit einem etwas größeren Kolben/Zylinderdurchrnesser 4 bis 4000 µl/h liefert. Die auf dem größten Kükendurchmesser vorgesehene Pumpe mit dem größten Kolben/Zylinderdruchmesser kann hierbei z. B. eine Fördermenge von 10 bis 10.000 µl/h abgeben.The juxtaposed pistons and cylinder tubes can have different diameters, so that there is a three-phase pump that delivers three different delivery volumes. For example, the smallest diameter piston pump having the smallest piston / cylinder diameter can be designed for flow rates of 1 to 1000 μl / hr, while the middle pump delivers 4 to 4000 μl / hr with a slightly larger piston / cylinder diameter. The provided on the largest diameter of the diameter pump with the largest piston / Zylinderdruchmesser here z. B. deliver a flow rate of 10 to 10,000 ul / h.

Die von den einzelnen Pumpen gelieferten Stoffströme stehen in einem vom Kolbendurchmesser abhängigen Mengenverhältnis. Die drei Stoffströme können über eine nicht dargestellte, nachgeschaltete Ventileinrichtung beliebig miteinander kombiniert werden. Die von den drei Pumpen gelieferten Stoffströme können auch völlig unterschiedliche Medien sein.The material flows delivered by the individual pumps are in a quantity ratio dependent on the piston diameter. The three streams can be combined with each other via a downstream, not shown, valve device. The streams delivered by the three pumps can also be completely different media.

Der Durchmesser der Zylinderrohre und Kolben kann auch bei den dargestellten drei Pumpen gleich ausgelegt sein. Je nach Verwendungszweck können die Durchmesser von Zylinderrohr und Kolben bei den einzelnen Pumpen an die jeweiligen Erfordernisse angepasst werden.The diameter of the cylinder tubes and piston can be designed the same in the illustrated three pumps. Depending on the intended use, the diameters of cylinder tube and piston in the individual pumps can be adapted to the respective requirements.

Die Rumpeneinheit 100 mit den drei einzelnen Pumpen kann über eine nicht dargestellte Ansteuerelektronik für den Motor 201 im gesamten Mengenbereich stufenlos eingestellt werden, Die pumpe ist selbstansaugend und kann hohe Drücke erzeugen.The Rumpeneinheit 100 with the three individual pumps can be adjusted continuously via an unillustrated control electronics for the motor 201 in the entire volume range, the pump is self-priming and can produce high pressures.

Die Oberfläche des konischen Steuerkükens 3 wird geläppt, so dass sich eine dichte Anlage an der entsprechend bearbeiteten Fläche der konischen Bohrung im Ventilblock 2 ergibt, wodurch gesonderte Dichtungselemente zwischen den einzelnen Pumpen bzw. zwischen den einzelnen Umfangsnuten entfallen können.The surface of the conical control plug 3 is lapped, so that a tight contact with the correspondingly machined surface of the conical bore in the valve block 2 results, whereby separate sealing elements between the individual pumps or between the individual circumferential grooves can be omitted.

Die Kolbendurchmesser sind jeweils größer ausgelegt als die Breite der Nuten 6 und 7 am Steuerküken 3, so dass der Kolben 13 auf der Oberfläche des Steuerkükens 3 zum Anliegen kommen kann. Wie Fig. 2 zeigt, ist die Vorderseite der Kolben entsprechend dem Radius des Steuerkükens im Bereich der jeweiligen Zylinderbohrung abgeschrägt und konvex gestaltet. Die Kolbenstange 30 ist über einen Fortsatz 31 mit kleinerem Durchmesser in eine mittige Bohrung des Kolbens eingesetzt. Zwischen Stirnseite dieses Fortsatzes 31 und Kolben 13 ist ein elastisches Element 32 eingesetzt, während die rückwärtige Stirnseite des Kolbens 13 ein geringes Spiel gegenüber dem Abschnitt der Kolbenstange 30 mit größerem Durchmesser hat. Der Kolben 13 kann hierdurch an der Umfangsfläche des Steuerkükens 3 zum Anliegen gebracht werden, um Toträume möglichst gering zu halten, ohne dass durch die Kolbenstange 30 ein zu starker Druck auf die Umfangsfläche des Steuerkükens ausgeübt wird. Der Durchmesser der Zylinderbohrungen 9 und 10 im Ventilblock 2 entspricht dem Innendurchmesser der Zylinderrohre 11 und 11', so dass die Zylinderbohrung jeweils den durch die Zylinderbohrung 9, 10 gebildeten Zylinderraum fortsetzt.The piston diameters are each made larger than the width of the grooves 6 and 7 on the control plug 3, so that the piston 13 can come to rest on the surface of the control plug 3. As shown in FIG. 2, the front side of the piston is chamfered and convex in accordance with the radius of the control block in the region of the respective cylinder bore. The piston rod 30 is inserted via a projection 31 of smaller diameter in a central bore of the piston. Between the end face of this extension 31 and piston 13, an elastic member 32 is inserted, while the rear end face of the piston 13 has a small clearance relative to the portion of the piston rod 30 with a larger diameter. The piston 13 can thereby be brought to rest on the peripheral surface of the control block 3 in order to keep dead spaces as low as possible without excessive pressure being exerted on the circumferential surface of the control plug by the piston rod 30. The diameter of the cylinder bores 9 and 10 in the valve block 2 corresponds to the inner diameter of the cylinder tubes 11 and 11 ', so that the cylinder bore continues in each case the cylinder space formed by the cylinder bore 9, 10.

Das Zylinderrohr 11 ist in eine Aufnahmebohrung 22 des Ventilblocks 2 eingesetzt, wobei ein Dichtungsring 34 zwischen Stirnseite des Zylinderrohrs 11 und Absatz zwischen Zylinderbohrung 9 und Aufnahmebohrung 22 vorgesehen ist. Zum Einspannen des Zylinderrohrs 11 ist ein die Kolbenstange 30 umgebendes Spannelement 35 (Fig. 3) mit Außengewinde in eine Gewindebohrung in der Halteplatte 12 eingeschraubt. Dieses Spannelement 35 liegt über einem weiteren Dichtungsring 36 an der äußeren Stirnseite des Zylinderrohres 11 an und hält dieses zwischen den beiden Dichtungsringen 34 und 36 eingespannt.The cylinder tube 11 is inserted into a receiving bore 22 of the valve block 2, wherein a sealing ring 34 between the end face of the cylinder tube 11 and paragraph between the cylinder bore 9 and receiving bore 22 is provided. For clamping the cylinder tube 11, a clamping element 35 (FIG. 3) surrounding the piston rod 30 with external thread is screwed into a threaded bore in the retaining plate 12. This clamping element 35 is located above a another sealing ring 36 on the outer end face of the cylinder tube 11 and holds this between the two sealing rings 34 and 36 clamped.

Das außen liegende Ende der Kolbenstange 30 ist über eine Feststellschraube 37 in einer Bohrung des Schieberarms 14' bzw. 14" befestigt, so dass eine Feineinstellung der Kolbenstellung relativ zum Steuerküken 3 vorgenommen werden kann.The outer end of the piston rod 30 is fixed via a locking screw 37 in a bore of the slide arm 14 'or 14 ", so that a fine adjustment of the piston position can be made relative to the control chick 3.

Damit auch kleinste Liefermengen mit einem Kolbenhub im µ-Bereich präzise gefördert werden können, ist der Kraftstrang zwischen Antriebsmotor 201 und Kolben 13 der Pumpen spielfrei ausgebildet. Der Motor 201 treibt das spielfrei eingestellte Vorgelegegetriebe 202 an, durch das die in Lagern 209 und 209' gelagerte Gewindespindel 203 beim Umschalten der Drehbewegung des Motors spielfrei in die beiden Drehrichtungen gedreht wird. Die Mutter 204 ist geschlitzt ausgebildet und mit einem Spannelement, beispielsweise einer Schraube versehen, die bei 210 angedeutet ist, damit der Eingriff der Mutter 204 mit der Gewindespindel 203 spielfrei eingestellt werden kann.So that even the smallest delivery quantities can be precisely conveyed with a piston stroke in the μ range, the power train between the drive motor 201 and the piston 13 of the pumps is designed without play. The motor 201 drives the zero-clearance countershaft gear 202, through which the threaded spindle 203 mounted in bearings 209 and 209 'is turned backlash-free in the two directions of rotation when the rotational movement of the motor is switched over. The nut 204 is slotted and provided with a clamping element, such as a screw, which is indicated at 210, so that the engagement of the nut 204 can be adjusted without play with the threaded spindle 203.

Am Motor 201 ist ein Flansch 240 angebracht, der eine Ausnehmung aufweist, in der ein Exzenterring 241 mit dem Außenumfang gelagert ist. Am Innenumfang des Exzenterrings 241 ist ein weiterer Flansch 242 gelagert, der über Schrauben an einem stationären Element 243 des Gehäuses 220 befestigt ist. Durch eine Verdrehung des Exzenterrings 241 kann die Verzahnung des Vorgelegegetriebes 202 spielfrei eingestellt werden, worauf die beiden Flansche 240 und 242 durch Schrauben 244 fest miteinander verbunden werden.On the motor 201, a flange 240 is mounted, which has a recess in which an eccentric ring 241 is mounted with the outer circumference. On the inner circumference of the eccentric ring 241, a further flange 242 is mounted, which is fastened by screws to a stationary element 243 of the housing 220. By a rotation of the eccentric ring 241, the teeth of the countershaft transmission 202 can be adjusted without play, whereupon the two flanges 240 and 242 are connected by screws 244 firmly together.

Die Gewindespindel 203 steht mit einem Gewindering 245 in Eingriff, der im Lager 209 verdrehbar gelagert ist. Auf der gegenüberliegenden Seite liegt die Gewindespindel über einen Absatz am Lager 209' an. Durch den Gewindering 245 kann die Gewindespindel am Lager 209' eingespannt gehalten werden, so dass auch die Lagerung der Gewindespindel spielfrei ist.The threaded spindle 203 is engaged with a threaded ring 245, which is rotatably mounted in the bearing 209. On the opposite side, the threaded spindle is located on a shoulder on the bearing 209 '. Through the threaded ring 245, the threaded spindle can be kept clamped on the bearing 209 ', so that the bearing of the threaded spindle is free of play.

Schließlich ist der von der Mutter 204 abstehende Bolzen 205 über ein steifes Federelement 211 in einer Bohrung 43 des Schiebers 14 eingesetzt, so dass auch an dieser Verbindungsstelle kein Spiel auftreten kann. Das Federelement 211 zwischen Bolzen 205 und Bohrungsumfang kann beispielsweise ein längs des Umfangs gewellter Federring sein.Finally, the protruding from the nut 204 bolt 205 is inserted via a rigid spring element 211 in a bore 43 of the slider 14, so that even at this juncture no play can occur. The spring element 211 between pin 205 and bore circumference may be, for example, a spring ring corrugated along the circumference.

Der in Fig. 6 schematisch wiedergegebene Aufbau des Antriebsstranges zwischen Motor 201 und Bolzen 205 ist in dem Gehäuse 220 der Antriebseinheit 200 untergebracht, wobei der Bolzen 205 aus der Vorderseite des Gehäuses 220 in einem Langloch 213 vorsteht, wie dies Fig. 5 zeigt. In dem Gehäuse 220 ist auch die nicht dargestellte Ansteuerelektronik für die Steuerung des Motors 201 untergebracht.The schematically illustrated in Fig. 6 structure of the drive train between the motor 201 and bolt 205 is housed in the housing 220 of the drive unit 200, wherein the bolt 205 protrudes from the front of the housing 220 in a slot 213, as shown in FIG. In the housing 220 and the drive electronics, not shown, for the control of the motor 201 is housed.

Auf der Vorderseite des Gehäuses 220 ist in einer Bohrung eine Lagerkugel 216 (Fig. 5) angeordnet, die federbeaufschlagt ist und beim Zusammenbau von Antriebseinheit und Pumpeneinheit 100 zentrisch an der Rückseite des Steuerkükens 3 zum Anliegen kommt, um das Steuerküken mit einer vorgegebenen Anlagekraft in der konischen Bohrung des Ventilblocks in Achsrichtung zu halten. Die angedeutete, die Lagerkugel 216 beaufschlagende Feder 217 kann durch eine nicht dargestellte Einstelleinrichtung in ihrer Anpresskraft so verändert werden, dass die Lagerkugel 216 mit einer vorgegebenen Anpresskraft an der ebenen Rückseite des Steuerkükens anliegt. Durch die Anlage der Lagerkugel an der ebenen Fläche des Steuerkükens werden die Reibungskräfte minimiert.On the front side of the housing 220, a bearing ball 216 (FIG. 5) is arranged in a bore, which is spring-loaded and concentrically abuts the back of the control block 3 during assembly of the drive unit and pump unit 100 in order to provide the control chick with a predetermined contact force to hold the conical bore of the valve block in the axial direction. The indicated, the bearing ball 216 acting spring 217 can be changed by an adjusting device, not shown in their contact force so that the bearing ball 216 rests with a predetermined contact pressure on the flat rear side of the control block. By applying the bearing ball on the flat surface of the control block, the frictional forces are minimized.

Damit die Antriebseinheit 200 schnell von der Pumpeneinheit 100 gelöst werden kann, sind am Gehäuse 220 Spannelemente 230 in der Form von verschwenkbaren Haken an den gegenüberliegenden Seiten angebracht, die mit Stiften 40 zusammenwirken, die seitlich an der Basisplatte 1 der Pumpeneinheit 100 abstehen. An der Vorderseite des Gehäuses 220 sind beispielsweise vier Passstifte 231 angebracht, die in entsprechende Passbohrungen 41 an der Basisplatte 1 der Pumpeneinheit 100 eingreifen. Die hakenförmigen Spannelemente 230 können auch durch einen einzelnen Spannbügel ersetzt werden, der die Antriebseinheit 200 mit der Pumpeneinheit 100 verbindet.In order for the drive unit 200 to be released quickly from the pump unit 100, clamping elements 230 in the form of pivotable hooks on the opposite sides are attached to the housing 220 and cooperate with pins 40 projecting laterally from the base plate 1 of the pump unit 100. At the front of the housing 220, for example, four dowel pins 231 are mounted, which engage in corresponding fitting holes 41 on the base plate 1 of the pump unit 100. The hook-shaped clamping elements 230 can also be replaced by a single clamping bracket, which connects the drive unit 200 to the pump unit 100.

Durch diesen Aufbau kann die Pumpeneinheit 100 schnell von der Antriebseinheit 200 gelöst werden, so dass die Pumpeneinheit z. B. in einem Autoklaven bei höheren Temperaturen sterilisiert werden kann. Hierbei kann die Pumpeneinheit in kurzer Zeit demontiert werden, wobei alle medienführenden Bauteile wie Kolben, Zylinderrohre und Steuerküken für Reinigungszwecke frei zugänglich sind. In entsprechender Weise kann die Pumpeneinheit 100 über die Spannelemente 230 schnell mit der Antriebseinheit 200 gekoppelt werden, wobei der Zapfen 205 in die Bohrung 43 am Schieber 14 und der Exzenter 43 in die Ausnehmung 44 auf der Rückseite des Steuerkükens 3 eingreift. Dieser Eingriff wird durch in die Passbohrungen 41 der Basisplatte 1 eingreifenden Passstifte 231 geführt.By this structure, the pump unit 100 can be quickly released from the drive unit 200, so that the pump unit z. B. can be sterilized in an autoclave at higher temperatures. In this case, the pump unit can be dismantled in a short time, with all media-carrying components such as pistons, cylinder tubes and control chicks are freely accessible for cleaning purposes. In a corresponding manner, the pump unit 100 can be coupled quickly to the drive unit 200 via the clamping elements 230, wherein the pin 205 engages in the bore 43 on the slider 14 and the eccentric 43 in the recess 44 on the back of the control block 3. This engagement is performed by engaging in the mating holes 41 of the base plate 1 dowel pins 231.

Durch Anlage der Kolben 13 an der Umfangsfläche des Steuerkükens 3 ist die Dosierpumpe so aufgebaut, dass sich möglichst keine Toträume ergeben. Sollte durch die unten liegenden Ansaugbohrungen 4 Luft angesaugt werden, so steigt diese mit dem Förderstrom nach oben zu den Abgabebohrungen 5, wobei eventuell vorhandene Luftblasen durch die Schwenkbewegung des Steuerkükens 3 während des Umschaltens von Förder- auf Ansaughub beschleunigt zu den Abgabebohrungen bewegt werden.By conditioning the piston 13 on the peripheral surface of the control block 3, the metering pump is constructed so that there are no possible dead spaces. If air is to be sucked in through the lower intake bores 4, it will rise with the delivery flow upwards to the delivery bores 5, whereby possibly present air bubbles will be accelerated to the discharge bores by the pivoting movement of the control plug 3 during the switchover from delivery to intake stroke.

Bei dem beschriebenen Ausführungsbeispiel wird das Steuerküken 3 umgeschaltet, sobald die Kolben 13 ihren Endhub erreicht haben, so dass die Antriebsrichtung des Schiebers 14 und das Steuerküken 3 im Wesentlichen gleichzeitig umgestellt werden. Durch die Trennung der Umsteuerung des Motors durch die Endschalter einerseits und die Umsteuerung des Kükens durch die Anschlagstifte 17 andererseits ist es auch möglich, durch Verstellen der Endschalter 206 und 207 die Antriebsrichtung des Schiebers 14 umzustellen, ohne dass zugleich das Steuerküken 3 umgeschaltet wird.In the described embodiment, the control chick 3 is switched as soon as the pistons 13 have reached their final stroke, so that the drive direction of the slide 14 and the control chick 3 are changed over substantially simultaneously. By separating the reversal of the motor by the limit switch on the one hand and the reversal of the plug by the stop pins 17 on the other hand, it is also possible to adjust by adjusting the limit switches 206 and 207, the drive direction of the slider 14, without at the same time the control chicks 3 is switched.

Es sind verschiedene Abwandlungen der beschriebenen Bauweise möglich. So kann anstelle der beschriebenen drei Einzelpumpen auch nur eine einzelne Pumpe mit zwei Zylinderrohren und zwei gegenüberliegenden Kolben vorgesehen sein. Ebenso können die Zylinderrohre 11 mehrerer Einzelpumpen zu einem Zylinderblock zusammengefasst sein, der in der beschriebenen Weise am Ventilblock 2 anliegend gehalten wird.There are various modifications of the construction described possible. Thus, instead of the described three individual pumps, only a single pump with two cylinder tubes and two opposing pistons can be provided. Likewise, the cylinder tubes 11 of a plurality of individual pumps can be combined to form a cylinder block, which is held in the manner described on the valve block 2 fitting.

Claims (10)

  1. A metering pump having opposing pistons (13, 13') guided in cylinders (11, 11') and connected to one another by a slide (14) which is moved reciprocatingly by a drive motor (201), wherein a switching means (3) is arranged in a valve block (2) between the pistons (13, 13') and alternately connects the opposing cylinder spaces with an intake opening (4) and an output opening (5).
  2. Metering pump comprising
    two groups of pistons (13, 13') guided in cylinders (11, 11'),
    a slide (14) which is connected to the two groups of pistons, is moved reciprocatingly by a drive motor (201), and which moves the groups of pistons reciprocatingly, and a switching means (3) arranged between the two groups of pistons,
    which alternately connects the cylinders of the two groups with an intake opening (4) and an output opening (5),
    wherein the switching means is actuated by the slide (14).
  3. Metering pump according to claim 1 or 2, in which the switching means is formed as a stopcock (3) which is rotatable in the valve block (2) and is provided on the circumference with grooves (6, 7), which are spaced from one another at diametrically opposite positions by ridges (8, 8'),
    wherein the one groove (6) communicates with a cylinder bore (9) in the valve block (2) and the other groove (7) communicates with a cylinder bore (10) formed in the valve block opposite, and by means of the swivelling back and forward of the stopcock (3), the one groove communicates with the intake opening (4) formed in the valve block, while the other groove communicates with the output opening (5) formed in the valve block, and vice versa.
  4. Metering pump according to claim 2, wherein spaced stops (17, 17') are provided at the slide (14), which act on a lever (18) mounted at the stopcock (3) in the area of the end positions of the pistons for switching the stopcock.
  5. Metering pump according to claim 2, wherein at the lever (18) a snap-action device (19, 20) is formed, by means of which the stopcock (3) is acceleratedly swivelled when a stop (17) contacts the lever (18).
  6. Metering pump according to the preceding claims, wherein a plurality of cylinder tubes (11, 11') is arranged adjacent one another at the valve block (2) and a corresponding plurality of pistons (13, 13') is mounted adjacent one another at the slide (14).
  7. Metering pump according to the preceding claims, wherein the valve block (2) having cylinder tubes (11) and slide (14) is mounted on a base plate (1) for forming a pump unit (100), which is releasably connected to a block-shaped drive unit (200).
  8. Metering pump according to claim 7, wherein aligning pins (231) protrude at the block-shaped drive unit (200), which engage in aligned bores (41) at the base plate (1) of the pump unit (100).
  9. Metering pump according to claim 8, wherein at the drive unit (200) at least one tensioning piece (230) is mounted, which cooperates with a corresponding engagement element (40) at the base plate (1).
  10. Metering pump according to claim 7, wherein at the drive unit (200) a bolt (205) protrudes, from which a nut (204) protrudes which is engaged with a threaded spindle (203), and which engages in a bore (43) of the slide (14) at the pump unit (100).
EP02776914A 2001-07-20 2002-07-19 Dosing pump Expired - Lifetime EP1412639B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10135495A DE10135495A1 (en) 2001-07-20 2001-07-20 metering
DE10135495 2001-07-20
PCT/EP2002/008084 WO2003010435A1 (en) 2001-07-20 2002-07-19 Dosing pump

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Publication Number Publication Date
EP1412639A1 EP1412639A1 (en) 2004-04-28
EP1412639B1 true EP1412639B1 (en) 2007-03-07

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US (1) US20040161349A1 (en)
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AT (1) ATE356292T1 (en)
DE (2) DE10135495A1 (en)
WO (1) WO2003010435A1 (en)

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DE10360806A1 (en) * 2003-12-23 2005-07-28 Micro Mechatronic Technologies Ag metering

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DE50209667D1 (en) 2007-04-19
ATE356292T1 (en) 2007-03-15
WO2003010435A1 (en) 2003-02-06
EP1412639A1 (en) 2004-04-28
DE10135495A1 (en) 2003-02-06
US20040161349A1 (en) 2004-08-19

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