EP2194270B1 - Dosing pump - Google Patents
Dosing pump Download PDFInfo
- Publication number
- EP2194270B1 EP2194270B1 EP09013985.8A EP09013985A EP2194270B1 EP 2194270 B1 EP2194270 B1 EP 2194270B1 EP 09013985 A EP09013985 A EP 09013985A EP 2194270 B1 EP2194270 B1 EP 2194270B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metering pump
- valve
- pump
- crankshaft
- constructed
- 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.)
- Not-in-force
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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
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B7/00—Piston machines or pumps characterised by having positively-driven valving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- 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 with a crankshaft to whose drive an electric motor is provided.
- urea solution is a chemically aggressive and very fluid medium, which tends to crystallize
- membrane feed pumps are used to promote it.
- the urea solution does not come into contact with the drive units of the dosing pump.
- the delivery chamber is separated from the aggregate compartment by the diaphragm of the pump.
- the promotion takes place by an up and down stroke of the driven by a plunger membrane.
- the DE 38 27 489 Cl shows a metering pump with a motor having a motor-driven shaft which carries a Dosierexzenter.
- a diaphragm pump with a clamped membrane is provided, and the back of the diaphragm is connected to a plunger which bears against the metering eccentric.
- a suction channel and a riser are connected to the pump chamber.
- the suction channel is connected via a suction valve with a Dosierstoff sake here.
- the riser leads via a pressure valve to a connection that can be connected to a dosing point.
- a dosing system for dosing an aqueous urea solution for the aftertreatment of exhaust gases from internal combustion engines.
- This dosing system uses a peristaltic pump, which runs constantly during vehicle operation and builds up a pressure of eg 5 bar. In the pipes and systems is the urea. If the temperature falls below freezing point after the vehicle is parked, the system will freeze completely. Since not all components can withstand freezing, the urea solution must be sucked back after the vehicle is parked. This is done in the known systems by means of a 4/2-way valve, which reverses the conveying direction, or by reversing the conveying direction of the peristaltic pump.
- FIG. 12 shows a plan view of a preferred embodiment of a metering pump 22.
- a diaphragm pump 24 below a first valve 26, and above a second valve 28, which are driven synchronously with the diaphragm pump 24 but out of phase with it.
- the metering pump 22 is driven by a drive shaft 30 (FIG. Fig. 5 ), which is surrounded by a bearing tube 88.
- a bidirectional electronically commutated motor 34 To drive the shaft 30 is a bidirectional electronically commutated motor 34, the Fig. 5 schematically shows.
- This has a drive electronics 33, such as a full bridge circuit.
- This is controlled by an arrangement 35 which serves to decode the duty cycle pwm of a PWM signal which is fed via a line 31 and thereby to control the motor 34 with respect to the direction of rotation DIR and speed n.
- the duty cycle is referred to as pwm
- the following assignments result by way of example: pwm operating condition 0 ... 5% Not allowed 95 ... 100% Not allowed 5 ... 85% Dosing.
- a corresponding decoding circuit is described in detail in FIG EP 1413045 B1 , the contents of which are expressly referred to avoid length.
- an eccentric 36 is connected, which can be driven by the motor 34 bidirectionally, ie clockwise 38 and 53 in a counterclockwise direction, see. Fig. 1 ,
- the valves 26 and 28 are also opened by the rotation of the eccentric 36 depending on the angle of rotation and closed.
- the shaft 30 is mounted in two crankshaft bearings 42, 44, cf. Fig. 5 ,
- the eccentric 36 forms a connecting rod bearing, which serves, in operation, a plunger 46 of the pump 22 and the flexible membrane 49 connected to it in the direction of an arrow 47 (FIG. Fig. 1 ) to move back and forth.
- the membrane 49 is usually integral with the plunger 46 and also of an elastic material, such as a synthetic rubber.
- Fig. 1 There is a pump room 52 to the left of it.
- the pump chamber 52 is connected via a line 40 to the left port 62 of the first valve 26, the lower port 64 is connected via a line 66 to a reservoir 68.
- This may, for example, be an aqueous urea solution.
- the first valve 26 is identical to the second valve 28. It is a diaphragm valve with a diaphragm 70 and a closing body 71, which is guided in a bore 73 of the valve housing.
- a plunger 75 which is connected in a suitable manner with a connecting rod 26 and articulated via a ball bearing 78 at the lower right corner of the triangular part 43.
- a ball bearing 78 is sufficient in some cases, an elastic connection of the plunger 76 with the part 43rd
- the diaphragm 70 When, as the shaft 30 rotates, the member 43 performs eccentric movements, the diaphragm 70 is alternately moved up and down. When the closing body 71 moves down, it closes the bore 73, as in FIG Fig. 2 shown, so that no liquid can be sucked from the container 68.
- the processes at the upper valve 28 are mirror images.
- the closing body 71 'of the valve 28 is driven by a connecting rod 80 and a ball bearing 78'.
- liquid is sucked out of the reservoir and fed to a nozzle 82.
- liquid is sucked out of the nozzle 82 and pumped back to the reservoir 68.
- the membrane 70, 70 'of the valves 26, 28 may be e.g. be made of a synthetic rubber.
- Fig. 5 shows the feed pump 24.
- the drive motor 34 has a base housing 84, in which the second bearing 42 (for the shaft 30) is arranged.
- the shaft 30 drives the eccentric 36, on which the inner ring 37 of a ball bearing 86 is arranged, the outer ring 39 is fixed in the triangular part 43 so that it performs an eccentric movement in operation, through which the diaphragm piston 49 and the closing members 71, 71 'out of phase driven.
- the base housing 84 sits in Fig. 5 to the right in the bearing tube 88, in which the shaft 30 is mounted by means of the two ball bearings 42 and 44.
- a rotor bell 90 is arranged, on the inside of a rotor magnet 92 is fixed, for. B. as shown, a ceramic magnet.
- stator 96 Within the magnet 92, and separated therefrom by a magnetic air gap 94, there is an inner stator 96 with a laminated core 98 and a stator winding assembly 100. This is associated with a printed circuit board 102 on which electronic components 104 for commutation and other control of the motor 34 are located. Also, there is arranged a plug contact 106 for the electrical connection and for the supply of a PWM signal PWM. With this signal, as indicated, direction of rotation DIR and speed n of the motor 34 are controlled.
- the circuit board 102 is disposed around the bearing tube 88 as in FIG Fig. 5 shown.
- the housing 88 is connected to a carrier plate 108.
- the Fig. 6 to 9 show a second embodiment, namely a metering pump 122, which has a structure that is about comparable to a series pump.
- Fig. 6 shows a side view of the pump housing 130 having a lid 132, a central portion 134, and a base portion 136, on which an electric motor 138 is shown schematically.
- This is here as an electronically commutated DC external rotor motor with an inner stator 140 ( Fig. 7 ) and an outer rotor 142, which drives a motor shaft 146 via its rotor bell 144, which in turn drives a pump shaft 150 via a coupling 148.
- the rotor magnet is designated 143.
- the membrane 160 is according to Fig. 9 made of a flexible plastic or a suitable other elastomer, for example rubber, and its edge 162 is clamped liquid-tight between the lid 132 and the middle part 134.
- the membrane 160 has on its underside an extension 164 which is suitably connected to a recess 166 of the connecting rod 158. Because of the elastic properties of the membrane 160 can usually account for a separate connecting rod bearing on the membrane 160, but may, especially in a very compact design, a connecting rod 158 may be necessary, which has a connecting rod bearing at both ends.
- the pump room 168 Above the diaphragm 160 is the pump room 168. Like Fig. 9 shows it is connected via two inclined bores 170 with an annular space 172 of a valve 171 having a closing member 173, which is driven by the eccentric 152 via a connecting rod bearing 174 and a connecting rod 176.
- the closing member 173 consists, as well as the diaphragm piston 160, of a suitable elastomeric material. Its outer edge 175 is liquid-tightly clamped between the lid 132 and the middle part 134.
- liquid may be drawn out of the nozzle 186, the valve 171, and the inclined bores 170 to prevent freezing in the winter.
- a further valve 171 ' is arranged to the left of the pump diaphragm 160, which may be of the same construction as the valve 171 and which is driven by the eccentric 156 via a connecting rod bearing 200 and a connecting rod 202.
- the annular space 172 'of the valve 171' is connected via two inclined bores 204 with the pump chamber 168, cf. Fig.
- the connecting part 184 ' is connected to a reservoir 208 via a line 206, and depending on the direction of rotation of the motor 141, liquid is sucked from the reservoir 208 and transported to the nozzle 186, or vice versa, liquid from the nozzle 186, the valve 171, the Pump chamber 168 and the valve 171 'transported to the reservoir 208 to protect the metering pump 122 in the cold from damage caused by freezing.
- Fig. 8 shows are located next to the motor 141 electrical connection pins 210, which serve to supply power and to control the speed and direction by means of a PWM signal, as in Fig. 1 to 5 already described.
- the valves 171 and 171 ' operate in push-pull, that is, when the valve 171 is opened, the valve 171' is closed, and vice versa, so that the conveying direction of the metering pump 122 is controlled by the direction of rotation of the motor 141.
Description
Die Erfindung betrifft eine Dosierpumpe mit einer Kurbelwelle, zu deren Antrieb ein Elektromotor vorgesehen ist.The invention relates to a metering pump with a crankshaft to whose drive an electric motor is provided.
Beim Verbrennungsvorgang in Dieselmotoren entstehen giftige Abgase und Stickoxide NOx. Zur Beseitigung bzw. Zersetzung dieser Stickoxide ist es bekannt, mittels einer Dosierpumpe in den vorgereinigten Abgasstrom eine Harnstofflösung einzuspritzen. Ammoniak, welches auf diese Weise freigesetzt wird, wandelt in einem nachgeschalteten SCR-Katalysator bis zu 80 % der Stickoxide in unschädlichen Stickstoff und in Wasser um.The combustion process in diesel engines produces toxic exhaust gases and nitrogen oxides NOx. For the removal or decomposition of these nitrogen oxides, it is known to inject a urea solution by means of a metering pump into the pre-cleaned exhaust gas stream. Ammonia, which is released in this way, converts up to 80% of the nitrogen oxides into harmless nitrogen and water in a downstream SCR catalytic converter.
Da eine Harnstofflösung ein chemisch aggressives und sehr dünnflüssiges Medium ist, das zum Auskristallisieren neigt, werden zu seiner Förderung Membranförderpumpen verwendet. Bei diesen kommt die Harnstofflösung nicht mit den Antriebsaggregaten der Dosierpumpe in Berührung. Der Förderraum ist vom Aggregateraum durch die Membran der Pumpe getrennt. Üblicherweise erfolgt die Förderung durch einen Auf- und Abhub der mittels eines Stößels angetriebenen Membran.Since a urea solution is a chemically aggressive and very fluid medium, which tends to crystallize, membrane feed pumps are used to promote it. In these, the urea solution does not come into contact with the drive units of the dosing pump. The delivery chamber is separated from the aggregate compartment by the diaphragm of the pump. Usually, the promotion takes place by an up and down stroke of the driven by a plunger membrane.
Die
Aus der
Es ist eine Aufgabe der Erfindung, eine neue Dosierpumpe bereit zu stellen.It is an object of the invention to provide a new metering pump.
Diese Aufgabe wird nach der Erfindung gelöst durch den Gegenstand des Anspruchs 1. Es gelingt so, eine Dosierpumpe bereit zu stellen, die in ihrer einen Drehrichtung die zu dosierende Flüssigkeit aus dem Vorratsbehälter ansaugt und zum Verbraucher transportiert, und die in ihrer anderen Drehrichtung diese Flüssigkeit aus den Leitungen absaugt und zum Vorratsbehälter zurück transportiert.This object is achieved according to the invention by the subject-matter of claim 1. It is thus possible to provide a metering pump which sucks in one direction of rotation the liquid to be metered from the reservoir and transported to the consumer, and in their other direction of rotation this liquid sucks from the lines and transported back to the reservoir.
Dadurch vermeidet man die Probleme, die sich in der Praxis bei Verwendung eines 4/2-Wege-Ventils ergeben haben, d. h. nach dem Abschalten der Brennkraftmaschine wird während einer vorgegebenen Zeitspanne einfach die Drehrichtung des Elektromotors umgekehrt. Da dieser keinen Kontakt zu der Harnstofflösung hat, welche verwendet wird, ist die Umkehr der Strömungsrichtung mit seiner Hilfe robust, da solche Motoren eine sehr hohe Lebensdauer haben. Hierdurch wird vermieden, dass bei Kälte die Harnstofflösung gefriert, da es mit einem solchen Motor sehr einfach ist, Pumpe und Ventile weitgehend leer zu pumpen, wenn keine Harnstofflösung eingespritzt wird.This avoids the problems that have arisen in practice when using a 4/2-way valve, d. H. after switching off the internal combustion engine, the direction of rotation of the electric motor is simply reversed for a predetermined period of time. Since this has no contact with the urea solution, which is used, the reversal of the flow direction with his help is robust, since such motors have a very long life. This avoids that the urea solution freezes in the cold, since it is very easy with such a motor to pump pump and valves largely empty when no urea solution is injected.
Weitere Einzelheiten und vorteilhafte Weiterbildungen der Erfindung ergeben sich aus dem im folgenden beschriebenen und in der Zeichnung dargestellten, in keiner Weise als Einschränkung der Erfindung zu verstehenden Ausführungsbeispiel, sowie aus den Unteransprüchen. Es zeigt:
- Fig. 1
- eine Draufsicht auf eine Ausführungsform einer als Membranpumpe ausgebildeten Dosierpumpe einschließlich der zugehörigen Steuerventile; die Dosierpumpe wird angetrieben über ein Pleuellager, das in
Fig. 1 in derStellung 0° dargestellt ist, - Fig. 2
- die Pumpe nach
Fig. 1 , aber nach einer Drehung um 90° entgegen dem Uhrzeigersinn, bezogen auf die Stellung nachFig. 1 , - Fig. 3
- die Pumpe nach
Fig. 1 und2 , aber nach einer Drehung um 180° entgegen dem Uhrzeigersinn, bezogen auf die Stellung nachFig. 1 , - Fig. 4
- die Pumpe nach den
Fig. 1 bis 3 , aber nach einer Drehung um 270° entgegen dem Uhrzeigersinn, bezogen auf die Stellung nachFig. 1 , - Fig. 5
- eine Darstellung des Antriebs der Pumpe nach den
Fig. 1 bis 4 mittels eines bidirektionalen, elektronisch kommutierten Gleichstrommotors, dessen Drehrichtung DIR und Drehzahl n durch das Tastverhältnis pwm eines PWM-Signals gesteuert werden, welches dem Motor zugeführt wird, - Fig. 6
- eine zweite Ausführungsform einer Dosierpumpe gemäß der Erfindung, gesehen in Richtung des Pfeiles VI der
Fig. 7 , - Fig. 7
- einen Schnitt, gesehen längs der Linie VII-VII der
Fig. 6 , - Fig. 8
- eine Draufsicht von oben, gesehen in Richtung des Pfeiles VIII der
Fig. 7 , und - Fig. 9
- einen vergrößerten Ausschnitt aus
Fig. 7 zur Erläuterung von Einzelheiten.
- Fig. 1
- a plan view of an embodiment of a metering pump designed as a diaphragm pump including the associated control valves; the dosing pump is driven by a connecting rod bearing, which is in
Fig. 1 is shown in theposition 0 °, - Fig. 2
- the pump after
Fig. 1 but after a 90 ° counterclockwise rotation, relative to the position afterFig. 1 . - Fig. 3
- the pump after
Fig. 1 and2 but after a 180 ° counterclockwise rotation, relative to the position afterFig. 1 . - Fig. 4
- the pump after the
Fig. 1 to 3 but after a 270 ° counterclockwise rotation, relative to the position afterFig. 1 . - Fig. 5
- a representation of the drive of the pump after the
Fig. 1 to 4 by means of a bidirectional, electronically commutated DC motor whose direction of rotation DIR and speed n are controlled by the duty cycle pwm of a PWM signal which is supplied to the motor, - Fig. 6
- a second embodiment of a metering pump according to the invention, as seen in the direction of arrow VI of
Fig. 7 . - Fig. 7
- a section seen along the line VII-VII of
Fig. 6 . - Fig. 8
- a top view, seen in the direction of arrow VIII of
Fig. 7 , and - Fig. 9
- an enlarged section
Fig. 7 to explain details.
Die Dosierpumpe 22 wird angetrieben durch eine Antriebswelle 30 (
Eine entsprechende Decodierschaltung ist ausführlich beschrieben in der
Mit der Welle 30 ist ein Exzenter 36 verbunden, der durch den Motor 34 bidirektional, also im Uhrzeigersinn 38 und in einer Richtung 53 entgegen dem Uhrzeigersinn angetrieben werden kann, vgl.
Auf dem Exzenter 36 befindet sich ein Kugellager 41, dessen Außenring in einem dreieckförmigen Teil 43 befestigt ist. Dieses Dreieck hat eine linke Spitze 45, an welcher der Stößel 46 befestigt ist, d.h. wenn sich die Welle 30 dreht, führt das Teil 43 eine hin - und hergehende Bewegung in Richtung des Doppelpfeils 47 aus.On the eccentric 36 is a
Mit dem Stößel 46 ist die Membran 49 verbunden, deren äußerer Rand 51 im Gehäuse der Pumpe 24 abgedichtet befestigt ist. Die Membran 49 ist gewöhnlich einstückig mit dem Stößel 46 und ebenfalls aus einem elastischen Werkstoff, z.B. einem synthetischen Gummi. In
Wenn sich bei Drehung der Welle 30 die Membran 49 der Pumpe 24 nach rechts bewegt, wird Flüssigkeit in den Pumpenraum 52 angesaugt, und wenn sich die Membran 49 nach links bewegt, wird Flüssigkeit aus dem Pumpenraum 52 ausgepresst.As the
Wie
Das erste Ventil 26 ist identisch mit dem zweiten Ventil 28. Es ist ein Membranventil mit einer Membran 70 und einem Schließkörper 71, der in einer Bohrung 73 des Ventilgehäuses geführt ist. Zur Bewegung des Schließkörpers 71 dient ein Stößel 75, der in geeigneter Weise mit einer Pleuelstange 26 verbunden und über ein Kugellager 78 am rechten unteren Eck des dreieckförmigen Teiles 43 angelenkt ist. Statt des Kugellagers 78 genügt in manchen Fällen auch eine elastische Verbindung des Stößels 76 mit dem Teil 43The
Wenn bei der Drehung der Welle 30 das Teil 43 Exzenterbewegungen durchführt, wird die Membran 70 abwechselnd nach oben und nach unten bewegt. Wenn sich der Schließkörper 71 nach unten bewegt, verschließt er die Bohrung 73, wie in
Bewegt sich der Schließkörper 71 nach oben, wie in
Die Abläufe beim oberen Ventil 28 sind spiegelbildlich. Der Schließkörper 71' des Ventils 28 wird über eine Pleuelstange 80 und eine Kugellager 78' angetrieben.The processes at the
Wie man sieht, wird bei der Drehrichtung 53, also entgegen dem Uhrzeigersinn, Flüssigkeit aus dem Vorratsbehälter angesaugt und einer Düse 82 zugeführt. Umgekehrt wird bei der Drehrichtung 38, also im Uhrzeigersinn, Flüssigkeit aus der Düse 82 abgesaugt und zum Vorratsbehälter 68 zurückgepumpt. Die Membran 70, 70' der Ventile 26 bzw. 28 kann z.B. aus einem synthetischen Gummi hergestellt sein.As can be seen, in the direction of
Das Basisgehäuse 84 setzt sich in
Innerhalb des Magneten 92, und von diesem durch einen magnetischen Luftspalt 94 getrennt, befindet sich ein Innenstator 96 mit einem Blechpaket 98 und einer Statorwicklungsanordnung 100. Dieser ist eine Leiterplatte 102 zugeordnet, auf der sich elektronische Bauteile 104 für die Kommutierung und sonstige Steuerung des Motors 34 befinden. Auch ist dort ein Steckkontakt 106 für den elektrischen Anschluss und für die Zufuhr eines PWM-Signals PWM angeordnet. Mit diesem Signal werden, wie angegeben, Drehrichtung DIR und Drehzahl n des Motors 34 gesteuert. Die Leiterplatte 102 ist um das Lagerrohr 88 herum angeordnet, wie in
Da die Rotorglocke 90 nach außen hin zugänglich ist, sieht man im Betrieb sofort, ob die Pumpe sich dreht oder blockiert ist.Since the
Die
Auf der Pumpenwelle 150 befinden sich drei Exzenter 152, 154, 156 mit gegeneinander versetzter Phasenlage, von denen der mittlere Exzenter 154 - über ein Pleuellager 157 und eine Pleuelstange 158 - eine Pumpenmembran 160 antreibt.On the
Die Membran 160 ist gemäß
Die Membran 160 hat auf ihrer Unterseite einen Fortsatz 164, der in geeigneter Weise mit einer Ausnehmung 166 der Pleuelstange 158 verbunden ist. Wegen der elastischen Eigenschaften der Membran 160 kann meistens ein separates Pleuellager an der Membran 160 entfallen, doch kann, besonders bei sehr kompakter Bauweise, auch eine Pleuelstange 158 notwendig sein, die an beiden Enden ein Pleuellager hat.The
Oberhalb der Membran 160 befindet sich der Pumpenraum 168. Wie
Wenn die Pleuelstange 176 durch die Drehung des Exzenters 152 nach oben bewegt wird, legt sich das Schließglied 173 gegen einen Ventilsitz 178 und verschließt dadurch eine in diesem vorgesehene zentrale Bohrung 179 (
Wird dagegen das Schließglied 173 durch seine Pleuelstange 176 in
Umgekehrt kann, wenn sich die Pumpmembran 160 nach unten bewegt und das Ventil 171 geöffnet ist, Flüssigkeit aus der Düse 186, dem Ventil 171, und den Schrägbohrungen 170 abgesaugt werden, um im Winter ein Einfrieren zu verhindern.Conversely, as the pumping
Wie
Wie
Naturgemäß sind im Rahmen der vorliegenden Erfindung vielfache Abwandlungen und Modifikationen möglich. Z.B. ist je nach den Anforderungen auch die Verwendung eines Bürstenmotors oder eines Innenläufermotors möglich.Naturally, in the context of the present invention multiple modifications and modifications possible. For example, depending on the requirements, the use of a brush motor or an internal rotor motor is possible.
Claims (12)
- Metering pump (22)
having a bidirectional electric motor (34; 141),
a first connecting line (40; 204) and a second connecting line (60; 170),
wherein
the metering pump (22) has a crankshaft (30; 150), for driving which the bidirectional electric motor (34; 141) is provided,
a diaphragm (49; 160) that can be driven by an eccentric (36; 154) belonging to the crankshaft (30; 150) is provided, which forms a wall of a pump chamber (52; 168) and performs sucking and forcing movements in an alternating manner when in operation,
wherein the first connecting line (40; 204) and the second connecting line (60; 170) are connected to the pump chamber (52; 168),
of which lines the first connecting line (40; 204) is connected to a first valve (26; 171') which is controlled by the rotational position of the crankshaft (30; 150) and which is constructed for the purpose of controlling the connection to a storage container (68; 208) for a liquid which is to be metered;
and the second connecting line (60; 170) is connected to a second valve (28; 171) which is controlled by the rotational position of the crankshaft (30; 150) and which is constructed for the purpose of controlling the connection to a consumer (80). - Metering pump (22) according to claim 1, in which the direction of rotation of the electric motor (34; 141) can be controlled by a PWM signal (PWM), in order to permit switching-over of the metering pump (22) from pumping to sucking or vice versa.
- Metering pump (22) according to claim 1 or 2, in which the rotational speed of the electric motor (34; 141) can be controlled by a PWM signal (PWM).
- Metering pump (22) according to one of the preceding claims, having an electric motor (34; 141) in which the direction of rotation and/or the rotational speed can be controlled by the magnitude of the pulse-width modulation (pwm) of a PWM signal.
- Metering pump (22) according to one of the preceding claims, in which the electric motor is constructed as an electronically commutated motor (34; 141).
- Metering pump (22) according to claim 5, in which the electronically commutated motor (34; 141) is constructed as an external rotor motor, in which the external rotor directly drives the crankshaft (30; 150).
- Metering pump (22) according to one of the preceding claims, in which the liquid to be metered is a urea solution.
- Metering pump (22) according to one of the preceding claims, in which the eccentric (36) forms a connecting rod bearing which is provided for driving a plunger (46) connected to the diaphragm (49).
- Metering pump (22) according to claim 8, in which the connecting rod bearing is also constructed for controlling at least one of the two valves (26, 28).
- Metering pump (22) according to one of claims 1 to 7, in which the diaphragm (160) delimits the pump chamber (168) and the crankshaft (150) is constructed for the purpose of
driving the diaphragm (160) and the closing member (173) of the second valve (171) after the manner of an in-line pump via eccentrics (152, 154, 156) that can be driven via the said crankshaft (150). - Metering pump (22) according to claim 10, in which one of the eccentrics (156) is constructed for the purpose of driving the closing member of the first valve (171').
- Metering pump (22) according to claim 11, in which the eccentric (152) of the second valve (171) and the eccentric (156) of the first valve (171') are so arranged that the second valve (171) is open when the first valve (171') is closed and vice versa, in order to make it possible to control the direction of delivery of the metering pump (22) by controlling the direction of rotation of the bidirectional electric motor (141) that drives the crankshaft (150).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202008016674 | 2008-12-05 |
Publications (3)
Publication Number | Publication Date |
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EP2194270A2 EP2194270A2 (en) | 2010-06-09 |
EP2194270A3 EP2194270A3 (en) | 2011-09-21 |
EP2194270B1 true EP2194270B1 (en) | 2013-06-12 |
Family
ID=41319473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09013985.8A Not-in-force EP2194270B1 (en) | 2008-12-05 | 2009-11-07 | Dosing pump |
Country Status (2)
Country | Link |
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EP (1) | EP2194270B1 (en) |
DE (1) | DE202009016915U1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9453507B2 (en) | 2011-03-19 | 2016-09-27 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Metering system |
US10584694B2 (en) * | 2016-02-09 | 2020-03-10 | Oridion Medical 1987 Ltd. | Miniature diaphragm pump with enlarged operation time |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011088679A1 (en) * | 2011-12-15 | 2013-06-20 | Robert Bosch Gmbh | pump unit |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3827489C1 (en) * | 1988-08-12 | 1989-10-12 | Gruenbeck Wasseraufbereitung Gmbh, 8884 Hoechstaedt, De | |
DE10117418A1 (en) * | 2001-04-06 | 2002-10-17 | Knf Flodos Ag Sursee | Oscillating positive displacement pump |
WO2003012971A1 (en) | 2001-08-01 | 2003-02-13 | Papst-Motoren Gmbh & Co Kg | Method for determining the numerical value for the duration of a periodically repeated pulse signal, and device for carrying out said method |
DE102004050023A1 (en) * | 2004-10-13 | 2006-04-27 | L'orange Gmbh | Device for the metered injection of a reducing agent into the exhaust gas tract of an internal combustion engine |
DE102004054238A1 (en) * | 2004-11-10 | 2006-05-11 | Robert Bosch Gmbh | Dosing system and method for operating a dosing system |
DE102005060127A1 (en) * | 2005-12-16 | 2007-06-21 | Daimlerchrysler Ag | Aerosol system, to give a dosed delivery of an air/liquid mixture into a motor exhaust, has a heater at the air feed and a mixing zone with separate air and liquid supply lines |
-
2009
- 2009-11-07 EP EP09013985.8A patent/EP2194270B1/en not_active Not-in-force
- 2009-12-04 DE DE202009016915U patent/DE202009016915U1/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9453507B2 (en) | 2011-03-19 | 2016-09-27 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Metering system |
US10584694B2 (en) * | 2016-02-09 | 2020-03-10 | Oridion Medical 1987 Ltd. | Miniature diaphragm pump with enlarged operation time |
Also Published As
Publication number | Publication date |
---|---|
EP2194270A3 (en) | 2011-09-21 |
DE202009016915U1 (en) | 2010-04-29 |
EP2194270A2 (en) | 2010-06-09 |
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