EP2362100B2 - Metering pump aggregate and method for controlling same - Google Patents
Metering pump aggregate and method for controlling same Download PDFInfo
- Publication number
- EP2362100B2 EP2362100B2 EP10001643.5A EP10001643A EP2362100B2 EP 2362100 B2 EP2362100 B2 EP 2362100B2 EP 10001643 A EP10001643 A EP 10001643A EP 2362100 B2 EP2362100 B2 EP 2362100B2
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- stroke
- speed
- increased
- metering pump
- stroke speed
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- 238000006073 displacement reaction Methods 0.000 claims description 31
- 230000004913 activation Effects 0.000 claims 1
- 230000033001 locomotion Effects 0.000 description 8
- 239000012528 membrane Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Images
Classifications
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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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
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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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0081—Special features systems, control, safety measures
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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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
Definitions
- the invention relates to a metering pump unit according to the preamble of claim 1.
- Known metering pump units have a metering space which is delimited on one side by a displacement body, for example in the form of a membrane.
- the displacer body can change the volume of the dosing chamber, whereby a pumping effect is achieved.
- a suitable linear drive is provided for driving the displacement body.
- this is a rotationally driving drive motor in the form of a stepper motor, which sets a connecting rod in linearly oscillating motion via an eccentric.
- Check valves are arranged on the inlet and outlet sides of the metering chamber, which prevent the medium to be pumped from flowing back into the metering chamber in the suction stroke and prevent the medium from being pressed into the suction line instead of the pressure line.
- WO 03 / 054392A1 discloses a metering pump which has an electric motor drive which can be variably controlled in its speed and direction of rotation. This control enables the suction stroke to be carried out faster than the pressure stroke.
- EP 1 278 961 B1 discloses a pump for conveying liquid, which is designed as a piston pump, wherein the piston can be moved so that the speed increases during the pressure stroke towards the center of the pressure stroke and then reduced again at the end of the pressure stroke.
- US 4,131,393 discloses a fluid pump system in which the suction stroke is started at a slower speed to avoid cavitation.
- the metering pump unit has, in a known manner, a metering space, on which a displacement body is arranged adjacent.
- the displacement body thus forms a wall of the metering chamber and can change the volume of the metering chamber by its movement.
- a displacer drive is provided for moving the displacer body and can be controlled or regulated via a control device.
- the control device can be used in particular to specify the speed, operating time and direction of movement of the displacement drive in order to set or regulate the volume to be metered by actuating the displacement drive.
- the displacer drive is preferably an electric drive motor, in particular a stepper motor, which can be controlled very precisely in order to selectively adjust the stroke length and / or stroke speed of the displacer body in order to maintain the quantity to be metered and the metering speed in accordance with predetermined values.
- the drive motor can be a linear motor or a rotating electric motor, the rotary movement then being converted into a linear movement of the displacement body by means of suitable gear means, for example a crank drive, a cam drive, an eccentric or a spindle.
- suitable gear means for example a crank drive, a cam drive, an eccentric or a spindle.
- an EC motor, a servo motor or another suitable electrical drive motor can also be used as the drive motor.
- control device and the displacement drive are designed such that the travel speed of the displacement body can be changed even during a pressure stroke. This is done by changing the speed of the displacement drive, e.g. B. the speed or speed of rotation of the drive motor.
- the control device is also designed such that it selects a special driving or driving characteristic of the displacement drive for certain desired flow rates to be generated by the metering pump and controls the displacement drive accordingly.
- a special drive characteristic is designed in such a way that the pressure stroke of the displacement body is started with a first increased stroke speed and then continued with a second, lower stroke speed.
- the control device is designed such that it, at least for certain flow rates to be generated by the metering pump, the displacement drive, for. B. controls a drive motor such that a pressure stroke of the displacer begins at a first increased stroke speed and then continues at the second lower stroke speed. It is thereby achieved that the check valve to the suction channel is closed quickly and reliably in the case of a pressure stroke for, in particular, low flow rates, so that there are no or only slight leakage losses and thus a high metering accuracy is achieved even with low flow rates.
- the control device determines the stroke speed by reducing the speed of the displacement drive, i.e. H. e.g. B. the speed of the drive motor is reduced, so that overall only a lower flow rate is achieved in the pressure stroke.
- control device is designed in such a way that it executes the special drive characteristic described above and below in the pressure stroke
- control device can also be designed such that it additionally has the special drive strategy described above or below in the suction stroke.
- the control device is thus preferably designed such that it controls the displacement drive for flow rates below a predetermined limit value in such a way that a pressure stroke of the displacement body begins with a first increased stroke speed and then continues with a second lower stroke speed.
- the exact limit value can depend on the design of the dosing chamber and in particular on the check valves used.
- the described special driving characteristics of the displacement body are to be used, according to which the lifting stroke begins and the pressure stroke is then continued with a stroke speed that is reduced compared to this increased stroke speed .
- the corresponding specific limit values are specified for the control device or are stored in a memory of the control device.
- the stroke speed of the displacement drive is changed by appropriate control by means of the control device, so that the displacement drive can be operated at different speeds or speeds according to the control device.
- the motor can carry out a predetermined number of individual steps in a specific time interval. The number of individual steps per time interval can be predetermined by the control device in order to change the speed of the drive motor.
- the control device is designed in such a way that the first increased lifting speed is set faster than is required for a desired delivery flow. This ensures that, compared to the initial rapid pressure increase which would occur at the stroke speed otherwise required for the desired delivery flow, a rapid initial pressure increase is exerted on the medium to be pumped, which leads to a reliable closing of the valves, in particular the valve in the suction channel leads.
- the stroke speed for an actually higher flow rate must be selected at the beginning of the pressure stroke. This is then compensated for by the later reduction in the stroke speed in order to achieve a lower delivery volume flow overall over the total stroke than is achieved at the start of the pressure stroke with the higher stroke speed.
- the control device is designed in such a way that the second, lower stroke speed is set slower than is required for a desired delivery flow.
- the target flow rate can be achieved on average over the entire pressure stroke.
- the control device is designed in such a way that it selects or calculates the first increased lifting speed and the second reduced lifting speed and the duration of the partial stroke with the first lifting speed as a function of a predetermined desired flow rate so that an average flow rate is achieved over the entire pressure stroke , which corresponds to the desired flow rate.
- the duration with which the pressure stroke is operated at an increased stroke speed and the absolute values for the higher and, in contrast, the reduced stroke speed can be stored in the control device for certain desired delivery volume flows or can currently be stored for a selected desired delivery volume flow according to predetermined algorithms be calculated.
- the volume flow can also be monitored by suitable sensors during the pressure stroke, so that the stroke speed could also be adjusted to a specific desired value by the control device during the pressure stroke.
- 2% or more of the total pressure stroke becomes with the first increased lifting speed. More preferably, less than 20% of the total pressure stroke is carried out with the first increased stroke speed.
- the stroke does not have to be the maximum possible stroke, rather it can only be a shortened stroke. This is only a small part of the total stroke, so that the constant metering of the medium to be metered is only slightly impaired by the increased stroke speed at the beginning of the pressure stroke.
- the higher stroke speed at the beginning of the pressure stroke results in a higher dosing accuracy overall.
- the change in the lifting speed from the first increased lifting speed to the second lower lifting speed can be carried out in leaps and bounds or else in the form of a ramp. A change in several steps or stages or via a ramp with changing incline is also possible.
- the first increased stroke speed is more preferably greater than or equal to six strokes per minute, while the second lower stroke speed is preferably less than six strokes per minute.
- the first increased lifting speed can further preferably essentially correspond to the lifting speed in the suction stroke.
- the first increased lifting speed is expediently many times greater than the second lower lifting speed, preferably the first increased lifting speed is three times, according to a further preferred embodiment five times or seven times or more the second lower lifting speed.
- the metering pump unit has a drive housing 2 with a pump head 4 arranged thereon on the end face.
- the drive motor 6 drives an eccentric 10 via a gear 8.
- the eccentric 10 converts the rotating drive movement of the drive motor 6 into a linear movement of a connecting rod 12.
- the connecting rod 12 causes a stroke movement of the diaphragm 14 in the pump head 4 in the direction of the stroke axis X.
- the diaphragm 14 delimits one side of the metering chamber 16 and forms a displacement body in it, by means of which the volume of the metering chamber 16 can be changed for pumping or metering.
- the metering chamber 16 is connected to a suction port 18 and a pressure port 20.
- two non-return valves 22 are arranged in series in the suction channel.
- two check valves 24 are arranged in the flow path from the metering chamber 16 to the pressure connection 20 in the pressure channel. Two check valves 22 and 24 are provided here. It should be understood, however, that only one check valve 22 and one check valve 24 could be used.
- control electronics 26 which is connected to an operating and display device 28, by means of which parameters, such as the flow rate, can be set and information which the control electronics 26 outputs can be read.
- a certain delivery flow which is set, for example, via the operating and display device 28, is converted by the control electronics 26 into a corresponding control or regulation of the drive motor 6, so that it is operated at a corresponding speed, so that the membrane 14 with a corresponding lifting speed is moved in the direction of the lifting axis X.
- the stroke length can also be controlled by the control electronics 26 via the angle of rotation of the drive motor 6, which is preferably designed as a stepper motor.
- control electronics 26 are designed or programmed such that they use a special drive characteristic in the case of flow rates which are below a certain limit value stored in the control electronics 26 in order to cause the valves 22, 24 to close.
- the corresponding limit value can depend on the characteristic, size and special design of the pump head 4 and in particular the check valves 22 and 24. Even if it is it is preferred that this special drive characteristic, described below, can be used for low flow rates below a certain limit value, it should be understood that this drive characteristic could also be used for other flow rates.
- FIG. 2 shows a diagram in which the engine speed n of the drive motor 6 is shown over the stroke length H of the pressure stroke.
- the point 30 in the diagram indicates the start of a pressure stroke, while the point 32 in the diagram indicates the end of the pressure stroke at which the full stroke length H of the membrane 14 in the direction of the stroke axis X is reached.
- the pressure stroke is started with an increased speed n 1 of the drive motor 6.
- the control electronics 26 controls the drive motor 6 accordingly, so that it runs at this speed. Due to the gear 8 and the eccentric 10, this causes a corresponding, proportional first increased stroke speed of the membrane 14 in the pressure stroke.
- the increased stroke speed due to the increased speed n 1 causes an impulse or rapid pressure increase on the fluid in the metering chamber 16 at the beginning of the stroke, ie an increased pressure, which causes a tight, reliable closing of the suction-side check valve 22.
- the increased speed n 1 is maintained for a predetermined time, which corresponds to a corresponding stroke length up to point 34 of the pressure stroke.
- the pressure stroke is then continued at a reduced speed n 2 of the drive motor 6.
- This reduced speed n 2 thus corresponds to a reduced stroke speed of the diaphragm 14 caused by the gear 8 and the eccentric 10.
- This reduced speed n 2 or reduced stroke speed is maintained until the end of the pressure stroke 32.
- This reduced speed n 2 which is proportional to a reduced stroke speed of the diaphragm 14, is also predetermined by the control electronics 26 by appropriate control of the drive motor 6.
- the control electronics 26 selects the speeds n 1 and n 2 as a function of a predetermined target speed n s .
- This target speed n s is proportional to a target lifting speed, which in turn is proportional to a target flow, which is specified, for example, by input on the operating and display device 28.
- the proportional target speeds at which the drive motor 6 has to be driven can be stored in a memory for corresponding target delivery flows or can be currently calculated by the control electronics 26.
- the correspondingly increased rotational speed n 1 which is proportional to an increased first stroke speed
- the correspondingly reduced drive speed n 2 which is proportional to a second, lower stroke speed of the diaphragm 14
- these speeds n 1 and n 2 can also be currently calculated on the basis of algorithms stored in the control electronics 26.
- the first increased stroke speed and a second, lower stroke speed of the diaphragm 14 are set by the control electronics 26 so that the desired desired flow rate, which corresponds to the desired speed n s of the motor 6, is achieved on average over the entire stroke length 32.
- the quantity remains constant compared to a metering with a constant lifting speed proportional to the target speed n s .
- the stroke length 34 which takes place with the increased stroke speed, ie with the increased speed n 1, is preferably chosen to be short or short in comparison with the length of the overall stroke 32, so that an increased delivery flow occurs only very briefly at the start of the stroke, which, however, is negligible in terms of the total delivery flow over the total stroke length and nevertheless leads to increased metering accuracy due to the improved closing quality of the check valves 22 and 24.
- the point 34 preferably corresponds to between 2 and 20% of the total pressure stroke 32.
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Description
Die Erfindung betrifft ein Dosierpumpenaggregat gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a metering pump unit according to the preamble of claim 1.
Bekannte Dosierpumpenaggregate weisen einen Dosierraum auf, welcher an einer Seite durch einen Verdrängerkörper, beispielsweise in Form einer Membran, begrenzt ist. Der Verdrängerkörper kann das Volumen des Dosierraumes verändern, wodurch eine Pumpwirkung erreicht wird. Zum Antrieb des Verdrängerkörpers ist ein geeigneter Linearantrieb vorgesehen. Beispielsweise ist dies ein drehend antreibender Antriebsmotor in Form eines Schrittmotors, welcher über einen Exzenter ein Pleuel in linear oszillierende Bewegung versetzt. Ein- und ausgangsseitig des Dosierraumes sind Rückschlagventile angeordnet, welche im Saughub verhindern, dass das zu fördernde Medium aus der Druckleitung zurück in den Dosierraum fließt und im Druckhub verhindern, dass das Medium anstatt in die Druckleitung in die Saugleitung gedrückt wird.Known metering pump units have a metering space which is delimited on one side by a displacement body, for example in the form of a membrane. The displacer body can change the volume of the dosing chamber, whereby a pumping effect is achieved. A suitable linear drive is provided for driving the displacement body. For example, this is a rotationally driving drive motor in the form of a stepper motor, which sets a connecting rod in linearly oscillating motion via an eccentric. Check valves are arranged on the inlet and outlet sides of the metering chamber, which prevent the medium to be pumped from flowing back into the metering chamber in the suction stroke and prevent the medium from being pressed into the suction line instead of the pressure line.
Bei der Dosierung sehr geringer Volumina bzw. Förderströme, beispielsweise von wenigen Millilitern pro Stunde, sind sehr langsame Hubgeschwindigkeiten erforderlich, beispielsweise kann ein Druckhub mehrere Minuten, auch mehr als eine Viertelstunde benötigen. Bei diesen sehr langsamen Hub- und Fördergeschwindigkeiten lässt sich aufgrund der fehlenden Dynamik ein schnelles Schließen der Ventile nicht sicherstellen, was zu Leckverlusten und somit zu einer schlechten Dosiergenauigkeit führt.When metering very small volumes or flow rates, for example of a few milliliters per hour, very slow stroke speeds are required, for example a pressure stroke can take several minutes, even more than a quarter of an hour. At these very slow lifting and conveying speeds, a quick closing of the valves cannot be ensured due to the lack of dynamics, which leads to leakage losses and thus to poor metering accuracy.
Im Hinblick auf diese Problematik ist es auch Aufgabe der Erfindung, ein Dosierpumpenaggregat bereitzustellen, welches auch bei sehr geringen zu dosierenden Volumina eine hohe Dosiergenauigkeit gewährleistet.In view of these problems, it is also an object of the invention to provide a metering pump unit which ensures high metering accuracy even with very small volumes to be metered.
Diese Aufgabe wird durch ein Dosierpumpenaggregat mit den im Anspruch 1 angegebenen Merkmalen gelöst. Bevorzugte Ausführungsformen ergeben sich aus den zugehörigen Unteransprüchen, der nachfolgenden Beschreibung sowie den beigefugten Figuren.This object is achieved by a metering pump unit with the features specified in claim 1. Preferred embodiments result from the associated subclaims, the following description and the attached figures.
Das erfindungsgemäße Dosierpumpenaggregat weist in bekannter Weise einen Dosierraum auf, an welchem angrenzend ein Verdrängerkörper angeordnet ist. Der Verdrängerkörper bildet somit eine Wandung des Dosierraumes und kann durch seine Bewegung das Volumen des Dosierraumes ändern. Bei einem Saughub vergrößert sich das Volumen des Dosierraumes und bei einem Druckhub wird der Verdrängerkörper so bewegt, dass sich das Volumen des Dosierraumes verkleinert. Zur Bewegung des Verdrängerkörpers ist ein Verdrängerantrieb vorgesehen, welcher über eine Steuereinrichtung ansteuerbar bzw. regelbar ist. Über die Steuereinrichtung können dem Verdrängerantrieb insbesondere Geschwindigkeit, Betriebsdauer und Bewegungsrichtung vorgegeben werden, um das zu dosierende Volumen über die Ansteuerung des Verdrängerantriebs einzustellen bzw. zu regeln.The metering pump unit according to the invention has, in a known manner, a metering space, on which a displacement body is arranged adjacent. The displacement body thus forms a wall of the metering chamber and can change the volume of the metering chamber by its movement. During a suction stroke, the volume of the dosing chamber increases and during a pressure stroke, the displacer is moved so that the volume of the dosing chamber decreases. A displacer drive is provided for moving the displacer body and can be controlled or regulated via a control device. The control device can be used in particular to specify the speed, operating time and direction of movement of the displacement drive in order to set or regulate the volume to be metered by actuating the displacement drive.
Bevorzugt ist der Verdrängerantrieb ein elektrischer Antriebsmotor, insbesondere ein Schrittmotor, welcher sich sehr genau ansteuern lässt, um Hublänge und/oder Hubgeschwindigkeit des Verdrängerkörpers gezielt einzustellen, um die zu dosierende Menge und die Dosiergeschwindigkeit gemäß vorgegebener Werte einzuhalten.The displacer drive is preferably an electric drive motor, in particular a stepper motor, which can be controlled very precisely in order to selectively adjust the stroke length and / or stroke speed of the displacer body in order to maintain the quantity to be metered and the metering speed in accordance with predetermined values.
Bei dem Antriebsmotor kann es sich um einen Linearmotor oder um einen drehend antreibenden Elektromotor handeln, wobei die Drehbewegung dann über geeignete Getriebemittel, beispielsweise einen Kurbelantrieb, einen Nockenantrieb, einen Exzenter oder eine Spindel in eine Linearbewegung des Verdrängerkörpers umgesetzt wird. Als Antriebsmotor kann außer einem Schrittmotor beispielsweise auch ein EC-Motor, ein Servomotor oder ein anderer geeigneter elektrischer Antriebsmotor Verwendung finden.The drive motor can be a linear motor or a rotating electric motor, the rotary movement then being converted into a linear movement of the displacement body by means of suitable gear means, for example a crank drive, a cam drive, an eccentric or a spindle. In addition to a stepper motor, an EC motor, a servo motor or another suitable electrical drive motor can also be used as the drive motor.
Erfindungsgemäß sind die Steuereinrichtung und der Verdrängerantrieb derart ausgebildet, dass auch während eines Druckhubes die Verfahrgeschwindigkeit des Verdrängerkörpers verändert werden kann. Dies erfolgt durch Veränderung der Geschwindigkeit des Verdrängerantriebs, z. B. der Drehzahl bzw. Drehgeschwindigkeit des Antriebsmotors. Dabei ist die Steuereinrichtung ferner so ausgebildet, dass sie für bestimmte von der Dosierpumpe zu erzeugende Soll-Förderströme eine spezielle Fahr- bzw. Antriebscharakteristik des Verdrängerantriebs wählt und den Verdrängerantrieb entsprechend ansteuert. Erfindungsgemäß ist eine solche spezielle Antriebscharakteristik derart ausgestaltet, dass der Druckhub des Verdrängerkörpers mit einer ersten erhöhten Hubgeschwindigkeit begonnen wird und anschließend mit einer zweiten geringeren Hubgeschwindigkeit fortgesetzt wird. Dadurch, dass der Druckhub mit einer erhöhten Hubgeschwindigkeit begonnen wird, wird auf das zu fördernde Medium bzw. zu fördernde Fluid zu Beginn des Druckhubes ein stärkerer Impuls bzw. schneller Druckanstieg ausgeübt, welcher ein schnelles Schließen des Rückschlagventils veranlasst. Anschließend wird dann die Hubgeschwindigkeit durch entsprechende Ansteuerung des Verdrängerantriebs herabgesetzt und der Rest des Druckhubes wird mit geringerer Hub- bzw. Verfahrgeschwindigkeit des Verdrängerkörpers zu Ende geführt. So wird erreicht, dass trotz der erhöhten Hubgeschwindigkeit am Anfang des Druckhubes in dem Gesamthub nur ein geringes Volumen pro Zeiteinheit gefördert wird. Diese spezielle Antriebscharakteristik eignet sich somit insbesondere für die Förderung sehr geringer Volumenströme, bei welchen das oben genannte Problem des nicht zuverlässigen sofortigen Schließens der Rückschlagventile besteht.According to the invention, the control device and the displacement drive are designed such that the travel speed of the displacement body can be changed even during a pressure stroke. This is done by changing the speed of the displacement drive, e.g. B. the speed or speed of rotation of the drive motor. The control device is also designed such that it selects a special driving or driving characteristic of the displacement drive for certain desired flow rates to be generated by the metering pump and controls the displacement drive accordingly. According to the invention, such a special drive characteristic is designed in such a way that the pressure stroke of the displacement body is started with a first increased stroke speed and then continued with a second, lower stroke speed. Because the pressure stroke is started at an increased stroke speed, a stronger impulse or rapid pressure increase is exerted on the medium to be conveyed or fluid to be conveyed at the beginning of the pressure stroke, which causes the check valve to close quickly prompted. Then the stroke speed is then reduced by appropriate control of the displacer drive and the rest of the pressure stroke is completed with a lower stroke or travel speed of the displacer body. In this way it is achieved that, despite the increased stroke speed at the beginning of the pressure stroke, only a small volume is conveyed per unit of time in the total stroke. This special drive characteristic is therefore particularly suitable for the delivery of very low volume flows, in which the above-mentioned problem of the non-reliable immediate closing of the check valves exists.
Die Steuereinrichtung ist derart ausgebildet, dass sie zumindest für bestimmte von der Dosierpumpe zu erzeugende Förderströme den Verdrängerantrieb, z. B. einen Antriebsmotor derart ansteuert, dass ein Druckhub des Verdrängerkörpers mit einer ersten erhöhten Hubgeschwindigkeit begonnen und anschließend mit der zweiten geringeren Hubgeschwindigkeit fortgesetzt wird. Dadurch wird erreicht, dass bei einem Druckhub für insbesondere geringe Förderströme das Rückschlagventil zum Saugkanal hin schnell und zuverlässig geschlossen wird, so dass dort keine oder nur geringe Leckverluste auftreten und somit auch bei geringen Förderströmen eine hohe Dosiergenauigkeit erreicht wird. Nach dem Anfangsimpuls aufgrund der erhöhten Hubgeschwindigkeit wird dann von der Steuereinrichtung die Hubgeschwindigkeit durch Reduzierung der Geschwindigkeit des Verdrängerantriebs, d. h. z. B. der Drehzahl des Antriebsmotors reduziert, so dass insgesamt bei dem Druckhub nur ein geringerer Fördervolumenstrom erreicht wird.The control device is designed such that it, at least for certain flow rates to be generated by the metering pump, the displacement drive, for. B. controls a drive motor such that a pressure stroke of the displacer begins at a first increased stroke speed and then continues at the second lower stroke speed. It is thereby achieved that the check valve to the suction channel is closed quickly and reliably in the case of a pressure stroke for, in particular, low flow rates, so that there are no or only slight leakage losses and thus a high metering accuracy is achieved even with low flow rates. After the initial pulse due to the increased stroke speed, the control device then determines the stroke speed by reducing the speed of the displacement drive, i.e. H. e.g. B. the speed of the drive motor is reduced, so that overall only a lower flow rate is achieved in the pressure stroke.
Auch wenn gemäß einer bevorzugten Ausführungsform die Steuereinrichtung derart ausgebildet ist, dass sie die vorangehend und nachfolgend beschriebene spezielle Antriebscharakteristik im Druckhub ausführt, so ist doch zu verstehen, dass die Steuereinrichtung auch so ausgebildet sein kann, dass sie zusätzlich die vorangehend oder nachfolgend beschriebene spezielle Antriebsstrategie im Saughub ausführt. Bevorzugt ist die Steuereinrichtung somit derart ausgebildet, dass sie für Förderströme unterhalb eines vorbestimmten Grenzwertes den Verdrängerantrieb derart ansteuert, dass ein Druckhub des Verdrängerkörpers mit einer ersten erhöhten Hubgeschwindigkeit begonnen und anschließend mit einer zweiten geringeren Hubgeschwindigkeit fortgesetzt wird. Der genaue Grenzwert kann von der konstruktiven Ausgestaltung des Dosierraumes und insbesondere der verwendeten Rückschlagventile abhängen. Bei derart geringen Fördervolumenströmen, bei welchen ansonsten ein zuverlässiges Schließen der Ventile nicht mehr erreicht wird, soll die beschriebene spezielle Fahrcharakteristik des Verdrängerkörpers zum Einsatz kommen, gemäß derer mit einer erhöhten Hubgeschwindigkeit begonnen und der Druckhub anschließend mit einer gegenüber dieser erhöhten Hubgeschwindigkeit verringerten Hubgeschwindigkeit fortgesetzt wird. Die entsprechend spezifischen Grenzwerte werden der Steuereinrichtung vorgegeben bzw. sind in einem Speicher der Steuereinrichtung hinterlegt.Even if, according to a preferred embodiment, the control device is designed in such a way that it executes the special drive characteristic described above and below in the pressure stroke, it should nevertheless be understood that the control device can also be designed such that it additionally has the special drive strategy described above or below in the suction stroke. The control device is thus preferably designed such that it controls the displacement drive for flow rates below a predetermined limit value in such a way that a pressure stroke of the displacement body begins with a first increased stroke speed and then continues with a second lower stroke speed. The exact limit value can depend on the design of the dosing chamber and in particular on the check valves used. With such low delivery volume flows, at which otherwise a reliable closing of the valves is no longer achieved, the described special driving characteristics of the displacement body are to be used, according to which the lifting stroke begins and the pressure stroke is then continued with a stroke speed that is reduced compared to this increased stroke speed . The corresponding specific limit values are specified for the control device or are stored in a memory of the control device.
Die Änderung der Hubgeschwindigkeit des Verdrängerantriebs erfolgt, wie beschrieben, durch entsprechende Ansteuerung mittels der Steuereinrichtung, so dass der Verdrängerantrieb nach Vorgabe der Steuereinrichtung mit unterschiedlichen Geschwindigkeiten bzw. Drehzahlen betreibbar ist. Im Falle der Verwendung eines Schrittmotors kann der Motor eine vorgegebene Anzahl von Einzelschritten in einem bestimmten Zeitintervall ausführen. Die Anzahl der Einzelschritte pro Zeitintervall kann von der Steuereinrichtung veränderbar vorgegeben werden, um die Drehzahl des Antriebsmotors zu ändern.As described, the stroke speed of the displacement drive is changed by appropriate control by means of the control device, so that the displacement drive can be operated at different speeds or speeds according to the control device. If a stepper motor is used, the motor can carry out a predetermined number of individual steps in a specific time interval. The number of individual steps per time interval can be predetermined by the control device in order to change the speed of the drive motor.
Erfindungsgemäß ist die Steuereinrichtung derart ausgebildet, dass die erste erhöhte Hubgeschwindigkeit schneller als für einen Soll-Förderstrom erforderlich eingestellt wird. Hierdurch wird erreicht, dass gegenüber dem anfänglichen schnellen Druckanstieg, welcher bei der sonst für den Soll-Förderstrom erforderlichen Hubgeschwindigkeit auftreten wurde, ein schneller anfänglicher Druckanstieg auf das zu fordernde Medium ausgeübt wird, welcher zu einem zuverlässigen Schließen der Ventile, insbesondere des Ventils im Saugkanal fuhrt. Um dies zu erreichen, muss zu Anfang des Druckhubes die Hubgeschwindigkeit für einen eigentlich höheren Förderstrom gewählt werden. Durch die spätere Verringerung der Hubgeschwindigkeit wird dies dann wieder ausgeglichen, um insgesamt über den Gesamthub einen geringeren Fördervolumenstrom zu erreichen, als zu Beginn des Druckhubes mit der höheren Hubgeschwindigkeit erreicht wird.According to the invention, the control device is designed in such a way that the first increased lifting speed is set faster than is required for a desired delivery flow. This ensures that, compared to the initial rapid pressure increase which would occur at the stroke speed otherwise required for the desired delivery flow, a rapid initial pressure increase is exerted on the medium to be pumped, which leads to a reliable closing of the valves, in particular the valve in the suction channel leads. To achieve this, the stroke speed for an actually higher flow rate must be selected at the beginning of the pressure stroke. This is then compensated for by the later reduction in the stroke speed in order to achieve a lower delivery volume flow overall over the total stroke than is achieved at the start of the pressure stroke with the higher stroke speed.
Dabei ist die Steuereinrichtung derart ausgebildet, dass die zweite geringere Hubgeschwindigkeit langsamer als für einen Soll-Förderstrom erforderlich eingestellt wird. Dadurch kann gemeinsam mit der zu Beginn des Druckhubes gewählten Hubgeschwindigkeit, welche höher als für den Soll-Förderstrom erforderlich ist, im Durchschnitt über den gesamten Druckhub der Soll-Förderstrom erreicht werden. Insbesondere ist die Steuereinrichtung derart ausgestaltet, dass sie die erste erhöhte Hubgeschwindigkeit und die zweite verringerte Hubgeschwindigkeit sowie die Dauer des Teilhubes mit der ersten Hubgeschwindigkeit abhängig von einem vorgegebenen Soll-Förderstrom so auswählt bzw. berechnet, dass über den gesamten Druckhub ein durchschnittlicher Förderstrom erreicht wird, welcher dem gewünschten Soll-Förderstrom entspricht. Die Dauer, mit welcher bei dem Druckhub mit erhöhter Hubgeschwindigkeit gefahren wird und die Absolutwerte für die höhere und die demgegenüber verringerte Hubgeschwindigkeit können in der Steuereinrichtung für bestimmte Soll-Fördervolumenstrome in einem Speicher hinterlegt sein oder aber aktuell für einen ausgewählten Soll-Fördervolumenstrom gemäß vorgegebener Algorithmen berechnet werden. Auch ist während des Druckhubes eine Überwachung des Volumenstromes durch geeignete Sensoren möglich, so dass die Hubgeschwindigkeit auch während des Druckhubes von der Steuereinrichtung auf einen bestimmten Sollwert eingeregelt werden konnte.The control device is designed in such a way that the second, lower stroke speed is set slower than is required for a desired delivery flow. As a result, together with the stroke speed selected at the start of the pressure stroke, which is higher than is required for the target flow rate, the target flow rate can be achieved on average over the entire pressure stroke. In particular, the control device is designed in such a way that it selects or calculates the first increased lifting speed and the second reduced lifting speed and the duration of the partial stroke with the first lifting speed as a function of a predetermined desired flow rate so that an average flow rate is achieved over the entire pressure stroke , which corresponds to the desired flow rate. The duration with which the pressure stroke is operated at an increased stroke speed and the absolute values for the higher and, in contrast, the reduced stroke speed can be stored in the control device for certain desired delivery volume flows or can currently be stored for a selected desired delivery volume flow according to predetermined algorithms be calculated. The volume flow can also be monitored by suitable sensors during the pressure stroke, so that the stroke speed could also be adjusted to a specific desired value by the control device during the pressure stroke.
Gemäß einer bevorzugten Ausführungsform werden 2 % oder mehr des gesamten Druckhubes mit der ersten erhöhten Hubgeschwindigkeit ausgeführt. Weiter bevorzugt werden weniger als 20 % des gesamten Druckhubes mit der ersten erhöhten Hubgeschwindigkeit ausgeführt. Bei dem Hub muss es sich nicht um den maximal möglichen Hub handeln, vielmehr kann es sich auch nur um einen verkürzten Hub handeln. Dies ist somit nur ein kleiner Teil des Gesamthubes, so dass die konstante Dosierung des zu dosierenden Mediums durch die erhöhte Hubgeschwindigkeit zu Anfang des Druckhubes nur geringfügig beeinträchtigt wird. Da es ohne diese erhöhte Hubgeschwindigkeit jedoch zu Anfang des Druckhubes aufgrund der schlechten Schließqualität der Ventile ansonsten bei geringem Fördervolumenstrom zu unerwünschten Leckagen und damit zu einer Verschlechterung der Dosiergenauigkeit kommen würde, wird durch die erhöhte Hubgeschwindigkeit zu Anfang des Druckhubes insgesamt eine höhere Dosiergenauigkeit erreicht.According to a preferred embodiment, 2% or more of the total pressure stroke becomes with the first increased lifting speed. More preferably, less than 20% of the total pressure stroke is carried out with the first increased stroke speed. The stroke does not have to be the maximum possible stroke, rather it can only be a shortened stroke. This is only a small part of the total stroke, so that the constant metering of the medium to be metered is only slightly impaired by the increased stroke speed at the beginning of the pressure stroke. However, since without this increased stroke speed at the beginning of the pressure stroke due to the poor closing quality of the valves, undesirable leakages and thus a deterioration in the dosing accuracy would otherwise occur at a low flow rate, the higher stroke speed at the beginning of the pressure stroke results in a higher dosing accuracy overall.
Die Änderung der Hubgeschwindigkeit von der ersten erhöhten Hubgeschwindigkeit auf die zweite geringere Hubgeschwindigkeit kann sprunghaft oder aber auch in Form einer Rampe erfolgen. Auch eine Änderung in mehreren Schritten bzw. Stufen oder über eine Rampe mit sich ändernder Steigung ist möglich. Die erste erhöhte Hubgeschwindigkeit ist weiter bevorzugt größer gleich sechs Hübe pro Minute, während die zweite kleinere Hubgeschwindigkeit vorzugsweise weniger als sechs Hübe pro Minute beträgt. Die erste erhöhte Hubgeschwindigkeit kann weiter bevorzugt im Wesentlichen der Hubgeschwindigkeit im Saughub entsprechen. Zweckmäßigerweise ist die erste erhöhte Hubgeschwindigkeit um ein Vielfaches größer als die zweite geringere Hubgeschwindigkeit, vorzugsweise beträgt die erste erhöhte Hubgeschwindigkeit das Dreifache, gemäß einer weiteren bevorzugten Ausführungsform das Fünffache oder das Siebenfache oder mehr der zweiten geringeren Hubgeschwindigkeit.The change in the lifting speed from the first increased lifting speed to the second lower lifting speed can be carried out in leaps and bounds or else in the form of a ramp. A change in several steps or stages or via a ramp with changing incline is also possible. The first increased stroke speed is more preferably greater than or equal to six strokes per minute, while the second lower stroke speed is preferably less than six strokes per minute. The first increased lifting speed can further preferably essentially correspond to the lifting speed in the suction stroke. The first increased lifting speed is expediently many times greater than the second lower lifting speed, preferably the first increased lifting speed is three times, according to a further preferred embodiment five times or seven times or more the second lower lifting speed.
Nachfolgend wird die Erfindung beispielhaft anhand der beigefügten Figuren beschrieben. In diesen zeigt:
- Fig. 1
- in einer Schnittansicht ein erfindungsgemäßes Dosierpumpenaggregat, und
- Fig. 2
- in einem Diagramm, in welchem die Motordrehzahl über die Hublänge aufgetragen ist, die erfindungsgemäße Antriebscharakteristik für geringe Förderströme.
- Fig. 1
- in a sectional view an inventive metering pump unit, and
- Fig. 2
- in a diagram in which the engine speed is plotted over the stroke length, the drive characteristic according to the invention for low flow rates.
Das erfindungsgemäße Dosierpumpenaggregat weist ein Antriebsgehäuse 2 mit einem daran stirnseitig angeordneten Pumpenkopf 4 auf. In dem Antriebsgehäuse 2 ist ein Verdrängerantrieb in Form eines elektrischen Antriebsmotors 6 angeordnet, der vorzugsweise als Schrittmotor ausgebildet ist. Der Antriebsmotor 6 treibt über ein Getriebe 8 einen Exzenter 10 an. Durch den Exzenter 10 wird die drehende Antriebsbewegung des Antriebsmotors 6 in eine lineare Bewegung eines Pleuels 12 umgewandet. Das Pleuel 12 bewirkt eine Hubbewegung der Membran 14 in dem Pumpenkopf 4 in Richtung der Hubachse X. Die Membran 14 begrenzt eine Seite des Dosierraumes 16 und bildet in diesem einen Verdrängerkörper, durch welchen das Volumen des Dosierraumes 16 zum Pumpen bzw. Dosieren veränderbar ist. Der Dosierraum 16 steht in Verbindung mit einem Sauganschluss 18 und einem Druckanschluss 20. In dem Strömungsweg für den Sauganschluss 18 in den Dosierraum 16 sind im Saugkanal in Reihe zwei Rückschlagventile 22 angeordnet. Entsprechend sind im Strömungsweg von dem Dosierraum 16 zu dem Druckanschluss 20 in dem Druckkanal in Reihe zwei Rückschlagventile 24 angeordnet. Hier sind jeweils zwei Rückschlagventile 22 und 24 vorgesehen. Es ist zu verstehen, dass jedoch auch nur ein Rückschlagventil 22 und ein Rückschlagventil 24 Verwendung finden könnten.The metering pump unit according to the invention has a
In dem Motorgehäuse 2 ist darüber hinaus eine Steuereinrichtung bzw. Steuerelektronik 26 angeordnet, welche mit einer Bedien- und Anzeigeeinrichtung 28 verbunden ist, über welche Parameter, wie beispielsweise der Förderstrom einstellbar und Informationen, welche die Steuerelektronik 26 ausgibt, ablesbar sind. Ein bestimmter Förderstrom, welcher beispielsweise über die Bedien- und Anzeigeeinrichtung 28 eingestellt wird, wird von der Steuerelektronik 26 in eine entsprechende Ansteuerung bzw. Regelung des Antriebsmotors 6 umgesetzt, so dass dieser mit einer entsprechenden Drehzahl betrieben wird, so dass die Membran 14 mit einer entsprechenden Hubgeschwindigkeit in Richtung der Hubachse X bewegt wird. Auch die Hublänge ist von der Steuerelektronik 26 über den Drehwinkel des Antriebsmotors 6, welcher bevorzugt als Schrittmotor ausgebildet ist, steuerbar.In the
Wenn sehr geringe Förderströme gewählt werden, stellt sich das Problem, dass zu Beginn des Druckhubes die Rückschlagventile 22 im Saugkanal möglicherweise nicht unmittelbar vollständig schließen, so dass es dort zu Leckverlusten kommen kann, welche die Dosiergenauigkeit beeinträchtigen. Um dies zu vermeiden, ist die Steuerelektronik 26 derart ausgebildet bzw. programmiert, dass sie bei Förderströmen, welche unter einem bestimmten in der Steuerelektronik 26 abgespeicherten Grenzwert liegen, eine spezielle Antriebscharakteristik verwendet, um ein Schließen der Ventile 22, 24 zu veranlassen. Der entsprechende Grenzwert kann abhängen von der Charakteristik, Größe und speziellen Ausgestaltung des Pumpenkopfes 4 und insbesondere der Rückschlagventile 22 und 24. Auch wenn es bevorzugt ist, dass diese spezielle, nachfolgend beschriebene Antriebscharakteristik für geringe Förderströme unterhalb eines bestimmten Grenzwertes Verwendung finden kann, ist zu verstehen, dass diese Antriebscharakteristik auch für andere Förderströme zum Einsatz kommen könnte.If very low flow rates are selected, the problem arises that the
Die genannte Antriebscharakteristik wird näher anhand von
Die Steuerelektronik 26 wählt die Drehzahlen n1 und n2 in Abhängigkeit von einer vorgegebenen Soll-Drehzahl ns. Diese Soll-Drehzahl ns ist proportional zu einer Soll-Hubgeschwindigkeit, welche wiederum proportional zu einem Soll-Förderstrom ist, welcher beispielsweise durch Eingabe an der Bedien- und Anzeigeeinrichtung 28 vorgegeben wird. In der Steuerelektronik 26 können in einem Speicher für entsprechende Soll-Förderströme die proportionalen Soll-Drehzahlen, mit welchen der Antriebsmotor 6 angetrieben werden muss, hinterlegt sein oder von der Steuerelektronik 26 aktuell berechnet werden. Für die spezielle hier gezeigte Antriebscharakteristik können darüber hinaus für bestimmte Soll-Förderströme die entsprechend zu wählende erhöhte Drehzahl n1, welche proportional zu einer erhöhten ersten Hubgeschwindigkeit ist, und die entsprechend verringerte Antriebsdrehzahl n2, welche proportional zu einer zweiten geringeren Hubgeschwindigkeit der Membran 14 ist, sowie die Dauer des Teilhubes mit der erhöhten Drehzahl n1 gespeichert sein. Alternativ können auch diese Drehzahlen n1 und n2 auf Grundlage von in der Steuerelektronik 26 hinterlegten Algorithmen aktuell berechnet werden.The
Die Hublänge 34 bzw. Dauer, in welcher die Membran 14 mit der ersten erhöhten Hubgeschwindigkeit bzw. der Antriebsmotor 6 mit der ersten erhöhten Drehzahl n1 betrieben wird, die Höhe der ersten Drehzahl n1 und die Höhe der zweiten Drehzahl n2, welche einer ersten erhöhten Hubgeschwindigkeit und einer zweiten geringeren Hubgeschwindigkeit der Membran 14 entsprechen, werden von der Steuerelektronik 26 so eingestellt, dass über die gesamte Hublänge 32 im Durchschnitt der gewünschte Soll-Förderstrom, welchem die Soll-Drehzahl ns des Motors 6 entspricht, erreicht wird. Somit wird sichergestellt, dass durch die erhöhte Anfangsdrehzahl n1 im Durchschnitt über den gesamten Druckhub 32 keine erhöhte Menge dosiert wird. Die Menge bleibt konstant gegenüber einer Dosierung mit einer konstanten Hubgeschwindigkeit proportional zu der Soll-Drehzahl ns. Auch wird die Hublänge 34, welche mit der erhöhten Hubgeschwindigkeit, d. h. mit der erhöhten Drehzahl n1 erfolgt, vorzugsweise im Vergleich mit der Länge des Gesamthubes 32 klein bzw. kurz gewählt, so dass nur sehr kurzzeitig zu Beginn des Hubes ein erhöhter Förderstrom auftritt, was jedoch auf den Gesamtförderstrom über die Gesamthublänge vernachlässigbar ist und aufgrund der verbesserten Schließqualität der Rückschlagventile 22 und 24 dennoch zu einer erhöhten Dosiergenauigkeit führt. Der Punkt 34 entspricht bevorzugt zwischen 2 und 20 % des gesamten Druckhubes 32.The
Im vorliegend gezeigten Beispiel werden im Verlaufe des Druckhubes nur zwei Drehzahlen n1 und n2 verwendet, wobei sich die Drehzahl im Punkt 34 sprunghaft ändert. Es wäre jedoch auch möglich, die Drehzahl in mehreren Schritten oder langsam abfallend zu andern. Auch bei Verwendung mehrerer verschiedener Drehzahlen über den gesamten Druckhub werden diese der Hohe nach sowie der Zeitdauer nach, in welcher diese Drehzahlen und damit die proportionalen Hubgeschwindigkeiten zum Einsatz kommen, so eingestellt, dass im Durchschnitt über den Gesamthub ein gewünschter Soll-Förderstrom erreicht wird.
Claims (6)
- A metering pump assembly with a metering chamber (16), with a positive displacement body (14) which is arranged adjacent to this and which is movable by way of a positive displacement drive (6), as well as a control device (26) for actuating the positive displacement drive (6),
characterised in that
the control device (26) is designed in a manner such that at least for certain desired delivery flows which are to be produced by the metering pump, it activates the positive displacement drive (6) in a manner such that a delivery stroke of the positive displacement body (14) is begun at a first increased stroke speed (n1) and is subsequently continued at a second lower stroke speed (n2),
wherein the first increased stroke speed (n1) is adjusted to quicker than is necessary for a desired delivery flow,
that the second lower stroke speed (n2) is adjusted to slower than is necessary for a desired delivery flow, and
that the first (n1) and the second (n2) stroke speed as well as the duration (34) of the part-stroke at the first stroke speed (n1) are adjusted by the control device (26) such that an average delivery flow which corresponds to a desired delivery flow is achieved over the complete delivery stroke (32). - A metering pump assembly according to claim 1, characterised in that the control device (26) is designed in a manner such that for delivery flows below a predefined limit value, it activates the positive displacement drive (6) in a manner such that a delivery stroke of the positive displacement body (14) is begun at a first increased stroke speed (n1) and is subsequently continued at a second lower stroke speed (n2).
- A metering pump assembly according to one of the preceding claims, characterised in that for changing the stroke speed, the positive displacement drive (6) can be operated at different rotation speeds (n) or different speeds by way of a suitable activation by the control device (26).
- A metering pump assembly according to one of the preceding claims, characterised in that the positive displacement drive (6) is a stepper motor.
- A metering pump assembly according to one of the preceding claims, characterised in that 2% or more of the complete stroke is carried out at the first increased stroke speed (n1).
- A metering pump assembly according to one of the preceding claims, characterised in that less that 20% of the complete delivery stroke is carried out at the first increased stroke speed (n1).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP10001643.5A EP2362100B2 (en) | 2010-02-18 | 2010-02-18 | Metering pump aggregate and method for controlling same |
CN201180009714.3A CN102762860B (en) | 2010-02-18 | 2011-02-16 | The method of metering pump unit and control metering pump unit |
JP2012553215A JP5902101B2 (en) | 2010-02-18 | 2011-02-16 | Metering pump device and method for controlling metering pump device |
US13/579,719 US10054117B2 (en) | 2010-02-18 | 2011-02-16 | Dosing pump unit and method for controlling a dosing pump unit |
PCT/EP2011/000722 WO2011101119A1 (en) | 2010-02-18 | 2011-02-16 | Dosing pump unit and method for controlling a dosing pump unit |
Applications Claiming Priority (1)
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EP10001643.5A EP2362100B2 (en) | 2010-02-18 | 2010-02-18 | Metering pump aggregate and method for controlling same |
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EP2362100A1 EP2362100A1 (en) | 2011-08-31 |
EP2362100B1 EP2362100B1 (en) | 2013-10-09 |
EP2362100B2 true EP2362100B2 (en) | 2020-07-08 |
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US (1) | US10054117B2 (en) |
EP (1) | EP2362100B2 (en) |
JP (1) | JP5902101B2 (en) |
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US11480163B2 (en) | 2018-08-27 | 2022-10-25 | Saudi Arabian Oil Company | Pumping system with control features for controlling stroke duration and injection volume |
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DE10162773A1 (en) * | 2001-12-20 | 2003-07-10 | Knf Flodos Ag Sursee | metering |
DE202005013090U1 (en) | 2005-08-19 | 2007-01-04 | Prominent Dosiertechnik Gmbh | Motor e.g. asynchronous motor, dosing pump for dosing e.g. oil, has position sensor providing motion sequence of displacement organ so that electronic controlling of pump responds to operating conditions of dosing circle and dosing pump |
DE102005039772A1 (en) * | 2005-08-22 | 2007-03-08 | Prominent Dosiertechnik Gmbh | solenoid |
-
2010
- 2010-02-18 EP EP10001643.5A patent/EP2362100B2/en active Active
-
2011
- 2011-02-16 US US13/579,719 patent/US10054117B2/en active Active
- 2011-02-16 JP JP2012553215A patent/JP5902101B2/en active Active
- 2011-02-16 WO PCT/EP2011/000722 patent/WO2011101119A1/en active Application Filing
- 2011-02-16 CN CN201180009714.3A patent/CN102762860B/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2011101119A1 (en) | 2011-08-25 |
US10054117B2 (en) | 2018-08-21 |
US20130202454A1 (en) | 2013-08-08 |
JP2013519830A (en) | 2013-05-30 |
EP2362100B1 (en) | 2013-10-09 |
CN102762860A (en) | 2012-10-31 |
JP5902101B2 (en) | 2016-04-13 |
CN102762860B (en) | 2015-12-16 |
EP2362100A1 (en) | 2011-08-31 |
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