EP3768974B1 - Pump with detection of absolute angle of rotation - Google Patents

Pump with detection of absolute angle of rotation Download PDF

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Publication number
EP3768974B1
EP3768974B1 EP19735541.5A EP19735541A EP3768974B1 EP 3768974 B1 EP3768974 B1 EP 3768974B1 EP 19735541 A EP19735541 A EP 19735541A EP 3768974 B1 EP3768974 B1 EP 3768974B1
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EP
European Patent Office
Prior art keywords
pump
rotor
rotation
rotor shaft
angle
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.)
Active
Application number
EP19735541.5A
Other languages
German (de)
French (fr)
Other versions
EP3768974A1 (en
Inventor
Wolfgang Laufer
Jens Löffler
Mario STAIGER
Daniel Hauer
Markus Braxmaier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebm Papst St Georgen GmbH and Co KG
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Ebm Papst St Georgen GmbH and Co KG
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Publication of EP3768974A1 publication Critical patent/EP3768974A1/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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/06—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for stopping, starting, idling or no-load operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/08—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/24—Application for metering throughflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/05—Speed
    • F04C2270/052—Speed angular
    • F04C2270/0525—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/20—Flow

Definitions

  • the invention relates to a pump, in particular an orbital pump, for pumping a fluid.
  • the pump has a rotor sensor for detecting an absolute angle of rotation of a rotor shaft of the pump and a predetermined angle of rotation position.
  • a rotational angle position of a rotor is detected via three digital Hall sensors, which, however, do not detect an absolute rotor position allow and also allow the angle of rotation of the rotor to be recorded with a resolution of just 20°.
  • the position of the rotor is indirectly determined by the Hall sensors via the position of the magnetic field that excites the rotor.
  • a problem that occurs specifically with previously known orbital pumps is that when the orbital pump is switched off, an eccentric used is stopped in a non-predeterminable position, ie with a non-predetermined angle of rotation.
  • the indeterminate position of the eccentric does not rule out the possibility that the pump has an internal leak, which can lead to a leak flow through which fluid flows through the pump in an undefined manner.
  • Expensive volume flow sensors would always have to be provided for this purpose.
  • each known pump with a pump control, through which the rotor shaft is rotatable in a predetermined rotational angle position.
  • the invention is therefore based on the object of overcoming the aforementioned disadvantages and providing a pump and a method associated with the pump, with which leakage through the pump is prevented and exact positioning of the rotor in the pump is possible.
  • a pump in particular an orbital pump, is proposed for pumping a fluid.
  • the pump has at least one pump controller and one motor that can be controlled by the pump controller on.
  • the pump includes a rotor shaft for fluid delivery and a rotor sensor for detecting an absolute angle of rotation of the rotor shaft.
  • the rotor shaft can be in direct contact with the fluid to be pumped or can drive another component of the pump, which acts directly on the fluid without itself being in contact with the fluid.
  • the rotor sensor is connected to the at least one pump controller and is also designed to transmit the angle of rotation of the rotor shaft to the pump controller.
  • the pump controller is designed to control the motor, taking into account the detected angle of rotation, which drives or rotates the rotor shaft until the rotor shaft is in a predetermined angle of rotation position.
  • the control taking into account the angle of rotation, prevents the rotor shaft from overshooting and thereby increases the service life of the pump.
  • a cavity (delivery chamber) arranged in the pump can only be partially emptied, for example by rotating the rotor shaft by a predetermined angle. Since complete revolutions are not necessary to convey the fluid, small amounts of fluid can also be conveyed.
  • a pump according to the invention can also be calibrated for specific delivery quantities. Such a calibration can be used, for example, during production, but also with a pump installed in a system be performed. If predetermined amounts of fluid are to be delivered with the pump or if it is to be determined which amount is delivered per revolution or when the rotational angle of the rotor shaft changes, the volume delivered by the pump can be measured and linked to the rotational angle positions that occur, so that it is defined individually for each pump , which volume is conveyed at which angle of rotation change.
  • the determined values can be used to determine which new rotational angle position is to be approached with the rotor shaft, starting from a current rotational angle position.
  • the calibration can also be repeated, for example, at specified maintenance intervals, in order to be able to take possible mechanical wear into account and compensate for it using the controller.
  • a pump according to the invention and an associated controller can also be provided to close the rotor shaft when the pump is switched off or when the rotor shaft stops in a predetermined starting position or in one of several predetermined starting positions position. In a subsequent start-up process, a lower start-up current is therefore necessary, so that the pump is subject to less wear and has a low power consumption.
  • the pump has a pump housing, an elastically deformable pump ring and an eccentric.
  • the eccentric defines an off-center hole through which the rotor shaft extends, the eccentric being connected to the rotor shaft so that the rotor shaft drives the eccentric.
  • the rotor shaft forms the eccentric directly, so that the rotor shaft is the eccentric is.
  • the pump housing has a cylindrical recess or cavity from which a fluid inlet and a fluid outlet extend out of or into the pump housing.
  • the pump ring is arranged in the cavity or in the pump housing and is at a distance from the pump housing at least in sections in its radial direction.
  • the pump ring has a central opening which extends in the axial direction of the pump ring and is preferably arranged centered in its radial direction in the pump ring and in which the eccentric is arranged. Due to the eccentric in relation to the central opening, the pump ring is elastically deformed by the eccentric.
  • the eccentric has a section which protrudes further than the surrounding areas of the eccentric in relation to its axis of rotation, about which it is rotated. The eccentric therefore deforms in particular a rotatable section of the pump ring, which can be deformed in the radial direction by rotating the eccentric in the circumferential direction of the pump ring and can be pressed against the pump housing.
  • the pump ring itself is not rotated.
  • the rotor sensor is arranged on the rotor shaft, on the eccentric or on the pump ring and detects the absolute angle of rotation as the respective angle of rotation of the rotor shaft, the eccentric or the pump ring. Since the pump ring itself does not rotate, the position of the rotating section of the pump ring is detected.
  • the motor is an electric motor with a stator and a rotor.
  • the rotor is directly connected to the rotor shaft or merges directly into it.
  • the angle of rotation of the rotor shaft corresponds to an angle of rotation of the rotor, as a result of which the angle of rotation of the rotor shaft can be determined from the angle of rotation of the rotor.
  • the motor is an electric motor with a rotor, but the rotor is not directly but indirectly connected to the rotor shaft, for example via a gear.
  • the angle of rotation of the rotor shaft can be determined from an angle of rotation of the rotor, with the angle of rotation being able to be determined as a function of the connection of the rotor to the rotor shaft, for example the transmission ratio of the transmission.
  • the rotor sensor is arranged on the rotor of the motor.
  • the rotor sensor determines the angle of rotation of the rotor and consequently the angle of rotation of the rotor shaft.
  • the rotor sensor is an encoder or a resolver that detects the angle of rotation of the rotor shaft.
  • the encoder or resolver can output the angle of rotation as a digital signal or as an analog signal. In particular, the output as a sine and cosine signal is possible.
  • the rotor sensor is preferably an absolute encoder, which means that no referencing of the rotor shaft is necessary.
  • an alternative embodiment provides that the rotor sensor is an incremental encoder and the pump has a reference sensor for referencing the rotor sensor the position of the rotor shaft is detected in the predetermined rotational angle position.
  • the pump ring has a first and a second deformation section.
  • the pump ring In the first deformation section, the pump ring is designed to be more elastically deformable than in its second deformation section.
  • the pump ring In the first deformation section, the pump ring can be easily deformed in its radial direction by the eccentric, so that the eccentric requires less force to deform the pump ring in the first deformation section or a lesser torque can be applied to the eccentric for rotation about the axis of rotation.
  • the predetermined rotational angle position is set in the first deformation section. At the start of the rotation of the eccentric from a standstill of the eccentric, a lower torque is therefore necessary on the eccentric in the first deformation section than when the rotation starts in the second deformation section.
  • a leakage flow channel is defined in the pump between a fluid inlet into the pump and a fluid outlet from the pump. According to the invention it is provided that the leakage flow channel is closed with the rotor shaft in the predetermined rotational angle position. A leakage flow between the fluid inlet and the fluid outlet is thus prevented.
  • the rotating section of the pump ring is pressed by the eccentric onto the fluid inlet or the fluid outlet, so that it is sealed in a fluid-tight manner from an end face of the pump ring.
  • the invention also includes a method for controlling a pump according to the invention.
  • a fluid volume flow conveyed by the pump from a fluid inlet to a fluid outlet of the pump is calculated from a plurality of angles of rotation of the rotor shaft detected by the rotor sensor in a predetermined time interval. Then the die Motor driving the rotor shaft is controlled depending on a fluid volume flow to be conveyed according to a predetermined motor characteristic. The volume flow of fluid that is actually delivered is adjusted to the volume flow of fluid to be delivered by controlling the motor according to the motor characteristics.
  • a development of the method provides in particular that the motor is controlled to stop and position the rotor shaft at the predetermined rotational angle position when the volume flow to be delivered is zero. If the rotor shaft is to be stopped by the motor at the predetermined rotational angle position, the motor characteristic corresponds, for example, to slow braking of the motor, as a result of which the rotor shaft comes to a standstill at the predetermined position without overshooting.
  • the pump shown schematically is provided with a rotor sensor and a pump controller, even if these cannot be seen in the figure.
  • the pump housing 10 is shown in a section running orthogonally to a longitudinal axis, so that the cavity 14 located in the pump housing 10 with the components arranged therein can be seen.
  • the rotor shaft 40 shown in section runs through the center of the cylindrical cavity 14 or, in the sectional view, round cavity 14 along an axis of rotation, not shown, which extends along its axial direction orthogonally to the plane of the illustration.
  • An eccentric 30 is arranged on the rotor shaft 40 and acts or presses on the elastically deformable pump ring 20 via a bearing ring 32 between the pump ring 20 and the eccentric 30 .
  • the bearing ring 32 is a needle bearing formed, for example, from needle elements and designed as a radial bearing, through which the eccentric 30 can rotate in it without directly contacting the deformable pump ring 20, deforming the pump ring 20 in the pump ring 20.
  • the eccentric 30 presses the pump ring 20 in the eccentric direction 31, as a result of which the elastically deformable pump ring 20 is deformed in its radial direction lying in the plane of the illustration, so that the pump ring 20 with its section 21 in the radial direction on the pump housing 10 is present.
  • the deformed section 21 of the pump ring 20 migrates in the circumferential direction U around the axis of rotation, so that the section 21 rotates in the circumferential direction, with the pump ring 20 not rotating.
  • the pump ring 20 is spaced at a distance from the pump housing 10 in sections and rests against the pump housing 10 in the radial direction only in the rotating section 21 and in a sealing section 22 .
  • the rotation of the rotating section 21 of the pump ring 20 and the spacing of the pump ring 20 from the pump housing 10 in the radial direction define two chambers in the cavity 14 which change in size as a result of the rotation of the rotating section 21 .
  • a fluid is sucked into a first chamber connected to the fluid inlet 11 through the fluid inlet 11 into the cavity 14 or into the expanding first chamber, and a fluid is discharged from the second chamber connected to the fluid outlet 12 ejected from the cavity 14 or from the decreasing second chamber.
  • the pump ring 20 has two deformation sections 24, 25 adjacent to one another in the circumferential direction U or over an angular range in the circumferential direction U.
  • a deformation force is already applied to the pump ring 20 in the radial direction by the pin 13 extending parallel to the axis of rotation.
  • there is a cavity in the pump ring 20 which is located on the pin 13 and through which the pump ring 20 can be deformed more easily in the radial direction.
  • the pump ring 20 can also have further measures for easier deformability in relation to the adjoining second deformation section 25 .
  • the predetermined rotational angle position is therefore symmetrical to the pin 13 on the straight line bisecting the rotor shaft 40 and the pin 13 .
  • This predetermined rotational angle position can be defined as 0°, for example, with the illustrated eccentric being shown in a rotational angle position rotated by 90° along the rotation path 33 .
  • the angle of rotation of the rotor shaft 40 can be detected, for example, on the rotor shaft 40, on the eccentric 30, on the pump ring 20 by the rotating section 21 of the pump ring 20 or on a rotor of a motor that is not shown and drives the rotor shaft 40.
  • the eccentric 30 is connected in one piece to the rotor shaft 40, with the rotor shaft 40 also being able to form the eccentric 30 in one piece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Description

Die Erfindung betrifft eine Pumpe, insbesondere eine Orbitalpumpe, zum Pumpen eines Fluides. Die Pumpe weist hierzu einen Rotorsensor zur Erfassung eines absoluten Drehwinkels einer Rotorwelle der Pumpe sowie eine vorbestimmten Drehwinkelposition auf.The invention relates to a pump, in particular an orbital pump, for pumping a fluid. For this purpose, the pump has a rotor sensor for detecting an absolute angle of rotation of a rotor shaft of the pump and a predetermined angle of rotation position.

Aus dem Stand der Technik sind bereits verschiedene Ausführungsformen von Pumpen mit einer Drehwinkelerfassung bekannt. Beispielsweise wird eine Drehwinkelposition eines Rotors bei einer bekannten Lösung über drei digitale Hall-Sensoren erfasst, welche jedoch keine absolute Rotorlagenerkennung ermöglichen und eine Erfassung des Drehwinkels des Rotors auch lediglich mit einer Auflösung von 20° erlauben. Durch die Hall-Sensoren wird die Position des Rotors indirekt über die Position des Magnetfelds ermittelt, welches den Rotor anregt.Various embodiments of pumps with a rotation angle detection are already known from the prior art. For example, in a known solution, a rotational angle position of a rotor is detected via three digital Hall sensors, which, however, do not detect an absolute rotor position allow and also allow the angle of rotation of the rotor to be recorded with a resolution of just 20°. The position of the rotor is indirectly determined by the Hall sensors via the position of the magnetic field that excites the rotor.

Bei einer derartigen Erfassung des Drehwinkels werden viele im Stand der Technik verbreitete Pumpen im "Open-Loop"-Betrieb angesteuert, bei dem einem sich drehenden Magnetfeld des die Pumpe antreibendes Motors ein bestimmtes Muster aufgeprägt wird. Der Rotor folgt dann diesem erzeugten Magnetfeld mehr oder weniger genau. Aufgrund einer erhöhten Last am Rotor kann es dazu kommen, dass dieser dem Magnetfeld hinterher eilt und die Drehzahlen und Drehwinkel des Magnetfeldes und des Rotors nicht mehr übereinstimmen. Eine Berechnung des geförderten Volumenstroms und eine Positionierung des Rotors werden dadurch nicht mehr möglich, da der tatsächliche bzw. absolute Drehwinkel des Rotors unbekannt ist.When the angle of rotation is detected in this way, many pumps that are common in the prior art are driven in "open-loop" operation, in which a specific pattern is impressed on a rotating magnetic field of the motor driving the pump. The rotor then follows this generated magnetic field more or less precisely. Due to an increased load on the rotor, it can happen that it lags behind the magnetic field and the speeds and angles of rotation of the magnetic field and the rotor no longer match. A calculation of the delivered volume flow and a positioning of the rotor are no longer possible because the actual or absolute angle of rotation of the rotor is unknown.

Neben den Nachteilen des "Open-Loop"-Betriebs kommt es ferner zu weiteren Einschränkungen und Nachteilen an den Pumpen. Beispielsweise kommt es bei den im Stand der Technik in Pumpen verbreiteten Rotoren zu einem undefinierten Überschwingen des Rotors um eine angefahrene Position. Dadurch wird beispielsweise eine Membran oder ein anderes elastisches Element, das mit dem Rotor in Verbindung steht, stärker belastet als ohne das Überschwingen, womit ein erhöhter Verschleiß an dem elastischen Element auftritt. Durch das Überschwingen erhöht sich zudem eine Dosier- oder Fördervarianz, da durch die Bewegung des Rotors um die angefahrene Position beim Überschwingen weiter undefiniert ein Fluid durch die Pumpe gefördert wird.In addition to the disadvantages of "open-loop" operation, there are also further restrictions and disadvantages on the pumps. For example, in the case of the rotors that are widespread in pumps in the prior art, there is an undefined overshooting of the rotor around a position that has been moved to. As a result, for example, a diaphragm or another elastic element that is connected to the rotor is subjected to a greater load than without the overshoot, with the result that increased wear occurs on the elastic element. The overshoot also increases a metering or delivery variance, since the movement of the rotor around the position moved to during the overshoot causes a fluid to continue to be delivered through the pump in an undefined manner.

Hinzukommt, dass es nicht möglich ist, die absolute Position des Rotors zu ermitteln oder den Rotor auf eine bestimmte Position zu positionieren, insbesondere, da die Auflösung bei vielen bei Pumpen verbreiteten Rotorsensoren zu gering ist und allenfalls eine Position innerhalb eines durch die Auflösung vorbestimmten Bereichs angefahren werden kann.In addition, it is not possible to determine the absolute position of the rotor or to position the rotor to a specific position, especially since the resolution of many rotor sensors commonly used in pumps is too low and at most a position within a range predetermined by the resolution can be approached.

Ein speziell bei vorbekannten Orbitalpumpen auftretendes Problem ist, dass ein verwendeter Exzenter beim Abschalten der Orbitalpumpe auf einer nicht vorherbestimmbaren Position, also mit einem nicht vorbestimmten Drehwinkel gestoppt wird. Durch die unbestimmte Lage des Exzenters ist nicht ausgeschlossen, dass die Pumpe eine interne Leckage aufweist, durch welche es zu einer Leckage-Strömung kommen kann, durch die undefiniert Fluid durch die Pumpe strömt. Dadurch ist es über eine Drehzahl des Rotors nicht möglich zu ermitteln, wie viel Fluid von der Pumpe gefördert wurde bzw. wie viel Fluid ein an die Pumpe angeschlossener Verbraucher, zu dem das Fluid gepumpt wird, verbraucht. Es müssten hierfür immer teure Volumenstromsensoren vorgesehen werden.A problem that occurs specifically with previously known orbital pumps is that when the orbital pump is switched off, an eccentric used is stopped in a non-predeterminable position, ie with a non-predetermined angle of rotation. The indeterminate position of the eccentric does not rule out the possibility that the pump has an internal leak, which can lead to a leak flow through which fluid flows through the pump in an undefined manner. As a result, it is not possible to determine via a rotational speed of the rotor how much fluid was pumped by the pump or how much fluid a consumer connected to the pump and to which the fluid is pumped consumes. Expensive volume flow sensors would always have to be provided for this purpose.

Beispielsweise sind aus den Dokumenten DE 10 2014 109 558 A1 , DE 10 2015 203 437 B3 und JP H11 280 664 A jeweils Pumpen mit einer Pumpensteuerung bekannt, durch welche die Rotorwelle in eine vorbestimmte Drehwinkelposition rotierbar ist.For example, from the documents DE 10 2014 109 558 A1 , DE 10 2015 203 437 B3 and JP H11 280 664 A each known pump with a pump control, through which the rotor shaft is rotatable in a predetermined rotational angle position.

Der Erfindung liegt deshalb die Aufgabe zugrunde, die vorgenannten Nachteile zu überwinden und eine Pumpe sowie ein zu der Pumpe gehörendes Verfahren bereitzustellen, mit welcher eine Leckage durch die Pumpe verhindert wird und eine exakte Positionierung des Rotors in der Pumpe möglich ist.The invention is therefore based on the object of overcoming the aforementioned disadvantages and providing a pump and a method associated with the pump, with which leakage through the pump is prevented and exact positioning of the rotor in the pump is possible.

Diese Aufgabe wird durch die Merkmalskombination gemäß Patentanspruch 1 gelöst.This object is achieved by the combination of features according to claim 1.

Erfindungsgemäß wird eine Pumpe, insbesondere eine Orbitalpumpe, zum Pumpen eines Fluides vorgeschlagen. Die Pumpe weist wenigstens eine Pumpensteuerung und einen durch die Pumpensteuerung steuerbaren Motor auf. Ferner umfasst die Pumpe eine Rotorwelle zur Fluidförderung und einen Rotorsensor zur Erfassung eines absoluten Drehwinkels der Rotorwelle. Die Rotorwelle kann unmittelbar mit dem zu fördernden Fluid in Kontakt stehen oder ein weiteres Bauteil der Pumpe antreiben, welches unmittelbar auf das Fluid wirkt, ohne selbst mit dem Fluid in Kontakt zu sein. Der Rotorsensor ist mit der wenigstens einen Pumpensteuerung verbunden und ist ferner ausgebildet, den Drehwinkel der Rotorwelle an die Pumpensteuerung zu übermitteln. Die Pumpensteuerung ist ausgebildet, den Motor unter Berücksichtigung des erfassten Drehwinkels anzusteuern, welcher die Rotorwelle antreibt bzw. rotiert, bis die Rotorwelle in einer vorbestimmten Drehwinkelposition steht.According to the invention, a pump, in particular an orbital pump, is proposed for pumping a fluid. The pump has at least one pump controller and one motor that can be controlled by the pump controller on. Furthermore, the pump includes a rotor shaft for fluid delivery and a rotor sensor for detecting an absolute angle of rotation of the rotor shaft. The rotor shaft can be in direct contact with the fluid to be pumped or can drive another component of the pump, which acts directly on the fluid without itself being in contact with the fluid. The rotor sensor is connected to the at least one pump controller and is also designed to transmit the angle of rotation of the rotor shaft to the pump controller. The pump controller is designed to control the motor, taking into account the detected angle of rotation, which drives or rotates the rotor shaft until the rotor shaft is in a predetermined angle of rotation position.

Durch die Berücksichtigung des Drehwinkels zur Ansteuerung der Rotorwelle und dem gezielten und gesteuerten Positionieren der Rotorwelle in eine vorbestimmte Drehwinkelposition ist es möglich, die Dosiervarianz der Pumpe zu senken, so dass bei einem sich widerholenden Pumpvorgang eine immer gleiche Menge Fluid gefördert werden kann. Insbesondere wird durch die Steuerung unter Berücksichtigung des Drehwinkels das überschwingen der Rotorwelle verhindert und dadurch die Lebensdauer der Pumpe erhöht.By taking into account the angle of rotation for controlling the rotor shaft and the targeted and controlled positioning of the rotor shaft in a predetermined angle of rotation position, it is possible to reduce the metering variance of the pump, so that the same amount of fluid can always be pumped during a repetitive pumping process. In particular, the control, taking into account the angle of rotation, prevents the rotor shaft from overshooting and thereby increases the service life of the pump.

Hinzukommt, dass durch die exakte Positionierung der Rotorwelle ein in der Pumpe angeordneter Hohlraum (Förderkammer) nur teilweise entleert werden kann, indem die Rotorwelle beispielsweise um einen vorbestimmten Winkel gedreht wird. Da somit keine vollständigen Umdrehungen zur Förderung des Fluides notwendig sind, können auch kleine Fluidmengen gefördert werden.In addition, due to the exact positioning of the rotor shaft, a cavity (delivery chamber) arranged in the pump can only be partially emptied, for example by rotating the rotor shaft by a predetermined angle. Since complete revolutions are not necessary to convey the fluid, small amounts of fluid can also be conveyed.

Sind die Drehwinkel bzw. die genauer Drehwinkelposition der Rotorwelle bekannt kann eine erfindungsgemäße Pumpe zudem für bestimmte Fördermengen kalibriert werden. Eine solche Kalibrierung kann beispielsweise bei der Herstellung, jedoch auch bei einer in einer Anlage eingebauten Pumpe durchgeführt werden. Sollen vorbestimmte Fluidmengen mit der Pumpe gefördert werden oder bestimmt werden, welche Menge pro Umdrehung oder bei der Drehwinkeländerung der Rotorwelle gefördert wird, kann das von der Pumpe geförderte Volumen gemessen und mit den dabei auftretenden Drehwinkelpositionen verknüpft werden, so dass für jede Pumpe individuell festgelegt wird, welches Volumen bei welcher Drehwinkeländerung gefördert wird. Soll später eine bestimmte Fluidmenge (Volumen) gefördert werden, kann anhand der ermittelten Werte bestimmt werden, welche neue Drehwinkelposition mit der Rotorwelle ausgehend von einer aktuellen Drehwinkelposition angefahren werden soll. Die Kalibrierung kann beispielsweise auch bei vorgegebenen Wartungsintervallen wiederholt werden, um einen möglichen mechanischen Verschleiß berücksichtigen und durch die Steuerung kompensieren zu können.If the angle of rotation or the precise angular position of the rotor shaft is known, a pump according to the invention can also be calibrated for specific delivery quantities. Such a calibration can be used, for example, during production, but also with a pump installed in a system be performed. If predetermined amounts of fluid are to be delivered with the pump or if it is to be determined which amount is delivered per revolution or when the rotational angle of the rotor shaft changes, the volume delivered by the pump can be measured and linked to the rotational angle positions that occur, so that it is defined individually for each pump , which volume is conveyed at which angle of rotation change. If a specific amount of fluid (volume) is to be conveyed later, the determined values can be used to determine which new rotational angle position is to be approached with the rotor shaft, starting from a current rotational angle position. The calibration can also be repeated, for example, at specified maintenance intervals, in order to be able to take possible mechanical wear into account and compensate for it using the controller.

Zum Anlauf einer Pumpe mit stillstehender Rotorwelle sind abhängig von der Drehwinkelposition zudem unterschiedliche Anlaufströme nötig. Um einen Anlauf der Pumpe mit möglichst geringen Strömen zu ermöglichen, kann durch eine erfindungsgemäße Pumpe und eine zugehörige Steuerung zudem vorgesehen sein, die Rotorwelle bei einem Abschalten der Pumpe oder bei einem Anhalten der Rotorwelle in einer vorbestimmten Anlaufposition oder in einer von mehreren vorbestimmten Anlaufpositionen zu positionieren. Bei einem darauf folgenden Anlaufprozess ist somit ein geringerer Anlaufstrom notwendig, so dass die Pumpe einem geringen Verschleiß unterliegt und eine geringe Stromaufnahme aufweist.Different starting currents are also required to start a pump with a stationary rotor shaft, depending on the rotational angle position. In order to enable the pump to start up with the lowest possible currents, a pump according to the invention and an associated controller can also be provided to close the rotor shaft when the pump is switched off or when the rotor shaft stops in a predetermined starting position or in one of several predetermined starting positions position. In a subsequent start-up process, a lower start-up current is therefore necessary, so that the pump is subject to less wear and has a low power consumption.

Eine vorteilhafte Ausführungsform der Erfindung sieht vor, dass die Pumpe ein Pumpengehäuse, einen elastisch verformbaren Pumpenring und einen Exzenter aufweist. Der Exzenter bestimmt ein außermittiges Loch, durch welches sich die Rotorwelle erstreckt, wobei der Exzenter mit der Rotorwelle verbunden ist, so dass die Rotorwelle den Exzenter antreibt. Alternativ bildet die Rotorwelle den Exzenter unmittelbar aus, so dass die Rotorwelle der Exzenter ist. Das Pumpengehäuse weist eine zylinderförmige Ausnehmung bzw. Hohlraum auf, von welchem sich aus ein Fluideingang und ein Fluidausgang aus dem bzw. in das Pumpengehäuse erstrecken. In dem Hohlraum bzw. in dem Pumpengehäuse ist der Pumpenring angeordnet und zumindest abschnittsweise in seine Radialrichtung von dem Pumpengehäuse beabstandet. Der Pumpenring weist eine sich in Axialrichtung des Pumpenrings erstreckende und vorzugsweise in seine Radialrichtung zentriert in dem Pumpenring angeordnete Zentralöffnung auf, in welcher der Exzenter angeordnet ist. Durch den gegenüber der Zentralöffnung außermittigen Exzenter wird der Pumpenring durch den Exzenter elastisch verformt. Der Exzenter weist hierzu einen Abschnitt auf, welcher gegenüber seiner Rotationsachse, um welche er rotiert wird, weiter hervorsteht als die umliegenden Bereiche des Exzenters. Der Exzenter verformt daher insbesondere einen rotierbaren Abschnitt des Pumpenrings, der durch eine Rotation des Exzenters in Umfangsrichtung des Pumpenrings in Radialrichtung verformbar und an das Pumpengehäuse drückbar ist. Der Pumpenring wird selbst nicht rotiert. Es werden lediglich unterschiedliche Bereiche des Pumpenrings verformt und an das Pumpengehäuse gedrückt, wodurch der Abschnitt des Pumpenrings, der verformt ist, um die Rotationsachse bzw. in Umfangsrichtung des Pumpenrings wandert bzw. rotiert. Ein Drehwinkel des rotierbaren Abschnitts des Pumpenrings entspricht dem Drehwinkel der Rotorwelle, womit durch die als Drehwinkel angegebene Position der Rotorwelle der Position des rotierbaren Abschnitts entspricht.An advantageous embodiment of the invention provides that the pump has a pump housing, an elastically deformable pump ring and an eccentric. The eccentric defines an off-center hole through which the rotor shaft extends, the eccentric being connected to the rotor shaft so that the rotor shaft drives the eccentric. Alternatively, the rotor shaft forms the eccentric directly, so that the rotor shaft is the eccentric is. The pump housing has a cylindrical recess or cavity from which a fluid inlet and a fluid outlet extend out of or into the pump housing. The pump ring is arranged in the cavity or in the pump housing and is at a distance from the pump housing at least in sections in its radial direction. The pump ring has a central opening which extends in the axial direction of the pump ring and is preferably arranged centered in its radial direction in the pump ring and in which the eccentric is arranged. Due to the eccentric in relation to the central opening, the pump ring is elastically deformed by the eccentric. For this purpose, the eccentric has a section which protrudes further than the surrounding areas of the eccentric in relation to its axis of rotation, about which it is rotated. The eccentric therefore deforms in particular a rotatable section of the pump ring, which can be deformed in the radial direction by rotating the eccentric in the circumferential direction of the pump ring and can be pressed against the pump housing. The pump ring itself is not rotated. Only different areas of the pump ring are deformed and pressed against the pump housing, as a result of which the section of the pump ring that is deformed migrates or rotates about the axis of rotation or in the circumferential direction of the pump ring. An angle of rotation of the rotatable section of the pump ring corresponds to the angle of rotation of the rotor shaft, which means that the position of the rotor shaft specified as the angle of rotation corresponds to the position of the rotatable section.

Der Rotorsensor ist bei einer vorteilhaften Weiterbildung an der Rotorwelle, an dem Exzenter oder an dem Pumpenring angeordnet und erfasst den absoluten Drehwinkel als den jeweiligen Drehwinkel der Rotorwelle, des Exzenters oder des Pumpenrings. Da der Pumpenring selbst nicht rotiert, wird hierbei die Position des rotierenden Abschnitts des Pumpenrings erfasst.In an advantageous development, the rotor sensor is arranged on the rotor shaft, on the eccentric or on the pump ring and detects the absolute angle of rotation as the respective angle of rotation of the rotor shaft, the eccentric or the pump ring. Since the pump ring itself does not rotate, the position of the rotating section of the pump ring is detected.

Bei einer ebenfalls vorteilhaften Variante der Erfindung ist vorgesehen, dass der Motor ein Elektromotor mit einem Stator und einem Rotor ist. Der Rotor ist unmittelbar mit der Rotorwelle verbunden oder geht unmittelbar in diese über. Ferner entspricht der Drehwinkel der Rotorwelle einem Drehwinkel des Rotors, wodurch der Drehwinkel der Rotorwelle durch den Drehwinkel des Rotors ermittelbar ist.In a likewise advantageous variant of the invention, it is provided that the motor is an electric motor with a stator and a rotor. The rotor is directly connected to the rotor shaft or merges directly into it. Furthermore, the angle of rotation of the rotor shaft corresponds to an angle of rotation of the rotor, as a result of which the angle of rotation of the rotor shaft can be determined from the angle of rotation of the rotor.

Alternativ sieht eine Weiterbildung vor, dass der Motor ein Elektromotor mit einem Rotor ist, der Rotor jedoch nicht unmittelbar, sondern mittelbar, beispielsweise über ein Getriebe, mit der Rotorwelle verbunden ist. Der Drehwinkel der Rotorwelle ist aus einem Drehwinkel des Rotors bestimmbar, wobei der Drehwinkel abhängig von der Verbindung des Rotors mit der Rotorwelle, beispielsweise dem Übersetzungsverhältnis des Getriebes, bestimmbar ist.Alternatively, a development provides that the motor is an electric motor with a rotor, but the rotor is not directly but indirectly connected to the rotor shaft, for example via a gear. The angle of rotation of the rotor shaft can be determined from an angle of rotation of the rotor, with the angle of rotation being able to be determined as a function of the connection of the rotor to the rotor shaft, for example the transmission ratio of the transmission.

Der Rotorsensor ist bei einer möglichen Ausgestaltungsvariante der Erfindung an dem Rotor des Motors angeordnet. Der Rotorsensor ermittelt den Drehwinkel des Rotors und folglich den Drehwinkel der Rotorwelle.In one possible embodiment variant of the invention, the rotor sensor is arranged on the rotor of the motor. The rotor sensor determines the angle of rotation of the rotor and consequently the angle of rotation of the rotor shaft.

Eine vorteilhafte Weiterbildung sieht vor, dass der Rotorsensor ein Encoder oder ein Resolver ist, der den Drehwinkel der Rotorwelle erfasst. Der Encoder oder der Resolver können den Drehwinkel als ein digitales Signal oder als ein analoges Signal ausgeben. Möglich ist hierbei insbesondere die Ausgabe als Sinus- und Cosinus-Signal.An advantageous development provides that the rotor sensor is an encoder or a resolver that detects the angle of rotation of the rotor shaft. The encoder or resolver can output the angle of rotation as a digital signal or as an analog signal. In particular, the output as a sine and cosine signal is possible.

Vorzugsweise ist der Rotorsensor ein Absolutwertgeber, wodurch keine Referenzierung der Rotorwelle notwendig ist.The rotor sensor is preferably an absolute encoder, which means that no referencing of the rotor shaft is necessary.

Da die Rotorwelle jedoch vorzugweise an einer vorbestimmten Position gestoppt werden soll und bei einem Anfahren aus dieser Position der Drehwinkel der Rotorwelle bekannt ist, sieht eine alternative Ausführungsform vor, dass der Rotorsensor ein Inkrementalgeber ist und die Pumpe zur Referenzierung des Rotorsensors einen Referenzsensor aufweist, der die Position der Rotorwelle in der vorbestimmten Drehwinkelposition erfasst.However, since the rotor shaft should preferably be stopped at a predetermined position and the angle of rotation of the rotor shaft is known when starting from this position, an alternative embodiment provides that the rotor sensor is an incremental encoder and the pump has a reference sensor for referencing the rotor sensor the position of the rotor shaft is detected in the predetermined rotational angle position.

Der Pumpenring weist in Umfangsrichtung gesehen einen ersten und einen zweiten Verformungsabschnitt auf. In dem ersten Verformungsabschnitt ist der Pumpenring elastischer verformbar ausgebildet als in seinem zweiten Verformungsabschnitt. In dem ersten Verformungsabschnitt ist der Pumpenring dadurch in seine Radialrichtung einfach von dem Exzenter verformbar, so dass der Exzenter zum Verformen des Pumpenrings in dem ersten Verformungsabschnitt eine geringere Kraft benötigt bzw. an dem Exzenter zur Rotation um die Rotationsachse ein geringeres Drehmoment anliegen kann. Die vorbestimmte Drehwinkelposition ist in dem ersten Verformungsabschnitt festgelegt. Beim Beginn der Rotation des Exzenters aus einem Stillstand des Exzenters ist im ersten Verformungsabschnitt daher ein geringeres Drehmoment an dem Exzenter notwendig als bei einem Beginn der Rotation in dem zweiten Verformungsabschnitt.Viewed in the circumferential direction, the pump ring has a first and a second deformation section. In the first deformation section, the pump ring is designed to be more elastically deformable than in its second deformation section. In the first deformation section, the pump ring can be easily deformed in its radial direction by the eccentric, so that the eccentric requires less force to deform the pump ring in the first deformation section or a lesser torque can be applied to the eccentric for rotation about the axis of rotation. The predetermined rotational angle position is set in the first deformation section. At the start of the rotation of the eccentric from a standstill of the eccentric, a lower torque is therefore necessary on the eccentric in the first deformation section than when the rotation starts in the second deformation section.

Zwischen einem Fluideingang in die Pumpe und einem Fluidausgang aus der Pumpe ist ein Leckage-Strömungskanal in der Pumpe bestimmt. Erfindungsgemäß ist vorgesehen, dass der Leckage-Strömungskanal mit der Rotorwelle in der vorbestimmten Drehwinkelposition verschlossen ist. Eine Leckage-Strömung zwischen dem Fluideingang und dem Fluidausgang ist somit verhindert. Hierzu wird beispielsweise der rotierende Abschnitt des Pumpenrings von dem Exzenter auf den Fluideingang oder den Fluidausgang gedrückt, so dass dieser von einer Stirnseite des Pumpenrings fluiddicht abgedichtet ist.A leakage flow channel is defined in the pump between a fluid inlet into the pump and a fluid outlet from the pump. According to the invention it is provided that the leakage flow channel is closed with the rotor shaft in the predetermined rotational angle position. A leakage flow between the fluid inlet and the fluid outlet is thus prevented. For this purpose, for example, the rotating section of the pump ring is pressed by the eccentric onto the fluid inlet or the fluid outlet, so that it is sealed in a fluid-tight manner from an end face of the pump ring.

Zu der Erfindung gehört ferner ein Verfahren zur Ansteuerung einer erfindungsgemäßen Pumpe. Ein durch die Pumpe von einem Fluideingang zu einem Fluidausgang der Pumpe geförderter Fluid-Volumenstrom wird aus mehreren in einem vorbestimmten Zeitintervall durch den Rotorsensor erfassten Drehwinkeln der Rotorwelle berechnet. Anschließend wird der die Rotorwelle antreibende Motor abhängig von einem zu fördernden Fluid-Volumenstrom nach einer vorbestimmten Motorcharakteristik angesteuert. Der tatsächlich geförderte Fluid-Volumenstrom wird durch die Ansteuerung des Motors entsprechend der Motorcharakteristik dem zu fördernden Fluid-Volumenstrom angeglichen.The invention also includes a method for controlling a pump according to the invention. A fluid volume flow conveyed by the pump from a fluid inlet to a fluid outlet of the pump is calculated from a plurality of angles of rotation of the rotor shaft detected by the rotor sensor in a predetermined time interval. Then the die Motor driving the rotor shaft is controlled depending on a fluid volume flow to be conveyed according to a predetermined motor characteristic. The volume flow of fluid that is actually delivered is adjusted to the volume flow of fluid to be delivered by controlling the motor according to the motor characteristics.

Eine Weiterbildung des Verfahrens sieht hierbei insbesondere vor, dass der Motor angesteuert wird, die Rotorwelle auf der vorbestimmten Drehwinkelposition zu stoppen und zu positionieren, wenn der zu fördernde Volumenstrom null ist. Soll die Rotorwelle durch den Motor an der vorbestimmten Drehwinkelposition gestoppt werden, entspricht die Motorcharakteristik beispielsweise einem langsamen Abbremsen des Motors, wodurch die Rotorwelle ohne an der vorbestimmten Position überzuschwingen an dieser zum Stehen kommt.A development of the method provides in particular that the motor is controlled to stop and position the rotor shaft at the predetermined rotational angle position when the volume flow to be delivered is zero. If the rotor shaft is to be stopped by the motor at the predetermined rotational angle position, the motor characteristic corresponds, for example, to slow braking of the motor, as a result of which the rotor shaft comes to a standstill at the predetermined position without overshooting.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet bzw. werden nachstehend anhand der Figur näher dargestellt. Es zeigt:

Fig. 1
eine Orbitalpumpe mit geschnittenem Pumpengehäuse in einer Draufsicht auf den Pumpenring.
Other advantageous developments of the invention are characterized in the dependent claims or are presented in more detail below with reference to the figure. It shows:
1
an orbital pump with a sectioned pump housing in a plan view of the pump ring.

Die in Figur 1 schematisch dargestellte Pumpe ist mit einem Rotorsensor und einer Pumpensteuerung versehen, auch wenn diese in der Figur nicht zu erkennen sind.In the figure 1 The pump shown schematically is provided with a rotor sensor and a pump controller, even if these cannot be seen in the figure.

Das Pumpengehäuse 10 ist in einem orthogonal zu einer Längsachse verlaufenden Schnitt gezeigt, so dass der in dem Pumpengehäuse 10 liegende Hohlraum 14 mit den darin angeordneten Komponenten sichtbar ist. Als Teil des Pumpengehäuses 10 erstreck sich ein Fluideingang 11 mit einem Kanal in den Hohlraum 14 und ein Fluidausgang 12 mit einem Kanal aus dem Hohlraum 14. In dem Hohlraum 14 ist ein elastisch verformbarer Pumpenring 20 angeordnet. Durch das Zentrum des zylinderförmigen bzw. in der Schnittansicht rund ausgebildeten Hohlraums 14 verläuft die geschnitten dargestellte Rotorwelle 40 entlang einer nicht dargestellten Rotationsachse, welche sich entlang ihrer Achsrichtung orthogonal zu der Darstellungsebene erstreckt. An der Rotorwelle 40 ist ein Exzenter 30 angeordnet, welcher über einen Lagerring 32 zwischen dem Pumpenring 20 und dem Exzenter 30 auf den elastisch verformbaren Pumpenring 20 wirkt bzw. drückt. Der Lagerring 32 ist ein beispielsweise aus Nadelelementen gebildetes und als Radiallager ausgeführtes Nadellager, durch welches der Exzenter 30 in ihm ohne unmittelbar an dem verformbaren Pumpenring 20 anzuliegen, den Pumpenring 20 verformend in dem Pumpenring 20 rotieren kann. Mit der Rotorwelle 40 in seinem dargestellten Drehwinkel drückt der Exzenter 30 den Pumpenring 20 in die Exzenterrichtung 31, wodurch der elastisch verformbare Pumpenring 20 in seine in der Darstellungsebene liegende Radialrichtung verformt wird, so dass der Pumpenring 20 mit seinem Abschnitt 21 in Radialrichtung an dem Pumpengehäuse 10 anliegt. Durch eine Rotation des Exzenters in Umfangsrichtung U wandert der verformte Abschnitt 21 des Pumpenrings 20 in Umfangsrichtung U um die Rotationsachse, so dass der Abschnitt 21 in Umfangsrichtung rotiert, wobei der Pumpenring 20 sich dabei nicht dreht. Der Pumpenring 20 ist abschnittsweise von dem Pumpengehäuse 10 beabstandet und liegt nur im rotierenden Abschnitt 21 und in einem Dichtabschnitt 22 in Radialrichtung an dem Pumpengehäuse 10 an. Durch das Rotieren des rotierenden Abschnitts 21 des Pumpenrings 20 und der Beabstandung des Pumpenrings 20 von dem Pumpengehäuse 10 in Radialrichtung werden durch das Pumpengehäuse 10 und den Pumpenring 20 in dem Hohlraum 14 zwei sich in ihrer Größe durch die Rotation des rotierenden Abschnitts 21 verändernde Kammern bestimmt. In eine erste mit dem Fluideingang 11 verbundenen Kammer wird ein Fluid durch den Fluideingang 11 in den Hohlraum 14 bzw. in die sich vergrößernde erste Kammer gesaugt und aus der zweiten mit dem Fluidausgang 12 verbundenen Kammer wird ein Fluid aus dem Hohlraum 14 bzw. aus der sich verkleinernden zweiten Kammer ausgestoßen.The pump housing 10 is shown in a section running orthogonally to a longitudinal axis, so that the cavity 14 located in the pump housing 10 with the components arranged therein can be seen. As part of the pump housing 10, there is a fluid inlet 11 with a channel into the cavity 14 and a fluid outlet 12 with a channel from the cavity 14. In the cavity 14 there is an elastically deformable pump ring 20 arranged. The rotor shaft 40 shown in section runs through the center of the cylindrical cavity 14 or, in the sectional view, round cavity 14 along an axis of rotation, not shown, which extends along its axial direction orthogonally to the plane of the illustration. An eccentric 30 is arranged on the rotor shaft 40 and acts or presses on the elastically deformable pump ring 20 via a bearing ring 32 between the pump ring 20 and the eccentric 30 . The bearing ring 32 is a needle bearing formed, for example, from needle elements and designed as a radial bearing, through which the eccentric 30 can rotate in it without directly contacting the deformable pump ring 20, deforming the pump ring 20 in the pump ring 20. With the rotor shaft 40 in its illustrated angle of rotation, the eccentric 30 presses the pump ring 20 in the eccentric direction 31, as a result of which the elastically deformable pump ring 20 is deformed in its radial direction lying in the plane of the illustration, so that the pump ring 20 with its section 21 in the radial direction on the pump housing 10 is present. By rotating the eccentric in the circumferential direction U, the deformed section 21 of the pump ring 20 migrates in the circumferential direction U around the axis of rotation, so that the section 21 rotates in the circumferential direction, with the pump ring 20 not rotating. The pump ring 20 is spaced at a distance from the pump housing 10 in sections and rests against the pump housing 10 in the radial direction only in the rotating section 21 and in a sealing section 22 . The rotation of the rotating section 21 of the pump ring 20 and the spacing of the pump ring 20 from the pump housing 10 in the radial direction define two chambers in the cavity 14 which change in size as a result of the rotation of the rotating section 21 . A fluid is sucked into a first chamber connected to the fluid inlet 11 through the fluid inlet 11 into the cavity 14 or into the expanding first chamber, and a fluid is discharged from the second chamber connected to the fluid outlet 12 ejected from the cavity 14 or from the decreasing second chamber.

In Umfangsrichtung U zueinander benachbart bzw. über einen Winkelbereich in Umfangsrichtung U weist der Pumpenring 20 zwei Verformungsabschnitte 24, 25 auf. In dem ersten Verformungsabschnitt 24 wird auf den Pumpenring 20 in Radialrichtung durch den sich parallel zu der Rotationsachse erstreckenden Pin 13 bereits eine Verformungskraft aufgebracht. Hinzukommt, dass zwischen dem Pin 13 und dem Exzenter 30 ein an dem Pin 13 liegender Hohlraum in dem Pumpenring 20 gebildet ist, durch welchen sich der Pumpenring 20 in Radialrichtung einfacher deformieren lässt. Der Pumpenring 20 kann in dem ersten Verformungsabschnitt 24 auch weitere Maßnahmen zur gegenüber dem angrenzenden zweiten Verformungsabschnitt 25 leichteren Verformbarkeit aufweisen. Durch die leichtere Verformbarkeit in dem ersten Verformungsabschnitt 24 muss auf die Rotorwelle 40 bei einer Rotation über den Drehwinkelbereich, über welchen sich der erste Verformungsabschnitt 24 erstreckt, ein geringeres Drehmoment aufgebracht werden. Die vorbestimmte Drehwinkelposition liegt bei der beispielhaft gezeigten Pumpe daher symmetrisch zu dem Pin 13, auf der die Rotorwelle 40 und den Pin 13 halbierenden Geraden. Diese vorbestimmte Drehwinkelposition kann beispielsweise als 0° definiert sein, wobei der dargestellte Exzenter in einer um 90° entlang des Rotationspfades 33 verdrehten Drehwinkelposition dargestellt ist. Der Drehwinkel der Rotorwelle 40 kann bei der dargestellten Pumpe beispielsweise an der Rotorwelle 40, an dem Exzenter 30, an dem Pumpenring 20 durch den rotierenden Abschnitt 21 des Pumpenrings 20 oder an einem Rotor eines nicht dargestellten und die Rotorwelle 40 antreibenden Motors erfasst werden. Der Exzenter 30 ist vorliegend einteilig mit der Rotorwelle 40 verbunden, wobei die Rotorwelle 40 auch den Exzenter 30 einstückig bilden kann.The pump ring 20 has two deformation sections 24, 25 adjacent to one another in the circumferential direction U or over an angular range in the circumferential direction U. In the first deformation section 24, a deformation force is already applied to the pump ring 20 in the radial direction by the pin 13 extending parallel to the axis of rotation. In addition, between the pin 13 and the eccentric 30 there is a cavity in the pump ring 20 which is located on the pin 13 and through which the pump ring 20 can be deformed more easily in the radial direction. In the first deformation section 24 , the pump ring 20 can also have further measures for easier deformability in relation to the adjoining second deformation section 25 . Due to the easier deformability in the first deformation section 24, a lower torque has to be applied to the rotor shaft 40 during a rotation over the rotational angle range over which the first deformation section 24 extends. In the pump shown as an example, the predetermined rotational angle position is therefore symmetrical to the pin 13 on the straight line bisecting the rotor shaft 40 and the pin 13 . This predetermined rotational angle position can be defined as 0°, for example, with the illustrated eccentric being shown in a rotational angle position rotated by 90° along the rotation path 33 . In the pump shown, the angle of rotation of the rotor shaft 40 can be detected, for example, on the rotor shaft 40, on the eccentric 30, on the pump ring 20 by the rotating section 21 of the pump ring 20 or on a rotor of a motor that is not shown and drives the rotor shaft 40. In the present case, the eccentric 30 is connected in one piece to the rotor shaft 40, with the rotor shaft 40 also being able to form the eccentric 30 in one piece.

Claims (12)

  1. A pump, in particular an orbital pump, for pumping a fluid, wherein
    the pump comprises at least one pump control system, a motor that can be controlled by the pump control system, a rotor shaft (10) for fluid transport, and a rotor sensor for detecting an absolute angle of rotation of the rotor shaft (40),
    the rotor sensor is connected to the pump control system and designed to transmit the angle of rotation of the rotor shaft (40) to the pump control system, and
    the pump control system is designed to rotationally control the rotor shaft (40) by means of the motor until the rotor shaft (40) is in a pre-determined angle of rotation position, characterized in that
    between a fluid inlet (11) into the pump and a fluid outlet (12) from the pump, a leakage flow channel is determined in the pump, which channel is closed with the rotor shaft (40) in the pre-determined angle of rotation position, wherein a leakage flow between the fluid inlet (11) and the fluid outlet (12) is inhibited..
  2. The pump of the preceding claim, wherein
    the pump comprises a pump housing (10), an elastically deformable pump ring (20), and an eccentric (30) driven by or formed by the rotor shaft (40),
    the pump ring (20) is arranged in the pump housing (10) and is spaced from the pump housing (10) in its radial direction at least in sections,
    the pump ring (20) comprises a central opening in which the eccentric (30) is arranged, and
    a rotatable section (21) of the pump ring (20) is deformable in a radial direction by a rotation of the eccentric (30) in a circumferential direction (U) of the pump ring (20) and is pressable against the pump housing (10), wherein
    an angle of rotation of the rotatable section (21) of the pump ring (20) corresponds to the angle of rotation of the rotor shaft (40).
  3. The pump of the preceding claim, wherein
    the rotor sensor is arranged on the rotor shaft (40), on the eccentric (30) or on the pump ring (20) and detects the respective angle of rotation.
  4. The pump of any of the preceding claims, wherein
    the motor is an electric motor with a rotor, the rotor is directly connected to the rotor shaft (40), and the angle of rotation of the rotor shaft (40) corresponds to an angle of rotation of the rotor.
  5. The pump of any of the preceding claims 1 to 3, wherein
    the motor is an electric motor with a rotor, the rotor is indirectly connected to the rotor shaft (40), and the angle of rotation of the rotor shaft (40) can be determined from an angle of rotation of the rotor.
  6. The pump of any of the preceding claims 4 or 5, wherein
    the rotor sensor is arranged on the rotor and identifies the angle of rotation of the rotor.
  7. The pump of any of the preceding claims, wherein
    the rotor sensor is an encoder or a resolver detecting the angle of rotation of the rotor shaft (40).
  8. The pump of the preceding claim, wherein
    the rotor sensor is an absolute-value transducer.
  9. The pump of any of the preceding claims 1 to 7, wherein
    the rotor sensor is an incremental transducer, and the pump comprises a reference sensor detecting the position of the rotor shaft (40) in the pre-determined angle of rotation position for referencing the rotor sensor.
  10. The pump of any of the preceding claims 2 to 9, wherein
    the pump ring (20) comprises, when viewed in the circumferential direction (U), a first and a second deformation section (24, 25), the pump ring (20) is designed to be more elastically deformable in the first deformation section (24) than in its second deformation section (25), and wherein the pre-determined angle of rotation position is established in the first deformation section (24).
  11. A method for controlling a pump of any of the preceding claims, wherein
    a volumetric fluid flow transported through the pump from a fluid inlet (11) to a fluid outlet (12) of the pump is calculated from a plurality of angles of rotation of the rotor shaft (40) detected by the rotor sensor in a pre-determined time interval, and the motor driving the rotor shaft (40) is controlled depending on a volumetric fluid flow to be transported according to a pre-determined motor characteristic, and the volumetric fluid flow actually transported is matched to the volumetric fluid flow to be transported.
  12. The method of the preceding claim, wherein
    the motor is controlled to stop and position the rotor shaft (40) at the pre-determined angle of rotation position when the volumetric flow to be transported is zero.
EP19735541.5A 2018-07-26 2019-07-01 Pump with detection of absolute angle of rotation Active EP3768974B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018118100.0A DE102018118100A1 (en) 2018-07-26 2018-07-26 Pump with absolute rotation angle detection
PCT/EP2019/067542 WO2020020577A1 (en) 2018-07-26 2019-07-01 Pump with detection of absolute angle of rotation

Publications (2)

Publication Number Publication Date
EP3768974A1 EP3768974A1 (en) 2021-01-27
EP3768974B1 true EP3768974B1 (en) 2023-08-30

Family

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Application Number Title Priority Date Filing Date
EP19735541.5A Active EP3768974B1 (en) 2018-07-26 2019-07-01 Pump with detection of absolute angle of rotation

Country Status (5)

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US (1) US11644032B2 (en)
EP (1) EP3768974B1 (en)
CN (1) CN208718917U (en)
DE (1) DE102018118100A1 (en)
WO (1) WO2020020577A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021104816A1 (en) 2021-03-01 2022-09-01 Bayerische Motoren Werke Aktiengesellschaft Method for operating a peristaltic pump, peristaltic pump, motor vehicle and use of a peristaltic pump

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Also Published As

Publication number Publication date
DE102018118100A1 (en) 2020-01-30
CN208718917U (en) 2019-04-09
US20210262466A1 (en) 2021-08-26
WO2020020577A1 (en) 2020-01-30
US11644032B2 (en) 2023-05-09
EP3768974A1 (en) 2021-01-27

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