EP3768974A1 - Pump with detection of absolute angle of rotation - Google Patents

Pump with detection of absolute angle of rotation

Info

Publication number
EP3768974A1
EP3768974A1 EP19735541.5A EP19735541A EP3768974A1 EP 3768974 A1 EP3768974 A1 EP 3768974A1 EP 19735541 A EP19735541 A EP 19735541A EP 3768974 A1 EP3768974 A1 EP 3768974A1
Authority
EP
European Patent Office
Prior art keywords
pump
rotor
rotor shaft
rotation
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.)
Granted
Application number
EP19735541.5A
Other languages
German (de)
French (fr)
Other versions
EP3768974B1 (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
Original Assignee
Ebm Papst St Georgen GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebm Papst St Georgen GmbH and Co KG filed Critical Ebm Papst St Georgen GmbH and Co KG
Publication of EP3768974A1 publication Critical patent/EP3768974A1/en
Application granted granted Critical
Publication of EP3768974B1 publication Critical patent/EP3768974B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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
    • 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 recorded via three digital fall sensors, which, however, do not enable identification and allow detection of the angle of rotation of the rotor even with a resolution of 20 °.
  • the position of the rotor is determined indirectly by the Hall sensors via the position of the magnetic field which excites the rotor.
  • a problem that occurs especially in known orbital pumps is that an eccentric used when the orbital pump is switched off is stopped at an unpredictable position, that is to say with an undetermined angle of rotation. Due to the indefinite position of the eccentric, it is not excluded that the pump has an internal leakage, which can result in a leakage flow through which the undefined fluid flows through the pump. As a result, it is not possible to determine how much fluid was pumped by the pump or how much fluid a consumer connected to the pump, to whom the fluid is being pumped, is using a speed of the rotor. This would always require expensive volume flow sensors.
  • the invention is therefore based on the object to overcome the aforementioned disadvantages and to provide a pump and a method belonging to the pump, with which leakage through the pump is prevented and an exact positioning of the rotor in the pump is possible.
  • a pump in particular an orbital pump, for pumping a fluid.
  • the pump has at least one pump controller and a motor that can be controlled by the pump controller.
  • the pump also 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 conveyed or drive another component of the pump, which acts directly on the fluid without being in contact with the fluid itself.
  • the rotor sensor is connected to the at least one pump control and is also designed to transmit the angle of rotation of the rotor shaft to the pump control.
  • 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 prevents the overshoot of the rotor shaft, taking into account the angle of rotation, and thereby increases the service life of the pump.
  • the exact positioning of the rotor shaft means that a cavity (delivery chamber) arranged in the pump can only be partially emptied by rotating the rotor shaft, for example, by a predetermined angle. Since no complete revolutions are required to convey the fluid, even small amounts of fluid can be delivered. If the angle of rotation or the more precise angle of rotation position of the rotor shaft be known, a pump according to the invention can also be calibrated for specific delivery quantities. Such a calibration can be carried out, for example, during manufacture, but also with a pump installed in a system.
  • the volume delivered by the pump can be measured and linked to the occurring rotational angle positions, so that for each pump individually It is determined which volume is conveyed with which change in the angle of rotation. If a certain amount of fluid (volume) is to be pumped later, the determined values can be used to determine which new rotational angle position is to be approached with the rotor shaft based on a current rotational angle position.
  • the calibration can, for example, also be repeated at predetermined maintenance intervals in order to take possible mechanical wear into account and to be able to compensate for it by the control.
  • a pump according to the invention and an associated control can also be used to close the rotor shaft when the pump is switched off or when the rotor shaft is stopped in a predetermined starting position or in one of several predetermined starting positions position. In a subsequent start-up process, a lower starting current is therefore necessary, so that the pump is subject to little wear and has a low current consumption.
  • the pump has a pump housing, an elastically deformable pump ring and an eccentric.
  • the eccentric defines an eccentric 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 so that the rotor shaft is the eccentric.
  • the pump housing has a cylindrical recess or cavity, from which a fluid inlet and a fluid outlet extend from or into the pump housing.
  • the pump ring is arranged in the cavity or in the pump housing and at least in sections in its radial direction from the pump housing spaced.
  • the pump ring has a central opening which extends in the axial direction of the pump ring and is preferably centered in its radial direction in the pump ring and in which the eccentric is arranged. Due to the eccentric eccentric with respect to the central opening, the pump ring is elastically deformed by the eccentric.
  • the eccentric has a section which protrudes further from its axis of rotation about which it is rotated than the surrounding regions of the eccentric. 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.
  • Pump ring corresponds to the angle of rotation of the rotor shaft, so that the position of the rotatable section corresponds to the position of the rotor shaft given the angle of rotation.
  • 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 by the angle of rotation of the rotor.
  • the motor is an electric motor with a rotor, but the rotor is not connected directly to the rotor shaft, but indirectly, for example via a transmission.
  • the angle of rotation of the rotor shaft can be determined from an angle of rotation of the rotor, the angle of rotation depending on the connection of the rotor to the rotor shaft, for example the transmission ratio of the transmission, being determinable.
  • 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 the resolver can output the angle of rotation as a digital signal or as an analog signal. Outputs as sine and cosine signals are particularly possible.
  • the rotor sensor is preferably an absolute encoder, so that no referencing of the rotor shaft is necessary.
  • the rotor shaft should preferably be stopped at a predetermined position and the starting angle 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 for
  • Referencing the rotor sensor has a reference sensor that detects the position of the rotor shaft in the predetermined rotational angle position.
  • the pump ring has a first and a second deformation section.
  • the pump ring is designed to be more elastically deformable in the first deformation section than in its second deformation section.
  • the pump ring In the first deformation section, the pump ring can thus be easily deformed in its radial direction by the eccentric, so that the eccentric for deforming the pump ring requires a lower force in the first deformation section or less 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. When the eccentric begins to rotate from a standstill of the eccentric, a lower torque is therefore necessary at the eccentric in the first deformation section than when the rotation begins in the second deformation section.
  • a leakage flow channel in the pump is determined between a fluid inlet into the pump and a fluid outlet from the pump.
  • 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 portion 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 rotational angles of the rotor shaft detected by the rotor sensor in a predetermined time interval.
  • the motor driving the rotor shaft is controlled depending on a fluid volume flow to be pumped according to a predetermined motor characteristic.
  • the actually conveyed fluid volume flow is adjusted to the fluid volume flow to be conveyed by controlling the motor in accordance with the motor characteristics.
  • a further development of the method provides in particular that the motor is controlled to stop and position the rotor shaft at the predetermined angle of rotation position and to position it when the volume flow to be conveyed is zero. If the rotor shaft is to be stopped by the motor at the predetermined rotational angular position, the motor characteristic corresponds, for example, to a slow braking of the motor, as a result of which the rotor shaft comes to a stop without overshooting at the predetermined position.
  • Fig. 1 shows an orbital pump with a cut pump housing in one
  • the pump shown schematically in Figure 1 is provided with a rotor sensor and a pump control, even if these are not to be seen in the figure.
  • the pump housing 10 is shown in a section orthogonal to a longitudinal axis, so that the cavity 14 lying in the pump housing 10 with the components arranged therein is visible.
  • a fluid inlet 11 with a channel extends into the cavity 14 and a fluid outlet 12 with a channel from the cavity 14.
  • An elastically deformable pump ring 20 is arranged in the cavity 14.
  • the rotor shaft 40 shown in section runs along an axis of rotation, not shown, which extends along its axis direction orthogonal to the plane of representation.
  • An eccentric 30 is arranged on the rotor shaft 40, which eccentric via a bearing ring 32 between the pump ring 20 and the eccentric 30 on the elastic table-shaped pump ring 20 acts or presses.
  • the bearing ring 32 is a needle bearing, for example formed from needle elements and designed as a radial bearing, through which the eccentric 30 can rotate in it without deforming directly against the deformable pump ring 20, the pump ring 20 deforming 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 moves in the circumferential direction U around the axis of rotation, so that the section 21 rotates in the circumferential direction, the pump ring 20 not rotating.
  • the pump ring 20 is in sections from the pump housing 10
  • Spacing of the pump ring 20 from the pump housing 10 in the radial direction are determined by the pump housing 10 and the pump ring 20 in the cavity 14 two in size by the rotation of the rotating section 21 changing chambers.
  • a fluid is sucked through the fluid inlet 11 into the cavity 14 or into the enlarging first chamber, and a fluid from the cavity 14 or out of the second chamber is connected to the fluid outlet 12 shrinking second
  • 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.
  • the pump ring 20 is driven in the radial direction through which extends parallel to the axis of rotation. already applied a deforming force.
  • a cavity lying on the pin 13 is formed in the pump ring 20, through which the pump ring 20 can be deformed more easily in the radial direction.
  • the pump ring 20 can also have further measures in the first deformation section 24 to make it easier to deform than the adjacent second deformation section 25.
  • the predetermined rotational angle position is therefore symmetrical to pin 13, on which the rotor shaft 40 and the pin 13 bisect straight lines.
  • This predetermined rotational angle position can be defined, for example, as 0 °, the eccentric shown 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, not shown, which drives the rotor shaft 40 ,
  • the eccentric 30 is connected in one piece to the rotor shaft 40, wherein the rotor shaft 40 can also 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)

Abstract

The invention relates to 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.

Description

Pumpe mit absoluter Drehwinkel-Erfassung  Pump with absolute rotation angle detection
Beschreibung: Description:
Die Erfindung betrifft eine Pumpe, insbesondere eine Orbitalpumpe, zum Pumpen eines Fluides. Die Pumpe weist hierzu einen Rotorsensor zur Erfas- sung eines absoluten Drehwinkels einer Rotorwelle der Pumpe sowie eine vorbestimmten Drehwinkelposition auf. 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 Flall-Sensoren erfasst, welche jedoch keine absolute Rotorlagener- kennung 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. 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 Ro- tor 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. Neben den Nachteilen des„Open-Loop“-Betriebs kommt es ferner zu weite- ren 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. Da- durch wird beispielsweise eine Membran oder ein anderes elastisches Ele- ment, 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. 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. Various embodiments of pumps with an angle of rotation detection are already known from the prior art. For example, in a known solution, a rotational angle position of a rotor is recorded via three digital fall sensors, which, however, do not enable identification and allow detection of the angle of rotation of the rotor even with a resolution of 20 °. The position of the rotor is determined indirectly by the Hall sensors via the position of the magnetic field which excites the rotor. With such a detection of the angle of rotation, many pumps which are common in the prior art are actuated in “open-loop” operation, in which a certain 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 exactly. Due to an increased load on the rotor, the rotor may run after 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. In addition to the disadvantages of “open loop” operation, there are also further restrictions and disadvantages for the pumps. For example, in the case of the rotors which are widespread in pumps in the prior art, there is an undefined overshoot of the rotor around an approached position. As a result, for example, a membrane or another elastic element which is connected to the rotor is subjected to greater stress than without overshoot, with the result that increased wear on the elastic element occurs. The overshoot also increases a metering or delivery variance, since the movement of the rotor around the position it moves to further overshoots an undefined fluid through the pump.
Hinzukommt, dass es nicht möglich ist, die absolute Position des Rotors zu ermitteln oder den Rotor auf eine bestimmte Position zu positionieren, insbe- sondere, 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 at a specific position, especially since the resolution is common with many rotor sensors used in pumps is too small 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 Drehwin kel gestoppt wird. Durch die unbestimmte Lage des Exzenters ist nicht aus geschlossen, 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 Volumenstrom sensoren vorgesehen werden. A problem that occurs especially in known orbital pumps is that an eccentric used when the orbital pump is switched off is stopped at an unpredictable position, that is to say with an undetermined angle of rotation. Due to the indefinite position of the eccentric, it is not excluded that the pump has an internal leakage, which can result in a leakage flow through which the undefined fluid flows through the pump. As a result, it is not possible to determine how much fluid was pumped by the pump or how much fluid a consumer connected to the pump, to whom the fluid is being pumped, is using a speed of the rotor. This would always require expensive volume flow sensors.
Der Erfindung liegt deshalb die Aufgabe zugrunde, die vorgenannten Nach- teile zu überwinden und eine Pumpe sowie ein zu der Pumpe gehörendes Verfahren bereitzustellen, mit welcher eine Leckage durch die Pumpe ver hindert wird und eine exakte Positionierung des Rotors in der Pumpe möglich ist. The invention is therefore based on the object to overcome the aforementioned disadvantages and to provide a pump and a method belonging to the pump, with which leakage through the pump is prevented and an 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 Berücksichti- gung 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, for pumping a fluid is proposed. The pump has at least one pump controller and a motor that can be controlled by the pump controller. The pump also 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 conveyed or drive another component of the pump, which acts directly on the fluid without being in contact with the fluid itself. The rotor sensor is connected to the at least one pump control and is also designed to transmit the angle of rotation of the rotor shaft to the pump control. 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 vor bestimmte 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 a repetitive pumping process can always deliver an equal amount of fluid. In particular, the control prevents the overshoot of the rotor shaft, taking into account the angle of rotation, 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 Förde rung des Fluides notwendig sind, können auch kleine Fluidmengen gefördert werden. Sind die Drehwinkel bzw. die genauer Drehwinkelposition der Rotorwelle be kannt kann eine erfindungsgemäße Pumpe zudem für bestimmte Förder mengen 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 ge- fördert 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 Drehwin- kelposition mit der Rotorwelle ausgehend von einer aktuellen Drehwinkelpo- sition 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. In addition, the exact positioning of the rotor shaft means that a cavity (delivery chamber) arranged in the pump can only be partially emptied by rotating the rotor shaft, for example, by a predetermined angle. Since no complete revolutions are required to convey the fluid, even small amounts of fluid can be delivered. If the angle of rotation or the more precise angle of rotation position of the rotor shaft be known, a pump according to the invention can also be calibrated for specific delivery quantities. Such a calibration can be carried out, for example, during manufacture, but also with a pump installed in a system. If predetermined amounts of fluid are to be conveyed by the pump or it is to be determined which amount is to be conveyed per revolution or when the angle of rotation of the rotor shaft is changed, the volume delivered by the pump can be measured and linked to the occurring rotational angle positions, so that for each pump individually It is determined which volume is conveyed with which change in the angle of rotation. If a certain amount of fluid (volume) is to be pumped later, the determined values can be used to determine which new rotational angle position is to be approached with the rotor shaft based on a current rotational angle position. The calibration can, for example, also be repeated at predetermined maintenance intervals in order to take possible mechanical wear into account and to be able to compensate for it by the control.
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 ei- ne geringe Stromaufnahme aufweist. To start up a pump with the rotor shaft at a standstill, different starting currents are required depending on the angle of rotation position. In order to enable the pump to start up with the lowest possible currents, a pump according to the invention and an associated control can also be used to close the rotor shaft when the pump is switched off or when the rotor shaft is stopped in a predetermined starting position or in one of several predetermined starting positions position. In a subsequent start-up process, a lower starting current is therefore necessary, so that the pump is subject to little wear and has a low current 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 Ex- zenter ist. Das Pumpengehäuse weist eine zylinderförmige Ausnehmung bzw. Hohlraum auf, von welchem sich aus ein Fluideingang und ein Fluid ausgang 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 ange- ordnet 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 Um- fangsrichtung 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 Pumpen- rings wandert bzw. rotiert. Ein Drehwinkel des rotierbaren Abschnitts desAn 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 eccentric 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 so that the rotor shaft is the eccentric. The pump housing has a cylindrical recess or cavity, from which a fluid inlet and a fluid outlet extend from or into the pump housing. The pump ring is arranged in the cavity or in the pump housing and at least in sections in its radial direction from the pump housing spaced. The pump ring has a central opening which extends in the axial direction of the pump ring and is preferably centered in its radial direction in the pump ring and in which the eccentric is arranged. Due to the eccentric eccentric with respect to the central opening, the pump ring is elastically deformed by the eccentric. For this purpose, the eccentric has a section which protrudes further from its axis of rotation about which it is rotated than the surrounding regions of the eccentric. 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 portion of the pump ring that is deformed migrates or rotates around the axis of rotation or in the circumferential direction of the pump ring. An angle of rotation of the rotatable portion of the
Pumpenrings entspricht dem Drehwinkel der Rotorwelle, womit durch die als Drehwinkel angegebene Position der Rotorwelle der Position des rotierbaren Abschnitts entspricht. Pump ring corresponds to the angle of rotation of the rotor shaft, so that the position of the rotatable section corresponds to the position of the rotor shaft given the angle of rotation.
Der Rotorsensor ist bei einer vorteilhaften Weiterbildung an der Rotorwelle, an dem Exzenter oder an dem Pumpenring angeordnet und erfasst den ab soluten Drehwinkel als den jeweiligen Drehwinkel der Rotorwelle, des Exzen- ters oder des Pumpenrings. Da der Pumpenring selbst nicht rotiert, wird hier- bei die Position des rotierenden Abschnitts des Pumpenrings erfasst. In an advantageous further 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. Alternativ sieht eine Weiterbildung vor, dass der Motor ein Elektromotor mit einem Rotor ist, der Rotor jedoch nicht unmittelbar, sondern mittelbar, bei spielsweise über ein Getriebe, mit der Rotorwelle verbunden ist. Der Dreh winkel der Rotorwelle ist aus einem Drehwinkel des Rotors bestimmbar, wo- bei der Drehwinkel abhängig von der Verbindung des Rotors mit der Rotor welle, beispielsweise dem Übersetzungsverhältnis des Getriebes, bestimmbar 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 by the angle of rotation of the rotor. Alternatively, a further development provides that the motor is an electric motor with a rotor, but the rotor is not connected directly to the rotor shaft, but indirectly, for example via a transmission. The angle of rotation of the rotor shaft can be determined from an angle of rotation of the rotor, the angle of rotation depending on the connection of the rotor to the rotor shaft, for example the transmission ratio of the transmission, being determinable.
Der Rotorsensor ist bei einer möglichen Ausgestaltungsvariante der Erfin dung 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 Aus- gäbe 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 the resolver can output the angle of rotation as a digital signal or as an analog signal. Outputs as sine and cosine signals are particularly possible.
Vorzugsweise ist der Rotorsensor ein Absolutwertgeber, wodurch keine Referenzierung der Rotorwelle notwendig ist. The rotor sensor is preferably an absolute encoder, so that no referencing of the rotor shaft is necessary.
Da die Rotorwelle jedoch vorzugweise an einer vorbestimmten Position ge stoppt werden soll und bei einem Anfahren aus dieser Position der Drehwin- kel der Rotorwelle bekannt ist, sieht eine alternative Ausführungsform vor, dass der Rotorsensor ein Inkrementalgeber ist und die Pumpe zur However, since the rotor shaft should preferably be stopped at a predetermined position and the starting angle 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 for
Referenzierung des Rotorsensors einen Referenzsensor aufweist, der die Position der Rotorwelle in der vorbestimmten Drehwinkelposition erfasst. Referencing the rotor sensor has a reference sensor that detects the position of the rotor shaft 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 Pumpen- ring dadurch in seine Radialrichtung einfach von dem Exzenter verformbar, so dass der Exzenter zum Verformen des Pumpenrings in dem ersten Ver- formungsabschnitt 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 Drehmo- ment an dem Exzenter notwendig als bei einem Beginn der Rotation in dem zweiten Verformungsabschnitt. Zwischen einem Fluideingang in die Pumpe und einem Fluidausgang aus der Pumpe ist ein Leckage-Strömungskanal in der Pumpe bestimmt. Eine vor teilhafte Weiterbildungsvariante der Erfindung sieht vor, 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 rotie rende Abschnitt des Pumpenrings von dem Exzenter auf den Fluideingang oder den Fluidausgang gedrückt, so dass dieser von einer Stirnseite des Pumpenrings fluiddicht abgedichtet ist. Viewed in the circumferential direction, the pump ring has a first and a second deformation section. The pump ring is designed to be more elastically deformable in the first deformation section than in its second deformation section. In the first deformation section, the pump ring can thus be easily deformed in its radial direction by the eccentric, so that the eccentric for deforming the pump ring requires a lower force in the first deformation section or less 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. When the eccentric begins to rotate from a standstill of the eccentric, a lower torque is therefore necessary at the eccentric in the first deformation section than when the rotation begins in the second deformation section. A leakage flow channel in the pump is determined between a fluid inlet into the pump and a fluid outlet from the pump. A before further development variant of the invention provides 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 portion 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 erfin- dungsgemäßen 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 er fassten Drehwinkeln der Rotorwelle berechnet. Anschließend wird der die Rotorwelle antreibende Motor abhängig von einem zu fördernden Fluid- Volumenstrom nach einer vorbestimmten Motorcharakteristik angesteuert.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 rotational angles of the rotor shaft detected by the rotor sensor in a predetermined time interval. Subsequently, the motor driving the rotor shaft is controlled depending on a fluid volume flow to be pumped according to a predetermined motor characteristic.
Der tatsächlich geförderte Fluid-Volumenstrom wird durch die Ansteuerung des Motors entsprechend der Motorcharakteristik dem zu fördernden Fluid- Volumenstrom angeglichen. Eine Weiterbildung des Verfahrens sieht hierbei insbesondere vor, dass der Motor angesteuert wird, die Rotorwelle auf der vorbestimmten Drehwinkelpo sition zu stoppen und zu positionieren, wenn der zu fördernde Volumenstrom null ist. Soll die Rotorwelle durch den Motor an der vorbestimmten Drehwin- kelposition gestoppt werden, entspricht die Motorcharakteristik beispielswei- se einem langsamen Abbremsen des Motors, wodurch die Rotorwelle ohne an der vorbestimmten Position überzuschwingen an dieser zum Stehen kommt. The actually conveyed fluid volume flow is adjusted to the fluid volume flow to be conveyed by controlling the motor in accordance with the motor characteristics. A further development of the method provides in particular that the motor is controlled to stop and position the rotor shaft at the predetermined angle of rotation position and to position it when the volume flow to be conveyed is zero. If the rotor shaft is to be stopped by the motor at the predetermined rotational angular position, the motor characteristic corresponds, for example, to a slow braking of the motor, as a result of which the rotor shaft comes to a stop without overshooting at the predetermined position.
Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprü- chen gekennzeichnet bzw. werden nachstehend anhand der Figur näher dargestellt. Es zeigt: Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below with reference to the figure. It shows:
Fig. 1 eine Orbitalpumpe mit geschnittenem Pumpengehäuse in einer Fig. 1 shows an orbital pump with a cut pump housing in one
Draufsicht auf den Pumpenring.  Top 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 er kennen sind. The pump shown schematically in Figure 1 is provided with a rotor sensor and a pump control, even if these are not to be seen in the figure.
Das Pumpengehäuse 10 ist in einem orthogonal zu einer Längsachse verlau- fenden 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 Schnittan sicht 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 elas- tisch verformbaren Pumpenring 20 wirkt bzw. drückt. Der Lagerring 32 ist ein beispielsweise aus Nadelelementen gebildetes und als Radiallager ausge führtes Nadellager, durch welches der Exzenter 30 in ihm ohne unmittelbar an dem verformbaren Pumpenring 20 anzuliegen, den Pumpenring 20 ver- formend in dem Pumpenring 20 rotieren kann. Mit der Rotorwelle 40 in sei nem 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 Umfangs richtung U wandert der verformte Abschnitt 21 des Pumpenrings 20 in Um fangsrichtung U um die Rotationsachse, so dass der Abschnitt 21 in Um fangsrichtung rotiert, wobei der Pumpenring 20 sich dabei nicht dreht. Der Pumpenring 20 ist abschnittsweise von dem Pumpengehäuse 10 The pump housing 10 is shown in a section orthogonal to a longitudinal axis, so that the cavity 14 lying in the pump housing 10 with the components arranged therein is visible. As part of the pump housing 10, a fluid inlet 11 with a channel extends into the cavity 14 and a fluid outlet 12 with a channel from the cavity 14. An elastically deformable pump ring 20 is arranged in the cavity 14. Through the center of the cylindrical or in the sectional view round formed cavity 14, the rotor shaft 40 shown in section runs along an axis of rotation, not shown, which extends along its axis direction orthogonal to the plane of representation. An eccentric 30 is arranged on the rotor shaft 40, which eccentric via a bearing ring 32 between the pump ring 20 and the eccentric 30 on the elastic table-shaped pump ring 20 acts or presses. The bearing ring 32 is a needle bearing, for example formed from needle elements and designed as a radial bearing, through which the eccentric 30 can rotate in it without deforming directly against the deformable pump ring 20, the pump ring 20 deforming 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 moves in the circumferential direction U around the axis of rotation, so that the section 21 rotates in the circumferential direction, the pump ring 20 not rotating. The pump ring 20 is in sections from the pump housing 10
beabstandet und liegt nur im rotierenden Abschnitt 21 und in einem Dichtab schnitt 22 in Radialrichtung an dem Pumpengehäuse 10 an. Durch das Ro tieren des rotierenden Abschnitts 21 des Pumpenrings 20 und der spaced and is only in the rotating section 21 and in a Dichtab section 22 in the radial direction on the pump housing 10. By ro tieren the rotating portion 21 of the pump ring 20 and
Beabstandung des Pumpenrings 20 von dem Pumpengehäuse 10 in Radial richtung werden durch das Pumpengehäuse 10 und den Pumpenring 20 in dem Hohlraum 14 zwei sich in ihrer Größe durch die Rotation des rotieren den 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 zweitenSpacing of the pump ring 20 from the pump housing 10 in the radial direction are determined by the pump housing 10 and the pump ring 20 in the cavity 14 two in size by the rotation of the rotating section 21 changing chambers. In a first chamber connected to the fluid inlet 11, a fluid is sucked through the fluid inlet 11 into the cavity 14 or into the enlarging first chamber, and a fluid from the cavity 14 or out of the second chamber is connected to the fluid outlet 12 shrinking second
Kammer ausgestoßen. Chamber ejected.
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 erstre- ckenden Pin 13 bereits eine Verformungskraft aufgebracht. Hinzukommt, dass zwischen dem Pin 13 und dem Exzenter 30 ein an dem Pin 13 liegen- der Hohlraum in dem Pumpenring 20 gebildet ist, durch welchen sich der Pumpenring 20 in Radialrichtung einfacher deformieren lässt. Der Pumpen- ring 20 kann in dem ersten Verformungsabschnitt 24 auch weitere Maßnah men 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 Verfor- mungsabschnitt 24 erstreckt, ein geringeres Drehmoment aufgebracht wer den. 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 dar gestellt 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 antrei- benden 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, the pump ring 20 is driven in the radial direction through which extends parallel to the axis of rotation. already applied a deforming force. In addition, between the pin 13 and the eccentric 30, a cavity lying on the pin 13 is formed in the pump ring 20, through which the pump ring 20 can be deformed more easily in the radial direction. The pump ring 20 can also have further measures in the first deformation section 24 to make it easier to deform than the adjacent 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 rotation over the rotation angle range over which the first deformation section 24 extends. In the pump shown by way of example, the predetermined rotational angle position is therefore symmetrical to pin 13, on which the rotor shaft 40 and the pin 13 bisect straight lines. This predetermined rotational angle position can be defined, for example, as 0 °, the eccentric shown 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, not shown, which drives the rotor shaft 40 , In the present case, the eccentric 30 is connected in one piece to the rotor shaft 40, wherein the rotor shaft 40 can also form the eccentric 30 in one piece.

Claims

Patentansprüche claims
1. Pumpe, insbesondere eine Orbitalpumpe, zum Pumpen eines Fluides, wobei 1. Pump, in particular an orbital pump, for pumping a fluid, wherein
die Pumpe wenigstens eine Pumpensteuerung, einen durch die Pumpensteuerung steuerbaren Motor, eine Rotorwelle (10) zur Fluid förderung und einen Rotorsensor zur Erfassung eines absoluten Drehwinkels der Rotorwelle (40) aufweist,  the pump has at least one pump controller, a motor controllable by the pump controller, a rotor shaft (10) for fluid delivery and a rotor sensor for detecting an absolute angle of rotation of the rotor shaft (40),
der Rotorsensor mit der Pumpensteuerung verbunden und ausgebildet ist, den Drehwinkel der Rotorwelle (40) an die Pumpen- Steuerung zu übermitteln, und  the rotor sensor is connected to the pump control and is designed to transmit the angle of rotation of the rotor shaft (40) to the pump control, and
die Pumpensteuerung ausgebildet ist, über den Motor die Ro torwelle (40) rotierend anzusteuern, bis die Rotorwelle (40) in einer vorbestimmten Drehwinkelposition steht.  the pump control is designed to drive the rotor shaft (40) in a rotating manner until the rotor shaft (40) is in a predetermined rotational angle position.
2. Pumpe nach dem vorhergehenden Anspruch, wobei 2. Pump according to the preceding claim, wherein
die Pumpe ein Pumpengehäuse (10), einen elastisch verformbaren Pumpenring (20) und einen Exzenter (30) aufweist, welcher von der Rotorwelle (40) angetrieben oder von ihr gebildet ist,  the pump has a pump housing (10), an elastically deformable pump ring (20) and an eccentric (30) which is driven by or formed by the rotor shaft (40),
der Pumpenring (20) in dem Pumpengehäuse (10) angeordnet und zumindest abschnittsweise in seine Radialrichtung von dem Pum- pengehäuse (10) beabstandet ist,  the pump ring (20) is arranged in the pump housing (10) and is at least partially spaced in its radial direction from the pump housing (10),
der Pumpenring (20) eine Zentralöffnung aufweist, in welcher der Exzenter (30) angeordnet ist und  the pump ring (20) has a central opening in which the eccentric (30) is arranged and
ein rotierbarer Abschnitt (21) des Pumpenrings (20), der durch eine Rotation des Exzenters (30) in Umfangsrichtung (U) des Pum- penrings (20) in Radialrichtung verformbar und an das Pumpengehäuse (10) drückbar ist, wobei  a rotatable section (21) of the pump ring (20) which can be deformed in the radial direction by rotating the eccentric (30) in the circumferential direction (U) of the pump ring (20) and can be pressed against the pump housing (10), wherein
ein Drehwinkel des rotierbaren Abschnitts (21) des Pumpenrings (20) dem Drehwinkel der Rotorwelle (40) entspricht. 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. Pumpe nach dem vorhergehenden Anspruch, wobei 3. Pump according to the preceding claim, wherein
der Rotorsensor an der Rotorwelle (40), an dem Exzenter (30) oder an dem Pumpenring (20) angeordnet ist und den jeweiligen Dreh Winkel erfasst.  the rotor sensor is arranged on the rotor shaft (40), on the eccentric (30) or on the pump ring (20) and detects the respective rotation angle.
4. Pumpe nach einem der vorhergehenden Ansprüche, wobei 4. Pump according to one of the preceding claims, wherein
der Motor ein Elektromotor mit einem Rotor ist, der Rotor unmit telbar mit der Rotorwelle (40) verbunden ist und der Drehwinkel der Rotorwelle (40) einem Drehwinkel des Rotors entspricht.  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. Pumpe nach einem der vorhergehenden Ansprüche 1 bis 3, wobei der Motor ein Elektromotor mit einem Rotor ist, der Rotor mit telbar mit der Rotorwelle (40) verbunden ist und der Drehwinkel der Rotorwelle (40) aus einem Drehwinkel des Rotors bestimmbar ist. 5. Pump according to one of the preceding claims 1 to 3, wherein the motor is an electric motor with a rotor, the rotor is telbar 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. Pumpe nach einem der vorhergehenden Ansprüche 4 oder 5, wobei der Rotorsensor an dem Rotor angeordnet ist und den Dreh- Winkel des Rotors ermittelt. 6. Pump according to one of the preceding claims 4 or 5, wherein the rotor sensor is arranged on the rotor and determines the angle of rotation of the rotor.
7. Pumpe nach einem der vorhergehenden Ansprüche, wobei 7. Pump according to one of the preceding claims, wherein
der Rotorsensor ein Encoder oder ein Resolver ist, der den Drehwinkel der Rotorwelle (40) erfasst.  the rotor sensor is an encoder or a resolver that detects the angle of rotation of the rotor shaft (40).
8. Pumpe nach dem vorhergehenden Anspruch, wobei 8. Pump according to the preceding claim, wherein
der Rotorsensor ein Absolutwertgeber ist.  the rotor sensor is an absolute encoder.
9. Pumpe nach einem der vorhergehenden Ansprüche 1 bis 7, wobei der Rotorsensor ein Inkrementalgeber ist und die Pumpe zur Referenzierung des Rotorsensors einen Referenzsensor aufweist, der die Position der Rotorwelle (40) in der vorbestimmten Drehwinkelposi- tion erfasst. 9. Pump according to one of the preceding claims 1 to 7, wherein the rotor sensor is an incremental encoder and the pump for referencing the rotor sensor has a reference sensor which detects the position of the rotor shaft (40) in the predetermined angle of rotation position.
10. Pumpe nach einem der vorhergehenden Ansprüche 2 bis 9, wobei der Pumpenring (20) in Umfangsrichtung (U) gesehen einen ersten und einen zweiten Verformungsabschnitt (24, 25) aufweist, der Pumpenring (20) in dem ersten Verformungsabschnitt (24) elastischer verformbar ausgebildet ist als in seinem zweiten Verformungsab- schnitt (25), und wobei die vorbestimmte Drehwinkelposition in dem ersten Verformungsabschnitt (24) festgelegt ist. 10. Pump according to one of the preceding claims 2 to 9, wherein the pump ring (20) has a first and a second deformation section (24, 25) seen in the circumferential direction (U), 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 predetermined rotational angle position is set in the first deformation portion (24).
11. Pumpe nach einem der vorhergehenden Ansprüche, wobei 11. Pump according to one of the preceding claims, wherein
zwischen einem Fluideingang (11) in die Pumpe und einem Fluidausgang (12) aus der Pumpe ein Leckage-Strömungskanal in der Pumpe bestimmt ist, welcher mit der Rotorwelle (40) in der vorbe- stimmten Drehwinkelposition verschlossen ist, wobei eine Leckage- Strömung zwischen dem Fluideingang (11) und dem Fluidausgang (12) verhindert ist.  Between a fluid inlet (11) in the pump and a fluid outlet (12) from the pump, a leakage flow channel is determined in the pump, which is closed with the rotor shaft (40) in the predetermined angular position, with a leakage flow between the fluid inlet (11) and the fluid outlet (12) is prevented.
12. Verfahren zur Ansteuerung einer Pumpe nach einem der vorherge- henden Ansprüche, wobei 12. A method for controlling a pump according to one of the preceding claims, wherein
ein durch die Pumpe von einem Fluideingang (11) zu einem Fluidausgang (12) der Pumpe geförderter Fluid-Volumenstrom aus mehreren in einem vorbestimmten Zeitintervall durch den Rotorsensor erfassten Drehwinkeln der Rotorwelle (40) berechnet und der die Ro- torwelle (40) antreibende Motor abhängig von einem zu fördernden a fluid volume flow conveyed by the pump from a fluid inlet (11) to a fluid outlet (12) of the pump is calculated from a plurality of rotation angles of the rotor shaft (40) detected by the rotor sensor in a predetermined time interval, and the motor driving the rotor shaft (40) depending on one to be funded
Fluid-Volumenstrom nach einer vorbestimmten Motorcharakteristik angesteuert wird, und der tatsächlich geförderte Fluid-Volumenstrom dem zu fördernden Fluid-Volumenstrom angeglichen wird. Fluid volume flow is controlled according to a predetermined engine characteristic, and the actually conveyed fluid volume flow is adjusted to the fluid volume flow to be conveyed.
13. Verfahren nach dem vorhergehenden Anspruch, wobei 13. The method according to the preceding claim, wherein
der Motor angesteuert wird, die Rotorwelle (40) auf der vorbe stimmten Drehwinkelposition zu stoppen und zu positionieren, wenn der zu fördernde Volumenstrom null ist.  the motor is driven to stop and position the rotor shaft (40) at the predetermined angular position when the volume flow to be conveyed 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

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

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

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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
WO2020020577A1 (en) 2020-01-30
EP3768974B1 (en) 2023-08-30
US11644032B2 (en) 2023-05-09
DE102018118100A1 (en) 2020-01-30
US20210262466A1 (en) 2021-08-26
CN208718917U (en) 2019-04-09

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