EP3768974A1 - Pompe avec détection d'angle de rotation absolu - Google Patents

Pompe avec détection d'angle de rotation absolu

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)
English (en)
Other versions
EP3768974B1 (fr
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/fr
Application granted granted Critical
Publication of EP3768974B1 publication Critical patent/EP3768974B1/fr
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.

Landscapes

  • 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

L'invention concerne une pompe orbitale destinée à pomper un fluide. La pompe comporte au moins une commande, un moteur commandable par la commande, un arbre de rotor (10) destiné à la distribution de fluide et un capteur de rotor destiné à détecter un angle de rotation absolu de l'arbre de rotor (40). Le capteur de rotor est relié à la commande de pompe et est conçu pour transmettre l'angle de rotation de l'arbre de rotor (40) à la commande de pompe, et la commande de pompe est conçue pour commander l'arbre de rotor (40) d'une manière rotative par le biais du moteur jusqu'à ce que l'arbre de rotor (40) soit dans une position d'angle de rotation prédéterminée.
EP19735541.5A 2018-07-26 2019-07-01 Pompe avec détection d'angle de rotation absolu Active EP3768974B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018118100.0A DE102018118100A1 (de) 2018-07-26 2018-07-26 Pumpe mit absoluter Drehwinkel-Erfassung
PCT/EP2019/067542 WO2020020577A1 (fr) 2018-07-26 2019-07-01 Pompe avec détection d'angle de rotation absolu

Publications (2)

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

Family

ID=65981341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19735541.5A Active EP3768974B1 (fr) 2018-07-26 2019-07-01 Pompe avec détection d'angle de rotation absolu

Country Status (5)

Country Link
US (1) US11644032B2 (fr)
EP (1) EP3768974B1 (fr)
CN (1) CN208718917U (fr)
DE (1) DE102018118100A1 (fr)
WO (1) WO2020020577A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021104816A1 (de) 2021-03-01 2022-09-01 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Betreiben einer Peristaltikpumpe, Peristaltikpumpe, Kraftfahrzeug sowie Verwendung einer Peristaltikpumpe

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Also Published As

Publication number Publication date
EP3768974B1 (fr) 2023-08-30
US11644032B2 (en) 2023-05-09
CN208718917U (zh) 2019-04-09
US20210262466A1 (en) 2021-08-26
DE102018118100A1 (de) 2020-01-30
WO2020020577A1 (fr) 2020-01-30

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