EP3803122A1 - Procédé pour déterminer ou surveiller l'état d'une pompe à vis excentrique - Google Patents

Procédé pour déterminer ou surveiller l'état d'une pompe à vis excentrique

Info

Publication number
EP3803122A1
EP3803122A1 EP19728623.0A EP19728623A EP3803122A1 EP 3803122 A1 EP3803122 A1 EP 3803122A1 EP 19728623 A EP19728623 A EP 19728623A EP 3803122 A1 EP3803122 A1 EP 3803122A1
Authority
EP
European Patent Office
Prior art keywords
pump
pressure
state
stator
pulsation
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.)
Pending
Application number
EP19728623.0A
Other languages
German (de)
English (en)
Inventor
Johannes Schulz
Sascha Plazar
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.)
Seepex GmbH
Original Assignee
Seepex GmbH
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 Seepex GmbH filed Critical Seepex GmbH
Publication of EP3803122A1 publication Critical patent/EP3803122A1/fr
Pending legal-status Critical Current

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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/16—Wear
    • 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
    • F04C2270/80—Diagnostics
    • 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
    • F04C2270/86—Detection

Definitions

  • the invention relates to a method for determining or monitoring the state (eg operating state, wear state or fault state) of an eccentric screw pump which has a stator made of an elastic material and a rotor rotating at a pump frequency in the stator.
  • the rotor z. B. via at least one coupling rod, which is also referred to as a propeller shaft, connected to a drive.
  • the pump has a z. B. suction side connected to the stator pump housing, z. B. suction on which is usually a housing opening, for. B. has an inlet opening, for the medium to be delivered.
  • the pump has a to the stator z. B. pressure side connected pump housing, z. B.
  • Such a progressing cavity pump is a pump from the group of rotary displacement pumps, which are used to promote a variety of media and in particular high-viscosity liquids in different industries.
  • the media to be delivered can be z. B. also contain solids.
  • the stator consists z. B. of an elastic, preferably elastomeric material and is usually surrounded by a one-piece or multi-part stator shell or stator housing.
  • the pump housing connected on the suction side to the stator is generally referred to as a suction housing, and the housing connected to the stator on the pressure side as a discharge nozzle. In principle, however, it is also possible to operate such a pump in the opposite direction of conveyance. The rotating and at the same time the eccentricity ensuring connection between the drive or the connecting shaft on the one hand and the rotor on the other hand via
  • the coupling rod arranged in the pump housing.
  • the coupling rod can be z. B. be connected via a rotor-side joint with the rotor and a drive-side joint with the drive shaft or connecting shaft.
  • embodiments with a flexible coupling rod without joints are also covered by the scope of protection.
  • Such progressing cavity pumps are z. B. from DE 10 2014 112 552 A1, DE 10 2010 037 440 A1 and WO 2009/024279 A1.
  • the eccentric screw pumps or their components are subject to wear during operation, so that maintenance work or maintenance measures are required at regular intervals.
  • Typical wear parts are in particular the elastic stator, but also the rotor rotating in the elastic stator. It is therefore known to monitor the wear of these components during operation by determining suitable parameters. So there is z. Example, the ability to register the flow or the flow rate and to compare these values with the respective speeds of the rotor. Similarly, the back pressure of the pump compared to the speed can be determined. With the methods known so far, an indirect determination of the state of wear thus takes place.
  • an eccentric screw pump in which the stator is associated with a sensor, are measured with the compressions and / or movements of the stator or the elastic material in the course of the rotation of the rotor.
  • the sensor may be z.
  • the determined time-dependent measurement signal is compared with stored reference signals. It is exploited that with increasing material removal in the region of the stator and the transmitted from the rotor during the rotation of the elastomeric stator pressure or compression decreases. If a pressure signal is detected and registered at a certain point in time and it is determined that the pressure signal is substantially lower than the previously stored reference signals, then this is a reliable indication of a corresponding wear of the stator. Due to the periodic operation of the rotor, the measurement signal registered as a function of time is a periodic signal.
  • the invention is based on the technical problem of providing a method with which the state of an eccentric screw pump, for. As a state of wear, operating state or fault condition can be reliably determined.
  • the invention teaches a method for determining or monitoring the state of an eccentric screw pump, which has a stator and a rotor rotating at a pump frequency in the stator,
  • the time course of an operating parameter of the pump is provided which periodically pulsates with the pump frequency or a multiple of the pump frequency and whose pulsation amplitude depends on the state of the eccentric screw, wherein (from the time profile of the operating parameter) the pulsation amplitude is determined and by comparing the Pulsation amplitude with one or more comparative values of the state of
  • Comparative values can be z. B. determined in advance and stored in a memory. However, it is also possible to determine the comparison values during operation and to store them in the memory. Thus, comparison values may be determined dynamically based on a plurality of values taken during (normal) operation, e.g. B. by means of statistical or neural processes in the sense of machine learning. Thus, also learned comparative values or a (parameterized) algorithm, which is used to determine a comparison value, come into consideration. Such
  • Comparative values or algorithms can, for. B. be learned during operation of the pump. They are z. B. stored in a volatile memory (register, RAM).
  • the operating pressure of the eccentric screw pump is made available as an operating parameter, and the pulsation amplitude of the pressure pulsation is determined.
  • the operating pressure of the eccentric screw pump does not vary with the rotation or rotational frequency of the pump, ie a perfect eccentric screw pump is free from pressure pulsations in relation to the operating pressure.
  • eccentric screw pumps are indeed comparatively low in pulsation, yet they have certain pressure pulsations that respond to the changing sealing lines during
  • the invention has recognized that the pulsation amplitude of the pressure pulsation depends very significantly on the wear of the relevant components of an eccentric screw pump, in particular stator and / or rotor. This is due to the fact that with increasing wear of the rotor and / or stator, the sealing line and the delivery chamber changes and this can be clearly seen in the temporal pressure curve and exploit for a determination of wear or wear monitoring.
  • the constant or decreasing or increasing pressure during operation of an eccentric screw pump on a time scale in the seconds or minutes range is therefore in practice superimposed on a periodically varying pressure pulsation and the pulsation amplitude of this pressure pulsation increases with increasing wear of the stator and / or the rotor.
  • determining the Pulsationsamplitude at a certain time or monitoring the Pulsationsamplitude over a period of time and a comparison with previously stored comparison values can be in a simple way the state of wear of the eccentric screw, z. B. of the stator and / or rotor determine / monitor.
  • the determination or monitoring of the state of a pump but also refer to a fault condition of the pump, z. B. on a dry run or overpressure of the pump.
  • the pulsation amplitude and consequently the amplitude of the pressure pulsation can be determined directly and thus on the state, for. B. state of wear can be closed. In a preferred embodiment, however, the pulsation amplitude is not determined directly from the temporal pressure curve, but the time profile of the periodically pulsating operating parameter, z. B. the temporal pressure curve, is first in one
  • the amplitude development of the pressure pulsation in the first harmonic of the pump frequency is even greater than in the pump frequency itself, so that preferably not from the frequency spectrum for the evaluation of the amplitude of the pump frequency, but a harmonic of the pump frequency, z. B. the first or second harmonic is used.
  • the figure description reference is made to the figure description.
  • the operating pressure of the pump or the pressure pulsations directly by a pressure measurement, for. B. to determine with a pressure gauge Preferably, the determination of the operating pressure on the pressure side of the stator, z. B. in or on a pressure side connected to the stator discharge port or in or on a pressure side connected to the stator line.
  • the operating pressure can be used as operating parameters z.
  • B. also provided the torque or the motor current of the pump drive available or used.
  • the pulsation amplitude of the torque pulsation or motor current pulsation is determined. So z.
  • the wear on the stator and / or rotor in a Exzenterschenkenpumpe typically not only to pressure pulsations, but also to pulsation-like changes in the torque of the pump, which is why the torque pulsation can be used as operating parameters.
  • the determination or monitoring of a state of wear of the pump for. B. rotor and / or stator in the foreground.
  • a specific operating state or fault state can be determined or monitored, for.
  • overpressure, insufficient or excessive clamping of a braced stator changes in the rotor / stator geometry, z.
  • the sealing line, or swelling of the stator in media incompatibility As a dry run, overpressure, insufficient or excessive clamping of a braced stator, changes in the rotor / stator geometry, z.
  • the invention also includes the analysis of the time course of other operating parameters of a pump which pulse periodically with the pump frequency and the pulsation amplitude of which depends on the state of the eccentric screw pump.
  • Such an operating parameter may be provided by measurement in the manner described, i. H. be measured.
  • a transformation of the time profile into a frequency spectrum takes place in the manner already described.
  • the method according to the invention also has the advantage that the occurrence of the frequencies which are of interest for wear as multiples of the pump frequency, which is known or can easily be determined, is a simple one
  • the invention also relates to a monitoring device for an eccentric screw pump or an eccentric screw pump with such a monitoring device for carrying out the described method.
  • a monitoring device thus comprises means, e.g. For example, an electronic evaluation unit, a computer or the like, which are suitable (and set to program technology) to perform the described method for determining and monitoring the state of the eccentric screw pump.
  • a monitoring device can, for. Example, have a sensor for measuring the operating parameter or be connected to such a sensor.
  • a sensor it may be z. B. to act a pressure sensor for detecting and continuously recording the operating pressure of the eccentric screw pump.
  • the monitoring device may have an optical and / or an acoustic display, with which the determined state of the eccentric screw pump is displayed.
  • the monitoring device with optical or acoustic display can in principle be integrated directly into the eccentric screw pump, so that the state of wear or an operating or fault state can be displayed directly on the eccentric screw pump.
  • a separate monitoring device is provided which only has to access the operating parameters of the eccentric screw pump.
  • the monitoring device can also be a computer or computer that is set up to carry out the described method and consequently to determine or monitor the state of the eccentric screw pump.
  • the inventive method can, for. B. as a computer program or computer program product for
  • Such a computer program z. B. on a standard computer, tablet or smartphone and install the necessary for the implementation of the method operating parameters or the time profile of the operating parameters can be wired or wirelessly transmitted to the device and with the help of the computer program can be from the transmitted operating parameters or operating data determine the state of wear.
  • the invention not only detects the determination of the state of wear of the eccentric screw pump, but alternatively also the determination and monitoring of an operating or fault condition, for. B. a dry run of the eccentric screw pump. Because the pulsation amplitude of the operating parameter, z. B. the pressure pulsations, changes even with a dry run of the pump over a normal operation, so that according to the invention also a dry run protection for an eccentric screw pump can be realized.
  • the determination or monitoring of other operating conditions eg. As interference conditions into consideration, in particular the monitoring of changes in geometry of the rotor and / or stator.
  • the monitoring device preferably has a memory in which the comparison values for the pulsation amplitudes required for the evaluation are stored, so that the determined pulsation amplitudes are compared with the stored pulsation amplitudes for determining a state of wear or operating state of the pump.
  • the aforementioned dynamic determination and storage of comparison values can also be used with the monitoring device
  • the monitoring device preferably has an electronic evaluation device which is set up to use the signals made available, for B. signals from a measuring device, with the required frequency resolution to capture and exploit.
  • the sensor must also be able to detect the operating parameter with regard to the time resolution with the pump frequency.
  • the eccentric screw pump in dependence on the determined state, for. B. wear condition, to operate and consequently adapt the operation of the eccentric screw pump to the information determined. This is z. B. the ability to realize the invention in an eccentric screw pump with automated delivery, the z. B. in DE 10 2014 112 552 A1 is described.
  • timing of the onset of wear determined by the system serves as the starting point for a wear history prediction based on other metrics.
  • a conventional eccentric screw pump which has a stator 1 made of an elastic material and a rotor 2 rotating in the stator 1, wherein the stator 1 is surrounded by a stator shell 3. Furthermore, the pump has a suction housing 4 and a connecting piece 5, which is also referred to as a discharge nozzle 5.
  • the pump also has a pump drive 6 which operates on the rotor 2 via a coupling rod 7.
  • the coupling rod 7 is connected via a drive-side coupling joint 8 to the drive 6 and a drive shaft and a rotor-side coupling joint 9 to the rotor 2.
  • a pressure sensor 11 is provided in the region of the pressure port 5, with which the operating pressure of the eccentric screw pump is measured.
  • the eccentric screw pump or the sensor 11 is connected to a monitoring device 10, with which the state of wear of the eccentric screw pump can be determined or monitored. This monitoring device 10 operates on the
  • FIGS. 3a to 3c show the amplitude development A of the pressure pulsations in a frequency range, the functions according to FIGS. 3a to 3c respectively resulting from the functions according to FIGS. 2a to 2c by Fourier transformation.
  • the pump was operated at a pump frequency of 100 revolutions per minute and consequently a pump frequency of 1.7 Flz.
  • FIGS. 3a to 3c show the pulsation amplitudes for the pump frequency at approximately 1.7 Hz and the first harmonic at approximately 3.3 Hz and the second harmonic at approximately 5 Hz and the third harmonic at approximately 6.7 Hz. It becomes clear that the pressure pulsations can be analyzed very significantly on the basis of the first harmonic of the frequency spectrum.
  • FIG. 4 The amplitude development of the pressure pulsations, which is shown in FIGS. 3a to 3c for only three values, is plotted in FIG. 4 as a function of the operating time, wherein in a test by a suitable medium a particularly high degree of wear over a certain operating time has been produced. It can be seen that the pulsation amplitude for both the pump frequency and for the first three harmonic increases with increasing operating time, so that in this way determination and monitoring of the wear of the eccentric screw pump is possible, in particular by comparing the determined values with previously recorded comparison values ,
  • the monitoring device which is merely indicated in FIG. 1 and which detects the sensor data and evaluates it with evaluation electronics capable of "high-frequency" the sensor signals is used for this purpose. H. in a kHz range.
  • the frequency spectra are then generated from the determined data and, by comparison with previously stored / determined data, the state of wear or also an interference state is determined.

Landscapes

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

Abstract

L'invention concerne un procédé de détermination ou de surveillance de l'état d'une pompe à vis excentrique qui présente un stator et un rotor tournant à une fréquence de pompe dans le stator, le trajet dans le temps d'un paramètre de fonctionnement de la pompe étant mis à disposition, lequel pulse périodiquement avec la fréquence de pompe ou un multiple de la fréquence de pompe et dont l'amplitude de pulsation dépend de l'état de la pompe à vis excentrique, l'amplitude de pulsation étant déterminée et l'état de la pompe à vis excentrique étant déterminé par comparaison de l'amplitude de pulsation avec une ou plusieurs grandeurs de comparaison.
EP19728623.0A 2018-06-05 2019-05-29 Procédé pour déterminer ou surveiller l'état d'une pompe à vis excentrique Pending EP3803122A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018113347.2A DE102018113347A1 (de) 2018-06-05 2018-06-05 Verfahren zur Bestimmung oder Überwachung des Zustandes einer Exzenterschneckenpumpe
PCT/EP2019/063983 WO2019233859A1 (fr) 2018-06-05 2019-05-29 Procédé pour déterminer ou surveiller l'état d'une pompe à vis excentrique

Publications (1)

Publication Number Publication Date
EP3803122A1 true EP3803122A1 (fr) 2021-04-14

Family

ID=66770448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19728623.0A Pending EP3803122A1 (fr) 2018-06-05 2019-05-29 Procédé pour déterminer ou surveiller l'état d'une pompe à vis excentrique

Country Status (3)

Country Link
EP (1) EP3803122A1 (fr)
DE (1) DE102018113347A1 (fr)
WO (1) WO2019233859A1 (fr)

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DE102020111386A1 (de) 2020-04-27 2021-10-28 Vogelsang Gmbh & Co. Kg Zustandserfassung an Exzenterschneckenpumpen
DE102020112660A1 (de) 2020-05-11 2021-11-11 MOOG Gesellschaft mit beschränkter Haftung Verfahren zum Bestimmen eines momentanen Verschleißzustandes einer hydrostatischen Maschine
DE102021103615A1 (de) 2021-02-16 2022-08-18 Vieweg GmbH Dosier- und Mischtechnik Exzenterschnecken-Dosiervorrichtung und Verfahren zur Steuerung einer Exzenterschnecken-Dosiervorrichtung
DE102021112422A1 (de) 2021-05-12 2022-11-17 Seepex Gmbh Pumpe zum Fördern eines Mediums und Verfahren zur Überwachung
DE102021112419A1 (de) 2021-05-12 2022-11-17 Ruhr-Universität Bochum, Körperschaft des öffentlichen Rechts Pumpe zum Fördern eines Mediums und Verfahren zur Überwachung
DE102021121572A1 (de) 2021-08-19 2023-02-23 Hilger U. Kern Gmbh Verfahren zur Bestimmung des Verschleisszustands einer Exzenterschneckenpumpe sowie Exzenterschneckenpumpe zur Durchführung des Verfahrens
DE102021132549A1 (de) 2021-12-09 2023-06-15 Seepex Gmbh Gelenkverbindung, rotierende Einheit und Exzenterschneckenpumpe
DE102021132561A1 (de) 2021-12-09 2023-06-15 Seepex Gmbh Gelenkverbindung, rotierende Einheit und Exzenterschneckenpumpe
CN114279316A (zh) * 2021-12-28 2022-04-05 华中科技大学 一种基于阻尼识别检测丝杠偏心程度的方法
DE102022119147A1 (de) 2022-07-29 2024-02-01 Ruhr-Universität Bochum, Körperschaft des öffentlichen Rechts Verfahren zur Bestimmung oder Überwachung des Förderstroms einer Exzenterschneckenpumpe
DE102022134734A1 (de) 2022-12-23 2024-07-04 Ruhr-Universität Bochum, Körperschaft des öffentlichen Rechts Verfahren zur Steuerung einer Exzenterschneckenpumpe

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Also Published As

Publication number Publication date
WO2019233859A1 (fr) 2019-12-12
DE102018113347A1 (de) 2019-12-05

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