EP1739307A2 - Pompe à cavité progressive - Google Patents

Pompe à cavité progressive Download PDF

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Publication number
EP1739307A2
EP1739307A2 EP20060009904 EP06009904A EP1739307A2 EP 1739307 A2 EP1739307 A2 EP 1739307A2 EP 20060009904 EP20060009904 EP 20060009904 EP 06009904 A EP06009904 A EP 06009904A EP 1739307 A2 EP1739307 A2 EP 1739307A2
Authority
EP
European Patent Office
Prior art keywords
stator
sensor
eccentric screw
rotor
screw pump
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.)
Withdrawn
Application number
EP20060009904
Other languages
German (de)
English (en)
Inventor
Reinhold Eikenkamp
Michael Hams
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 EP1739307A2 publication Critical patent/EP1739307A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/02—Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]

Definitions

  • the invention relates to an eccentric screw pump with a (eccentric screw) stator and a rotatably driven and helically wound (eccentric screw) rotor mounted in the stator, the stator being made at least partially from an elastic material, e.g. an elastomer.
  • the rotor is regularly connected to the drive or the drive shaft via at least one coupling rod, which is also referred to as a cardan shaft.
  • the pump housing regularly has a filling opening or a filling funnel.
  • elastomer means in particular a (synthetic) rubber or a rubber mixture.
  • composites of an elastomer and another material includes.
  • the rubber or rubbers may be e.g. to be an R rubber, e.g. a nitrile butadiene rubber (NBR). Further, it may be an M rubber, e.g. Ethylene-propylene-diene rubber (EPDM) or propylene-tetra-fluoro-ethylene rubber (FPM) act.
  • EPDM Ethylene-propylene-diene rubber
  • FPM propylene-tetra-fluoro-ethylene rubber
  • Q rubbers and consequently silicone rubbers come into question.
  • the stator or the elastic material are usually surrounded by a stator jacket or integrated in a stator jacket, which z. B. is made of metal.
  • eccentric screw pumps of the type described above are known in different embodiments.
  • the elastomeric stators are subject to wear in the course of operation, so that maintenance work or a pump replacement are required at regular intervals.
  • an indirect determination of the state of wear takes place.
  • a particular disadvantage is that measurements or measurement signals of the respective plant operator must be accessed. - This is where the invention starts.
  • the invention has for its object to provide an eccentric screw pump of the type described above, which allows a simple and functional way a reliable monitoring of the functionality and in particular the wear of the stator.
  • the invention teaches in a generic eccentric screw pump, that the stator is associated with at least one sensor with which compressions (or expansions) and / or movements of the stator or the elastic material in the course of the rotation of the rotor can be measured. Movements of the stator or elastic material means in particular movements of stator areas, which are caused by compression or expansion.
  • the sensor may be z. B. to act as a pressure transducer or force transducer, which generates a dependent on the pressure or the force output of compressions of the stator.
  • the sensor can also be designed as a displacement transducer which, when the stator is compressed and associated movements of stator regions, produces an output signal which is dependent on a change in the path (eg thickness change).
  • the sensors can be designed, for example, as strain gauges (strain gauges), as inductive sensors, as capacitive sensors, as optical sensors and / or as piezoelectric sensors.
  • strain gauges strain gauges
  • electronic circuits such as a bridge circuit
  • the Sensor an output signal, such as a voltage generated, which depends on a predetermined characteristic of the pressure or path to be determined.
  • the sensor can be at least partially integrated into the elastic material of the stator.
  • the invention proposes that the sensor is connected to a measuring and / or evaluation unit which registers the measuring signal as a function of time. This measuring and / or evaluation unit can be integrated in the sensor or the pump or in a corresponding pump control.
  • the measuring and / or evaluation unit is formed by a separate computer. It is particularly advantageous if, with the measuring and / or evaluation unit for determining the state of wear of the stator, the determined (time-dependent) measuring signal is compared with stored reference signals.
  • the invention is based on the recognition that a monitoring of the state of wear of the stator of an eccentric screw pump is possible in a particularly simple and reliable manner, when a compression registering measuring sensor is integrated into the elastic stator.
  • the invention has recognized that the back pressure generated by the elastomeric stator during the rotation of the rotor depends on the state of wear of the stator. Because with increasing material removal in the region of the stator and the pressure transmitted by the rotor in the course of the rotation on the elastomeric stator or the compression decreases. Is now at a certain time z. B.
  • the measurement signal registered as a function of time is a periodic signal. While the period or frequency of this signal usually does not change with increasing rotor frequency with increasing wear, the amplitude of the periodic signal decreases with increasing wear, since the pressure acting on the pressure sensor or the path registered by the transducer decreases accordingly.
  • Particularly advantageous is the fact that the determination of the measurement signal and possibly a comparison with a previously performed and stored reference measurement are completely sufficient to gain reliable information about the state of wear of the stator. It is not necessary to use "external" measured values or data of the system operator, such as the flow rate or the like.
  • the output signal of the measuring sensor changes periodically with the periodic movement of the rotor, so that the measuring sensor according to the invention at the same time allows monitoring of the operating time and also the operating speed or speed. In this context, otherwise customary sensors in the field of the drive can therefore be dispensed with.
  • the measuring and evaluation unit is connected to a data transmission unit or such a data transmission unit is integrated into the measuring and / or evaluation unit, wherein the data transmission unit transmits the determined pressure signals and / or the respective results of the evaluation to a monitoring unit become.
  • the data transmission unit can be connected, for example, to a local network in a building. But there is also the possibility that the data transmission unit, the corresponding Transmits measured values via, for example, telecommunication lines or the like in the sense of remote data transmission.
  • the elastomeric material of the stator is surrounded in a manner known per se at least in regions by a (rigid) stator jacket (for example made of metal).
  • a stator jacket for example made of metal.
  • the invention proposes that the measuring sensor, z. B. pressure sensor can be supported directly or indirectly on the stator shell as an abutment. The sensor is thus attached to the stator shell or fixed relative to the stator shell in this embodiment, so that it is ensured that pressure changes in the elastomeric stator material are also completely transferred to the pressure transducer, i. The pressure transducer can not escape during the compression of the stator.
  • the pressure transducer is substantially completely integrated into the stator and (only) the connecting leads and / or a connection socket of the pressure transducer are led out of the stator.
  • the pressure transducer is cast in the course of production with the elastomer or is formed in the elastomeric stator.
  • a sensor for. B. trained as a strain gauge pressure sensor is fully integrated into the elastic stator shell, without being supported on the stator shell.
  • At least one moving element for. B. a bolt, pin or connected, wherein movements of this moving element is detected in the course of the rotation of the rotor with the sensor.
  • a measuring pin may be fixedly connected to the elastomer and led out through the stator jacket (eg an opening) so that the measuring pin can move relative to the stator jacket in the course of the movement of the stator.
  • the associated path changes of this pin can then with a corresponding sensor, eg. B. registered an optical sensor.
  • the sensor generates a periodic output signal in the course of the rotation of the rotor, which can be correspondingly registered and evaluated.
  • the senor is arranged in a region with a minimum inner width of the stator. This applies both to stators with variable or non-uniform wall thickness and with uniform wall thickness over the stator length.
  • stators with variable wall thickness of the elastomeric stator outside is regularly cylindrically shaped and provided on the inside with an internal screw or a screw flight with variable inner width. This results in the different areas of the elastomeric stator areas with different thickness or wall thickness, with areas of maximum wall thickness occur where the inner width is minimal.
  • the one or more pressure sensors are preferably arranged in such areas of maximum wall thickness.
  • the pressure transducer can be optimally integrated into the elastomeric material and at the same time sufficient elastomeric material for generating the corresponding counter-pressure is present.
  • the largest back pressure is generated by the rotor in this area. This applies in the case of stators with uniform wall thickness in a corresponding manner, because even there is generated in the areas with minimal internal width of the maximum back pressure from the rotor. In principle, however, it is also possible to arrange the sensor (s) in other areas of the stator.
  • FIG. 1 shows an eccentric screw pump 1 with an eccentric screw stator and an eccentric screw rotor 3 mounted in the eccentric screw stator 2.
  • the rotor 3 is helically wound and driven by a drive 4 rotating.
  • the drive 4 is connected in the embodiment via a coupling rod 5 to the rotor 3.
  • the pump housing 6 is equipped in the region of the coupling rod 5 with a filling opening 7.
  • the working direction of the pump is indicated by an arrow R by way of example.
  • the stator 2 of the eccentric screw pump 1 is made of an elastomeric material. This may be, for example, NBR, EPDM, FPM, CSM or even a silicone rubber.
  • the stator 2 is assigned a measuring sensor 8 with which compressions of the stator 2 are measured in the course of the rotation of the rotor 3.
  • This sensor 8 is designed as a pressure transducer.
  • the pressure transducer 8 is designed as a strain gauge transducer (strain gauges) with appropriate bridge circuit. This pressure transducer 8 generates a pressure dependent on the pressure acting on the transducer output signal in the form of an electrical voltage. It can be seen that the pressure transducer 8 is partially integrated into the elastomer. Incidentally, it is possible to position a plurality of pressure transducers at different positions of the stator.
  • Fig. 1 indicates that the pressure transducer 8 is connected to a measuring and / or evaluation unit 9, which registers the pressure signal (or the corresponding voltage signal) as a function of time and optionally stores.
  • This measurement and / or evaluation unit 9 can be designed as a separate unit, e.g. be designed as a computer or be integrated into a corresponding pump control.
  • the elastomeric material of the stator 2 in the region of the pressure transducer 8 is now more or less compressed during the rotation of the rotor 3, so that the pressure transducer 8 generates a periodic pressure signal whose period of the rotational speed of the rotor. 3 and its amplitude from the generated back pressure of the elastomer depends.
  • a reference measurement is now carried out at a specific reference time, for example when the pump is delivered, it is possible at a later time to record a likewise periodic pressure signal with the measuring and / or evaluation unit 9 for determining the state of wear of the stator 2 and to compare with the stored reference signal. If such a comparison yields, for example, that the amplitude of the measurement signal deviates from the amplitude of the reference signal, it is thus possible to draw conclusions about the state of wear of the pump.
  • the determination of the signals or the evaluation and analysis can be made directly on site on the eccentric screw pump 1 or on the control unit or the corresponding computer.
  • the measuring and evaluation unit 9 is connected to a data transmission device 10, with which the detected measurement signals and / or the results of the evaluation and optionally a warning signal to a (External) monitoring unit 11 are transmitted.
  • the transmission can take place via local and / or global networks in the sense of remote data transmission, e.g. via appropriate telecommunications networks, so that there is the possibility of remote monitoring.
  • the elastomeric material of the stator 2 is at least partially surrounded by a (rigid) stator jacket 12, which may be made of metal, for example.
  • the pressure transducer 8 is fixed in this embodiment of this stator shell 12 so that it is supported on the stator shell 12 and this stator shell 12 thus forms an abutment, which ensures that the counter pressure generated by the elastomer completely on the pressure sensor 8 and its active Surface acts.
  • FIG. 2 shows an embodiment of a stator with variable or non-uniform wall thickness over the stator length.
  • the worm gear of the stator has a variable over the stator length inner width.
  • the pressure sensor 8 is arranged in a region of the stator 2 with a minimum inner width W. This area of minimum inner width W corresponds to a region with maximum wall thickness.
  • the maximum wall thickness is characterized by W max , while the minimum wall thickness is marked W min .
  • the structure of the stator essentially corresponds to the structure according to FIG. 2.
  • the measuring sensor 8 is designed as a displacement transducer.
  • this displacement sensor 8 is associated with a connected to the elastomeric stator material movement element 13, which is formed in the embodiment as a pin or pin and partially integrated in the elastomer.
  • This pin 13 is passed through a recess 14 through the stator casing 12.
  • an optical sensor end sensor 8 is zugeorndet.
  • the transducer 8 is arranged completely outside the stator shell 12.
  • the pin 13 In the course of the rotation of the rotor 3 and the associated compressions of the stator 2, the pin 13 periodically changes its position relative to the stator jacket 12, wherein these position changes or path changes are registered with the optical sensor 8.
  • the time-dependent measurement signal can then be registered and evaluated as already explained with reference to FIGS. 1 and 2.
  • FIGS. 1 to 3 show embodiments in which the stator has a variable or non-uniform wall thickness over the stator length
  • FIG. 4 shows a modified embodiment with a stator uniform wall thickness.
  • the sensor shown in Fig. 4 is here - as in the embodiment of FIG. 2 - designed as a pressure transducer 8. It can be seen that this pressure sensor 8 is arranged in the region of minimum inner width W.
  • Fig. 5 - shows an embodiment of a stator with uniform wall thickness.
  • the sensor is designed in this embodiment as a displacement transducer 8 or as an optical sensor, as already described for Fig. 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP20060009904 2005-06-07 2006-05-13 Pompe à cavité progressive Withdrawn EP1739307A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200520008989 DE202005008989U1 (de) 2005-06-07 2005-06-07 Exzenterschneckenpumpe

Publications (1)

Publication Number Publication Date
EP1739307A2 true EP1739307A2 (fr) 2007-01-03

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Family Applications (1)

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EP20060009904 Withdrawn EP1739307A2 (fr) 2005-06-07 2006-05-13 Pompe à cavité progressive

Country Status (2)

Country Link
EP (1) EP1739307A2 (fr)
DE (1) DE202005008989U1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009088827A2 (fr) * 2007-12-31 2009-07-16 Schlumberger Canada Limited Appareil à rotor hélicoïdal excentré comprenant un transducteur, procédés de fabrication et d'utilisation
RU2493369C2 (ru) * 2007-04-27 2013-09-20 Шлюмберже Текнолоджи Б.В. Способ формования ротора электровинтовой установки и ротор электровинтовой установки (варианты)
JP2016079971A (ja) * 2014-10-17 2016-05-16 兵神装備株式会社 容積式ポンプ
CN108422441A (zh) * 2018-05-21 2018-08-21 南京航空航天大学 一种基于压电螺杆泵的水下机械臂及其控制方法
CN110392785A (zh) * 2017-01-16 2019-10-29 福格申有限责任两合公司 偏心蜗杆泵中间隙几何形状的调节
WO2021126909A1 (fr) * 2019-12-16 2021-06-24 Saudi Arabian Oil Company Stator de moteur de forage intelligent

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100465429C (zh) * 2006-12-20 2009-03-04 陈志林 智能电子燃油泵
DE202009002823U1 (de) 2009-03-02 2009-07-30 Daunheimer, Ralf Exzenterschneckenpumpe
DE102015112248A1 (de) * 2015-01-29 2016-08-04 Netzsch Pumpen & Systeme Gmbh Exzenterschneckenpumpe und Verfahren zum Anpassen des Betriebszustands einer Exzenterschneckenpumpe
DE102018113347A1 (de) 2018-06-05 2019-12-05 Seepex Gmbh Verfahren zur Bestimmung oder Überwachung des Zustandes einer Exzenterschneckenpumpe
DE102019130981A1 (de) 2019-11-15 2021-05-20 Seepex Gmbh Exzenterschneckenpumpe
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
DE102022132634A1 (de) 2022-12-08 2024-06-13 Seepex Gmbh Pumpe und Verfahren zur Überwachung einer Pumpe

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2493369C2 (ru) * 2007-04-27 2013-09-20 Шлюмберже Текнолоджи Б.В. Способ формования ротора электровинтовой установки и ротор электровинтовой установки (варианты)
WO2009088827A2 (fr) * 2007-12-31 2009-07-16 Schlumberger Canada Limited Appareil à rotor hélicoïdal excentré comprenant un transducteur, procédés de fabrication et d'utilisation
WO2009088827A3 (fr) * 2007-12-31 2010-06-10 Schlumberger Canada Limited Appareil à rotor hélicoïdal excentré comprenant un transducteur, procédés de fabrication et d'utilisation
CN101965458A (zh) * 2007-12-31 2011-02-02 普拉德研究及开发股份有限公司 具有变换器的螺杆设备及其形成和使用方法
RU2451838C2 (ru) * 2007-12-31 2012-05-27 Шлюмбергер Текнолоджи Б.В. Статор и способ его формирования
CN101965458B (zh) * 2007-12-31 2015-09-16 普拉德研究及开发股份有限公司 具有变换器的螺杆设备及其形成和使用方法
JP2016079971A (ja) * 2014-10-17 2016-05-16 兵神装備株式会社 容積式ポンプ
CN110392785A (zh) * 2017-01-16 2019-10-29 福格申有限责任两合公司 偏心蜗杆泵中间隙几何形状的调节
CN110392785B (zh) * 2017-01-16 2021-03-30 福格申有限责任两合公司 偏心螺杆泵中间隙几何形状的调节
US11286928B2 (en) 2017-01-16 2022-03-29 Vogelsang Gmbh & Co. Kg Controlling the gap geometry in an eccentric screw pump
CN108422441A (zh) * 2018-05-21 2018-08-21 南京航空航天大学 一种基于压电螺杆泵的水下机械臂及其控制方法
CN108422441B (zh) * 2018-05-21 2023-05-09 南京航空航天大学 一种基于压电螺杆泵的水下机械臂及其控制方法
WO2021126909A1 (fr) * 2019-12-16 2021-06-24 Saudi Arabian Oil Company Stator de moteur de forage intelligent
US11371503B2 (en) 2019-12-16 2022-06-28 Saudi Arabian Oil Company Smart drilling motor stator

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Publication number Publication date
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