EP1196693A1 - Method and device for operating a screw pump - Google Patents

Method and device for operating a screw pump

Info

Publication number
EP1196693A1
EP1196693A1 EP01943088A EP01943088A EP1196693A1 EP 1196693 A1 EP1196693 A1 EP 1196693A1 EP 01943088 A EP01943088 A EP 01943088A EP 01943088 A EP01943088 A EP 01943088A EP 1196693 A1 EP1196693 A1 EP 1196693A1
Authority
EP
European Patent Office
Prior art keywords
temperature
pump
values
area
operating
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Withdrawn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
EP01943088A
Other languages
German (de)
French (fr)
Inventor
Wolfgang Rudert
Guido Gutmann
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.)
Netzsch Pumpen and Systeme GmbH
Original Assignee
Netzsch Pumpen and Systeme 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
Priority claimed from DE10063953A external-priority patent/DE10063953A1/en
Application filed by Netzsch Pumpen and Systeme GmbH filed Critical Netzsch Pumpen and Systeme GmbH
Publication of EP1196693A1 publication Critical patent/EP1196693A1/en
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F04C2270/12—Vibration
    • 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
    • F04C2270/19—Temperature
    • 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 and a device for operating a screw pump.
  • the invention has for its object to provide a method and a device, whereby the pump, in particular the rotor, the stator, the one or more joints and the bearing during operation can be monitored for their condition.
  • the invention is based on the fact that when using screw pumps it would be possible to achieve an optimization of the pump operating mode by constantly monitoring individual operating parameters relating to the medium temperatures, bearings, the joints, the stator and the rotor. It can react immediately to changing operating temperatures and back pressures that cannot be controlled. The routine replacement of wearing parts such as the rotor and stator is no longer necessary once the actual need can be met.
  • This type of external monitoring affects in particular the use of the pumps in the offshore and onshore areas, as well as in areas with complex accessibility of the pumps for maintenance purposes.
  • the temperature and / or the vibrations occurring are measured in the area of the bearing.
  • the actual values measured in the process are compared with predetermined target values. From the resulting differences in measured values, conclusions can be drawn about the state of the bearing or the current mode of operation of the pump.
  • the temperature in the bearing area can also be used to draw conclusions about the state of wear of the joint.
  • condition of the joint (s) is monitored by scanning the temperature and / or vibrations occurring in the area of the joints and / or bearing, with the occurrence of changes in the temperature and / or vibration values resulting from the Comparison of the measured actual values with specified target values, status reports are carried out automatically and / or control measures are initiated.
  • the state of the rotor and / or the stator is determined by scanning the temperature and / or the temperature of the medium occurring in the rotor-stator region and / or by expanding the pressures and / or occurring in the inlet or outlet region of the pump. or monitored by wear measurement on the rotor. Changes that result from this current measurement in comparison with specified target values automatically lead to status messages and / or control measures.
  • the measured temperature and / or vibration and / or pressure and / or wall thickness and / or wear values are fed to data processing and from there by remote transmission to the pump operator and / or the pump manufacturer for maintenance purposes and / or for Operating settings' Oge'n fed.
  • the screw pump is provided with at least one temperature sensor in the area of the bearing and / or with at least one temperature sensor in the area of the joints or the joint and / or in the pump inlet or pump outlet area with pressure transducers , Vibration sensors can be attached in the area of the bearing and in the joint area. All signals sent by the temperature sensors, the pressure transducers, vibration sensors and the wear indicators are, for example, fed to a data processing unit which transmits them to the pump operator and / or the pump manufacturer and / or a service company for monitoring purposes.
  • Corresponding software programs can be used to correlate the individual measured values with one another for evaluating the state or mode of operation of the pump.
  • the regulation of the pump speed and, if necessary, the regulation of the supply of the medium to be conveyed are considered.
  • the operator or the maintenance service or the manufacturer can be signaled that maintenance is necessary, which pump parts are to be replaced or that there is an acute risk of failure. Further advantages and details of the invention can be seen from the description and FIGS. 1 and 2.
  • Fig. 1 is a schematic representation of the pump with the arrangement of the monitoring devices
  • the eccentric screw pump 12 shown in FIG. 1 has a pressure transducer 16 and a temperature sensor 18 at the pump inlet 14.
  • a temperature sensor 22 and a measuring device 24 for measuring the wear on the stator 20, which consists of an elastic polymer.
  • a pressure transducer 26 is located at the pump outlet 25 to determine the pressure which the eccentric corner pump 12 generates and which is measured as a back pressure.
  • the wear of the joints, which sit between the drive shaft and the cardan shaft, is caused by the increasing operating time. Determined from the evaluation of the measured vibration and temperature values.
  • a temperature sensor 28 and a vibration sensor 30 are arranged in this area of the joint or in or on the joints themselves.
  • the area of the bearing of the drive shaft is also monitored with regard to temperature and occurring vibrations or oscillation value differences, which is why a temperature sensor 32, for example of the type PT 100, is used in this area, as in the other measuring areas.
  • a vibration sensor 34 monitors the vibrations caused by the bearing.
  • the pump can be controlled according to several methods, the measured values recorded by each measuring element being decisive in themselves, or a combination of several currently measured values or also currently measured and empirically determined measured values being compared with one another.
  • the pump can thus be operated product-related and wear-dependent.
  • the pressure transducer 16 and the temperature sensor 22 or a flow meter e.g. Values obtained according to the Coriolis principle therefore provide information for themselves or when comparing them with empirical values or values determined in preliminary tests on the state of wear of the rotor and stator. Depending on this determined pressure value or the gradients resulting therefrom, a reaction triggered by a controller then takes place. This reaction can e.g. with only a slight reduction in pressure mean an automatic increase in the pump speed. In the event of larger measured value deviations, the maintenance or the replacement of the corresponding pump parts is signaled to the operator or to the manufacturer or maintenance company connected via a data network by means of a data logger 26. To monitor wear on the stator, the stator either has vulcanized wear marks or proximity "ög" indicators.
  • the temperature sensor is screwed into the supply line using a threaded sleeve.
  • the joint temperature is sensed by the temperature sensor in the joint, which is connected to the control station 38 via a hole in the drive shaft.
  • the value of the back pressure or its gradient in the pump outlet can be taken into account in order to reduce joint wear by regulating the speed, so that an extension of the service life of the joint or the immediate imminent failure of the pump is avoided.
  • a scanning or recording of the vibrations generated by the joint and the changes in measured values due to wear or their gradients also result in the prerequisites for a direct reaction to the pump operation or a correlation with other operating parameters such as temperature, pump speed or torque.
  • the vibrations caused by the rotation of the joint can be represented either by means of an accelerometer or by means of a vibration measurement using the laser doubling method.
  • Another possibility of monitoring the operation of an eccentric screw pump is to record the measurement data which can be tapped from the bearing of the pump drive shaft and which are used alone or in combination with other pump parameters. These include the pump pressure at the pump outlet 25, the detection of the speed by the speed sensor on the clutch or the drive, or the medium temperature by means of temperature sensors 18 in the pump housing.
  • the bearing data also relate to the bearing temperature, which can be sensed directly via the temperature sensor 32 or by detecting the vibration values that can be tapped from the bearing by means of acceleration sensors or sound measurement or vibration measurement, corresponding to the measuring devices used, for example, in joint monitoring.
  • 2 shows a monitoring of a system consisting, for example, of 4 pumps. Although only some of the measurable pump operating parameters, such as the pressure at the pump outlet and the temperature in the inlet area and in the rotor / stator area, are recorded and used for control purposes, the complexity of the system can be seen.
  • the status information provided by the eccentric screw pumps reaches their control stations, which at the same time have a control device.
  • control devices regulate the pump parameters, such as, for example, the speed of the drive , and forward calculated or directly tapped values to a data logger 26.
  • This data logger delivers the data via a modem 32 to an external or internal data network, which means that pump operation can be monitored both locally and worldwide. If necessary, a repair or maintenance can be arranged.
  • the pump can be operated both on site and via the Internet. This means that regulation is initiated not only on the basis of appropriate signals, but that the pump operation can also be intervened by remote control.

Abstract

The invention relates to a method and a device for monitoring eccentric screw pumps with regard to measurement data that can be collected from the rotor, stator, articulated joint(s), bearings, pump inlet and outlet.

Description

Verfahren und Vorπchtung zum Betreiben einer Schneckenpumpe Method and device for operating a screw pump
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Betreiben einer Schneckenpumpe.The invention relates to a method and a device for operating a screw pump.
Aus der DE 196 49 766 ist ein Verfahren zum temperaturabhängigen Betreiben von Schneckenpumpen bekannt, bei dem die Temperatur des geforderten Mediums im Einlaßbereich der Pumpe und in der Pumpe ' selbst gemessen wird. Der Temperaturunterschied zwischen diesen beiden gemessenen Temperaturwerten wird mit vorgegebenen Toleranzwerten verglichen und zur Regelung der Pumpe herangezogen. Bei diesem Verfahren steht in erster Linie der Schutz des Stators und des Rotors gegen unzulässig hohe Temperaturen im Vordergrund, die z.B. beim Trockenlauf der Pumpe auftreten könnten.From DE 196 49 766 a method for temperature-dependent operation of screw pump is known in which the temperature of the medium required in the inlet region of the pump and in the pump 'itself is measured. The temperature difference between these two measured temperature values is compared with predetermined tolerance values and used to control the pump. This method primarily focuses on protecting the stator and the rotor against impermissibly high temperatures, which could occur, for example, when the pump runs dry.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, wodurch die Pumpe, insbesondere der Rotor, der Stator, das oder die Gelenke und die Lagerung während des Betriebes auf ihren Zustand hin überwacht werden können.The invention has for its object to provide a method and a device, whereby the pump, in particular the rotor, the stator, the one or more joints and the bearing during operation can be monitored for their condition.
Diese Aufgabe wird bei einem Verfahren der eingangs angegebenen Art durch die Merkmale der Ansprüche 1-5, in Bezug auf die Vorrichtung durch die Merkmale des Anspruchs 6, gelöst.This object is achieved in a method of the type specified at the outset by the features of claims 1-5, in relation to the device by the features of claim 6.
Die Erfindung geht davon aus, daß es beim Einsatz von Schneckenpumpen möglich wäre, durch die ständige Überwachung einzelner Betriebsparameter, die sich auf die Mediumstemperaturen, Lagerung, die Gelenke, den Stator und den Rotor beziehen, eine Optimierung der Pumpenbetriebsweise zu erreichen. Dabei kann auf wechselnde Betriebstemperaturen und nicht zu kontrollierende Gegendrücke unmittelbar reagiert werden. Der routinemäßige Austausch von Verschleißteilen wie Rotor und Stator erübrigt sich, nachdem auf den tatsächlichen Bedarfsfall abgestellt werden kann. Diese Art Fremdüberwachung betrifft insbesondere den Einsatz der Pumpen im Off- und Onshorebereich, sowie in Bereichen mit aufwendiger Zugänglichkeit der Pumpen für Wartungszwecke. Entsprechend eines ersten erfindungsgemäßen Verfahxensschrittes werden im Bereich der Lagerung die Temperatur und/oder die auftretenden Schwingungen gemessen. Die dabei gemessenen Istwerte werden verglichen mit vorgegebenen Sollwerten. Aus den daraus resultierenden Meßwertunterschieden können Rückschlüsse auf den Zustand der Lagerung oder die momentane Betriebsweise der Pumpe gezogen werden. Durch die Abtastung der Temperatur im Lagerbereich sind auch Rückschlüsse auf den Verschleißzustand des Gelenks möglich.The invention is based on the fact that when using screw pumps it would be possible to achieve an optimization of the pump operating mode by constantly monitoring individual operating parameters relating to the medium temperatures, bearings, the joints, the stator and the rotor. It can react immediately to changing operating temperatures and back pressures that cannot be controlled. The routine replacement of wearing parts such as the rotor and stator is no longer necessary once the actual need can be met. This type of external monitoring affects in particular the use of the pumps in the offshore and onshore areas, as well as in areas with complex accessibility of the pumps for maintenance purposes. According to a first method step according to the invention, the temperature and / or the vibrations occurring are measured in the area of the bearing. The actual values measured in the process are compared with predetermined target values. From the resulting differences in measured values, conclusions can be drawn about the state of the bearing or the current mode of operation of the pump. The temperature in the bearing area can also be used to draw conclusions about the state of wear of the joint.
In einer weiteren erfindungsgemäßen Verfahrensgestaltung wird der Zustand der oder des Gelenke/s durch Abtastung der im Bereich der Gelenke und/oder Lagerung auftretenden Temperatur und/oder Schwingungen überwacht, wobei beim Auftreten von Änderungen der Temperatur- und/oder Schwingungswerte, die sich aus dem Vergleich der gemessenen Istwerte zu vorgegebenen Sollwerten ergeben, automatisch Zustandsmeldungen erfolgen und/oder Regelungsmaßnahmen eingeleitet werden.In a further design of the method according to the invention, the condition of the joint (s) is monitored by scanning the temperature and / or vibrations occurring in the area of the joints and / or bearing, with the occurrence of changes in the temperature and / or vibration values resulting from the Comparison of the measured actual values with specified target values, status reports are carried out automatically and / or control measures are initiated.
In einer weiteren vorteilhaften Verfahrensgestaltung der Erfindung wird der Zustand des Rotors und/oder des Stators durch Abtastung der im Rotor-Statorbereich auftretenden Temperatur und/oder der Temperatur des Mediums und/oder durch Ausweitung der im Ein- oder Auslaßbereich der Pumpe auftretenden Drücke und/oder durch Verschleißmessung am Rotor überwacht. Änderungen die sich aus dieser aktuellen Messung im Vergleich mit vorgegebenen Sollwerten ergeben, führen automatisch zu Zustandsmeldungen und/oder Regelungsmaßnahmen.In a further advantageous embodiment of the method of the invention, the state of the rotor and / or the stator is determined by scanning the temperature and / or the temperature of the medium occurring in the rotor-stator region and / or by expanding the pressures and / or occurring in the inlet or outlet region of the pump. or monitored by wear measurement on the rotor. Changes that result from this current measurement in comparison with specified target values automatically lead to status messages and / or control measures.
In einer weiteren erfindungsgemäßen Verfahrensgestaltung werden die gemessenen Temperatur- und/oder Schwingungs- und/oder Druck- und/oder Wanddicken- und/oder Verschleißwerte einer Datenverarbeitung zugeleitet und von dieser durch Fernübertragung dem Pumpenbetreiber und/oder dem Pumpenhersteller für Wartungszwecke und/oder für Betriebseinstellun 'Oge'n zugeführt.In a further design of the method according to the invention, the measured temperature and / or vibration and / or pressure and / or wall thickness and / or wear values are fed to data processing and from there by remote transmission to the pump operator and / or the pump manufacturer for maintenance purposes and / or for Operating settings' Oge'n fed.
In einer erfindungsgemäßen Ausgestaltung der Vorrichtung zur Durchführung des Verfahrens zum Betreiben einer Schneckenpumpe ist die Schneckenpumpe im Bereich der Lagerung mit mindestens einem Temperaturfühler und/oder im Bereich der Gelenke oder des Gelenks mit mindestens einem Temperaturfühler und/oder im Pumpenein- oder Pumpenauslaßbereich mit Druckmeßumformern versehen. Im Bereich der Lagerung und im Gelenkbereich können Schwingungssensoren angebracht sein. Alle von den Temperaturfühlern, den Druckmeßumformern, Schwingungssensoren und den Verschleißanzeigen gesendeten Signale werden beispielsweise einer Datenverarbeitung zugeführt, der diese per Datenübertragung dem Pumpenbetreiber und/oder dem Pumpenhersteller und/oder einem Dienstleistungsunternehmen für Überwachungszwecke übermittelt.In an embodiment of the device according to the invention for carrying out the method for operating a screw pump, the screw pump is provided with at least one temperature sensor in the area of the bearing and / or with at least one temperature sensor in the area of the joints or the joint and / or in the pump inlet or pump outlet area with pressure transducers , Vibration sensors can be attached in the area of the bearing and in the joint area. All signals sent by the temperature sensors, the pressure transducers, vibration sensors and the wear indicators are, for example, fed to a data processing unit which transmits them to the pump operator and / or the pump manufacturer and / or a service company for monitoring purposes.
Durch entsprechende Softwareprogramme können die einzelnen Meßwerte miteinander korreliert für die Bewertung des Zustandes bzw. der Betriebsweise der Pumpe verwendet werden. Hierbei ist an die Regelung der Pumpendrehzahl und gegebenenfalls an die Regelung der Zufuhr des zu fördernden Mediums gedacht. Zusätzlich kann dem Betreiber oder dem Wartungsdienst oder dem Hersteller signalisiert werden, daß eine Wartung notwendig ist, welche Pumpenteile auszutauschen sind oder daß akute Ausfallgefahr besteht. Weitere Vorteile und Einzelheiten der Erfindung sind erkennbar aus der Beschreibung und den Figuren 1 und 2.Corresponding software programs can be used to correlate the individual measured values with one another for evaluating the state or mode of operation of the pump. Here, the regulation of the pump speed and, if necessary, the regulation of the supply of the medium to be conveyed are considered. In addition, the operator or the maintenance service or the manufacturer can be signaled that maintenance is necessary, which pump parts are to be replaced or that there is an acute risk of failure. Further advantages and details of the invention can be seen from the description and FIGS. 1 and 2.
Es zeigt:It shows:
Fig. 1 Eine schematische Darstellung der Pumpe mit der Anordnung der ÜberwachungseinrichtungenFig. 1 is a schematic representation of the pump with the arrangement of the monitoring devices
Fig. 2Fig. 2
Schematische Darstellung der Vernetzung mehrerer PumpenSchematic representation of the networking of several pumps
Die in Fig. 1 dargestellte Exzenterschneckenpumpe 12 weist am Pumpeneinlaß 14 einen Druckmeßumformer 16 und einen Temperaturfühler 18 auf. Im Bereich des Stators 20 und des darin nicht dargetellten rotierenden Rotors befindet sich ein Temperaturfühler 22 und eine Meßeinrichtung 24 zum Messen des Verschleißes am Stator 20. der aus einem elastischen Polymer besteht. Am Pumpenauslaß 25 sitzt zur Ermittlung des Drucks den die Exzenterscrmeckenpumpe 12 erzeugt und der als Gegendruck gemessen wird ein Druckmeßumformer 26. Der mit zunehmender Betriebsdauer hervorgerufene Verschleiß der Gelenke, die zwischen der Antriebs- und der Gelenkwelle sitzen, wird durch die. Aus Wertung der gemessenen Schwingungs- und Temperaturwerte festgestellt. Dazu sind in diesem Bereich des Gelenks oder in oder an den Gelenken selbst ein Temperaturfühler 28 und ein Schwingungssensor 30 angeordnet. Auch der Bereich der Lagerung der Antriebswelle wird hinsichtlich Temperatur und auftretender Schwingungen bzw. Schwingungswertunterschiede überwacht, welshalb in diesem Bereich, wie auch in den anderen Meßbereichen, ein Temperaturfühler 32 zum Beispiel der Type PT 100 zum Einsatz kommt. Zusätzlich überwacht ein Schwingungssensor 34 die von der Lagerung verursachten Schwingungen.The eccentric screw pump 12 shown in FIG. 1 has a pressure transducer 16 and a temperature sensor 18 at the pump inlet 14. In the area of the stator 20 and the rotating rotor, not shown therein, there is a temperature sensor 22 and a measuring device 24 for measuring the wear on the stator 20, which consists of an elastic polymer. A pressure transducer 26 is located at the pump outlet 25 to determine the pressure which the eccentric corner pump 12 generates and which is measured as a back pressure. The wear of the joints, which sit between the drive shaft and the cardan shaft, is caused by the increasing operating time. Determined from the evaluation of the measured vibration and temperature values. For this purpose, a temperature sensor 28 and a vibration sensor 30 are arranged in this area of the joint or in or on the joints themselves. The area of the bearing of the drive shaft is also monitored with regard to temperature and occurring vibrations or oscillation value differences, which is why a temperature sensor 32, for example of the type PT 100, is used in this area, as in the other measuring areas. In addition, a vibration sensor 34 monitors the vibrations caused by the bearing.
Die Steuerung der Pumpe kann nach mehreren Methoden erfolgen, wobei die von jedem Meßelement erfaßten Meßwerte für sich allein maßgebend sind oder mehrere aktuell gemessene kombiniert oder aber auch aktuell gemessene und empirisch ermittelte Meßwerte miteinander verglichen werden. Damit läßt sich die Pumpe produktbezogen und verschleißabhängig betreiben.The pump can be controlled according to several methods, the measured values recorded by each measuring element being decisive in themselves, or a combination of several currently measured values or also currently measured and empirically determined measured values being compared with one another. The pump can thus be operated product-related and wear-dependent.
Die vom Druckmeßumformer 16 und dem Temperatursensor 22 oder einem Durchflußmeßgerät, z.B. nach dem Coriolis-Prinzip erhaltenen Werte, geben somit für sich selbst oder beim Vergleich mit empirischen oder in Vorversuchen ermittelten Werten Hinweise auf den Verschleißzustand von Rotor und Stator. In Abhängigkeit von diesem ermittelten Druckwert oder den daraus sich ergebenden Gradienten erfolgt daraufhin eine über eine Steuerung ausgelöste Reaktion. Diese Reaktion kann z.B. bei nur geringfügiger Druckreduzierung eine automatische Erhöhung der Pumpendrehzahl bedeuten. Bei größeren Meßwertabweichungen wird dem Betreiber oder dem über ein Datennetz mittels eines Datenloggers 26 verbundenen Hersteller oder Wartungsunternehmen die Wartung bzw. der Austausch der entsprechenden Pumpenteile signalisiert. Zur Verschleißüberwachung des Stators besitzt dieser entweder einvulkanisierte Verschleißmarken oder Näherun "ög"sindikatoren.The pressure transducer 16 and the temperature sensor 22 or a flow meter, e.g. Values obtained according to the Coriolis principle therefore provide information for themselves or when comparing them with empirical values or values determined in preliminary tests on the state of wear of the rotor and stator. Depending on this determined pressure value or the gradients resulting therefrom, a reaction triggered by a controller then takes place. This reaction can e.g. with only a slight reduction in pressure mean an automatic increase in the pump speed. In the event of larger measured value deviations, the maintenance or the replacement of the corresponding pump parts is signaled to the operator or to the manufacturer or maintenance company connected via a data network by means of a data logger 26. To monitor wear on the stator, the stator either has vulcanized wear marks or proximity "ög" indicators.
Hinweis auf den Zustand des Gelenkes und auf eine damit abzuleitende Wartung bzw. einen Austausch ergibt die Auswertung bzw. der Vergleich der erhaltenen Meßwerte von der Abtastung der Mediumstemperatur von der Zulaufleitung und der Abtastung der Gelenktemperatur im antriebsseitigen Gelenk, wobei die Werte eines Betriebsstundenzählers zusätzlich Einfluß nehmen können. Hierbei ist der Temperaturfühler mittels Gewindemuffe in die Zulaufleitung eingeschraubt. Die Gelenktemperatur erfaßt der Temperaturfühler im Gelenk, der über eine Bohrung in der Antriebswelle mit dem Kontrollstand 38 verbunden ist. Zusätzlich zur Temperaturauswertung oder deren Gradienten kann der Wert des Gegendrucks oder dessen Gradient im Pumpenauslaß berücksichtigt .werden, um den Gelenkverschleiß durch Regelung der Drehzahl zu reduzieren, damit eine Verlängerung der Standzeit des Gelenks bzw. der akut drohende sofortige Ausfall der Pumpe vermieden wird.Reference to the condition of the joint and to maintenance or an exchange to be derived therefrom results from the evaluation or comparison of the measured values obtained by scanning the medium temperature from the inlet line and scanning the joint temperature in the drive-side joint, the values of an operating hours counter also having an influence can take. The temperature sensor is screwed into the supply line using a threaded sleeve. The joint temperature is sensed by the temperature sensor in the joint, which is connected to the control station 38 via a hole in the drive shaft. In addition to the temperature evaluation or its gradient, the value of the back pressure or its gradient in the pump outlet can be taken into account in order to reduce joint wear by regulating the speed, so that an extension of the service life of the joint or the immediate imminent failure of the pump is avoided.
Weitere Möglichkeiten den Zustand des Gelenks zu überwachen ergeben sich aus dem Einsatz einer berührungslos arbeitenden Drehmomentmeßnabe durch Lichtmengenmessung zwischen dem Antrieb 40 und dem Gelenk. Je nachdem, welchen Drehmomentunterschied die Meßnabe zwischen dem zugeführten und dem abgegebenen Drehmoment am Gelenk feststellt, kann der Betrieb der Pumpe reguliert werden.Further possibilities for monitoring the condition of the joint result from the use of a contactlessly operating torque measuring hub by measuring the amount of light between the drive 40 and the joint. The operation of the pump can be regulated depending on which torque difference the measuring hub detects between the supplied and the output torque at the joint.
Auch eine Abtastung bzw. Erfassung der vom Gelenk erzeugten Schwingungen und der durch Verschleiß entstehenden Meßwertänderungen oder deren Gradienten ergibt die Voraussetzung für eine direkte Reaktionsmöglichkeit auf den Pumpenbetrieb oder eine Korrelierung mit anderen Betriebsparametern, wie Temperatur, Pumpendrehzahl oder Drehmoment. Die von der Rotation des Gelenks herbeigeführten Schwingungen sind entweder über Beschleunigungsmeßaufnehmer oder über Schwingungsmessung nach dem Laser-Doppier- Verfahren darstellbar.A scanning or recording of the vibrations generated by the joint and the changes in measured values due to wear or their gradients also result in the prerequisites for a direct reaction to the pump operation or a correlation with other operating parameters such as temperature, pump speed or torque. The vibrations caused by the rotation of the joint can be represented either by means of an accelerometer or by means of a vibration measurement using the laser doubling method.
Eine weitere Möglichkeit der Überwachung des Betriebs einer Exzenterschneckenpumpe liegt im Erfassen der vom Lager der Pumpenantriebswelle abgreifbaren Meßdaten, die für sich allein oder in Kombination mit weiteren Pumpenparametern Verwendung finden. Hierzu zählen der Pumpendruck am Pumpenauslaß 25, die Erfassung der Drehzahl durch Drehzahlgeber an Kupplung oder dem antrieb oder der Mediύmstemperatur durch Temperaturfühler 18 im Pumpengehäuse.Another possibility of monitoring the operation of an eccentric screw pump is to record the measurement data which can be tapped from the bearing of the pump drive shaft and which are used alone or in combination with other pump parameters. These include the pump pressure at the pump outlet 25, the detection of the speed by the speed sensor on the clutch or the drive, or the medium temperature by means of temperature sensors 18 in the pump housing.
Die Lagerdaten beziehen sich auch auf die Lagertemperatur, die direkt über den Temperaturfühler 32 abgetastet werden kann oder durch Erfassung der vom Lager abgreifbaren Schwingungswerte über Beschleunigungsmeßaufnehmer bzw. Schallmessung oder Schwingungsmessung, entsprechend den Meßeinrichtungen wie sie z.B. bei der Gelenküberwachung zum Einsatz kommen. Die Fig.2 zeigt eine Überwachung einer beispielsweise aus 4 Pumpen bestehenden Anlage. Obwohl hier nur ein Teil der erfaßbaren Pumpen-Betriebsparameter, wie der Druck am Pumpenauslaß und die Temperatur im Einlaßbereich und im Rotor- /Statorbereich, erfaßt und zur Steuerung genützt werden, wird die Komplexität der Anlage ersichtlich. Die von den Exzenterschneckenpumpen abgegebenen Zustandsinformationen gelangen zu ihren Kontrollständen, die gleichzeitig eine Steuereinrichtung aufweisen. Diese Steuereinrichtungen regeln die Pumpenparameter, wie z.B. die Drehzahl des Antriebs' und geben errechnete oder direkt abgegriffene Werte an einen Datenlogger 26 weiter. Dieser Datenlogger liefert die Daten über ein Modem 32 in ein externes oder internes Datennetz, wodurch sowohl vor Ort als auch weltweit eine Überwachung des Pumpenbetriebes stattfinden kann. Bei Bedarf kann eine Instandsetzung bzw. Wartung veranlaßt werden.The bearing data also relate to the bearing temperature, which can be sensed directly via the temperature sensor 32 or by detecting the vibration values that can be tapped from the bearing by means of acceleration sensors or sound measurement or vibration measurement, corresponding to the measuring devices used, for example, in joint monitoring. 2 shows a monitoring of a system consisting, for example, of 4 pumps. Although only some of the measurable pump operating parameters, such as the pressure at the pump outlet and the temperature in the inlet area and in the rotor / stator area, are recorded and used for control purposes, the complexity of the system can be seen. The status information provided by the eccentric screw pumps reaches their control stations, which at the same time have a control device. These control devices regulate the pump parameters, such as, for example, the speed of the drive , and forward calculated or directly tapped values to a data logger 26. This data logger delivers the data via a modem 32 to an external or internal data network, which means that pump operation can be monitored both locally and worldwide. If necessary, a repair or maintenance can be arranged.
Wird anstatt des Datenloggers ein Computer mit einem entsprechenden Wartungs- bzw. Steuerungsprogramm eingesetzt, so kann der Pumpenbetrieb sowohl vor Ort als auch über das Internet geschehen. Das bedeutet, daß nicht nur aufgrund entsprechender Signale eine Regulierung vor Ort eingeleitet wird, sondern daß auch über Fernsteuerung in den Pumpenbetrieb eingegriffen werden kann. If a computer with a corresponding maintenance or control program is used instead of the data logger, the pump can be operated both on site and via the Internet. This means that regulation is initiated not only on the basis of appropriate signals, but that the pump operation can also be intervened by remote control.

Claims

Patentansprüche claims
1.1.
Verfahren zum Betreiben einer Schneckenpumpe, dadurch gekennzeichnet, daß der Zustand der Lagerung durch Abtastung der im Bereich der Lagerung auftretenden Temperatur und/oder der im Bereich der Lagerung auftretenden Schwingungen überwacht wird, wobei beim Auftreten von Änderungen der Temperatur- und/oder Schwingungswerte, die sich aus dem Vergleich der gemessenen Istwerte zu vorgegebenen Sollwerten ergeben, automatisch Zustandsmeldungen erfolgen und/oder Regelungsmaßnahmen eingeleitet werden.Method for operating a screw pump, characterized in that the condition of the bearing is monitored by scanning the temperature occurring in the area of the bearing and / or the vibrations occurring in the area of the bearing, whereby when changes in the temperature and / or vibration values occur, the result from the comparison of the measured actual values with specified target values, status reports are made automatically and / or control measures are initiated.
2. Verfahren zum Betreiben einer Schneckenpumpe, dadurch gekennzeichnet, daß der Zustand der oder des Gelenke/s durch Abtastung der im Bereich der Gelenke und/oder Lagerung auftretenden Temperatur und/oder Schwingungen überwacht wird, wobei beim Auftreten von Änderungen der Temperatur- oder Schwingungswerte, die sich aus dem Vergleich der gemessenen Istwerte zu vorgegebenen Sollwerten ergeben, automatisch Zustandsmeldungen erfolgen und/oder Regelungsmaßnahmen eingeleitet werden.2. A method of operating a screw pump, characterized in that the state of the or the joints / s is monitored by scanning the temperature and / or vibrations occurring in the area of the joints and / or storage, with the occurrence of changes in the temperature or vibration values , which result from the comparison of the measured actual values with specified target values, status reports are automatically carried out and / or control measures are initiated.
j .j.
Verfahren zum Betreiben einer Schrieckenpumpe dadurch gekennzeichnet, daß der Zustand des Rotors und/oder Stators durch Abtastung der im Rotor- Statorbereich auftretenden Temperatur und/oder der Temperatur des Mediums und/oder durch Auswertung der im Ein- und/oder Auslaßbereich der Pumpe auftretenden Drücke überwacht wird, wobei beim Auftreten von Änderungen der Temperatur- und/oder der Druckwerte, die sich' aus dem Vergleich der gemessenen Istwerte zu vorgegebenen Sollwerten ergeben, automatisch Zustandsmeldungen erfolgen und/oder Regelungsmaßnahmen eingeleitet werden. Method for operating a Schrieckenpump characterized in that the state of the rotor and / or stator by scanning the temperature occurring in the rotor-stator area and / or the temperature of the medium and / or by evaluating the pressures occurring in the inlet and / or outlet area of the pump is monitored, status changes and / or control measures being initiated automatically when changes in the temperature and / or the pressure values, which result from the comparison of the measured actual values with predetermined setpoints, occur.
4.4th
Verfahren zum Betreiben einer Schneckenpumpe, dadurch gekennzeichnet, daß der Zustand des Stators durch Verschleißmessung überwacht wird, wobei beim Auftreten von Änderungen, die sich aus dem Vergleich der gemessenen Istwerte zu vorgegebenen Sollwerten ergeben, automatisch Zustandsmeldungen erfolgen und/oder Regelungsmaßnahmen eingeleitet werden.Method for operating a screw pump, characterized in that the state of the stator is monitored by wear measurement, with status messages and / or control measures being initiated automatically when changes occur, which result from the comparison of the measured actual values with predetermined target values.
5.5th
Verfahren zum Betreiben einer Schneckenpumpe nach einem der Ansprüche 1-4 dadurch gekennzeichnet, daß die gemessenen Temperatur- und/oder Schwingungs- und/oder Druck- und/oder Wanddicken- und/oder Verschleißwerte einer Datenverarbeitung zugeleitet und/oder von dieser durch Fernübertragung dem Pumpenbetreiber und/oder dem Pumpenhersteller oder einem Dienstleistungsunternehmen für Wartungszwecke und/oder Betriebseinstellungen zugeführt werden.Method for operating a screw pump according to one of claims 1-4, characterized in that the measured temperature and / or vibration and / or pressure and / or wall thickness and / or wear values are fed to data processing and / or from there by remote transmission to the Pump operator and / or the pump manufacturer or a service company for maintenance purposes and / or operational settings.
6. Vorrichtung zur Durchführung des Verfahrens nach den Ansprüchen 1-5, dadurch gekennzeichnet, daß die Schneckenpumpe im Bereich der Lagerung Temperaturfühler und/oder im Bereich der oder des Gelenks/Gelenke Temperaturfühler und/oder im Pumpeneinoder — auslaßbereich Druckmeßumformer und/oder Temperaturfühler und/oder im Bereich des Stators eine Verschleißanzeige und/oder im Bereich der Lagerung Schwingungsmesser aufweist.6. Device for performing the method according to claims 1-5, characterized in that the screw pump in the storage temperature sensor and / or in the area of the or the joint / joints temperature sensor and / or in the pump inlet or outlet area pressure transducer and / or temperature sensor and / or has a wear indicator in the area of the stator and / or vibration meter in the area of the bearing.
7.7th
Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Schneckenpumpe im Bereich des oder der Gelenke Schwingungsmesser aufweist. Apparatus according to claim 6, characterized in that the screw pump has a vibration meter in the region of the joint or joints.
EP01943088A 2000-05-19 2001-05-15 Method and device for operating a screw pump Withdrawn EP1196693A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10024430 2000-05-19
DE10024430 2000-05-19
DE10063953A DE10063953A1 (en) 2000-05-19 2000-12-20 Method and device for operating a screw pump
DE10063953 2000-12-20
PCT/DE2001/001853 WO2001088379A1 (en) 2000-05-19 2001-05-15 Method and device for operating a screw pump

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US9745979B2 (en) 2012-04-11 2017-08-29 Itt Manufacturing Enterprises Llc Method for rotary positive displacement pump protection
US10495084B2 (en) 2012-04-11 2019-12-03 Itt Manufacturing Enterprises Llc Method for twin screw positive displacement pump protection
CN104454482A (en) * 2014-10-23 2015-03-25 江西新德工业泵有限责任公司 Conveying pump provided with mechanical seal leakage detection device
DE102020111386A1 (en) * 2020-04-27 2021-10-28 Vogelsang Gmbh & Co. Kg Condition detection on eccentric screw pumps
DE102021121572A1 (en) * 2021-08-19 2023-02-23 Hilger U. Kern Gmbh Method for determining the state of wear of an eccentric screw pump and eccentric screw pump for carrying out the method
CN114017317A (en) * 2021-12-03 2022-02-08 黄山黄泵单螺杆泵有限公司 Screw pump service life pretesting equipment

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JPS60150491A (en) * 1984-01-18 1985-08-08 Ebara Corp Abnormal operation concentrated predictor for pump
CA2058325A1 (en) * 1990-12-24 1992-06-25 Mark E. Baran Positive displacement pumps
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