EP0845598B1 - Method and apparatus for temperature dependent operation of pumps with helical rotors - Google Patents
Method and apparatus for temperature dependent operation of pumps with helical rotors Download PDFInfo
- Publication number
- EP0845598B1 EP0845598B1 EP97120796A EP97120796A EP0845598B1 EP 0845598 B1 EP0845598 B1 EP 0845598B1 EP 97120796 A EP97120796 A EP 97120796A EP 97120796 A EP97120796 A EP 97120796A EP 0845598 B1 EP0845598 B1 EP 0845598B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- screw
- type pump
- stator
- 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.)
- Expired - Lifetime
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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
- 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
- F04C2270/22—Temperature difference
Definitions
- the invention relates to a method and an apparatus for temperature-dependent operation of screw pumps, one of the Process steps the temperature of the pumped medium in the stator area is measured.
- the Eccentric screw pump has one in the stator part of the pump Temperature sensor on, the measuring tip in or near the inner surface the stator sits.
- the temperature sensor is in a control unit Connection that responds when a predetermined temperature is reached and controls the drive of the rotor via servo motor or control gear or shuts down.
- stators with heat sensitive materials proved to be advantageous, especially the surface temperature of the Monitor stator because of direct friction between stator and rotor is higher than inside the stator.
- the control unit responds to the temperature prevailing on the stator surface, of course Tolerance values can be taken into account.
- the temperature monitoring relates here only at temperatures in the stator area.
- the measures at Exceeding the temperature not acceptable for the stator range from immediate shutdown via speed control up to the supply of Lubricating media.
- the US PS 25 18 597 shows a centrifugal pump, in the pump housing A temperature measuring device is used directly in the area of the pump rotor is.
- the temperature sensor takes over the material of the housing the medium temperature.
- a monitoring device is known from US Pat. No. 2,940,395 Interruption of pump operation when there is insufficient flow and thus associated overheating of the pump.
- the pump housing has this a temperature sensor on the outside of the stator, which points to the different Temperatures during the oil production operation reacts. There is a possibility to drive when a certain one is reached Stop the maximum temperature at the stator and after the pump has cooled down start again at a lower temperature value.
- the invention has for its object a method and a device to create, causing the dry running of pumps with helical Rotors based on the evaluation of temperatures far below critical material load temperatures is possible.
- the task is carried out in a method of the type specified at the outset solved by the features of claim 1. It will continue to be with a device of the type mentioned by the features of Claim 4 solved.
- the essence of the invention is the pump Protect against dry running without orientation at the temperature load limit of the stator / rotor material. It has been shown that the dry running of a screw pump can already be recognized when the measured temperature in the pump is still far below or a permissible maximum temperature for the pump material used lies.
- the duration of the dosing will depend on the parameters (Duration of the pending temperature difference, amount of the difference) determined temperature difference. Numerous, partly inventive Refinements result from the subclaims.
- the pump arrangement shown in Fig. 1 consists of a Eccentric screw pump 10 with a stator 12 and an eccentric helical rotor 14 rotating around its longitudinal axis.
- the stator 12 On the pressure side, the stator 12 is connected to a pipe 16 in order to to supply the conveyed medium to other machining or processing points.
- the inlet housing 18 On the suction side, that is to the right of the stator, the inlet housing 18 is located in which the drive connections between the rotor 14 and the drive 20 are housed. To compensate for the eccentricity of the rotor are corresponding to the drive shaft of the drive Joint connections or so-called bending rods are used.
- Inlet housing To support the delivery of the medium in the pump can in Inlet housing additional conveyors (screws or shovels) be provided.
- the nozzle 22 can be used to introduce the medium Pipeline or a funnel or corresponding metering devices be assigned.
- stator usually lined with elastic material 12 and the rotor 14 made of rigid material is created by the Rotation of the eccentrically mounted rotor without heat Pumped medium for overheating and thus to a standstill and Destruction of the pump 10 or the drive 20 can result.
- Temperature sensors 24, 26 are with a temperature controller, for example a differential temperature controller 28 via lines 30, 32 connected.
- the difference temperature controller 28 is directly above Power section via line 34 with the drive 20 in connection.
- the operation of the differential temperature controller 28 is so in Fig. 1 chosen that when a certain temperature difference is reached between the temperature sensors 24, 26 switches off the drive, the Speed controls or briefly reverses the direction of rotation and switches off or reverses again.
- the setting and visual display of a maximum allowable temperature or differential temperature can be entered via the input field 36 of the temperature difference controller 28 with the display 38.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum temperaturabhängigen Betreiben von Schneckenpumpen, wobei in einem der Verfahrensschritte die Temperatur des geförderten Mediums im Statorbereich gemessen wird.The invention relates to a method and an apparatus for temperature-dependent operation of screw pumps, one of the Process steps the temperature of the pumped medium in the stator area is measured.
Aus der DE 23 11 770 A1 ist ein Verfahren und eine Anordnung zur Überwachung des Betriebes von Exzenterschneckenpumpen bekannt. Die Exzenterschneckenpumpe weist hier im Statorteil der Pumpe einen Temperaturfühler auf, dessen Meßspitze in oder nahe der inneren Oberfläche des Stators sitzt. Der Temperaturfühler steht mit einem Regelgerät in Verbindung, das bei Erreichen einer vorgestimmten Temperatur anspricht und den Antrieb des Rotors über Servomotor oder Regelgetriebe regelt bzw. stillsetzt. Insbesondere bei Statoren mit hitzeempfindlichen Werkstoffen hat es sich hierbei als vorteilhaft erwiesen, vor allem die Oberflächentemperatur des Stators zu überwachen, da sie aufgrund der direkten Reibung zwischen Stator und Rotor höher liegt als im Inneren des Stators. Das Regelgerät reagiert auf die an der Statoroberfläche herrschende Temperatur, wobei natürlich Toleranzwerte berücksichtigt werden können. Bei extrem langen Pumpen können mehrere Temperaturfühler auf die Statorlänge verteilt werden, um auf unzulässige Erwärmungen an der Innenfläche des Stators in mehreren Teilbereichen zu reagieren. Die Temperaturüberwachung bezieht sich hier ausschließlich auf Temperaturen im Statorbereich. Die Maßnahmen beim Überschreiten der für den Stator nicht zuträglichen Temperatur reichen von sofortigem Abschalten über Drehzahlregulierung bis hin zur Zufuhr von Schmiermedien. DE 23 11 770 A1 describes a method and an arrangement for Monitoring the operation of eccentric screw pumps known. The Eccentric screw pump has one in the stator part of the pump Temperature sensor on, the measuring tip in or near the inner surface the stator sits. The temperature sensor is in a control unit Connection that responds when a predetermined temperature is reached and controls the drive of the rotor via servo motor or control gear or shuts down. Especially in stators with heat sensitive materials proved to be advantageous, especially the surface temperature of the Monitor stator because of direct friction between stator and rotor is higher than inside the stator. The control unit responds to the temperature prevailing on the stator surface, of course Tolerance values can be taken into account. For extremely long pumps can be distributed over the stator length to several temperature sensors inadmissible heating on the inner surface of the stator in several To respond to partial areas. The temperature monitoring relates here only at temperatures in the stator area. The measures at Exceeding the temperature not acceptable for the stator range from immediate shutdown via speed control up to the supply of Lubricating media.
Die US PS 25 18 597 zeigt eine Kreiselpumpe, in deren Pumpengehäuse direkt im Bereich des Pumpenrotors eine Temperaturmeßeinrichtung eingesetzt ist. Der Temperaturfühler nimmt über das Material des Gehäuses die Mediumtemperatur auf. Gleichzeitig dazu sitzt ein Temperaturfühler im Antrieb. Beide Temperaturfühler sind miteinander verbunden und reagieren über ein Relais auf unzulässige Temperaturen mit dem Abschalten des Antriebs.The US PS 25 18 597 shows a centrifugal pump, in the pump housing A temperature measuring device is used directly in the area of the pump rotor is. The temperature sensor takes over the material of the housing the medium temperature. At the same time there is a temperature sensor in the drive. Both temperature sensors are connected to each other and react to impermissible temperatures with the via a relay Switch off the drive.
Aus der US PS 29 40 395 ist eine Überwachungseinrichtung bekannt zur Unterbrechung des Pumpenbetriebs bei ungenügender Fördermenge und damit verbundener Überhitzung der Pumpe. Das Pumpengehäuse hat hierzu einen Temperaturfühler an der Außenseite des Stators, der auf die unterschiedlichen Temperaturen während des Ölförderbetriebs reagiert. Es besteht die Möglichkeit, den Antrieb bei Erreichen einer bestimmten Höchsttemperatur am Stator zu stoppen und nach dem Abkühlen der Pumpe bei einem niedrigeren Temperaturwert erneut zu starten.A monitoring device is known from US Pat. No. 2,940,395 Interruption of pump operation when there is insufficient flow and thus associated overheating of the pump. The pump housing has this a temperature sensor on the outside of the stator, which points to the different Temperatures during the oil production operation reacts. There is a possibility to drive when a certain one is reached Stop the maximum temperature at the stator and after the pump has cooled down start again at a lower temperature value.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, wodurch der Trockenlauf von Pumpen mit schneckenförmigen Rotoren auf Grund der Auswertung von Temperaturen weit unterhalb kritischer Materialbelastungstemperaturen möglich ist.The invention has for its object a method and a device to create, causing the dry running of pumps with helical Rotors based on the evaluation of temperatures far below critical material load temperatures is possible.
Die Aufgabe wird bei einem Verfahren der eingangs angegebenen Art durch die Merkmale des Anspruchs 1 gelöst. Sie wird weiterhin bei einer Vorrichtung der eingangs genannten Art durch die Merkmale des Anspruchs 4 gelöst. Der Kern der Erfindung besteht darin, die Pumpe gegen Trockenlauf zu schützen ohne Orientierung an der Temperaturbelastungsgrenze des Stator-/Rotormaterials. Es hat sich gezeigt, daß der Trockenlauf einer Schneckenpumpe bereits dann erkennbar ist, wenn die gemessene Temperatur in der Pumpe noch weit unterhalb der bzw. einer zulässigen Höchsttemperatur für das eingesetzte Pumpenmaterial liegt. The task is carried out in a method of the type specified at the outset solved by the features of claim 1. It will continue to be with a device of the type mentioned by the features of Claim 4 solved. The essence of the invention is the pump Protect against dry running without orientation at the temperature load limit of the stator / rotor material. It has been shown that the dry running of a screw pump can already be recognized when the measured temperature in the pump is still far below or a permissible maximum temperature for the pump material used lies.
Erfindungsgemäß läßt sich das bevorstehende Auftreten bzw. Eintreten des Trockenlaufs rechtzeitig vermeiden, indem die Temperatur des geförderten Mediums im Einlaßbereich der Pumpe und in der Pumpe selbst gemessen wird, daß der Temperaturunterschied dieser beiden Temperaturen ermittelt wird und daß die Pumpe aufgrund dieses ermittelten Temperaturunterschiedes im Vergleich zu einem vorgegebenen Toleranzwert geregelt wird. Die bisherigen Überwachungsverfahren zum Schutz gegen Trockenlauf gingen davon aus, den Betrieb der Pumpe bis zu einem Temperaturwert zu führen, der gerade noch unschädlich für das Material des Stators ist. Dabei wurde die Reaktionszeit der Überwachung unnötig erhöht, nachdem man das Medium, den Stator und den Rotor unnötigerweise auf Temperaturen aufheizte, die für die Erkennung des Trockenlaufs nicht notwendig waren.According to the forthcoming occurrence or occurrence Avoid dry running in time by changing the temperature of the pumped medium in the inlet area of the pump and in the pump itself it is measured that the temperature difference between these two Temperatures is determined and that the pump due to this determined temperature difference compared to a predetermined Tolerance value is regulated. The previous monitoring procedures for Protection against dry running assumed operation of the pump up to a temperature value that is just harmless to the Material of the stator is. The response time of monitoring was unnecessarily increased after looking at the medium, the stator and the rotor unnecessarily heated up to temperatures necessary for the detection of the Dry running was not necessary.
Es hat sich gezeigt, daß die Erhöhung der Mediumstemperatur um bereits wenige Grad Celsius der Indikator für das Eintreten des Trockenlaufs sein kann. Zur Feststellung einer Temperaturerhöhung vergleicht man deshalb die Temperatur des Mediums im Einlaßbereich der Pumpe, was die zuführende Rohrleitung oder das Einlaufgehäuse der Pumpe selbst sein kann, mit dem Bereich der Pumpe selbst, dem eigentlichen Rotor-/Statorbereich. Schon die Erhöhung der Temperatur des Mediums um einen Wert von ca. 5 °C bzw. eine Differenz von 10 °C kann es aufgrund empirisch ermittelter Werte für hoch- und niedrigviskose Medien notwendig werden lassen, eine Beeinflussung des Pumpenantriebs herbeizuführen. Unter Beeinflussung des Pumpenantriebs ist dessen sofortiges Abschalten bis hin zur Drehzahlreduzierung oder Drehrichtungsumkehr zu verstehen.It has been shown that the increase in the medium temperature by already a few degrees Celsius can be an indicator of dry running can. A comparison is therefore made to determine an increase in temperature the temperature of the medium in the inlet area of the pump, which is the supply pipe or the inlet housing of the pump itself can, with the area of the pump itself, the actual rotor / stator area. Already increasing the temperature of the medium by it can have a value of approx. 5 ° C or a difference of 10 ° C empirically determined values for high and low viscosity media influence the pump drive bring about. It is under the influence of the pump drive immediate shutdown to speed reduction or Understand reversal of direction of rotation.
Bei hochviskosen Medien, wie beispielsweise bei der Schlammförderung, wird die steigende Temperaturdifferenz, hervorgehend aus dem ansteigenden Gegendruck und damit erhöhter Reibung, im Rotor-/Statorbereich genutzt, um über die beispielsweise verwendeten Differenztemperaturregler ein Gleitmittel (Flockungsmittel) ständig oder über eine bestimmte Dauer einzuspeisen. Diese zusätzliche Dosierung geschieht über beispielsweise eine oder mehrere Düsenanordnungen im Statorbereich oder im Einlaufgehäuse. With highly viscous media, such as sludge extraction, the increasing temperature difference, resulting from the increasing back pressure and thus increased friction in the rotor / stator area used to use the example Differential temperature controller a lubricant (flocculant) constantly or feed in over a certain duration. This additional dosage happens via, for example, one or more nozzle arrangements in the Stator area or in the inlet housing.
Die Zeitdauer der Dosierung wird abhängig sein von den Parametern (Zeitdauer der anstehenden Temperaturdifferenz, Höhe der Differenz) der ermittelten Temperaturdifferenz. Zahlreiche zum Teil erfinderische Ausgestaltungen ergeben sich aus den Unteransprüchen.The duration of the dosing will depend on the parameters (Duration of the pending temperature difference, amount of the difference) determined temperature difference. Numerous, partly inventive Refinements result from the subclaims.
Weitere Vorteile und Einzelheiten der Erfindung sind erkennbar aus der nachfolgenden Beschreibung zu Fig. 1.Further advantages and details of the invention can be seen from the the following description of FIG. 1.
Die in Fig. 1 dargestellte Pumpenanordnung besteht aus einer
Exzenterschneckenpumpe 10 mit einem Stator 12 und einem exzentrisch
um dessen Längsachse umlaufenden schneckenförmigen Rotor 14.
Druckseitig schließt sich dem Stator 12 eine Rohrleitung 16 an, um das
geförderte Medium weiteren Be- oder Verarbeitungsstellen zuzuführen.
Saugseitig, also rechts vom Stator, befindet sich das Einlaßgehäuse 18, in
dem die Antriebsverbindungen zwischen dem Rotor 14 und dem Antrieb
20 untergebracht sind. Zum Ausgleich der Exzentrizität des Rotors
gegenüber der Antriebswelle des Antriebs sind entsprechende
Gelenkverbindungen oder sogenannte Biegestäbe eingesetzt.The pump arrangement shown in Fig. 1 consists of a
Zur Unterstützung der Zuförderung des Mediums in die Pumpe können im
Einlaufgehäuse zusätzliche Förderer (Schnecken oder Schaufeln)
vorgesehen sein. Dem Stutzen 22 kann zum Einbringen des Mediums eine
Rohrleitung oder ein Trichter oder entsprechende Dosiervorrichtungen
zugeordnet sein.To support the delivery of the medium in the pump can in
Inlet housing additional conveyors (screws or shovels)
be provided. The
Zwischen dem in der Regel mit elastischem Material ausgekleideten Stator
12 und dem aus starrem Material gefertigten Rotor 14 entsteht durch die
Rotation des exzentrisch gelagerten Rotors Wärme, die ohne
Fördermedium zur Überhitzung und damit zum Stillstand und der
Zerstörung der Pumpe 10 bzw. dem Antrieb 20 führen können.Between the stator, usually lined with
Ein, wie im Ausführungsbeispiel dargestellt, oder mehrere im oder am
Stator 12 befestigte Temperaturfühler 24 messen die Temperatur an der
inneren Oberfläche des Stators und damit die Temperatur des geförderten
Mediums. Ein weiterer Temperaturfühler 26 außerhalb des Rotor-/Statorbereichs
der Pumpe im Einlaufgehäuse 18 oder Zulaufbereich mißt
die Eingangstemperatur des Mediums. Beide im Ausführungsbeispiel dargestellten
Temperaturfühler 24, 26 sind mit einem Temperaturregler,
beispielsweise einem Differenztemperaturregler 28 über Leitungen 30,
32 verbunden. Der Differenztemperaturzregler 28 steht direkt über ein
Leistungsteil über die Leitung 34 mit dem Antrieb 20 in Verbindung.
Die Betriebsweise des Differenztemperaturreglers 28 ist in Fig. 1 so
gewählt, daß man bei Erreichen einer bestimmten Temperaturdifferenz
zwischen den Temperaturfühlern 24, 26 den Antrieb abschaltet, die
Drehzahl regelt oder die Drehrichtung kurzzeitig umkehrt und abschaltet
oder wieder umkehrt.One, as shown in the exemplary embodiment, or more in or on
Vorteil dieser von der Mediumstemperatur abhängigen Regelung ist, daß selbst bei sehr geringen Temperaturen weitab von der Temperaturbelastungsgrenze der Pumpenmaterialien ein Trockenlauf der Pumpe mit den vorgenannten Möglichkeiten verhindert wird. Zur exakten Auswertung der Temperaturdifferenz beim Einsatz langer Pumpen können deshalb mehrere Temperaturfühler über die gesamte Länge des Stators verteilt sein.The advantage of this regulation, which is dependent on the medium temperature, is that even at very low temperatures far from the temperature limit of the pump materials a dry running of the pump with the the aforementioned possibilities is prevented. For exact evaluation the temperature difference when using long pumps can therefore several temperature sensors distributed over the entire length of the stator his.
Selbstverständlich läßt die Steuerungsvielfalt des Temperaturdifferentialreglers alle vorgenannten Kombinationen von Zudosierung und Betriebsweise des Antriebs zu.Of course, the variety of controls the temperature differential controller leaves all of the aforementioned combinations of metering and Operating mode of the drive too.
Schließlich soll noch erwähnt werden, daß die Reduzierung der Fördermenge durch die Ansteuerung des Antriebs über einen Frequenzumrichter oder einen polumschaltbaren Pumpenmotor erzielt werden kann.Finally, it should be mentioned that the reduction in the delivery rate by controlling the drive via a frequency converter or a pole-changing pump motor can be achieved.
Die Einstellung und die visuelle Anzeige einer höchstzulässigen Temperatur
oder Differenztemperatur läßt sich über das Eingabefeld 36
des Temperaturdifferenzregler 28 mit der Anzeige 38 bewerkstelligen.The setting and visual display of a maximum allowable temperature
or differential temperature can be entered via the
Claims (6)
- Method of controlling screw-type pumps (10) as a function of the temperature, by measuring the temperature of the delivered medium in the region of the stator (12) in one out of the operating steps,
characterised in that
in further operating steps the temperature of the conveyed medium is measured in the intake housing (18) of the screw-type pump (10) or in the pipe on the suction side ahead of the screw-type pump (10), in that the difference of temperature between these two temperatures is established and in that the screw-type pump (10) is controlled on the basis of this temperature difference, relative to a previously defined tolerance value. - Method according to Claim 1,
characterised in that
the screw-type pump (10) is stopped if the temperature of the medium delivered in the screw-type pump (10) is increased by 10 % relative to the temperature in the intake region. - Method according to Claim 1,
characterised in that
the screw-type pump (10) is stopped if the temperature of the medium delivered in the screw-type pump (10) exceeds, by 5 °C, the temperature in said intake housing (18) of the screw-type pump or the temperature in the pipe on the suction side ahead of the screw-type pump (10). - Device for carrying out the method according to any of the Claims 1 to 3 for screw-type pumps (10), comprising at least a thermo sensitive element disposed in the region of the stator, and a controller creating its influence on the operation of the screw-type pump as soon as settable temperature values are reached,
characterised in that
a second thermo sensitive element (26) in said intake housing (18) of the screw-type pump (10) or in the pipe on the suction side ahead of the screw-type pump (10) is associated with the screw-type pump (10), this second sensor, like the thermo sensitive element disposed in the region of the stator, being connected to a differential thermostat controller (28). - Device according to Claim 4,
characterised in that
said second thermo sensitive element (26) is arranged on the suction side in said intake housing (18). - Device according to Claim 4,
characterised in that
said second thermo sensitive element (26) is arranged in the pipe on the suction side ahead of the screw-type pump (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19649766A DE19649766C1 (en) | 1996-11-30 | 1996-11-30 | Method of temperature-dependent operation of e.g. helical rotor type sludge pump |
| DE19649766 | 1996-11-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0845598A1 EP0845598A1 (en) | 1998-06-03 |
| EP0845598B1 true EP0845598B1 (en) | 2003-05-07 |
Family
ID=7813283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97120796A Expired - Lifetime EP0845598B1 (en) | 1996-11-30 | 1997-11-27 | Method and apparatus for temperature dependent operation of pumps with helical rotors |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0845598B1 (en) |
| DE (2) | DE19649766C1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10063953A1 (en) * | 2000-05-19 | 2002-02-07 | Netzsch Mohnopumpen Gmbh | Method and device for operating a screw pump |
| WO2001088379A1 (en) * | 2000-05-19 | 2001-11-22 | Netzsch-Mohnopumpen Gmbh | Method and device for operating a screw pump |
| DE10157143B4 (en) * | 2001-11-21 | 2007-01-11 | Netzsch-Mohnopumpen Gmbh | Maintenance interval display for pumps |
| DE10156927B4 (en) * | 2001-11-21 | 2006-06-08 | Netzsch-Mohnopumpen Gmbh | Pump controller with part identification |
| BE1015088A5 (en) * | 2002-09-03 | 2004-09-07 | Atlas Copco Airpower Nv | Improvements in compressors. |
| DE102004060418A1 (en) * | 2004-12-14 | 2006-07-06 | Metabowerke Gmbh | Pump with frost protection device |
| US7941906B2 (en) * | 2007-12-31 | 2011-05-17 | Schlumberger Technology Corporation | Progressive cavity apparatus with transducer and methods of forming and use |
| WO2013049030A1 (en) * | 2011-09-30 | 2013-04-04 | Moyno, Inc. | Universal joint with cooling system |
| FR3009038B1 (en) * | 2013-07-26 | 2019-08-30 | Akwel | ELECTRONIC MANAGEMENT OF AN ICEWASH PUMP |
| DE102020111386A1 (en) | 2020-04-27 | 2021-10-28 | Vogelsang Gmbh & Co. Kg | Condition detection on eccentric screw pumps |
| DE102020123120A1 (en) * | 2020-09-04 | 2022-03-10 | J. Wagner Gmbh | Operating method for a conveying device with an eccentric screw pump for conveying viscous building materials |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2518597A (en) * | 1945-06-20 | 1950-08-15 | Niagara Alkali Company | Pumping apparatus |
| US2940395A (en) * | 1956-01-20 | 1960-06-14 | Perfect Circle Corp | Control means for pumping apparatus |
| DE2311770C3 (en) * | 1973-03-09 | 1983-05-05 | Kreissparkasse Recklinghausen, 4350 Recklinghausen | Temperature monitoring device for eccentric screw pumps |
-
1996
- 1996-11-30 DE DE19649766A patent/DE19649766C1/en not_active Expired - Fee Related
-
1997
- 1997-11-27 EP EP97120796A patent/EP0845598B1/en not_active Expired - Lifetime
- 1997-11-27 DE DE59710030T patent/DE59710030D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0845598A1 (en) | 1998-06-03 |
| DE19649766C1 (en) | 1998-04-09 |
| DE59710030D1 (en) | 2003-06-12 |
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