EP0845598A1 - 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
- EP0845598A1 EP0845598A1 EP97120796A EP97120796A EP0845598A1 EP 0845598 A1 EP0845598 A1 EP 0845598A1 EP 97120796 A EP97120796 A EP 97120796A EP 97120796 A EP97120796 A EP 97120796A EP 0845598 A1 EP0845598 A1 EP 0845598A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- temperature
- stator
- area
- temperature sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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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.
- the Eccentric screw pump has one in the stator part of the pump Temperature sensor, the measuring tip in or near the inner Surface of the stator sits.
- the temperature sensor stands with one Control device in connection, which when a predetermined Temperature responds and the drive of the rotor via servo motor or Regulating gear regulates or stops.
- the control unit responds to the temperature prevailing on the stator surface, of course Tolerance values can be taken into account.
- 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 that points to the different Temperatures during the oil production operation reacts. There is a possibility of driving the drive when a certain one is reached Stop the maximum temperature at the stator and after the pump cools down start again at a lower temperature value.
- the invention has for its object a method and an apparatus to create, causing the dry running of pumps with helical Rotors far below due to the evaluation of temperatures 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. She will continue to 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 dosage 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.
- 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 Articulated 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 permissible 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)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum temperaturabhängigen Betreiben von Schneckenpumpen.The invention relates to a method and an apparatus for temperature-dependent operation of screw pumps.
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, the measuring tip in or near the inner Surface of the stator sits. The temperature sensor stands with one Control device in connection, which when a predetermined Temperature responds and the drive of the rotor via servo motor or Regulating gear regulates or stops. Especially with stators with heat-sensitive materials, it has proven to be advantageous proven, especially the surface temperature of the stator monitor because of the direct friction between the 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 several temperature sensors can be distributed over the stator length for 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 Exceed the temperature that is not conducive to the stator from immediate shutdown to speed control to the supply of Lubricants.
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, dem 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 that points to the different Temperatures during the oil production operation reacts. There is a possibility of driving the drive when a certain one is reached Stop the maximum temperature at the stator and after the pump cools 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 umterhalb kritischer Materialbelastungstemperaturen möglich ist.The invention has for its object a method and an apparatus to create, causing the dry running of pumps with helical Rotors far below due to the evaluation of temperatures 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 im 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. She will continue to 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 vom 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 the occurrence 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. For 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 for example Differential temperature controller a lubricant (flocculant) constantly or feed in over a certain period. 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 dosage 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 im Fig. 1 so
gewählt, daß man bei Erreichen einer bestimmten Temperaturdifferenz
zwischen dem 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 several in or on
Vorteil dieser vom der Mediumstemperatur abhängigen Regelung ist, daß selbst bei sehr geringen Temperaturen weitab von der Temperaturbelastumgsgrenze 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 control, 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 be.
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 einem 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 höchst zulässigen 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 permissible temperature
or differential temperature can be entered via the
Claims (6)
dadurch gekennzeichnet,
daß 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.Process for the temperature-dependent operation of screw pumps,
characterized by
that the temperature of the pumped medium is measured in the inlet area of the pump and in the pump itself, that the temperature difference between these two temperatures is determined and that the pump is regulated on the basis of this determined temperature difference in comparison with a predetermined tolerance value.
dadurch gekennzeichnet,
daß die Pumpe abgeschaltet wird, sofern die Temperatur des geförderten Mediums in der Pumpe um über 10 % gegenüber der Temperatur im Einlaßbereich ansteigt.Method according to claim 1,
characterized by
that the pump is switched off if the temperature of the pumped medium in the pump rises by more than 10% compared to the temperature in the inlet area.
dadurch gekennzeichnet,
daß die Pumpe abgeschaltet wird, sofern die Temperatur des geförderten Mediums in der Pumpe um 5 °C größer ist als im Einlaßbereich der Pumpe.Method according to claim 1,
characterized by
that the pump is switched off if the temperature of the pumped medium in the pump is 5 ° C higher than in the inlet area of the pump.
dadurch gekennzeichnet,
daß der Pumpe ein zweiter Temperaturfühler (26) im Einlaßbereich vor dem Rotor-/Statorbereich zugeordnet ist, der ebenso wie der im Statorbereich angeordnete Temperaturfühler mit einem Differenztemperaturregler (28) in Verbindung steht. Device for carrying out the method according to one of claims 1 to 3 for screw pumps with at least one temperature sensor arranged in the stator area and a control device which influences the pump operation when adjustable temperature values are reached,
characterized by
that the pump is assigned a second temperature sensor (26) in the inlet area in front of the rotor / stator area, which, like the temperature sensor arranged in the stator area, is connected to a differential temperature controller (28).
dadurch gekennzeichnet,
daß der zweite Temperaturfühler (26) saugseitig im Einlaufgehäuse (18) angeordnet ist.Device make claim 4,
characterized by
that the second temperature sensor (26) is arranged on the suction side in the inlet housing (18).
dadurch gekennzeichnet,
daß der Temperaturfühler (26) im der saugseitigen Rohrleitung vor der Pumpe angeordnet ist.Device according to claim 4,
characterized by
that the temperature sensor (26) is arranged in the suction pipe before the pump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19649766 | 1996-11-30 | ||
| DE19649766A DE19649766C1 (en) | 1996-11-30 | 1996-11-30 | Method of temperature-dependent operation of e.g. helical rotor type sludge pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0845598A1 true EP0845598A1 (en) | 1998-06-03 |
| EP0845598B1 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100730976B1 (en) * | 2002-09-03 | 2007-06-22 | 아틀라스 캅코 에어파워, 남로체 벤누트삽 | Speed control for compressors |
| WO2013049030A1 (en) * | 2011-09-30 | 2013-04-04 | Moyno, Inc. | Universal joint with cooling system |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001088379A1 (en) * | 2000-05-19 | 2001-11-22 | Netzsch-Mohnopumpen Gmbh | Method and device for operating a screw pump |
| DE10063953A1 (en) * | 2000-05-19 | 2002-02-07 | 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 |
| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2518597A (en) * | 1945-06-20 | 1950-08-15 | Niagara Alkali Company | Pumping apparatus |
| DE2311770A1 (en) * | 1973-03-09 | 1974-09-19 | Seeberger Gmbh & Co Kg F | PROCEDURE AND ARRANGEMENT FOR MONITORING THE OPERATION OF ECCENTRIC SCREW PUMPS |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2940395A (en) * | 1956-01-20 | 1960-06-14 | Perfect Circle Corp | Control means for pumping apparatus |
-
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
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2518597A (en) * | 1945-06-20 | 1950-08-15 | Niagara Alkali Company | Pumping apparatus |
| DE2311770A1 (en) * | 1973-03-09 | 1974-09-19 | Seeberger Gmbh & Co Kg F | PROCEDURE AND ARRANGEMENT FOR MONITORING THE OPERATION OF ECCENTRIC SCREW PUMPS |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100730976B1 (en) * | 2002-09-03 | 2007-06-22 | 아틀라스 캅코 에어파워, 남로체 벤누트삽 | Speed control for compressors |
| WO2013049030A1 (en) * | 2011-09-30 | 2013-04-04 | Moyno, Inc. | Universal joint with cooling system |
| US9435383B2 (en) | 2011-09-30 | 2016-09-06 | Moyno, Inc. | Universal joint with cooling system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59710030D1 (en) | 2003-06-12 |
| DE19649766C1 (en) | 1998-04-09 |
| EP0845598B1 (en) | 2003-05-07 |
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