EP0822336A2 - Method for stabilizing the temperature of gear pumps - Google Patents

Method for stabilizing the temperature of gear pumps Download PDF

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Publication number
EP0822336A2
EP0822336A2 EP97119483A EP97119483A EP0822336A2 EP 0822336 A2 EP0822336 A2 EP 0822336A2 EP 97119483 A EP97119483 A EP 97119483A EP 97119483 A EP97119483 A EP 97119483A EP 0822336 A2 EP0822336 A2 EP 0822336A2
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EP
European Patent Office
Prior art keywords
housing part
temperature
shafts
medium
temperature control
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
Application number
EP97119483A
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German (de)
French (fr)
Other versions
EP0822336B1 (en
EP0822336A3 (en
Inventor
Stefan Kalt
Michael Heinen
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.)
Maag Pump Systems AG
Original Assignee
Maag Pump Systems AG
Maag Pump Systems Textron AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maag Pump Systems AG, Maag Pump Systems Textron AG filed Critical Maag Pump Systems AG
Priority to DE59709888T priority Critical patent/DE59709888D1/en
Priority to EP97119483A priority patent/EP0822336B1/en
Priority to AT97119483T priority patent/ATE238495T1/en
Publication of EP0822336A2 publication Critical patent/EP0822336A2/en
Publication of EP0822336A3 publication Critical patent/EP0822336A3/en
Priority to US09/188,175 priority patent/US6280164B1/en
Application granted granted Critical
Publication of EP0822336B1 publication Critical patent/EP0822336B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling

Definitions

  • the present invention relates to a method according to the Preamble of claim 1.
  • Gear pump lubricated for the conveyance of materials The temperature of the material being conveyed is higher for polymers This is important because the viscosity increases when the temperature is too low is high and at too high a temperature Decomposition phenomena can occur. Therefore tries the temperature of the fluid in one to hold certain area. This enables that the operating window of the gear pump is considerable can be expanded.
  • the Gear pump and in the shaft in a known manner Heat exchanger provided, the heat exchanger in Housing via a first line system to a heating unit and the heat exchanger in the shaft via a second one Line system are connected to a cooling device.
  • the heating unit is the housing that is in operation at the Environment emits heat at a predetermined temperature held.
  • the cooling unit the friction created and released between shaft and bearing Energy compensates, which causes local overheating of the Goods to be conveyed should be avoided.
  • the present invention is therefore based on the object based on specifying a method mentioned above Does not have disadvantages.
  • the invention has the following advantages: Stabilization of temperature in gear pumps Temperature control unit is used, both on the Heat exchanger in the shaft and / or in the plain bearing as well is connected to the heat exchanger in the housing the system considerably simplified, which is particularly evident in manifested lower costs.
  • Fig. 1 shows - in a schematic representation - a known System for stabilizing the temperature of one with one Gear pump conveyed material.
  • the gear pump consists of at least one housing part G in which in particular two waves W are contained, each at least in one, preferably in two plain bearings L. are rotatably mounted.
  • the Structure of gear pumps is, for example, based on the Maag paperback, 2nd edition, 1985, pages 279 ff.
  • gear pumps are particularly suitable for pumping highly viscous liquids such as for example of polymer melts. It is about make sure that the temperature of the material being conveyed is as possible stably corresponds to a certain value at which neither Decomposition - which occurs when the temperature is too high - still a blockage of the gear pump - e.g. by fixing the plain bearing - enter through a viscous product can what happens when the temperature of the material being conveyed is too low is possible.
  • each with supply systems ZS1 and ZS2 Temperature control units T1 and T2 are connected. In the Temperature control units T1 and T2 become a medium M on one desired temperature heated or cooled and with With the help of the ZS1 and ZS2 supply systems to the heat exchanger supplied in the shaft W or in the housing G.
  • the known system has the disadvantage that for the separate supply systems ZS1 and ZS2 also two Temperature control units T1 and T2 must be provided.
  • the advantage the independent temperature setting for shaft W and Housing G are extremely expensive Temperature control units T1 and T2 opposite.
  • FIG. 2 to 4 are various according to the invention Devices for adjusting and stabilizing the Temperature of the material to be conveyed M is shown. All point three versions a single temperature control unit TA to which the supply system ZS to the heat exchangers in the housing G or in the shaft W in different ways are connected. So is a system in Fig. 2 shown, in which the heat exchanger parallel to the Temperature control unit TA are connected, i.e. that the Medium M in the supply system ZS before corresponding heat exchanger the same temperature having.
  • the embodiment according to FIG. 3 a parallel connection of the heat exchangers. Indeed is done here by merging the lines in front of the Heat exchangers a mix and therefore a Temperature compensation of the media M in front of the temperature control unit TA.
  • Fig. 4 is an embodiment shown in a series connection of the two Heat exchanger is provided, because first the medium M - starting from the temperature control unit TA - through the Heat exchanger in the shaft and then through the Heat exchanger in housing G out.
  • the waste heat generated in the wave W by the medium M is transported into the housing G, i.e. Shaft W and housing G act like a temperature control unit.

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

Abstract

The system is for a gear pump lubricated by the medium delivered. A housing (G) contains two or more plain bearings (L) for lubricated spindles (W). A medium (M) is brought to a predetermined temperature in a control unit (TA). The medium is fed to one or more housing sections, and to the spindles and/or bearings, and the flow through them can take place in parallel. Alternatively, the spindles and bearings can be lubricated first, after which the medium flows through the housing section.

Description

Die vorliegende Erfindung betrifft ein Verfahren nach dem Oberbegriff des Patentanspruchs 1.The present invention relates to a method according to the Preamble of claim 1.

Bei der Verwendung von gleitgelagerten, fördergutgeschmierten Zahnradpumpen zur Förderung von Polymeren ist die Temperatur des Fördergutes von grosser Bedeutung, da bei zu tiefer Temperatur die Viskosität zu hoch ist und bei zu hoher Temperatur Zersetzungserscheinungen auftreten können. Daher wird versucht, die Temperatur des Fördermediums in einem bestimmten Bereich zu halten. Dadurch wird es ermöglicht, dass das Betriebsfenster der Zahnradpumpe erheblich erweitert werden kann.When using plain bearings, Gear pump lubricated for the conveyance of materials The temperature of the material being conveyed is higher for polymers This is important because the viscosity increases when the temperature is too low is high and at too high a temperature Decomposition phenomena can occur. Therefore tries the temperature of the fluid in one to hold certain area. This enables that the operating window of the gear pump is considerable can be expanded.

Zur Temperaturstabilisierung werden deshalb im Gehäuse der Zahnradpumpe und in der Welle in bekannter Weise Wärmetauscher vorgesehen, wobei der Wärmetauscher im Gehäuse über ein erstes Leitungssystem an ein Heizaggregat und der Wärmetauscher in der Welle über ein zweites Leitungssystem an ein Kühlgerät angeschlossen sind. Mit dem Heizaggregat wird das Gehäuse, das im Betrieb an die Umgebung Wärme abgibt, auf einer vorgegebenen Temperatur gehalten. Mit dem Kühlaggregat wird die durch Reibung zwischen Welle und Lager entstehende und frei werdende Energie kompensiert, womit eine lokale Überhitzung des Fördergutes vermieden werden soll. For temperature stabilization, the Gear pump and in the shaft in a known manner Heat exchanger provided, the heat exchanger in Housing via a first line system to a heating unit and the heat exchanger in the shaft via a second one Line system are connected to a cooling device. With the The heating unit is the housing that is in operation at the Environment emits heat at a predetermined temperature held. With the cooling unit, the friction created and released between shaft and bearing Energy compensates, which causes local overheating of the Goods to be conveyed should be avoided.

Das bekannte Verfahren zur Temperatureinstellung ist jedoch aufwendig und mit entsprechend hohen Kosten verbunden.However, the known method of temperature adjustment is complex and associated with correspondingly high costs.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren anzugeben, das obenerwähnte Nachteile nicht aufweist.The present invention is therefore based on the object based on specifying a method mentioned above Does not have disadvantages.

Diese Aufgabe wird durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Massnahmen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sowie eine Vorrichtung zur Durchführung des Verfahrens sind in weiteren Ansprüchen angegeben.This task is carried out in the characterizing part of the Measures specified claim 1 solved. Advantageous embodiments of the invention and one Devices for performing the method are in specified further claims.

Die Erfindung weist folgende Vorteile auf: Indem zur Stabilisierung der Temperatur in Zahnradpumpen ein Temperieraggregat verwendet wird, das sowohl an den Wärmetauscher in der Welle und/oder im Gleitlager als auch an den Wärmetauscher im Gehäuse angeschlossen wird, wird das System erheblich vereinfacht, was sich insbesondere in geringeren Kosten manifestiert.The invention has the following advantages: Stabilization of temperature in gear pumps Temperature control unit is used, both on the Heat exchanger in the shaft and / or in the plain bearing as well is connected to the heat exchanger in the housing the system considerably simplified, which is particularly evident in manifested lower costs.

Die Erfindung wird nachfolgend anhand von Zeichnungen beispielsweise näher erläutert. Dabei zeigen

Fig. 1
in schematischer Darstellung ein bekanntes System zur Stabilisierung der Temperatur des Fördergutes mit zwei Temperieraggregaten und
Fig. 2 bis 4
in schematischer Darstellung verschiedene erfindungsgemässe Systeme zur Stabilisierung der Temperatur des Fördergutes mit einem Temperieraggregat.
The invention is explained in more detail below using drawings, for example. Show
Fig. 1
in a schematic representation of a known system for stabilizing the temperature of the material to be conveyed with two temperature control units and
2 to 4
a schematic representation of various systems according to the invention for stabilizing the temperature of the conveyed material with a temperature control unit.

Fig. 1 zeigt - in schematischer Darstellung - ein bekanntes System zur Stabilisierung der Temperatur eines mit einer Zahnradpumpe geförderten Fördergutes. Die Zahnradpumpe besteht dabei aus mindestens einem Gehäuseteil G, in dem insbesondere zwei Wellen W enthalten sind, die je mindestens in einem, vorzugsweise in zwei Gleitlagern L drehbar gelagert sind. Für weiterführende Angaben zum Aufbau von Zahnradpumpen sei beispielsweise auf das Maag-Taschenbuch, 2. Auflage, 1985, Seiten 279 ff. verwiesen.Fig. 1 shows - in a schematic representation - a known System for stabilizing the temperature of one with one Gear pump conveyed material. The gear pump consists of at least one housing part G in which in particular two waves W are contained, each at least in one, preferably in two plain bearings L. are rotatably mounted. For further information on the Structure of gear pumps is, for example, based on the Maag paperback, 2nd edition, 1985, pages 279 ff.

Wie eingangs erwähnt, eignen sich Zahnradpumpen besonders zur Förderung von hochviskosen Flüssigkeiten wie beispielsweise von Polymerschmelzen. Dabei ist darauf zu achten, dass die Temperatur des Fördergutes möglichst stabil einem bestimmten Wert entspricht, bei dem weder eine Zersetzung - was bei zu hohen Temperaturen vorkommt - noch eine Blockierung der Zahnradpumpe - z.B. durch Festsetzen der Gleitlager - durch ein zähflüssiges Fördergut eintreten kann, was bei zu tiefen Temperaturen des Fördergutes möglich ist. Dazu wurden in bekannter Weise im Gehäuse G und in der Welle W der Zahnradpumpe Wärmetauscher vorgesehen, die über Zuleitungssysteme ZS1 und ZS2 je mit Temperieraggregaten T1 und T2 verbunden sind. In den Temperieraggregaten T1 und T2 wird ein Medium M auf eine gewünschten Temperatur aufgeheizt bzw. abgekühlt und mit Hilfe der Zuleitungssystemen ZS1 und ZS2 dem Wärmetauscher in der Welle W bzw. im Gehäuse G zugeführt.As mentioned at the beginning, gear pumps are particularly suitable for pumping highly viscous liquids such as for example of polymer melts. It is about make sure that the temperature of the material being conveyed is as possible stably corresponds to a certain value at which neither Decomposition - which occurs when the temperature is too high - still a blockage of the gear pump - e.g. by fixing the plain bearing - enter through a viscous product can what happens when the temperature of the material being conveyed is too low is possible. For this purpose, in a known manner in the housing G and in the shaft W of the gear pump heat exchanger provided that each with supply systems ZS1 and ZS2 Temperature control units T1 and T2 are connected. In the Temperature control units T1 and T2 become a medium M on one desired temperature heated or cooled and with With the help of the ZS1 and ZS2 supply systems to the heat exchanger supplied in the shaft W or in the housing G.

Das bekannte System hat den Nachteil, dass für die getrennten Zuleitungssysteme ZS1 und ZS2 auch zwei Temperieraggregate T1 und T2 vorzusehen sind. Dem Vorteil der unabhängigen Temperatureinstellung für Welle W und Gehäuse G stehen ungemein hohe Kosten für die Temperieraggregate T1 und T2 gegenüber.The known system has the disadvantage that for the separate supply systems ZS1 and ZS2 also two Temperature control units T1 and T2 must be provided. The advantage the independent temperature setting for shaft W and Housing G are extremely expensive Temperature control units T1 and T2 opposite.

In den Fig. 2 bis 4 sind verschiedene erfindungsgemässe Vorrichtungen zur Einstellung und Stabilisierung der Temperatur des Fördergutes M dargestellt. Dabei weisen alle drei Ausführungsvarianten ein einziges Temperieraggregat TA auf, an das die Zuleitungssysteme ZS zu den Wärmetauschern im Gehäuse G oder in der Welle W auf verschiedene Weise angeschlossen sind. So ist in Fig. 2 ein System dargestellt, bei dem die Wärmetauscher parallel an das Temperieraggregat TA angeschlossen sind, d.h., dass das Medium M in den Zuleitungssystemen ZS vor dem entsprechenden Wärmetauscher die gleiche Temperatur aufweist.2 to 4 are various according to the invention Devices for adjusting and stabilizing the Temperature of the material to be conveyed M is shown. All point three versions a single temperature control unit TA to which the supply system ZS to the heat exchangers in the housing G or in the shaft W in different ways are connected. So is a system in Fig. 2 shown, in which the heat exchanger parallel to the Temperature control unit TA are connected, i.e. that the Medium M in the supply system ZS before corresponding heat exchanger the same temperature having.

In gleicher Weise ist auch die Ausführungsform gemäss Fig. 3 eine Parallelschaltung der Wärmetauscher. Allerdings erfolgt hier durch ein Zusammenführen der Leitungen vor den Warmetauschern eine Durchmischung und mithin ein Temperaturausgleich der Medien M vor dem Temperieraggregat TA. The embodiment according to FIG. 3 a parallel connection of the heat exchangers. Indeed is done here by merging the lines in front of the Heat exchangers a mix and therefore a Temperature compensation of the media M in front of the temperature control unit TA.

Schliesslich ist in Fig. 4 eine Ausführungsform dargestellt, bei der eine Serieschaltung der beiden Wärmetauscher vorgesehen ist, denn zunächst wird das Medium M - ausgehend vom Temperieraggregat TA - durch den Wärmetauscher in der Welle und anschliessend durch den Wärmeaustauscher im Gehäuse G geführt. Bei dieser Ausführungsform wird im speziellen die Möglichkeit ausgenutzt, dass die in der Welle W erzeugte Abwärme durch das Medium M in das Gehäuse G transportiert wird, d.h. Welle W und Gehäuse G agieren wie ein Temperieraggregat.Finally, in Fig. 4 is an embodiment shown in a series connection of the two Heat exchanger is provided, because first the medium M - starting from the temperature control unit TA - through the Heat exchanger in the shaft and then through the Heat exchanger in housing G out. At this Embodiment will be the possibility in particular exploited that the waste heat generated in the wave W by the medium M is transported into the housing G, i.e. Shaft W and housing G act like a temperature control unit.

Es wird darauf hingewiesen, dass in einer weiteren Ausführungsform der Erfindung anstelle des Wärmeaustauschers in der Welle W auch ein entsprechender Wärmeaustauscher im Gleitlager L verwendet wird, um eine Überhitzung zu vermeiden. Darüber hinaus besteht die Möglichkeit, auch die Kombination von Wärmeaustauschern in der Welle W und im Gleitlager L gleichzeitig vorzusehen.It should be noted that in another Embodiment of the invention instead of the Heat exchanger in the shaft W also a corresponding one Heat exchanger used in the plain bearing L to a Avoid overheating. In addition, there is Possibility of combining heat exchangers in the shaft W and in the plain bearing L at the same time.

Claims (8)

Verfahren zur Stabilisierung der Temperatur bei einer mit Fördergut geschmierten Zahnradpumpe, bestehend aus mindestens einem Gehäuseteil (G) mit mindestens zwei Gleitlagern (L), in denen Wellen (W) Fördermedium geschmiert gelagert sind, wobei das Verfahren darin besteht, dass ein Medium (M) in einem Temperieraggregat (TA) auf einen vorbestimmten Temperaturwert eingestellt wird, dass das Medium (M) einerseits den mindestens einen Gehäuseteil (G) und anderseits die Wellen (W) und/oder die Gleitlager (L) zum Zwecke der Stabilisierung der Temperatur durchströmt. Method for stabilizing the temperature in a gear pump lubricated with material to be conveyed, consisting of at least one housing part (G) with at least two slide bearings (L), in which shafts (W) conveyed medium are lubricated, the method consisting in that a medium (M) in a temperature control unit (TA) is set to a predetermined temperature value, that the medium (M) on the one hand flows through the at least one housing part (G) and on the other hand through the shafts (W) and / or the plain bearings (L) for the purpose of stabilizing the temperature. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das mindestens eine Gehäuseteil (G), die Wellen (W) und/oder die Gleitlager (L) vom Medium (M) parallel durchströmt werden.A method according to claim 1, characterized in that the at least one housing part (G), the shafts (W) and / or the slide bearing (L) from the medium (M) in parallel be flowed through. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das mindestens eine Gehäuseteil (G) und die Wellen (W) bzw. die Gleitlager (L) vom Medium (M) unabhängig voneinander durchströmt werden.A method according to claim 2, characterized in that the at least one housing part (G) and the shafts (W) or the plain bearings (L) independently of each other from the medium (M) be flowed through. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ausgehend vom Temperieraggregat (TA) zunächst die Wellen (W) und/oder die Gleitlager (L) und danach das mindestens eine Gehäuseteil (G) vom Medium (M) durchflossen werden.A method according to claim 1, characterized in that starting from the temperature control unit (TA), the waves first (W) and / or the plain bearing (L) and after that at least medium (M) flows through a housing part (G). Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 4, wobei die Vorrichtung aus einer Zahnradpumpe mit mindestens einem Gehäuseteil (G), mindestens zwei Wellen (W) und mindestens zwei Gleitlagern (L) besteht, dadurch gekennzeichnet, dass das mindestens eine Gehäuseteil (G), die Wellen (W) und/oder die Gleitlager (L) Leitungssysteme zum Austauschen von Wärme aufweisen und dass ein Temperieraggregat (TA) vorgesehen ist, das über mindestens ein Zuleitungssystem (ZS) mit den Leitungssystemen verbindbar ist.Device for performing the method according to a of claims 1 to 4, wherein the device from a Gear pump with at least one housing part (G), at least two shafts (W) and at least two plain bearings (L), characterized in that the at least a housing part (G), the shafts (W) and / or the Plain bearing (L) pipe systems for exchanging heat have and that a temperature control unit (TA) is provided is that with at least one supply system (ZS) Line systems is connectable. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Leitungssystem durch den mindestens einen Gehäuseteil (G) und das Leitungssystem durch die Wellen (W) und/oder durch die Gleitlager (L) parallel geschaltet an das Zuleitungssystem (ZS) angeschlossen sind.Device according to claim 5, characterized in that the piping system by the at least one Housing part (G) and the pipe system through the shafts (W) and / or connected in parallel by the slide bearing (L) the supply system (ZS) are connected. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass das Leitungssystem durch den mindestens einen Gehäuseteil (G) und das Leitungssystem durch die Wellen (W) und/oder durch die Gleitlager (L) je an einen Ausgang des Temperieraggregates (TA) angeschlossen sind.Apparatus according to claim 6, characterized in that the piping system by the at least one Housing part (G) and the pipe system through the shafts (W) and / or through the slide bearing (L) each to an output of the Temperature control units (TA) are connected. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Leitungssystem durch den mindestens einen Gehäuseteil (G) und das Leitungssystem (LS) durch die Wellen (W) und/oder durch die Gleitlager (L) in Serie geschaltet an das Zuleitungssystems (ZS) angeschlossen sind.Device according to claim 5, characterized in that the piping system by the at least one Housing part (G) and the pipe system (LS) through the Shafts (W) and / or through the plain bearings (L) in series connected to the supply system (ZS) are.
EP97119483A 1997-11-07 1997-11-07 Method for stabilizing the temperature of gear pumps Expired - Lifetime EP0822336B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE59709888T DE59709888D1 (en) 1997-11-07 1997-11-07 Process for temperature stabilization in gear pumps
EP97119483A EP0822336B1 (en) 1997-11-07 1997-11-07 Method for stabilizing the temperature of gear pumps
AT97119483T ATE238495T1 (en) 1997-11-07 1997-11-07 METHOD FOR TEMPERATURE STABILIZATION IN GEAR PUMPS
US09/188,175 US6280164B1 (en) 1997-11-07 1998-11-09 Method and apparatus for temperature stabilization in gear pumps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97119483A EP0822336B1 (en) 1997-11-07 1997-11-07 Method for stabilizing the temperature of gear pumps

Publications (3)

Publication Number Publication Date
EP0822336A2 true EP0822336A2 (en) 1998-02-04
EP0822336A3 EP0822336A3 (en) 1998-05-20
EP0822336B1 EP0822336B1 (en) 2003-04-23

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US (1) US6280164B1 (en)
EP (1) EP0822336B1 (en)
AT (1) ATE238495T1 (en)
DE (1) DE59709888D1 (en)

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EP1249608A1 (en) 2001-10-24 2002-10-16 Maag Pump Systems Textron AG Device, like an extrusion machine, comprising a direct driven gear pump
EP1270946A2 (en) 2002-09-17 2003-01-02 Maag Pump Systems Textron AG Device, like an extrusion machine, comprising a direct driven gear pump
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001033080A1 (en) * 1999-11-04 2001-05-10 Alceru Schwarza Gmbh Method and device for conveying a cellulose solution
EP1249608A1 (en) 2001-10-24 2002-10-16 Maag Pump Systems Textron AG Device, like an extrusion machine, comprising a direct driven gear pump
EP1270946A2 (en) 2002-09-17 2003-01-02 Maag Pump Systems Textron AG Device, like an extrusion machine, comprising a direct driven gear pump
EP1270946A3 (en) * 2002-09-17 2003-04-09 Maag Pump Systems Textron AG Device, like an extrusion machine, comprising a direct driven gear pump
WO2006087208A1 (en) * 2005-02-19 2006-08-24 Saurer Gmbh & Co. Kg Gear pump
DE102006033028A1 (en) * 2006-07-17 2008-01-24 Vmi - Az Extrusion Gmbh Extruder-gear pump combination, especially for forming tire tread strips, includes cooling channel switchable between higher and lower temperature supplies of coolant

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DE59709888D1 (en) 2003-05-28
US6280164B1 (en) 2001-08-28
EP0822336B1 (en) 2003-04-23
ATE238495T1 (en) 2003-05-15
EP0822336A3 (en) 1998-05-20

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