EP0602357A1 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
EP0602357A1
EP0602357A1 EP93117448A EP93117448A EP0602357A1 EP 0602357 A1 EP0602357 A1 EP 0602357A1 EP 93117448 A EP93117448 A EP 93117448A EP 93117448 A EP93117448 A EP 93117448A EP 0602357 A1 EP0602357 A1 EP 0602357A1
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EP
European Patent Office
Prior art keywords
housing
labyrinth seal
gear pump
bearing
shaft
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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
EP93117448A
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German (de)
French (fr)
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EP0602357B1 (en
Inventor
Roger Stehr
Urs Boelsterli
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
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Maag Pump Systems AG
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Publication date
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Publication of EP0602357A1 publication Critical patent/EP0602357A1/en
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Publication of EP0602357B1 publication Critical patent/EP0602357B1/en
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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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps

Definitions

  • the present invention relates to a gear pump according to the preamble of claim 1. It is known in the case of gear pumps of the type mentioned to seal rotor shafts guided outwards from the housing by means of labyrinth seals.
  • a gear pump according to the invention is characterized by the characterizing features of claim 1.
  • the bearing of the shaft is arranged in a separate bearing section in the housing axially on the inside and the labyrinth seal connects axially to the bearing section, a clear separation of functions between shaft bearing and sealing function is achieved so that the bearing shells can be designed without being affected by a groove profile and on the other hand the labyrinth seal can only correspond to its inherent functions, namely the sealing function.
  • the aim is to manufacture the labyrinth sealing shells from a different material, for example from ceramic or special steel, and not from the same material as the housing cover, for example for reasons of wear, then it is proposed according to claim 3, by pressing, welding into the shaft receiving opening on the housing cover or glue to provide a sleeve with the labyrinth seal. Otherwise, a particularly simple solution is achieved in that the labyrinth seal is incorporated directly into the wall of the shaft receiving opening on the housing cover.
  • the effect of the labyrinth seal can be adapted to the medium being conveyed.
  • Another preferred embodiment is characterized by the wording of claim 6.
  • the housing closure as a plate, in which both the labyrinth seal and the bearing section are accommodated, the number of surfaces to be sealed is further reduced and the flexibility e.g. revisions increased.
  • the gear pump which is not shown in its details, has a central housing part 9 to which a lateral housing part 91 is attached at the end face by means of screw bolts 25.
  • the rotors 3, which are designed as meshing gears, run around inside the housing, one of which is driven by the shaft 5.
  • the lateral housing part 91 is provided with an opening 27 for the passage of the shaft 5 of the rotor 3, which forms a bearing section with bearing shells 29 for the shaft 5.
  • the housing cover 7 is fastened axially on the lateral housing part 91 by means of screw bolts 11, which defines a corresponding bore 31 for the shaft 5 with a sealing section. A bushing 33 is let into the bore 31 for the shaft 5.
  • the sleeve 33 made of a material that differs from the material of the housing cover 7, for example ceramic, has on its inside the labyrinth seal 21, as shown in dashed lines, preferably in the form of a threaded shaft seal.
  • the bushing 33 is anchored in the bore 31 of the housing cover 7 in a non-detachable manner, for example fixed in a material or non-positive manner.
  • the bearing section 27, 29 and the sealing section 21, 31 are structurally and functionally separate compared to previously known designs. This enables the use of materials that are optimally matched to the respective function (bearings or seals). A surface seal only has to be ensured between the housing cover 7 and the housing part 91. The problem of such sealing surfaces between the sleeve 33 and the housing cover 7 is eliminated.
  • FIG. 2 shows a further preferred and simplified shaft bushing, in which, based on the embodiment according to FIG. 1, the labyrinth seal 21 is worked directly into the housing cover 7 or its bore.
  • the housing cover 7 advantageously has a channel system 35 for a cooling medium, which, as shown, is preferably closed with an end plate 35a.
  • the effect of the labyrinth seal can thus be optimally adapted to the material being conveyed.
  • FIG. 3 shows: In a one-piece end plate 7a, which is anchored to the housing part 9 by means of screw bolts 11a , Both labyrinth seal 21 and the bearing shells 29 of the bearing section are arranged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

In order to seal off from the outside an outward-leading rotor shaft (5) of a gear pump, a labyrinth seal (21) is provided in the housing cover (7) through which the shaft (5) passes. Axially adjoining the labyrinth seal (21) on the inside is a bearing portion with bearing shells (29). <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Zahnradpumpe nach dem Oberbegriff von Anspruch 1. Es ist bekannt, bei Zahnradpumpen der genannten Art aus dem Gehäuse nach aussen geführte Rotorwellen mittels Labyrinthdichtungen abzudichten.The present invention relates to a gear pump according to the preamble of claim 1. It is known in the case of gear pumps of the type mentioned to seal rotor shafts guided outwards from the housing by means of labyrinth seals.

So ist es aus der US-PS 4 336 213 bekannt, die Welle des einen Rotors zu Antriebszwecken nach aussen zu führen. Hierzu wird einer der beiden Lagerdeckel, worunter gemeinhin, in Richtung der Rotorachsen betrachtet, der axiale Gehäuseabschluss verstanden wird, der üblicherweise an der Zentralpartie des Gehäuses festgeschraubt wird, zweiteilig ausgebildet. Die den Deckel axial durchgreifende Welle tritt in ein separates Lager- und Dichtungsteil ein, das sowohl Lagerfunktion wie auch Dichtungsfunktion hat. Die Aufnahmebohrung für die Welle am Lager-/Dichtungsteil weist eine Labyrinthdichtung auf, d.h. eine hydrodynamische Dichtung. Dieser Aufbau ist in mehrfacher Hinsicht nachteilig:

  • a) Das genannte Lager-/Dichtungsteil bzw. seine Aufnahmebohrung für die Welle wirkt einerseits als Lagerschale, anderseits mit der Labyrinthdichtung als Dichtungselement über seinen ganzen Axialabschnitt. Es ist in sehr vielen der gängigen Einsatzarten oder Konstruktionen von Zahnradpumpen äusserst problematisch, die Lagerschalen für die Rotoren mit den für eine Labyrinthdichtung notwendigen Nuten zu versehen, z.B. aus Gründen der damit nachhaltig erhöhten Flächenbeanspruchung der schraubenförmigen Kontaktfläche der Lagerschale.
  • b) Offenbar weil die Fertigung der Lager-/Dichtungsfläche mit integrierter Labyrinthdichtung als derart problematisch betrachtet wird, dass hierfür ein separates Teil als Rotationskörper vorgesehen wird, welches einer relativ leichten Bearbeitung zugänglich ist, wird in Kauf genommen, dass sowohl der Lagerdeckel am Zentralgehäuse dichtend zu befestigen ist mit der Notwendigkeit einer entsprechenden Anzahl von Befestigungsankern, und dass zusätzlich das zylindrische Lager-/Dichtungsteil im Lagerdeckel mit weiteren Befestigungsorganen zu montieren ist, und dass zusätzliche Flächen, nämlich zwischen dem Lager-/Dichtungsteil und dem Lagerdeckel, abzudichten sind.
It is known from US Pat. No. 4,336,213 to guide the shaft of one rotor to the outside for drive purposes. For this purpose, one of the two bearing caps, which is generally viewed in the direction of the rotor axes, is understood to mean the axial housing closure, which is usually screwed onto the central part of the housing, in two parts. The shaft penetrating axially through the cover enters a separate bearing and sealing part, which has both a bearing function and a sealing function. The mounting hole for the shaft on the bearing / sealing part has a labyrinth seal, ie a hydrodynamic seal. This structure is disadvantageous in several ways:
  • a) The mentioned bearing / sealing part or its receiving bore for the shaft acts on the one hand as a bearing shell, on the other hand with the labyrinth seal as a sealing element over its entire axial section. It is extremely problematic in many of the common types of use or constructions of gear pumps to provide the bearing shells for the rotors with the grooves necessary for a labyrinth seal, for example for reasons of the sustained increase in surface stress on the helical contact surface of the bearing shell.
  • b) Apparently because the production of the bearing / sealing surface with an integrated labyrinth seal is considered to be so problematic that a separate part is provided as a rotating body, which is relatively easy to process, it is accepted that both the bearing cover on the central housing seals is to be fastened with the need for a corresponding number of fastening anchors, and that the cylindrical bearing / sealing part in the bearing cover must also be fitted with further fastening members, and that additional surfaces, namely between the bearing / sealing part and the bearing cover, must be sealed.

Die Erfindung bezweckt, diese Nachteile zu beheben. Hierzu zeichnet sich eine Zahnradpumpe erfindungsgemäss durch die kennzeichnenden Merkmale von Anspruch 1 aus.The invention aims to overcome these disadvantages. For this purpose, a gear pump according to the invention is characterized by the characterizing features of claim 1.

Dadurch, dass das Lager der Welle in einem separaten Lagerabschnitt im Gehäuse axial innen angeordnet ist und die Labyrinthdichtung axial an den Lagerabschnitt anschliesst, wird eine klare Funktionstrennung von Wellenlagerung und Dichtungsfunktion erreicht, so dass die Lagerschalen ohne Beeinträchtigung durch ein Nutprofil ausgelegt werden können und andererseits die Labyrinthdichtung ausschliesslich ihren inhärenten Funktionen entsprechen kann, nämlich der Dichtungsfunktion.Because the bearing of the shaft is arranged in a separate bearing section in the housing axially on the inside and the labyrinth seal connects axially to the bearing section, a clear separation of functions between shaft bearing and sealing function is achieved so that the bearing shells can be designed without being affected by a groove profile and on the other hand the labyrinth seal can only correspond to its inherent functions, namely the sealing function.

Entgegen der gängigen Annahme, dass die Labyrinthdichtung aufgrund ihrer diffizilen Formgestaltung an einer eigens dafür vorgesehenen zylindrischen Büchse vorzusehen sei, womit aber die obgenannten Probleme bezüglich Montageaufwand und Dichtungsfläche in Kauf genommen werden, wird weiter gemäss Anspruch 2 vorgeschlagen, die Labyrinthdichtung direkt in die Wellenaufnahmeöffnung im Lagerdeckel einzuarbeiten.Contrary to the common assumption that the labyrinth seal is to be provided on a specially designed cylindrical sleeve due to its difficult shape, but with which the above-mentioned problems with regard to assembly effort and sealing surface are accepted further proposed according to claim 2, to incorporate the labyrinth seal directly into the shaft receiving opening in the bearing cap.

Wird dabei angestrebt, beispielsweise aus Gründen des Verschleisses, die Labyrinthdichtungsschalen aus einen anderen Material, beispielsweise aus Keramik oder Sonderstahl, zu fertigen und nicht aus demselben Material wie den Gehäusedeckel, so wird gemäss Anspruch 3 vorgeschlagen, in die Wellenaufnahmeöffnung am Gehäusedeckel durch Verpressen, Verschweissen oder Verkleben eine Büchse mit der Labyrinthdichtung vorzusehen. Anderenfalls wird nach dem Anspruch 4 eine besonders einfache Lösung dadurch erreicht, dass die Labyrinthdichtung direkt in die Wandung der Wellenaufnahmeöffnung am Gehäusedeckel eingearbeitet ist.If the aim is to manufacture the labyrinth sealing shells from a different material, for example from ceramic or special steel, and not from the same material as the housing cover, for example for reasons of wear, then it is proposed according to claim 3, by pressing, welding into the shaft receiving opening on the housing cover or glue to provide a sleeve with the labyrinth seal. Otherwise, a particularly simple solution is achieved in that the labyrinth seal is incorporated directly into the wall of the shaft receiving opening on the housing cover.

Durch Ausbildung der Zahnradpumpe nach Anspruch 5 kann weiter die Wirkung der Labyrinthdichtung dem jeweils geförderten Medium angepasst werden.By designing the gear pump according to claim 5, the effect of the labyrinth seal can be adapted to the medium being conveyed.

Eine weitere bevorzugte Ausführungsvariante zeichnet sich nach dem Wortlaut von Anspruch 6 aus. Durch Ausbildung des Gehäuseabschlusses als eine Platte, worin sowohl Labyrinthdichtung wie auch Lagerabschnitt untergebracht sind, wird nämlich die Anzahl abzudichtender Flächen weiter reduziert und die Flexibilität z.B. bezüglich Revisionen weiter erhöht.Another preferred embodiment is characterized by the wording of claim 6. By designing the housing closure as a plate, in which both the labyrinth seal and the bearing section are accommodated, the number of surfaces to be sealed is further reduced and the flexibility e.g. revisions increased.

Die Erfindung ist anschliessend anhand von in der Zeichnung gezeigten Ausführungsbeispielen erläutert. Es zeigen:

  • Fig. 1 schematisch einen Längsteilschnitt einer ersten Ausführungsform mit der Zahnradpumpe im Bereich der Wellendurchführung;
  • Fig. 2 eine weitere Ausführungsform der Wellendurchführung in einer der Figur 1 entsprechenden Darstellung, und
  • Fig. 3 eine weitere Ausführungsform der erfindungsgemässen Wellendurchführung in einer den Figuren 1 bzw. 2 entsprechenden Darstellung.
The invention is subsequently explained on the basis of exemplary embodiments shown in the drawing. Show it:
  • 1 schematically shows a partial longitudinal section of a first embodiment with the gear pump in the area of the shaft bushing;
  • Fig. 2 shows another embodiment of the shaft bushing in a representation corresponding to Figure 1, and
  • 3 shows a further embodiment of the shaft bushing according to the invention in a representation corresponding to FIGS. 1 and 2.

Die Zahnradpumpe, die in ihren Einzelheiten nicht gezeigt ist, weist gemäss Fig. 1 ein zentrales Gehäuseteil 9 auf, an das stirnseitig ein laterales Gehäuseteil 91 mittels Schraubenbolzen 25 angesetzt ist. Innerhalb des Gehäuses laufen die als kämmende Zahnräder ausgebildeten Rotoren 3 um, von denen einer mittels der Welle 5 angetrieben ist. Das laterale Gehäuseteil 91 ist mit einer Öffnung 27 für die Durchführung der Welle 5 des Rotors 3 versehen, die einen Lagerabschnitt mit Lagerschalen 29 für die Welle 5 bildet. Axial auf dem lateralen Gehäuseteil 91 ist der Gehäusedeckel 7 mittels Schraubenbolzen 11 befestigt, welcher eine entsprechende Bohrung 31 für die Welle 5 mit einem Dichtungsabschnitt definiert. In die Bohrung 31 für die Welle 5 ist eine Büchse 33 eingelassen. Die Büchse 33 aus einem vom Material des Gehäusedeckels 7 abweichenden Werkstoff, beispielsweise aus Keramik, weist an ihrer Innenseite die Labyrinthdichtung 21 auf, wie gestrichelt dargestellt vorzugsweise ausgebildet als Gewindewellendichtung. Die Büchse 33 ist in der Bohrung 31 des Gehäusedeckels 7 unlösbar verankert, z.B. stoffschlüssig oder kraftschlüssig festgelegt.According to FIG. 1, the gear pump, which is not shown in its details, has a central housing part 9 to which a lateral housing part 91 is attached at the end face by means of screw bolts 25. The rotors 3, which are designed as meshing gears, run around inside the housing, one of which is driven by the shaft 5. The lateral housing part 91 is provided with an opening 27 for the passage of the shaft 5 of the rotor 3, which forms a bearing section with bearing shells 29 for the shaft 5. The housing cover 7 is fastened axially on the lateral housing part 91 by means of screw bolts 11, which defines a corresponding bore 31 for the shaft 5 with a sealing section. A bushing 33 is let into the bore 31 for the shaft 5. The sleeve 33 made of a material that differs from the material of the housing cover 7, for example ceramic, has on its inside the labyrinth seal 21, as shown in dashed lines, preferably in the form of a threaded shaft seal. The bushing 33 is anchored in the bore 31 of the housing cover 7 in a non-detachable manner, for example fixed in a material or non-positive manner.

Durch die erfindungsgemässe Wellendurchführung sind, verglichen mit vorbekannten Ausführungen, der Lagerabschnitt 27,29 und der Dichtungsabschnitt 21,31 konstruktiv und funktionell getrennt. Dies ermöglicht den Einsatz von optimal auf die jeweilige Funktion (Lagern oder Dichten) abgestimmten Werkstoffen. Eine Flächendichtung muss nur zwischen dem Gehäusedeckel 7 und dem Gehäuseteil 91 sichergestellt sein. Das Problem derartiger Dichtungsflächen zwischen Büchse 33 und Gehäusedeckel 7 entfällt.Due to the shaft bushing according to the invention, the bearing section 27, 29 and the sealing section 21, 31 are structurally and functionally separate compared to previously known designs. This enables the use of materials that are optimally matched to the respective function (bearings or seals). A surface seal only has to be ensured between the housing cover 7 and the housing part 91. The problem of such sealing surfaces between the sleeve 33 and the housing cover 7 is eliminated.

In Fig. 2 ist eine weitere bevorzugte und vereinfachte Wellendurchführung dargestellt, bei welcher, ausgehend von der Ausführungsform nach Fig. 1, die Labyrinthdichtung 21 direkt in den Gehäusedeckel 7 bzw. dessen Bohrung eingearbeitet ist.FIG. 2 shows a further preferred and simplified shaft bushing, in which, based on the embodiment according to FIG. 1, the labyrinth seal 21 is worked directly into the housing cover 7 or its bore.

Wie in Fig. 1 und 2 bei 35 dargestellt, weist der Gehäusedeckel 7 vorteilhafterweise ein Kanalsystem 35 für ein Kühlmedium auf, das vorzugsweise, wie dargestellt, mit einer Abschlussplatte 35a verschlossen ist.As shown in FIGS. 1 and 2 at 35, the housing cover 7 advantageously has a channel system 35 for a cooling medium, which, as shown, is preferably closed with an end plate 35a.

Damit kann die Wirkung der Labyrinthdichtung optimal an das jeweilige geförderte Material angepasst werden.The effect of the labyrinth seal can thus be optimally adapted to the material being conveyed.

Bei einer weiteren Vereinfachung nach Fig. 3, bei der auch die Fläche zwischen Gehäusedeckel 7 und Gehäuseteil 91 nach den Figuren 1,2 entfällt, ist in Fig. 3 dargestellt: In einer einteiligen Abschlussplatte 7a, die mittels Schraubenbolzen 11a am Gehäuseteil 9 verankert ist, sind sowohl Labyrinthdichtung 21 wie auch die Lagerschalen 29 des Lagerabschnittes angeordnet.In a further simplification according to FIG. 3, in which the area between the housing cover 7 and the housing part 91 according to FIGS. 1, 2 is also omitted, FIG. 3 shows: In a one-piece end plate 7a, which is anchored to the housing part 9 by means of screw bolts 11a , Both labyrinth seal 21 and the bearing shells 29 of the bearing section are arranged.

Claims (7)

Zahnradpumpe mit einem Gehäuse und einem stirnseitigen Gehäuseabschluss, bei der mindestens eine der Rotorwellen durch den Gehäuseabschluss mit einem Lager und einer Labyrinthdichtung nach aussen geführt ist, dadurch gekennzeichnet, dass das Lager (29) der Welle (5) mit einem separaten Lagerabschnitt (27,29) des Gehäuseabschlusses (7,91) axial innen angeordnet ist und die Labyrinthdichtung (21) axial nach aussen an den Lagerabschnitt anschliesst.Gear pump with a housing and an end housing end, in which at least one of the rotor shafts is guided outwards through the housing end with a bearing and a labyrinth seal, characterized in that the bearing (29) of the shaft (5) has a separate bearing section (27, 29) of the housing end (7, 91) is arranged axially on the inside and the labyrinth seal (21) connects axially outwards to the bearing section. Zahnradpumpe, vorzugsweise nach mindestens einem der Ansprüche, wie nach Anspruch 1, dadurch gekennzeichnet, dass der stirnseitige Gehäuseabschluss aus einem mit dem Gehäuse (9) direkt verbundenen Gehäuseteil (91) mit dem Lagerabschnitt (29) und einem mit diesem verbundenen Gehäusedeckel (7) mit der Labyrinthdichtung (21) besteht.Gear pump, preferably according to at least one of the claims, as claimed in claim 1, characterized in that the front housing closure consists of a housing part (91) connected directly to the housing (9) with the bearing section (29) and a housing cover (7) connected to this with the labyrinth seal (21). Zahnradpumpe, vorzugsweise nach mindestens einem der Ansprüche, wie nach einem der Ansprüche 1 oder 2, dass in eine Bohrung (31) des Gehäusedeckels (7) eine Büchse eingelassen, wie eingeschweisst, eingeklebt oder eingepresst ist, und die Labyrinthdichtung (21) an deren Innenseite eingearbeitet ist.Gear pump, preferably according to at least one of the claims, such as according to one of claims 1 or 2, that in a bore (31) of the housing cover (7), a sleeve is inserted, such as welded, glued or pressed, and the labyrinth seal (21) on the other Is incorporated on the inside. Zahnradpumpe, vorzugsweise nach mindestens einem der Ansprüche, wie nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Labyrinthdichtung (21) in eine Bohrung im Gehäusedeckel (7) direkt eingearbeitet ist.Gear pump, preferably according to at least one of the claims, such as according to one of claims 1 or 2, characterized in that the labyrinth seal (21) is incorporated directly into a bore in the housing cover (7). Zahnradpumpe, vorzugsweise nach mindestens einem der Ansprüche, wie nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass im Gehäusedeckel (7) ein Kanalsystem für ein Kühlmedium vorgesehen ist, vorzugsweise in Form nach aussen offener Nuten (35) mit Abschlussplatte (35a).Gear pump, preferably according to at least one of the claims, as claimed in one of claims 1 to 4, characterized in that a channel system for a cooling medium is provided in the housing cover (7), preferably in the form of grooves (35) open to the outside with an end plate (35a). . Zahnradpumpe, vorzugsweise nach mindestens einem der Ansprüche, wie nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sowohl Lagerabschnitt (29) wie auch Labyrinthdichtung (21) in einer Gehäuseabschlussplatte (40) angeordnet sind.Gear pump, preferably according to at least one of the claims, as according to one of claims 1 to 5, characterized in that both the bearing section (29) and the labyrinth seal (21) are arranged in a housing end plate (40). Zahnradpumpe, vorzugsweise nach mindestens einem der Ansprüche, wie nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Labyrinthdichtung (21) als Gewinde-Dichtung ausgebildet ist.Gear pump, preferably according to at least one of the claims, such as according to one of claims 1 to 6, characterized in that the labyrinth seal (21) is designed as a thread seal.
EP93117448A 1992-12-16 1993-10-28 Gear pump Expired - Lifetime EP0602357B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9217162U DE9217162U1 (en) 1992-12-16 1992-12-16 Gear pump
DE9217162U 1992-12-16

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EP0602357A1 true EP0602357A1 (en) 1994-06-22
EP0602357B1 EP0602357B1 (en) 1997-08-06

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EP (1) EP0602357B1 (en)
JP (1) JPH0749088A (en)
DE (2) DE9217162U1 (en)

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ITMI20020263A1 (en) * 2002-02-12 2003-08-12 Alfatech Srl PUMP FOR THE TRANSPORT OF MELTED MASSES OF POLYMERS AND ELASTOMERS
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US6853954B2 (en) * 2002-09-24 2005-02-08 John K. Apostolides Methods and systems for collecting and processing data in association with machine operation and maintenance
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US4293291A (en) * 1977-12-19 1981-10-06 General Signal Corporation Gear pump with improved shaft seal
US4336213A (en) * 1980-02-06 1982-06-22 Fox Steve A Plastic extrusion apparatus and method
GB2202005A (en) * 1987-03-12 1988-09-14 Ssp Pumps Pump
DE4125128A1 (en) * 1990-08-10 1992-02-13 Barmag Barmer Maschf Gear-pump for molten polymer - has screw-thread delivering to interior between unloading zone and airtight seal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000034554A1 (en) * 1998-12-04 2000-06-15 Barmag Ag Extrusion pump
US6315537B1 (en) 1998-12-04 2001-11-13 Barmag Ag Spin pump having a cooling sleeve surrounding the drive shaft

Also Published As

Publication number Publication date
EP0602357B1 (en) 1997-08-06
JPH0749088A (en) 1995-02-21
US5462420A (en) 1995-10-31
DE59307068D1 (en) 1997-09-11
DE9217162U1 (en) 1993-03-25

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