EP0602357B1 - Gear pump - Google Patents
Gear pump Download PDFInfo
- Publication number
- EP0602357B1 EP0602357B1 EP93117448A EP93117448A EP0602357B1 EP 0602357 B1 EP0602357 B1 EP 0602357B1 EP 93117448 A EP93117448 A EP 93117448A EP 93117448 A EP93117448 A EP 93117448A EP 0602357 B1 EP0602357 B1 EP 0602357B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- labyrinth seal
- casing
- gear pump
- housing
- 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
Links
- 239000002826 coolant Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 29
- 239000000463 material Substances 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Images
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
- 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.
- the gear pump rotor under consideration is rotatably mounted on one of the housing covers and also on the opposite one, but is carried out to the outside there by a bearing insert.
- a sealing arrangement acts between the gear and the bushing on the mentioned housing cover between the housing and the rotor shaft and prevents the medium from escaping axially against the bushing.
- a gear pump of the type mentioned is known from DE-OS 4 125 128.
- the shaft of one of the gear pump rotors, which runs through to the outside, is axially advancing to the outside and is only slidably supported in the pump housing and then penetrates the side wall of the pump housing.
- a relief zone is provided there.
- a sealing housing is placed on the side wall of the pump housing, in which further sealing devices are arranged for the drive shaft that is led through to the outside.
- a leak zone is provided in the sealing housing, followed by a feed thread first labyrinth seal, then an intermediate zone in the form of an annular groove, another labyrinth seal in the form of a conveying thread, and a collecting space with an outlet.
- An annular groove with a sealing ring is provided in the sealing housing following the collecting space. Furthermore, an annular chamber is formed in the sealing housing, in which a barrier medium is received.
- a flange is also mounted on the sealing housing mounted on the side wall of the housing or the housing cover, axially on the outside, with a further labyrinth seal designed as a sealing thread, which prevents the barrier medium from escaping into the environment.
- the bearing of the shaft as in the pump according to DE-OS 4 125 128, is arranged axially on the inside in a separate bearing section and the seal axially adjoins 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 interference from a groove profile and, on the other hand, the seal can only correspond to its inherent functions.
- the labyrinth seal is incorporated according to the invention directly into the wall of the shaft receiving opening on the housing cover.
- 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 2, 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.
- a further preferred embodiment variant is distinguished by the wording of claim 5.
- the gear pump which is not shown in its details, has, according to FIG. 1, 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 in a firmly bonded 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.
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.
- 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 for this purpose, which is relatively easy to process, it is accepted that both the bearing cover on the central housing seals To be fastened with the need for a corresponding number of fastening anchors, and that the cylindrical bearing / sealing part in the bearing cover is to be mounted with additional fastening members, and that additional surfaces, namely between the bearing / sealing part and the bearing cover, must be sealed.
Aus der US-A 4 293 291 ist es bekannt, eine nach aussen geführte Rotorwelle einer Zahnradpumpe erst mittels eines Rollenlagers zu lagern und axial anschliessend eine Dichtungsanordnung im Gehäusedeckel vorzusehen, welche einen elastischen Gleitring umfasst.From US-A 4 293 291 it is known to mount an outwardly directed rotor shaft of a gear pump only by means of a roller bearing and then axially to provide a sealing arrangement in the housing cover which comprises an elastic slide ring.
Gemäss der US-A 3 976 405 ist der eine betrachtete Zahnradpumpenrotor am einen der Gehäusedeckel drehgelagert, ebenso am gegenüberliegenden, dort aber durch einen Lagereinsatz nach aussen durchgeführt. Zwischen Zahnrad und Durchführungslager am erwähnten Gehäusedeckel wirkt eine Dichtungsanordnung zwischen Gehäuse und durchgeführter Rotorwelle und verhindert, dass Fördermedium axial gegen das Durchführungslager austritt.According to US Pat. No. 3,976,405, the gear pump rotor under consideration is rotatably mounted on one of the housing covers and also on the opposite one, but is carried out to the outside there by a bearing insert. A sealing arrangement acts between the gear and the bushing on the mentioned housing cover between the housing and the rotor shaft and prevents the medium from escaping axially against the bushing.
Aus der GB-A 2 202 005 ist es bekannt, die Welle eines Zahnradpumpenrotors durch das Pumpengehäuse nach aussen durchzuführen und dabei eine kombinierte Dichtung vorzusehen. Sie umfasst eine Labyrinthdichtung, eingearbeitet in einen ringförmigen Einsatz im Gehäuse, welcher einer elastischen Lippendichtung folgt. Es folgt, axial anschliessend, eine komplizierte Dichtungsanordnung in einem Gehäuse, welches im Bereich der Wellendurchführung am Deckel des Gehäuses festgeschraubt ist.From GB-A 2 202 005 it is known to lead the shaft of a gear pump rotor through the pump housing to the outside and to provide a combined seal. It includes a labyrinth seal, incorporated in an annular insert in the housing, which follows an elastic lip seal. This is followed, axially afterwards, by a complicated sealing arrangement in a housing which is screwed onto the cover of the housing in the area of the shaft bushing.
Aus der DE-OS 4 125 128 ist schliesslich eine Zahnradpumpe eingangs genannter Art bekannt. Die nach aussen durchgeführte Welle eines der Zahnradpumpenrotoren ist, axial nach aussen fortschreitend, erst im Pumpengehäuse gleitgelagert und durchdringt anschliessend die Seitenwand des Pumpengehäuses. Daran ist eine Entlastungszone vorgesehen. Auf die Seitenwand des Pumpengehäuses ist ein Dichtgehäuse aufgesetzt, in dem weitere Dichteinrichtungen für die nach aussen durchgeführte Antriebswelle angeordnet sind. Im Dichtgehäuse ist eine Leckzone vorgesehen, anschliessend eine als Fördergewinde ausgebildete erste Labyrinthdichtung, dann eine als Ringnut ausgebildete Zwischenzone, eine weitere als Fördergewinde ausgebildete Labyrinthdichtung sowie ein Sammelraum mit einem Ablass. Im Anschluss an den Sammelraum ist im Dichtgehäuse eine Ringnut vorgesehen mit einem Dichtring. Weiter ist im Dichtgehäuse eine Ringkammer ausgebildet, in welcher ein Sperrmedium aufgenommen wird. Auf dem auf der Seitenwand des Gehäuses bzw. dem Gehäusedeckel aufmontierten Dichtgehäuse ist weiter, axial aussen, ein Flansch montiert, mit einer als Dichtgewinde ausgebildeten weiteren Labyrinthdichtung, die den Austritt des Sperrmediums in die Umgebung verhindert.Finally, a gear pump of the type mentioned is known from DE-OS 4 125 128. The shaft of one of the gear pump rotors, which runs through to the outside, is axially advancing to the outside and is only slidably supported in the pump housing and then penetrates the side wall of the pump housing. A relief zone is provided there. A sealing housing is placed on the side wall of the pump housing, in which further sealing devices are arranged for the drive shaft that is led through to the outside. A leak zone is provided in the sealing housing, followed by a feed thread first labyrinth seal, then an intermediate zone in the form of an annular groove, another labyrinth seal in the form of a conveying thread, and a collecting space with an outlet. An annular groove with a sealing ring is provided in the sealing housing following the collecting space. Furthermore, an annular chamber is formed in the sealing housing, in which a barrier medium is received. A flange is also mounted on the sealing housing mounted on the side wall of the housing or the housing cover, axially on the outside, with a further labyrinth seal designed as a sealing thread, which prevents the barrier medium from escaping into the environment.
Bei dieser Zahnradpumpe sind Gleitlagerbereiche und axial nach aussen anschliessende Dichtungen funktionell klar getrennt. Nachteilig daran ist aber das Dichtgehäuse und der anschliessende Flansch, womit im eingangs erwähnten Sinne bearbeitungsintensive Dichtflächen zwischen Seitenwand bzw. Gehäusedeckel und Dichtgehäuse einerseits und zwischen Dichtgehäuse und Flansch anderereits vorzusehen sind.In this gear pump, plain bearing areas and seals that axially adjoin to the outside are functionally clearly separated. A disadvantage of this, however, is the sealing housing and the adjoining flange, with which, in the sense mentioned at the outset, machining-intensive sealing surfaces between the side wall or housing cover and sealing housing on the one hand and between the sealing housing and flange on the other are to be provided.
Es ist Aufgabe der vorliegenden Erfindung, an einer Pumpe letztgenannter Art, den erwähnten Nachteil zu beheben.It is an object of the present invention to remedy the disadvantage mentioned on a pump of the latter type.
Dies wird durch deren Ausbildung nach dem kennzeichnenden Teil von Anspruch 1 erreicht.This is achieved by their training according to the characterizing part of claim 1.
Dadurch, dass das Lager der Welle, wie bei der Pumpe gemäss der DE-OS 4 125 128, in einem separaten Lagerabschnitt axial innen angeordnet ist und die Dichtung 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 Dichtung ausschliesslich ihren inhärenten Funktionen entsprechen kann.Because the bearing of the shaft, as in the pump according to DE-OS 4 125 128, is arranged axially on the inside in a separate bearing section and the seal axially adjoins 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 interference from a groove profile and, on the other hand, the seal can only correspond to its inherent functions.
Entgegen der gängigen Annahme, dass eine Labyrinthdichtung aufgrund ihrer diffizilen Formgestaltung an einem eigens dafür vorgesehenen Teil vorzusehen sei, womit aber die obgenannten Probleme bezüglich Montageaufwand und Dichtungsflächen in Kauf genommen werden, ist die Labyrinthdichtung erfindungsgemäss direkt in die Wandung der Wellenaufnahmeöffnung am Gehäusedeckel eingearbeitet.Contrary to the common assumption that a labyrinth seal is to be provided on a specially designed part due to its difficult shape, but with which the above-mentioned problems with regard to assembly effort and sealing surfaces are accepted, the labyrinth seal is incorporated according to the invention directly into the wall of the shaft receiving opening on the housing cover.
Wird dabei angestrebt, beispielsweise aus Gründen des Verschleisses, die Labyrinthdichtungsschalen aus einem anderen Material, beispielsweise aus Keramik oder Sonderstahl, zu fertigen und nicht aus demselben Material wie den Gehäusedeckel, so wird gemäss Anspruch 2 vorgeschlagen, in die Wellenaufnahmeöffnung am Gehäusedeckel durch Verpressen, Verschweissen oder Verkleben eine Büchse mit der Labyrinthdichtung vorzusehen. Anderenfalls wird nach dem Anspruch 3 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 2, 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 4 kann weiter die Wirkung der Labyrinthdichtung dem jeweils geförderten Medium angepasst werden.By designing the gear pump according to claim 4, 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 5 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.A further preferred embodiment variant is distinguished by the wording of
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.
- 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.The gear pump, which is not shown in its details, has, according to FIG. 1, a
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
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
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
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
Claims (6)
- Gear pump with a casing and a frontal casing closure in which at least one of the rotor shafts is guided to the outside through the casing closure with a bearing and a labyrinth seal, where the bearing (29) of the shaft (5) together with a separate bearing section (27, 29) of the casing closure (7, 91) is arranged axially on the inside and the labyrinth seal (21) is adjacent to the bearing part axially on the outside, characterised in that the frontal casing closure comprises a casing part (91) screwed to the casing (9) by screw bolts (25) with the bearing section (29) and a casing cover (7) connected to the latter with the labyrinth seal (21).
- Gear pump according to claim 1, characterised in that in a hole (31) in the casing cover (7) is let a bush by welding, gluing or pressing and the labyrinth seal (21) is worked on its inside.
- Gear pump according to claim 1, characterised in that the labyrinth seal (21) is worked directly in a hole in the casing cover (7).
- Gear pump according to any of claims 1 to 3, characterised in that in the casing cover (7) is provided a channel system for a coolant, preferably in the form of grooves (35) open to the exterior with a closure plate (35a).
- Gear pump according to any of claims 1 to 4, characterised in that both the bearing part (29) and the labyrinth seal (21) are arranged in a casing closure plate (40).
- Gear pump according to any of claims 1 to 5, characterised in that the labyrinth seal (21) is formed as a threaded seal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9217162U | 1992-12-16 | ||
| DE9217162U DE9217162U1 (en) | 1992-12-16 | 1992-12-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0602357A1 EP0602357A1 (en) | 1994-06-22 |
| EP0602357B1 true EP0602357B1 (en) | 1997-08-06 |
Family
ID=6887187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93117448A Expired - Lifetime EP0602357B1 (en) | 1992-12-16 | 1993-10-28 | Gear pump |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5462420A (en) |
| EP (1) | EP0602357B1 (en) |
| JP (1) | JPH0749088A (en) |
| DE (2) | DE9217162U1 (en) |
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| CA2170792C (en) * | 1995-04-26 | 2002-06-25 | Jason J. Hill | Anti-leakage device |
| US7137789B2 (en) * | 1997-07-18 | 2006-11-21 | Rpm Industries, Inc. | Vent for reducing seal pressure in pump assembly |
| US6544008B1 (en) * | 1997-07-18 | 2003-04-08 | John K. Apostolides | Internal vent for reducing seal pressure in prelubrication pump assembly |
| US9062575B2 (en) * | 1997-10-30 | 2015-06-23 | RPM Industries, LLC | Methods and systems for performing, monitoring and analyzing multiple machine fluid processes |
| US7150286B2 (en) * | 1997-10-30 | 2006-12-19 | Rpm Industries, Inc. | Methods and systems for performing, monitoring and analyzing multiple machine fluid processes |
| US6988506B1 (en) | 1997-10-30 | 2006-01-24 | Rpm Industries, Inc. | Fluid transfer system |
| US6708710B1 (en) * | 1997-10-30 | 2004-03-23 | Rpm Industries, Inc. | Vehicle fluid change apparatus and method |
| KR20010040602A (en) * | 1998-12-04 | 2001-05-15 | 이.파우. 뢰르허 | Extrusion pump |
| ITMO20010108A1 (en) * | 2001-05-29 | 2002-11-29 | Rossi Motoriduttori Spa | DYNAMIC SEALING DEVICE FOR REDUCER |
| ITMI20020263A1 (en) * | 2002-02-12 | 2003-08-12 | Alfatech Srl | PUMP FOR THE TRANSPORT OF MELTED MASSES OF POLYMERS AND ELASTOMERS |
| US20040070152A1 (en) * | 2002-08-05 | 2004-04-15 | Oehman Robert E. | Ventilated pump shaft seal |
| 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 |
| EP3366956B1 (en) * | 2016-01-18 | 2020-03-04 | Mitsubishi Heavy Industries Compressor Corporation | Sealing device and rotating machine |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1072421A (en) * | 1911-01-11 | 1913-09-09 | Brown Lipe Gear Co | Lubricant-retaining means. |
| DE1553133A1 (en) * | 1966-12-23 | 1970-07-30 | Maag Zahnraeder & Maschinen Ag | High pressure gear pump |
| US3945779A (en) * | 1973-08-30 | 1976-03-23 | Robert Bosch Gmbh | Bearings for the trunnions of gears in gear pumps or the like |
| US3976405A (en) * | 1974-10-29 | 1976-08-24 | Cominco Ltd. | Pump |
| 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 |
| US4471963A (en) * | 1984-01-09 | 1984-09-18 | Luwa Corporation | Sealing member for rotating shaft and method of sealing therewith |
| GB2202005B (en) * | 1987-03-12 | 1990-11-07 | Ssp Pumps | Pump |
| DE4125128C2 (en) * | 1990-08-10 | 1994-11-24 | Barmag Barmer Maschf | Gear pump |
-
1992
- 1992-12-16 DE DE9217162U patent/DE9217162U1/de not_active Expired - Lifetime
-
1993
- 1993-10-28 DE DE59307068T patent/DE59307068D1/en not_active Expired - Fee Related
- 1993-10-28 EP EP93117448A patent/EP0602357B1/en not_active Expired - Lifetime
- 1993-12-15 JP JP5314958A patent/JPH0749088A/en active Pending
- 1993-12-15 US US08/167,079 patent/US5462420A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59307068D1 (en) | 1997-09-11 |
| DE9217162U1 (en) | 1993-03-25 |
| JPH0749088A (en) | 1995-02-21 |
| EP0602357A1 (en) | 1994-06-22 |
| US5462420A (en) | 1995-10-31 |
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