EP0669465A2 - Bearing arrangement for a viscous fluid pump - Google Patents

Bearing arrangement for a viscous fluid pump Download PDF

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Publication number
EP0669465A2
EP0669465A2 EP95107891A EP95107891A EP0669465A2 EP 0669465 A2 EP0669465 A2 EP 0669465A2 EP 95107891 A EP95107891 A EP 95107891A EP 95107891 A EP95107891 A EP 95107891A EP 0669465 A2 EP0669465 A2 EP 0669465A2
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EP
European Patent Office
Prior art keywords
bearing
pump
return
channels
collecting
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
EP95107891A
Other languages
German (de)
French (fr)
Other versions
EP0669465B1 (en
EP0669465A3 (en
Inventor
Peter Dipl. Ing. Blume
Roger Dr. Ing. Stehr
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
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
Priority to ES95107891T priority Critical patent/ES2110799T3/en
Priority to DE59501083T priority patent/DE59501083D1/en
Priority to EP95107891A priority patent/EP0669465B1/en
Priority to AT95107891T priority patent/ATE161075T1/en
Application filed by Maag Pump Systems AG filed Critical Maag Pump Systems AG
Publication of EP0669465A2 publication Critical patent/EP0669465A2/en
Publication of EP0669465A3 publication Critical patent/EP0669465A3/en
Priority to JP8535234A priority patent/JPH11505910A/en
Priority to US08/952,649 priority patent/US6123531A/en
Priority to PCT/CH1996/000164 priority patent/WO1996037705A1/en
Priority to AU53304/96A priority patent/AU5330496A/en
Application granted granted Critical
Publication of EP0669465B1 publication Critical patent/EP0669465B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
    • 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
    • F04C15/0088—Lubrication
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • 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
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • F04C2240/56—Bearing bushings or details thereof

Definitions

  • the present invention relates to a bearing arrangement for a pump shaft for conveying Newtonian or non-Newtonian liquids with different viscosities with a bearing for the shaft, a gear pump and a method for collecting and returning leakage liquid passing through a bearing when pumping liquids with different viscosities.
  • a batchwise or batchwise polymerization can be carried out for process engineering reasons.
  • a gear pump can be used for this.
  • very low-viscosity liquid first enters the pump, which means that there is an extremely low pressure difference in the pump.
  • the pump conveys high to medium viscosity melt against downstream pressure consumers, such as filters, extrusion tools and the like. As a result, the pump has to convey against a significantly higher pressure difference.
  • the task is to ensure leakage lubrication when changing over from conveying a highly viscous medium to conveying a low-viscosity medium, i.e. that a heavily impeded flow or even a blockage of the return arrangement for the low-viscosity fluid is prevented.
  • the return duct system of a pump proposed for the conveyance of liquids with different viscosities has at least one catch or relief zone arranged either on the back of each bearing or on both pump covers, for collecting leakage liquid passing through the bearing along the shaft, which is also responsible for lubricating the bearing.
  • the return system has at least two return channels or bores from each of the collecting or relief zones in order to return the collected leakage fluid to the suction side of the pump.
  • At least one of the channels or bores can be closed, which makes it possible, depending on the viscosity of the medium to be pumped, to close one of the bores, or to keep all bores or return channels open. If high-viscosity media are fed, the hole for the low-viscosity medium should be closed; if the low-viscosity medium or product is being conveyed, the hole for the low-viscosity medium should be open. In last In the event, the flow resistance ratio is such that the return hole for the high-viscosity product appears to the low-viscosity product to be closed.
  • the return hole closer to the back of the bearing or the low-pressure side is preferably reserved for the return of the low-viscosity liquid.
  • this closer return hole is opened after the switchover from conveying a highly viscous medium to conveying the low-viscosity medium, which return channel is not "blocked" by highly viscous medium.
  • this closer return channel is opened after switching to polymerization or circulation mode.
  • the polymerization increases the viscosity in the polyester to be circulated, and after reaching a certain viscosity or after reaching a certain differential pressure or after switching back to extrusion operation, the nearer return duct is closed again so that no highly viscous material can enter it.
  • This closer return hole can be closed and opened hydraulically, pneumatically or by electric motor, for example using a stepper motor. Whether the shorter return channel ultimately runs through the slide bearing or through the housing surrounding the slide bearing depends, for example, on the geometric conditions. In any case, both versions are possible.
  • return channels of the same type at least along a common section, i.e. return channels for low-viscosity media can be combined and return channels for high-viscosity media.
  • a bearing of a drive shaft 1 of a gear pump is shown schematically in longitudinal section, running through a housing wall 7.
  • a gear 5 is arranged on the shaft 1 in the pump chamber 3 in order to convey a viscous liquid in the direction of arrow A.
  • the shaft 1 is supported in a slide bearing 9, through which bearing, along the shaft 1, in the intermediate space 10 due to the high pressure in the pump chamber 3, the medium to be pumped is driven.
  • This so-called leakage liquid also serves to lubricate the slide bearing 9.
  • a collecting or annular space 11 is arranged on the back of the slide bearing 9 in order to collect the leakage liquid passing through the slide bearing 9.
  • this collecting or annular space 11 is connected to the suction side of the pump space 3 via two return channels 13 and 15.
  • a valve 17 is also provided, for example.
  • FIG. 2 shows, analogously, in longitudinal section a further embodiment variant of a bearing according to the invention or a return arrangement, the collecting or annular space 11 now being arranged at least partially inside the rear of the sliding bearing 9.
  • the two return channels 13 and 15 are in turn arranged peripherally from this annular space 11, running outwards, with the result that at least the branch 13a or 15a of each return channel, which runs perpendicular to the shaft 1, appears as lying one on top of the other.
  • the two return duct sections 13a and 15a can also be guided independently of one another in this area, or they can be combined. This is because sections 13a and 15a can be very short. In contrast, the return holes 13 and 15, which are comparatively long, must be guided separately.
  • FIG. 3 shows an arrangement similar to that in FIG. 2, but the return duct sections 13a and 15a are guided in the cover 8 of the pump.
  • These return channel sections 13a and 15a can be formed, for example, by a so-called V-groove.
  • This V-groove or V-grooves open into the two, e.g. return bores 13 and 15 lying one behind the other, which is why they do not appear as separately guided bores in the illustration according to FIG. 3.
  • a sealing arrangement 16 is shown in the cover 8 in FIG. 3.
  • FIGS. 1-4 are of course only examples which can be modified, modified or supplemented in any manner. So it is of course possible to arrange further return channels and, in the case of several return channels, also to design more than one return channel to be closable. This can be useful, for example, if the viscosities of the different liquids to be pumped differ greatly.
  • the sealability of the return channels can also be achieved in various ways, but this is know-how which is known per se and cannot be explained in more detail here. It is also in itself immaterial whether the return channels are partially passed through the bearings themselves or through the housing wall. Finally, it should be pointed out that the illustration of the sealing arrangement adjacent to the collecting or annular space has been omitted in the figures, since this is not part of the present invention.
  • the discharge or return system has at least two return channels or bores, on each pump side.

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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)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Sliding-Contact Bearings (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The bearing acts on a pump shaft (1) within the pump. At least on side of the low pressure side of the bearing is arranged a collection or release zone for fluid which has leaked through the bearing. At least two channels (13,15) join the zone to the suction side of the pump. One at least of these channels can be shut off independently to one another. They can be of different diameters or cross-sectional areas, and the zone itself can consist of an annular chamber adjacent to the shaft. It can be contained at least partly in the plain bearing itself (9) or the pump cover.

Description

Die vorliegende Erfindung betrifft eine Lageranordnung für eine Pumpenwelle für das Fördern von newtonischen oder nichtnewtonischen Flüssigkeiten mit unterschiedlicher Viskosität mit einem Lager für die Welle, eine Zahnradpumpe sowie ein Verfahren zum Auffangen und Rückführen von durch ein Lager hindurchtretender Leckageflüssigkeit beim Pumpen von Flüssigkeiten mit unterschiedlicher Viskosität.The present invention relates to a bearing arrangement for a pump shaft for conveying Newtonian or non-Newtonian liquids with different viscosities with a bearing for the shaft, a gear pump and a method for collecting and returning leakage liquid passing through a bearing when pumping liquids with different viscosities.

Bei Pumpen, wie beispielsweise Zahnradpumpen, kann nicht verhindert werden bzw. ist es notwenig, dass ein kleiner Teil des zu fördernden flüssigen Mediums, welches unter einem relativ grossen Druck steht, entlang beispielsweise der Antriebswelle durch ein Gleitlager hindurch getrieben wird. Dieser Leckagestrom wird in der Regel dazu benutzt, das Gleitlager zu schmieren. Nach dem Durchtreten durch das Gleitlager wird die Lekkageflüssigkeit in einer Auffangrinne oder einer Entlastungsrinne aufgefangen, um über einen Verbindungskanal der Pumpe auf deren Einlasseite zurückgeführt zu werden. Derartige Abdichtungs- bzw. Rückführanordnungen sind beispielsweise aus der DE-544 963 und 31 35 037 bekannt. Solange in einer Pumpe kontinuierlich Flüssigkeiten mit weitgehend gleichbleibender Viskosität gefördert werden, sind die bekannten Rückführanordnungen durchaus ausreichend. Beim diskontinuierlichen Pumpen von Flüssigkeiten mit stark unterschiedlicher Viskosität hingegen sind die beschriebenen Anordnungen ungeeignet.With pumps, such as gear pumps, it cannot be prevented or it is necessary for a small part of the liquid medium to be conveyed, which is under a relatively high pressure, to be driven along a slide bearing along the drive shaft, for example. This leakage flow is usually used to lubricate the plain bearing. After passing through the plain bearing, the leakage fluid is collected in a collecting channel or a relief channel in order to be returned to the inlet side of the pump via a connecting channel. Such sealing or return arrangements are known for example from DE-544 963 and 31 35 037. As long as liquids with largely constant viscosity are continuously pumped in a pump, the known return arrangements are quite sufficient. In contrast, the arrangements described are unsuitable for the discontinuous pumping of liquids with very different viscosities.

So kann beispielsweise bei der Herstellung von Polyester aus verfahrenstechnischen Gründen eine diskontinuierliche bzw. batchweise Polymerisation durchgeführt werden. Hierfür kann eine Zahnradpumpe zum Einsatz kommen. Während der Polymerisationsphase bzw. Zirkulationsphase gelangt zunächst sehr niedrigviskose Flüssigkeit in die Pumpe, wodurch in der Pumpe eine äusserst geringe Druckdifferenz vorhanden ist. Nach Abschluss der Polymerisationsphase, d.h. während der Extrusionsphase, fördert die Pumpe hoch- bis mittelviskose Schmelze gegen nachgeschaltete Druckverbraucher, wie beispielsweise Filter, Extrusionswerkzeuge und dgl., wodurch die Pumpe gegen eine deutlich höhere Druckdifferenz fördern muss.In the production of polyester, for example, a batchwise or batchwise polymerization can be carried out for process engineering reasons. A gear pump can be used for this. During the polymerization phase or circulation phase, very low-viscosity liquid first enters the pump, which means that there is an extremely low pressure difference in the pump. After completion of the polymerization phase, i.e. during the extrusion phase, the pump conveys high to medium viscosity melt against downstream pressure consumers, such as filters, extrusion tools and the like. As a result, the pump has to convey against a significantly higher pressure difference.

Aus der Sicht der Pumpe ergibt sich somit folgende Schwierigkeit:

  • Wahrend der Förderung des hochviskosen Produktes, d.h. während der Extrusionsphase, ist der Differenzdruck über der Pumpe hinreichend gross, um einen ausreichenden Schmierstrom bzw. Lekkagestrom durch die Lager hindurch sowie durch das Rückführkanalsystem zur Saugseite der Pumpe zu bewirken. Nach Umschalten auf Zirkulationsbetrieb, d.h. wahrend des Pumpbetriebes in der Polymerisationsphase, ist der Differenzdruck sehr niedrig, wenn auch ausreichend für das niedrigviskose, fluide Medium. Jedoch befindet sich zum Zeitpunkt des Umschaltens noch hochviskose Flüssigkeit im Rückführsystem, welches hochviskose Medium nach dem Umschalten aufgrund des niedrigen Differenzdruckes nur sehr langsam durch die neue niedrigviskose Flüssigkeit ersetzt werden kann. Durch eine Stagnation des Lagerleckstromes besteht die potentielle Gefahr der Lagerunterversorgung, wodurch die Gefahr der Schädigung des Lagers gegeben ist.
From the pump's point of view, the following difficulty arises:
  • During the conveyance of the highly viscous product, ie during the extrusion phase, the differential pressure across the pump is sufficiently high to cause a sufficient lubrication flow or leakage flow through the bearings and through the return channel system to the suction side of the pump. After switching to circulation mode, ie during the pumping operation in the polymerization phase, the differential pressure is very low, albeit sufficient for the low-viscosity, fluid medium. However, at the time of switching, there is still highly viscous liquid in the feedback system, which highly viscous medium can only be replaced very slowly by the new, low-viscosity liquid after the switching due to the low differential pressure. A stagnation of the bearing leakage current poses the potential risk of undersupply of the bearing, whereby there is a risk of damage to the bearing.

Es ist daher eine Aufgabe der vorliegenden Erfindung, eine Rückführanordnung an einer Pumpenwelle vorzuschlagen, mittels welcher eine ausreichende Leckageschmierung beim Fördern von Flüssigkeiten mit unterschiedlicher Viskosität gewährleistet bleibt. Insbesondere besteht die Aufgabe darin, die Leckageschmierung zu gewährleisten, wenn vom Fördern eines hochviskosen Mediums auf das Fördern eines niedrigviskosen Mediums umgestellt wird, d.h. dass ein stark behindertes Fliessen oder gar ein Verstopfen der Rückführanordnung für das niedrigviskose Fluid verhindert wird.It is therefore an object of the present invention to propose a return arrangement on a pump shaft, by means of which sufficient leakage lubrication remains ensured when conveying liquids with different viscosities. In particular, the task is to ensure leakage lubrication when changing over from conveying a highly viscous medium to conveying a low-viscosity medium, i.e. that a heavily impeded flow or even a blockage of the return arrangement for the low-viscosity fluid is prevented.

Die gestellte Aufgabe wird mittels einer Lageranordnung bzw. Rückführanordnung für eine Pumpenwelle einer Pumpe für das Fördern von Flüssigkeiten mit stark unterschiedlicher Viskosität gemäss dem Wortlaut nach Anspruch 1 gelöst.The stated object is achieved by means of a bearing arrangement or return arrangement for a pump shaft of a pump for the conveyance of liquids with very different viscosities according to the wording according to claim 1.

Das erfindungsgemäss vorgeschlagene Rückführkanalsystem einer Pumpe für das Fördern von Flüssigkeiten mit unterschiedlicher Viskosität,

Figure imgb0001

weist mindestens eine entweder an jeder Lagerrückseite oder an beiden Pumpendeckeln angeordnete Auffang- oder Entlastungszone auf, für das Auffangen von entlang der Welle durch das Lager durchtretende Leckageflüssigkeit, welche gleichzeitig für das Schmieren des Lagers verantwortlich ist. Von den Auffang- bzw. Entlastungszonen weist das Rückführsystem mindestens je zwei Rückführkanäle oder Bohrungen auf, um die aufgefangene Lekkageflüssigkeit an die Saugseite der Pumpe zurückzuführen.The return duct system of a pump proposed for the conveyance of liquids with different viscosities,
Figure imgb0001
has at least one catch or relief zone arranged either on the back of each bearing or on both pump covers, for collecting leakage liquid passing through the bearing along the shaft, which is also responsible for lubricating the bearing. The return system has at least two return channels or bores from each of the collecting or relief zones in order to return the collected leakage fluid to the suction side of the pump.

Vorzugsweise ist mindestens einer der Kanäle bzw. Bohrungen verschliessbar, wodurch es nun möglich wird, je nach dem, welche Viskosität das in der Pumpe zu fördernde Medium aufweist, eine der Bohrungen zu verschliessen, oder aber sämtliche Bohrungen bzw. Rückführkanäle offen zu halten. Wenn hochviskose Medien geführt werden, soll die Bohrung für das niedrigviskose Medium verschlossen sein; wenn das niedrigviskose Medium bzw. Produkt gefördert wird, soll die Bohrung für das niedrigviskose Medium offen sein. In letzterem Falle ist das Fliesswiderstandsverhältnis derart, dass dem niedrigviskosen Produkt die Rückführbohrung für das hochviskose Produkt als geschlossen erscheint.Preferably, at least one of the channels or bores can be closed, which makes it possible, depending on the viscosity of the medium to be pumped, to close one of the bores, or to keep all bores or return channels open. If high-viscosity media are fed, the hole for the low-viscosity medium should be closed; if the low-viscosity medium or product is being conveyed, the hole for the low-viscosity medium should be open. In last In the event, the flow resistance ratio is such that the return hole for the high-viscosity product appears to the low-viscosity product to be closed.

Weitere bevorzugte Ausführungsvarianten der erfindungsgemäss definierten Lageranordnung bzw. der erfindungsgemäss definierten Rückführanordnung sind in den abhängigen Ansprüchen 2 - 6 charakterisiert.Further preferred embodiment variants of the bearing arrangement defined according to the invention or of the return arrangement defined according to the invention are characterized in the dependent claims 2-6.

Bei einer Zahnradpumpe, beispielsweise mit zwei Rückführkanälen ist vorzugsweise die, der Lagerrückseite bzw. Niederdruckseite näherliegende Rückführbohrung für die Rückführung der niedrigviskosen Flüssigkeit reserviert. So wird diese näherliegende Rückführbohrung nach dem Umschalten vom Fördern eines hochviskosen Mediums auf das Fördern des niedrigviskosen Mediums geöffnet, welcher Rückführkanal nicht durch hochviskoses Medium "verstopft" ist. Um auf das oben angeführte Beispiel einer diskontinuierlichen Herstellung von Polyester zurückzukommen, wird dieser näherliegende Rückführkanal nach dem Umschalten auf Polymerisation bzw. Zirkulationsbetrieb geöffnet. Durch die Polymerisation steigt die Viskosität im zu zirkulierenden Polyester an, und nach dem Erreichen einer bestimmten Viskosität bzw. nach dem Erreichen eines bestimmten Differenzdruckes oder nach dem Rückumschalten auf Extrusionsbetrieb wird der näherliegende Rückfuhrkanal wieder geschlossen, damit kein hochviskoses Material in diesen eintreten kann. Das Schliessen und Oeffnen dieser näherliegenden Rückführbohrung kann hydraulisch, pneumatisch oder elektromotorisch, beispielsweise unter Verwendung eines Schrittmotores, erfolgen. Ob schlussendlich der kürzere Rückführkanal durch das Gleitlager hindurch verläuft oder durch das, das Gleitlager umgebende Gehäuse, ist beispielsweise von den geometrischen Gegebenheiten abhängig. In jedem Falle aber sind beide Ausführungsvarianten möglich.In the case of a gear pump, for example with two return channels, the return hole closer to the back of the bearing or the low-pressure side is preferably reserved for the return of the low-viscosity liquid. Thus, this closer return hole is opened after the switchover from conveying a highly viscous medium to conveying the low-viscosity medium, which return channel is not "blocked" by highly viscous medium. In order to come back to the above example of a discontinuous production of polyester, this closer return channel is opened after switching to polymerization or circulation mode. The polymerization increases the viscosity in the polyester to be circulated, and after reaching a certain viscosity or after reaching a certain differential pressure or after switching back to extrusion operation, the nearer return duct is closed again so that no highly viscous material can enter it. This closer return hole can be closed and opened hydraulically, pneumatically or by electric motor, for example using a stepper motor. Whether the shorter return channel ultimately runs through the slide bearing or through the housing surrounding the slide bearing depends, for example, on the geometric conditions. In any case, both versions are possible.

Bei der Verwendung mehrerer nebeneinander angeordneter Gleitlager ist es selbstverständlich möglich, gleichartige Rückführkanäle, zumindest entlang eines gemeinsamen Abschnittes, zusammenzulegen, d.h., dass Rückführkanäle für niedrigviskose Medien zusammengelegt werden können und Rückführkanäle für hochviskose Medien.When using several slide bearings arranged next to one another, it is of course possible to combine return channels of the same type, at least along a common section, i.e. return channels for low-viscosity media can be combined and return channels for high-viscosity media.

Die Erfindung wird nun beispielsweise und unter Bezug auf die beigefügten Figuren näher erläutert. Dabei zeigt:

  • Fig. 1 im Längsschnitt durch eine Gehäusewandung ein Gleitlager und eine erfindungsgemäss ausgebildete Rückführanordnung,
  • Fig. 2 und Fig.3 weitere Ausführungsvarianten einer erfindungsgemässen Lageranordnung bzw. einer Rückführanordnung im Längsschnitt, und
  • Fig. 4 im Querschnitt zwei nebeneinander angeordnete Gleitlager einer Zahnradpumpe.
The invention will now be explained in more detail, for example, and with reference to the accompanying figures. It shows:
  • 1 in longitudinal section through a housing wall, a slide bearing and a feedback arrangement designed according to the invention,
  • 2 and FIG. 3 further embodiment variants of a bearing arrangement according to the invention or a return arrangement in longitudinal section, and
  • Fig. 4 in cross section two slide bearings of a gear pump arranged side by side.

In Fig. 1 ist schematisch im Längsschnitt ein Lager einer Antriebswelle 1 einer Zahnradpumpe dargestellt, verlaufend durch eine Gehausewandung 7. An der Welle 1 ist dabei im Pumpenraum 3 ein Zahnrad 5 angeordnet, vorgesehen, um eine viskose Flüssigkeit in Pfeilrichtung A zu fördern. Durch die Gehäusewandung 7 hindurch ist die Welle 1 in einem Gleitlager 9 gelagert, durch welches Lager hindurch, entlang der Welle 1, im Zwischenraum 10 infolge des hohen Druckes im Pumpenraum 3 das zu fördernde Medium getrieben wird. Diese sogenannte Leckageflüssigkeit dient gleichzeitig zum Schmieren des Gleitlagers 9. Auf der Rückseite des Gleitlagers 9 ist ein Auffang- bzw. Ringraum 11 angeordnet, um die durch das Gleitlager 9 hindurchtretende Leckageflüssigkeit aufzufangen. Erfindungsgemäss ist dieser Auffang- bzw. Ringraum 11 über zwei Rückführkanäle 13 und 15 mit der Saugseite des Pumpenraumes 3 verbunden. Um den näher an der Lagerrückseite geführten Rückführkanal 13 verschliessen zu können, ist weiter beispielsweise ein Ventil 17 vorgesehen.In Fig. 1, a bearing of a drive shaft 1 of a gear pump is shown schematically in longitudinal section, running through a housing wall 7. A gear 5 is arranged on the shaft 1 in the pump chamber 3 in order to convey a viscous liquid in the direction of arrow A. Through the housing wall 7, the shaft 1 is supported in a slide bearing 9, through which bearing, along the shaft 1, in the intermediate space 10 due to the high pressure in the pump chamber 3, the medium to be pumped is driven. This so-called leakage liquid also serves to lubricate the slide bearing 9. A collecting or annular space 11 is arranged on the back of the slide bearing 9 in order to collect the leakage liquid passing through the slide bearing 9. According to the invention, this collecting or annular space 11 is connected to the suction side of the pump space 3 via two return channels 13 and 15. In order to be able to close the return duct 13 guided closer to the rear of the bearing, a valve 17 is also provided, for example.

Fig. 2 zeigt analog im Längsschnitt eine weitere Ausführungsvariante eines erfindungsgemässen Lagers bzw. einer Rückführanordnung, wobei nun der Auffang- bzw. Ringraum 11 zumindest teilweise innerhalb der Rückseite des Gleitlagers 9 verlaufend angeordnet ist. Von diesem Ringraum 11 peripher, nach aussen verlaufend, sind wiederum die beiden Rückführkanäle 13 und 15 angeordnet, wobei infolge der Darstellung zumindest der je senkrecht zur Welle 1 verlaufende Ast 13a bzw. 15a jedes Rückführkanales als aufeinanderliegend erscheint. Die beiden Rückführkanalabschnitte 13a und 15a können auch in diesem Bereich unabhängig voneinander geführt werden, oder aber zusammengefasst sein. Dies deshalb, da die Abschnitte 13a und 15a sehr kurz sein können. Demgegenüber müssen aber die Rückführbohrungen 13 und 15, welche vergleichsweise lang sind, getrennt geführt werden.2 shows, analogously, in longitudinal section a further embodiment variant of a bearing according to the invention or a return arrangement, the collecting or annular space 11 now being arranged at least partially inside the rear of the sliding bearing 9. The two return channels 13 and 15 are in turn arranged peripherally from this annular space 11, running outwards, with the result that at least the branch 13a or 15a of each return channel, which runs perpendicular to the shaft 1, appears as lying one on top of the other. The two return duct sections 13a and 15a can also be guided independently of one another in this area, or they can be combined. This is because sections 13a and 15a can be very short. In contrast, the return holes 13 and 15, which are comparatively long, must be guided separately.

In Fig. 3 ist eine ähnlich Anordnung wie in Fig. 2 dargestellt, jedoch werden die Rückführkanalabschnitte 13a und 15a im Deckel 8 der Pumpe geführt. Diese Rückführkanalabschnitte 13a und 15a können beispielsweise durch eine sogenannte V-Nut gebildet werden. Diese V-Nut bzw. V-Nuten münden in den beiden, z.B. hintereinanderliegenden Rückführbohrungen 13 und 15, weshalb sie in der Darstellung gemäss Fig. 3 nicht als getrennt geführte Bohrungen erscheinen. Schliesslich ist in Fig. 3 im Deckel 8 eine Dichtungsanordnung 16 dargestellt.3 shows an arrangement similar to that in FIG. 2, but the return duct sections 13a and 15a are guided in the cover 8 of the pump. These return channel sections 13a and 15a can be formed, for example, by a so-called V-groove. This V-groove or V-grooves open into the two, e.g. return bores 13 and 15 lying one behind the other, which is why they do not appear as separately guided bores in the illustration according to FIG. 3. Finally, a sealing arrangement 16 is shown in the cover 8 in FIG. 3.

Fig. 4 schlussendlich zeigt zwei in derselben Gehäusewandung 7 nebeneinander angeordnete Gleitlager 9' und 9", durch welche die Wellen 1' bzw. 1" verlaufen. Beide Lager weisen an ihrer Rückseite je einen Auffang- bzw. Ringraum 11' bzw. 11" auf. Die von diesem Auffangring 11' bzw. 11" wegführenden Kanäle 13', 13", 15' und 15" werden je in einen gemeinsamen Rückführkanal 19 bzw. 21 geführt, durch welche beiden letzteren Kanäle das niederviskose Medium bzw. hochviskose Medium je saugseitig in die Pumpe zurückgeführt werden.4 finally shows two slide bearings 9 ′ and 9 ″ arranged next to one another in the same housing wall 7, through which the shafts 1 ′ and 1 ″ run. Both bearings each have a collecting or annular space 11 'or 11 "on their rear side. The channels 13', 13", 15 'and 15 "leading away from this collecting ring 11' or 11" are each in a common return channel 19 and 21 guided, through which two latter channels the low-viscosity medium or high-viscosity medium are fed back into the pump on the suction side.

Bei den in den Figuren 1 - 4 dargestellten, erfindungsgemässen Rückführanordnungen handelt es sich selbstverständlich nur um Beispiele, welche auf x-beliebige Art und Weise abgeändert, modifiziert oder ergänzt werden können. So ist es selbstverständlich möglich, weitere Rückführkanäle anzuordnen, und im Falle mehrerer Rückführkanäle auch mehr als einen Rückführkanal schliessbar auszubilden. Dies kann beispielsweise dann sinnvoll sein, wenn die Viskositäten der verschiedenen zu fördernden Flüssigkeiten stark voneinander abweichen. Auch die Verschliessbarkeit der Rückführkanäle kann auf verschiedene Art und Weise erreicht werden, doch handelt es sich hierbei um an sich bekanntes Know-how, das an dieser Stelle nicht näher zu erläutern ist. Auch ist es an sich unwesentlich, ob die Rückführkanäle teilweise durch die Lager selbst hindurch geführt werden oder aber durch die Gehäusewandung hindurch. Schlussendlich ist darauf hinzuweisen, dass auf die Darstellung der nachfolgend an den Auffang- bzw. Ringraum angrenzende Abdichtungsanordnung in den Figuren verzichtet worden ist, da diese nicht Teil der vorliegenden Erfindung ist.The return arrangements according to the invention shown in FIGS. 1-4 are of course only examples which can be modified, modified or supplemented in any manner. So it is of course possible to arrange further return channels and, in the case of several return channels, also to design more than one return channel to be closable. This can be useful, for example, if the viscosities of the different liquids to be pumped differ greatly. The sealability of the return channels can also be achieved in various ways, but this is know-how which is known per se and cannot be explained in more detail here. It is also in itself immaterial whether the return channels are partially passed through the bearings themselves or through the housing wall. Finally, it should be pointed out that the illustration of the sealing arrangement adjacent to the collecting or annular space has been omitted in the figures, since this is not part of the present invention.

Schliesslich ist darauf hinzuweisen, dass die erfindungsgemässe Anordnung wohl anhand einer Zahnradpumpe erläutert worden ist, dass aber selbstverständlich die erfindungsgemässe Anordnung überall dort zur Anwendung gelangen kann, wo Leckageflüssigkeiten abgeführt bzw. rückgeführt werden müssen.Finally, it should be pointed out that the arrangement according to the invention was probably explained using a gear pump, but that the arrangement according to the invention can of course be used wherever leakage liquids have to be removed or returned.

Erfindungswesentlich ist, dass das Abführ- bzw. Rückführsystem mindestens zwei Rückführkanäle bzw. Bohrungen, je Pumpenseite, aufweist.It is essential to the invention that the discharge or return system has at least two return channels or bores, on each pump side.

Claims (11)

1. Lageranordnung für eine Pumpenwelle (1) für das Fördern von newtonischen oder nichtnewtonischen Flüssigkeiten mit unterschiedlicher Viskosität mit einem Lager für die Welle, gekennzeichnet durch - mindestens eine an der Niderdruckseite des Lagers angeordnete Auffang- oder Entlastungszone (11) für das Auffangen von entlang der Welle durch das Lager (9) durchtretende Leckageflüssigkeit sowie durch - mindestens zwei die Auffang- oder Entlastungszone (11) mit der Saugseite der Pumpe verbindende Rückführkanäle oder -bohrungen (13, 15), um die aufgefangene Leckageflüssigkeit rückzuführen. 1. Bearing arrangement for a pump shaft (1) for the conveyance of Newtonian or non-Newtonian liquids with different viscosity with a bearing for the shaft, characterized by - At least one collecting or relief zone (11) arranged on the low pressure side of the bearing for collecting leakage liquid passing through the bearing (9) along the shaft and through - At least two return channels or bores (13, 15) connecting the collecting or relief zone (11) to the suction side of the pump in order to return the collected leakage fluid. 2. Lager, insbesondere nach Anspruch 1, dadurch gekennzeichnet, dass mindestens einer der Kanäle bzw. Bohrungen verschliessbar ist.2. Bearing, in particular according to claim 1, characterized in that at least one of the channels or bores can be closed. 3. Lager, insbesondere nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Kanäle bzw. Bohrungen unabhängig voneinander verschliessbar ausgebildet sind.3. Bearing, in particular according to claim 1 or 2, characterized in that the channels or bores are designed to be closable independently of one another. 4. Lager, insbesondere nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Kanäle bzw. Bohrungen einen unterschiedlichen Durchmesser bzw. Querschnitt aufweisen.4. Bearing, in particular according to one of claims 1 to 3, characterized in that the channels or bores have a different diameter or cross section. 5. Lager, insbesondere nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Auffang- bzw. Entlastungszone durch mindestens einen an die Welle angrenzenden Ringraum (11) gebildet wird.5. Bearing, in particular according to one of claims 1 to 4, characterized in that the collecting or relief zone is formed by at least one annular space (11) adjacent to the shaft. 6. Lager, insbesondere nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass mindestens ein Ringraum (11) an der Rückseite bzw. Niederdruckseite mindestens teilweise im Gleitlagerkörper (9) oder an oder im Pumpendeckel (8) verlaufend angeordnet ist und mindestens einer der Rückführkanäle bzw. Bohrungen (13) mindestens teilweise durch das oder entlang des Gleitlagergehäuse(s) hindurch verlaufend angeordnet ist.6. Bearing, in particular according to one of claims 1 to 5, characterized in that at least one annular space (11) on the back or low pressure side is arranged at least partially in the plain bearing body (9) or on or in the pump cover (8) and at least one the return channels or bores (13) are arranged to run at least partially through or along the slide bearing housing (s). 7. Zahnradpumpe mit einem oder mehreren Lagern nach einem der Ansprüche 1 bis 6.7. Gear pump with one or more bearings according to one of claims 1 to 6. 8. Zahnradpumpe, insbesondere nach Anspruch 7, dadurch gekennzeichnet, dass jeweils je zwei gleichartige Rückführkanäle bzw. Bohrungen (13', 13" und 15', 15") von je zwei nebeneinander in der Pumpengehäuse-Wandung angeordneten Lagern (9', 9") wenigstens teilweise zusammengelegt sind bzw. je einen gemeinsamen Abschnitt (19, 21) aufweisen.8. Gear pump, in particular according to claim 7, characterized in that in each case two identical return channels or bores (13 ', 13 "and 15', 15") of two bearings (9 ', 9) arranged next to one another in the pump housing wall ") are at least partially merged or each have a common section (19, 21). 9. Verfahren zum Auffangen von durch ein Lager nach einem der Ansprüche 1 bis 6 hindurchtretende Leckageflüssigkeit bei einem Pumpengleitlager und Rückführen der Leckageflüssigkeit in Pumpen für Flüssigkeiten mit unterschiedlicher Viskosität, dadurch gekennzeichnet, dass entlang der Welle durch das Lager tretende Leckageflüssigkeit mit einer bestimmten Viskosität an der Lagerrückseite bzw. -niederdruckseite an einer Auffang- bzw. Entlastungszone aufgefangen wird und über mindestens einen der Rückführkanäle auf die Saugseite der Pumpe rückgeführt wird, währenddem mindestens einer der weiteren Rückführkanäle beim Erreichen bzw. Ueberschreiten eines vorbestimmten Differenzdruckes in der Pumpe verschlossen bleibt.9. A method for collecting leakage liquid passing through a bearing according to one of claims 1 to 6 in a pump sliding bearing and returning the leakage liquid in pumps for liquids with different viscosities, characterized in that net that leakage liquid passing through the bearing with a certain viscosity on the back or low pressure side of the bearing is collected in a collecting or relief zone and is returned via at least one of the return channels to the suction side of the pump, while at least one of the others Return channels remain closed when a predetermined differential pressure in the pump is reached or exceeded. 10. Verfahren, insbesondere nach Anspruch 9, dadurch gekennzeichnet, dass beim Fördern von hochviskosen Medien mindestens einer der Rückführkanäle verschlossen bleibt, und beim Fördern von niedrigviskosen Medien, d.h. beim Unterschreiten eines vorbestimmten Differenzdruckes in der Pumpe, mindestens einer der weiteren verschlossenen Rückführkanäle geöffnet wird, um die Rückführung des niedrigviskosen Mediums von der Auffangzone in den saugseitigen Bereich der Pumpe sicherzustellen.10. The method, in particular according to claim 9, characterized in that when conveying highly viscous media at least one of the return channels remains closed, and when conveying low-viscosity media, i.e. when falling below a predetermined differential pressure in the pump, at least one of the further closed return channels is opened in order to ensure the return of the low-viscosity medium from the collecting zone to the suction-side area of the pump. 11. Verfahren, insbesondere nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass niedrigviskose Medien durch den oder die der Lagerrückseite bzw. -niederdruckseite näherliegenden Rückführkanal (-kanäle) rückgeführt werden, d.h. dass vorzugsweise der oder die der Lagerrückseite nächstgelegene(-n) Kanal (Kanäle) verschliessbar ausgebildet ist (sind).11. The method, in particular according to claim 9 or 10, characterized in that low-viscosity media are returned through the return channel (s) closer to the back or low pressure side, i.e. that preferably the channel (s) closest to the rear of the bearing is / are designed to be closable.
EP95107891A 1995-05-24 1995-05-24 Bearing arrangement for a viscous fluid pump Expired - Lifetime EP0669465B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
ES95107891T ES2110799T3 (en) 1995-05-24 1995-05-24 BEARING ARRANGEMENT FOR A SHAFT OF A PUMP TO IMPELLER MEDIA WITH DIFFERENT VISCOSITY.
DE59501083T DE59501083D1 (en) 1995-05-24 1995-05-24 Bearing arrangement for a pump shaft of a pump for conveying media with different viscosities
EP95107891A EP0669465B1 (en) 1995-05-24 1995-05-24 Bearing arrangement for a viscous fluid pump
AT95107891T ATE161075T1 (en) 1995-05-24 1995-05-24 BEARING ARRANGEMENT FOR A PUMP SHAFT OF A PUMP FOR DELIVERING MEDIA WITH DIFFERENT VISCOSITIES
JP8535234A JPH11505910A (en) 1995-05-24 1996-04-29 Bearing device for pump shaft of pump for conveying media with different viscosities
AU53304/96A AU5330496A (en) 1995-05-24 1996-04-29 Bearing system for the shaft of a pump for conveying media f differing viscosity
US08/952,649 US6123531A (en) 1995-05-24 1996-04-29 Bearing arrangement for a pump shaft of a pump for delivering media of different viscosities
PCT/CH1996/000164 WO1996037705A1 (en) 1995-05-24 1996-04-29 Bearing system for the shaft of a pump for conveying media of differing viscosity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95107891A EP0669465B1 (en) 1995-05-24 1995-05-24 Bearing arrangement for a viscous fluid pump

Publications (3)

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EP0669465A2 true EP0669465A2 (en) 1995-08-30
EP0669465A3 EP0669465A3 (en) 1995-12-20
EP0669465B1 EP0669465B1 (en) 1997-12-10

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EP95107891A Expired - Lifetime EP0669465B1 (en) 1995-05-24 1995-05-24 Bearing arrangement for a viscous fluid pump

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US (1) US6123531A (en)
EP (1) EP0669465B1 (en)
JP (1) JPH11505910A (en)
AT (1) ATE161075T1 (en)
AU (1) AU5330496A (en)
DE (1) DE59501083D1 (en)
ES (1) ES2110799T3 (en)
WO (1) WO1996037705A1 (en)

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DE19833374A1 (en) * 1998-07-24 2000-01-27 Zahnradfabrik Friedrichshafen Displacement pump for supplying fluid, with strip inserted into connecting channel to divide its cress section into several smaller ones
DE19835122A1 (en) * 1998-08-04 2000-02-10 Zahnradfabrik Friedrichshafen Vane cell pump for delivering pressure fluid from tank to user has housing containing rotor connected to drive shaft located in housing via shaft sealing ring
WO2002001072A1 (en) * 2000-06-28 2002-01-03 Coperion Werner & Pfleiderer Gmbh & Co. Kg Gear pump
EP1855007A1 (en) * 2006-05-12 2007-11-14 Maag Pump Systems Textron AG Gear pump
WO2012000812A2 (en) 2010-07-02 2012-01-05 Oerlikon Textile Gmbh & Co. Kg Gear pump
WO2018114332A1 (en) * 2016-12-21 2018-06-28 Robert Bosch Gmbh Fluid pump for a waste heat recovery system
EP3183458B1 (en) 2014-08-18 2018-08-01 GETRAG B.V. & Co. KG Fluid supply device for a transmission for a motor vehicle
EP3964689A1 (en) * 2020-09-08 2022-03-09 Eaton Intelligent Power Limited Gear pump with self-lubricating bearings

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US6544008B1 (en) * 1997-07-18 2003-04-08 John K. Apostolides Internal vent for reducing seal pressure in prelubrication pump assembly
DE10014548A1 (en) * 2000-03-23 2001-09-27 Bosch Gmbh Robert Gear pump for feeding liquid has connection between coupling cavity and compression cavity
US6685453B2 (en) 2001-06-14 2004-02-03 Parker-Hannifin Corporation Fluid transfer machine with drive shaft lubrication and cooling
KR100947715B1 (en) * 2007-05-07 2010-03-16 나종갑 Gear pump for ink
WO2010035916A1 (en) * 2008-09-25 2010-04-01 Jong-Gap Na Pump having bypass route
US11143183B2 (en) * 2019-03-26 2021-10-12 Hamilton Sundstrand Corporation Gear pump bearing with hybrid pad shutoff
EP3862532A1 (en) * 2020-02-07 2021-08-11 Fluid-O-Tech S.r.l. Pump particularly for pumping a liquid such as ink, paint, glue or the like

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DE19833374A1 (en) * 1998-07-24 2000-01-27 Zahnradfabrik Friedrichshafen Displacement pump for supplying fluid, with strip inserted into connecting channel to divide its cress section into several smaller ones
DE19833374B4 (en) * 1998-07-24 2007-03-22 Zf Friedrichshafen Ag displacement
DE19835122A1 (en) * 1998-08-04 2000-02-10 Zahnradfabrik Friedrichshafen Vane cell pump for delivering pressure fluid from tank to user has housing containing rotor connected to drive shaft located in housing via shaft sealing ring
WO2002001072A1 (en) * 2000-06-28 2002-01-03 Coperion Werner & Pfleiderer Gmbh & Co. Kg Gear pump
US6761546B2 (en) 2000-06-28 2004-07-13 Coperion Werner & Pfleiderer Gmbh & Co. Kg Gear pump having bearings with cooling ducts
EP1855007A1 (en) * 2006-05-12 2007-11-14 Maag Pump Systems Textron AG Gear pump
WO2012000812A2 (en) 2010-07-02 2012-01-05 Oerlikon Textile Gmbh & Co. Kg Gear pump
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WO2018114332A1 (en) * 2016-12-21 2018-06-28 Robert Bosch Gmbh Fluid pump for a waste heat recovery system
EP3964689A1 (en) * 2020-09-08 2022-03-09 Eaton Intelligent Power Limited Gear pump with self-lubricating bearings
US11703050B2 (en) 2020-09-08 2023-07-18 Eaton Intelligent Power Limited Gear pump with self-lubricating bearings

Also Published As

Publication number Publication date
EP0669465B1 (en) 1997-12-10
ATE161075T1 (en) 1997-12-15
JPH11505910A (en) 1999-05-25
WO1996037705A1 (en) 1996-11-28
ES2110799T3 (en) 1998-02-16
DE59501083D1 (en) 1998-01-22
US6123531A (en) 2000-09-26
EP0669465A3 (en) 1995-12-20
AU5330496A (en) 1996-12-11

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