EP1466099B1 - Fuel pump - Google Patents

Fuel pump Download PDF

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Publication number
EP1466099B1
EP1466099B1 EP02795028A EP02795028A EP1466099B1 EP 1466099 B1 EP1466099 B1 EP 1466099B1 EP 02795028 A EP02795028 A EP 02795028A EP 02795028 A EP02795028 A EP 02795028A EP 1466099 B1 EP1466099 B1 EP 1466099B1
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EP
European Patent Office
Prior art keywords
pump
coating
impeller
drive shaft
chamber
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 - Fee Related
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EP02795028A
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German (de)
French (fr)
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EP1466099A1 (en
Inventor
Christoph Schmidt
Bernd Wehrum
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Siemens AG
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Siemens AG
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Publication of EP1466099A1 publication Critical patent/EP1466099A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/20—Oxide or non-oxide ceramics
    • F05D2300/22—Non-oxide ceramics
    • F05D2300/228—Nitrides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/611—Coating

Definitions

  • the invention relates to a pump, in particular a fuel pump, with a pump housing, in which a pump chamber is formed, leads to an inlet and leads away from an outlet, with an arranged in the pump chamber impeller mounted on a rotatably driven drive shaft is, which is rotatably mounted in bearings in the pump housing.
  • the object of the invention is therefore to provide a pump of the type mentioned, which is simple in construction and low-wear and ensures a high pressure build-up permanently.
  • This object is achieved in that abutting surfaces of the impeller surfaces of the pump chamber and / or surfaces of the pump chamber surfaces of the impeller applied by physical deposition from the gas phase coating small thickness and high hardness and / or that the drive shaft in bearing bores the pump housing are rotatably mounted, wherein the bearing bores and / or the drive shaft have a deposited by physical deposition of the gas phase coating of small thickness and high hardness.
  • the thin coating can be applied with an exactly uniform thickness and thus allows compliance with low tolerances, so that a good pressure build-up of the pump is ensured.
  • the coating builds up with a uniform layer growth of dense structure and smooth surface, which further leads to good corrosion protection and allows the use of the pump for a wide variety of fuel types and other fluids.
  • the high hardness ensures the coating against wear and ensures a long service life of the pump.
  • This hardness may preferably be in a range of 2500 HV to 3500 HV (Vickers hardness) but also above or below.
  • the coating can be applied to a wide variety of materials, the optimum materials and material pairings can be used for the pump housing and impeller.
  • the application of the layer takes place in a manner that does not pollute the environment.
  • the entire surface of the pump chamber may be provided with a deposited by physical vapor deposition coating, preferably also the surfaces of the fuel-carrying parts of the pump with a by physical deposition from the Gas phase applied coating are provided.
  • the pump can also pump aggressive media without causing any damage.
  • the coating has a thickness of about 2 microns to about 5 microns.
  • a layer thickness of 2 microns for wear protection is completely sufficient while 5 microns are preferable for corrosion protection.
  • the coating is preferably a chromium-nitride layer.
  • Pump housing and / or impeller may be made of metal or a metal alloy, in particular aluminum or an aluminum alloy, which are wear resistant and corrosion resistant by the coating, but the ease of manufacture and low weight are maintained.
  • pump housing and / or impeller made of a plastic, in particular a phenolic resin.
  • Even lightweight parts which can be produced as easily as injection-molded parts become wear-resistant by the coating and are resistant to aggressive fluids.
  • the pump housing consists of coated aluminum and the impeller made of phenolic resin.
  • the impeller made of phenolic resin may be coated or even uncoated.
  • the illustrated pump is a two-stage fuel pump.
  • a drive shaft 2 can be driven in a rotatable manner by an electric motor arranged in the closed motor housing 1.
  • a first impeller 3 of a Peripheralradpumpe 14 is arranged rotationally fixed.
  • the radially circumferential region of the first impeller 3 is formed with a first blade ring, which is largely enclosed by an annular channel.
  • a first pump chamber 5 is formed as a cup-shaped recess 31 in the one end side of a lid 6, which is a part of the pump housing 7.
  • a ball 9 is centrally arranged in a receptacle on the side of the first impeller 3 in the cover 6, on which the drive shaft 2 is supported on the front side and which forms a thrust bearing of the drive shaft 2.
  • the first pump chamber 5 By a voltage applied to the mouth opening of the cup-shaped recess 31 of the lid 6 intermediate wall 10, through which the drive shaft is passed, the first pump chamber 5 is closed.
  • the drive shaft 2 is guided through a bearing bore 11 in the part of the pump housing 7 forming intermediate wall 10 and mounted directly rotatably in this bearing bore 11.
  • the first pump chamber 5 is connected to a radially encircling annular channel 12 on the side facing the Peripheralradpumpe 14 side in the intermediate wall 10, from which a connection 13 leads to the Peripheralradpumpe 14 opposite side of the intermediate wall 10 and in there a ring trained first side channel 15, a side channel pump 16 opens.
  • the intermediate wall 10 is also formed on the side of the first side channel 15 with a cup-shaped recess 17 which forms a second pump chamber and in which a second impeller 18 of the side channel pump 16 is arranged, which also rotatably seated on the drive shaft 2.
  • the second impeller 18 has in its one side surface covering with the first side channel 16 a second blade ring 19, which is connected via axial openings 20 with a third blade ring 21 on the other side surface of the impeller 18.
  • the third blade ring 21 is covered by an annular second side channel 22, which is formed in a partition wall 23 which closes the pot-shaped opening 14, forms part of the pump housing 7 and is passed through a drive shaft 2.
  • the partition wall 23 separates the side channel pump 16 from the motor housing 1, wherein the outlet 24 formed in the partition wall 23 opens into the motor housing 1.
  • the delivered fuel flows through the motor housing 1 and is fed via a check valve 25 to a pressure port 26 of the fuel pump, which are arranged in a closure wall 29. Also in the closure wall 29 is a plug contact 30 of the power supply of the electric motor.
  • a bearing wall 27 is arranged coaxially with the first bearing bore 11 has a second bearing bore 28 in which the left end of the drive shaft 2 is mounted directly rotatably.
  • the two impellers 3 and 18 are made of phenolic resin.
  • the parts of the pump housing 7 are formed of aluminum.
  • the cover 6 has in all the intermediate wall 10 facing areas and in the inlet 8 a coating of chromium nitride.
  • the intermediate wall 10, the partition wall 23 and the bearing wall 27 are completely provided with a coating of chromium nitride.
  • the surfaces of the closure wall 29 and the pressure connection 26 flushed around by the fuel are also coated with chromium nitride.
  • the cylindrical inner walls of the first and second bearing bores 11 and 28 are coated.
  • the steel drive shaft 2 has a chromium nitride coating in its portions located in the bearing bores 11 and 28.
  • chromium-nitride coatings are deposited by physical vapor deposition and have a thickness of 5 ⁇ m and a Vickers hardness of about 2500 HV.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressor (AREA)

Description

Die Erfindung bezieht sich auf eine Pumpe, insbesondere eine Kraftstoffpumpe, mit einem Pumpengehäuse, in dem eine Pumpenkammer ausgebildet ist, zu der eine Einlass hinführt und von der ein Auslass wegführt, mit einem in der Pumpenkammer angeordneten Pumpenrad, das auf einer drehbar antreibbaren Antriebswelle befestigt ist, die in Lagern im Pumpengehäuse drehbar gelagert ist.The invention relates to a pump, in particular a fuel pump, with a pump housing, in which a pump chamber is formed, leads to an inlet and leads away from an outlet, with an arranged in the pump chamber impeller mounted on a rotatably driven drive shaft is, which is rotatably mounted in bearings in the pump housing.

Bei derartigen aggressive Flüssigkeiten wie z.B. Kraftstoffe fördernden Pumpen ist es bekannt, deren Innenteile mit einer Eloxal-Schicht als Korrosionsschutz zu versehen.In such aggressive fluids as e.g. Fuels pumping, it is known to provide their internal parts with an anodized coating as corrosion protection.

In zunehmendem Maß weisen heute die Kraftstoffe Verschmutzungen auf, die zwischen den relativ zueinander bewegten Teilen der Pumpen zu Verschleiß führen sowie die Eloxal-Schicht beschädigen. Verunreingungen der Kraftstoffe durch Wasser oder chemisch ähnlich reagierende Stoffe sowie Zusätze der Kraftstoffe der verschiedensten Art können dann zu weiteren Beschädigungen der Pumpenteile führen.Increasingly, today the fuels have soiling, which lead to wear between the relatively moving parts of the pump and damage the anodized layer. Contamination of the fuels by water or chemically similar substances and additives of fuels of various kinds can then lead to further damage to the pump parts.

Bei Pumpenbauteilen aus Aluminium führen hoch alkoholhaltige Kraftstoffe zur Oxydation und damit zu Ausblühungen und im weiteren zu einer Blockade des Pumpenrads. Eine solche Blokkade kann auch durch die Verschmutzungen geschehen.In pump components made of aluminum lead highly alcoholic fuels for oxidation and thus efflorescence and further to a blockage of the impeller. Such a blockage can also be done by the contaminants.

Sehr geringe Spalte sind aber zwischen den beweglichen und den feststehenden Pumpenteilen erforderlich, damit ein ausreichender Druckaufbau insbesondere bei einer als Strömungspumpe aufgebauten Pumpe möglich ist.However, very small gaps are required between the movable and the fixed pump parts, so that a sufficient pressure build-up is possible, in particular in the case of a pump designed as a flow pump.

Weitere Nachteile der Eloxal-Schicht sind deren hohe Kosten, deren Umweltunverträglichkeit sowie deren große Dicke von etwa 30 µm, die zu großen Toleranzen führt. Diese großen Toleranzen ermöglichen wiederum keinen zufriedenstellenden Druckaufbau der Pumpe.Other disadvantages of the anodized coating are their high costs, their environmental incompatibility and their large thickness of about 30 μm, which leads to large tolerances. These large tolerances in turn do not allow a satisfactory pressure build-up of the pump.

Zur Lagerung und Führung der Antriebswelle sind in Lagerbohrungen des Pumpengehäuses Lager in Form von z. B. Kohlebuchsen angeordnet. Dies ist montage- und bauteilaufwendig.For storage and management of the drive shaft bearings are in the bearing bores of the pump housing in the form of z. B. coal bushes arranged. This is complicated assembly and component.

Aus der US 2001/0004435 A1 ist eine Pumpe der eingangs genannten Art bekannt.From US 2001/0004435 A1 a pump of the type mentioned is known.

Weiterhin ist es aus der DE 44 20 262 A1 bekannt mechanische Teile mit verschiebbaren Elementen von Kraftstoff-Einspritzpumpen durch chemische Abscheidung aus der Gasphase mit einem amorphen harten Kohlenstoff-Film zu beschichten, um eine Reduzierung des Verschleißverlustes und Erzielung guter Reibeigenschaften zu erreichen.Furthermore, it is known from DE 44 20 262 A1 to coat mechanical parts with displaceable elements of fuel injection pumps by chemical vapor deposition with an amorphous hard carbon film in order to achieve a reduction of the wear loss and to achieve good friction properties.

Aufgabe der Erfindung ist es daher eine Pumpe der eingangs genannten Art zu schaffen, die einfach aufgebaut und verschleißarm ausgebildet ist und einen hohen Druckaufbau dauerhaft gewährleistet.The object of the invention is therefore to provide a pump of the type mentioned, which is simple in construction and low-wear and ensures a high pressure build-up permanently.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass an Oberflächen des Pumpenrads anliegende Oberflächen der Pumpenkammer und/oder an Oberflächen der Pumpenkammer anliegende Oberflächen des Pumpenrads eine durch physikalische Abscheidung aus der Gasphase aufgebrachte Beschichtung geringer Dicke und großer Härte besitzen und/oder dass die Antriebswelle in Lagerbohrungen des Pumpengehäuses drehbar gelagert sind, wobei die Lagerbohrungen und/oder die Antriebswelle eine durch physikalische Abscheidung aus der Gasphase aufgebrachte Beschichtung geringer Dicke und großer Härte besitzen.This object is achieved in that abutting surfaces of the impeller surfaces of the pump chamber and / or surfaces of the pump chamber surfaces of the impeller applied by physical deposition from the gas phase coating small thickness and high hardness and / or that the drive shaft in bearing bores the pump housing are rotatably mounted, wherein the bearing bores and / or the drive shaft have a deposited by physical deposition of the gas phase coating of small thickness and high hardness.

Die dünne Beschichtung ist mit exakt gleichmäßiger Dicke auftragbar und ermöglicht so die Einhaltung geringer Toleranzen, so dass ein guter Druckaufbau der Pumpe gewährleistet ist.The thin coating can be applied with an exactly uniform thickness and thus allows compliance with low tolerances, so that a good pressure build-up of the pump is ensured.

Dazu trägt ebenfalls bei, dass der Aufbau der Beschichtung mit einem gleichmäßigen Schichtwachstum von dichter Struktur und glatter Oberfläche erfolgt, was weiterhin zu einem guten Korrosionsschutz führt und den Einsatz der Pumpe für die unterschiedlichsten Kraftstoffarten und andere Fördermedien ermöglicht.Another contributing factor is that the coating builds up with a uniform layer growth of dense structure and smooth surface, which further leads to good corrosion protection and allows the use of the pump for a wide variety of fuel types and other fluids.

Die große Härte sichert die Beschichtung gegen Verschleiß und gewährleistet eine hohe Lebensdauer der Pumpe. Dabei kann diese Härte vorzugsweise in einem Bereich von 2500 HV bis 3500 HV (Vickershärte) aber auch darüber oder darunter liegen.The high hardness ensures the coating against wear and ensures a long service life of the pump. This hardness may preferably be in a range of 2500 HV to 3500 HV (Vickers hardness) but also above or below.

Da nur niedrige Verfahrenstemperaturen bei der Erzeugung der Beschichtung erforderlich sind, kommt es nicht zu einem Verziehen der beschichteten Bauteile und zu Materialveränderungen wie Gefügeveränderungen an diesen Bauteilen.Since only low process temperatures are required in the production of the coating, there is no warping of the coated components and material changes such as structural changes to these components.

Da weiterhin die Beschichtung auf die unterschiedlichsten Materiälen aufgebracht werden kann, können für Pumpengehäuse und Pumpenrad die jeweils optimalen Werkstoffe und Werkstoffpaarungen angewandt werden.Furthermore, since the coating can be applied to a wide variety of materials, the optimum materials and material pairings can be used for the pump housing and impeller.

Das Aufbringen der Schicht erfolgt auf eine die Umwelt nicht belastende Art und Weise.The application of the layer takes place in a manner that does not pollute the environment.

Durch die sehr harte und glatte Oberfläche der Beschichtung von Lagerbohrung und/oder Antriebswelle sowie den engen Toleranzen diese Teile werden die positiven Eigenschaften einer Kohlebuchse als Lager direkt in die einfache Lagerbohrung verlagert. Damit können separate Lager sowie deren Bearbeitung eingespart werden. Ist die Pumpe eine Strömungspumpe, so sind die bei Strömungspumpen für den Druckaufbau unbedingt erforderlichen engen Toleranzen der Bauteile und damit geringen Spalte zwischen den relativ zueinander bewegten Bauteilen minimierbar.Due to the very hard and smooth surface of the bearing bore and / or drive shaft coating and the tight tolerances of these parts, the positive properties of a carbon bushing as a bearing are shifted directly into the simple bearing bore. Thus, separate bearings and their processing can be saved. If the pump is a flow pump, the tight tolerances of the components which are absolutely necessary in the case of flow pumps for pressure build-up and thus small gaps between the components moving relative to one another can be minimized.

Dies ist insbesondere von Vorteil, wenn die Strömungspumpe eine Peripheralrad- oder Seitenkanalpumpe ist.This is particularly advantageous when the flow pump is a Peripheralrad- or side channel pump.

Über die aneinander anliegenden Oberflächen von Pumpenrad und Pumpenkammer hinaus, kann die gesamte Oberfläche der Pumpenkammer mit einer durch physikalische Abscheidung aus der Gasphase aufgebrachten Beschichtung versehen sein, wobei vorzugsweise auch die Oberflächen der Kraftstoff führenden Teile der Pumpe mit einer durch physikalische Abscheidung aus der Gasphase aufgebrachten Beschichtung versehen sind. Damit können durch die Pumpe auch aggressive Medien gefördert werden, ohne dass es zu Beschädigungen kommt.In addition to the abutting surfaces of impeller and pump chamber, the entire surface of the pump chamber may be provided with a deposited by physical vapor deposition coating, preferably also the surfaces of the fuel-carrying parts of the pump with a by physical deposition from the Gas phase applied coating are provided. As a result, the pump can also pump aggressive media without causing any damage.

Die Gewährleistung der engen Herstellungstoleranzen ist dadurch möglich, dass die Beschichtung eine Dicke von etwa 2 µm bis etwa 5 µm aufweist. Dabei ist eine Schichtdicke von 2 µm für einen Verschleißschutz völlig ausreichend während für einen Korrosionsschutz 5 µm vorzuziehen sind.Ensuring the tight manufacturing tolerances is possible because the coating has a thickness of about 2 microns to about 5 microns. In this case, a layer thickness of 2 microns for wear protection is completely sufficient while 5 microns are preferable for corrosion protection.

Insbesondere bei der Verwendung der Pumpe als Kraftstoffpumpe ist die Beschichtung vorzugsweise eine Chrom-Nitrid-Schicht.In particular, when using the pump as a fuel pump, the coating is preferably a chromium-nitride layer.

Pumpengehäuse und/oder Pumpenrad können aus Metall oder einer Metalllegierung, insbesondere aus Aluminium oder einer Aluminiumlegierung bestehen, die durch die Beschichtung verschleißfest und korrosionsbeständig werden, wobei aber die leichte Herstellbarkeit und das geringe Gewicht beibehalten werden.Pump housing and / or impeller may be made of metal or a metal alloy, in particular aluminum or an aluminum alloy, which are wear resistant and corrosion resistant by the coating, but the ease of manufacture and low weight are maintained.

Eine andere Möglichkeit besteht darin, dass Pumpengehäuse und/oder Pumpenrad aus einem Kunststoff, insbesondere einem Phenolharz bestehen. Auch derart leicht als Spritzgussteile herstellbare Teile geringen Gewichts werden durch die Beschichtung verschleißfest und beständig gegen aggressive Fördermedien.Another possibility is that pump housing and / or impeller made of a plastic, in particular a phenolic resin. Even lightweight parts which can be produced as easily as injection-molded parts become wear-resistant by the coating and are resistant to aggressive fluids.

Eine besonders günstige Werkstoffpaarung besteht darin, dass das Pumpengehäuse aus beschichtetem Aluminium und das Pumpenrad aus Phenolharz besteht. Dabei kann das aus Phenolharz bestehende Pumpenrad beschichtet oder auch unbeschichtet sein.A particularly favorable combination of materials is that the pump housing consists of coated aluminum and the impeller made of phenolic resin. The impeller made of phenolic resin may be coated or even uncoated.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Die einzige Figur der Zeichnung zeigt eine Kraftstoffpumpe mit Strömungspumpen als Pumpenstufen.An embodiment of the invention is illustrated in the drawing and will be described in more detail below. The sole figure of the drawing shows a fuel pump with flow pumps as pump stages.

Die dargestellte Pumpe ist eine zweistufige Kraftstoffpumpe. Von einem in dem geschlossen dargestellten Motorgehäuse 1 angeordneten Elektromotor ist eine Antriebswelle 2 drehbar antreibbar, auf deren rechtem Endbereich ein ersten Pumpenrad 3 einer Peripheralradpumpe 14 drehfest angeordnet ist. Der radial umlaufende Bereich des ersten Pumpenrads 3 ist mit einem ersten Schaufelkranz ausgebildet, der von einem ringförmigen Kanal weitgehend umschlossen ist. Eine erste Pumpenkammer 5 ist als topfförmige Ausnehmung 31 in der einen Stirnseite eines Deckels 6 ausgebildet, der ein Teil des Pumpengehäuses 7 ist.The illustrated pump is a two-stage fuel pump. A drive shaft 2 can be driven in a rotatable manner by an electric motor arranged in the closed motor housing 1. on the right end portion of a first impeller 3 of a Peripheralradpumpe 14 is arranged rotationally fixed. The radially circumferential region of the first impeller 3 is formed with a first blade ring, which is largely enclosed by an annular channel. A first pump chamber 5 is formed as a cup-shaped recess 31 in the one end side of a lid 6, which is a part of the pump housing 7.

In dem Pumpendeckel 7 befindet sich ein Einlass 8, über den die Peripheralradpumpe Kraftstoff ansaugen kann. Weiterhin ist zentrisch eine Kugel 9 in einer Aufnahme auf der Seite des ersten Pumpenrads 3 im Deckel 6 angeordnet, an der die Antriebswelle 2 stirnseitig abgestützt ist und die ein Axiallager der Antriebswelle 2 bildet.In the pump cover 7 there is an inlet 8, via which the peripheral wheel pump can suck in fuel. Furthermore, a ball 9 is centrally arranged in a receptacle on the side of the first impeller 3 in the cover 6, on which the drive shaft 2 is supported on the front side and which forms a thrust bearing of the drive shaft 2.

Durch eine an der Mündungsöffnung der topfförmigen Ausnehmung 31 des Deckels 6 anliegenden Zwischenwand 10, durch die die Antriebswelle hindurchgeführt ist, ist die erste Pumpenkammer 5 geschlossen. Die Antriebswelle 2 ist dabei durch eine Lagerbohrung 11 in der ebenfalls ein Teil des Pumpengehäuses 7 bildenden Zwischenwand 10 hindurchgeführt und in dieser Lagerbohrung 11 unmittelbar drehbar gelagert.By a voltage applied to the mouth opening of the cup-shaped recess 31 of the lid 6 intermediate wall 10, through which the drive shaft is passed, the first pump chamber 5 is closed. The drive shaft 2 is guided through a bearing bore 11 in the part of the pump housing 7 forming intermediate wall 10 and mounted directly rotatably in this bearing bore 11.

In einer nicht sichtbaren Ebene ist die erste Pumpenkammer 5 mit einem radial umlaufenden Ringkanal 12 auf der der Peripheralradpumpe 14 zugewandten Seite in der Zwischenwand 10 verbunden, von dem eine Verbindung 13 zu der der Peripheralradpumpe 14 abgewandten Seite der Zwischenwand 10 führt und in einen dort ringförmig ausgebildeten ersten Seitenkanal 15 eine Seitenkanalpumpe 16 mündet.In a non-visible plane, the first pump chamber 5 is connected to a radially encircling annular channel 12 on the side facing the Peripheralradpumpe 14 side in the intermediate wall 10, from which a connection 13 leads to the Peripheralradpumpe 14 opposite side of the intermediate wall 10 and in there a ring trained first side channel 15, a side channel pump 16 opens.

Die Zwischenwand 10 ist auf der Seite des ersten Seitenkanals 15 ebenfalls mit einer topfförmigen Ausnehmung 17 ausgebildet, die eine zweite Pumpenkammer bildet und in der ein zweites Pumpenrad 18 der Seitenkanalpumpe 16 angeordnet ist, das ebenfalls drehfest auf der Antriebswelle 2 sitzt.The intermediate wall 10 is also formed on the side of the first side channel 15 with a cup-shaped recess 17 which forms a second pump chamber and in which a second impeller 18 of the side channel pump 16 is arranged, which also rotatably seated on the drive shaft 2.

Das zweite Pumpenrad 18 besitzt in seiner einen Seitenfläche überdeckend mit dem ersten Seitenkanal 16 einen zweiten Schaufelkranz 19, der über axiale Durchbrüche 20 mit einem dritten Schaufelkranz 21 auf der anderen Seitenfläche des Pumpenrads 18 verbunden ist.The second impeller 18 has in its one side surface covering with the first side channel 16 a second blade ring 19, which is connected via axial openings 20 with a third blade ring 21 on the other side surface of the impeller 18.

Der dritte Schaufelkranz 21 wird von einem ringförmigen zweiten Seitenkanal 22 überdeckt, der in einer Trennwand 23 ausgebildet ist, die die topfförmige Öffnung 14 verschließt, einen Teil des Pumpengehäuses 7 bildet und durch eine Antriebswelle 2 hindurchgeführt ist.The third blade ring 21 is covered by an annular second side channel 22, which is formed in a partition wall 23 which closes the pot-shaped opening 14, forms part of the pump housing 7 and is passed through a drive shaft 2.

Die Trennwand 23 trennt die Seitenkanalpumpe 16 von dem Motorgehäuse 1, wobei der in der Trennwand 23 ausgebildete Auslass 24 in das Motorgehäuse 1 mündet. Der geförderte Kraftstoff durchströmt das Motorgehäuse 1 und wird über ein Rückschlagventil 25 einem Druckanschluss 26 der Kraftstoffpumpe zugeführt, die in einer Verschlusswand 29 angeordnet sind. Ebenfalls in der Verschlusswand 29 befindet sich ein Steckkontakt 30 der Stromversorgung des Elektromotors.The partition wall 23 separates the side channel pump 16 from the motor housing 1, wherein the outlet 24 formed in the partition wall 23 opens into the motor housing 1. The delivered fuel flows through the motor housing 1 and is fed via a check valve 25 to a pressure port 26 of the fuel pump, which are arranged in a closure wall 29. Also in the closure wall 29 is a plug contact 30 of the power supply of the electric motor.

In dem Endbereich des Motorgehäuses 1 auf der Seite des Druckanschlusses 26 ist eine Lagerwand 27 angeordnet, die koaxial zur ersten Lagerbohrung 11 eine zweite Lagerbohrung 28 aufweist, in der das linke Ende der Antriebswelle 2 unmittelbar drehbar gelagert ist.In the end region of the motor housing 1 on the side of the pressure port 26, a bearing wall 27 is arranged coaxially with the first bearing bore 11 has a second bearing bore 28 in which the left end of the drive shaft 2 is mounted directly rotatably.

Die beiden Pumpenräder 3 und 18 bestehen aus Phenolharz.The two impellers 3 and 18 are made of phenolic resin.

Die Teile des Pumpengehäuses 7 sind aus Aluminium ausgebildet. Dabei besitzt der Deckel 6 in allen der Zwischenwand 10 zugewandten Bereichen sowie im Einlass 8 eine Beschichtung aus Chrom-Nitrid. Die Zwischenwand 10, die Trennwand 23 und die Lagerwand 27 sind vollständig mit einer Beschichtung aus Chrom-Nitrid versehen. Weiterhin sind auch die vom Kraftstoff umspülten Flächen der Verschlusswand 29 und des Druckanschlusses 26 mit Chrom-Nitrid beschichtet.The parts of the pump housing 7 are formed of aluminum. In this case, the cover 6 has in all the intermediate wall 10 facing areas and in the inlet 8 a coating of chromium nitride. The intermediate wall 10, the partition wall 23 and the bearing wall 27 are completely provided with a coating of chromium nitride. Furthermore, the surfaces of the closure wall 29 and the pressure connection 26 flushed around by the fuel are also coated with chromium nitride.

Dabei sind auch die zylindrischen Innenwände der ersten und zweiten Lagerbohrung 11 und 28 beschichtet. Zusätzlich besitzt die aus Stahl bestehende Antriebswelle 2 in ihren in den Lagerbohrungen 11 und 28 befindlichen Bereichen eine Chrom-Nitrid-Beschichtung.In this case, the cylindrical inner walls of the first and second bearing bores 11 and 28 are coated. In addition, the steel drive shaft 2 has a chromium nitride coating in its portions located in the bearing bores 11 and 28.

Diese Chrom-Nitrid-Beschichtungen sind durch physikalische Abscheidungen aus der Gasphase aufgebracht und haben eine Dicke von 5 µm sowie eine Vickershärte von etwa 2500 HV.These chromium-nitride coatings are deposited by physical vapor deposition and have a thickness of 5 μm and a Vickers hardness of about 2500 HV.

Claims (9)

  1. Pump, in particular a fuel pump, having a pump casing, in which a pump chamber is formed, which has an inlet leading to it and an outlet leading away from it, having a pump impeller which is arranged in the pump chamber and is secured to a drive shaft, which can be driven in rotation and is mounted rotatably in bearings in the pump casing, characterized in that surfaces of the pump chamber (5) which bear against surfaces of the pump impeller (3, 18) and/or surfaces of the pump impeller (3, 18) which bear against surfaces of the pump chamber (5) have a coating of low thickness and high hardness which is applied by physical vapour deposition and/or in that the drive shaft (2) is rotatably mounted in bearing bores (11, 28) in the pump casing (7), the bearing bores (11, 28) and/or the drive shaft (2) having a coating of low thickness and high hardness which is applied by physical vapour deposition.
  2. Pump according to Claim 1, characterized in that the pump is a flow pump.
  3. Pump according to Claim 2, characterized in that the flow pump is a peripheral impeller or side channel pump (14, 16).
  4. Pump according to one of the preceding claims, characterized in that the surface of the pump chamber (5) is provided with a coating which is applied by physical vapour deposition.
  5. Pump according to one of the preceding claims, characterized in that the surfaces of the fuel-carrying parts of the pump are provided with a coating which is applied by physical vapour deposition.
  6. Pump according to one of the preceding claims, characterized in that the coating has a thickness of approximately 2 µm to approximately 5 µm.
  7. Pump according to one of the preceding claims, characterized in that the coating is a chromium nitride layer.
  8. Pump according to one of the preceding claims, characterized in that the pump casing (7) and/or pump impeller consist of metal or a metal alloy.
  9. Pump according to one of the preceding claims, characterized in that the pump casing and/or pump impeller (3, 18) consist of a plastic.
EP02795028A 2002-01-15 2002-12-20 Fuel pump Expired - Fee Related EP1466099B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10201405A DE10201405A1 (en) 2002-01-15 2002-01-15 Pump for pumping fuel has a pump casing with a pumping chamber fitted with inlets and outlets as well as a pumping wheel in the chamber fastened on a drive shaft rotating on bearings in the casing.
DE10201405 2002-01-15
PCT/DE2002/004702 WO2003060328A1 (en) 2002-01-15 2002-12-20 Fuel pump

Publications (2)

Publication Number Publication Date
EP1466099A1 EP1466099A1 (en) 2004-10-13
EP1466099B1 true EP1466099B1 (en) 2007-03-21

Family

ID=7712249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02795028A Expired - Fee Related EP1466099B1 (en) 2002-01-15 2002-12-20 Fuel pump

Country Status (7)

Country Link
US (1) US20030175110A1 (en)
EP (1) EP1466099B1 (en)
CN (1) CN1589373A (en)
BR (1) BR0215501B1 (en)
DE (2) DE10201405A1 (en)
ES (1) ES2280609T3 (en)
WO (1) WO2003060328A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1873399B1 (en) * 2006-06-29 2012-12-05 Grundfos Management A/S Centrifugal pump unit
WO2010133868A1 (en) * 2009-05-20 2010-11-25 Edwards Limited Regenerative vacuum pump with axial thrust balancing means
JP5385873B2 (en) * 2010-08-11 2014-01-08 日立アプライアンス株式会社 Refrigerant compressor
CN102649915B (en) 2011-02-28 2015-08-26 通用电气公司 The method of the wear resistance of the pump used in gasification installation and this pump

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4792353A (en) * 1986-10-10 1988-12-20 Massachusetts Institute Of Technology Aluminum oxide-metal compositions
DE4134875C2 (en) * 1991-10-23 2000-04-20 Mannesmann Vdo Ag Fuel delivery system
US5449547A (en) * 1993-03-15 1995-09-12 Teikoku Piston Ring Co., Ltd. Hard coating material, sliding member coated with hard coating material and method for manufacturing sliding member
DE19539909B4 (en) * 1995-07-27 2005-02-10 Aisan Kogyo K.K., Obu Peripheral
US5549446A (en) * 1995-08-30 1996-08-27 Ford Motor Company In-tank fuel pump for highly viscous fuels
JPH09112448A (en) * 1995-10-18 1997-05-02 Matsushita Electric Ind Co Ltd Scroll compressor
AUPO902797A0 (en) * 1997-09-05 1997-10-02 Cortronix Pty Ltd A rotary blood pump with hydrodynamically suspended impeller
JP3924999B2 (en) * 1999-08-12 2007-06-06 株式会社日立製作所 Fuel pump and in-cylinder injection engine using the same
US6402460B1 (en) * 2000-08-01 2002-06-11 Delphi Technologies, Inc. Abrasion wear resistant fuel pump
US6435810B1 (en) * 2000-10-20 2002-08-20 Delphi Technologies, Inc. Wear resistant fuel pump
DE10051985A1 (en) * 2000-10-20 2002-05-02 Ina Schaeffler Kg fan clutch

Also Published As

Publication number Publication date
WO2003060328A1 (en) 2003-07-24
EP1466099A1 (en) 2004-10-13
BR0215501A (en) 2004-12-14
CN1589373A (en) 2005-03-02
US20030175110A1 (en) 2003-09-18
ES2280609T3 (en) 2007-09-16
DE50209806D1 (en) 2007-05-03
BR0215501B1 (en) 2011-03-09
DE10201405A1 (en) 2003-07-24

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