EP0536159A1 - Assembly for feeding fuel from the fuel tank of a motor vehicle to its internal combustion engine. - Google Patents

Assembly for feeding fuel from the fuel tank of a motor vehicle to its internal combustion engine.

Info

Publication number
EP0536159A1
EP0536159A1 EP91909637A EP91909637A EP0536159A1 EP 0536159 A1 EP0536159 A1 EP 0536159A1 EP 91909637 A EP91909637 A EP 91909637A EP 91909637 A EP91909637 A EP 91909637A EP 0536159 A1 EP0536159 A1 EP 0536159A1
Authority
EP
European Patent Office
Prior art keywords
channel
chamber
delivery
unit according
impeller
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
EP91909637A
Other languages
German (de)
French (fr)
Other versions
EP0536159B1 (en
Inventor
Ulrich Kemmner
Kurt Frank
Michael Niederkofler
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0536159A1 publication Critical patent/EP0536159A1/en
Application granted granted Critical
Publication of EP0536159B1 publication Critical patent/EP0536159B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F04D5/003—Regenerative pumps of multistage type
    • F04D5/005—Regenerative pumps of multistage type the stages being radially offset
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/048—Arrangements for driving regenerative pumps, i.e. side-channel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/001—Preventing vapour lock
    • F04D9/002—Preventing vapour lock by means in the very pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/02—Self-priming pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/01—Materials digest

Definitions

  • the invention relates to an aggregate according to the type of the main claim.
  • a delivery unit is already known (DE-OS 35 09 374), in which this bore is arranged directly in the delivery channel and is provided with an elastic valve flap which remains in its open position during gas delivery, but in the case of fuel change from the "tougher” medium the spring force is deformed and the channel-side mouth of the bore closes.
  • Such a structure requires a particularly complex assembly of the valve flap.
  • the open valve flap will graze the impeller of the feed pump, causing undesirable noises and ultimately being destroyed.
  • the conveyor unit according to the invention with the characterizing features of the main claim has the advantage that there are no moving components that are subject to wear during operation.
  • the assembly of such parts is also eliminated.
  • the measures listed in the subclaims allow advantageous further developments and improvements of the delivery unit specified in the main claim.
  • FIG. 1 shows a schematic illustration of an arrangement with a fuel delivery tank, a fuel delivery unit and an internal combustion engine of a motor vehicle
  • FIG. 2 shows a partial longitudinal section through the delivery unit according to FIG. 1 in an enlarged view, along the line II-II in FIG. 3
  • FIG 3 shows a section through a pump chamber cover belonging to the conveyor unit according to FIG. 2, on the suction opening side, along the line III-III.
  • FIG. 1 shows a fuel storage tank 10 in which a fuel delivery unit 12 is arranged.
  • a pressure line 16 which leads to an internal combustion engine 18, is connected to a pressure connection 14 of the fuel delivery unit 12.
  • the fuel delivery unit 12 sucks fuel from the storage tank 10 via a suction nozzle 13 and delivers it the fuel to the internal combustion engine 18.
  • the fuel delivery unit 12 is equipped with an electric drive motor 20 (FIG. 2), the motor armature 22 of which is seated on an armature shaft 24.
  • the armature shaft 24 penetrates at one end 26 a partition wall 28 which separates a space 30 in which the electric motor 20 is located from a feed pump 32.
  • the feed pump 32 is designed as a flow pump.
  • Your impeller 34 is rotatably connected to the end 26 of the armature shaft 24.
  • the impeller 34 is arranged in a pump chamber 36 which is delimited on the one hand by the partition wall 28 to the drive motor 20 and on the other hand by a cover 38 in which the suction nozzle 13 is located.
  • the feed pump is designed as a two-stage flow pump. However, this is meaningless with regard to the invention, because the invention can also be applied to a single-stage flow pump without difficulty.
  • the impeller 34 which has an inner, first ring 40 of vanes, rotates in the pump chamber 36. In its peripheral area, the impeller 34 has a second ring 42 of vanes.
  • the second ring 42 consists of two partial rings, each of which is formed on one of the two end faces 44, 46 of the substantially circular-cylindrical impeller 34.
  • the two partial wing rings of the second wing ring 42 have been given the reference numbers 51 and 53 in FIG.
  • the partition wall 28 is fixedly connected to a housing part 54 which surrounds the conveyor assembly 12.
  • the pump chamber 36 is closed by the cover 38. This is held in its receptacle by an inwardly shaped edge 56 of the housing part 54.
  • a first, inner conveying channel 50 extends counterclockwise from a suction opening 58 in the suction nozzle 13 to an intermediate channel 60 which extends essentially radially.
  • a second or outer delivery channel 52 connects to the intermediate channel 60. This extends along an edge shoulder 62 of the cover 38 to close to the intermediate channel 60
  • Corresponding conveyor channels 50, 52 are arranged in the dividing wall 28. Viewed in the radial direction, the two conveyor channels 50 and 52 are spaced apart from one another, so that a separating surface 64 remains between them the separating surfaces 64 of the dividing wall 28 and the cover 38 also lie opposite one another. 1, which has the pressure connection 14.
  • Figure 3 further shows that three bores 70 are arranged in the separating surface 64 of the cover 48, which lead from the pump chamber 36 to the suction side of the pump 32. These bores 70 therefore connect the Pump chamber with an area of the system in which there is low pressure piel the tank interior.
  • These three degassing bores 70 are arranged one behind the other in the running direction (arrow 72) of the impeller 34 in a groove-like groove 74 which extends essentially between the two delivery channels 50 and 52 in the direction of rotation arrow 72.
  • the two delivery channels 50 and 52 thus extend from the suction opening 58 to the pressure opening 68, the cover 38 having the suction opening 58 and the partition 28 having the pressure opening 68.
  • the hydraulic connection between the gegen ⁇ each other in the axial direction lying similar conveying channels is done once by the ⁇ between the wings of the first ring 40 existing openings or remaining annular gap by a between the edge of shoulder 62 and the outer circumferential surface of the impeller 34 76.
  • the course of the groove-like groove 74 can also be made clear by the fact that part of the groove 74 is in Direction of rotation (arrow 72) and another part of the groove 74 extends counter to this direction of rotation of the impeller 34.
  • the two pump chamber 36 in the axial direction of the Rades 34 bounding walls 28 and ⁇ are made of plastic in the embodiment.
  • the groove-like groove 74 is formed in the cover 38.
  • the conveyor unit according to the invention works as follows:
  • the feed pump 32 sucks fuel from the storage tank 10 via the suction opening 58 and presses it in the direction of arrow 72 through the first feed channel 50 and the intermediate channel 60 into the outer feed channel 52, from where from which fuel enters the space 30 of the drive motor 20 via the pressure opening 68 and leaves it via the pressure port 14.
  • gas bubbles mentioned occur, for example, through cavitation, which takes place in certain areas of the feed pump. Such gas bubbles can also be present in that the pump has been completely emptied and the feed pump now initially conveys this air. In all cases, it should be avoided that the gas bubbles remain in the system, reach the internal combustion engine 18 via the pressure line 16 and interfere with their operation.

Abstract

On propose un organe servant à alimenter le moteur à combustion interne (18) d'un véhicule à moteur avec du carburant provenant d'un réservoir (10). L'organe d'alimentation (12) comprend une pompe d'alimentation disposée à l'intérieur du réservoir et se présentant sous la forme d'une pompe d'écoulement, dont la roue à ailettes (34) tournante, de forme essentiellement cylindrique circulaire, est disposée dans une chambre (36) correspondante, également cylindrique circulaire, et, dans une au moins des deux parois de la chambre, un canal d'alimentation (50) approximativement circulaire, de section en forme d'encoche, s'étend d'une ouverture d'aspiration (58) aboutissant à la chambre jusqu'à une ouverture sous pression (68) partant de celle-ci et cette paroi avant de la chambre est traversée, au niveau de l'ouverture sous pression, par un orifice (70) qui relie la chambre à une zone basse pression du circuit. On obtient, d'une manière simple, une extraction particulièrement fiable des bulles de gaz à l'extérieur de la pompe et donc de la section d'alimentation, par le fait que cet orifice est situé dans une surface étanche (64) qui délimite transversalement le canal d'alimentation relativement à l'axe de rotation de la roue à ailettes.A member is provided for supplying the internal combustion engine (18) of a motor vehicle with fuel from a tank (10). The feed member (12) comprises a feed pump arranged inside the reservoir and in the form of a flow pump, the impeller (34) of which rotates, of substantially cylindrical shape. circular, is arranged in a corresponding chamber (36), also circular cylindrical, and, in at least one of the two walls of the chamber, an approximately circular supply channel (50), of notch-shaped section, s' extends from a suction opening (58) terminating in the chamber to a pressure opening (68) extending therefrom and this front wall of the chamber is traversed, at the pressure opening, by an orifice (70) which connects the chamber to a low pressure zone of the circuit. A particularly reliable extraction of gas bubbles outside the pump and therefore from the supply section is obtained in a simple manner, by the fact that this orifice is located in a sealed surface (64) which delimits transversely the feed channel relative to the axis of rotation of the paddle wheel.

Description

Aσσreσat zum Fördern von Kraftstoff vom Vorratstank zur Brennkraftmaschine eines KraftfahrzeugesAσσreσat for conveying fuel from the storage tank to the internal combustion engine of a motor vehicle
Stand der TechnikState of the art
Die Erfindung geht aus von einem Aggregat nach der Gattung des Hauptanspruchs. Es ist schon ein Förderaggregat bekannt (DE-OS 35 09 374), bei dem diese Bohrung direkt im Förderkanal angeordnet und mit einer elastischen Ventilklappe versehen ist, welche bei Gasförderung in ihrer Offenstellung verharrt, bei Kraftstoff rderung jedoch von dem "zäheren" Medium gegen die Federkraft verformt wird und die kanalseitige Mündung der Bohrung verschließt. Ein derartiger Aufbau erfordert jedoch eine besonders aufwendige Montage der Ventilklappe. Auch besteht die Gefahr, daß bei Gasförderung die offene Ventilklappe am Flügelrad der Förderpumpe streift, dabei unerwünschte Geräusche verursacht und schließlich zerstört wird.The invention relates to an aggregate according to the type of the main claim. A delivery unit is already known (DE-OS 35 09 374), in which this bore is arranged directly in the delivery channel and is provided with an elastic valve flap which remains in its open position during gas delivery, but in the case of fuel change from the "tougher" medium the spring force is deformed and the channel-side mouth of the bore closes. Such a structure, however, requires a particularly complex assembly of the valve flap. There is also the risk that when gas is being pumped, the open valve flap will graze the impeller of the feed pump, causing undesirable noises and ultimately being destroyed.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Förderaggregat mit den kennzeichnenden Merk¬ malen des Hauptanspruchs hat demgegenüber den Vorteil, daß keine beweglichen, während des Betriebs einen Verschleiß unterworfenen Bauelemente vorhanden sind. Auch die Montage solcher Teile entfällt. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vor¬ teilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Förderaggregats möglich. Besonders vorteilhaft ist es, bei einem Förderaggregat dessen Flügelrand einen ersten und einen zweiten Kranz von Flügeln hat, von denen der zweite Flügelkranz einen größeren Radius als der erste Flügelkranz aufweist und sich in der Kammer-Stirnwand zwei, dem jeweiligen Flügelkranz zugeordnete Förderkanäle befinden, von denen der innere Förderkanal über einen Zwischenkanal mit dem äußeren Förderkanal verbunden ist, sowie die Saugöffnung am inneren und die Drucköffnung am äußeren Förderkanal angeordnet sind, sich die Bohrung in einem Bereich der Dichtfläche befindet, welcher sich zumindest im wesentlichen zwischen den beiden Förderkanälen erstreckt.The conveyor unit according to the invention with the characterizing features of the main claim has the advantage that there are no moving components that are subject to wear during operation. The assembly of such parts is also eliminated. The measures listed in the subclaims allow advantageous further developments and improvements of the delivery unit specified in the main claim. It is particularly advantageous in the case of a conveyor unit whose wing edge has a first and a second ring of wings, of which the second wing ring has a larger radius than the first wing ring and there are two conveying channels associated with the respective wing ring in the front wall of the chamber which the inner delivery channel is connected to the outer delivery channel via an intermediate channel, and the suction opening on the inner and the pressure opening on the outer delivery channel are arranged, the bore is located in a region of the sealing surface which extends at least substantially between the two delivery channels.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung darge¬ stellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine schematische Darstellung einer Anordnung mit einem Kraftstoffördertank, einem Kraftstofförderaggregat und einer Brennkraftmaschine eines Kraftfahrzeuges, Figur 2 einen Teil-Längs¬ schnitt durch das Förderaggregat gemäß Figur 1 in vergrößerter Darstellung, entlang der Linie II-II in Figur 3 und Figur 3 einen Schnitt durch einen zum Förderaggregat gemäß Figur 2 gehörenden, saugöffnungsseitigen Pu penkammerdeckel, entlang der Linie III-III.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a schematic illustration of an arrangement with a fuel delivery tank, a fuel delivery unit and an internal combustion engine of a motor vehicle, FIG. 2 shows a partial longitudinal section through the delivery unit according to FIG. 1 in an enlarged view, along the line II-II in FIG. 3 and FIG 3 shows a section through a pump chamber cover belonging to the conveyor unit according to FIG. 2, on the suction opening side, along the line III-III.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Figur 1 zeigt einen KraftstoffVorratstank 10, in dem ein Kraft¬ stofförderaggregat 12 angeordnet ist. An einem Druckstutzen 14 des Kraftstofförderaggregats 12 ist eine Druckleitung 16 angeschlossen, die zu einer Brennkraftmaschine 18 führt. Während des Betriebs der Brennkraftmaschine 18 saugt das Kraftstofförderaggregat 12 über einen Saugstutzen 13 Kraftstoff aus dem Vorratstank 10 und fördert den Kraftstoff zur Brennkraftmaschine 18. Das Kraftstofförder¬ aggregat 12 ist mit einem elektrischen Antriebsmotor 20 ausgestattet (Figur 2), dessen Motoranker 22 auf einer Ankerwelle 24 sitzt. Die Ankerwelle 24 durchdringt mit ihrem einen Ende 26 eine Trennwand 28, welche einen Raum 30, in welchem sich der Elektromotor 20 befindet, von einer Förderpumpe 32 trennt. Die Förderpumpe 32 ist als Strömungspumpe ausgebildet. Ihr Flügelrad 34 ist drehfest mit dem Ende 26 der Ankerwelle 24 verbunden. Das Flügelrad 34 ist in einer Pumpenkammer 36 angeordnet, welche einerseits durch die Trennwand 28 zum Antriebsmotor 20 hin und andererseits durch einen Deckel 38 begrenzt ist, in welchem sich der Saugstutzen 13 befindet. Beim Ausführungsbeispiel ist die Förderpumpe als zweistufige Strömungs¬ pumpe ausgebildet. Dies ist jedoch im Hinblick auf die Erfindung bedeutungslos, weil die Erfindung auch ohne Schwierigkeiten bei einer einstufigen Strömungspumpe angewendet werden kann. In der Pumpenkammer 36 läuft das Flügelrad 34 um, welches einen inneren, ersten Kranz 40 von Flügeln aufweist. In seinem peripheralen Bereich hat das Flügelrad 34 einen zweiten Kranz 42 von Flügeln. Dabei besteht der zweite Kranz 42 aus zwei Teilkränzen, von denen jeder an einer der beiden Stirnflächen 44, 46 des im wesentlichen kreis- zylinderförmigen Flügelrads 34 ausgebildet ist. Die beiden Teil¬ flügelkränze des zweiten Flügelkranzes 42 sind in Figur 2 mit den Bezugszahlen 51 und 53 versehen worden. Die Trennwand 28 ist fest mit einem Gehäuseteil 54 verbunden, welches das Förderaggregat 12 umschließt. Auf der von der Trennwand 28 abgewandten Seite des Flügelrades 34 ist die Pumpenkammer 36 durch den Deckel 38 ver¬ schlossen. Dieser wird in seiner Aufnahme durch einen nach innen geformten Rand 56 des Gehäuseteils 54 gehalten. Wie Figur 3 zeigt, erstreckt sich ein erster, innerer Förderkanal 50 von einer im Saug¬ stutzen 13 befindlichen Saugöffnung 58 aus im Gegenuhrzeigersinn bis zu einem Zwischenkanal 60, der sich im wesentlichen radial er¬ streckt. An den Zwischenkanal 60 schließt sich ein zweiter oder äußerer Förderkanal 52 an. Dieser erstreckt sich entlang einer Rand- schulter 62 des Deckels 38 bis nahe dem Zwischenkanal 60. Auch in der Trennwand 28 sind entsprechende "rörderkanäle 50, 52 angeordnet. In radialer Richtung gesehen liegen die beiden Förderkanäle 50 und 52 mit Abstand voneinander, so daß zwischen diesen eine Trennfläche 64 verbleibt. Da in Achsrichtung gesehen die beiden Förderkanäle 50 und die beiden Förderkanäle 52 einander gegenüberliegen, liegen sich auch die Trennflächen 64 der Trennwand 28 und des Deckels 38 einander gegenüber. Im Bereich des Auslaufs 66 des Förderkanals 52 im Deckel 38 liegt diesem in der Trennwand 28 eine Drucköffnung 68 gegenüber, welche den Förderkanal 52 mit dem Raum 30 verbindet, der, wie Figur 1 zeigt, den Druckstutzen 14 aufweist. Weiter zeigt Figur 3, daß in der Trennfläche 64 des Deckels 48 drei Bohrungen 70 angeordnet sind, welche von der Pumpenkammer 36 aus zur Saugseite der Pumpe 32 führen. Diese Bohrungen 70 verbinden also die Pumpen¬ kammer mit einem Bereich des Systems, in welchem Niederdruck herrscht. Dieser Bereich ist beim Ausführungsbeispiel der Tankinnen¬ raum. Diese drei Entgasungsbohrungen 70 sind in Laufrichtung (Pfeil 72) des Laufrades 34 gesehen hintereinander in einer rinnenartigen Nut 74 angeordnet, die sich im wesentlichen zwischen den beiden Förderkanälen 50 und 52 in Drehrichtung Pfeil 72 erstreckt. Die beiden Förderkanäle 50 und 52 erstrecken sich also ausgehend von der Saugöffnung 58 zur Drucköffnung 68, wobei der Deckel 38 die Saug¬ öffnung 58 und die Trennwand 28 die Drucköffnung 68 aufweisen. Die hydraulische Verbindung zwischen den einander in Achsrichtung gegen¬ überliegenden gleichartigen Förderkanälen geschieht einmal durch die ■ zwischen den Flügeln des ersten Kranzes 40 vorhandenen Durchbrüche bzw. durch einen zwischen der Randschulter 62 und der äußeren Mantelfläche des Flügelrades 34 verbleibenden Ringspalt 76. Wenn man davon ausgeht, daß die Erfindung auch mit nur einer einzigen Bohrung 70 relaisierbar ist und diese einzige Bohrung durch die mittlere Bohrung in Figur 3 dargestellt ist, kann der Verlauf der rinnen¬ artigen Nut 74 auch dadurch deutlich gemacht werden, daß sich ein Teil der Nut 74 in Umlaufrichtung (Pfeil 72) und ein anderer Teil der Nut 74 sich entgegen dieser Umlaufrichtung des Flügelrades 34 erstreckt. Die beiden die Pumpenkammer 36 in Achsrichtung des Lauf- rades 34 begrenzenden Wände 28 und ϊβ sind beim Ausführungsbeispiel aus Kunststoff hergestellt. Dabei ist die rinnenartige Nut 74 in den Deckel 38 eingeformt.FIG. 1 shows a fuel storage tank 10 in which a fuel delivery unit 12 is arranged. A pressure line 16, which leads to an internal combustion engine 18, is connected to a pressure connection 14 of the fuel delivery unit 12. During the operation of the internal combustion engine 18, the fuel delivery unit 12 sucks fuel from the storage tank 10 via a suction nozzle 13 and delivers it the fuel to the internal combustion engine 18. The fuel delivery unit 12 is equipped with an electric drive motor 20 (FIG. 2), the motor armature 22 of which is seated on an armature shaft 24. The armature shaft 24 penetrates at one end 26 a partition wall 28 which separates a space 30 in which the electric motor 20 is located from a feed pump 32. The feed pump 32 is designed as a flow pump. Your impeller 34 is rotatably connected to the end 26 of the armature shaft 24. The impeller 34 is arranged in a pump chamber 36 which is delimited on the one hand by the partition wall 28 to the drive motor 20 and on the other hand by a cover 38 in which the suction nozzle 13 is located. In the exemplary embodiment, the feed pump is designed as a two-stage flow pump. However, this is meaningless with regard to the invention, because the invention can also be applied to a single-stage flow pump without difficulty. The impeller 34, which has an inner, first ring 40 of vanes, rotates in the pump chamber 36. In its peripheral area, the impeller 34 has a second ring 42 of vanes. The second ring 42 consists of two partial rings, each of which is formed on one of the two end faces 44, 46 of the substantially circular-cylindrical impeller 34. The two partial wing rings of the second wing ring 42 have been given the reference numbers 51 and 53 in FIG. The partition wall 28 is fixedly connected to a housing part 54 which surrounds the conveyor assembly 12. On the side of the impeller 34 facing away from the partition 28, the pump chamber 36 is closed by the cover 38. This is held in its receptacle by an inwardly shaped edge 56 of the housing part 54. As FIG. 3 shows, a first, inner conveying channel 50 extends counterclockwise from a suction opening 58 in the suction nozzle 13 to an intermediate channel 60 which extends essentially radially. A second or outer delivery channel 52 connects to the intermediate channel 60. This extends along an edge shoulder 62 of the cover 38 to close to the intermediate channel 60 Corresponding conveyor channels 50, 52 are arranged in the dividing wall 28. Viewed in the radial direction, the two conveyor channels 50 and 52 are spaced apart from one another, so that a separating surface 64 remains between them the separating surfaces 64 of the dividing wall 28 and the cover 38 also lie opposite one another. 1, which has the pressure connection 14. Figure 3 further shows that three bores 70 are arranged in the separating surface 64 of the cover 48, which lead from the pump chamber 36 to the suction side of the pump 32. These bores 70 therefore connect the Pump chamber with an area of the system in which there is low pressure piel the tank interior. These three degassing bores 70 are arranged one behind the other in the running direction (arrow 72) of the impeller 34 in a groove-like groove 74 which extends essentially between the two delivery channels 50 and 52 in the direction of rotation arrow 72. The two delivery channels 50 and 52 thus extend from the suction opening 58 to the pressure opening 68, the cover 38 having the suction opening 58 and the partition 28 having the pressure opening 68. The hydraulic connection between the gegen¬ each other in the axial direction lying similar conveying channels is done once by the ■ between the wings of the first ring 40 existing openings or remaining annular gap by a between the edge of shoulder 62 and the outer circumferential surface of the impeller 34 76. Assuming that the invention can also be relayed with only a single bore 70 and this single bore is represented by the central bore in FIG. 3, the course of the groove-like groove 74 can also be made clear by the fact that part of the groove 74 is in Direction of rotation (arrow 72) and another part of the groove 74 extends counter to this direction of rotation of the impeller 34. The two pump chamber 36 in the axial direction of the Rades 34 bounding walls 28 and ϊβ are made of plastic in the embodiment. The groove-like groove 74 is formed in the cover 38.
Im Betrieb arbeitet das erfindungsgemäße Förderaggregat wie folgt:In operation, the conveyor unit according to the invention works as follows:
Wenn das Flügelrad 34 durch den Elektromotor 20 angetrieben wird, saugt die Förderpumpe 32 übr die Saugöffnung 58 Kraftstoff aus dem Vorratstank 10 an und drückt diesen in Richtung des Pfeiles 72 durch den ersten Förderkanal 50 und den Zwischenkanal 60 in den äußeren Förderkanal 52, von wo aus der Kraftstoff über die Drucköffnung 68 in den Raum 30 des Antriebsmotors 20 eintritt und diesen über den Druckstutzen 14 verläßt. Zwischen den beiden Stirnflächen des Flügelrades 34 und den diesen zugewandten Wänden 38, 28 sind gering¬ fügige Radialspalte vorhanden, über die im Förderkanal 50, 60, 52 vorhandene Gasblasen in Richtung der Pfeile 78 aus den Förderkanälen gedrückt und von der rinnenartigen Nut 74 aufgenommen werden. Von dort aus verlassen die Gasblasen die Pumpenkammer 36 über die Boh¬ rungen 70. Die angesprochenen Gasblasen treten beispielsweise durch Kavitation auf, welche in bestimmten Bereichen der Förderpumpe stattfindet. Auch können solche Gasblasen dadurch vorhanden sein, daß die Pumpe völlig entleert gewesen ist und die Förderpumpe zunächst nun diese Luft fördert. In allen Fällen soll vermieden werden, daß die Gasblasen in dem System verbleiben, über die Druck¬ leitung 16 zur Brennkraftmaschine 18 gelangen und deren Betrieb stören. When the impeller 34 is driven by the electric motor 20, the feed pump 32 sucks fuel from the storage tank 10 via the suction opening 58 and presses it in the direction of arrow 72 through the first feed channel 50 and the intermediate channel 60 into the outer feed channel 52, from where from which fuel enters the space 30 of the drive motor 20 via the pressure opening 68 and leaves it via the pressure port 14. There are slight radial gaps between the two end faces of the impeller 34 and the walls 38, 28 facing them, via which gas bubbles present in the delivery channel 50, 60, 52 are pressed out of the delivery channels in the direction of arrows 78 and are received by the channel-like groove 74 . From there, the gas bubbles leave the pump chamber 36 via the bores 70. The gas bubbles mentioned occur, for example, through cavitation, which takes place in certain areas of the feed pump. Such gas bubbles can also be present in that the pump has been completely emptied and the feed pump now initially conveys this air. In all cases, it should be avoided that the gas bubbles remain in the system, reach the internal combustion engine 18 via the pressure line 16 and interfere with their operation.

Claims

D -Ansprüche D claims
1. Aggregat zum Fördern von Kraftstoff vom Vorratstank zur Brenn¬ kraftmaschine eines Kraftfahrzeuges, mit einer im Vorratstank ange¬ ordneten, als Strömungspumpe ausgebildeten Förderpumpe, deren im wesentlichen kreiszylinderförmiges, umlaufend angetriebenes Flügel¬ rad in einer entsprechend kreiszylindrischen Pumpenkammer angeordnet ist und zumindest in einer der beiden Kammer-Stirnwänden wenigstens ein annähernd ringförmiger, im Querschnitt nutartiger Förderkanal sich von einer in die Pumpenkammer mündenden Saugöffnung zu einer aus dieser herausführenden Drucköffnung erstreckt und diese Kammer-Stirnwand im Bereich der Drucköffnung von einer Bohrung durchdrungen ist, welche die Pumpenkammer mit einem Bereich des Systems verbindet, in welchem Niederdruck herrscht, dadurch gekenn¬ zeichnet, daß die Bohrung (70) sich in einer Dichtfläche (64) befindet, welche den Förderkanal (50, 60, 52), bezogen auf die Dreh¬ achse des Flügelrades (34), in radialer Richtung begrenzt.1. Unit for conveying fuel from the storage tank to the internal combustion engine of a motor vehicle, with a delivery pump arranged in the storage tank and designed as a flow pump, the substantially circular-cylindrical, rotatingly driven impeller of which is arranged in a correspondingly circular-cylindrical pump chamber and at least in one of the two chamber end walls, at least one approximately annular, cross-sectionally groove-like delivery channel extends from a suction opening opening into the pump chamber to a pressure opening leading out of this, and this chamber end wall is penetrated in the region of the pressure opening by a bore which the pump chamber has an area of the system in which low pressure prevails, characterized in that the bore (70) is located in a sealing surface (64) which defines the delivery channel (50, 60, 52) with respect to the axis of rotation of the impeller (34 ), limit in the radial direction currently
2. Aggregat nach Anspruch 1, dadurch gekennzeichnet, daß in der Dichtfläche (64) ein rinnenartiger Kanal (74) angeordnet ist, der sich von der Bohrung (70) ausgehend, teilweise in Umlaufrichtung (Pfeil 72) und teilweise entgegen der Umlaufrichtung des Flügelrades (34) erstreckt. 2. Unit according to claim 1, characterized in that a channel-like channel (74) is arranged in the sealing surface (64), starting from the bore (70), partly in the circumferential direction (arrow 72) and partly counter to the circumferential direction of the impeller (34) extends.
3. Aggregat nach Anspruch 2, dadurcn gekennzeichnet, daß in dem rinnenartigen Kanal (74) weitere Bohrungen (70) angeordnet sind.3. Unit according to claim 2, characterized in that further bores (70) are arranged in the channel-like channel (74).
4. Aggregat nach einem der Ansprüche 1 bis 3, bei dem das Flügelrad einen ersten und einen zweiten Kranz von Flügeln hat, von denen der zweite Kranz einen größeren Radius als der Flügelkranz aufweist und sich in der Kammer-Stirnwand zwei dem jeweiligen Flügelkranz zuge¬ ordnete Förderkanäle befinden, von denen der innere Förderkanal über einen Zwischenkanal mit dem äußeren Förderkanal verbunden ist sowie die S ugöffnung am inneren und die Drucköffnung am äußeren Förder¬ kanal angeordnet sind, dadurch gekennzeichnet, daß sich die Bohrung (70) in einem Bereich der Dichtfläche (64) befindet, welcher'sich zumindest im wesentlichen zwischen den beiden Förderkanälen (50, 52) erstreckt.4. Unit according to one of claims 1 to 3, wherein the impeller has a first and a second ring of wings, of which the second ring has a larger radius than the wing ring and two zuge¬ in the chamber front wall zuge¬ orderly delivery channels are located, of which the inner delivery channel is connected to the outer delivery channel via an intermediate channel and the suction opening is arranged on the inner and the pressure opening on the outer delivery channel, characterized in that the bore (70) is located in a region of the sealing surface (64), which extends at least substantially between the two delivery channels (50, 52).
5. Aggregat nach Anspruch 4, dadurch gekennzeichnet, daß sich der rinnenartige Kanal (74) in radialer Richtung zwischen den beiden Förderkanälen (50, 52) bis in den Bereich des Zwischenkanals (60) erstreckt.5. Unit according to claim 4, characterized in that the channel-like channel (74) extends in the radial direction between the two delivery channels (50, 52) into the region of the intermediate channel (60).
6. Aggregat nach einem der Ansprüche 1 bis 5, dadurch gekennzeich¬ net, daß die Kammerwand (48) aus Kunststoff hergestellt und vorzugs¬ weise gespritzt ist.6. Unit according to one of claims 1 to 5, characterized gekennzeich¬ net that the chamber wall (48) made of plastic and is preferably sprayed.
7. Aggregat nach Anspruch 6, dadurch gekennzeichnet, daß der rinnen¬ artige Kanal (74) in die Stirnwand des Deckels (48) eingeformt ist.7. Unit according to claim 6, characterized in that the channel-like channel (74) is molded into the end wall of the cover (48).
8. Aggregat nach einem der Ansprüche 1 bis 7, dadurch gekennzeich¬ net, daß die Bohrung (70) einen Bereich höheren Druckes in der Pumpenkammer (36) mit dem von dem Vorratstank (10) umschlossenen Raum verbindet. 8. Unit according to one of claims 1 to 7, characterized gekennzeich¬ net that the bore (70) connects a region of higher pressure in the pump chamber (36) with the space enclosed by the storage tank (10).
EP91909637A 1990-06-28 1991-05-27 Assembly for feeding fuel from the fuel tank of a motor vehicle to its internal combustion engine Expired - Lifetime EP0536159B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4020520 1990-06-28
DE4020520A DE4020520A1 (en) 1990-06-28 1990-06-28 AGGREGATE FOR PROCESSING FUEL FROM THE STORAGE TANK TO THE INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE
PCT/DE1991/000449 WO1992000449A1 (en) 1990-06-28 1991-05-27 Assembly for feeding fuel from the fuel tank of a motor vehicle to its internal combustion engine

Publications (2)

Publication Number Publication Date
EP0536159A1 true EP0536159A1 (en) 1993-04-14
EP0536159B1 EP0536159B1 (en) 1994-08-31

Family

ID=6409210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91909637A Expired - Lifetime EP0536159B1 (en) 1990-06-28 1991-05-27 Assembly for feeding fuel from the fuel tank of a motor vehicle to its internal combustion engine

Country Status (5)

Country Link
US (1) US5338151A (en)
EP (1) EP0536159B1 (en)
JP (1) JP3027186B2 (en)
DE (2) DE4020520A1 (en)
WO (1) WO1992000449A1 (en)

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Also Published As

Publication number Publication date
DE59102760D1 (en) 1994-10-06
JP3027186B2 (en) 2000-03-27
DE4020520A1 (en) 1992-01-02
US5338151A (en) 1994-08-16
WO1992000449A1 (en) 1992-01-09
JPH05508459A (en) 1993-11-25
EP0536159B1 (en) 1994-08-31

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