EP2257706A1 - Device for feeding fuel - Google Patents

Device for feeding fuel

Info

Publication number
EP2257706A1
EP2257706A1 EP08872994A EP08872994A EP2257706A1 EP 2257706 A1 EP2257706 A1 EP 2257706A1 EP 08872994 A EP08872994 A EP 08872994A EP 08872994 A EP08872994 A EP 08872994A EP 2257706 A1 EP2257706 A1 EP 2257706A1
Authority
EP
European Patent Office
Prior art keywords
pot
jet pump
suction
suction jet
fuel
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
EP08872994A
Other languages
German (de)
French (fr)
Other versions
EP2257706B1 (en
Inventor
Radek Malec
Petr Janis
Zdenek Belda
Juergen Gras
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 EP2257706A1 publication Critical patent/EP2257706A1/en
Application granted granted Critical
Publication of EP2257706B1 publication Critical patent/EP2257706B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025—Feeding by means of a liquid fuel-driven jet pump
    • 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
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
    • 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators

Definitions

  • the invention relates to a device for conveying fuel according to the preamble of the main claim.
  • the device according to the invention with the characterizing features of the main claim has the advantage that the flow turbulence is reduced and the suction of the suction jet pump is increased by the decrease in gas bubble formation by provided at the bottom of the reservoir cup in the suction chamber at the transition into the mixing duct, a sloping ramp for low-turbulence flow guidance is.
  • the intake opening and the entrance into the mixing channel are arranged in different planes, which are realized by means of the invention
  • Inclined ramp are interconnected. Due to the lower flow turbulences in the suction jet pump arise when heated fuel fewer bubbles in the fuel, so that more fuel is conveyed into the storage tank.
  • the oblique ramp goes continuously into the bottom of the pot. In this way, flow turbulences are avoided, so that with the same propulsion jet quantity a larger intake capacity is achieved.
  • Suction jet pump are executed, wherein the suction chamber is open to the bottom of the pot.
  • a closed chamber is achieved in this way, which is flow-connected via the suction port to a fuel tank and via the mixing channel with the storage pot.
  • the housing of the suction jet pump has a step-shaped transition from the suction chamber into the mixing channel, to which the inclined ramp adjoins.
  • the inclined ramp is carried out separately on the bottom of the pot and separately from the housing of the suction jet pump, wherein after the attachment of the housing of the suction jet pump to the bottom of the pot, an inventive suction jet pump is formed with a substantially continuous transition from the suction chamber into the mixing channel.
  • the inclined ramp is made in one piece on the bottom of the pot pot, since the inclined ramp can be produced in this way particularly cost by injection molding together with the storage pot.
  • the pot bottom of the storage cup therefore has a bevel formed on it.
  • the housing of the suction jet pump can be fixed by means of holding means on the bottom of the pot.
  • a receptacle for fixing the suction jet pump is provided on the bottom of the pot, since the housing of the suction jet pump in this way is particularly easy to attach to the bottom of the pot pot.
  • Suction jet pump and Figure 2 shows a detail of the pot bottom of the storage cup of Figure 1.
  • Fig.l shows in section a device for conveying fuel with a suction jet pump according to the invention.
  • the device for conveying fuel is arranged in a fuel tank 1 and conveyed by means of a delivery unit 2 fuel from the fuel tank 1 druckerhöht via a pressure line 3 to an internal combustion engine 4.
  • the delivery unit 2 is arranged in a storage pot 5, which is sufficient for the delivery unit 2 fuel holds, so that it can suck in fuel even at low levels in the fuel tank 1 and when accelerating, braking, cornering and / or climbing.
  • the storage pot 5 has a pot bottom 6.
  • Pressure line 3 branches off a tether 8, which drives a suction jet pump 9 for actively filling the storage cup 5.
  • a pressure regulating valve 10 may be provided, which can only flow off fuel from the pressure line 3 into the tapping line 8 from a predetermined pressure in the pressure line 3.
  • a check valve 11 is provided in the pressure line 3, which prevents a backflow of fuel.
  • a mixing channel 16 connects, which is arranged in an imaginary extension of the beam output 14, such that a line from the beam output 14 of the drive 8 exiting fluid jet via the suction chamber 15 rectilinearly passes into the mixing channel 16.
  • the mixing channel 16 extends horizontally in the direction of the bottom of the pot. 6
  • the mode of action of the suction jet pump 9 is sufficiently well known, so that it will be described only briefly here: via the tether 8 and its jet outlet 14, a blowing current is introduced into the suction chamber 15 in the form of a jet.
  • the propulsion jet of the haulage line 8 entrains surrounding fuel from the suction chamber 15 into the mixing channel 16, so that a delivery flow is established via the mixing channel 16 into the storage pot 5.
  • the suction chamber 15 creates a negative pressure, the fuel via a suction port 17 of the suction chamber 15 from the - A -
  • Fuel tank 1 can flow into the suction chamber 15.
  • a valve member 18 is provided which cooperates with the Ansaugöffhung 17 and forms with this a check valve.
  • the suction chamber 15 and the mixing channel 16 are formed on a housing 19 of the suction jet pump 9, wherein the suction chamber 15 is open to the bottom of the pot 6.
  • the part of the housing 19 with the suction chamber 15 is arranged on the bottom of the pot 6 and includes the Ansaugöffhung 17 a. Thereby, a closed suction chamber 15 is reached, which is flow-connected via the suction port 17 to the fuel tank 1 and via the mixing channel 16 with the storage cup 5.
  • a portion of the treble line 8 is formed, which opens into the suction chamber 15 with the narrowed jet outlet 14.
  • an oblique ramp 20 for low-turbulence flow guidance is provided on the bottom of the pot 6 of the reservoir cup 5 within the suction chamber 15 at the transition into the mixing channel 16.
  • the oblique ramp 20 reduces the turbulence in the flow, so that less gas bubbles arise within the suction jet pump 9, in particular in so-called hot gasoline.
  • the oblique ramp 20 acts as a so-called deflector and deflects the flow with low turbulence.
  • the Ansaugöffhung 17 and the bottom of the pot 6 facing lower edge 24 at the suction chamber side entrance 16.1 in the mixing channel 16 are arranged in different planes, wherein the planes are connected to each other by means of the oblique ramp 20.
  • the ramp ramp 20 rises substantially continuously from the plane with the Ansaugöffhung 17 to the plane with the lower edge 24 at.
  • the oblique ramp 20 could also be designed to increase in stages in several stages.
  • the oblique ramp 20 is essentially continuous in the bottom of the pot 6.
  • the housing 19 of the suction jet pump 9 itself has a step-shaped transition 23 from the suction chamber 15 in the mixing channel 16, wherein the oblique ramp 20 of the pot bottom 6 and the lower edge 24 at the input 16.1 of the mixing channel 16 after attachment of the housing 19 to the pot bottom. 6 essentially steplessly connect to each other. Seen in the flow direction thus includes at the highest point of the oblique ramp 20 of the mixing channel 16 with the lower edge 24, wherein at the transition between the oblique ramp 20 and the mixing channel 16, a connection gap 21 is formed.
  • the wall thickness of the pot bottom 6 in the region of the oblique ramp 20 is approximately the same as in the rest of the pot bottom. 6
  • the oblique ramp 20 is integrally formed on the bottom of the pot 6
  • the oblique ramp 20 could also be a separate part, the am Pot bottom 6 or attached to the housing 19 of the suction jet pump 9. Likewise, it may be provided to form the oblique ramp 20 in one piece on the housing 19 of the suction jet pump 9.
  • the housing 19 is fixed by means of holding means 28 on the bottom of the pot 6.
  • a receptacle 27 for the part of the housing 19 with the suction chamber 15 is provided on the bottom of the pot 6 of the storage pot 5.
  • the receptacle 27 is adapted to the shape of the suction chamber 15, so that the housing 19 can be inserted with the suction chamber 15 in the receptacle 27.
  • the suction jet pump 9 is fixed in the receptacle 27 by means of the holding means 28, for example, locked.
  • the receptacle 27 surrounds the suction opening 17th
  • a coarse filter 30 is formed, which filters the sucked by the suction jet 9 fuel upstream of the suction port 17.
  • FIG. 2 shows a section of the pot bottom of the storage cup of Fig.l.

Abstract

Devices for feeding fuel are already known which have a storage pot which can be filled by means of a suction jet pump and which has a pot base with an intake opening which opens into an intake chamber of the suction jet pump and through which the suction jet pump sucks in fuel, wherein the intake chamber is fluidically connected to the storage pot via a mixer duct. A non-return valve is provided in the intake opening in order to prevent fuel from flowing back. Considerable flow turbulence occurs within the suction jet pump, which flow turbulence can lead, in particular in the case of heated fuel, referred to as hot petrol, to the formation of gas bubbles. The delivery capacity of the suction jet pump is considerably reduced by the gas bubbles, with the result that under certain operating conditions the storage pot is not sufficiently filled and can run empty. In the device according to the invention, the flow turbulence is reduced. The invention provides that an oblique ramp (20) for guiding the flow with little turbulence is provided at the junction (23) with the mixer duct (16) on the pot base (6) of the storage pot (5) inside the intake chamber (15).

Description

Beschreibung description
Titeltitle
Vorrichtung zum Fördern von KraftstoffDevice for conveying fuel
Stand der TechnikState of the art
Die Erfindung geht aus von einer Vorrichtung zum Fördern von Kraftstoff nach der Gattung des Hauptanspruchs.The invention relates to a device for conveying fuel according to the preamble of the main claim.
Es ist schon eine Vorrichtung zum Fördern von Kraftstoff aus der US 5,330,475 Al und der US 4,860,714 Al bekannt, mit einem mittels einer Saugstrahlpumpe befüllbaren Speichertopf, der einen Topfboden mit einer Ansaugöffnung aufweist, die in eine Ansaugkammer der Saugstrahlpumpe mündet und durch die die Saugstrahlpumpe Kraftstoff ansaugt, wobei die Ansaugkammer über einen Mischkanal mit dem Speichertopf strömungsverbunden ist. In der Ansaugöffnung ist ein Rückschlagventil vorgesehen, um ein Rückfließen von Kraftstoff zu verhindern. Innerhalb der Saugstrahlpumpe treten erhebliche Strömungsturbulenzen auf, die insbesondere bei aufgeheiztem Kraftstoff, sogenanntem Heißbenzin, zur Bildung von Gasblasen führen. Durch die Gasblasen wird die Förderleistung der Saugstrahlpumpe erheblich vermindert, so dass der Speichertopf bei bestimmten Betriebszuständen nicht ausreichend befüllt wird und leerlaufen kann.It is already a device for conveying fuel from US 5,330,475 Al and US 4,860,714 Al known with a fillable by means of a suction jet pump storage pot having a pot bottom with an intake opening into a suction chamber of the suction jet pump and through which the ejector fuel sucks, wherein the suction chamber is flow-connected via a mixing channel with the storage pot. In the suction port, a check valve is provided to prevent backflow of fuel. Within the suction jet pump, considerable flow turbulences occur, which lead to the formation of gas bubbles, in particular in the case of heated fuel, so-called hot gasoline. Due to the gas bubbles, the delivery rate of the suction jet pump is significantly reduced, so that the storage tank is not sufficiently filled in certain operating conditions and can run idle.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass die Strömungsturbulenzen verringert und die Ansaugleistung der Saugstrahlpumpe durch die Abnahme der Gasblasenbildung erhöht wird, indem am Topfboden des Speichertopfes innerhalb der Ansaugkammer am Übergang in den Mischkanal eine Schrägrampe zur turbulenzarmen Strömungsführung vorgesehen ist. Die Ansaugöffnung und der Eingang in den Mischkanal sind in unterschiedlichen Ebenen angeordnet, die mittels der erfindungsgemäßenThe device according to the invention with the characterizing features of the main claim has the advantage that the flow turbulence is reduced and the suction of the suction jet pump is increased by the decrease in gas bubble formation by provided at the bottom of the reservoir cup in the suction chamber at the transition into the mixing duct, a sloping ramp for low-turbulence flow guidance is. The intake opening and the entrance into the mixing channel are arranged in different planes, which are realized by means of the invention
Schrägrampe miteinander verbunden werden. Durch die geringeren Strömungsturbulenzen in der Saugstrahlpumpe entstehen bei aufgeheiztem Kraftstoff weniger Blasen im Kraftstoff, so dass mehr Kraftstoff in den Speichertopf gefördert wird.Inclined ramp are interconnected. Due to the lower flow turbulences in the suction jet pump arise when heated fuel fewer bubbles in the fuel, so that more fuel is conveyed into the storage tank.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Vorrichtung möglich. Gemäß einer vorteilhaften Ausführung geht die Schrägrampe kontinuierlich in den Topfboden über. Auf diese Weise werden Strömungsturbulenzen vermieden, so dass mit der gleichen Treibstrahlmenge eine größere Ansaugleistung erreicht wird.The measures listed in the dependent claims advantageous refinements and improvements of the main claim device are possible. According to an advantageous embodiment, the oblique ramp goes continuously into the bottom of the pot. In this way, flow turbulences are avoided, so that with the same propulsion jet quantity a larger intake capacity is achieved.
Sehr vorteilhaft ist es, wenn die Ansaugkammer und der Mischkanal an einem Gehäuse derIt is very advantageous if the suction chamber and the mixing channel on a housing of the
Saugstrahlpumpe ausgeführt sind, wobei die Ansaugkammer zum Topfboden hin offen ist. Beim Anordnen der Ansaugkammer am Topfboden wird auf diese Weise eine geschlossene Kammer erreicht, die über die Ansaugöffnung mit einem Kraftstofftank und über den Mischkanal mit dem Speichertopf strömungsverbunden ist.Suction jet pump are executed, wherein the suction chamber is open to the bottom of the pot. When arranging the suction chamber on the bottom of the pot a closed chamber is achieved in this way, which is flow-connected via the suction port to a fuel tank and via the mixing channel with the storage pot.
Auch vorteilhaft ist, dass das Gehäuse der Saugstrahlpumpe einen stufenförmigen Übergang von der Ansaugkammer in den Mischkanal aufweist, an dem die Schrägrampe anschließt. Die Schrägrampe ist separat am Topfboden und getrennt von dem Gehäuse der Saugstrahlpumpe ausgeführt, wobei nach der Befestigung des Gehäuses der Saugstrahlpumpe an dem Topfboden eine erfindungsgemäße Saugstrahlpumpe mit im wesentlichen stetigem Übergang von der Ansaugkammer in den Mischkanal gebildet ist.It is also advantageous that the housing of the suction jet pump has a step-shaped transition from the suction chamber into the mixing channel, to which the inclined ramp adjoins. The inclined ramp is carried out separately on the bottom of the pot and separately from the housing of the suction jet pump, wherein after the attachment of the housing of the suction jet pump to the bottom of the pot, an inventive suction jet pump is formed with a substantially continuous transition from the suction chamber into the mixing channel.
Besonders vorteilhaft ist, wenn die Schrägrampe einstückig am Topfboden des Speichertopfes ausgeführt ist, da sich die Schrägrampe auf diese Weise besonders kostengünstig durch Spritzgießen zusammen mit dem Speichertopf herstellen lässt. Der Topf boden des Speichertopfes weist daher eine an ihm ausgebildete Schrägrampe auf.It is particularly advantageous if the inclined ramp is made in one piece on the bottom of the pot pot, since the inclined ramp can be produced in this way particularly cost by injection molding together with the storage pot. The pot bottom of the storage cup therefore has a bevel formed on it.
Darüber hinaus vorteilhaft ist, wenn das Gehäuse der Saugstrahlpumpe mittels von Haltemitteln am Topfboden fixierbar ist.Moreover, it is advantageous if the housing of the suction jet pump can be fixed by means of holding means on the bottom of the pot.
Desweiteren vorteilhaft ist, wenn am Topfboden eine Aufnahme zur Befestigung der Saugstrahlpumpe vorgesehen ist, da das Gehäuse der Saugstrahlpumpe auf diese Weise besonders einfach am Topfboden des Speichertopfes befestigbar ist.Furthermore, it is advantageous if a receptacle for fixing the suction jet pump is provided on the bottom of the pot, since the housing of the suction jet pump in this way is particularly easy to attach to the bottom of the pot pot.
Weiterhin vorteilhaft ist, wenn der Mischkanal der Saugstrahlpumpe in Richtung des Topfbodens verläuft, da der Wirkungsgrad der Saugstrahlpumpe bei dieser Ausführung höher ist als bei einem senkrecht angeordneten Mischkanal. ZeichnungIt is also advantageous if the mixing channel of the suction jet pump runs in the direction of the pot bottom, since the efficiency of the suction jet pump is higher in this embodiment than in a vertically arranged mixing channel. drawing
Ein Ausführangsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert.An Ausführangsbeispiel the invention is shown in simplified form in the drawing and explained in more detail in the following description.
Fig.1 zeigt im Schnitt eine Vorrichtung zum Fördern von Kraftstoff mit einer erfindungsgemäßen1 shows in section a device for conveying fuel with an inventive
Saugstrahlpumpe und Fig.2 einen Ausschnitt des Topfbodens des Speichertopfes aus Fig.1.Suction jet pump and Figure 2 shows a detail of the pot bottom of the storage cup of Figure 1.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Fig.l zeigt im Schnitt eine Vorrichtung zum Fördern von Kraftstoff mit einer erfindungsgemäßen Saugstrahlpumpe.Fig.l shows in section a device for conveying fuel with a suction jet pump according to the invention.
Die Vorrichtung zum Fördern von Kraftstoff ist in einem Kraftstofftank 1 angeordnet und fördert mittels eines Förderaggregates 2 Kraftstoff aus dem Kraftstofftank 1 druckerhöht über eine Druckleitung 3 zu einer Brennkraftmaschine 4. Das Förderaggregat 2 ist in einem Speichertopf 5 angeordnet, der für das Förderaggregat 2 ausreichend Kraftstoff vorhält, damit dieses auch bei niedrigen Füllständen im Kraftstofftank 1 und beim Beschleunigen, Bremsen, Kurven- und/oder Bergfahren Kraftstoff ansaugen kann. Der Speichertopf 5 hat einen Topfboden 6. Von derThe device for conveying fuel is arranged in a fuel tank 1 and conveyed by means of a delivery unit 2 fuel from the fuel tank 1 druckerhöht via a pressure line 3 to an internal combustion engine 4. The delivery unit 2 is arranged in a storage pot 5, which is sufficient for the delivery unit 2 fuel holds, so that it can suck in fuel even at low levels in the fuel tank 1 and when accelerating, braking, cornering and / or climbing. The storage pot 5 has a pot bottom 6. Of the
Druckleitung 3 zweigt eine Treibleitung 8 ab, die eine Saugstrahlpumpe 9 zum aktiven Befallen des Speichertopfes 5 antreibt. In der Druckleitung 3 bzw. in der Treibleitung 8 kann ein Druckregelventil 10 vorgesehen sein, das erst ab einem vorbestimmten Druck in der Druckleitung 3 Kraftstoff aus der Druckleitung 3 in die Treibleitung 8 abströmen lässt. Stromab der Abzweigung der Treibleitung 8 ist ein Rückschlagventil 11 in der Druckleitung 3 vorgesehen, das ein Rückströmen von Kraftstoff verhindert. Die Treibleitung 8 mündet über einen beispielsweise verengten Strahlausgang 14 in eine Ansaugkammer 15 der Saugstrahlpumpe 9. An die Ansaugkammer 15 schließt sich ein Mischkanal 16 an, der in gedachter Verlängerung des Strahlausgangs 14 angeordnet ist, derart, dass ein aus dem Strahlausgang 14 der Treib leitung 8 austretender Fluidstrahl über die Ansaugkammer 15 geradlinig in den Mischkanal 16 gelangt. Der Mischkanal 16 verläuft horizontal in Richtung des Topfbodens 6.Pressure line 3 branches off a tether 8, which drives a suction jet pump 9 for actively filling the storage cup 5. In the pressure line 3 or in the treble line 8, a pressure regulating valve 10 may be provided, which can only flow off fuel from the pressure line 3 into the tapping line 8 from a predetermined pressure in the pressure line 3. Downstream of the branch of the treble line 8, a check valve 11 is provided in the pressure line 3, which prevents a backflow of fuel. At the suction chamber 15, a mixing channel 16 connects, which is arranged in an imaginary extension of the beam output 14, such that a line from the beam output 14 of the drive 8 exiting fluid jet via the suction chamber 15 rectilinearly passes into the mixing channel 16. The mixing channel 16 extends horizontally in the direction of the bottom of the pot. 6
Die Wirkungsweise der Saugstrahlpumpe 9 ist hinreichend bekannt, so dass diese hier nur kurz beschrieben wird: über die Treibleitung 8 und deren Strahlausgang 14 wird ein Treibstrom strahlförmig in die Ansaugkammer 15 eingeleitet. Der Treibstrahl der Treibleitung 8 reißt umliegenden Kraftstoff aus der Ansaugkammer 15 mit in den Mischkanal 16, so dass sich ein Förderstrom über den Mischkanal 16 in den Speichertopf 5 einstellt. In der Ansaugkammer 15 entsteht ein Unterdruck, der Kraftstoff über eine Ansaugöffnung 17 der Ansaugkammer 15 aus dem - A -The mode of action of the suction jet pump 9 is sufficiently well known, so that it will be described only briefly here: via the tether 8 and its jet outlet 14, a blowing current is introduced into the suction chamber 15 in the form of a jet. The propulsion jet of the haulage line 8 entrains surrounding fuel from the suction chamber 15 into the mixing channel 16, so that a delivery flow is established via the mixing channel 16 into the storage pot 5. In the suction chamber 15 creates a negative pressure, the fuel via a suction port 17 of the suction chamber 15 from the - A -
Kraftstofftank 1 in die Ansaugkammer 15 nachströmen lässt. An der Ansaugöffhung 17 ist ein Ventilglied 18 vorgesehen, das mit der Ansaugöffhung 17 zusammenwirkt und mit dieser ein Rückschlagventil bildet.Fuel tank 1 can flow into the suction chamber 15. At the Ansaugöffhung 17, a valve member 18 is provided which cooperates with the Ansaugöffhung 17 and forms with this a check valve.
Die Ansaugkammer 15 und der Mischkanal 16 sind an einem Gehäuse 19 der Saugstrahlpumpe 9 ausgebildet, wobei die Ansaugkammer 15 zum Topfboden 6 hin offen ist. Der Teil des Gehäuses 19 mit der Ansaugkammer 15 ist am Topfboden 6 angeordnet und schließt die Ansaugöffhung 17 ein. Dadurch wird eine geschlossene Ansaugkammer 15 erreicht, die über die Ansaugöffnung 17 mit dem Kraftstofftank 1 und über den Mischkanal 16 mit dem Speichertopf 5 strömungsverbunden ist. An dem Gehäuse 19 ist auch ein Abschnitt der Treibleitung 8 ausgebildet, der mit dem verengten Strahlausgang 14 in die Ansaugkammer 15 mündet.The suction chamber 15 and the mixing channel 16 are formed on a housing 19 of the suction jet pump 9, wherein the suction chamber 15 is open to the bottom of the pot 6. The part of the housing 19 with the suction chamber 15 is arranged on the bottom of the pot 6 and includes the Ansaugöffhung 17 a. Thereby, a closed suction chamber 15 is reached, which is flow-connected via the suction port 17 to the fuel tank 1 and via the mixing channel 16 with the storage cup 5. On the housing 19, a portion of the treble line 8 is formed, which opens into the suction chamber 15 with the narrowed jet outlet 14.
Erfindungsgemäß ist vorgesehen, dass am Topfboden 6 des Speichertopfes 5 innerhalb der Ansaugkammer 15 am Übergang in den Mischkanal 16 eine Schrägrampe 20 zur turbulenzarmen Strömungsführung vorgesehen ist. Die Schrägrampe 20 verringert die Turbulenzen in der Strömung, so dass insbesondere bei sogenanntem Heißbenzin weniger Gasblasen innerhalb der Saugstrahlpumpe 9 entstehen. Die Schrägrampe 20 wirkt als sogenannter Deflektor und lenkt die Strömung turbulenzarm um.According to the invention, an oblique ramp 20 for low-turbulence flow guidance is provided on the bottom of the pot 6 of the reservoir cup 5 within the suction chamber 15 at the transition into the mixing channel 16. The oblique ramp 20 reduces the turbulence in the flow, so that less gas bubbles arise within the suction jet pump 9, in particular in so-called hot gasoline. The oblique ramp 20 acts as a so-called deflector and deflects the flow with low turbulence.
Die Ansaugöffhung 17 und eine dem Topfboden 6 zugewandte untere Kante 24 am ansaugkammerseitigen Eingang 16.1 in den Mischkanal 16 sind in unterschiedlichen Ebenen angeordnet, wobei die Ebenen mittels der Schrägrampe 20 miteinander verbunden werden. Die Schrägrampe 20 steigt im wesentlichen stetig von der Ebene mit der Ansaugöffhung 17 zur Ebene mit der unteren Kante 24 an. Die Schrägrampe 20 könnte aber auch stufenförmig in mehreren Stufen ansteigend ausgeführt werden. Die Schrägrampe 20 geht im wesentlichen kontinuierlich in den Topfboden 6 über. Das Gehäuse 19 der Saugstrahlpumpe 9 selbst weist einen stufenförmigen Übergang 23 von der Ansaugkammer 15 in den Mischkanal 16 auf, wobei die Schrägrampe 20 des Topfbodens 6 und die untere Kante 24 am Eingang 16.1 des Mischkanals 16 nach der Befestigung des Gehäuses 19 an dem Topfboden 6 im wesentlichen stufenlos aneinander anschließen. In Strömungsrichtung gesehen schließt somit an der höchsten Stelle der Schrägrampe 20 der Mischkanal 16 mit der unteren Kante 24 an, wobei am Übergang zwischen der Schrägrampe 20 und dem Mischkanal 16 ein Anschlussspalt 21 gebildet ist. Die Wanddicke des Topfbodens 6 im Bereich der Schrägrampe 20 ist etwa gleich ausgeführt wie im übrigen Topfboden 6.The Ansaugöffhung 17 and the bottom of the pot 6 facing lower edge 24 at the suction chamber side entrance 16.1 in the mixing channel 16 are arranged in different planes, wherein the planes are connected to each other by means of the oblique ramp 20. The ramp ramp 20 rises substantially continuously from the plane with the Ansaugöffhung 17 to the plane with the lower edge 24 at. However, the oblique ramp 20 could also be designed to increase in stages in several stages. The oblique ramp 20 is essentially continuous in the bottom of the pot 6. The housing 19 of the suction jet pump 9 itself has a step-shaped transition 23 from the suction chamber 15 in the mixing channel 16, wherein the oblique ramp 20 of the pot bottom 6 and the lower edge 24 at the input 16.1 of the mixing channel 16 after attachment of the housing 19 to the pot bottom. 6 essentially steplessly connect to each other. Seen in the flow direction thus includes at the highest point of the oblique ramp 20 of the mixing channel 16 with the lower edge 24, wherein at the transition between the oblique ramp 20 and the mixing channel 16, a connection gap 21 is formed. The wall thickness of the pot bottom 6 in the region of the oblique ramp 20 is approximately the same as in the rest of the pot bottom. 6
Gemäß dem Ausführungsbeispiel ist die Schrägrampe 20 einstückig am Topfboden 6 desAccording to the embodiment, the oblique ramp 20 is integrally formed on the bottom of the pot 6
Speichertopfes 5 ausgeführt. Die Schrägrampe 20 könnte aber auch ein separates Teil sein, das am Topfboden 6 oder an dem Gehäuse 19 der Saugstrahlpumpe 9 befestigt ist. Ebenso kann vorgesehen sein, die Schrägrampe 20 einstückig am Gehäuse 19 der Saugstrahlpumpe 9 auszubilden.Storage cup 5 executed. The oblique ramp 20 could also be a separate part, the am Pot bottom 6 or attached to the housing 19 of the suction jet pump 9. Likewise, it may be provided to form the oblique ramp 20 in one piece on the housing 19 of the suction jet pump 9.
Das Gehäuse 19 ist mittels von Haltemitteln 28 am Topfboden 6 fixiert. Gemäß dem Ausführungsbeispiel ist am Topfboden 6 des Speichertopfes 5 eine Aufnahme 27 für den Teil des Gehäuse 19 mit der Ansaugkammer 15 vorgesehen. Die Aufnahme 27 ist an die Form der Ansaugkammer 15 angepasst, so dass das Gehäuse 19 mit der Ansaugkammer 15 in die Aufnahme 27 einsetzbar ist. Die Saugstrahlpumpe 9 ist in der Aufnahme 27 mittels der Haltemittel 28 fixiert, beispielsweise verrastet. Die Aufnahme 27 umgibt die Ansaugöffnung 17.The housing 19 is fixed by means of holding means 28 on the bottom of the pot 6. According to the embodiment, a receptacle 27 for the part of the housing 19 with the suction chamber 15 is provided on the bottom of the pot 6 of the storage pot 5. The receptacle 27 is adapted to the shape of the suction chamber 15, so that the housing 19 can be inserted with the suction chamber 15 in the receptacle 27. The suction jet pump 9 is fixed in the receptacle 27 by means of the holding means 28, for example, locked. The receptacle 27 surrounds the suction opening 17th
An der dem Kraftstofftank 1 zugewandten Seite des Topfbodens 6 ist beispielsweise ein Grobfilter 30 ausgebildet, der den von der Saugstrahlpumpe 9 angesaugten Kraftstoff stromauf der Ansaugöffnung 17 filtert.At the fuel tank 1 side facing the pot bottom 6, for example, a coarse filter 30 is formed, which filters the sucked by the suction jet 9 fuel upstream of the suction port 17.
Fig.2 zeigt einen Ausschnitt des Topfbodens des Speichertopfes aus Fig.l.2 shows a section of the pot bottom of the storage cup of Fig.l.
Bei der Vorrichtung nach Fig.2 sind die gegenüber der Vorrichtung nach Fig.l gleichbleibenden oder gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet. In the apparatus of Figure 2, the opposite to the device of Fig.l constant or equivalent parts are indicated by the same reference numerals.

Claims

Ansprüche claims
1. Vorrichtung zum Fördern von Kraftstoff, mit einem mittels einer Saugstrahlpumpe befüllbaren Speichertopf, der einen Topfboden mit einer Ansaugöffnung aufweist, die in eine Ansaugkammer der Saugstrahlpumpe mündet und durch die die Saugstrahlpumpe Kraftstoff ansaugt, wobei die Ansaugkammer über einen Mischkanal mit dem Speichertopf strömungsverbunden ist, dadurch gekennzeichnet, dass am Topfboden (6) des Speichertopfes (5) innerhalb der Ansaugkammer (15) am Übergang (23) in den Mischkanal (16) eine Schrägrampe1. An apparatus for conveying fuel, with a fillable by means of a suction jet storage tank having a bottom of a pot with a suction opening into a suction chamber of the suction jet and through which the suction jet pump sucks fuel, wherein the suction chamber is fluidly connected via a mixing channel with the storage pot , characterized in that at the bottom of the pot (6) of the storage pot (5) within the suction chamber (15) at the transition (23) in the mixing channel (16) has an oblique ramp
(20) zur turbulenzarmen Strömungsführung vorgesehen ist.(20) is provided for low-turbulence flow guidance.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Ansaugöffnung (17) und der Eingang (16.1) in den Mischkanal (16) in unterschiedlichen Ebenen angeordnet sind, die mittels der Schrägrampe (20) miteinander verbunden sind.2. Apparatus according to claim 1, characterized in that the suction opening (17) and the input (16.1) are arranged in the mixing channel (16) in different planes which are interconnected by means of the oblique ramp (20).
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Schrägrampe (20) kontinuierlich in den Topfboden (6) übergeht.3. A device according to claim 1, characterized in that the oblique ramp (20) continuously merges into the pot bottom (6).
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Ansaugkammer (15) und der Mischkanal (16) an einem Gehäuse (19) der Saugstrahlpumpe (9) ausgeführt sind, wobei die Ansaugkammer (15) zum Topfboden (6) hin offen ist.4. Apparatus according to claim 1, characterized in that the suction chamber (15) and the mixing channel (16) on a housing (19) of the suction jet pump (9) are executed, wherein the suction chamber (15) to the pot bottom (6) is open ,
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Gehäuse (19) der Saugstrahlpumpe (9) einen stufenförmigen Übergang (23) von der Ansaugkammer (15) in den5. Apparatus according to claim 4, characterized in that the housing (19) of the suction jet pump (9) has a stepped transition (23) from the suction chamber (15) in the
Mischkanal (16) aufweist, an dem die Schrägrampe (20) anschließt.Mixing channel (16), to which the oblique ramp (20) connects.
6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Schrägrampe (20) einstückig am Topfboden (6) des Speichertopfes (5) ausgeführt ist.6. The device according to claim 1, characterized in that the oblique ramp (20) is made in one piece on the bottom of the pot (6) of the storage pot (5).
7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Gehäuse (19) der Saugstrahlpumpe (9) mittels von Haltemitteln (28) am Topfboden (6) fixiert ist.7. The device according to claim 1, characterized in that the housing (19) of the suction jet pump (9) by means of holding means (28) is fixed to the pot bottom (6).
8. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass am Topfboden (6) eine Aufnahme (27) zur Befestigung der Saugstrahlpumpe (9) vorgesehen ist. 8. The device according to claim 1, characterized in that the pot bottom (6) has a receptacle (27) for attachment of the suction jet pump (9) is provided.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Aufnahme (27) die Ansaugöffhung (17) ringförmig umgibt.9. Apparatus according to claim 8, characterized in that the receptacle (27) surrounding the Ansaugöffhung (17) annular.
10. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Mischkanal (16) der Saugstrahlpumpe (9) in Richtung des Topfbodens (6) verläuft. 10. The device according to claim 1, characterized in that the mixing channel (16) of the suction jet pump (9) in the direction of the pot bottom (6).
EP08872994.2A 2008-02-28 2008-12-18 Device for feeding fuel Active EP2257706B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000437A DE102008000437A1 (en) 2008-02-28 2008-02-28 Device for conveying fuel
PCT/EP2008/067870 WO2009106185A1 (en) 2008-02-28 2008-12-18 Device for feeding fuel

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EP2257706A1 true EP2257706A1 (en) 2010-12-08
EP2257706B1 EP2257706B1 (en) 2015-02-25

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US (1) US20110000468A1 (en)
EP (1) EP2257706B1 (en)
CN (1) CN101960135B (en)
DE (1) DE102008000437A1 (en)
WO (1) WO2009106185A1 (en)

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Publication number Publication date
CN101960135B (en) 2013-06-19
US20110000468A1 (en) 2011-01-06
EP2257706B1 (en) 2015-02-25
WO2009106185A1 (en) 2009-09-03
CN101960135A (en) 2011-01-26
DE102008000437A1 (en) 2009-09-03

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