EP1831536A1 - Delivery device for delivering fuel out of a fuel tank - Google Patents

Delivery device for delivering fuel out of a fuel tank

Info

Publication number
EP1831536A1
EP1831536A1 EP05794479A EP05794479A EP1831536A1 EP 1831536 A1 EP1831536 A1 EP 1831536A1 EP 05794479 A EP05794479 A EP 05794479A EP 05794479 A EP05794479 A EP 05794479A EP 1831536 A1 EP1831536 A1 EP 1831536A1
Authority
EP
European Patent Office
Prior art keywords
fuel
net
valve
dadurchgekennzeich
pump
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
EP05794479A
Other languages
German (de)
French (fr)
Other versions
EP1831536B1 (en
Inventor
Lothar Dickenscheid
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1831536A1 publication Critical patent/EP1831536A1/en
Application granted granted Critical
Publication of EP1831536B1 publication Critical patent/EP1831536B1/en
Not-in-force 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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86187—Plural tanks or compartments connected for serial flow
    • Y10T137/86196—Separable with valved-connecting passage

Definitions

  • Conveying device for conveying fuel from a fuel tank
  • the invention relates to a conveyor for conveying fuel from a fuel tank to a Brenn ⁇ engine of a motor vehicle with a Kraftstoffpum ⁇ pe, with a bottom valve having swirl pot and with a suction jet pump, wherein a suction port of the suction jet pump is connected to the fuel tank.
  • the suction jet pump is supplied with fuel as blowing agent via fuel returned by the internal combustion engine or via a branch of the supply line.
  • the suction jet pump is used to deliver fuel from the fuel tank ⁇ in the swirl pot.
  • the promotion of Saug ⁇ jet pump starts only when pump of the fuel ⁇ fuel can be pumped from the surge chamber.
  • a disadvantage of the known conveying device is that a first filling or refilling after a complete emptying of the fuel tank requires a large amount of fuel to be introduced into the fuel tank so that the swirl pot is also filled. Only then the fuel pump can draw fuel and the suction jet pump ⁇ operate. For a very large area of the bottom of the fuel tank, the initial charge requires several liters of fuel. In practice it has been shown that for the initial filling a level of 18 mm in the fuel tank is required so that the fuel pump ansau ⁇ gen can fuel.
  • the invention is based on the problem of the amount of force substance that is necessary during initial filling, reindeer of minimizing ⁇ .
  • the fuel pump is able to suck fuel directly from the fuel tank via the intake connection of the suction jet pump and the mixing tube after a first filling.
  • the suction pressure is sufficient with ein ⁇ switched fuel pump.
  • An operation of the suction jet pump is not required for this purpose.
  • Idle running of the baffle can be according to a ande ⁇ ren advantageous development of the invention is simple vermei ⁇ the is arranged when the bottom valve in the suction port of the ejector ⁇ pump and a negative pressure in the Ansaugan ⁇ circuit of the sucking jet pump in relation to the pressure at the bottom of the fuel tank in the Open position and at a pressure ⁇ balance in the closed position is movable.
  • the fuel pump can suck un ⁇ indirectly from the surge chamber fuel when in a connection of the mixing tube with the swirl pot an opening into the swirl pot overflow valve is arranged.
  • connection of the surge pot to the suction port of the fuel pump is opened in accordance with another advantageous development of the invention even at low levels in the surge pot when the float of the spill valve is located near the bottom of the baffle. This ensures that can be sucked fuel pump with an empty fuel tank near ⁇ to all of the fuel from the surge chamber of the force.
  • the filling of the surge pot is reliably ensured if the relief valve is designed as a pressure relief valve, which at a relative to the pressure in the bottom region of Swirl pot high pressure in the mixing tube opens. As a result, excess fuel conveyed by the suction jet pump flows via the overflow valve into the surge pot.
  • a mixing chamber is arranged when the mixing chamber has a nozzle of the suction jet pump and a connection for the mixing ⁇ pipe of the suction jet pump and when the bottom valve opens into the mixing chamber.
  • the overflow valve could for example also be arranged on the mixing chamber.
  • An intake of fuel from the surge pot by the suction jet pump can be according to another advantageous embodiment of the invention ein ⁇ fold prevent when the overflow valve is arranged on the mixing tube.
  • the bottom valve and / or the overflow valve capable, according to another advantageous development of the invention there are advantages to control when the Bo ⁇ denventil and / or the spill valve abde an opening / ⁇ ADORABLE having plate-shaped member having.
  • a further advantage of this design is that the bottom valve or the overflow valve thereby require a particularly small installation space.
  • the leadership of the plate-shaped member of the bottom valve and / or the spill valve according to another advantageous embodiment of the invention requires a particularly ge wrestle structural complexity when the plate-shaped member is connected to a guide shaft.
  • the Filterele ⁇ ment also allows an exclusive flow of power ⁇ material and prevents in case of leakage of the overflow valve or in an empty swirl pot penetration of air into the mixing tube.
  • the suction jet pump is arranged next to the fuel pump.
  • FIG. 1 shows schematically a sectional view through a
  • FIG. 2 greatly enlarges a partial region of the delivery device from FIG. 1.
  • FIG. 1 shows a fuel tank 1 in a sectional view with a swirl pot 2 arranged therein.
  • a fuel pump 3 is arranged in the swirl pot 2, which fuel is supplied via a feed line 4 to an internal combustion engine. 5 engine of a motor vehicle promotes.
  • a suction jet pump 6 is arranged, which is supplied via a connected to the flow line 4 branch 7 with fuel as a propellant.
  • the eductor 6 comprises a Mün into a mixing chamber 8 ⁇ Dende nozzle 9, and is greatly enlarged in Figure 2 Darge ⁇ represents.
  • the mixing chamber 8 has a connector 10 for a mixing tube 11 and a bottom valve 12.
  • the mixing tube 11 leads to the position shown in Figure 1 fuel pump 3.
  • the bottom valve 12 has a valve body 14, which closes or releases an opening 15 in the bottom of the swirl pot 2. So that the opening 15 in the bottom of the baffle 2 forms a check suction port 16 of the ejector pump 6.
  • the mixing tube 11 has an overflow valve 17 which includes a valve ⁇ body 18 a leading to the surge chamber 2 opening 19 ver ⁇ or releases ,
  • the valve body 18 of the overflow valve 17 is connected to a float 20.
  • the bottom valve 12 and the overflow valve 17 are each covered by a feinma ⁇ cal filter element 21, 22.
  • valve bodies 14, 18 of the spill valve 17 and the bottom valve 12 each have ⁇ wells a plate-shaped member 23, 24 and connected to the plate-shaped member 23, 24 guide shaft 25, 26 is guided by the movement of the plate-shaped member 23, 24 ,
  • the overflow valve 17 is also moved by the float 20 at a corresponding level in the swirl pot 2 in the open position.
  • the suction jet pump 6 sucks fuel through the bottom valve 12 and promotes this in the mixing tube 11 to the fuel pump 3.
  • the fuel pump 3 with empty baffle 2 and a very small amount of fuel in the fuel tank ⁇ 1 draw fuel. If more fuel is delivered from the ejector pump 6 as a fuel pump 3 reaches excess fuel consumed by the over ⁇ strömventil 17 in the surge chamber 2.
  • the over ⁇ strömventil 17 in the surge chamber 2 At sufficiently filled j ⁇ tem surge chamber 2 also moves the float 20, the Koch ⁇ strömventil 17 in the open position.
  • the fine-meshed filter elements 21, 22 are coated with Teflon, for example, and are exclusively permeable to fuel and prevent the passage of air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

The invention relates to a delivery device for delivering fuel out of a fuel tank (1). To this end, a suction connection (13) of a fuel pump (3) is connected to a mixing tube (11) of a sucking jet pump (6). The sucking jet pump (6) sucks fuel out of the fuel tank (1) via a foot valve (12). The mixing tube (11) has an overflow valve (17) that controls a connection to a swirl pot (2). This enables the fuel pump (3) to suck fuel out of the fuel tank (1) when the swirl pot (2) is empty.

Description

Beschreibungdescription
Fördereinrichtung zur Förderung von Kraftstoff aus einem KraftstoffbehälterConveying device for conveying fuel from a fuel tank
Die Erfindung betrifft eine Fördereinrichtung zur Förderung von Kraftstoff aus einem Kraftstoffbehälter zu einer Brenn¬ kraftmaschine eines Kraftfahrzeuges mit einer Kraftstoffpum¬ pe, mit einem ein Bodenventil aufweisenden Schwalltopf und mit einer Saugstrahlpumpe, wobei ein Ansauganschluss der Saugstrahlpumpe mit dem Kraftstoffbehälter verbunden ist.The invention relates to a conveyor for conveying fuel from a fuel tank to a Brenn¬ engine of a motor vehicle with a Kraftstoffpum ¬ pe, with a bottom valve having swirl pot and with a suction jet pump, wherein a suction port of the suction jet pump is connected to the fuel tank.
Solche Fördereinrichtungen werden in heutigen Kraftfahrzeugen häufig eingesetzt und sind aus der Praxis bekannt. Dabei för- dert die Kraftstoffpumpe in der Regel Kraftstoff aus demSuch conveyors are widely used in today's motor vehicles and are known in practice. As a rule, the fuel pump pumps fuel out of the fuel
Schwalltopf über eine Vorlaufleitung zu der Brennkraftmaschi¬ ne. Die Saugstrahlpumpe wird über von der Brennkraftmaschine rückgeführten Kraftstoff oder über einen Abzweig der Vorlauf¬ leitung mit Kraftstoff als Treibmittel versorgt. Die Saug- Strahlpumpe dient zur Förderung von Kraftstoff aus dem Kraft¬ stoffbehälter in den Schwalltopf. Die Förderung der Saug¬ strahlpumpe setzt jedoch erst ein, wenn von der Kraftstoff¬ pumpe Kraftstoff aus dem Schwalltopf gefördert werden kann.Swirl pot via a flow line to the Brennkraftmaschi¬ ne. The suction jet pump is supplied with fuel as blowing agent via fuel returned by the internal combustion engine or via a branch of the supply line. The suction jet pump is used to deliver fuel from the fuel tank ¬ in the swirl pot. However, the promotion of Saug¬ jet pump starts only when pump of the fuel ¬ fuel can be pumped from the surge chamber.
Nachteilig bei der bekannten Fördereinrichtung ist, dass bei einer Erstbefüllung oder bei einem Nachfüllen nach einer völ¬ ligen Entleerung des Kraftstoffbehälters eine große Menge an Kraftstoff in den Kraftstoffbehälter eingefüllt werden muss, damit der Schwalltopf ebenfalls befüllt wird. Erst dann kann die Kraftstoffpumpe Kraftstoff ansaugen und die Saugstrahl¬ pumpe betreiben. Bei einer sehr großen Fläche des Bodens des Kraftstoffbehälters erfordert die Erstbefüllung mehrere Liter an Kraftstoff. In der Praxis hat sich gezeigt, dass für die Erstbefüllung ein Füllstand von 18 mm im Kraftstoffbehälter erforderlich ist, damit die Kraftstoffpumpe Kraftstoff ansau¬ gen kann.A disadvantage of the known conveying device is that a first filling or refilling after a complete emptying of the fuel tank requires a large amount of fuel to be introduced into the fuel tank so that the swirl pot is also filled. Only then the fuel pump can draw fuel and the suction jet pump ¬ operate. For a very large area of the bottom of the fuel tank, the initial charge requires several liters of fuel. In practice it has been shown that for the initial filling a level of 18 mm in the fuel tank is required so that the fuel pump ansau ¬ gen can fuel.
Der Erfindung liegt das Problem zugrunde, die Menge an Kraft- Stoff, die bei der Erstbefüllung notwendig ist, zu minimie¬ ren.The invention is based on the problem of the amount of force substance that is necessary during initial filling, reindeer of minimizing ¬.
Dies wird erfindungsgemäß dadurch gelöst, dass ein Ansaugan- schluss der Kraftstoffpumpe unmittelbar mit einem Mischrohr der Saugstrahlpumpe verbunden ist.This is inventively achieved in that a Ansaugan- circuit of the fuel pump is directly connected to a mixing tube of the suction jet pump.
Durch diese Gestaltung vermag die Kraftstoffpumpe nach einer Erstbefüllung unmittelbar Kraftstoff über den Ansauganschluss der Saugstrahlpumpe und das Mischrohr aus dem Kraftstoffbe- hälter anzusaugen. Hierfür genügt der Saugdruck bei einge¬ schalteter Kraftstoffpumpe. Ein Betrieb der Saugstrahlpumpe ist hierfür nicht erforderlich. Sobald die Kraftstoffpumpe einen ausreichenden Druck aufgebaut hat und Kraftstoff lie¬ fert, wird auch die Saugstrahlpumpe mit Kraftstoff als Treib- mittel versorgt. In der Praxis hat sich gezeigt, dass mit der erfindungsgemäßen Fördereinrichtung für eine Förderung von Kraftstoff eine Füllhöhe von 3 mm im Kraftstoffbehälter aus¬ reicht .As a result of this configuration, the fuel pump is able to suck fuel directly from the fuel tank via the intake connection of the suction jet pump and the mixing tube after a first filling. For this purpose, the suction pressure is sufficient with ein¬ switched fuel pump. An operation of the suction jet pump is not required for this purpose. Once the fuel pump has built up a sufficient pressure and fuel fert lie ¬, the suction jet pump with fuel as a propellant medium is supplied. In practice, it has been found that with the conveyor according to the invention for a delivery of fuel a filling level of 3 mm in the fuel tank ¬ ranges.
Ein Leerlaufen des Schwalltopfes lässt sich gemäß einer ande¬ ren vorteilhaften Weiterbildung der Erfindung einfach vermei¬ den, wenn das Bodenventil im Ansauganschluss der Saugstrahl¬ pumpe angeordnet ist und von einem Unterdruck im Ansaugan¬ schluss der Saugstrahlpumpe gegenüber dem Druck am Boden des Kraftstoffbehälters in die Offenstellung und bei einem Druck¬ gleichgewicht in die Schließstellung bewegbar ist.Idle running of the baffle can be according to a ande ¬ ren advantageous development of the invention is simple vermei¬ the is arranged when the bottom valve in the suction port of the ejector ¬ pump and a negative pressure in the Ansaugan¬ circuit of the sucking jet pump in relation to the pressure at the bottom of the fuel tank in the Open position and at a pressure ¬ balance in the closed position is movable.
Bei leerem Kraftstoffbehälter vermag die Kraftstoffpumpe un¬ mittelbar aus dem Schwalltopf Kraftstoff anzusaugen, wenn in einer Verbindung des Mischrohrs mit dem Schwalltopf ein in den Schwalltopf mündendes Überströmventil angeordnet ist.With an empty fuel tank, the fuel pump can suck un ¬ indirectly from the surge chamber fuel when in a connection of the mixing tube with the swirl pot an opening into the swirl pot overflow valve is arranged.
Die Steuerung des Überströmventils in Abhängigkeit von dem Füllstand im Schwalltopf gestaltet sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung besonders einfach, wenn das Überströmventil einen im Schwalltopf angeordneten Schwimmer hat und von dem Schwimmer oberhalb eines vorgesehe¬ nen Füllstandes im Schwalltopf in die Offenstellung und un- terhalb des vorgesehenen Füllstandes in die Schließstellung schaltbar ist.The control of the spill valve in dependence on the filling level in the swirl pot of the invention particularly designed According to another advantageous further development of simple, when the spill valve has a arranged in the swirl pot float and the float above a pre see ¬ NEN filling level in the swirl pot into the open position and un- can be switched to the closed position below the intended level.
Die Verbindung des Schwalltopfes mit dem Ansauganschluss der Kraftstoffpumpe wird gemäß einer anderen vorteilhaften Wei- terbildung der Erfindung bereits bei niedrigen Füllständen im Schwalltopf geöffnet, wenn der Schwimmer des Überströmventils nahe dem Boden des Schwalltopfes angeordnet ist. Hierdurch wird sichergestellt, dass bei leerem Kraftstoffbehälter nahe¬ zu der gesamte Kraftstoff aus dem Schwalltopf von der Kraft- stoffpumpe abgesaugt werden kann.The connection of the surge pot to the suction port of the fuel pump is opened in accordance with another advantageous development of the invention even at low levels in the surge pot when the float of the spill valve is located near the bottom of the baffle. This ensures that can be sucked fuel pump with an empty fuel tank near ¬ to all of the fuel from the surge chamber of the force.
Sofern im Normalbetrieb die Saugstrahlpumpe mehr Kraftstoff fördert als die Kraftstoffpumpe verbraucht, wird gemäß einer anderen vorteilhaften Weiterbildung der Erfindung die Befül- lung des Schwalltopfes zuverlässig sichergestellt, wenn das Überströmventil als Überdruckventil ausgebildet ist, welches sich bei einem im Verhältnis zu dem Druck im Bodenbereich des Schwalltopfes hohen Druck im Mischrohr öffnet. Hierdurch strömt von der Saugstrahlpumpe geförderter, überschüssiger Kraftstoff über das Überströmventil in den Schwalltopf.If, in normal operation, the ejector pump delivers more fuel than the fuel pump consumes, according to another advantageous development of the invention, the filling of the surge pot is reliably ensured if the relief valve is designed as a pressure relief valve, which at a relative to the pressure in the bottom region of Swirl pot high pressure in the mixing tube opens. As a result, excess fuel conveyed by the suction jet pump flows via the overflow valve into the surge pot.
Die wahlweise Führung von von der Saugstrahlpumpe gefördertem und über das Bodenventil einströmendem Kraftstoff zu der Kraftstoffpumpe erfordert gemäß einer anderen vorteilhaften Weiterbildung der Erfindung einen besonders geringen kon- struktiven Aufwand, wenn im Bodenbereich des Schwalltopfes eine Mischkammer angeordnet ist, wenn die Mischkammer eine Düse der Saugstrahlpumpe und einen Anschluss für das Misch¬ rohr der Saugstrahlpumpe aufweist und wenn das Bodenventil in die Mischkammer mündet.The selective guidance of fuel delivered by the suction jet pump and flowing in via the bottom valve to the fuel pump requires, according to another advantageous embodiment of the invention, a particularly low conflict of interest. structural effort when in the bottom region of the baffle a mixing chamber is arranged when the mixing chamber has a nozzle of the suction jet pump and a connection for the mixing ¬ pipe of the suction jet pump and when the bottom valve opens into the mixing chamber.
Das Überströmventil könnte beispielsweise ebenfalls an der Mischkammer angeordnet sein. Ein Ansaugen von Kraftstoff aus dem Schwalltopf durch die Saugstrahlpumpe lässt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung ein¬ fach verhindern, wenn das Überströmventil an dem Mischrohr angeordnet ist.The overflow valve could for example also be arranged on the mixing chamber. An intake of fuel from the surge pot by the suction jet pump can be according to another advantageous embodiment of the invention ein¬ fold prevent when the overflow valve is arranged on the mixing tube.
Das Bodenventil und/oder das Überströmventil vermögen gemäß einer anderen vorteilhaften Weiterbildung der Erfindung kurz¬ zeitig große Strömungsquerschnitte zu steuern, wenn das Bo¬ denventil und/oder das Überströmventil ein eine Öffnung abde¬ ckendes tellerförmiges Bauteil aufweisen/aufweist. Ein weite¬ rer Vorteil dieser Gestaltung besteht darin, dass das Boden- ventil oder das Überströmventil hierdurch einen besonders ge¬ ringen Bauraum benötigen.The bottom valve and / or the overflow valve capable, according to another advantageous development of the invention kurz¬ time large flow cross sections to control when the Bo ¬ denventil and / or the spill valve abde an opening / ¬ ADORABLE having plate-shaped member having. A further advantage of this design is that the bottom valve or the overflow valve thereby require a particularly small installation space.
Die Führung des tellerförmigen Bauteils des Bodenventils und/oder des Überströmventils erfordert gemäß einer anderen vorteilhaften Weiterbildung der Erfindung einen besonders ge¬ ringen baulichen Aufwand, wenn das tellerförmige Bauteil mit einem Führungsschaft verbunden ist.The leadership of the plate-shaped member of the bottom valve and / or the spill valve according to another advantageous embodiment of the invention requires a particularly ge wrestle structural complexity when the plate-shaped member is connected to a guide shaft.
Bei leerem Kraftstoffbehälter lässt sich ein Ansaugen von Luft durch die Saugstrahlpumpe einfach vermeiden, wenn das Bodenventil von einem feinmaschigen Filterelement abgedeckt ist. Solche feinmaschigen Filterelemente ermöglichen einen Durchlass von Kraftstoff, sperren oder drosseln jedoch einen Durchlass von Luft und sind bei Fördereinrichtungen für Kraftstoff allgemein bekannt. In der Regel weisen solche feinmaschigen Filterelemente zudem eine Beschichtung aus Tef¬ lon auf. Weiterhin wird bei leerem Kraftstoffbehälter ein An¬ saugen von Luft durch die Auslegung der Saugstrahlpumpe mit geringer Leistung vermieden. Eine entsprechend leistungs- schwache Saugstrahlpumpe vermag keine Luft anzusaugen.When the fuel tank is empty, suction of air through the suction jet pump can be easily avoided if the bottom valve is covered by a fine-meshed filter element. Such fine mesh filter elements allow passage of fuel, but block or restrict passage of air and are well known in fuel delivery systems. In general, such feinmaschigen filter elements also a coating of Tef¬ lon on. Furthermore, an intake of air through the design of the suction jet pump with low power is avoided when the fuel tank is empty. A correspondingly low-powered suction jet pump can not suck in air.
Ein Eintrag von Schmutz in das Mischrohr lässt sich gemäß ei¬ ner anderen vorteilhaften Weiterbildung der Erfindung einfach vermeiden, wenn das Überströmventil von einem feinmaschigen Filterelement abgedeckt ist. Damit ermöglicht das Filterele¬ ment ebenfalls ein ausschließliches Durchströmen mit Kraft¬ stoff und verhindert bei einer Leckage des Überströmventils oder bei leerem Schwalltopf ein Eindringen von Luft in das Mischrohr.An entry of dirt into the mixing tube can be according to ei¬ ner other advantageous development of the invention easily avoided if the spill valve is covered by a fine-meshed filter element. Thus, the Filterele ¬ ment also allows an exclusive flow of power ¬ material and prevents in case of leakage of the overflow valve or in an empty swirl pot penetration of air into the mixing tube.
Zur Verringerung der Bauhöhe der erfindungsgemäßen Förderein¬ richtung trägt es bei, wenn die Saugstrahlpumpe neben der Kraftstoffpumpe angeordnet ist.To reduce the overall height of the conveying device according to the invention, it is beneficial if the suction jet pump is arranged next to the fuel pump.
Die Erfindung lässt zahlreiche Ausführungsformen zu. Zur wei¬ teren Verdeutlichung ihres Grundprinzips ist eine davon in der Zeichnung dargestellt und wird nachfolgend beschrieben. Diese zeigt inThe invention allows numerous embodiments. For further clarification of its basic principle, one of them is shown in the drawing and will be described below. This shows in
Figur 1 schematisch eine Schnittdarstellung durch einen1 shows schematically a sectional view through a
Kraftstoffbehälter mit einer erfindungsgemäßen Fördereinrichtung,Fuel tank with a conveyor according to the invention,
Figur 2 stark vergrößert einen Teilbereich der Förderein- richtung aus Figur 1.FIG. 2 greatly enlarges a partial region of the delivery device from FIG. 1.
Figur 1 zeigt einen Kraftstoffbehälter 1 in einer Schnittdar¬ stellung mit einem darin angeordneten Schwalltopf 2. In dem Schwalltopf 2 ist eine Kraftstoffpumpe 3 angeordnet, welche Kraftstoff über eine Vorlaufleitung 4 zu einer Brennkraftma- schine 5 eines Kraftfahrzeuges fördert. Weiterhin ist in dem Schwalltopf 2 eine Saugstrahlpumpe 6 angeordnet, welche über einen an der Vorlaufleitung 4 angeschlossenen Abzweig 7 mit Kraftstoff als Treibmittel versorgt wird.FIG. 1 shows a fuel tank 1 in a sectional view with a swirl pot 2 arranged therein. A fuel pump 3 is arranged in the swirl pot 2, which fuel is supplied via a feed line 4 to an internal combustion engine. 5 engine of a motor vehicle promotes. Furthermore, in the swirl pot 2, a suction jet pump 6 is arranged, which is supplied via a connected to the flow line 4 branch 7 with fuel as a propellant.
Die Saugstrahlpumpe 6 weist eine in eine Mischkammer 8 mün¬ dende Düse 9 auf und ist in Figur 2 stark vergrößert darge¬ stellt. Die Mischkammer 8 hat einen Anschluss 10 für ein Mischrohr 11 und ein Bodenventil 12. Das Mischrohr 11 führt zu der in Figur 1 dargestellten Kraftstoffpumpe 3. Damit bil¬ det das strömungsseitige Ende des Mischrohres 11 einen An- sauganschluss 13 der Kraftstoffpumpe 3. Das Bodenventil 12 weist einen Ventilkörper 14 auf, welcher eine Öffnung 15 im Boden des Schwalltopfes 2 verschließt oder freigibt. Die Öff- nung 15 im Boden des Schwalltopfes 2 bildet damit einen An- sauganschluss 16 der Saugstrahlpumpe 6. Das Mischrohr 11 weist ein Überströmventil 17 auf, welches mit einem Ventil¬ körper 18 eine zu dem Schwalltopf 2 führende Öffnung 19 ver¬ schließt oder freigibt. Der Ventilkörper 18 des Überströmven- tils 17 ist mit einem Schwimmer 20 verbunden. Das Bodenventil 12 und das Überströmventil 17 sind jeweils von einem feinma¬ schigen Filterelement 21, 22 abgedeckt. Die Ventilkörper 14, 18 des Überströmventils 17 und des Bodenventils 12 weisen je¬ weils ein tellerförmiges Bauteil 23, 24 und einen mit dem tellerförmigen Bauteil 23, 24 verbundenen Führungsschaft 25, 26 auf, durch den die Bewegung des tellerförmigen Bauteils 23, 24 geführt ist. Im einfachsten Fall sind die Ventilkörper 14, 18 jeweils vollständig aus gummielastischem Material ge¬ fertigt, verschließen in Ruhestellung die jeweilige Öffnung 15, 19 und werden bei entsprechenden Differenzdruck von der Öffnung 15, 19 wegbewegt. Das Überströmventil 17 wird durch den Schwimmer 20 zudem bei entsprechendem Füllstand im Schwalltopf 2 in die Offenstellung bewegt. Wenn die in Figur 1 dargestellte Kraftstoffpumpe 3 Kraftstoff aus dem Mischrohr 11 in die Vorlaufleitung 4 fördert, gelangt über den Abzweig 7 Kraftstoff zu der Saugstrahlpumpe 6. Die Saugstrahlpumpe 6 saugt Kraftstoff über das Bodenventil 12 an und fördert diesen in das Mischrohr 11 zu der Kraftstoffpumpe 3. Damit kann die Kraftstoffpumpe 3 bei leerem Schwalltopf 2 und einer sehr geringen Menge an Kraftstoff in dem Kraft¬ stoffbehälter 1 Kraftstoff ansaugen. Wird mehr Kraftstoff von der Saugstrahlpumpe 6 gefördert als die Kraftstoffpumpe 3 verbraucht, gelangt überschüssiger Kraftstoff durch das Über¬ strömventil 17 in den Schwalltopf 2. Bei ausreichend gefüll¬ tem Schwalltopf 2 bewegt zudem der Schwimmer 20 das Über¬ strömventil 17 in die Offenstellung. Damit kann die Kraft¬ stoffpumpe 3 Kraftstoff zudem aus dem Schwalltopf 2 ansaugen. Die feinmaschigen Filterelemente 21, 22 sind beispielsweise mit Teflon beschichtet und sind ausschließlich durchlässig für Kraftstoff und verhindern ein Passieren von Luft. The eductor 6 comprises a Mün into a mixing chamber 8 ¬ Dende nozzle 9, and is greatly enlarged in Figure 2 Darge ¬ represents. The mixing chamber 8 has a connector 10 for a mixing tube 11 and a bottom valve 12. The mixing tube 11 leads to the position shown in Figure 1 fuel pump 3. To ensure that det bil ¬ the flow-side end of the mixing tube 11 a check suction port 13 of the fuel pump 3. The bottom valve 12 has a valve body 14, which closes or releases an opening 15 in the bottom of the swirl pot 2. So that the opening 15 in the bottom of the baffle 2 forms a check suction port 16 of the ejector pump 6. The mixing tube 11 has an overflow valve 17 which includes a valve ¬ body 18 a leading to the surge chamber 2 opening 19 ver ¬ or releases , The valve body 18 of the overflow valve 17 is connected to a float 20. The bottom valve 12 and the overflow valve 17 are each covered by a feinma ¬ cal filter element 21, 22. The valve bodies 14, 18 of the spill valve 17 and the bottom valve 12 each have ¬ weils a plate-shaped member 23, 24 and connected to the plate-shaped member 23, 24 guide shaft 25, 26 is guided by the movement of the plate-shaped member 23, 24 , In the simplest case, the valve body 14, 18, respectively, completely made of rubber-elastic material ge ¬, closed in the rest position the respective opening 15, 19 and are at corresponding differential pressure of the opening 15, moved away 19th The overflow valve 17 is also moved by the float 20 at a corresponding level in the swirl pot 2 in the open position. When the fuel pump 3 shown in Figure 1 promotes fuel from the mixing tube 11 in the flow line 4, passes through the branch 7 fuel to the suction jet pump 6. The suction jet pump 6 sucks fuel through the bottom valve 12 and promotes this in the mixing tube 11 to the fuel pump 3. Thus, the fuel pump 3 with empty baffle 2 and a very small amount of fuel in the fuel tank ¬ 1 draw fuel. If more fuel is delivered from the ejector pump 6 as a fuel pump 3 reaches excess fuel consumed by the over ¬ strömventil 17 in the surge chamber 2. At sufficiently filled j ¬ tem surge chamber 2 also moves the float 20, the Über¬ strömventil 17 in the open position. In order for the fuel pump ¬ 3 can also suck fuel from the swirl pot 2. The fine-meshed filter elements 21, 22 are coated with Teflon, for example, and are exclusively permeable to fuel and prevent the passage of air.

Claims

Patentansprüche claims
1. Fördereinrichtung zur Förderung von Kraftstoff aus einem Kraftstoffbehälter zu einer Brennkraftmaschine eines Kraftfahrzeuges mit einer Kraftstoffpumpe, mit einem ein Bodenventil aufweisenden Schwalltopf und mit einer Saug¬ strahlpumpe, wobei ein Ansauganschluss der Saugstrahl¬ pumpe mit dem Kraftstoffbehälter verbunden ist, d a ¬ d u r c h g e k e n n z e i c h n e t , dass ein Ansaug- anschluss (13) der Kraftstoffpumpe (3) unmittelbar mit einem Mischrohr (11) der Saugstrahlpumpe (6) verbunden ist .1. conveying device for conveying fuel from a fuel tank to an internal combustion engine of a motor vehicle with a fuel pump, with a bottom valve having swirl pot and with a suction ¬ jet pump, wherein a suction port of the suction jet ¬ pump is connected to the fuel tank, ¬ characterized in that an intake port (13) of the fuel pump (3) is directly connected to a mixing tube (11) of the suction jet pump (6).
2. Fördereinrichtung nach Anspruch 1, d a d u r c h g e - k e n n z e i c h n e t , dass das Bodenventil (12) im2. Conveying device according to claim 1, characterized in that the bottom valve (12) in the
Ansauganschluss (16) der Saugstrahlpumpe (6) angeordnet ist und von einem Unterdruck im Ansauganschluss (16) der Saugstrahlpumpe (6) gegenüber dem Druck am Boden des Kraftstoffbehälters (1) in die Offenstellung und bei ei- nem Druckgleichgewicht in die Schließstellung bewegbar ist .Suction port (16) of the suction jet pump (6) is arranged and from a negative pressure in the suction port (16) of the suction jet pump (6) relative to the pressure at the bottom of the fuel tank (1) in the open position and at a pressure equilibrium in the closed position is movable.
3. Fördereinrichtung nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , dass in einer Verbindung des Mischrohres (11) mit dem Schwalltopf (2) ein in den3. Conveying device according to claim 1 or 2, characterized in that in a connection of the mixing tube (11) with the swirl pot (2) in the
Schwalltopf (2) mündendes Überströmventil (17) angeord¬ net ist.Swirl pot (2) opening overflow valve (17) angeord ¬ net is.
4. Fördereinrichtung nach zumindest einem der vorhergehen- den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass das Überströmventil (17) einen im Schwall¬ topf (2) angeordneten Schwimmer (20) hat und von dem Schwimmer (20) oberhalb eines vorgesehenen Füllstandes im Schwalltopf (2) in die Offenstellung und unterhalb des vorgesehenen Füllstandes in die Schließstellung schaltbar ist.4. conveying device according to at least one of the preceding claims, dadurchgekennzeich ¬ net that the overflow valve (17) has a Schwall ¬ pot (2) arranged float (20) and of the float (20) above a designated level in the swirl pot ( 2) in the open position and below the proposed level is switchable to the closed position.
5. Fördereinrichtung nach zumindest einem der vorhergehen- den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass der Schwimmer (20) des Überströmventils (17) nahe dem Boden des Schwalltopfes (2) angeordnet ist .5. A conveyor according to at least one of the preceding claims, dadurchgekennzeich ¬ net, that the float (20) of the overflow valve (17) near the bottom of the swirl pot (2) is arranged.
6. Fördereinrichtung nach zumindest einem der vorhergehen¬ den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass das Überströmventil (17) als Überdruckven¬ til ausgebildet ist, welches sich bei einem im Verhält¬ nis zu dem Druck im Bodenbereich des Schwalltopfes (2) hohen Druck im Mischrohr (11) öffnet.6. conveyor dadurchgekennzeich ¬ net that the spill valve (17) is formed ¬ til as Überdruckven according to at least one of the previous ¬ the claims, which is at a high in behaves ¬ nis to the pressure in the bottom region of the swirl pot (2) pressure in the Mixing tube (11) opens.
7. Fördereinrichtung nach zumindest einem der vorhergehen¬ den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass im Bodenbereich des Schwalltopfes (2) eine Mischkammer (8) angeordnet ist, dass die Mischkammer (8) eine Düse (9) der Saugstrahlpumpe (6) und einen An- schluss (10) für das Mischrohr (11) der Saugstrahlpumpe (6) aufweist und dass das Bodenventil (12) in die Misch¬ kammer (8) mündet.7. A conveyor according to at least one of the previous ¬ claims, dadurchgekennzeich ¬ net that a mixing chamber (8) is arranged in the bottom region of the swirl pot (2), that the mixing chamber (8) has a nozzle (9) of the suction jet pump (6) and a Connection (10) for the mixing tube (11) of the suction jet pump (6) and that the bottom valve (12) opens into the mixing ¬ chamber (8).
8. Fördereinrichtung nach zumindest einem der vorhergehen¬ den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass das Überströmventil (17) an dem Mischrohr8. conveying device according to at least one of the preceding ¬ claims, dadurchgekennzeich ¬ net, that the overflow valve (17) on the mixing tube
(11) angeordnet ist.(11) is arranged.
9. Fördereinrichtung nach zumindest einem der vorhergehen¬ den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass das Bodenventil (12) und/oder das Über¬ strömventil (17) ein eine Öffnung (15, 19) abdeckendes, tellerförmiges Bauteil (23, 24) aufweisen/aufweist. 9. Conveying device according to at least one of the preceding claims ¬ , dadurchgekennzeich ¬ net, that the bottom valve (12) and / or the over ¬ flow valve (17) has an opening (15, 19) covering, plate-shaped component (23, 24) /having.
10. Fördereinrichtung nach zumindest einem der vorhergehen¬ den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass das tellerförmige Bauteil (23, 24) mit ei¬ nem Führungsschaft (25, 26) verbunden ist.10. conveyor according to at least one of the preceding ¬ claims, dadurchgekennzeich ¬ net, that the plate-shaped member (23, 24) with egg ¬ NEM guide shaft (25, 26) is connected.
11. Fördereinrichtung nach zumindest einem der vorhergehen¬ den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass das Bodenventil (12) von einem feinmaschi¬ gen Filterelement (21) abgedeckt ist.11 conveyor, dadurchgekennzeich ¬ net that the foot valve is covered (12) by a gene feinmaschi ¬ filter element (21) according to at least one of the previous ¬ the claims.
12. Fördereinrichtung nach zumindest einem der vorhergehen¬ den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass das Überströmventil (17) von einem feinma¬ schigen Filterelement (22) abgedeckt ist12, the conveyor claims, dadurchgekennzeich ¬ net that the spill valve (17) is covered by a feinma ¬ schigen filter element (22) according to at least one of the previous ¬
13. Fördereinrichtung nach zumindest einem der vorhergehen¬ den Ansprüche, d a d u r c h g e k e n n z e i c h ¬ n e t , dass die Saugstrahlpumpe (6) neben der Kraft¬ stoffpumpe (3) angeordnet ist. 13. Conveying device according to at least one of the preceding claims ¬ , dadurchgekennzeich ¬ net, that the suction jet pump (6) in addition to the fuel pump ¬ (3) is arranged.
EP05794479A 2004-11-17 2005-10-10 Delivery device for delivering fuel out of a fuel tank Not-in-force EP1831536B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410055442 DE102004055442A1 (en) 2004-11-17 2004-11-17 Conveying device for conveying fuel from a fuel tank
PCT/EP2005/055117 WO2006053803A1 (en) 2004-11-17 2005-10-10 Delivery device for delivering fuel out of a fuel tank

Publications (2)

Publication Number Publication Date
EP1831536A1 true EP1831536A1 (en) 2007-09-12
EP1831536B1 EP1831536B1 (en) 2008-06-11

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ID=35457527

Family Applications (1)

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EP05794479A Not-in-force EP1831536B1 (en) 2004-11-17 2005-10-10 Delivery device for delivering fuel out of a fuel tank

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US (1) US7658181B2 (en)
EP (1) EP1831536B1 (en)
DE (2) DE102004055442A1 (en)
ES (1) ES2308557T3 (en)
WO (1) WO2006053803A1 (en)

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Also Published As

Publication number Publication date
EP1831536B1 (en) 2008-06-11
WO2006053803A1 (en) 2006-05-26
DE502005004428D1 (en) 2008-07-24
DE102004055442A1 (en) 2006-05-24
ES2308557T3 (en) 2008-12-01
US7658181B2 (en) 2010-02-09
US20090064973A1 (en) 2009-03-12

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