EP1607635A1 - Device for pumping fuel - Google Patents

Device for pumping fuel Download PDF

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Publication number
EP1607635A1
EP1607635A1 EP20050104940 EP05104940A EP1607635A1 EP 1607635 A1 EP1607635 A1 EP 1607635A1 EP 20050104940 EP20050104940 EP 20050104940 EP 05104940 A EP05104940 A EP 05104940A EP 1607635 A1 EP1607635 A1 EP 1607635A1
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EP
European Patent Office
Prior art keywords
fuel
channel
mixing channels
mixing
nozzles
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
EP20050104940
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German (de)
French (fr)
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EP1607635B1 (en
Inventor
Stephan Kleppner
Hans-Peter Braun
Thomas Wieland
Ludger Kuermann
Winfried Eckart
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1607635A1 publication Critical patent/EP1607635A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/466—Arrangements of nozzles with a plurality of nozzles arranged in parallel
    • 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
    • Y10T137/85978—With pump
    • Y10T137/86075—And jet-aspiration type pump
    • 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
    • Y10T137/87265—Dividing into parallel flow paths with recombining

Definitions

  • the invention relates to a device for conveying fuel according to the preamble of the main claim. It is already a device for conveying fuel from DE 42 19 516 A1 known with at least two Saugstrahlpumpen, each having a drive nozzle and a mixing nozzle arranged downstream of the drive nozzle.
  • the disadvantage is that the parallel suction jet pumps require a lot of space, are very solid and therefore require much injection molding compound for production.
  • Devices for conveying fuel with a single suction jet pump such as for example, in DE 43 38 504 C2, have the disadvantage that the Delivery rate of the suction jet pump is not sufficient under certain operating conditions, a arranged in a storage tank pump with enough fuel to supply.
  • the inventive device for conveying fuel with the characterizing Features of the main claim has the advantage that in a simple way and An improvement is achieved in that the production costs be reduced by moving the motive nozzles of a single one in the flow direction conically narrowing, upstream of the mixing channels arranged collecting channel are surrounded.
  • the catching channel limits a suction chamber and the Fuel from the suction chamber leads into the mixing channels, since the propulsion jets in the Vacuum generating a vacuum and in this way fuel over the Aspirate suction channel into the suction chamber.
  • the sucked fuel is from the Driving jets entrained in the mixing channels.
  • the cross section of the diffuser is 8-shaped, since the Suction jet pumps can be arranged in this way very close to each other and thus require very little space. Besides, this will do little Injection molding material needed, so that the production costs are reduced.
  • each motive nozzle is one of Associated mixing channels and the driving nozzles are with respect to the associated Mixing channel arranged concentrically.
  • FIG. 1 shows a sectional view a device for conveying fuel with two inventive Suction jet pumps and Fig.2 the two Saugstrahlpumpen invention according to Fig.1 in a top view.
  • Fig. 1 shows in section a device for conveying fuel with two Suction jet pumps according to the invention.
  • the device according to the invention has several suction jet pumps 1 each with onemaschinedüse 2 and a mixing channel 3.
  • the suction jet pumps 1 are for example in a common housing 1.1 provided, for example, made of plastic and made by injection molding.
  • two suction jet pumps 1 on formed the housing 1.1 but it can also express more than two Suction jet pumps 1 be integrated in the housing 1.1.
  • the motive nozzles 2 are designed, for example, as a nozzle-like constriction.
  • the Propulsion nozzles 2 are upstream with a drive line 4 and downstream with a common Suction chamber 6 connected. Via the haulage line 4, each motive nozzle 2 becomes fuel supplied, which in each case via a nozzle opening 5 as a propulsion jet into the suction chamber. 6 arrives. Downstream of the suction chamber 6, the mixing channels 3 are arranged.
  • the housing 1.1 with the suction jet pumps 1 is for example in one Storage tank 8 is arranged.
  • the Saugstrahlpumpen 1 promote fuel from a Reservoir 9 in the storage container 8.
  • the storage container 8 is within the Reservoir 9, for example, near a tank bottom 10 of the reservoir. 9 arranged.
  • the mixing channels 3 extend, for example, in the direction of the tank bottom 10, which also is referred to as a horizontal arrangement of the suction jet pumps 1. A respect to the Tank bottom 10 vertical or referred to as standing arrangement of However, mixing channels 3 is also possible.
  • the treble line 4 is for example via a pressure control valve 11 with a pressure line 12 fluidly connected, starting from a delivery unit 15 to a Internal combustion engine 16 runs and supplies them with fuel.
  • the delivery unit 15 is arranged, for example, in the storage container 8 and sucks fuel through a Suction line 17, in which, for example, a pre-filter 18 is provided, and promotes this pressure increases via the pressure line 12 to the engine 16.
  • a main filter 19 is provided in the fuel contained fine dirt particles filters out. From the pressure line 12, for example downstream of the main filter 19, the tether 4 branches off and supplies the Suction jet pumps 1 with open pressure control valve 11 with fuel.
  • the Pressure control valve 11 opens when the pressure in the pressure line 12 a predetermined Value exceeds and allows excess fuel from the pressure line 12 over the Trebön 4 and the driving nozzles 2 in the suction chamber 6 and the mixing channels. 3 the suction jet pumps 1 flow back into the storage container 8.
  • the Suction jet pumps 1 but can expressly fed via a return line Be the excess fuel from the engine 16 back in the Reservoir 8 promotes.
  • the suction jet pump 1 directly with the Pressure line 12 both upstream and downstream of the main filter 19th be flow-connected, wherein the pressure of the pressure line 12, for example by a throttle is lowered.
  • the suction jet pumps 1 suck in a known manner fuel from the Reservoir 9, wherein the fuel via an intake passage 22 in the Suction chamber 6 of the suction jet pumps 1 passes.
  • the intake passage 22 is for example, by a gap between a hollow cylinder 21 of the housing 1.1 and arranged in the hollow cylinder 21, branched to the driving nozzles 2 Sections of the Trebtechnisch 4 formed.
  • the fuel of the haulage line 4 passes through the nozzle openings 5 of the driving nozzles 2 as so-called propulsion jet into the suction chamber 6, wherein the propulsion jets of the Examdüsen 2 starting from the suction chamber 6 and each pass to one of extend to the suction chamber 6 subsequent mixing channels 3. Every jet one of the drive nozzles 2 ruptures fuel from the suction chamber 6 into the drive nozzle 2 associated mixing channel 3, so that in the suction chamber 6, a negative pressure, the fuel from the reservoir 9 via the intake passage 22 into the suction chamber 6 can flow.
  • the fuel of the propulsion jets and the entrained fuel the Suction chamber 6 and / or the mixing channels 3 flows through the mixing channels 3 and respectively an outlet opening 23 of the mixing channel 3, for example, in a common Diffuser 25, which opens via a diffuser outlet 26 into the storage container 8.
  • diffuser 25 widens in the flow direction, so that the Flow rate of the fuel and the flow noise is reduced become.
  • the mixing channels 3 can also directly into the Lead storage container 8.
  • the mixing channels 3 are arranged side by side and each have a channel axis 30 on.
  • the channel axes 30 of the mixing channels 3 each extend in the same direction and are arranged, for example, parallel to each other.
  • Each mixing channel 3 is a Hatching nozzle 2 assigned.
  • the mixing channels 3 and the driving nozzles 2 are for example arranged concentrically with each other so that the emerging from the motive nozzle 2 Drive jet each passes into the associated mixing channel 3 and ideally with the Channel axis 30 of the associated mixing channel 3 is aligned.
  • the driving nozzles 2 are of a single in the flow direction conically narrowing, upstream of the mixing channels 3 arranged collecting channel 31 surrounded.
  • the collecting channel 31 is formed, for example, by a hollow cone 33 which adjoins the Hollow cylinder 21 of the housing 1.1 connects in the flow direction.
  • the catch channel 31 limits the suction chamber 6 in the radial direction transversely to the flow direction and conducts the fuel of the propulsion jets and the entrained fuel from the suction chamber 6 in the mixing channels.
  • each ejector pump 1 motive nozzle 2 is about the fishing channel 31 with the associated mixing channel 3 mechanically connected, for example by not illustrated bridges.
  • the driving nozzles 2 are arranged in the catching channel 31. For example, they are one-piece connected to each other and provided in a common nozzle housing 1.2.
  • the Nozzle housing 1.2 for example, part of the housing 1.1.
  • the mixing channels 3 are, for example, integrally connected to each other and on the Housing 1.1 formed.
  • the suction jet pumps 1 can be particularly simple and produce inexpensively.
  • the partition wall 32 extends For example, from the suction chamber 6 facing the end in the direction of Channel axes 30 up to the diffuser 25 facing the end of the mixing channels 3 and can protrude both sides both in the suction chamber 6 and in the diffuser 25. Since the dividing wall 32 ends in the region of the outlet openings 23 of the mixing channels, the mixing channels 3 open into a single channel forming the diffuser 25.
  • the Partition 32 is as a common mixing channel wall for every two adjacent Mischkanäle 3 formed and executed, for example curved.
  • the intake passage 22 is cylindrical, for example, the collecting channel 31 conical, the Mixture channels 3 cylindrical and the common diffuser 25 conical.
  • FIG. 2 shows the suction jet pump according to the invention according to Figure 1 in a plan view.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

The injector pump (1) has two drive air nozzles (2) side-by-side in a common nozzle body (1.2) in a common cone (31,33). The air and fuel enter two separate mixing pipes (3) side-by-side. On leaving the mixing pipes the air-fuel mixture enters a diffuser cone (25). Fuel is drawn from a tank (8) into a space (22) between a cylindrical entrance portion (21) and the nozzle body. The air supply has a preliminary filter (18), a pump (15) driven by the internal combustion engine (16), and a main filter (19). The air flows through a pressure control valve (11).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Vorrichtung zum Fördern von Kraftstoff nach der Gattung des Hauptanspruchs.
Es ist schon eine Vorrichtung zum Fördern von Kraftstoff aus der DE 42 19 516 A1 bekannt mit zumindest zwei Saugstrahlpumpen, die jeweils eine Treibdüse und einen stromab der Treibdüse angeordneten Mischkanal aufweisen. Nachteilig ist, dass die parallel angeordneten Saugstrahlpumpen viel Bauraum erfordern, sehr massiv ausgebildet sind und daher viel Spritzgußmasse zur Herstellung benötigen.The invention relates to a device for conveying fuel according to the preamble of the main claim.
It is already a device for conveying fuel from DE 42 19 516 A1 known with at least two Saugstrahlpumpen, each having a drive nozzle and a mixing nozzle arranged downstream of the drive nozzle. The disadvantage is that the parallel suction jet pumps require a lot of space, are very solid and therefore require much injection molding compound for production.

Vorrichtungen zum Fördern von Kraftstoff mit einer einzigen Saugstrahlpumpe, wie beispielsweise in der DE 43 38 504 C2 gezeigt, haben den Nachteil, dass die Förderleistung der Saugstrahlpumpe bei bestimmten Betriebsbedingungen nicht ausreicht, eine in einem Speicherbehälter angeordnete Förderpumpe mit genügend Kraftstoff zu versorgen.Devices for conveying fuel with a single suction jet pump, such as For example, in DE 43 38 504 C2, have the disadvantage that the Delivery rate of the suction jet pump is not sufficient under certain operating conditions, a arranged in a storage tank pump with enough fuel to supply.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Vorrichtung zum Fördern von Kraftstoff mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß auf einfache Art und Weise eine Verbesserung dahingehend erzielt wird, dass die Herstellungskosten verringert werden, indem die Treibdüsen von einem einzigen sich in Strömungsrichtung konisch verengenden, stromauf der Mischkanäle angeordneten Fangkanal umgeben sind. The inventive device for conveying fuel with the characterizing Features of the main claim has the advantage that in a simple way and An improvement is achieved in that the production costs be reduced by moving the motive nozzles of a single one in the flow direction conically narrowing, upstream of the mixing channels arranged collecting channel are surrounded.

Auf diese Weise sind die Saugstrahlpumpen kompakter gebaut und mit weniger Spritzgußmasse herstellbar.In this way, the suction jet pumps are made more compact and with less Injection molding produced.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Vorrichtung möglich.The measures listed in the dependent claims are advantageous Further developments and improvements of the main claim device possible.

Besonders vorteilhaft ist, wenn zwischen den Treibdüsen und dem Fangkanal ein ringförmiger Spalt vorgesehen ist, der stromauf mit einem Ansaugkanal strömungsverbunden ist. Auf diese Weise strömt der angesaugte Kraftstoff nahezu parallel zu den Treibstrahlen in den Fangkanal ein, so dass eine Ablenkung der Treibstrahlen quer zur Strömungsrichtung vermieden wird.It is particularly advantageous if between the drive nozzles and the capture channel annular gap is provided, the upstream with an intake passage fluidly connected. In this way, the sucked fuel flows almost parallel to the propulsion jets in the capture channel, so that a deflection of the Blowing jets is avoided transversely to the flow direction.

Auch vorteilhaft ist, wenn der Fangkanal eine Ansaugkammer begrenzt und den Kraftstoff aus der Ansaugkammer in die Mischkanäle leitet, da die Treibstrahlen in der Ansaugkammer einen Unterdruck erzeugen und auf diese Weise Kraftstoff über den Ansaugkanal in die Ansaugkammer ansaugen. Der angesaugte Kraftstoff wird von den Treibstrahlen in die Mischkanäle mitgerissen.It is also advantageous if the catching channel limits a suction chamber and the Fuel from the suction chamber leads into the mixing channels, since the propulsion jets in the Vacuum generating a vacuum and in this way fuel over the Aspirate suction channel into the suction chamber. The sucked fuel is from the Driving jets entrained in the mixing channels.

Außerdem vorteilhaft ist, wenn die Treibdüsen einteilig miteinander verbunden sind, da auf diese Weise die Herstellung der Saugstrahlpumpen besonders günstig ist.It is also advantageous if the motive nozzles are integrally connected with each other, there in this way the production of the suction jet pumps is particularly favorable.

Weiterhin vorteilhaft ist, wenn auch die Mischkanäle einteilig miteinander verbunden sind, da auf diese Weise die Herstellungskosten der Saugstrahlpumpen deutlich verringert sind.It is also advantageous if the mixing channels are connected to one another in one piece are, as in this way significantly reduces the manufacturing cost of the suction jet pumps are.

Desweiteren vorteilhaft ist, wenn die Mischkanäle mittels einer Trennwand voneinander getrennt sind, da dies zur Aufrechterhaltung einer hohen Förderleistung der Saugstrahlpumpen notwendig ist.Furthermore, it is advantageous if the mixing channels by means of a partition from each other are separated, as this is necessary to maintain a high flow rate Suction jet pumps is necessary.

Darüber hinaus vorteilhaft ist, wenn die Mischkanäle stromab in einen gemeinsamen Diffusor münden, da auf diese Weise Druckenergie zurückgewonnen wird und Strömungsgeräusche verringert werden. Moreover, it is advantageous if the mixing channels downstream in a common Diffuser lead, since in this way pressure energy is recovered and Flow noise can be reduced.

Sehr vorteilhaft ist es, wenn der Querschnitt des Diffusors 8-förmig ausgebildet ist, da die Saugstrahlpumpen auf diese Weise sehr nah beieinander angeordnet werden können und dadurch besonders wenig Bauraum benötigen. Außerdem wird auf diese Weise nur wenig Spritzgussmasse benötigt, so dass die Herstellungskosten verringert werden.It is very advantageous if the cross section of the diffuser is 8-shaped, since the Suction jet pumps can be arranged in this way very close to each other and thus require very little space. Besides, this will do little Injection molding material needed, so that the production costs are reduced.

In einem besonders vorteilhaften Ausführungsbeispiel ist jeder Treibdüse einer der Mischkanäle zugeordnet und die Treibdüsen sind bezüglich des zugeordneten Mischkanals konzentrisch angeordnet.In a particularly advantageous embodiment, each motive nozzle is one of Associated mixing channels and the driving nozzles are with respect to the associated Mixing channel arranged concentrically.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Fig.1 im Schnitt eine Ansicht einer Vorrichtung zum Fördern von Kraftstoff mit zwei erfindungsgemäßen Saugstrahlpumpen und Fig.2 die zwei erfindungsgemäßen Saugstrahlpumpen nach Fig.1 in einer Draufsicht.An embodiment of the invention is shown in simplified form in the drawing and in the following description. 1 shows a sectional view a device for conveying fuel with two inventive Suction jet pumps and Fig.2 the two Saugstrahlpumpen invention according to Fig.1 in a top view.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Fig. 1 zeigt im Schnitt eine Vorrichtung zum Fördern von Kraftstoff mit zwei erfindungsgemäßen Saugstrahlpumpen.Fig. 1 shows in section a device for conveying fuel with two Suction jet pumps according to the invention.

Die erfindungsgemäße Vorrichtung weist mehere Saugstrahlpumpen 1 mit jeweils einer Treibdüse 2 und einem Mischkanal 3 auf. Die Saugstrahlpumpen 1 sind beispielsweise in einem gemeinsamen Gehäuse 1.1 vorgesehen, das beispielsweise aus Kunststoff und mittels Spritzgußtechnik hergestellt ist. Beispielsweise sind zwei Saugstrahlpumpen 1 an dem Gehäuse 1.1 ausgebildet. Es können aber ausdrücklich auch mehr als zwei Saugstrahlpumpen 1 in dem Gehäuse 1.1 integriert sein.The device according to the invention has several suction jet pumps 1 each with one Treibdüse 2 and a mixing channel 3. The suction jet pumps 1 are for example in a common housing 1.1 provided, for example, made of plastic and made by injection molding. For example, two suction jet pumps 1 on formed the housing 1.1. But it can also express more than two Suction jet pumps 1 be integrated in the housing 1.1.

Die Treibdüsen 2 sind beispielsweise als eine düsenartige Verengung ausgeführt. Die Treibdüsen 2 sind stromauf mit einer Treibleitung 4 und stromab mit einer gemeinsamen Ansaugkammer 6 verbunden. Über die Treibleitung 4 wird jeder Treibdüse 2 Kraftstoff zugeführt, der über jeweils eine Düsenöffnung 5 als Treibstrahl in die Ansaugkammer 6 gelangt. Stromab der Ansaugkammer 6 sind die Mischkanäle 3 angeordnet.The motive nozzles 2 are designed, for example, as a nozzle-like constriction. The Propulsion nozzles 2 are upstream with a drive line 4 and downstream with a common Suction chamber 6 connected. Via the haulage line 4, each motive nozzle 2 becomes fuel supplied, which in each case via a nozzle opening 5 as a propulsion jet into the suction chamber. 6 arrives. Downstream of the suction chamber 6, the mixing channels 3 are arranged.

Das Gehäuse 1.1 mit den Saugstrahlpumpen 1 ist beispielsweise in einem Speicherbehälter 8 angeordnet. Die Saugstrahlpumpen 1 fördern Kraftstoff aus einem Vorratsbehälter 9 in den Speicherbehälter 8. Der Speicherbehälter 8 ist innerhalb des Vorratsbehälters 9 beispielsweise nahe einem Tankboden 10 des Vorratsbehälters 9 angeordnet.The housing 1.1 with the suction jet pumps 1 is for example in one Storage tank 8 is arranged. The Saugstrahlpumpen 1 promote fuel from a Reservoir 9 in the storage container 8. The storage container 8 is within the Reservoir 9, for example, near a tank bottom 10 of the reservoir. 9 arranged.

Die Mischkanäle 3 verlaufen beispielsweise in Richtung des Tankbodens 10, was auch als liegende Anordnung der Saugstrahlpumpen 1 bezeichnet wird. Eine bezüglich des Tankbodens 10 senkrechte oder auch als stehend bezeichnete Anordnung der Mischkanäle 3 ist jedoch ebenso möglich.The mixing channels 3 extend, for example, in the direction of the tank bottom 10, which also is referred to as a horizontal arrangement of the suction jet pumps 1. A respect to the Tank bottom 10 vertical or referred to as standing arrangement of However, mixing channels 3 is also possible.

Die Treibleitung 4 ist beispielsweise über ein Druckregelventil 11 mit einer Druckleitung 12 strömungsverbunden, die von einem Förderaggregat 15 ausgehend zu einer Brennkraftmaschine 16 verläuft und diese mit Kraftstoff versorgt. Das Förderaggregat 15 ist beispielsweise in dem Speicherbehälter 8 angeordnet und saugt Kraftstoff über eine Ansaugleitung 17, in der beispielsweise ein Vorfilter 18 vorgesehen ist, an und fördert diesen druckerhöht über die Druckleitung 12 zur Brennkraftmaschine 16. In der Druckleitung 12 ist beispielsweise ein Hauptfilter 19 vorgesehen, der im Kraftstoff enthaltene feine Schmutzpartikel herausfiltert. Von der Druckleitung 12, beispielsweise stromab des Hauptfilters 19, zweigt die Treibleitung 4 ab und versorgt die Saugstrahlpumpen 1 bei geöffnetem Druckregelventil 11 mit Kraftstoff. Das Druckregelventil 11 öffnet, wenn der Druck in der Druckleitung 12 einen vorbestimmten Wert überschreitet und läßt überschüssigen Kraftstoff aus der Druckleitung 12 über die Treibleitung 4 und die Treibdüsen 2 in die Ansaugkammer 6 und über die Mischkanäle 3 der Saugstrahlpumpen 1 zurück in den Speicherbehälter 8 strömen. Die Saugstrahlpumpen 1 können aber ausdrücklich auch über eine Rücklaufleitung gespeist werden, die überschüssigen Kraftstoff von der Brennkraftmaschine 16 zurück in den Vorratsbehälter 8 fördert. Ebenso kann die Saugstrahlpumpe 1 direkt mit der Druckleitung 12 sowohl stromauf als auch stromab des Hauptfilters 19 strömungsverbunden sein, wobei der Druck der Druckleitung 12 beispielsweise durch eine Drossel abgesenkt wird. The treble line 4 is for example via a pressure control valve 11 with a pressure line 12 fluidly connected, starting from a delivery unit 15 to a Internal combustion engine 16 runs and supplies them with fuel. The delivery unit 15 is arranged, for example, in the storage container 8 and sucks fuel through a Suction line 17, in which, for example, a pre-filter 18 is provided, and promotes this pressure increases via the pressure line 12 to the engine 16. In the Pressure line 12, for example, a main filter 19 is provided in the fuel contained fine dirt particles filters out. From the pressure line 12, for example downstream of the main filter 19, the tether 4 branches off and supplies the Suction jet pumps 1 with open pressure control valve 11 with fuel. The Pressure control valve 11 opens when the pressure in the pressure line 12 a predetermined Value exceeds and allows excess fuel from the pressure line 12 over the Trebleitung 4 and the driving nozzles 2 in the suction chamber 6 and the mixing channels. 3 the suction jet pumps 1 flow back into the storage container 8. The Suction jet pumps 1 but can expressly fed via a return line Be the excess fuel from the engine 16 back in the Reservoir 8 promotes. Likewise, the suction jet pump 1 directly with the Pressure line 12 both upstream and downstream of the main filter 19th be flow-connected, wherein the pressure of the pressure line 12, for example by a throttle is lowered.

Die Saugstrahlpumpen 1 saugen auf bekannte Art und Weise Kraftstoff aus dem Vorratsbehälter 9 an, wobei der Kraftstoff über einen Ansaugkanal 22 in die Ansaugkammer 6 der Saugstrahlpumpen 1 gelangt. Der Ansaugkanal 22 ist beispielsweise durch einen Zwischenraum zwischen einem Hohlzylinder 21 des Gehäuses 1.1 und den in dem Hohlzylinder 21 angeordneten, zu den Treibdüsen 2 verzweigten Abschnitten der Treibleitung 4 gebildet. Der in dem Ansaugkanal 22 in Richtung der Ansaugkammer 6 strömende Kraftstoff umströmt die Abschnitte der Treibleitung 4, die sich zu den Treibdüsen 2 hin verzweigen, und die Treibdüsen 2 selbst und tritt durch einen ringförmigen Spalt 29 zwischen einer Wandung des Gehäuses 1.1 und den Treibdüsen 2 nahezu parallel zu den Treibstrahlen in die Ansaugkammer 6 ein, so daß die die Treibstrahlen in radialer Richtung ablenkenden Strömungskräfte gering sind. Auf diese Weise wird vermieden, dass sich die Treibstrahlen der Treibdüsen 2 in radialer Richtung an eine Wandung der Mischkanäle 3 anlegen und sich die Förderleistung der Saugstrahlpumpen verringert.The suction jet pumps 1 suck in a known manner fuel from the Reservoir 9, wherein the fuel via an intake passage 22 in the Suction chamber 6 of the suction jet pumps 1 passes. The intake passage 22 is for example, by a gap between a hollow cylinder 21 of the housing 1.1 and arranged in the hollow cylinder 21, branched to the driving nozzles 2 Sections of the Trebleitung 4 formed. The in the intake passage 22 in the direction of Suction chamber 6 flowing fuel flows around the portions of the haulage line 4, the branching out to the motive nozzles 2, and the motive nozzles 2 themselves and passing through an annular gap 29 between a wall of the housing 1.1 and the Treibdüsen 2 almost parallel to the propulsion jets in the suction chamber 6, so that the the propulsion jets in the radial direction deflecting flow forces are low. On This way it is avoided that the driving jets of the driving nozzles 2 in radial Create direction to a wall of the mixing channels 3 and the flow rate of the Suction jet pumps reduced.

Der Kraftstoff der Treibleitung 4 gelangt über die Düsenöffnungen 5 der Treibdüsen 2 als sogenannter Treibstrahl in die Ansaugkammer 6, wobei die Treibstrahlen von den Treibdüsen 2 ausgehend die Ansaugkammer 6 durchtreten und jeweils bis in einen der sich an die Ansaugkammer 6 anschließenden Mischkanäle 3 reichen. Jeder Treibstrahl einer der Treibdüsen 2 reißt Kraftstoff aus der Ansaugkammer 6 in den der Treibdüse 2 zugeordneten Mischkanal 3 mit, so daß in der Ansaugkammer 6 ein Unterdruck entsteht, der Kraftstoff aus dem Vorratsbehälter 9 über den Ansaugkanal 22 in die Ansaugkammer 6 nachströmen läßt. Der Kraftstoff der Treibstrahlen und der mitgerissene Kraftstoff der Ansaugkammer 6 und/oder der Mischkanäle 3 strömt über die Mischkanäle 3 und jeweils eine Ausgangsöffnung 23 des Mischkanals 3 beispielsweise in einen gemeinsamen Diffusor 25, der über einen Diffusorausgang 26 in den Speicherbehälter 8 mündet. Der Diffusor 25 erweitert sich bekannterweise in Strömungsrichtung, so dass die Strömungsgeschwindigkeit des Kraftstoffs und die Strömungsgeräusche verringert werden. Die Mischkanäle 3 können aber selbstverständlich auch direkt in den Speicherbehälter 8 führen.The fuel of the haulage line 4 passes through the nozzle openings 5 of the driving nozzles 2 as so-called propulsion jet into the suction chamber 6, wherein the propulsion jets of the Treibdüsen 2 starting from the suction chamber 6 and each pass to one of extend to the suction chamber 6 subsequent mixing channels 3. Every jet one of the drive nozzles 2 ruptures fuel from the suction chamber 6 into the drive nozzle 2 associated mixing channel 3, so that in the suction chamber 6, a negative pressure, the fuel from the reservoir 9 via the intake passage 22 into the suction chamber 6 can flow. The fuel of the propulsion jets and the entrained fuel the Suction chamber 6 and / or the mixing channels 3 flows through the mixing channels 3 and respectively an outlet opening 23 of the mixing channel 3, for example, in a common Diffuser 25, which opens via a diffuser outlet 26 into the storage container 8. Of the As is known, diffuser 25 widens in the flow direction, so that the Flow rate of the fuel and the flow noise is reduced become. Of course, the mixing channels 3 can also directly into the Lead storage container 8.

Die Mischkanäle 3 sind nebeneinander angeordnet und weisen jeweils eine Kanalachse 30 auf. Die Kanalachsen 30 der Mischkanäle 3 verlaufen jeweils in die gleiche Richtung und sind beispielsweise parallel zueinander angeordnet. Jedem Mischkanal 3 ist eine Treibdüse 2 zugeordnet. Die Mischkanäle 3 und die Treibdüsen 2 sind beispielsweise konzentrisch zueinander angeordnet, so dass der aus der Treibdüse 2 austretende Treibstrahl jeweils in den zugeordneten Mischkanal 3 gelangt und idealerweise mit der Kanalachse 30 des zugeordneten Mischkanals 3 fluchtet.The mixing channels 3 are arranged side by side and each have a channel axis 30 on. The channel axes 30 of the mixing channels 3 each extend in the same direction and are arranged, for example, parallel to each other. Each mixing channel 3 is a Hatching nozzle 2 assigned. The mixing channels 3 and the driving nozzles 2 are for example arranged concentrically with each other so that the emerging from the motive nozzle 2 Drive jet each passes into the associated mixing channel 3 and ideally with the Channel axis 30 of the associated mixing channel 3 is aligned.

Erfindungsgemäß sind die Treibdüsen 2 von einem einzigen sich in Strömungsrichtung konisch verengenden, stromauf der Mischkanäle 3 angeordneten Fangkanal 31 umgeben. Der Fangkanal 31 ist beispielsweise durch einen Hohlkegel 33 gebildet, der sich an den Hohlzylinder 21 des Gehäuses 1.1 in Strömungsrichtung anschließt. Der Fangkanal 31 begrenzt die Ansaugkammer 6 in radialer Richtung quer zur Strömungsrichtung und leitet den Kraftstoff der Treibstrahlen und den mitgerissenen Kraftstoff aus der Ansaugkammer 6 in die Mischkanäle 3.According to the invention, the driving nozzles 2 are of a single in the flow direction conically narrowing, upstream of the mixing channels 3 arranged collecting channel 31 surrounded. The collecting channel 31 is formed, for example, by a hollow cone 33 which adjoins the Hollow cylinder 21 of the housing 1.1 connects in the flow direction. The catch channel 31 limits the suction chamber 6 in the radial direction transversely to the flow direction and conducts the fuel of the propulsion jets and the entrained fuel from the suction chamber 6 in the mixing channels. 3

Die zu jeder Saugstrahlpumpe 1 gehörende Treibdüse 2 ist über den Fangkanal 31 mit dem zugeordneten Mischkanal 3 mechanisch verbunden, beispielsweise durch nicht dargestellte Stege. Beispielsweise sind die Treibdüsen 2 und/oder der Fangkanal 31 und/oder die Mischkanäle 3 einstückig miteinander verbunden, sind also nur aus einem Stück hergestellt.The belonging to each ejector pump 1 motive nozzle 2 is about the fishing channel 31 with the associated mixing channel 3 mechanically connected, for example by not illustrated bridges. For example, the driving nozzles 2 and / or the collecting channel 31 and / or the mixing channels 3 integrally connected to each other, so are only one Piece made.

Die Treibdüsen 2 sind in dem Fangkanal 31 angeordnet. Sie sind beispielsweise einteilig miteinander verbunden und in einem gemeinsamen Düsengehäuse 1.2 vorgesehen. Das Düsengehäuse 1.2 ist beispielsweise Teil des Gehäuses 1.1.The driving nozzles 2 are arranged in the catching channel 31. For example, they are one-piece connected to each other and provided in a common nozzle housing 1.2. The Nozzle housing 1.2, for example, part of the housing 1.1.

Auch die Mischkanäle 3 sind beispielsweise einteilig miteinander verbunden und an dem Gehäuse 1.1 ausgebildet. Dadurch lassen sich die Saugstrahlpumpen 1 besonders einfach und kostengünstig herstellen.The mixing channels 3 are, for example, integrally connected to each other and on the Housing 1.1 formed. As a result, the suction jet pumps 1 can be particularly simple and produce inexpensively.

Die Mischkanäle 3 weisen beispielsweise jeweils einen kreisförmigen Strömungsquerschnitt auf und sind beispielsweise mittels einer Trennwand 32 voneinander getrennt. Durch die Trennung der Mischkanäle 3 wird erreicht, dass sich die Treibstrahlen nicht gegenseitig beeinflussen können. Die Trennwand 32 verläuft beispielsweise von dem der Ansaugkammer 6 zugewandten Ende in Richtung der Kanalachsen 30 bis zu dem dem Diffusor 25 zugewandten Ende der Mischkanäle 3 und kann beidseitig sowohl in die Ansaugkammer 6 als auch in den Diffusor 25 hineinragen. Da die Trennwand 32 im Bereich der Ausgangsöffnungen 23 der Mischkanäle endet, münden die Mischkanäle 3 in einen einzigen den Diffusor 25 bildenden Kanal. Die Trennwand 32 ist als eine gemeinsame Mischkanalwandung für jeweils zwei benachbarte Mischkanäle 3 ausgebildet und beispielsweise gewölbt ausgeführt.The mixing channels 3, for example, each have a circular Flow cross section and are for example by means of a partition wall 32nd separated from each other. By separating the mixing channels 3 is achieved that the Driving jets can not influence each other. The partition wall 32 extends For example, from the suction chamber 6 facing the end in the direction of Channel axes 30 up to the diffuser 25 facing the end of the mixing channels 3 and can protrude both sides both in the suction chamber 6 and in the diffuser 25. Since the dividing wall 32 ends in the region of the outlet openings 23 of the mixing channels, the mixing channels 3 open into a single channel forming the diffuser 25. The Partition 32 is as a common mixing channel wall for every two adjacent Mischkanäle 3 formed and executed, for example curved.

Bei beispielsweise zwei an dem Gehäuse 1.1 ausgebildeten Saugstrahlpumpen 1 ist beispielsweise ein 8-förmiger Querschnitt des Diffusors 25 vorgesehen (Fig.2). Auf diese Weise sind die Mischkanäle 3 sehr nah beieinander und Bauraum sparend angeordnet.For example, in the case of two suction jet pumps 1 formed on the housing 1.1 For example, an 8-shaped cross-section of the diffuser 25 is provided (Figure 2). To this Way, the mixing channels 3 are very close to each other and space-saving arrangement.

Der Ansaugkanal 22 ist beispielsweise zylinderförmig, der Fangkanal 31 konisch, die Mischkanäle 3 zylinderförmig und der gemeinsame Diffusor 25 konisch ausgeführt.The intake passage 22 is cylindrical, for example, the collecting channel 31 conical, the Mixture channels 3 cylindrical and the common diffuser 25 conical.

Bei der Vorrichtung nach Fig.2 sind die gegenüber der Vorrichtung nach Fig.1 gleichbleibenden oder gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet.
Fig.2 zeigt die erfindungsgemäßen Saugstrahlpumpen nach Fig.1 in einer Draufsicht.2, the parts which are the same or have the same effect as the device according to FIG. 1 are identified by the same reference numerals.
2 shows the suction jet pump according to the invention according to Figure 1 in a plan view.

Claims (9)

Vorrichtung zum Fördern von Kraftstoff, mit zumindest zwei Saugstrahlpumpen, die jeweils eine Treibdüse und einen stromab der Treibdüse angeordneten Fangkanal und Mischkanal aufweisen, dadurch gekennzeichnet, dass die Treibdüsen (2) von einem einzigen sich in Strömungsrichtung konisch verengenden, stromauf der Mischkanäle (3) angeordneten Fangkanal (31) umgeben sind.Device for conveying fuel, with at least two suction jet pumps, each having a motive nozzle and a collecting channel and mixing channel arranged downstream of the motive nozzle, characterized in that the motive nozzles (2) extend from a single conically narrowing in the direction of flow upstream of the mixing channels (3). arranged catching channel (31) are surrounded. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass zwischen den Treibdüsen (2) und dem Fangkanal (31) ein ringförmiger Spalt (29) vorgesehen ist, der stromauf mit einem Ansaugkanal (22) strömungsverbunden ist.Apparatus according to claim 1, characterized in that between the driving nozzles (2) and the collecting channel (31), an annular gap (29) is provided, which is flow-connected upstream with an intake passage (22). Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Fangkanal (31) eine Ansaugkammer (6) begrenzt und den Kraftstoff aus der Ansaugkammer (6) in die Mischkanäle (3) leitet.Apparatus according to claim 2, characterized in that the catching channel (31) delimits a suction chamber (6) and directs the fuel from the suction chamber (6) into the mixing channels (3). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Treibdüsen (2) einteilig miteinander verbunden sind.Apparatus according to claim 1, characterized in that the driving nozzles (2) are integrally connected to each other. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Mischkanäle (3) einteilig miteinander verbunden sind.Apparatus according to claim 1, characterized in that the mixing channels (3) are integrally connected to each other. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Mischkanäle (3) mittels einer Trennwand (32) voneinander getrennt sind. Apparatus according to claim 1, characterized in that the mixing channels (3) by means of a partition wall (32) are separated from each other. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Mischkanäle (3) stromab in einen gemeinsamen Diffusor (25) münden.Apparatus according to claim 1, characterized in that the mixing channels (3) open downstream in a common diffuser (25). Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass der Querschnitt des Diffusors (25) 8-förmig ausgebildet ist.Apparatus according to claim 7, characterized in that the cross section of the diffuser (25) is 8-shaped. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass jeder Treibdüse (2) einer der Mischkanäle (3) zugeordnet ist und die Treibdüsen (2) bezüglich des zugeordneten Mischkanals (3) konzentrisch angeordnet sind.Apparatus according to claim 1, characterized in that each drive nozzle (2) is associated with one of the mixing channels (3) and the driving nozzles (2) are arranged concentrically with respect to the associated mixing channel (3).
EP20050104940 2004-06-18 2005-06-07 Device for pumping fuel Expired - Fee Related EP1607635B1 (en)

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US7080632B2 (en) 2006-07-25
DE102004047782A1 (en) 2006-01-05
US20050279414A1 (en) 2005-12-22

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