EP0918937A1 - Fuel supply unit - Google Patents

Fuel supply unit

Info

Publication number
EP0918937A1
EP0918937A1 EP98912245A EP98912245A EP0918937A1 EP 0918937 A1 EP0918937 A1 EP 0918937A1 EP 98912245 A EP98912245 A EP 98912245A EP 98912245 A EP98912245 A EP 98912245A EP 0918937 A1 EP0918937 A1 EP 0918937A1
Authority
EP
European Patent Office
Prior art keywords
impeller
pump
pump chamber
unit according
side channel
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.)
Withdrawn
Application number
EP98912245A
Other languages
German (de)
French (fr)
Inventor
Klaus Dobler
Michael Huebel
Willi Strohl
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 EP0918937A1 publication Critical patent/EP0918937A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/048—Arrangements for driving regenerative pumps, i.e. side-channel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0646—Units comprising pumps and their driving means the pump being electrically driven the hollow pump or motor shaft being the conduit for the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps

Definitions

  • the invention relates to a fuel delivery unit of the type defined in the preamble of claim 1.
  • the delivery pump and the electric motor for driving it are arranged side by side in a housing.
  • the pump or impeller which is equipped with vanes or impeller blades on its circumference, sits in a rotationally fixed manner on the shaft of the rotor or rotor, which carries a rotor or armature winding lying in slots and rotates in a stator or stator covered with permanent magnet segments.
  • the current is supplied to the armature winding via a commutator or commutator located on the rotor shaft and two current brushes which rest radially on the commutator under spring pressure.
  • the fuel delivery unit according to the invention with the characterizing features of claim 1 has the advantage that by combining the rotating parts of the delivery unit, i.e. the impeller of the feed pump and the rotor of the electric motor, a very simple and compact structure is achieved in a single part, which can be produced with little manufacturing effort.
  • the conveyor unit can be made very flat, that is to say with an extremely small axial dimension.
  • the increasing outside diameter of the conveyor unit in connection with the usual design of the conveyor unit is not only not a disadvantage, but also opens up the possibility for additional measures to improve the efficiency of the conveyor unit.
  • Dispensing with the commutator and current brushes means that brush wear is eliminated, so that the service life of the conveyor unit is increased.
  • the electric motor is designed as a DC motor, the necessary commutation of the current in the stator winding is carried out electronically.
  • the cylindrical pump chamber is composed of two radially extending, axially spaced side walls and one of the two side walls along the circular side wall
  • the impeller is opposite the side walls with a gap distance, and the inner surface of the stator formed by a grooved laminated core forms the peripheral wall of the pump chamber.
  • the impeller has a variety of in
  • Open blade chambers delimit radial impeller blades which are connected to one another by an outer ring.
  • the permanent magnets are attached to the outer ring and are preferably made of plastoferrites when the conveying unit is made of plastic.
  • a groove-like side channel open to the pump chamber is formed concentrically to the impeller axis with an interrupter web remaining between the side channel end and the side channel beginning, based on the direction of flow.
  • the side channel start of at least one side channel is connected to a suction opening and the side channel end is connected to a pressure outlet, the axes of the inlet and outlet channels from the suction opening and to the pressure outlet being either axially or preferably radially aligned.
  • the radial inflow and outflow is easily possible due to the enlarged outer diameter of the delivery unit due to the construction according to the invention, since this provides sufficient installation space in the radial direction for accommodating corresponding inflow and outflow channels.
  • Fig. 1 shows a longitudinal or meridional section of the
  • Conveying unit the section being made in the upper half of the illustration through the flow area formed and in the lower half of the illustration through the suction area of the conveying unit,
  • Fig. 2 shows a portion of the same representation as in Fig. 1 of a modified conveyor unit.
  • the delivery unit shown schematically in FIG. 1 serves to deliver fuel from a reservoir to the internal combustion engine of a motor vehicle.
  • the delivery unit is usually arranged in connection with a filter bowl as a so-called tank installation unit in the fuel tank or fuel tank of the motor vehicle.
  • the delivery unit has a delivery pump 11 designed as a flow or side channel pump and an electric motor 12 driving the delivery pump 11.
  • Feed pump 11 and electric motor 12 are accommodated in a common housing 13.
  • the structure and operation of the feed pump 11 is known and described for example in DE 40 20 521 AI.
  • a pump chamber 14 is formed in the housing 13 and is delimited in the axial direction by two radially extending, axially spaced apart side walls 141, 142 and in the circumferential direction by a peripheral wall 143 connecting the two side walls 141, 142 along their circular periphery.
  • a pump or impeller 16 is arranged in the pump chamber 14 and sits on a shaft 17 in a rotationally fixed manner.
  • the shaft 17 is received with two shaft ends in two bearings 18, 19 which are formed in the two side walls 141, 142.
  • the axis of the shaft 17 is colinear with the impeller axis 161 and
  • the impeller 16 has a large number of radial impeller blades 20 spaced apart from one another in the circumferential direction, of which only two can be seen in the drawing.
  • the impeller blades 20 are connected to one another by an outer ring 21. Two impeller blades 20 each delimit one between them
  • Vane chamber 22 which is axially open.
  • the impeller 16 lies opposite the side walls 141, 142 at a gap distance, and the outer ring 21 encloses a radial gap with the peripheral wall 143 of the pump chamber 14.
  • a groove-like side channel 23 or 24, which is open towards the pump chamber 14 is formed, which is arranged concentrically to the impeller axis 161 and extends in the circumferential direction almost over 330 ° from a side channel start to a side channel end, between the side channel end and a break bar remains at the beginning of the side channel.
  • only the side channel beginning 231 and 241 of the side channels 23, 24 can be seen in the lower sectional view.
  • each side channel 23, 24 is connected via a radially oriented inflow channel 25 or 26 to an intake opening 27 of the delivery unit.
  • the side channel ends of the two side channels 23, 24, which cannot be seen here, are each connected via a discharge channel to a pressure port of the delivery unit.
  • only the side channel beginning 231 of the side channel 23 is connected to an inflow channel 25 and only the side channel end of the side channel 24 is connected to an outflow channel.
  • the inflow channel 26 is omitted on the right in the sectional view, and the side channel 24 shows a cross section in this area, as is indicated by the broken lines in the drawing.
  • the inflow channels 25, 26 can be arranged axially, but the radial alignment has the advantage of lower flow losses and is easy to implement because of the relatively large outside diameter of the delivery unit.
  • Permanent magnet segments 30 formed, which are attached to the outer ring 21 of the impeller 16.
  • the stator 28 is arranged as a grooved laminated core 31 coaxially to the impeller axis 161 in the housing 13 so that the inner ring surface of the laminated core 31 forms the peripheral wall 143 of the pump chamber 14.
  • An armature winding 32 is usually arranged in the grooves of the laminated core 31, of which only the two winding heads 321 and 322 and the two connecting lines 323 and 324 can be seen in the schematic drawing. In the case of a direct current drive, the electric motor 12 is commutated electronically.
  • the impeller 16 of the feed pump 11 is made of plastic, there is a manufacturing advantage if the permanent magnet segments 30 are made of plastic ferrites.
  • the further exemplary embodiment of the conveying unit shown in section in FIG. 2 is only modified with regard to the mounting of the impeller 16 in the housing 13 and otherwise corresponds to the exemplary embodiment described above, so that the same components are identified with the same reference numerals.
  • the side walls 141 and 142 of the pump chamber 14 are formed here on the one hand by a cover 131 which closes the end face of the housing 13 and by a radial flange 132 arranged in the housing 13.
  • a stub shaft 33 protruding at right angles into the pump chamber 14 is formed in one piece, on which the impeller 16 is freely rotating. After inserting the impeller 16 the cover 131 is placed tightly on the housing 13 and firmly connected to it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a fuel supply unit with a supply pump (11) designed as a flow or side-channel pump, comprising a pump chamber (14) inside a housing (13), an impeller (16) located therein and an electric motor (12) driving the impeller (16). In order to provide an extremely flat design in the axial direction of the electric motor (13), the inventive device is devoid of brushes and the rotor is formed by the impeller (16) of the supply pump (11).

Description

Förderaggregat für KraftstoffFuel delivery unit
Stand der TechnikState of the art
Die Erfindung betrifft ein Förderaggregat für Kraftstoff der im Oberbegriff des Anspruchs 1 definierten Gattung.The invention relates to a fuel delivery unit of the type defined in the preamble of claim 1.
Bei einem bekannten Förderaggregat dieser Art zum Fördern von Kraftstoff aus einem Kraftstoffbehälter zu einer Brennkraftmaschine eines Kraftfahrzeugs (WO 95/25885) sind die Förderpumpe und der Elektromotor zu deren Antrieb in einem Gehäuse nebeneinander angeordnet. Das Pumpen- oder Laufrad, das an seinem Umfang mit Flügeln oder Laufradschaufeln besetzt ist, sitzt drehfest auf der Welle des Rotors oder Läufers, der eine in Nuten einliegende Rotor- oder Ankerwicklung trägt und in einem mit Permanentmagnetsegmenten belegten Ständer oder Stator umläuft . Die Stromzuführung zur Ankerwicklung erfolgt über einen auf der Rotorwelle sitzenden Kommutator oder Stromwender und zwei auf den Kommutator unter Federdruck radial aufliegenden Strombürsten. Vorteile der ErfindungIn a known delivery unit of this type for delivering fuel from a fuel tank to an internal combustion engine of a motor vehicle (WO 95/25885), the delivery pump and the electric motor for driving it are arranged side by side in a housing. The pump or impeller, which is equipped with vanes or impeller blades on its circumference, sits in a rotationally fixed manner on the shaft of the rotor or rotor, which carries a rotor or armature winding lying in slots and rotates in a stator or stator covered with permanent magnet segments. The current is supplied to the armature winding via a commutator or commutator located on the rotor shaft and two current brushes which rest radially on the commutator under spring pressure. Advantages of the invention
Das erfindungsgemäße Förderaggregat für Kraftstoff mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, daß durch Zusammenfassung der drehenden Teile des Förderaggregats, also des Laufrads der Förderpumpe und des Rotors des Elektromotors, zu einem einzigen Teil ein sehr einfacher und kompakter Aufbau erzielt wird, der mit geringem Fertigungsaufwand darstellbar ist. Insbesondere kann das Förderaggregat sehr flach, also mit extrem geringer axialer Abmessung, ausgeführt werden. Der dabei sich vergrößernde Außendurchmesser des Förderaggregats stellt im Zusammenhang mit der üblichen Ausbildung des Förderaggregats nicht nur keinen Nachteil dar, sondern eröffnet die Möglichkeit für zusätzliche Maßnahmen zur Verbesserung des Wirkungsgrads des Förderaggregats. Durch den Verzicht auf Kommutator und Strombürsten entfällt der Bürstenverschleiß, so daß sich die Lebensdauer des Förderaggregats erhöht. Bei der Ausbildung des Elektromotors als Gleichstrommotor wird die notwendige Kommutierung des Stroms in der Statorwicklung elektronisch vorgenommen .The fuel delivery unit according to the invention with the characterizing features of claim 1 has the advantage that by combining the rotating parts of the delivery unit, i.e. the impeller of the feed pump and the rotor of the electric motor, a very simple and compact structure is achieved in a single part, which can be produced with little manufacturing effort. In particular, the conveyor unit can be made very flat, that is to say with an extremely small axial dimension. The increasing outside diameter of the conveyor unit in connection with the usual design of the conveyor unit is not only not a disadvantage, but also opens up the possibility for additional measures to improve the efficiency of the conveyor unit. Dispensing with the commutator and current brushes means that brush wear is eliminated, so that the service life of the conveyor unit is increased. When the electric motor is designed as a DC motor, the necessary commutation of the current in the stator winding is carried out electronically.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Förderaggregats möglich.Advantageous further developments and improvements of the delivery unit specified in claim 1 are possible through the measures listed in the further claims.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist die zylinderförmige Pumpenkammer von zwei sich radial erstreckenden, voneinander axial beabstandeten Seitenwänden und einer die beiden Seitenwände längs deren kreisförmigenAccording to a preferred embodiment of the invention, the cylindrical pump chamber is composed of two radially extending, axially spaced side walls and one of the two side walls along the circular side wall
Peripherie miteinander verbindenden Peripherwand begrenzt . Das Laufrad liegt jeweils mit Spaltabstand den Seitenwänden gegenüber, und die Innenfläche des von einem genuteten Blechpaket gebildeten Stators bildet die Peripherwand der Pumpenkammer. Das Laufrad weist eine Vielzahl von inPeriphery interconnecting peripheral wall limited. The impeller is opposite the side walls with a gap distance, and the inner surface of the stator formed by a grooved laminated core forms the peripheral wall of the pump chamber. The impeller has a variety of in
Umfangsrichtung voneinander beabstandeten, zwischen sich axial offene Schaufelkammern begrenzenden radialen Laufradschaufeln auf, die durch einen Außenring miteinander verbunden sind. Die Permanentmagnete sind auf dem Außenring befestigt und werden bei Ausführung des Förderaggregats in Kunststoff bevorzugt aus Plastoferriten hergestellt .Distance circumferentially spaced apart, axially between them Open blade chambers delimit radial impeller blades which are connected to one another by an outer ring. The permanent magnets are attached to the outer ring and are preferably made of plastoferrites when the conveying unit is made of plastic.
Gemäß einer vorteilhaften Ausführungsform der Erfindung ist in jeder Seitenwand der Pumpenkammer ein zum Pumpenraum hin offener, nutartiger Seitenkanal konzentrisch zur Laufradachse mit einem zwischen Seitenkanalende und Seitenkanalanfang, bezogen auf die Strömungsrichtung, verbleibenden Unterbrechersteg ausgebildet . Der Seitenkanalanfang mindestens eines Seitenkanals steht mit einer Ansaugöffnung und das Seitenkanalende mit einem Druckauslaß in Verbindung, wobei die Achsen der Zu- und Abströmkanäle von der Ansaugöffnung und zu dem Druckauslaß entweder axial oder vorzugsweise radial ausgerichtet sind. Durch die besonders vorteilhafte radiale Zu- und Abströmung des Kraftstoffs in die bzw. aus der Pumpenkammer wird eine wesentliche Reduzierung der Strömungsverluste erreicht und damit der Wirkungsgrad der Pumpe verbessert . Die radiale An- und Abströmung wird im Gegensatz zu den herkömmlichen Seitenkanalpumpen problemlos durch den aufgrund der erfindungsgemäßen Bauweise vergrößerten Außendurchmesser des Förderaggregats möglich, da dadurch in radialer Richtung genügend Bauraum für die Unterbringung entsprechender Zu- und Abströmkanäle vorhanden ist .According to an advantageous embodiment of the invention, in each side wall of the pump chamber, a groove-like side channel open to the pump chamber is formed concentrically to the impeller axis with an interrupter web remaining between the side channel end and the side channel beginning, based on the direction of flow. The side channel start of at least one side channel is connected to a suction opening and the side channel end is connected to a pressure outlet, the axes of the inlet and outlet channels from the suction opening and to the pressure outlet being either axially or preferably radially aligned. As a result of the particularly advantageous radial inflow and outflow of the fuel into and out of the pump chamber, a substantial reduction in the flow losses is achieved and the efficiency of the pump is thus improved. In contrast to the conventional side channel pumps, the radial inflow and outflow is easily possible due to the enlarged outer diameter of the delivery unit due to the construction according to the invention, since this provides sufficient installation space in the radial direction for accommodating corresponding inflow and outflow channels.
Zeichnungdrawing
Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen in schematischer Darstellung: Fig. 1 einen Längs- oder Meridialschnitt desThe invention is explained in more detail in the following description with reference to an embodiment shown in the drawing. In a schematic representation: Fig. 1 shows a longitudinal or meridional section of the
Förderaggregats, wobei der Schnitt in der oberen Hälfte der Darstellung durch das ausgebildete Strömungsgebiet und in der unteren Hälfte der Darstellung durch den Ansaugbereich des Förderaggregats geführt ist,Conveying unit, the section being made in the upper half of the illustration through the flow area formed and in the lower half of the illustration through the suction area of the conveying unit,
Fig. 2 ausschnittweise eine gleiche Darstellung wie in Fig. 1 eines modifizierten Förderaggregats.Fig. 2 shows a portion of the same representation as in Fig. 1 of a modified conveyor unit.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Das in Fig. 1 schematisch dargestellte Förderaggregat dient zum Fördern von Kraftstoff aus einem Vorratsbehälter zur Brennkraftmaschine eines Kraftfahrzeugs. Üblicherweise wird das Förderaggregat in Verbindung mit einem Filtertopf als sog. Tankeinbaueinheit in dem Kraftstoffbehälter oder Kraftstofftank des Kraftfahrzeugs angeordnet . Das Förderaggregat weist eine als Stromungs- oder Seitenkanalpumpe ausgebildete Förderpumpe 11 und einen die Förderpumpe 11 antreibenden Elektromotor 12 auf . Förderpumpe 11 und Elektromotor 12 sind in einem gemeinsamen Gehäuse 13 aufgenommen. Der Aufbau und die Wirkungsweise der Förderpumpe 11 ist bekannt und beispielsweise in der DE 40 20 521 AI beschrieben. Im Gehäuse 13 ist eine Pumpenkammer 14 ausgebildet, die in Achsrichtung von zwei sich radial erstreckenden, voneinander axial beabstandeten Seitenwänden 141,142 und in Umfangsrichtung von einer die beiden Seitenwände 141,142 längs deren kreisförmigen Peripherie miteinander verbindende Peripherwand 143 begrenzt ist . In der Pumpenkammer 14 ist ein Pumpen- oder Laufrad 16 angeordnet, das drehfest auf einer Welle 17 sitzt. Die Welle 17 ist mit beiden Wellenenden in zwei Lagern 18,19 aufgenommen, die in den beiden Seitenwänden 141,142 ausgebildet sind. Die Achse der Welle 17 ist kolinear mit der Laufradachse 161 und derThe delivery unit shown schematically in FIG. 1 serves to deliver fuel from a reservoir to the internal combustion engine of a motor vehicle. The delivery unit is usually arranged in connection with a filter bowl as a so-called tank installation unit in the fuel tank or fuel tank of the motor vehicle. The delivery unit has a delivery pump 11 designed as a flow or side channel pump and an electric motor 12 driving the delivery pump 11. Feed pump 11 and electric motor 12 are accommodated in a common housing 13. The structure and operation of the feed pump 11 is known and described for example in DE 40 20 521 AI. A pump chamber 14 is formed in the housing 13 and is delimited in the axial direction by two radially extending, axially spaced apart side walls 141, 142 and in the circumferential direction by a peripheral wall 143 connecting the two side walls 141, 142 along their circular periphery. A pump or impeller 16 is arranged in the pump chamber 14 and sits on a shaft 17 in a rotationally fixed manner. The shaft 17 is received with two shaft ends in two bearings 18, 19 which are formed in the two side walls 141, 142. The axis of the shaft 17 is colinear with the impeller axis 161 and
Achse der Pumpenkammer 14. Das Laufrad 16 weist eine Vielzahl von in Umfangsrichtung voneinander beabstandeten, radialen Laufradschaufeln 20 auf, von denen in der Zeichnung nur zwei zu sehen sind. Die Laufradschaufeln 20 sind durch einen Außenring 21 miteinander verbunden. Jeweils zwei Laufradschaufeln 20 begrenzen zwischen sich eineAxis of the pump chamber 14. The impeller 16 has a large number of radial impeller blades 20 spaced apart from one another in the circumferential direction, of which only two can be seen in the drawing. The impeller blades 20 are connected to one another by an outer ring 21. Two impeller blades 20 each delimit one between them
Schaufelkammer 22, die axial offen ist. Das Laufrad 16 liegt mit Spaltabstand den Seitenwänden 141,142 gegenüber, und der Außenring 21 schließt mit der Peripherwand 143 der Pumpenkammer 14 einen radialen Spalt ein. In jeder Seitenwand 141,142 der Pumpenkammer 14 ist ein zur Pumpenkammer 14 hin offener, nutartiger Seitenkanal 23 bzw. 24 ausgebildet, der konzentrisch zur Laufradachse 161 angeordnet ist und in Umfangsrichtung nahezu über 330° von einem Seitenkanalanfang zu einem Seitenkanalende verläuft, wobei zwischen dem Seitenkanalende und dem Seitenkanalanfang ein Unterbrechersteg verbleibt . In der Zeichnung sind im unteren Schnittbild lediglich der Seitenkanalanfang 231 und 241 der Seitenkanäle 23,24 zu sehen. Das Seitenkanalende ist demgegenüber um etwa 330° Umfangswinkel versetzt angeordnet. Jeder Seitenkanal 23,24 steht über einen radial ausgerichteten Zuströmkanal 25 bzw. 26 mit einer Ansaugöffnung 27 des Förderaggregats in Verbindung. Die hier nicht zu sehenden Seitenkanalenden der beiden Seitenkanäle 23,24 stehen über je einen Ablaufkanal mit einem Druckstutzen des Forderagreggats in Verbindung. In einer alternativen Ausführungsform der Erfindung ist nur der Seitenkanalanfang 231 des Seitenkanals 23 mit einem Zuströmkanal 25 und lediglich das Seitenkanalende des Seitenkanals 24 mit einem Abströmkanal verbunden. In diesem Fall entfällt der Zuströmkanal 26 rechts im Schnittbild, und der Seitenkanal 24 zeigt in diesem Bereich einen Querschnitt, wie er in der Zeichnung strichliniert angedeutet ist. Darüber hinaus können die Zuströmkanäle 25,26 axial angeordnet werden, jedoch hat die radiale Ausrichtung den Vorteil der geringeren Strömungεverluste und läßt sich wegen des relativ großen Außendurchmessers des Förderaggregats leicht realisieren. Der mit sog. Innenpolläufer ausgebildete Elektromotor 12 weist in bekannter Weise einen Stator 28 und einen Rotor 29 auf, der zur Erzielung einer extrem flachen Bauweise des Förderaggregats in das Laufrad 16 der Förderpumpe 11 integriert ist . Seine Magnetpole werden vonVane chamber 22 which is axially open. The impeller 16 lies opposite the side walls 141, 142 at a gap distance, and the outer ring 21 encloses a radial gap with the peripheral wall 143 of the pump chamber 14. In each side wall 141, 142 of the pump chamber 14, a groove-like side channel 23 or 24, which is open towards the pump chamber 14, is formed, which is arranged concentrically to the impeller axis 161 and extends in the circumferential direction almost over 330 ° from a side channel start to a side channel end, between the side channel end and a break bar remains at the beginning of the side channel. In the drawing, only the side channel beginning 231 and 241 of the side channels 23, 24 can be seen in the lower sectional view. In contrast, the end of the side channel is offset by a circumferential angle of approximately 330 °. Each side channel 23, 24 is connected via a radially oriented inflow channel 25 or 26 to an intake opening 27 of the delivery unit. The side channel ends of the two side channels 23, 24, which cannot be seen here, are each connected via a discharge channel to a pressure port of the delivery unit. In an alternative embodiment of the invention, only the side channel beginning 231 of the side channel 23 is connected to an inflow channel 25 and only the side channel end of the side channel 24 is connected to an outflow channel. In this case, the inflow channel 26 is omitted on the right in the sectional view, and the side channel 24 shows a cross section in this area, as is indicated by the broken lines in the drawing. In addition, the inflow channels 25, 26 can be arranged axially, but the radial alignment has the advantage of lower flow losses and is easy to implement because of the relatively large outside diameter of the delivery unit. The electric motor 12, which is designed with a so-called internal pole rotor, has a stator 28 and a rotor 29 in a known manner, which is integrated into the impeller 16 of the feed pump 11 in order to achieve an extremely flat design of the feed unit. Its magnetic poles are from
PermanentmagnetSegmenten 30 gebildet, die auf dem Außenring 21 des Laufrads 16 befestigt sind. Der Stator 28 ist als genutetes Blechpaket 31 koaxial zur Laufradachse 161 im Gehäuse 13 so angeordnet, daß die Innenringflache des Blechpakets 31 die Peripherwand 143 der Pumpenkammer 14 bildet. In den Nuten des Blechpakets 31 ist üblicherweise eine Ankerwicklung 32 angeordnet, von der in der εchematischen Zeichnung nur die beiden εtirnseitigen Wickelköpfe 321 und 322 und die beiden Anschlußleitungen 323 und 324 zu sehen sind. Im Falle eines Gleichεtromantriebs wird der Elektromotor 12 elektronisch kommutiert.Permanent magnet segments 30 formed, which are attached to the outer ring 21 of the impeller 16. The stator 28 is arranged as a grooved laminated core 31 coaxially to the impeller axis 161 in the housing 13 so that the inner ring surface of the laminated core 31 forms the peripheral wall 143 of the pump chamber 14. An armature winding 32 is usually arranged in the grooves of the laminated core 31, of which only the two winding heads 321 and 322 and the two connecting lines 323 and 324 can be seen in the schematic drawing. In the case of a direct current drive, the electric motor 12 is commutated electronically.
Wird das Laufrad 16 der Förderpumpe 11 aus Kunstεtoff hergeεtellt, εo ergibt εich ein Fertigungsvorteil, wenn die Permanentmagnetsegmente 30 aus Plastoferriten hergestellt werden .If the impeller 16 of the feed pump 11 is made of plastic, there is a manufacturing advantage if the permanent magnet segments 30 are made of plastic ferrites.
Das in Fig. 2 ausεchnittweiεe im Schnitt dargeεtellte weitere Auεführungεbeispiel des Förderaggregats ist lediglich hinεichtlich der Lagerung des Laufrads 16 im Gehäuse 13 modifiziert und stimmt im übrigen mit dem vorstehend beschriebenen Ausführungεbeiεpiel überein, εo daß gleiche Bauteile mit gleichen Bezugszeichen gekennzeichnet sind. Die Seitenwände 141 und 142 der Pumpenkammer 14 sind hier einerεeitε von einem das Gehäuse 13 stirnseitig abschließenden Deckel 131 und von einem im Gehäuse 13 angeordneten, radialen Flansch 132 gebildet. Am Gehäuseflansch 132 ist ein rechtwinklig in die Pumpenkammer 14 hineinragender Wellenstumpf 33 einstückig ausgebildet, auf dem das Laufrad 16 freidrehend gelagert ist. Nach Einsetzen des Laufrads 16 wird der Deckel 131 dicht auf das Gehäuse 13 aufgesetzt und mit diesem fest verbunden. The further exemplary embodiment of the conveying unit shown in section in FIG. 2 is only modified with regard to the mounting of the impeller 16 in the housing 13 and otherwise corresponds to the exemplary embodiment described above, so that the same components are identified with the same reference numerals. The side walls 141 and 142 of the pump chamber 14 are formed here on the one hand by a cover 131 which closes the end face of the housing 13 and by a radial flange 132 arranged in the housing 13. On the housing flange 132, a stub shaft 33 protruding at right angles into the pump chamber 14 is formed in one piece, on which the impeller 16 is freely rotating. After inserting the impeller 16 the cover 131 is placed tightly on the housing 13 and firmly connected to it.

Claims

Ansprüche Expectations
1. Förderaggregat für Kraftstoff mit einer als Strömungε- oder Seitenkanalpumpe auεgebildeten Förderpumpe (11) , die eine in einem Gehäuεe (13) auεgebildete Pumpenkammer (14) und ein in der Pumpenkammer (14) angeordneteε Pumpen- oder Laufrad (16) aufweiεt, und mit einem daε Laufrad (16) antreibenden Elektromotor (12) , der eine Ankerwicklung (32) und Permantentmagnete (30) sowie diese wechselεeitig aufnehmenden Stator (28) und Rotor (29) aufweist, dadurch gekennzeichnet, daß der Elektromotor (12) bürstenlos ausgebildet und εein Rotor (29) vom Laufrad (16) der Förderpumpe (11) gebildet ist.1. Delivery unit for fuel with a delivery pump (11) designed as a flow or side channel pump, which has a pump chamber (14) formed in a housing (13) and a pump or impeller (16) arranged in the pump chamber (14), and with an electric motor (12) driving the impeller (16), which has an armature winding (32) and permanent magnets (30) as well as a stator (28) and rotor (29) accommodating them alternately, characterized in that the electric motor (12) is brushless and εa rotor (29) is formed by the impeller (16) of the feed pump (11).
2. Förderaggregat nach Anspruch 1, dadurch gekennzeichnet, daß die Permanentmagnete (30) am Umfang deε Laufradε (16) angeordnet sind und der die Ankerwicklung (32) tragende Stator (28) koaxial zur Laufradachse (161) im Gehäuεe (13) aufgenommen ist.2. Conveyor unit according to claim 1, characterized in that the permanent magnets (30) on the circumference deε Laufradε (16) are arranged and the armature winding (32) carrying stator (28) is accommodated coaxially to the impeller axis (161) in the housing (13) .
3. Förderaggregat nach Anspruch 1 oder 2 , dadurch gekennzeichnet, daß die zylinderförmige Pumpenkammer (14) von zwei εich radial erεtreckenden, voneinander axial beabstandeten Seitenwänden (141,142) und einer die beiden Seitenwände (141,142) längs deren kreisförmigen Peripherie miteinander verbindenden Peripherwand (143) begrenzt ist, daß das Laufrad (16) jeweils mit Spaltabεtand den Seitenwänden (141,142) gegenüberliegt und daß die Innenringflache deε von einem genuteten Blechpaket (31) gebildeten Statorε (28) die Peripherwand (143) der Pumpenkammer (14) bildet.3. Delivery unit according to claim 1 or 2, characterized in that the cylindrical pump chamber (14) of two εich radially extending, axially from each other spaced side walls (141, 142) and a peripheral wall (143) connecting the two side walls (141, 142) along their circular periphery to one another, that the impeller (16) is opposite the side walls (141, 142) with a gap and that the inner ring surface of a grooved laminated core (31) formed stator (28) forms the peripheral wall (143) of the pump chamber (14).
4. Förderaggregat nach Anspruch 3, dadurch gekennzeichnet, daß das Laufrad (16) eine Vielzahl von in Umfangsrichtung voneinander beabstandeten, zwischen sich axial offene Schaufelkammern (22) begrenzenden, radialen Laufradschaufein (20) aufweiεt, die durch einen Außenring (21) miteinander verbunden εind, und daß die4. Conveyor unit according to claim 3, characterized in that the impeller (16) has a plurality of circumferentially spaced, axially open blade chambers (22) delimiting, radial impeller blades (20) which are interconnected by an outer ring (21) ε are, and that the
Permanentmagnete (30) auf dem Außenring (21) befeεtigt εind.Permanent magnets (30) are attached to the outer ring (21).
5. Förderaggregat nach Anεpruch 4, dadurch gekennzeichnet, daß die Permanentmagnete (30) auε Plaεtoferriten hergeεtellt sind.5. Conveyor unit according to Anεpruch 4, characterized in that the permanent magnets (30) auε Plaεtoferriten are manufactured.
6. Förderaggregat nach einem der Ansprüche 3 - 5 , dadurch gekennzeichnet, daß in den Seitenwänden (141,142) der Pumpenkammer (14) jeweils ein zur Pumpenkammer (14) hin offener, nutartiger Seitenkanal (23,24) konzentrisch zur Laufradachse (161) mit einem zwiεchen Seitenkanalende und Seitenkanalanfang verbleibenden Unterbrecherεteg auεgebildet iεt, daß der Seitenkanalanfang (231,241) mindestens eines Seitenkanalε (23,24) über einen6. Conveying unit according to one of claims 3-5, characterized in that in the side walls (141, 142) of the pump chamber (14) each have a groove-like side channel (23, 24) open to the pump chamber (14) concentric with the impeller axis (161) An interrupter web remaining between the side channel end and the side channel beginning is formed such that the side channel beginning (231, 241) has at least one side channel (23, 24) over a
Zuströmkanal (25,26) mit einer Ansaugöffnung (27) und das Seitenkanalende über einen Abströmkanal mit einem Druckauslaß in Verbindung steht . Inflow channel (25, 26) with an intake opening (27) and the end of the side channel is connected to a pressure outlet via an outflow channel.
7. Förderaggregat nach Anspruch 6, dadurch gekennzeichnet, daß die Achsen von Zu- und Abströmkanal (25,26) radial ausgerichtet sind.7. Delivery unit according to claim 6, characterized in that the axes of the inflow and outflow channel (25, 26) are aligned radially.
8. Förderaggregat nach Anspruch 6, dadurch gekennzeichnet, daß die Achsen von Zu- und Abströmkanal (25,26) axial ausgerichtet sind. 8. Conveyor unit according to claim 6, characterized in that the axes of the inflow and outflow channel (25, 26) are aligned axially.
EP98912245A 1997-06-19 1998-02-17 Fuel supply unit Withdrawn EP0918937A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19725941A DE19725941A1 (en) 1997-06-19 1997-06-19 Fuel delivery unit
DE19725941 1997-06-19
PCT/DE1998/000451 WO1998059173A1 (en) 1997-06-19 1998-02-17 Fuel supply unit

Publications (1)

Publication Number Publication Date
EP0918937A1 true EP0918937A1 (en) 1999-06-02

Family

ID=7832955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98912245A Withdrawn EP0918937A1 (en) 1997-06-19 1998-02-17 Fuel supply unit

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US (1) US6149404A (en)
EP (1) EP0918937A1 (en)
JP (1) JP2000517026A (en)
KR (1) KR20000068133A (en)
DE (1) DE19725941A1 (en)
WO (1) WO1998059173A1 (en)

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Also Published As

Publication number Publication date
WO1998059173A1 (en) 1998-12-30
JP2000517026A (en) 2000-12-19
US6149404A (en) 2000-11-21
DE19725941A1 (en) 1998-12-24
KR20000068133A (en) 2000-11-25

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