EP2227638B1 - Pompe centrifuge présentant une sécurité de fonctionnement accrue - Google Patents

Pompe centrifuge présentant une sécurité de fonctionnement accrue Download PDF

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Publication number
EP2227638B1
EP2227638B1 EP08849348A EP08849348A EP2227638B1 EP 2227638 B1 EP2227638 B1 EP 2227638B1 EP 08849348 A EP08849348 A EP 08849348A EP 08849348 A EP08849348 A EP 08849348A EP 2227638 B1 EP2227638 B1 EP 2227638B1
Authority
EP
European Patent Office
Prior art keywords
rotor
centrifugal pump
motor
housing
impeller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08849348A
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German (de)
English (en)
Other versions
EP2227638A1 (fr
Inventor
Hubert Herrmann
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.)
MTU Aero Engines AG
Original Assignee
MTU Aero Engines 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 MTU Aero Engines GmbH filed Critical MTU Aero Engines GmbH
Publication of EP2227638A1 publication Critical patent/EP2227638A1/fr
Application granted granted Critical
Publication of EP2227638B1 publication Critical patent/EP2227638B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F04D13/0666—Units comprising pumps and their driving means the pump being electrically driven the motor being of the plane gap type

Definitions

  • the present invention relates to an electric centrifugal pump for conveying a fluid, in particular for conveying fuel to an aircraft engine, with a housing in which a rotor shaft is rotatably mounted and on which a blast wheel for conveying the fuel is arranged, wherein for rotational drive of the rotor shaft a motor arrangement is provided around a rotor axis.
  • Centrifugal pumps have a design according to which the fluid to be delivered is sucked in axially from the direction of the rotor axis and flows off radially via the centrifugal wheel.
  • the housings of the electric centrifugal pumps are adapted to the fluid flow path, and generally surround the centrifugal wheel on the periphery.
  • pump assemblies which are connected via a drive shaft with an electric motor.
  • shaft sealing elements are required to seal the rotating shaft against the housing.
  • Such shaft sealing elements have a high tendency to wear, which can result in the promotion of fuel special hazards when the fuel can escape from a damaged sealing element.
  • wet runner pumps are known in which the motor assembly is already arranged within the housing of the centrifugal pump.
  • a drive shaft extends between the motor assembly and the spinner so that the motor assembly is disposed at the first end and the spinner is disposed at the opposite second end of the drive shaft. Consequently, there is a large design of the centrifugal pump, often the housing between the region of the motor assembly and the region of the impeller has a dividing plane.
  • Newer pump concepts for fuel delivery systems for jet engines of aircraft provide an electric drive, which drives a pump module via a drive shaft. Both failure of the engine assembly and failure of the sealing elements between the engine assembly and the centrifugal pump can result in failure of the fuel delivery to the aircraft engine.
  • a fuel pump drive for an aircraft engine which has a pump motor that drives a fuel pump via a pump shaft.
  • the sealing of the rotating pump shaft to the pump housing via radial shaft sealing elements which have a tendency to wear, which can lead to failure of the fuel pump drive.
  • the document DE 196 08 602 A1 discloses all features of the preamble of claim 1 and relates to a wet rotary type electric centrifugal pump in which the pump impeller itself forms the rotor of the electric motor. Immediately adjacent to this rotor, at least one electric stator is arranged, so that a shaft connection between the motor and the pump is not required. This design leads to an extremely compact motor-pump unit. Such units can also be combined well with multiple arrangements.
  • the at least one motor module has at least one winding body, which is connected to a respective associated power electronics for supply and control, wherein the power electronics in the case of a winding short circuit enables a shutdown of the short-circuited winding body. Due to the separate connection of the individual motor modules, a redundant structure of the motor assembly is possible.
  • a motor module comprises at least one rotor and a stator with a winding body, which can drive the centrifugal pump even when operating alone.
  • a separate power electronics is provided for each engine module and connected to this.
  • the electrical control of the centrifugal pump includes a number of power electronics units according to the number of motor modules.
  • the power electronics is designed such that a winding body is switched off as soon as a winding short circuit results in the corresponding winding body.
  • a winding fire can be avoided, since the defective winding body is switched off immediately and no further electrical energy input can take place.
  • the induction of a voltage can be avoided, which can also lead to a temperature increase within a short-circuited winding body.
  • a rotor and a stator for forming respective motor modules are arranged on both sides of the centrifugal wheel, which together form the motor assembly.
  • other motor modules be provided, so that an electrically redundant motor concept is provided, which has a lower probability of failure.
  • the blast wheel consists of two plane-parallel discs, between which there are blade elements for conveying the fuel.
  • the discs of the blast wheel can either form the rotor of the motor assembly itself, or the rotor is arranged on each of the two discs of the blast wheel and has an annular structure.
  • the pumped fluid flows around the motor assembly, so that it is designed in the manner of a wet rotor.
  • the advantage is achieved that within the housing no sealing elements are required to seal about the motor assembly against the spinner.
  • Another advantage is the effect of cooling, since the pumped fluid, in particular the fuel delivered to the aircraft engine, causes a cooling effect of the engine assembly.
  • the fuel flows around both the rotor and the stator, on which at least one winding body is accommodated. During electrical operation of the motor assembly, the winding body can heat up, so that the resulting amount of heat is dissipated by the fuel. The likelihood of a winding fire or a short circuit within the winding body is reduced by the wet-runner concept.
  • a further advantageous embodiment of the electric centrifugal pump has a rotor shaft, which is designed as a hollow shaft, wherein the fluid to be delivered enters axially into the hollow shaft. It is sufficient that the hollow shaft has an opening at least on one side in the direction of the rotor axis, into which the fuel flows as fluid to be conveyed from the direction of the rotor axis into the cavity of the hollow shaft.
  • the hollow shaft can be made in one piece with the blast wheel, wherein the hollow shaft is rotatably supported by means of a roller bearing within the housing.
  • the impeller is fluidically connected to the hollow shaft, so that the fluid from the hollow shaft enters the impeller and flows to promote this radially.
  • the centrifugal pump is thus designed as an axial-radial pump, because the fluid to be pumped flows axially against the pump and flows radially out of this.
  • the inventive design of the rotor shaft as a hollow shaft with a fluidically connected to the interior of the hollow shaft impeller and the arrangement of the rotor of the motor assembly in or on the impeller provides a very compact design of a centrifugal pump, in which the rotor of the motor assembly and the impeller of the pump designed integrated are.
  • the bearing of the rotor of the motor assembly and the impeller of the pump is also made by the double executed rolling bearing at the front and rear ends of the rotor shaft, wherein the storage is also surrounded by the fluid to be pumped.
  • This can be carried out either as an encapsulated storage, wherein advantageously also the storage is lubricated by the fluid to be delivered. Consequently, the mechanical failure of the rolling bearing is to be regarded as very low, since at least overheating of the rolling bearing can be excluded.
  • the housing encloses according to the embodiment of the invention, the rotor shaft radially and on one side axially.
  • the housing has an open and a closed end, wherein the housing for the axial flow of the rotor shaft through the fluid to be conveyed has a concentrically formed around the rotor axis housing flange, which is opposite to the closed side of the housing in the direction of the rotor axis, said to be pumped fluid enters the housing through the housing flange, wherein the housing via the housing flange to a receptacle can be flanged and sealed against this. Consequently, the housing has only a fluid inlet and a fluid outlet, so that consequently only static seals are required.
  • the housing is preferably designed in two parts, wherein the dividing plane of the two housing halves lies in the plane of extent of the centrifugal wheel. This results in a simplified assembly of the centrifugal pump and in particular the integrated motor assembly, wherein the assembly can be made from the direction of the motor axis.
  • the connection of the two housing halves can be done by screw elements, wherein Furthermore, a sealing element is provided in the dividing plane for sealing the housing halves against each other.
  • the rotors may be designed in the manner of a type, annular disk rotors, which may have one-sided grooved short-circuit cages.
  • An advantageous embodiment of the motor modules can be achieved by a type of axial flux machine, which is designed as an asynchronous motor or as a reluctance motor with one-sided slotted star rotors.
  • centrifugal pump has rotors, which are designed as magnetic rotors with permanent magnets inserted.
  • the permanent magnets can also be used directly in the blast wheel, this from made of a magnetic material.
  • the permanent magnets can be arranged on the circumference of the impeller in the lateral direction equally spaced from each other, wherein the arrangement by a screw, sticking or wedging in the impeller is possible. The torque generated by the arrangement of an axial flux machine thus formed is transmitted directly to the spinner, so that it is rotated together with the rotor shaft in rotation.
  • a further increase in the reliability is achieved in that the individual motor modules of a rotor and a stator have a rated power, which is sufficient in each case for driving the pump. In particular, consequential damage can be avoided in this way, since a shutdown of a short-circuited motor winding can not cause a fire or the like.
  • the power electronics associated with the motor module can be designed in such a way that it allows a minimum or maximum power consumption of the motor winding, within which the motor modules are operated. If the parameters of the supply of the individual motor modules leave the preset minimum and maximum values, the motor module can be automatically switched off.
  • the motor module, which drives the pump as the remaining motor module can be controlled by a correspondingly higher power to compensate for the failure of the defective motor module. Consequently, defying a failure of a separate motor winding, there is no failure or interruption of the fuel supply to the aircraft engine, allowing for maximum operational safety.
  • FIG. 1 an electric centrifugal pump according to the invention is shown, which is designated by the reference numeral 1. This is shown in half section, wherein the rotor axis 5 forms the line of symmetry and only the upper half section is shown.
  • the housing 2 is made in two parts and has a closed rear part and an open front part.
  • the opening of the front part of the housing 2 is formed by the housing flange 8, through which the fluid to be delivered can flow into the housing 2.
  • the fluid flow path 10 is marked with an arrow, wherein the fluid after entry into the housing 2 first enters into a rotor shaft 3, which is designed as a hollow shaft.
  • a blast wheel 4 is arranged, which is fluidly connected to the inner region of the hollow shaft. Consequently, the fluid flow path 10 initially runs parallel to the rotor axis 5, so that the centrifugal pump flows axially. After entering the cavity of the rotor shaft 3, the fluid passes into the impeller 4 and is accelerated radially outward.
  • the impeller 4 has the structure of a face plate, wherein according to the embodiment of the invention, the electric centrifugal pump both on the left side and on the right side of the outer plan face of the impeller 4 per a rotor 6 is arranged.
  • a respective stator 7 is arranged plane-parallel to the left-side and right-side rotor 6, on which a winding body 9 is applied.
  • the arrangement of the rotor 6, the stator 7 and the winding body 9 together form a separate motor module, so that according to the present Design two motor modules are integrated within the housing 2.
  • a torque is generated which acts on the rotor 6. Consequently, the blast wheel 4 is set in a rotational movement, so that it is driven in rotation together with the rotor shaft 3.
  • the rotor shaft 3 is mounted in a rolling bearing 11 within the housing 2, so that the centrifugal pump requires no dynamic seals.
  • the rotating component is integrated only within the housing 2, and no drive shaft emerges from the housing to drive the spinner 4.
  • the electric centrifugal pump 1 is designed as a wet rotor, so that both the motor modules and the bearing 11 are exposed to the fluid to be delivered.
  • the fluid flows around both the bearing 11 and the rotors 6 and stators 7 and the winding body 9, and produces a cooling effect. Consequently, a failure of the centrifugal pump 1 due to the overheating of a winding body 9 or a rolling bearing 11 is unlikely, so that in this way the reliability is further increased.
  • FIG. 2 shows a further embodiment of a possible motor arrangement, which consists of a total of four motor modules.
  • Each motor module has a rotor 6 and a stator 7, on each of which a winding body 9 is applied.
  • the representation of the winding body 9 is shown symbolically, wherein this has a star connection.
  • the rotors 6 are designed as double-acting rotors, so that it forms a respective motor module with both the left-side and the right-side adjacent stator 7.
  • the double arrangement of two stators 7 and a rotor 6 is provided twice on the rotor shaft, so that here too the redundancy causes an increase in the reliability.
  • the illustrated rotors 6 may be respective centrifugal wheels, so that the centrifugal pump 1 has a total of two centrifugal wheels.
  • the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

L'invention concerne une pompe centrifuge électrique (1) destinée à transporter un fluide, notamment du carburant vers une turbine d'avion, comportant un boîtier (2) dans lequel un arbre de rotor (3) est logé rotatif et une roue centrifuge (4) est disposée sur l'arbre de rotor (3) pour le transport du carburant. Un système de moteur est prévu pour l'entraînement rotatif de l'arbre de rotor (3) autour d'un axe de rotor (5). Selon l'invention, la roue centrifuge (4) comporte au moins un rotor (6) et au moins un stator (7) est disposé de façon plane et parallèle à côté du rotor (6), dans le boîtier (2), de telle manière que le rotor (6) et le stator (7) forment le système de moteur.

Claims (11)

  1. Pompe centrifuge (1) électrique servant à transporter un fluide, en particulier servant à transporter du carburant vers un groupe motopropulseur d'un avion, comprenant un carter (2), dans lequel est logé de manière à pouvoir tourner un arbre de rotor (3), sur lequel est disposée une roue centrifuge (4) servant à transporter le carburant, un système moteur étant prévu pour l'entraînement en rotation de l'arbre de rotor (3) autour d'un axe de rotor (5), et la roue centrifuge (4) présentant au moins un rotor (6) et au moins un stator (7) étant disposé dans le carter (2) de manière parallèle en plan à proximité du rotor (6), de sorte que le rotor (6) forme avec le stator (7) le système moteur sous la forme d'un module de moteur, caractérisée en ce que chaque module de moteur présente au moins un corps d'enroulement (9) qui est relié à une électronique de puissance respectivement associée pour l'alimentation et la commande, l'électronique de puissance rendant possible dans le cas d'un court-circuit d'enroulement une mise hors service du corps d'enroulement (9) court-circuité.
  2. Pompe centrifuge (1) électrique selon la revendication 1,
    caractérisée en ce qu'un rotor (6) et un stator (7) sont disposés de part et d'autre de la roue centrifuge (4) pour former respectivement des modules de moteur, lesquels forment conjointement le système moteur.
  3. Pompe centrifuge (1) électrique selon la revendication 1 ou 2,
    caractérisée en ce que le fluide transporté arrose le système moteur, de sorte que ce dernier est réalisé à la manière d'un moteur à rotor immergé.
  4. Pompe centrifuge (1) électrique selon l'une quelconque des revendications 1 à 3, caractérisée en ce que l'arbre de rotor (3) est réalisé comme un arbre creux, et en ce que le fluide à transporter entre de manière axiale dans l'arbre creux.
  5. Pompe centrifuge (1) électrique selon l'une quelconque des revendications précédentes, caractérisée en ce que la roue centrifuge (4) est en liaison fluidique avec l'arbre creux, et en ce que le fluide entre depuis l'arbre creux dans la roue centrifuge et s'évacue pour le transportement de manière radiale par cette dernière.
  6. Pompe centrifuge (1) électrique selon l'une quelconque des revendications précédentes, caractérisée en ce que le carter (2) entoure radialement et axialement d'un côté l'arbre de rotor (3) et présente une bride de carter (8) réalisée de manière concentrique autour de l'axe de rotor (5) afin que le fluide s'écoule de manière axiale à travers l'arbre de rotor (3), par laquelle le fluide pénètre dans le carter (2) et par l'intermédiaire de laquelle le carter (2) peut être bridé et étanchéifié au niveau d'un logement.
  7. Pompe centrifuge (1) électrique selon l'une quelconque des revendications précédentes, caractérisée en ce que le carter (2) est réalisé en deux parties, et en ce que le plan de division se situe dans le plan d'extension de la roue centrifuge (4).
  8. Pompe centrifuge (1) électrique selon l'une quelconque des revendications précédentes, caractérisée en ce que les rotors (6) sont réalisés à la manière de rotors à disque feuilletés, annulaires et présentent d'un côté des cages à écureuil rainurées.
  9. Pompe centrifuge (1) électrique selon l'une quelconque des revendications 1 à 7, caractérisée en ce que les modules de moteur sont respectivement réalisés comme un moteur asynchrone agissant à la manière d'une machine à flux axial ou comme un moteur à reluctance comportant des rotors (6) fendus d'un côté en forme d'étoile.
  10. Pompe centrifuge (1) électrique selon l'une quelconque des revendications 1 à 7, caractérisée en ce que les rotors (6) sont réalisés comme des rotors magnétiques comportant des aimants permanents insérés, ou en ce que les aimants permanents sont insérés directement dans la roue centrifuge (4) pour former les rotors (6), la roue centrifuge étant fabriquée à partir d'un matériau non magnétique.
  11. Pompe centrifuge (1) électrique selon l'une quelconque des revendications précédentes, caractérisée en ce que les modules de moteur individuels formés à partir d'un rotor (6) et d'un stator (7) présentent chacun une puissance nominale qui est respectivement suffisante pour l'entrainement de la pompe.
EP08849348A 2007-11-17 2008-11-07 Pompe centrifuge présentant une sécurité de fonctionnement accrue Not-in-force EP2227638B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007054947A DE102007054947A1 (de) 2007-11-17 2007-11-17 Zentrifugalpumpe mit einer erhöhten Betriebssicherheit
PCT/DE2008/001840 WO2009062474A1 (fr) 2007-11-17 2008-11-07 Pompe centrifuge présentant une sécurité de fonctionnement accrue

Publications (2)

Publication Number Publication Date
EP2227638A1 EP2227638A1 (fr) 2010-09-15
EP2227638B1 true EP2227638B1 (fr) 2012-08-01

Family

ID=40433907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08849348A Not-in-force EP2227638B1 (fr) 2007-11-17 2008-11-07 Pompe centrifuge présentant une sécurité de fonctionnement accrue

Country Status (6)

Country Link
US (1) US20110008195A1 (fr)
EP (1) EP2227638B1 (fr)
JP (1) JP5518729B2 (fr)
CA (1) CA2705915A1 (fr)
DE (1) DE102007054947A1 (fr)
WO (1) WO2009062474A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024117700A1 (de) * 2024-06-24 2025-12-24 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Drehstrommaschine, Hydraulikpumpe und ein Verfahren zum Betreiben derselben

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB582036A (en) * 1944-07-07 1946-11-01 Maldwyn Lewis Thomas Improved combined pump and electric motor unit
DE1638272B2 (de) * 1968-03-02 1975-05-28 Siemens Ag, 1000 Berlin Und 8000 Muenchen Pumpe mit Spaltrohrmotor
JPS58163255A (ja) * 1982-03-24 1983-09-28 Okuma Mach Works Ltd 永久磁石式同期モ−タの回転子
US5130616A (en) * 1990-11-13 1992-07-14 Southwest Electric Company Motor control system and components thereof
WO1996018817A1 (fr) * 1994-12-14 1996-06-20 The Ingersoll-Dresser Pump Company Roue
US5769069A (en) * 1995-06-07 1998-06-23 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Natural Resources Low flow-rate pump
WO1997008807A1 (fr) * 1995-08-24 1997-03-06 Sulzer Electronics Ag Moteur electrique
DE19608602A1 (de) * 1996-03-06 1997-09-11 Peter Dipl Ing Mette Stopfbuchslose Strömungsmaschine mit einem Laufrad radialer Bauart
US6254359B1 (en) * 1996-05-10 2001-07-03 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method for providing a jewel bearing for supporting a pump rotor shaft
US5737164A (en) * 1996-07-11 1998-04-07 Sundstrand Corporation Switched reluctance machine capable of improved fault operation
FR2788313B1 (fr) * 1999-01-13 2001-03-30 Technicatome Pompe centrifuge a moteur discoidal integre destinee a la circulation d'ammoniac dans un satellite
DE19908531A1 (de) 1999-02-28 2000-09-07 Mtu Muenchen Gmbh Kraftstoffpumpenantrieb eines Flugtriebwerks und Flugtriebwerk
US6675570B2 (en) 2000-06-15 2004-01-13 Argo-Tech Corporation Low-cost general aviation fuel control system
DE10330434A1 (de) * 2003-07-04 2005-02-03 Jostra Ag Zentrifugal-Pumpe
US7468876B2 (en) * 2006-01-06 2008-12-23 Inpower Llc Safety switch

Also Published As

Publication number Publication date
CA2705915A1 (fr) 2009-05-22
DE102007054947A1 (de) 2009-05-20
WO2009062474A1 (fr) 2009-05-22
JP2011503425A (ja) 2011-01-27
JP5518729B2 (ja) 2014-06-11
EP2227638A1 (fr) 2010-09-15
US20110008195A1 (en) 2011-01-13

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