EP3346132B1 - Lubricating unit for an aircraft turbine engine, comprising a dynamo-pump - Google Patents

Lubricating unit for an aircraft turbine engine, comprising a dynamo-pump Download PDF

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Publication number
EP3346132B1
EP3346132B1 EP18150265.9A EP18150265A EP3346132B1 EP 3346132 B1 EP3346132 B1 EP 3346132B1 EP 18150265 A EP18150265 A EP 18150265A EP 3346132 B1 EP3346132 B1 EP 3346132B1
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EP
European Patent Office
Prior art keywords
pinion
turbine engine
rotor
electrical
fluid
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EP18150265.9A
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German (de)
French (fr)
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EP3346132A1 (en
Inventor
Mathieu Chenoux
Michael MARICHAL
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Safran Aero Boosters SA
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Safran Aero Boosters SA
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Publication of EP3346132A1 publication Critical patent/EP3346132A1/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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor

Definitions

  • the present invention relates to a lubrication group for an aircraft turbomachine. According to a second aspect, the present invention relates to a method of converting mechanical energy into hydraulic energy and electrical energy.
  • auxiliary electrical devices such as sensors
  • these auxiliary electrical devices are supplied by a source external to the lubrication group.
  • the electrical supplies may have to be modified according to the model of lubrication group.
  • the wiring may have to join the fuselage of the aircraft, which makes it complicated and potentially subject to ruptures.
  • the document US2010 / 130327 A1 describes a pump comprising a pinion and a crown.
  • the rotor of an engine is fixed to the crown.
  • the document FR3027625 A1 describes an aircraft turbomachine comprising an electric current generator allowing the injection of oil from the interior of a turbine shaft.
  • the document US8143754 B2 discloses a generator system for a vehicle comprising a hydraulic motor and an electric generator.
  • the hydraulic motor converts hydraulic power into mechanical energy of rotation
  • the generator converts mechanical energy of rotation into electrical energy.
  • This system could be integrated into a lubrication group. However, this would also require incorporating a pump upstream of the hydraulic motor to supply it, and this pump should be supplied with electrical energy.
  • This known system therefore does not solve the problem of supplying electricity from a lubrication group.
  • the need to install a pump, a hydraulic motor and an electric generator in the lubrication group makes the assembly particularly bulky, expensive and heavy.
  • one of the aims of the invention is to provide a lubrication group equipped with an inexpensive electric generator, the presence of which has little influence on the volume and the weight of the lubrication group.
  • the invention provides an aircraft turbomachine according to claim 1.
  • the electric generator provided in the invention has a pump function in addition to its function of generating electrical energy. It therefore forms, in a single unit, a generator and a pump. When integrated into the lubrication group, it can replace a pump. Since according to the arrangement of the electric generator, the rotor and the stator are around the pinion and the crown, the electric generator takes up little or no more space than the pump which it replaces. This makes it particularly easy to integrate into the lubrication group and it allows that its presence does not significantly increase the volume or the weight of the lubrication group.
  • the electric generator provided in the invention is intended to be driven, via the drive means, by a mechanical drive device which can be a drive shaft of a turbomachine comprising the lubrication group.
  • a movement, for example a rotation of this mechanical drive device causes a rotation of the pinion, which causes a rotation of the crown and thus pumps the fluid.
  • the rotor magnets rotate with the crown and this rotation produces electrical energy in the stator coils. Consequently, the mechanical energy originating from the rotation of the engine shaft of the turbomachine is converted into hydraulic energy and into electrical energy.
  • the generator provided in the invention therefore allows the supply of auxiliary electrical devices, such as sensors, present in the lubrication group, without having to call on electrical sources external to the lubrication group. This eliminates the need for a power supply to the lubrication group.
  • the electric generator provided in the invention allows a great simplification of design since a single element (the electric generator provided in the invention) replaces two elements (the traditional pump and the traditional electric generator). This also simplifies maintenance since a single removal is sufficient for the electric generator provided in the invention, instead of a removal for a traditional pump and a removal for a traditional electric generator.
  • the number of parts is less and their arrangement allows a reduction in volume and a reduction in mass compared to a system comprising a traditional pump and a traditional electric generator. This allows the electric generator provided in the invention to be cheaper than that comprising a traditional pump and a traditional electric generator.
  • the electric generator takes less power from the mechanical drive device than a system comprising a traditional pump and a traditional electric generator because the number of drive elements is reduced.
  • the electric generator reduces oil consumption compared to a system comprising a traditional pump and a traditional electric generator because it reduces the number of parts requiring lubrication.
  • the electric generator provided in the invention can be called “generator-pump device”, “generator-pump” or “dynamo-pump”.
  • the electric generator provided in the invention makes it possible to supply relatively low powers, of maximum 100 W, which are suitable for supplying auxiliary electric devices such as sensors.
  • the electric generator provided in the invention is driven mechanically via the drive means and not hydraulically. Indeed, a hydraulic drive of the electric generator would cause hydraulic energy to be lost while the electric generator provided in the invention makes it possible to generate hydraulic energy.
  • a "lubrication group” is a set of equipment allowing lubrication.
  • the fluid pumped by the internal gear pump is a liquid.
  • the fluid pumped by the internal gear pump is a lubricating liquid, for example oil.
  • the auxiliary electrical device is not part of the electrical generator.
  • a mechanical coupling can be for example a direct attachment (that is to say without an intermediate element) or an indirect attachment (that is to say via at least one intermediate element).
  • Mechanical coupling can be permanent or temporary. Mechanical coupling can be fixed or allow the mechanically coupled elements to move relative to each other.
  • a drive can be for example a direct drive (that is to say without an intermediate element) or an indirect drive (that is to say via at least one intermediate element).
  • an "auxiliary electrical device” is an electrical device that requires a supply of electricity.
  • the auxiliary electrical device requires a relatively low electrical power, for example from 0.1 to 100 W. It is preferably included in a lubrication group comprising the electric generator.
  • the auxiliary electrical device may for example be an oil level sensor, an oil deterioration degree sensor or a particle in oil detector.
  • the auxiliary electrical device can be outside the lubrication group comprising the electric generator.
  • the auxiliary electric device can be part of a system for injecting the turbomachine, a communication system with an aircraft cabin or an aircraft FADEC system.
  • the lubrication group further comprises the auxiliary electrical device which is electrically connected to the electric generator via the electrical connection means.
  • the electrical device included in the lubrication group is directly supplied by an electrical source from the lubrication group. This allows local generation of the electricity necessary for the auxiliary electrical device. This avoids electrical wiring entering or leaving the lubrication group. This also allows the manufacturer of the lubrication group to directly adapt the specifications of the electric generator to those of the auxiliary electric device (s).
  • the auxiliary electrical device can for example be a sensor such as an oil level sensor in the lubrication group or a particle detector in the lubrication liquid.
  • the drive means is fixed to the pinion.
  • the drive means comprises a pinion shaft.
  • the pinion shaft is preferably in the axis of rotation of the pinion.
  • the pinion shaft comprises meshing teeth arranged to be meshed by the mechanical drive device.
  • the electrical connection means comprises an electrical wire or a plurality of electrical wires.
  • the electric generator comprises a fluid connection between a space pump located between the pinion and the crown and the rotor, so that the rotor is immersed in a fluid circulating in the pumping space.
  • This provides lubrication of the rotor if the fluid being pumped is a lubricating fluid.
  • the electric generator comprises a sealing jacket located between the rotor and the stator.
  • the sealing jacket is a means of blocking fluid.
  • the sealing jacket is used to prevent the fluid circulating in the pump, and in particular in the pumping space, from reaching the stator. This fluid could damage the stator coils.
  • the sealing jacket is preferably an essentially cylindrical element impermeable to the pumped fluid. It can be called "stator shirt”.
  • the sealing jacket is preferably made of an electrically insulating material so that it does not disturb the magnetic signal between the rotor and the stator.
  • the sealing jacket is arranged to serve as a bearing for the rotor.
  • the distance between the sealing jacket and the rotor is preferably chosen so that a film of lubrication liquid is formed between the two, so as to allow a smooth and regular rotation of the rotor while the stator remains stationary.
  • This bearing can be considered as a hydraulic or hydrodynamic bearing.
  • the electric generator comprises an interruption means making it possible to interrupt the transfer of electric energy while maintaining the rotations of the pinion and the crown.
  • the interrupting means can interrupt the generation of electrical energy or it can interrupt the transfer of electrical energy to the auxiliary electrical device.
  • the interrupting means is preferably located on the electrical connection means. This can for example be a switch located on the electrical connection means.
  • the electric generator comprises a casing, an interior surface of which defines a cavity in which the pinion, the crown, the rotor and the stator are located, the stator being mechanically coupled to said interior surface and the casing being pierced with a first opening forming part of the fluid inlet, a second opening forming part of the fluid outlet and a third opening for the drive means.
  • the casing provides good protection for the electric generator.
  • the stator coils are preferably mechanically coupled to the housing in order to save space and reduce the number of parts of the electric generator.
  • the casing includes a fourth opening for the electrical connection means.
  • the fluid inlet and outlet have a direction having a component parallel to the axis of rotation of the crown.
  • these input and output are not radial, but have a direction having an axial component or have an axial direction.
  • the fluid inlet and outlet are essentially parallel to the axis of rotation of the crown.
  • the turbomachine according to the invention is particularly advantageous because it allows a recovery of part of the rotational energy of the motor shaft into electrical energy and pumping.
  • the electric generator is preferably part of a lubrication group of the turbomachine.
  • the auxiliary electrical device is part of the same lubrication group.
  • the mechanical drive device further comprises a reduction box and / or gears mechanically coupling the drive shaft to the drive means.
  • the auxiliary electrical device is part of a turbomachine injection system, of a communication system with an aircraft cabin or of an FADEC system of the aircraft .
  • the turbomachine may include an injection system comprising the auxiliary electrical device supplied by the generator. It is also possible that the turbomachine is in communication with the cabin of the aircraft thanks to the auxiliary electrical device so that an exchange of information can be carried out between the cabin of the aircraft and the turbomachine. It is also possible that the auxiliary electrical device includes a part of a FADEC system installed in the turbomachine.
  • the invention provides a method of converting mechanical energy into hydraulic energy and electrical energy according to claim 13.
  • first and second serve only to differentiate between the different elements and do not imply an order between them.
  • the figure 1 is an exploded view of an electric generator 1 provided in an embodiment of the invention.
  • the electric generator comprises a pinion 11, a crown 12 arranged around the pinion 11 and a drive means mechanically coupled to the pinion 11.
  • the drive means is provided to supply the pinion 11 with mechanical energy from a mechanical device d drive outside the electric generator 1.
  • the ring gear 12 and the pinion 11 have axes of rotation parallel and offset with respect to each other.
  • the drive means is fixed to a surface of the pinion 11 perpendicular to the axis of rotation of the pinion 11.
  • the drive means comprises a pinion shaft 23.
  • the pinion shaft 23 may include meshing teeth 24 arranged to be meshed by the mechanical drive device.
  • the pinion 11 and the crown 12 form an internal gear pump which is included in the electric generator 1.
  • the crown 12 is mechanically driven by the pinion 11.
  • the pinion 11 has teeth on an outer surface which are meshed with teeth that the crown 12 has on an inner surface.
  • the space between the pinion 11 and the crown 12 is called the pumping space 6 (visible figure 2 ).
  • Space pumping 6 comprises a first space, or low pressure space, on which opens a fluid inlet of the electric generator 1, and a second space, or high pressure space, on which opens a fluid outlet of the electric generator 1.
  • the rotations of the pinion 11 and crown 12 have the effect of displacing a fluid from the low pressure space to the high pressure space by compressing it.
  • the fluid leaving through the fluid outlet is thus at a higher pressure than the fluid entering through the fluid inlet.
  • the fluid inlet forms a first fluid connection between the low pressure space and a first fluid line which makes it possible to supply the fluid to the internal gear pump from a first piece of equipment external to the electric generator 1.
  • the fluid outlet forms a second connection fluid between the high pressure space and a second fluid line which allows the fluid to exit the internal gear pump to bring the fluid to a second equipment external to the electric generator 1.
  • the first and second fluid lines are preferably part a lubrication group comprising the electric generator 1.
  • the electric generator 1 also comprises a rotor 13 comprising magnets 3 and a stator 14 situated around the rotor 13.
  • the magnets 3 are mechanically coupled to the crown 12 so that all of the magnets 3 rotate with the crown 12.
  • the magnets 3 are preferably fixed to the crown 12.
  • the magnets 3 are preferably permanent magnets.
  • the rotor 13 comprises a magnet support 18 mechanically coupling the magnets 3 to the crown 12.
  • the rotor 13 can comprise a hoop 19 making it possible to increase its solidity.
  • the stator 14 comprises conductive coils arranged so that the rotation of the rotor 13 generates electrical energy there.
  • the rotor 13 and the stator 14 are configured in a squirrel cage.
  • the electrical generator 1 also comprises an electrical connection means (not shown) electrically connected to the coils of the stator 14 and making it possible to transfer the electrical energy generated in the coils to one or more auxiliary electrical device (s) ).
  • the electrical connection means comprises an electrical wire or a plurality of electrical wires.
  • the electrical connection means allows electrical or electromagnetic coupling between the coils and the auxiliary electrical device.
  • the connection means thus makes it possible to supply electricity to the auxiliary electrical device.
  • the auxiliary electrical device is preferably part of a lubrication group in which the electric generator 1 is integrated.
  • the auxiliary electrical device is preferably part of a turbomachine in which the electric generator 1 is integrated.
  • the electric generator 1 comprises an interruption means arranged to interrupt the supply of electric energy by the electric generator 1 while maintaining the rotations of the pinion 11 and the crown 12, so as to continue the compression fluid supplied by the electric generator 1.
  • the electric generator 1 is preferably arranged so that the electric power that it generates is from 0.1 to 100 W, more preferably between 1 and 50 W, even more preferably between 2 and 10 W. This corresponds to the powers generally required by auxiliary electrical devices such as sensors.
  • the electric generator 1 is preferably arranged so that the electric voltage which it generates is from 1 mV to 10 V, more preferably from 10 mV to 1 V. This corresponds to the voltages generally required by auxiliary electric devices such as sensors.
  • the electric generator 1 is preferably included in a lubrication group.
  • the lubrication group is included in a turbomachine.
  • the mechanical drive device is preferably included in the turbomachine or in the lubrication group.
  • the mechanical drive device comprises a drive shaft of the turbomachine.
  • the mechanical drive device comprises a reduction box.
  • the motor shaft can be mechanically connected in rotation with the reduction box, for example by a gear, and the reduction box can be mechanically connected by means of drive of the electric generator 1, for example by a gear.
  • the rotation of the motor shaft causes the rotation of the pinion 11.
  • the electric generator 1 is arranged so that there is a fluid connection between the pumping space 6 and the rotor 13 so that the rotor 13 is immersed in the fluid. This ensures good lubrication of the rotor 13. Fluid communication can for example be carried out via a clearance space between the ring 12 and elements adjacent to the ring 12 and offset axially relative to the ring 12.
  • the electric generator 1 comprises a sealing jacket 15 between the rotor 13 and the stator 14 to prevent the fluid pumped by the internal gear pump from coming into contact with the stator 14.
  • the sealing jacket 15 serves to compensate for the rotor 13.
  • the rotor 13 and the inner surface of the sealing jacket 15 can be in fluid contact with the pumping space 6, this which allows the fluid to bathe the rotor 13 and to create a lubricating film between the rotor 13 and the inner surface of the sealing jacket 15 so that the sealing jacket 15 serves to smoothly compensate the rotor 13.
  • the figure 2 is a sectional view of the electric generator 1 provided in an embodiment of the invention.
  • the figure 2 illustrates a casing 16 of the electric generator 1.
  • the casing 16 has an interior surface 17.
  • the internal surface 17 preferably has a cylindrical part having as its axis of revolution the axis of rotation of the crown 12.
  • the internal surface 17 preferably has two end parts (not shown) at the ends of the cylindrical part. The end portions may be essentially planar.
  • the internal surface 17 defines a cavity in which the pinion 11, the crown 12, the rotor 13 and the stator 14 are located. In one embodiment, the coils of the stator 14 are fixed to the internal surface 17.
  • the casing 16 preferably has a first opening for the entry of the fluid into the pumping space 6.
  • This first opening forms part of the fluid inlet of the electric generator 1.
  • the first opening preferably has a direction having a parallel component to the axis of rotation of the crown 12. In other words, the first opening is at least partially axial. This simplifies the arrangement of the generator.
  • the first opening may be in one of the end portions of the interior surface 17.
  • the casing 16 preferably has a second opening for the outlet of the fluid from the pumping space 6.
  • This second opening forms part of the fluid outlet of the electric generator 1.
  • the second opening preferably has a direction having a component parallel to the 'axis of rotation of the crown 12. In other words, the second opening is at least partially axial. This simplifies the arrangement of the generator.
  • the second opening may be in one of the end portions of the interior surface 17.
  • the casing 16 preferably has a third opening for the passage of the drive means.
  • the third opening is preferably in the continuation of the axis of rotation of the pinion 11.
  • the third opening can be in one of the end portions of the interior surface 17.
  • the third opening can be arranged to allow the pinion shaft 23 to pass through.
  • the meshing teeth of the pinion shaft 23 are preferably outside the casing 16.
  • the casing 16 preferably has a fourth opening for the passage of the electrical connection means.
  • the invention relates to an aircraft turbomachine comprising a generator-pump device integrating a pump and an electric generator in a particularly reduced volume.
  • a rotation of a pinion shaft 23 causes a rotation of a pinion 11 which causes a rotation of a crown 12.
  • the rotations of the pinion 11 and of the crown 12 create a pumping of fluid from a fluid inlet towards an outlet fluidics of the device.
  • Magnets 3 are fixed on the crown 12 so as to form a rotor 13.
  • the rotation of this rotor 13 relative to a stator 14 results in the production of electrical energy.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Description

Domaine techniqueTechnical area

Selon un premier aspect, la présente invention concerne un groupe de lubrification pour turbomachine d'aéronef. Selon un deuxième aspect, la présente invention concerne une méthode de conversion d'énergie mécanique en énergie hydraulique et énergie électrique.According to a first aspect, the present invention relates to a lubrication group for an aircraft turbomachine. According to a second aspect, the present invention relates to a method of converting mechanical energy into hydraulic energy and electrical energy.

Art antérieurPrior art

Il peut être intéressant de placer dans un groupe de lubrification d'une turbomachine d'aéronef des dispositifs électriques auxiliaires, comme des capteurs, aidant au fonctionnement dudit groupe de lubrification. Dans des systèmes connus, ces dispositifs électriques auxiliaires sont alimentés par une source externe au groupe de lubrification. Cela entraine des problèmes d'intégration des connexions électriques avec l'extérieur du groupe de lubrification. En effet, comme les spécifications en alimentation de chaque modèle de groupe de lubrification peuvent être différentes, en fonction des dispositifs électriques auxiliaires intégrés, les arrivées en électricité peuvent devoir être modifiées selon le modèle de groupe de lubrification. En outre, en particulier dans le cas d'un groupe de lubrification pour turbomachine d'aéronef, le câblage peut devoir rejoindre le fuselage de l'aéronef, ce qui le rend compliqué et potentiellement sujet aux ruptures.It may be advantageous to place auxiliary electrical devices, such as sensors, in a lubrication group of an aircraft turbomachine, helping the operation of said lubrication group. In known systems, these auxiliary electrical devices are supplied by a source external to the lubrication group. This leads to problems of integration of the electrical connections with the outside of the lubrication group. In fact, since the power supply specifications for each model of lubrication group can be different, depending on the integrated auxiliary electrical devices, the electrical supplies may have to be modified according to the model of lubrication group. In addition, in particular in the case of a lubrication group for an aircraft turbomachine, the wiring may have to join the fuselage of the aircraft, which makes it complicated and potentially subject to ruptures.

Il existe donc un problème de fournir de l'électricité à des dispositifs électriques auxiliaires d'un groupe de lubrification pour turbomachine d'aéronef à partir d'une source interne au groupe de lubrification.There is therefore a problem of supplying electricity to auxiliary electrical devices of a lubrication group for an aircraft turbomachine from a source internal to the lubrication group.

Une solution possible est d'installer un générateur électrique dans le groupe de lubrification. Cela donnerait cependant un système lourd, cher et encombrant.One possible solution is to install an electric generator in the lubrication group. However, this would result in a heavy, expensive and bulky system.

Le document US2010/130327 A1 décrit une pompe comprenant un pignon et une couronne. Le rotor d'un moteur est fixé à la couronne.The document US2010 / 130327 A1 describes a pump comprising a pinion and a crown. The rotor of an engine is fixed to the crown.

Le document WO2013/185127 A2 décrit un générateur pompe.The document WO2013 / 185127 A2 describes a pump generator.

Le document FR3027625 A1 décrit une turbomachine pour aéronef comprenant un générateur de courant électrique permettant l'injection d'huile depuis l'intérieur d'un arbre de turbine.The document FR3027625 A1 describes an aircraft turbomachine comprising an electric current generator allowing the injection of oil from the interior of a turbine shaft.

Le document US8143754 B2 divulgue un système de générateur pour véhicule comprenant un moteur hydraulique et un générateur électrique. Le moteur hydraulique convertit de la puissance hydraulique en énergie mécanique de rotation, et le générateur convertit l'énergie mécanique de rotation en énergie électrique. Ce système pourrait être intégré dans un groupe de lubrification. Cependant, cela nécessiterait d'y intégrer aussi un pompe en amont du moteur hydraulique pour l'alimenter, et cette pompe devrait être alimentée en énergie électrique. Ce système connu ne résout donc pas le problème de fournir de l'électricité à partir d'un groupe de lubrification. En outre, la nécessité d'installer une pompe, un moteur hydraulique et un générateur électrique dans le groupe de lubrification rend l'ensemble particulièrement encombrant, onéreux et lourd.The document US8143754 B2 discloses a generator system for a vehicle comprising a hydraulic motor and an electric generator. The hydraulic motor converts hydraulic power into mechanical energy of rotation, and the generator converts mechanical energy of rotation into electrical energy. This system could be integrated into a lubrication group. However, this would also require incorporating a pump upstream of the hydraulic motor to supply it, and this pump should be supplied with electrical energy. This known system therefore does not solve the problem of supplying electricity from a lubrication group. In addition, the need to install a pump, a hydraulic motor and an electric generator in the lubrication group makes the assembly particularly bulky, expensive and heavy.

Résumé de l'inventionSummary of the invention

Selon un premier aspect, un des buts de l'invention est de fournir un groupe de lubrification équipé d'un générateur électrique bon marché, et dont la présence a peu d'influence sur le volume et le poids du groupe de lubrification.According to a first aspect, one of the aims of the invention is to provide a lubrication group equipped with an inexpensive electric generator, the presence of which has little influence on the volume and the weight of the lubrication group.

A cet effet, l'invention propose une turbomachine d'aéronef selon la revendication 1.To this end, the invention provides an aircraft turbomachine according to claim 1.

Le générateur électrique prévu dans l'invention a une fonction de pompe en plus de sa fonction de génération d'énergie électrique. Il forme donc, en une seule unité, un générateur et une pompe. Lorsqu'il est intégré dans le groupe de lubrification, il peut se substituer à une pompe. Puisque selon l'agencement du générateur électrique, le rotor et le stator sont autour du pignon et de la couronne, le générateur électrique ne prend pas, ou guère, plus de place que la pompe qu'il remplace. Cela le rend particulièrement facile à intégrer dans le groupe de lubrification et cela permet que sa présence n'augmente pas sensiblement le volume ou le poids du groupe de lubrification.The electric generator provided in the invention has a pump function in addition to its function of generating electrical energy. It therefore forms, in a single unit, a generator and a pump. When integrated into the lubrication group, it can replace a pump. Since according to the arrangement of the electric generator, the rotor and the stator are around the pinion and the crown, the electric generator takes up little or no more space than the pump which it replaces. This makes it particularly easy to integrate into the lubrication group and it allows that its presence does not significantly increase the volume or the weight of the lubrication group.

En outre, le générateur électrique prévu dans l'invention est prévu pour être entrainé, via le moyen d'entrainement, par un dispositif mécanique d'entrainement qui peut être un arbre moteur d'une turbomachine comprenant le groupe de lubrification. De cette manière, un mouvement, par exemple une rotation de ce dispositif mécanique d'entrainement entraine une rotation du pignon, qui entraine une rotation de la couronne et ainsi pompe le fluide. En même temps, les aimants du rotor tournent avec la couronne et cette rotation produit de l'énergie électrique dans les bobines du stator. Par conséquent, l'énergie mécanique provenant de la rotation de l'arbre moteur de la turbomachine est convertie en énergie hydraulique et en énergie électrique. Le générateur prévu dans l'invention permet par conséquent l'alimentation de dispositifs électriques auxiliaires, tels des capteurs, présents dans le groupe de lubrification, sans devoir faire appel à des sources électriques extérieures au groupe de lubrification. Cela permet de se passer d'une alimentation en électricité du groupe de lubrification.In addition, the electric generator provided in the invention is intended to be driven, via the drive means, by a mechanical drive device which can be a drive shaft of a turbomachine comprising the lubrication group. In this way, a movement, for example a rotation of this mechanical drive device causes a rotation of the pinion, which causes a rotation of the crown and thus pumps the fluid. At the same time, the rotor magnets rotate with the crown and this rotation produces electrical energy in the stator coils. Consequently, the mechanical energy originating from the rotation of the engine shaft of the turbomachine is converted into hydraulic energy and into electrical energy. The generator provided in the invention therefore allows the supply of auxiliary electrical devices, such as sensors, present in the lubrication group, without having to call on electrical sources external to the lubrication group. This eliminates the need for a power supply to the lubrication group.

La présence du générateur électrique n'entraine pas de forte augmentation de poids du groupe de lubrification puisqu'il n'est guère plus lourd que la pompe qu'il remplace. C'est un avantage important pour un élément de turbomachine d'aéronef.The presence of the electric generator does not cause a large increase in weight of the lubrication group since it is hardly heavier than the pump it replaces. This is an important advantage for an aircraft turbomachine element.

Par rapport à un système comportant une pompe traditionnelle et un générateur électrique traditionnel, le générateur électrique prévu dans l'invention permet une grande simplification de conception puisqu'un seul élément (le générateur électrique prévu dans l'invention) remplace deux éléments (la pompe traditionnelle et le générateur électrique traditionnel). Cela simplifie aussi la maintenance puisqu'une seule dépose est suffisante pour le générateur électrique prévu dans l'invention, au lieu d'une dépose pour une pompe traditionnelle et une dépose pour un générateur électrique traditionnel. En outre, le nombre de pièces est moindre et leur agencement permet une diminution de volume et une diminution de masse par rapport à un système comportant une pompe traditionnelle et un générateur électrique traditionnel. Cela permet que le générateur électrique prévu dans l'invention soit meilleur marché que ce comportant une pompe traditionnelle et un générateur électrique traditionnel.Compared to a system comprising a traditional pump and a traditional electric generator, the electric generator provided in the invention allows a great simplification of design since a single element (the electric generator provided in the invention) replaces two elements (the traditional pump and the traditional electric generator). This also simplifies maintenance since a single removal is sufficient for the electric generator provided in the invention, instead of a removal for a traditional pump and a removal for a traditional electric generator. In addition, the number of parts is less and their arrangement allows a reduction in volume and a reduction in mass compared to a system comprising a traditional pump and a traditional electric generator. This allows the electric generator provided in the invention to be cheaper than that comprising a traditional pump and a traditional electric generator.

Le générateur électrique prélève moins de puissance au dispositif mécanique d'entrainement qu'un système comportant une pompe traditionnelle et un générateur électrique traditionnel car le nombre d'éléments d'entrainement est réduit.The electric generator takes less power from the mechanical drive device than a system comprising a traditional pump and a traditional electric generator because the number of drive elements is reduced.

Le générateur électrique permet de réduire la consommation d'huile par rapport à un système comportant une pompe traditionnelle et un générateur électrique traditionnel car il permet de réduire le nombre de pièces nécessitant une lubrification.The electric generator reduces oil consumption compared to a system comprising a traditional pump and a traditional electric generator because it reduces the number of parts requiring lubrication.

Le générateur électrique prévu dans l'invention peut être appelé "dispositif de générateur-pompe", "générateur-pompe" ou "dynamo-pompe".The electric generator provided in the invention can be called "generator-pump device", "generator-pump" or "dynamo-pump".

Dans un mode de réalisation, le générateur électrique prévu dans l'invention permet de fournir des puissances relativement faibles, de maximum 100 W, qui conviennent pour alimenter des dispositifs électriques auxiliaires tels des capteurs.In one embodiment, the electric generator provided in the invention makes it possible to supply relatively low powers, of maximum 100 W, which are suitable for supplying auxiliary electric devices such as sensors.

Le générateur électrique prévu dans l'invention est entrainé mécaniquement via le moyen d'entrainement et pas hydrauliquement. En effet, un entrainement hydraulique du générateur électrique ferait perdre de l'énergie hydraulique alors que le générateur électrique prévu dans l'invention permet de générer de l'énergie hydraulique.The electric generator provided in the invention is driven mechanically via the drive means and not hydraulically. Indeed, a hydraulic drive of the electric generator would cause hydraulic energy to be lost while the electric generator provided in the invention makes it possible to generate hydraulic energy.

Dans le cadre du présent document un "groupe de lubrification" est un ensemble d'équipements permettant la lubrification.In the context of this document, a "lubrication group" is a set of equipment allowing lubrication.

De préférence, le fluide pompé par la pompe à engrenage interne est un liquide. De préférence, le fluide pompé par la pompe à engrenage interne est un liquide de lubrification, par exemple de l'huile.Preferably, the fluid pumped by the internal gear pump is a liquid. Preferably, the fluid pumped by the internal gear pump is a lubricating liquid, for example oil.

De préférence, le dispositif électrique auxiliaire ne fait pas partie du générateur électrique.Preferably, the auxiliary electrical device is not part of the electrical generator.

Dans le cadre du présent document, un couplage mécanique peut être par exemple une fixation directe (c'est-à-dire sans élément intermédiaire) ou une fixation indirecte (c'est-à-dire via au moins un élément intermédiaire). Un couplage mécanique peut être permanent ou temporaire. Un couplage mécanique peut être fixe ou permettre aux éléments couplés mécaniquement de se mouvoir l'un par rapport à l'autre.In the context of this document, a mechanical coupling can be for example a direct attachment (that is to say without an intermediate element) or an indirect attachment (that is to say via at least one intermediate element). Mechanical coupling can be permanent or temporary. Mechanical coupling can be fixed or allow the mechanically coupled elements to move relative to each other.

Dans le cadre du présent document, un entrainement peut être par exemple un entrainement direct (c'est-à-dire sans élément intermédiaire) ou un entrainement indirect (c'est-à-dire via au moins un élément intermédiaire).In the context of this document, a drive can be for example a direct drive (that is to say without an intermediate element) or an indirect drive (that is to say via at least one intermediate element).

Dans le cadre du présent document, un "dispositif électrique auxiliaire" est un dispositif électrique qui nécessite une alimentation en électricité. De préférence le dispositif électrique auxiliaire demande une puissance électrique relativement faible, par exemple de 0,1 à 100 W. Il est de préférence inclus dans un groupe de lubrification comprenant le générateur électrique. Le dispositif électrique auxiliaire peut être par exemple un capteur de niveau d'huile, un capteur de degré de détérioration de l'huile ou un détecteur de particules dans l'huile. Le dispositif électrique auxiliaire peut être en-dehors du groupe de lubrification comprenant le générateur électrique. Dans le cas où groupe de lubrification comprenant le générateur électrique est intégré dans une turbomachine d'aéronef, le dispositif électrique auxiliaire peut faire partie d'un système d'injection de la turbomachine, d'un système de communication avec une cabine de l'aéronef ou d'un système FADEC de l'aéronef.For the purposes of this document, an "auxiliary electrical device" is an electrical device that requires a supply of electricity. Preferably the auxiliary electrical device requires a relatively low electrical power, for example from 0.1 to 100 W. It is preferably included in a lubrication group comprising the electric generator. The auxiliary electrical device may for example be an oil level sensor, an oil deterioration degree sensor or a particle in oil detector. The auxiliary electrical device can be outside the lubrication group comprising the electric generator. In the case where a lubrication group comprising the electric generator is integrated in an aircraft turbomachine, the auxiliary electric device can be part of a system for injecting the turbomachine, a communication system with an aircraft cabin or an aircraft FADEC system.

Le groupe de lubrification comprend en outre le dispositif électrique auxiliaire qui est connecté électriquement au générateur électrique via le moyen de connexion électrique.The lubrication group further comprises the auxiliary electrical device which is electrically connected to the electric generator via the electrical connection means.

Dans un tel groupe de lubrification, le dispositif électrique compris dans le groupe de lubrification est directement alimenté par une source électrique du groupe de lubrification. Cela permet une génération locale de l'électricité nécessaire au dispositif électrique auxiliaire. Cela évite un câblage électrique entrant ou sortant du groupe de lubrification. Cela permet aussi au fabricant du groupe de lubrification d'adapter directement les spécifications du générateur électrique à celles du ou des dispositif(s) électrique(s) auxiliaire(s). Le dispositif électrique auxiliaire peut par exemple être un capteur comme un capteur de niveau d'huile dans le groupe de lubrification ou un détecteur de particules dans le liquide de lubrification.In such a lubrication group, the electrical device included in the lubrication group is directly supplied by an electrical source from the lubrication group. This allows local generation of the electricity necessary for the auxiliary electrical device. This avoids electrical wiring entering or leaving the lubrication group. This also allows the manufacturer of the lubrication group to directly adapt the specifications of the electric generator to those of the auxiliary electric device (s). The auxiliary electrical device can for example be a sensor such as an oil level sensor in the lubrication group or a particle detector in the lubrication liquid.

Selon un mode de réalisation possible de l'invention, le moyen d'entrainement est fixé au pignon.According to a possible embodiment of the invention, the drive means is fixed to the pinion.

Selon un mode de réalisation possible de l'invention, le moyen d'entrainement comprend un arbre de pignon.According to a possible embodiment of the invention, the drive means comprises a pinion shaft.

L'arbre de pignon est de préférence dans l'axe de rotation du pignon.The pinion shaft is preferably in the axis of rotation of the pinion.

Selon un mode de réalisation possible de l'invention, l'arbre de pignon comprend des dents d'engrènement agencées pour être engrenées par le dispositif mécanique d'entrainement.According to a possible embodiment of the invention, the pinion shaft comprises meshing teeth arranged to be meshed by the mechanical drive device.

Selon un mode de réalisation possible de l'invention, le moyen de connexion électrique comprend un fil électrique ou une pluralité de fils électriques.According to a possible embodiment of the invention, the electrical connection means comprises an electrical wire or a plurality of electrical wires.

Selon un mode de réalisation possible de l'invention, le générateur électrique comprend une connexion fluidique entre un espace de pompage situé entre le pignon et la couronne et le rotor, de façon à ce que le rotor soit immergé dans un fluide circulant dans l'espace de pompage.According to a possible embodiment of the invention, the electric generator comprises a fluid connection between a space pump located between the pinion and the crown and the rotor, so that the rotor is immersed in a fluid circulating in the pumping space.

Cela assure la lubrification du rotor si le fluide pompé est de un liquide de lubrification.This provides lubrication of the rotor if the fluid being pumped is a lubricating fluid.

Selon un mode de réalisation possible de l'invention, le générateur électrique comprend une chemise d'étanchéité située entre le rotor et le stator.According to a possible embodiment of the invention, the electric generator comprises a sealing jacket located between the rotor and the stator.

La chemise d'étanchéité est un moyen de blocage de fluide. La chemise d'étanchéité est permet d'empêcher le fluide circulant dans la pompe, et en particulier dans l'espace de pompage, de rejoindre le stator. En effet, ce fluide pourrait endommager les bobines du stator. La chemise d'étanchéité est préférentiellement un élément essentiellement cylindrique imperméable au fluide pompé. Elle peut être appelée "chemise statorique". La chemise d'étanchéité est de préférence dans un matériau électriquement isolant pour qu'elle ne perturbe pas le signal magnétique entre le rotor et le stator.The sealing jacket is a means of blocking fluid. The sealing jacket is used to prevent the fluid circulating in the pump, and in particular in the pumping space, from reaching the stator. This fluid could damage the stator coils. The sealing jacket is preferably an essentially cylindrical element impermeable to the pumped fluid. It can be called "stator shirt". The sealing jacket is preferably made of an electrically insulating material so that it does not disturb the magnetic signal between the rotor and the stator.

Selon un mode de réalisation possible de l'invention, la chemise d'étanchéité est agencée pour servir de palier pour le rotor.According to a possible embodiment of the invention, the sealing jacket is arranged to serve as a bearing for the rotor.

La distance entre la chemise d'étanchéité et le rotor est préférentiellement choisie pour qu'un film de liquide de lubrification se forme entre les deux, de façon à permettre une rotation douce et régulière du rotor alors que le stator reste immobile. Ce palier peut être considéré comme un palier hydraulique ou hydrodynamique.The distance between the sealing jacket and the rotor is preferably chosen so that a film of lubrication liquid is formed between the two, so as to allow a smooth and regular rotation of the rotor while the stator remains stationary. This bearing can be considered as a hydraulic or hydrodynamic bearing.

Selon un mode de réalisation possible de l'invention, le générateur électrique comprend un moyen d'interruption permettant d'interrompre le transfert d'énergie électrique tout en maintenant les rotations du pignon et de la couronne.According to a possible embodiment of the invention, the electric generator comprises an interruption means making it possible to interrupt the transfer of electric energy while maintaining the rotations of the pinion and the crown.

Le moyen d'interruption peut interrompre la génération d'énergie électrique ou il peut interrompre le transfert d'énergie électrique vers le dispositif électrique auxiliaire. Le moyen d'interruption est de préférence situé sur le moyen de connexion électrique. Cela peut par exemple être un interrupteur situé sur le moyen de connexion électrique.The interrupting means can interrupt the generation of electrical energy or it can interrupt the transfer of electrical energy to the auxiliary electrical device. The interrupting means is preferably located on the electrical connection means. This can for example be a switch located on the electrical connection means.

Selon un mode de réalisation possible de l'invention, le générateur électrique comprend un carter dont une surface intérieure définit une cavité dans laquelle sont situés le pignon, la couronne, le rotor et le stator, le stator étant couplé mécaniquement à ladite surface intérieure et le carter étant percé d'une première ouverture faisant partie de l'entrée fluidique, d'une deuxième ouverture faisant partie de la sortie fluidique et d'une troisième ouverture pour le moyen d'entrainement.According to a possible embodiment of the invention, the electric generator comprises a casing, an interior surface of which defines a cavity in which the pinion, the crown, the rotor and the stator are located, the stator being mechanically coupled to said interior surface and the casing being pierced with a first opening forming part of the fluid inlet, a second opening forming part of the fluid outlet and a third opening for the drive means.

Le carter permet une bonne protection du générateur électrique. Les bobines du stator sont de préférence couplées mécaniquement au carter afin de gagner de la place et de réduire le nombre de pièces du générateur électrique. De préférence, le carter comprend une quatrième ouverture pour le moyen de connexion électrique.The casing provides good protection for the electric generator. The stator coils are preferably mechanically coupled to the housing in order to save space and reduce the number of parts of the electric generator. Preferably, the casing includes a fourth opening for the electrical connection means.

Selon un mode de réalisation possible de l'invention, les entrée et sortie fluidiques ont une direction ayant une composante parallèle à l'axe de rotation de la couronne.According to a possible embodiment of the invention, the fluid inlet and outlet have a direction having a component parallel to the axis of rotation of the crown.

En effet, à cause des bobines, il est préférables que ces entrée et sortie ne soient pas radiales, mais aient une direction ayant une composante axiale ou aient une direction axiale. De préférence, les entrée et sortie de fluide sont essentiellement parallèles à l'axe de rotation de la couronne.Indeed, because of the coils, it is preferable that these input and output are not radial, but have a direction having an axial component or have an axial direction. Preferably, the fluid inlet and outlet are essentially parallel to the axis of rotation of the crown.

La turbomachine selon l'invention est particulièrement intéressante car elle permet une récupération d'une partie de l'énergie de rotation de l'arbre moteur en énergie électrique et pompage.The turbomachine according to the invention is particularly advantageous because it allows a recovery of part of the rotational energy of the motor shaft into electrical energy and pumping.

Le générateur électrique fait de préférence partie d'un groupe de lubrification de la turbomachine. En outre, le dispositif électrique auxiliaire fait partie du même groupe de lubrification.The electric generator is preferably part of a lubrication group of the turbomachine. In addition, the auxiliary electrical device is part of the same lubrication group.

Selon un mode de réalisation de l'invention, le dispositif mécanique d'entrainement comprend en outre une boite de réduction et/ou des engrenages couplant mécaniquement l'arbre moteur au moyen d'entrainement.According to one embodiment of the invention, the mechanical drive device further comprises a reduction box and / or gears mechanically coupling the drive shaft to the drive means.

Selon un mode de réalisation de l'invention, le dispositif électrique auxiliaire fait partie d'un système d'injection de la turbomachine, d'un système de communication avec une cabine de l'aéronef ou d'un système FADEC de l'aéronef.According to one embodiment of the invention, the auxiliary electrical device is part of a turbomachine injection system, of a communication system with an aircraft cabin or of an FADEC system of the aircraft .

Par exemple, la turbomachine peut comprendre un système d'injection comprenant le dispositif électrique auxiliaire alimenté par le générateur. Il est aussi possible que la turbomachine soit en communication avec la cabine de l'aéronef grâce au dispositif électrique auxiliaire afin qu'un échange d'informations puisse être réalisé entre la cabine de l'aéronef et la turbomachine. Il est aussi possible que le dispositif électrique auxiliaire comprenne une partie d'un système FADEC installée dans la turbomachine.For example, the turbomachine may include an injection system comprising the auxiliary electrical device supplied by the generator. It is also possible that the turbomachine is in communication with the cabin of the aircraft thanks to the auxiliary electrical device so that an exchange of information can be carried out between the cabin of the aircraft and the turbomachine. It is also possible that the auxiliary electrical device includes a part of a FADEC system installed in the turbomachine.

Selon un deuxième aspect, l'invention propose une méthode de conversion d'énergie mécanique en énergie hydraulique et énergie électrique selon la revendication 13.According to a second aspect, the invention provides a method of converting mechanical energy into hydraulic energy and electrical energy according to claim 13.

Les avantages mentionnés pour le dispositif s'appliquent mutatis mutandis à la méthode.The advantages mentioned for the device apply mutatis mutandis to the method.

Brève description des figuresBrief description of the figures

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux figures annexées parmi lesquelles :

  • la figure 1 est une vue éclatée d'un générateur électrique prévu dans un mode de réalisation de l'invention, et
  • la figure 2 est une vue en coupe d'un générateur électrique prévu dans un mode de réalisation de l'invention.
Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended figures among which:
  • the figure 1 is an exploded view of an electric generator provided in an embodiment of the invention, and
  • the figure 2 is a sectional view of an electric generator provided in an embodiment of the invention.

Modes de réalisation de l'inventionModes of Carrying Out the Invention

La présente invention est décrite avec des réalisations particulières et des références à des figures mais l'invention n'est pas limitée par celles-ci. Les dessins ou figures décrits ne sont que schématiques et ne sont pas limitants.The present invention is described with particular embodiments and references to figures, but the invention is not limited by these. The drawings or figures described are only schematic and are not limiting.

Dans le contexte du présent document, les termes « premier » et « deuxième » servent uniquement à différencier les différents éléments et n'impliquent pas d'ordre entre ces éléments.In the context of this document, the terms "first" and "second" serve only to differentiate between the different elements and do not imply an order between them.

Sur les figures, les éléments identiques ou analogues peuvent porter les mêmes références.In the figures, identical or similar elements may bear the same references.

La figure 1 est une vue éclatée d'un générateur électrique 1 prévu dans un mode de réalisation de l'invention. Le générateur électrique comprend un pignon 11, une couronne 12 agencée autour du pignon 11 et un moyen d'entrainement couplé mécaniquement au pignon 11. Le moyen d'entrainement est prévu pour fournir au pignon 11 une énergie mécanique provenant d'un dispositif mécanique d'entrainement extérieur au générateur électrique 1. Selon un mode de réalisation, la couronne 12 et le pignon 11 ont des axes de rotation parallèles et décalés l'un par rapport à l'autre.The figure 1 is an exploded view of an electric generator 1 provided in an embodiment of the invention. The electric generator comprises a pinion 11, a crown 12 arranged around the pinion 11 and a drive means mechanically coupled to the pinion 11. The drive means is provided to supply the pinion 11 with mechanical energy from a mechanical device d drive outside the electric generator 1. According to one embodiment, the ring gear 12 and the pinion 11 have axes of rotation parallel and offset with respect to each other.

Dans un mode de réalisation, le moyen d'entrainement est fixé à une surface du pignon 11 perpendiculaire à l'axe de rotation du pignon 11. De préférence, le moyen d'entrainement comprend un arbre de pignon 23. L'arbre de pignon 23 peut comprendre des dents d'engrènement 24 agencées pour être engrenées par le dispositif mécanique d'entrainement.In one embodiment, the drive means is fixed to a surface of the pinion 11 perpendicular to the axis of rotation of the pinion 11. Preferably, the drive means comprises a pinion shaft 23. The pinion shaft 23 may include meshing teeth 24 arranged to be meshed by the mechanical drive device.

Le pignon 11 et la couronne 12 forment une pompe à engrenage interne qui est comprise dans le générateur électrique 1. Dans la pompe à engrenage interne, la couronne 12 est entrainée mécaniquement par le pignon 11. Le pignon 11 présente des dents sur une surface extérieure qui sont engrenées avec des dents que la couronne 12 présente sur une surface intérieure. L'espace situé entre le pignon 11 et la couronne 12 est appelé espace de pompage 6 (visible figure 2). L'espace de pompage 6 comprend un premier espace, ou espace basse pression, sur lequel débouche une entrée fluidique du générateur électrique 1, et un deuxième espace, ou espace haute pression, sur lequel débouche une sortie fluidique du générateur électrique 1. Les rotations du pignon 11 et de la couronne 12 ont pour effet de déplacer un fluide depuis l'espace basse pression vers l'espace haute pression en le compressant. Le fluide sortant par la sortie fluidique est ainsi à une plus haute pression que le fluide entrant par l'entrée fluidique.The pinion 11 and the crown 12 form an internal gear pump which is included in the electric generator 1. In the internal gear pump, the crown 12 is mechanically driven by the pinion 11. The pinion 11 has teeth on an outer surface which are meshed with teeth that the crown 12 has on an inner surface. The space between the pinion 11 and the crown 12 is called the pumping space 6 (visible figure 2 ). Space pumping 6 comprises a first space, or low pressure space, on which opens a fluid inlet of the electric generator 1, and a second space, or high pressure space, on which opens a fluid outlet of the electric generator 1. The rotations of the pinion 11 and crown 12 have the effect of displacing a fluid from the low pressure space to the high pressure space by compressing it. The fluid leaving through the fluid outlet is thus at a higher pressure than the fluid entering through the fluid inlet.

L'entrée fluidique forme une première connexion fluidique entre l'espace basse pression et une première conduite fluidique qui permet d'amener le fluide à la pompe à engrenage interne depuis un premier équipement extérieur au générateur électrique 1. La sortie fluidique forme une deuxième connexion fluidique entre l'espace haute pression et une deuxième conduite fluidique qui permet de faire sortir le fluide de la pompe à engrenage interne pour amener le fluide à un deuxième équipement extérieur au générateur électrique 1. La première et la deuxième conduites fluidiques sont de préférence partie d'un groupe de lubrification comprenant le générateur électrique 1.The fluid inlet forms a first fluid connection between the low pressure space and a first fluid line which makes it possible to supply the fluid to the internal gear pump from a first piece of equipment external to the electric generator 1. The fluid outlet forms a second connection fluid between the high pressure space and a second fluid line which allows the fluid to exit the internal gear pump to bring the fluid to a second equipment external to the electric generator 1. The first and second fluid lines are preferably part a lubrication group comprising the electric generator 1.

Le générateur électrique 1 comprend aussi un rotor 13 comprenant des aimants 3 et un stator 14 situé autour du rotor 13. Les aimants 3 sont couplés mécaniquement à la couronne 12 de façon à ce que l'ensemble des aimants 3 tourne avec la couronne 12. Les aimants 3 sont de préférence fixés à la couronne 12. Les aimants 3 sont de préférence des aimants permanents. Dans un mode de réalisation, le rotor 13 comprend un support pour aimant 18 couplant mécaniquement les aimants 3 à la couronne 12. Optionnellement, le rotor 13 peut comprendre une frette 19 permettant d'augmenter sa solidité. Le stator 14 comprend des bobines conductrices agencées pour que la rotation du rotor 13 y génère une énergie électrique. Dans un mode de réalisation, le rotor 13 et le stator 14 sont configurés en cage d'écureuil.The electric generator 1 also comprises a rotor 13 comprising magnets 3 and a stator 14 situated around the rotor 13. The magnets 3 are mechanically coupled to the crown 12 so that all of the magnets 3 rotate with the crown 12. The magnets 3 are preferably fixed to the crown 12. The magnets 3 are preferably permanent magnets. In one embodiment, the rotor 13 comprises a magnet support 18 mechanically coupling the magnets 3 to the crown 12. Optionally, the rotor 13 can comprise a hoop 19 making it possible to increase its solidity. The stator 14 comprises conductive coils arranged so that the rotation of the rotor 13 generates electrical energy there. In one embodiment, the rotor 13 and the stator 14 are configured in a squirrel cage.

Le générateur électrique 1 comprend aussi un moyen de connexion électrique (non-représenté) connecté électriquement aux bobines du stator 14 et permettant de transférer l'énergie électrique générée dans les bobines à un ou plusieurs dispositif(s) électrique(s) auxiliaire(s). De préférence, le moyen de connexion électrique comprend un fil électrique ou une pluralité de fils électriques. Le moyen de connexion électrique permet un couplage électrique ou électromagnétique entre les bobines et le dispositif électrique auxiliaire. Le moyen de connexion permet ainsi de fournir de l'électricité au dispositif électrique auxiliaire. Le dispositif électrique auxiliaire fait de préférence partie d'un groupe de lubrification dans lequel le générateur électrique 1 est intégré. Le dispositif électrique auxiliaire fait de préférence partie d'une turbomachine dans laquelle le générateur électrique 1 est intégré.The electrical generator 1 also comprises an electrical connection means (not shown) electrically connected to the coils of the stator 14 and making it possible to transfer the electrical energy generated in the coils to one or more auxiliary electrical device (s) ). Preferably, the electrical connection means comprises an electrical wire or a plurality of electrical wires. The electrical connection means allows electrical or electromagnetic coupling between the coils and the auxiliary electrical device. The connection means thus makes it possible to supply electricity to the auxiliary electrical device. The auxiliary electrical device is preferably part of a lubrication group in which the electric generator 1 is integrated. The auxiliary electrical device is preferably part of a turbomachine in which the electric generator 1 is integrated.

Dans un mode de réalisation, le générateur électrique 1 comprend un moyen d'interruption agencé pour interrompre la fourniture d'énergie électrique par le générateur électrique 1 tout en maintenant les rotations du pignon 11 et de la couronne 12, de façon à continuer la compression fluidique fournie par le générateur électrique 1.In one embodiment, the electric generator 1 comprises an interruption means arranged to interrupt the supply of electric energy by the electric generator 1 while maintaining the rotations of the pinion 11 and the crown 12, so as to continue the compression fluid supplied by the electric generator 1.

Le générateur électrique 1 est de préférence agencé pour que la puissance électrique qu'il génère soit de 0,1 à 100 W, plus préférentiellement entre 1 et 50 W, encore plus préférentiellement entre 2 et 10 W. Cela correspond aux puissances généralement demandées par des dispositifs électriques auxiliaires tels des capteurs.The electric generator 1 is preferably arranged so that the electric power that it generates is from 0.1 to 100 W, more preferably between 1 and 50 W, even more preferably between 2 and 10 W. This corresponds to the powers generally required by auxiliary electrical devices such as sensors.

Le générateur électrique 1 est de préférence agencé pour que le voltage électrique qu'il génère soit de 1 mV à 10 V, plus préférentiellement de 10 mV à 1 V. Cela correspond aux voltages généralement demandés par des dispositifs électriques auxiliaires tels des capteurs.The electric generator 1 is preferably arranged so that the electric voltage which it generates is from 1 mV to 10 V, more preferably from 10 mV to 1 V. This corresponds to the voltages generally required by auxiliary electric devices such as sensors.

Le générateur électrique 1 est préférentiellement compris dans un groupe de lubrification. Préférentiellement, le groupe de lubrification est compris dans une turbomachine. Le dispositif mécanique d'entrainement est de préférence compris dans la turbomachine ou dans le groupe de lubrification. Selon un mode de réalisation, le dispositif mécanique d'entrainement comprend un arbre moteur de la turbomachine. Selon un mode de réalisation, le dispositif mécanique d'entrainement comprend une boite de réduction. L'arbre moteur peut être connecté mécaniquement en rotation avec la boite de de réduction, par exemple par un engrenage, et la boite de réduction peut être connectée mécaniquement au moyen d'entrainement du générateur électrique 1, par exemple par un engrenage. Ainsi, la rotation de l'arbre moteur entraine la rotation du pignon 11.The electric generator 1 is preferably included in a lubrication group. Preferably, the lubrication group is included in a turbomachine. The mechanical drive device is preferably included in the turbomachine or in the lubrication group. According to one embodiment, the mechanical drive device comprises a drive shaft of the turbomachine. According to one embodiment, the mechanical drive device comprises a reduction box. The motor shaft can be mechanically connected in rotation with the reduction box, for example by a gear, and the reduction box can be mechanically connected by means of drive of the electric generator 1, for example by a gear. Thus, the rotation of the motor shaft causes the rotation of the pinion 11.

Dans un mode de réalisation, le générateur électrique 1 est agencé pour qu'il existe une connexion fluidique entre l'espace de pompage 6 est le rotor 13 afin que le rotor 13 soit immergé dans le fluide. Cela permet d'assurer une bonne lubrification du rotor 13. La communication fluidique peut par exemple se faire via un espace de jeu entre la couronne 12 et des éléments adjacents à la couronne 12 et décalés axialement par rapport à la couronne 12.In one embodiment, the electric generator 1 is arranged so that there is a fluid connection between the pumping space 6 and the rotor 13 so that the rotor 13 is immersed in the fluid. This ensures good lubrication of the rotor 13. Fluid communication can for example be carried out via a clearance space between the ring 12 and elements adjacent to the ring 12 and offset axially relative to the ring 12.

Dans un mode de réalisation, le générateur électrique 1 comprend une chemise d'étanchéité 15 entre le rotor 13 et le stator 14 pour empêcher le fluide pompé par la pompe à engrenage interne d'entrer en contact avec le stator 14.In one embodiment, the electric generator 1 comprises a sealing jacket 15 between the rotor 13 and the stator 14 to prevent the fluid pumped by the internal gear pump from coming into contact with the stator 14.

Dans un mode de réalisation, la chemise d'étanchéité 15 sert de pallier au rotor 13. Par exemple, le rotor 13 et la surface intérieure de la chemise d'étanchéité 15 peuvent être en contact fluidique avec l'espace de pompage 6, ce qui permet au fluide de baigner le rotor 13 et de créer un film lubrifiant entre le rotor 13 et la surface intérieure de la chemise d'étanchéité 15 pour que la chemise d'étanchéité 15 serve de pallier lisse au rotor 13.In one embodiment, the sealing jacket 15 serves to compensate for the rotor 13. For example, the rotor 13 and the inner surface of the sealing jacket 15 can be in fluid contact with the pumping space 6, this which allows the fluid to bathe the rotor 13 and to create a lubricating film between the rotor 13 and the inner surface of the sealing jacket 15 so that the sealing jacket 15 serves to smoothly compensate the rotor 13.

La figure 2 est une vue en coupe du générateur électrique 1 prévu dans un mode de réalisation de l'invention. La figure 2 illustre un carter 16 du générateur électrique 1. Le carter 16 a une surface intérieure 17. La surface intérieure 17 a de préférence une partie cylindrique ayant pour axe de révolution l'axe de rotation de la couronne 12. La surface intérieure 17 de préférence deux parties d'extrémité (non-représentées) aux extrémités de la partie cylindrique. Les parties d'extrémité peuvent être essentiellement planes.The figure 2 is a sectional view of the electric generator 1 provided in an embodiment of the invention. The figure 2 illustrates a casing 16 of the electric generator 1. The casing 16 has an interior surface 17. The internal surface 17 preferably has a cylindrical part having as its axis of revolution the axis of rotation of the crown 12. The internal surface 17 preferably has two end parts (not shown) at the ends of the cylindrical part. The end portions may be essentially planar.

La surface intérieure 17 définit une cavité dans laquelle sont situés le pignon 11, la couronne 12, le rotor 13 et le stator 14. Dans un mode de réalisation, les bobines du stator 14 sont fixées à la surface intérieure 17.The internal surface 17 defines a cavity in which the pinion 11, the crown 12, the rotor 13 and the stator 14 are located. In one embodiment, the coils of the stator 14 are fixed to the internal surface 17.

Le carter 16 a de préférence une première ouverture pour l'entrée du fluide dans l'espace de pompage 6. Cette première ouverture fait partie de l'entrée fluidique du générateur électrique 1. La première ouverture a de préférence une direction ayant une composante parallèle à l'axe de rotation de la couronne 12. Autrement dit, la première ouverture est au moins partiellement axiale. Cela permet de simplifier l'agencement du générateur. Par exemple, la première ouverture peut être dans une des parties d'extrémité de la surface intérieure 17.The casing 16 preferably has a first opening for the entry of the fluid into the pumping space 6. This first opening forms part of the fluid inlet of the electric generator 1. The first opening preferably has a direction having a parallel component to the axis of rotation of the crown 12. In other words, the first opening is at least partially axial. This simplifies the arrangement of the generator. For example, the first opening may be in one of the end portions of the interior surface 17.

Le carter 16 a de préférence une deuxième ouverture pour la sortie du fluide de l'espace de pompage 6. Cette deuxième ouverture fait partie de la sortie fluidique du générateur électrique 1. La deuxième ouverture a de préférence une direction ayant une composante parallèle à l'axe de rotation de la couronne 12. Autrement dit, la deuxième ouverture est au moins partiellement axiale. Cela permet de simplifier l'agencement du générateur. Par exemple, la deuxième ouverture peut être dans une des parties d'extrémité de la surface intérieure 17.The casing 16 preferably has a second opening for the outlet of the fluid from the pumping space 6. This second opening forms part of the fluid outlet of the electric generator 1. The second opening preferably has a direction having a component parallel to the 'axis of rotation of the crown 12. In other words, the second opening is at least partially axial. This simplifies the arrangement of the generator. For example, the second opening may be in one of the end portions of the interior surface 17.

Le carter 16 a de préférence une troisième ouverture pour le passage du moyen d'entrainement. La troisième ouverture est de préférence dans la continuation de l'axe de rotation du pignon 11. Par exemple, la troisième ouverture peut être dans une des parties d'extrémité de la surface intérieure 17. La troisième ouverture peut être agencée pour laisser passer l'arbre de pignon 23. Les dents d'engrènement de l'arbre de pignon 23 sont de préférence à l'extérieur du carter 16.The casing 16 preferably has a third opening for the passage of the drive means. The third opening is preferably in the continuation of the axis of rotation of the pinion 11. For example, the third opening can be in one of the end portions of the interior surface 17. The third opening can be arranged to allow the pinion shaft 23 to pass through. The meshing teeth of the pinion shaft 23 are preferably outside the casing 16.

Le carter 16 a de préférence une quatrième ouverture pour le passage du moyen de connexion électrique.The casing 16 preferably has a fourth opening for the passage of the electrical connection means.

En d'autres termes, l'invention se rapporte à une turbomachine d'aéronef comprenant un dispositif de générateur-pompe intégrant une pompe et un générateur électrique dans un volume particulièrement réduit. Une rotation d'un arbre de pignon 23 entraine une rotation d'un pignon 11 qui entraine une rotation d'une couronne 12. Les rotations du pignon 11 et de la couronne 12 créent un pompage de fluide d'une entrée fluidique vers une sortie fluidique du dispositif. Des aimants 3 sont fixés sur la couronne 12 de façon à former un rotor 13. La rotation de ce rotor 13 par rapport à un stator 14 entraine une production d'énergie électrique.In other words, the invention relates to an aircraft turbomachine comprising a generator-pump device integrating a pump and an electric generator in a particularly reduced volume. A rotation of a pinion shaft 23 causes a rotation of a pinion 11 which causes a rotation of a crown 12. The rotations of the pinion 11 and of the crown 12 create a pumping of fluid from a fluid inlet towards an outlet fluidics of the device. Magnets 3 are fixed on the crown 12 so as to form a rotor 13. The rotation of this rotor 13 relative to a stator 14 results in the production of electrical energy.

La présente invention a été décrite en relation avec des modes de réalisations spécifiques, qui ont une valeur purement illustrative et ne doivent pas être considérés comme limitatifs. D'une manière générale, la présente invention n'est pas limitée aux exemples illustrés et/ou décrits ci-dessus. L'usage des verbes « comprendre », « inclure », « comporter », ou toute autre variante, ainsi que leurs conjugaisons, ne peut en aucune façon exclure la présence d'éléments autres que ceux mentionnés. L'usage de l'article indéfini « un », « une », ou de l'article défini « le », « la » ou « l' », pour introduire un élément n'exclut pas la présence d'une pluralité de ces éléments. Les numéros de référence dans les revendications ne limitent pas leur portée.The present invention has been described in relation to specific embodiments, which have a purely illustrative value and should not be considered as limiting. In general, the present invention is not limited to the examples illustrated and / or described above. The use of the verbs "to understand", "to include", "to include", or any other variant, as well as their conjugations, cannot in any way exclude the presence of elements other than those mentioned. The use of the indefinite article "a", "an", or of the definite article "the", "the" or "the", to introduce an element does not exclude the presence of a plurality of these elements. Reference numbers in the claims do not limit their scope.

Claims (13)

  1. Aircraft turbine engine comprising
    - a mechanical drive device comprising a drive shaft; and
    - a lubrication unit comprising an auxiliary electrical device and an electrical generator (1) intended to supply the auxiliary electrical device with electricity, the electrical generator (1) comprising:
    • a pinion (11),
    • a drive means mechanically coupled with the pinion (11) so as to drive the pinion (11) in rotation, and mechanically coupled with the mechanical drive device, so that the mechanical drive device can drive the pinion (11) in rotation via said drive means,
    • a ring (12) arranged around the pinion (11) to be able to be driven in rotation by the pinion (11) so as to form an inner gear pump with the pinion (11),
    • a fluid inlet making it possible to supply the inner gear pump with fluid from the outside of the electrical generator (1),
    • a fluid outlet making it possible to make the fluid exit from the inner gear pump outwards from the electrical generator (1),
    • magnets (3) mechanically coupled with the ring (12) so as to rotate with it to form a rotor (13),
    • a stator (14) arranged around the rotor (13) and comprising coils such that a rotation of the rotor (13) generates an electrical energy in said coils, and
    • an electrical connection means electrically connected to the coils and to the auxiliary electrical device and arranged to transfer an electrical energy generated in said coils to the auxiliary electrical device,
    such that the electrical generator (1) is capable of compressing a fluid and of generating electrical energy when the pinion (11) is driven in rotation by the drive means.
  2. Aircraft turbine engine according to claim 1, characterised in that the auxiliary electrical device comprises a sensor, for example an oil level sensor in the lubrication unit or a particle detector in a lubrication liquid circulating in the lubrication unit.
  3. Aircraft turbine engine according to any one of the preceding claims, characterised in that the drive means is fixed to the pinion (11).
  4. Aircraft turbine engine according to the preceding claim, characterised in that the drive means comprises a pinion shaft (23).
  5. Aircraft turbine engine according to the preceding claim, characterised in that the pinion shaft (23) comprises gear teeth (24) arranged to be meshed by the mechanical drive device.
  6. Aircraft turbine engine according to any one of the preceding claims, characterised in that the electrical generator (1) comprises a fluid connection between a pumping space (6) situated between the pinion (11) and the ring (12) and the rotor (13), so that the rotor (13) is immersed in a fluid circulating in the pumping space (6).
  7. Aircraft turbine engine according to any one of the preceding claims, characterised in that the electrical generator (1) further comprises a sealing jacket (15) situated between the rotor (13) and the stator (14).
  8. Aircraft turbine engine according to the preceding claim, characterised in that the sealing jacket (15) is arranged to be used as a bearing for the rotor (13).
  9. Aircraft turbine engine according to any one of the preceding claims, further comprising an interruption means making it possible to interrupt the electrical energy transfer while maintaining the rotations of the pinion (11) and of the ring (12).
  10. Aircraft turbine engine according to any one of the preceding claims, characterised in that the electrical generator (1) further comprises a casing (16) of which an inner surface (17) defines a cavity wherein the pinion (11), the ring (12), the rotor (13) and the stator (14) are situated, the stator (14) being mechanically coupled to said inner surface (17) and the casing (16) being bored with a first opening forming part of the fluid inlet, with a second opening forming part of the fluid outlet and with a third opening for the drive means.
  11. Aircraft turbine engine according to any one of the preceding claims, wherein the mechanical drive device further comprises a reduction gear and/or gear casing mechanically coupling the drive shaft to the drive means.
  12. Aircraft turbine engine according to any one of the preceding claims, wherein the auxiliary electrical device forms part of an injection system of the turbine engine, a system for communicating with a cabin of the aircraft or a FADEC system of the aircraft.
  13. Method for converting mechanical energy into hydraulic energy and electrical energy and comprising steps of:
    • supplying an aircraft turbine engine according to any one of the preceding claims,
    • supplying a mechanical energy to the means for driving said electrical generator (1) so as to make the pinion (11) of said electrical generator (1) rotate, such that it drives the ring (12) and the rotor (13) of said electrical generator (1), the rotations of the pinion (11) and of the ring (12) creating a fluid pumping of the fluid inlet to the fluid outlet of said electrical generator (1), and the rotation of the rotor (13) with respect to the stator (14) of said electrical generator (1) generating an electrical energy in the coils of the stator (14).
EP18150265.9A 2017-01-09 2018-01-04 Lubricating unit for an aircraft turbine engine, comprising a dynamo-pump Active EP3346132B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE2017/5005A BE1024886B1 (en) 2017-01-09 2017-01-09 Dynamo pump

Publications (2)

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EP3346132A1 EP3346132A1 (en) 2018-07-11
EP3346132B1 true EP3346132B1 (en) 2020-02-26

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EP18150265.9A Active EP3346132B1 (en) 2017-01-09 2018-01-04 Lubricating unit for an aircraft turbine engine, comprising a dynamo-pump

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EP (1) EP3346132B1 (en)
BE (1) BE1024886B1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USH1966H1 (en) * 1997-08-28 2001-06-05 The United States Of America As Represented By The Secretary Of The Navy Integrated motor/gear pump
US6634866B2 (en) * 2001-08-17 2003-10-21 Borgwarner, Inc. Method and apparatus for providing a hydraulic transmission pump assembly having a one way clutch
DE10214637A1 (en) * 2002-04-02 2003-10-23 Woco Franz Josef Wolf & Co Gmbh Hybrid drive for hybrid pump, especially for motor vehicle, has planetary drive that can be driven by electric motor and/or mechanical drive
US8182235B2 (en) * 2008-11-25 2012-05-22 Toyota Motor Engineering & Manufacturing North America, Inc. Multi-drive fluid pump
US20130336808A1 (en) * 2012-06-08 2013-12-19 Magna Powertrain Of America, Inc. Out rotor drive electrical vane pump
FR3027625B1 (en) * 2014-10-27 2016-12-30 Snecma TURBOMACHINE COMPRISING AN ELECTRIC CURRENT GENERATOR FOR THE INJECTION OF OIL FROM THE INTERIOR OF A TURBINE TREE

Non-Patent Citations (1)

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Title
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EP3346132A1 (en) 2018-07-11
BE1024886A1 (en) 2018-08-03

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