Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02K—JET-PROPULSION PLANTS
  • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
  • F02K1/54—Nozzles having means for reversing jet thrust
  • F02K1/56—Reversing jet main flow
  • F02K1/62—Reversing jet main flow by blocking the rearward discharge by means of flaps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
  • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
  • F01D11/005—Sealing means between non relatively rotating elements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02K—JET-PROPULSION PLANTS
  • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
  • F02K1/54—Nozzles having means for reversing jet thrust
  • F02K1/64—Reversing fan flow
  • F02K1/70—Reversing fan flow using thrust reverser flaps or doors mounted on the fan housing
  • F02K1/72—Reversing fan flow using thrust reverser flaps or doors mounted on the fan housing the aft end of the fan housing being movable to uncover openings in the fan housing for the reversed flow
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02K—JET-PROPULSION PLANTS
  • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
  • F02K1/54—Nozzles having means for reversing jet thrust
  • F02K1/56—Reversing jet main flow
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02K—JET-PROPULSION PLANTS
  • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
  • F02K1/54—Nozzles having means for reversing jet thrust
  • F02K1/56—Reversing jet main flow
  • F02K1/566—Reversing jet main flow by blocking the rearward discharge by means of a translatable member
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02K—JET-PROPULSION PLANTS
  • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
  • F02K1/54—Nozzles having means for reversing jet thrust
  • F02K1/56—Reversing jet main flow
  • F02K1/62—Reversing jet main flow by blocking the rearward discharge by means of flaps
  • F02K1/625—Reversing jet main flow by blocking the rearward discharge by means of flaps the aft end of the engine cowling being movable to uncover openings for the reversed flow
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02K—JET-PROPULSION PLANTS
  • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
  • F02K1/54—Nozzles having means for reversing jet thrust
  • F02K1/76—Control or regulation of thrust reversers
  • F02K1/763—Control or regulation of thrust reversers with actuating systems or actuating devices; Arrangement of actuators for thrust reversers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2240/00—Components
  • F05D2240/55—Seals
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2250/00—Geometry
  • F05D2250/30—Arrangement of components
  • F05D2250/34—Arrangement of components translated
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2250/00—Geometry
  • F05D2250/40—Movement of components
  • F05D2250/41—Movement of components with one degree of freedom

Definitions

• the present invention relates to a thrust reverser grid or cascade for an aircraft turbojet.
• An aircraft is driven by several turbojet engines each housed in a nacelle also housing a set of ancillary actuating devices related to its operation and providing various functions when the turbojet engine is in operation or stopped.
• These ancillary actuating devices comprise in particular a mechanical thrust reversal system.
• a nacelle generally has a tubular structure comprising an air inlet upstream of the turbojet engine, a median section intended to surround a fan of the turbojet engine, a downstream section housing the thrust reversal means and intended to surround the engine room. combustion of the turbojet, and is generally terminated by an ejection nozzle whose output is located downstream of the turbojet engine.
• Modern nacelles are intended to house a turbofan engine capable of generating through the blades of the rotating fan a flow of hot air (also called primary flow) from the combustion chamber of the turbojet engine, and a flow of cold air (secondary flow) flowing outside the turbojet through an annular channel, also called vein, formed between a fairing of the turbojet engine and an inner wall of the nacelle.
• the two air flows are ejected from the turbojet engine from the rear of the nacelle.
• the role of a thrust reverser is, during the landing of an aircraft, to improve the braking capacity thereof by redirecting forward at least a portion of the thrust generated by the turbojet engine.
• the inverter obstructs the annular channel of the cold air flow and directs the latter towards the front of the nacelle, thereby generating a counter-thrust which is added to the braking of the wheels of the aircraft .
• an inverter comprises movable covers moved between, on the one hand, an extended position (or “reverse jet”) in which they open in the nacelle a passage for the deflected flow, and secondly, a retracted position (or “direct jet”) in which they close this passage.
• a gate inverter also known as a cascade inverter
• the reorientation of the air flow is performed by deflection grids, the hood being slidably mounted along the axis of the nacelle. to discover or cover these grills.
• Complementary locking doors also called inversion flaps, activated by the sliding of the cowling, generally allow closure of the annular channel of cold air flow downstream of the grids so as to optimize the reorientation of this air flow.
• these cylinders are fixed upstream on a fixed part of the nacelle, such as the front support frame of the deflection grilles, and downstream inside the movable cowl, through suitable fittings.
• actuating rods of these cylinders pass through the rear support frame of the deflection grids to cooperate with the movable cowl.
• the present invention is thus particularly intended to provide means for reducing the thickness of the rear support frame of the deflection grids.
• a cover mounted sliding between a direct jet position in which it covers said grids and a reverse jet position in which it discovers these grids, this cover comprising a substantially annular diaphragm coming to be placed edge to edge with said front frame and radially to inside said grids when said hood is in the direct jet position, - Reversing thrust flaps mounted pivoting on the diaphragm led between a jet position d irect in which they allow the circulation of cold air downstream of the inverter, and a reverse jet position in which they direct this cold air towards said grids, and
• the cylinders do not have to go through the rear support frame of the deflection grids, since the diaphragm is located radially inside (that is to say under) this frame.
• the arrangement according to the invention is also suitable when the reversing gates are self-supporting, that is to say when there is no rear frame, and the gates are only fixed between them and on the front frame.
• said cylinders are located under said grids
• said cylinders are located between said grids;
• said diaphragm comprises an upstream edge folded towards the inside of the nacelle, supporting fittings for fixing the downstream ends of said jacks;
• said upstream edge also supports a seal capable of being pressed against said front frame when said movable cowling is in the direct jet position advantageously under the jack;
• said front frame comprises an annular groove provided with a seal, and the upstream edge of said diaphragm comprises a skirt adapted to fit in this groove when said movable cover is in a direct jet position;
• the present invention also relates to a nacelle incorporating a thrust reverser according to the above.
• FIG. 1 shows, in axial section, the zone of the inversion gates of a thrust reverser according to the invention, when this inverter is in the direct jet position;
• FIG. 2 represents this inverter in reverse jet position
• FIG. 3 represents another mode of realisation of this inverter according to the invention, in the direct jet (continuous lines) and reverse jet (dotted line) positions respectively, and
• FIG. 4 shows yet another embodiment of the inverter according to the invention, in the reverse jet position.
• This thrust reverser comprises a plurality of deflection grids 7, fixed between a front frame 9 and a fixed rear frame 1 1.
• Actuation of the movable cowl 13 between these two positions is effected by a plurality of jacks 19 disposed at the periphery of the nacelle, and whose body 21 is fixed upstream of the front frame 9, and whose actuating rod 23 co-operates with the inner diaphragm 17 via a fitting 25.
• the inner diaphragm 17 comprises, in its upstream part, an edge 27 folded towards the inside of the nacelle, that is to say in the direction of the axis A of this nacelle.
• the upstream edge 27 of the diaphragm 17 supports a seal 29 adapted to be pressed against the front frame 9 when the movable cover 13 is in the direct jet position, as shown in FIG.
• a plurality of thrust reverser flaps 31 are moreover pivotally mounted on the diaphragm 17, between a direct jet position (FIG. 1) in which they provide continuity and dynamics with the inner wall 33 of the movable cowl 13, and a reverse jet position (Figure 2) in which they seal the cold air duct 35 delimited by the inner wall 33 of the movable cowling 13 and the fairing (often referred to as IFS: "Internai Fixed Structure") surrounding the turbojet engine (not shown).
• IFS Internai Fixed Structure
• This air deflection towards the front of the nacelle causes braking of the aircraft during landing.
• the geometry of the fittings 25 is studied so that in the direct jet position they are placed just upstream of the rear frame 11, without interfering with it.
• the axis desd its cylinders 1 9 is s itu é s s the exact extension of the inner diaphragm 17, so as to ensure an optimal distribution of efforts.
• the front frame 9 comprises housings, that is to say openings adapted to accommodate the fitting 25 when the movable cover 13 is in the direct jet position.
• FIG. 3 differs from the preceding one essentially in that the seal 29 is now disposed inside an annular groove formed inside the front frame 9, the upstream edge 27 of the inner diaphragm 17 then comprising in this case, a skirt 43 adapted to fit into the groove 41, and therefore to compress the seal 29 in the direct jet position.
• the jack 19 can be arranged slightly more towards the outside of the nacelle, to the point that it interferes with the volume defined by the deflection grid 7: in this case, spaces are provided between the deflection grids 7, so as to allow the passage of the actuating rod 23 of the jack 19.
• the fitting 25 is then of course shaped so as to allow the correct attachment of the end of the actuating rod 23 of the jack with the upstream edge 27 of the inner diaphragm 17.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=43413354

Family Applications (1)

Country Status (8)

Families Citing this family (5)

Family Cites Families (20)

• 2010
  • 2010-05-17 FR FR1053785A patent/FR2960029B1/fr active Active
• 2011
  • 2011-05-10 EP EP11725145A patent/EP2572097A1/de not_active Withdrawn
  • 2011-05-10 WO PCT/FR2011/051046 patent/WO2011144837A1/fr active Application Filing
  • 2011-05-10 CA CA 2798484 patent/CA2798484A1/fr not_active Abandoned
  • 2011-05-10 BR BR112012027593A patent/BR112012027593A2/pt not_active IP Right Cessation
  • 2011-05-10 RU RU2012153437/06A patent/RU2570482C2/ru not_active IP Right Cessation
  • 2011-05-10 CN CN201180023775.5A patent/CN102893010B/zh not_active Expired - Fee Related
• 2012
  • 2012-11-19 US US13/681,210 patent/US9109540B2/en active Active

Non-Patent Citations (1)

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