• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a liquid drainage installation (3) out of an engine compartment (1) aircraft. Said drainage installation comprises a collector (2) of said liquid (3) provided with an opening (5) providing fluidic communication between the collector (2) and an upstream outlet (7) of a drainage line (4). ) open on the outside to a downstream outlet (8). The drainage line (4) comprises an obstacle (10) to the flow of the liquid (3) allowing a circulation of the liquid (3) to the downstream outlet (8) of the drainage line (4) in a predefined quantity of liquid (3) retained by said obstacle (10). The opening (5) of the collector (2) is provided with a fire shield (11) arranged in a cap extending in elevation (E) overhanging the opening (5) and having a plurality of orifices. (14) distributed at the periphery of the fire barrier (11) from its base to its top.
    公开号:FR3016342A1
    申请号:FR1400061
    申请日:2014-01-13
    公开日:2015-07-17
    发明作者:Thibault Jullie；Franck Morente
    申请人:Airbus Helicopters SAS；
    IPC主号:
    专利说明:

    [0001] Liquid drainage installation in an engine compartment of a rotorcraft. The present invention is in the field of fluid drainage installations equipping motorized aircraft, including rotorcraft 5, for discharging liquid flowing into a compartment housing an engine of the aircraft. Motorized aircraft, such as aircraft or rotorcraft, for example, are equipped with a power unit comprising one or more combustion engines to provide at least the propulsion of the aircraft. The engine or engines are located on board the aircraft in compartments dedicated to them and are for example of the explosion type or turbine engine type operating a liquid fuel. There arises the problem of securing the aircraft with respect to a stagnation of flammable liquid (s) in the compartment or compartments respectively housing the engine (s), commonly known as "engine compartments". Indeed, a stagnation of flammable liquid (s) in the engine compartment (s) is a potential source of danger because of the high temperatures prevailing in the environment close to the engine group. Such flammable liquids are in particular fuel and / or lubricant accidentally escaping from the engine group, or even for example a residue of maintenance fluid from the engine group. This is why the aircraft are equipped with a stagnant liquid drainage installation potentially inside the engine compartment (s) in order to collect the said liquid and to evacuate it outside the aircraft. The liquid to be drained includes not only the flammable liquid (s), but also water infiltrating into the engine compartment (s), potentially in a substantial amount.
    [0002] Such drainage installations comprise a drainage line in fluid communication with a liquid collector arranged at the bottom of a given engine compartment. Liquid likely to stagnate in the engine compartment is drained by the collector which has at least one opening placed in communication with an outlet upstream of the drainage line. The liquid discharged from the manifold through the opening is conveyed through the drainage line for rejection outside the aircraft through a downstream outlet of the drainage line. In this context, there is the problem of the organization of the drainage installation taking into account various constraints. A constraint relating to the organization of the drainage installation lies in the depression state of the engine compartment vis-à-vis the pressure of the external environment of the rotorcraft. The depression state of the engine compartment is notably due to the air circulation inside the drainage line and to the openings of the engine compartment towards the outside of the aircraft. The depression state of the engine compartment also increases according to the altitude and / or the speed of progression of the aircraft, or even in the specific case of a rotorcraft according to the orientation of the blast produced by a main rotor to substantially vertical axis located in overhang close to the engine group to provide at least the lift of the rotorcraft. Also in the case of a rotorcraft, the drainage line is typically implanted from the top of the rotorcraft towards its base, which favors the pressure difference between the upstream and downstream outlets of the drainage line. Indeed, for another type of aircraft whose longitudinal extension between the front and rear is consistent, such as for an aircraft, the drainage line can extend by being oriented along a slight slope.
    [0003] It appears that said depression state of the engine compartment is an inconvenience against the discharge of the liquid through the drainage line. Consequently, it is known to provide on the drainage line, between the collector and a downstream zone of the drainage line, an obstacle for retaining the liquid drained by the collector. The liquid retained upstream of the obstacle is spontaneously evacuated towards the downstream zone of the drainage line when the pressure of the column of liquid retained is sufficient to overcome the pressure difference between the collector and the downstream outlet of the line. drainage. Such an obstacle is for example formed of a valve controllable at the opening at a given pressure threshold, as described by the document EP1062155 (ALLIED SIGNAL INC), or for example still is formed of a necking formed on the line as described in EP2620361 (AIRBUS OPERATIONS SL). Another constraint relating to the organization of the drainage installation lies in its securing vis-à-vis a possible progression of flames from the collector to the drainage line in case of fire in the compartment (s) ( s) engine. For this purpose, one or more conduits forming the drainage line are conventionally formed from a flame retardant material. It should be noted that a disadvantage of these provisions lies in the increase in the mass, the size and / or the costs of obtaining the drainage line. In this context and as part of a constant search in the field of aeronautics aimed at securing the rotorcraft against the spread of a possible fire, it is appropriate to improve the conditions for the preservation of the drainage installation by prohibiting a passage of flames from the collector 30 to the drainage line.
    [0004] It is known in various fields to use fire barriers forming an obstacle to the passage of flames through an opening in case of fire. Such fire protection grids are conventionally used in the building industry, for example.
    [0005] However, the constraints due to said depression state of the engine compartment make adaptation of such fire resistant grids to the field of aeronautics. Nevertheless it is useful to seek a solution to provide the opening of the tine collector such a firewall. Indeed, equipping the opening of a grid has other advantages, such as to provide retention of possible solids within the collector to prevent their passage to the drain line. It is indeed advisable to avoid a clogging of the drainage line by such solid bodies, not only so as not to hinder the flow of the liquid within the drainage line but also because of their potential flammable nature. However, if such fireguards can have the advantage of retaining said solid bodies, they are also inversely able to hinder the passage through the opening of the collector not only of the liquid, but also of the rising air. to the collector by being driven out by the liquid flowing through the drainage line. This is why it is usual in the field of aircraft to favor a clearance of the opening of the collector to optimize the freedom of passage through the liquid drained by the collector, avoiding unduly increasing the cross section of the collector. or ducts forming the drainage line.
    [0006] Indeed, in the context of another constraint relating to the organization of the drainage line, such an increase in the cross section of the conduit or ducts is not desirable. More particularly, the drainage line extends or is integrated along the walls of the aircraft. Consequently, it is sought for the drainage line congestion and a mass as small as possible to facilitate its integration on board the aircraft. The object of the present invention is to provide a liquid drainage installation 10 out of a motor compartment of an aircraft, including a rotorcraft. On the basis of the observation that has just been made and which is based on a reflection of which is the approach of the present invention, it is more particularly sought such a drainage installation 15 providing a satisfactory compromise vis-à-vis in particular the set of problems and constraints mentioned. The drainage installation of the present invention comprises a collector of the liquid stagnant in said engine compartment. The collector is provided with at least one opening providing fluidic communication between the collector and an upstream outlet of a drainage line open to the outside at a downstream outlet. The drainage line of the present invention also comprises an obstacle to the flow of liquid formed between the upstream outlet and the downstream outlet of the drainage line. Said obstacle is able to allow a circulation of the liquid towards the downstream outlet of the drainage line according to a predefined quantity of liquid retained by said obstacle, said retained liquid coming of course from the collector for its evacuation outside the line of drainage through its downstream outlet.
    [0007] The drainage installation of the present invention is mainly recognizable in that said at least one opening of the collector is provided with a fire gate arranged in a cap extending in elevation overhanging the opening and having a plurality of orifices distributed around the periphery of the fire barrier from its base to its top. The cap is a member conventionally formed of a wall forming an enclosure having an outlet on the outside. The outlet of the cap is of course placed at the edge of the opening of the collector, the cap reserving overhanging the opening a volume communicating with the interior volume of the collector through said orifices. The base of the fire barrier is of course understood as being located in the lower zone near the opening of the collector, as opposed to the top of the firewall located in the upper zone opposite said base in the direction extension in elevation of the fire screen. In the case of liquid drainage by the collector, said liquid is able to flow towards the drainage line through the orifices provided in the lower zone of the fire barrier while the air from the drainage line and fed to the collector under the effect of the flow of liquid from the collector to the drain line, escapes through the orifices in the upper zone of the fire barrier.
    [0008] It emerges that despite a potentially large volume draining of the liquid by the collector and despite the presence of air in the drainage line that can oppose a satisfactory flow of liquid from the collector, the evacuation of said liquid through the fire barrier towards the opening is favored by facilitating the ejection of the air out of the drainage line to the collector through the orifices in the upper zone of the fire barrier.
    [0009] In addition, the capping arrangement extending in elevation of the fire barrier makes it possible to increase its area and to increase the number of orifices and consequently to increase the overall perforated surface of the fire barrier. A comfortable evacuation of the liquid can thus be obtained despite partial closure of the opening by the firewall, and this including in case of retention by the fire grate of any detritus from the collector. The surface and / or the individual conformation of said potentially large number of orifices can be adapted to give the grid its fire-resistant character preventing the possible passage of flames from the collector towards the drainage line. The drainage line being preserved from a source of fire from the engine compartment (s), the ducts that compose it can be dispensed with special arrangements 15 to protect them from flames, with the advantages of limiting their mass, their size and their cost of obtaining. It is preferred to dimension the fire barrier so that, irrespective of the amount of liquid drained by the collector, the liquid is discharged from the collector prior to immersion of the fire barrier 20 by the liquid drained by the collector. manifold. In accordance with the provisions of the invention, however, the evacuation of the liquid towards the drainage line is provided, even in the case of immersion of the fire barrier. In fact, since the pressure of the liquid exerted in the lower zone of the fire barrier is greater than the pressure of the liquid exerted in the upper zone of the fire barrier, the liquid tends to flow easily through the cut-off grid. fire without obstructing the evacuation of air. Such ease of flow is provided even in the case of a small individual dimensioning of the orifices which in itself gives the fire barrier 30 its ability to hinder the passage of flames therethrough.
    [0010] Indeed, another constraint to be taken into consideration in the case of a small individual dimensioning of the orifices, lies in the surface tension of the liquid which tends to oppose its passage through orifices of small surface, especially if these orifices are of circular conformation. The pressure exerted in the lower zone of the fire barrier by the column of liquid drained by the collector is found to be sufficient to inhibit any difficulty of passage of the liquid through openings of small individual surface. The arrangement of the orifices relative to each other and their distribution through the firewall are potentially homogeneous from the base to the top of the firewall. The arrangement of the orifices is of course understood with regard to their individual dimensions and their conformation. It may, however, have been found potentially useful to vary from the base to the top of the firewall, the arrangement of the orifices relative to one another and / or their distribution through the fire barrier. More particularly, the arrangement of the orifices relative to each other and their distribution through the fire barrier 20 potentially vary from the base to the top of the fire gate, between a low area and a high area of the firewall. fire grate. Said lower zone of the fire barrier is identified as being dedicated to evacuation to the drainage line of the liquid drained by the collector. Said upper zone of the fire gate is identified as dedicated to the escape to the air collector from the drainage line. Furthermore and according to a preferred embodiment, the outlets of the orifices are shaped and dimensioned according to a flame jamming distance of between 0.5 mm and 3 mm.
    [0011] These provisions are such that the orifices confer in themselves on the grid its fireproof character by exempting it from any other particular provision as conventionally in the field of building by exploiting an intumescent material.
    [0012] It is recalled that in the field of firefighting, a flame jamming distance is defined as being a maximum dimension of a passage making it possible to obtain a jamming of a flame. It has appeared after tests that a judicious choice was to give the outlets of the orifices a circular conformation and an individual surface of between 2 mm 2 and 6 mm 2. In addition, such a wedging distance imparted to the sizing of the orifices does not, however, prevent the obtaining of a satisfactory flow rate of flow of the liquid through the fire barrier. Indeed, the orifices can be formed in a number consequent through the large surface offered by the wall forming the fire barrier extended in elevation, providing a cumulative surface of the orifices consequent to reinforce the flow of liquid through the gate cutter. traffic light. According to one embodiment, the conformation of the fire barrier is adapted to favor, for a larger number of possible orifices, an orientation of the orifices through the thickness of the grid in a direction transverse to the direction of extension in elevation of the fire screen. More particularly, the orifices are preferably formed predominantly, or even completely, through the lateral faces of the fire barrier being oriented transversely to the direction of extension in elevation of the fire barrier.
    [0013] The elevation dimension of the fire barrier is preferably greater than a permissible liquid height within the manifold. Said liquid tolerated height is in particular identified according to the authorized liquid flow through the fire barrier, at least in the lower zone, and according to the volume of the drainage line considered between its downstream outlet and said obstacle. The opening of the collector is preferably in fluid communication with the drainage line via a funnel-shaped connector. These arrangements are such that the dimensions of the opening of the collector and therefore the dimensions of the firewall can be optimized without involving an increase in the section of the duct of the drainage line connected to the collector via the opening with funnel. According to a preferred embodiment, said obstacle is formed of a valve controllable at the opening at a predetermined threshold of pressure of the liquid from the manifold exerted on the valve. According to a preferred conformation of the fire barrier, at least the lateral faces of the fire barrier are defined by a surface of revolution conferring on the fire barrier a preferred dome or even cone or cylinder conformation. Such arrangements make it possible to optimize the surface of the fire barrier, preferably in the lower zone, to optimize the discharge rate of the liquid from the collector towards the drainage line. According to another possible conformation of the fire barrier, the cross section of the fire barrier is of polygonal conformation. In this case, the side faces of the fire barrier are potentially inclined with respect to the elevation extension direction of the fire barrier by imparting a pyramidal shape thereto.
    [0014] Exemplary embodiments of the present invention will be described in connection with the figures of the accompanying plate, in which: - Fig.1 is a schematic representation of a drainage installation according to one embodiment of the invention. FIGS. 2 and 3 are perspective representations of respective embodiments of a fire-resistant grid that comprises the drainage installation shown in FIG. In Fig.1, a drainage installation is intended to equip a rotorcraft for the discharge of liquid 3 out of a engine compartment 1 of the rotorcraft. The drainage installation comprises a manifold 2 formed in the bottom of the engine compartment 1 for draining the liquid 3 and leading it to a drainage line 4 for rejection towards the outside of the rotorcraft. The collector 2 comprises at its bottom a plurality of openings, such as the opening 5 illustrated, through which the liquid 3 is discharged from the collector 2 to a conduit 6 equipping a given opening 5 by providing an upstream outlet 7 of the drainage line 20 4. The liquid 3 is able to flow along the drainage line 4 to be evacuated to the outside of the rotorcraft through a downstream outlet 8 of the drainage line 4. Of course, the concepts "Upstream" and "downstream" are relative notions considered according to the flow direction of the liquid 3 along the drainage installation from the collector 2 to the downstream outlet 8 of the drainage line 4. Said opening 5 is connected to the upstream outlet 7 of the drainage line 4 by means of a funnel 9 with a reduction gear function between the widest desired opening 5 and the upstream outlet 7 of the drainage line 4 desired as small a footprint as possible. The extension of the drainage line 4 along the rotorcraft between the upstream outlet 7 and the downstream outlet 8 is likely to be consistent with the vertical extension of the rotorcraft considered on the ground. A significant pressure difference is typically noted between the collector 2 and the downstream outlet 8 of the drainage line 4. To prevent a depression of the collector 2 does not hinder the flow of liquid 3 through the installation of drainage, an obstacle 10 to the passage of the liquid 3 is provided on the drainage line 4 between the upstream outlet 7 and the downstream outlet 8. In the exemplary embodiment illustrated, such an obstacle 10 is formed of a valve controllable at opening at a predetermined pressure threshold S 15 according to the column of the liquid 3 retained upstream of the obstacle 10. The opening 5 is equipped with a fire barrier 11 housed inside the collector 2 to prevent the flames to the collector 2 in the event of a fire in the drainage line 4. Such a fire barrier 11 also has the advantage of retaining any solids to prevent their passage through the opening 5 to the drainag line 4. In FIGS. 1 to FIG. 3, the fire barrier 11 is arranged in a cap capable of covering the opening 5 of the collector 2 by extending in elevation 25 E overlying the bottom of the collector 2. such cap comprises a wall delimiting a fence enclosure volume defined by the fire gate 11, providing at its base an outlet 12 of the fire gate 11 to be placed opposite the opening 5 of the collector 2 .
    [0015] In the exemplary embodiments illustrated, the fire barrier 11 is also provided with an assembly member 13 at the bottom wall of the collector 2. Such an assembly member 13 is potentially arranged in a platen for fixing the fire grate for its implantation at the bottom of the collector 2. Orifices 14 are formed at least through the lateral faces of the fire barrier 11, being distributed at the periphery of the fire barrier 11 from its base to its Mountain peak. Such orifices 14 place the internal volume of the fire barrier 11 in fluid communication with the interior volume of the collector 2. As illustrated in FIG. 1, orifices 14 of a first set made in the lower zone of the 11 are dedicated to the evacuation 15 of the liquid 3 out of the collector 2. Orifices 14 of a second set formed in the upper zone of the fire barrier 11 are dedicated to the escapement 16 to the collector 2 of the air coming from the drainage line 4. The qualifications of "low" and "high" of the zones of the fire barrier 11 are relative notions considered according to the direction of extension in elevation E of the fire gate 11, the low zone 20 being oriented towards the base of the fire barrier 11 and the upper zone being directed towards the top of the fire barrier 11. Of course in the operating situation of the installation of drainage, the mentioned destinations of orifices 14 do not pre do not judge of the nature of the fluid likely to flow through the different sets of orifices 14, especially in the extreme case of immersion of the fire barrier 11. Nevertheless, and according to a major advantage of the present invention, the liquid 3 Drained by the collector 2 is able to pass through the fire barrier 11 through the orifices 14 of the first clearance while the air coming from the drainage line 4 is able to escape towards the collector 2 through the orifices 14 of the second game
    [0016] In Fig.1, the fire screen 11 is arranged in a cylinder. In Fig.2, the fire gate 11 is arranged in a dome. In Fig.3, the fire gate 11 is arranged in a pyramid whose base is defined by a polygon with four sides.
    [0017] Such general conformations of the firestop 11 in the form of a cylinder, a dome or a pyramid are illustrated as non-restrictive exemplary embodiments with regard to the various potential conformations of the fire barrier 11. As illustrated on FIG. fig.1 and fig.3, the individual arrangement of the orifices 14 vis-à-vis their conformation and / or their dimensions, as well as the distribution of the orifices 14 at the periphery of the fire barrier 11, are likely to to be homogeneous. In Fig.2, the individual arrangement of the orifices 14 vis-à-vis their size, or even potentially vis-à-vis their conformation, and the distribution of orifices 14 at the periphery of the firewall 11 vary between the low zone and the high zone of the fire gate 11. In Fig.1 to Fig.3, the orifices 14 are of circular conformation and are mostly or entirely formed through the outer wall of the grid cutter. fire 11 transversely to the direction of extension in elevation E of the fire barrier 11. The individual surface of the orifices 14 is advantageously between 2 mm 2 and 6 mm 2, so that the orifices 14 are able to oppose them. and without any other specific arrangements to pass through them possible flames from the collector, to prevent their passage to the drainage line 4 in case of fire in the engine compartment. These arrangements allow, only from the sizing and / or the conformation of the orifices 14, to give the grid 11 its firebreak character.
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. Liquid drainage installation (3) outside an aircraft engine compartment (1), said drainage installation comprising a collector (2) of said liquid (3) provided with at least one opening (5) providing fluid communication between the collector (2) and an upstream outlet (7) of a drainage line (4) open to the outside to a downstream outlet (8), the drainage line (4) comprising an obstacle (10) at the flow of the liquid (3) formed between the upstream outlet (7) and the downstream outlet (8) of the drainage line (4), said obstacle (10) being able to allow a circulation of the liquid (3) towards the downstream outlet (8) of the drainage line (4) according to a predefined quantity of liquid (3) retained by said obstacle (10), characterized in that said at least one opening (5) of the collector (2) is provided with a fire barrier (11) arranged in a cap extending in elevation (E) overhanging the opening (5) and comprising a plurality of ori fices (14) distributed at the periphery of the fire barrier (11) from its base to its top.
    [0002]
    2. Drainage installation according to claim 1, characterized in that the arrangement of the orifices (14) relative to one another and their distribution through the fire barrier (11) are homogeneous from the base to the top. the fire screen (11).
    [0003]
    3. Drainage installation according to claim 1, characterized in that the arrangement of the orifices (14) relative to each other and their distribution through the fire barrier (11) vary from the base to the top of the fire grate (11), between a lower zone of the fire barrier (11) dedicated to the evacuation (15) towards the drainage line (4) of the liquid (3) drained by the collector (2) and high zone of the fire gate (11) dedicated to the escapement (16) to the collector (2) of air from the drainage line (4).
    [0004]
    4. Drainage installation according to any one of claims 1 to 3, characterized in that the outlets of the orifices (14) are shaped and dimensioned according to a flame entrapment distance of between 0.5 mm and 3 mm, the orifices (14) conferring in themselves to the grid (11) its fire-resistant character.
    [0005]
    5. drainage installation according to any one of claims 1 to 4, characterized in that the outlets of the orifices (14) are of circular conformation and have an individual surface of between 2 mm2 and 6 mm2.
    [0006]
    6. drainage installation according to any one of claims 1 to 5, characterized in that the orifices (14) are formed predominantly through the side faces of the fire barrier (11) being oriented transversely to its direction d extension in elevation (E).
    [0007]
    Drainage installation according to one of Claims 1 to 6, characterized in that the elevation dimension of the fire barrier (11) is greater than a liquid height (3) permitted inside the collector. (2).
    [0008]
    8. Drainage installation according to any one of claims 1 to 7, characterized in that the fire barrier (11) is in fluid communication with the drainage line (4) via a connector arranged in funnel (7).
    [0009]
    9. drainage installation according to any one of claims 1 to 8, characterized in that said obstacle (10) is formed of a valve controllable at the opening at a threshold (S) predetermined pressure of the liquid (3) from the manifold (2) exerted on the valve.
    [0010]
    10. drainage installation according to any one of claims 1 to 9, characterized in that at least the side faces of the fire barrier (11) are defined by a surface of revolution.
    [0011]
    11. drainage installation according to any one of claims 1 to 9, characterized in that the cross section of the fire barrier (11) is of polygonal conformation.
    类似技术:
    公开号 | 公开日 | 专利标题
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    EP0899518B1|2003-11-12|Ventilation system for a livestock building
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    FR2855842A1|2004-12-10|EXTREME HIGH AIR PERFORMANCE SMOKE EXTRACT SPECIFICALLY SUITABLE FOR CONSTRUCTION OR BUILDING ROOF VENTS
    FR2897480A1|2007-08-17|Electrical box, has door equipped with fingers which extend across ventilation openings and to interior of shell with respect to openings, where shell is delimited by wall, and ventilation devices forming baffles
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    同族专利:
    公开号 | 公开日
    US20150197346A1|2015-07-16|
    US9358410B2|2016-06-07|
    FR3016342B1|2016-01-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3371482A|1965-06-14|1968-03-05|Snecma|Jet propulsion casings having fuel drainage means|
    WO1999046167A1|1998-03-13|1999-09-16|Alliedsignal Inc.|Apu compartment drain system|
    US20060249628A1|2005-05-05|2006-11-09|Honeywell International Inc.,|Non-streaking drainmast|
    EP2620361A1|2012-01-26|2013-07-31|Airbus Operations, S.L.|Drainage mast of the compartment of the auxiliary power unit of an aircraft|
    US2156509A|1935-04-18|1939-05-02|Frans G D Muller|Flame arrester safety device|
    US5552576A|1992-02-21|1996-09-03|The Bf Goodrich Company|Modular drainmast for aircraft|
    US6425554B1|2000-10-12|2002-07-30|The B. F. Goodrich Company|Bottom discharge drainmast for an aircraft|
    US7731127B2|2005-05-18|2010-06-08|Airbus Deutschland Gmbh|Drain mast connector|US10731553B2|2017-08-10|2020-08-04|Bell Helicopter Textron Inc.|Engine compartment flammable fluid drainage system|
    US10589833B2|2018-03-07|2020-03-17|The Boeing Company|Drain grommet with integrated fire shield|
    US10807694B2|2018-06-06|2020-10-20|Textron Innovations Inc.|Track integrated with rails, outer mold line, and support for step loads|
    US11248743B2|2018-10-09|2022-02-15|Textron Innovations Inc.|Composite drain pan|
    法律状态:
    2015-01-21| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-01-20| PLFP| Fee payment|Year of fee payment: 4 |
    2018-01-19| PLFP| Fee payment|Year of fee payment: 5 |
    2020-01-21| PLFP| Fee payment|Year of fee payment: 7 |
    2021-01-21| PLFP| Fee payment|Year of fee payment: 8 |
    2022-01-19| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1400061A|FR3016342B1|2014-01-13|2014-01-13|LIQUID DRAINAGE INSTALLATION COMPRISING A MOTOR COMPARTMENT OF A GIRAVION|FR1400061A| FR3016342B1|2014-01-13|2014-01-13|LIQUID DRAINAGE INSTALLATION COMPRISING A MOTOR COMPARTMENT OF A GIRAVION|
    US14/594,532| US9358410B2|2014-01-13|2015-01-12|Liquid drainage installation for a rotorcraft engine compartment|
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