• 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 spark plug (150) and the spark plug (190) each have a thread (105). These threads are screwed together, in order to stabilize radially to the axis (30a) of the combustion chamber the spark plug, relative to the outer longitudinal wall (90) of this chamber.
    公开号:FR3015642A1
    申请号:FR1363487
    申请日:2013-12-23
    公开日:2015-06-26
    发明作者:Pierre-Francois Simon Paul Pireyre；Francois Leglaye；David Gino Stifanic
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the field of gas turbine engines and in particular the arrangement of a spark plug in a combustion chamber. More specifically still is concerned an assembly comprising a turbomachine plug and a radial attachment device of this candle.
    [0002] Hereinafter, and unless the context makes it explicitly understood differently, the term "axial" refers to the longitudinal axis of the combustion chamber considered, "radial" refers to what is transverse to this axis, so strictly perpendicular, or not, "external or external" is defined with respect to said longitudinal axis vis-à-vis which which is "inner or inner" is radially closer and is surrounded (at least in part) by what is therefore "Outside or outside". FIG. 1, which is extracted from FR-A-2900976, shows schematically an embodiment of the prior art in which we see a (part of) turbomachine 1 where, as in the following figures, gases flow globally and longitudinally from upstream (AM) downstream (AV). This (part of) turbomachine 1 comprises: - a combustion chamber 3 having a longitudinal axis 3a and comprising: - a device 5 for injecting air and fuel centered substantially on the axis 3a of the combustion chamber, which axis extends generally along the longitudinal axis 1a of the turbomachine, - (at least) an inner longitudinal wall (also called ferrule) 7 and (at least) an outer longitudinal wall 9 having a first opening 9a substantially transverse to the axis 3a, an outer casing 11 having a second opening 11a also substantially transverse to the axis 3a of the combustion chamber, a device 13 for fixing the spark plug 15, this device comprising: a spark plug adapter 16 fixed towards a first end to the outer casing 11, facing the second opening 11a and through which the spark plug 15 passes; - a spark plug 19 held in contact with the outer longitudinal wall 9, opposite of the first opening 9a and through which passes the candle to open into the combustion chamber. The combustion chamber 3 is contained in an annular space, formed by the outer casing 11 and the inner annular wall 17, and concentric with the unrepresented shafts connecting the turbine block to the compressor block of the turbomachine. The (or each) outer ferrule 9 is provided with a flange, or support, 21, of connection with the outer casing 11, and the (or each) inner ferrule 7 is provided with another flange, or support, 23 connection (fixing) with the inner annular wall 17. The space defined radially by the inner ferrule 7 and outer 9 contains upstream transverse chamber bottom 25 associated with upstream fairings. A plurality of fuel injectors distributed around the longitudinal axis of the turbomachine (such as the rod 27 which ends along the axis 3a) open into the interior volume 29 of the combustion chamber through the chamber bottom 25. Deflectors 31 form a bowl around each supply rod, radially and swirling towards the sprayed fuel part of the air which has entered the faired area 29 and thus ensure the formation of a fuel mixture with air. A primary combustion zone may be formed downstream of the chamber floor in which the mixture is ignited by the candle 15 or more such candles distributed circumferentially. Part of the air coming from the compressor and arriving through the diffuser 32 bypasses the fairing formed by the ferrules 7 and 9, is guided in the annular spaces 33 and 35, between the interior volume 29 of the chamber 3 and the two outer housings 11 and inside 17, respectively, then is introduced into this volume 29 downstream of the primary combustion zone (orifices 37, 39) to form the flow of engine gas which is distributed to the downstream turbine rotor not shown.
    [0003] Through the orifice 11a, the spark plug 15 passes through the casing 11 and extends radially inwards to substantially flush with the outer shell 9 through the orifice 9a. The spark plug 15 is retained on the outer casing 11 by the spark plug adapter 16 which it passes through. The candle adapter 16 comprises a tubular portion forming a cylindrical housing, a portion of which is threaded and wherein the candle is retained by screwing. The tubular portion is associated with a plate, perpendicular to the cylindrical housing, which is provided with holes for fastening members of the adapter to the outer casing 11. At its front end and in front of the orifice 9a, the candle 15 passes through. the candle-guide 19, which is mounted in a chimney 20 surrounding the orifice 9a and fixedly fixed to the outer casing 11. The candle-guide forms a floating sleeve which circles the candle and comprises a flange 19a, radial with respect to this ci, slidably mounted between corresponding guide surfaces integral with the chimney 20 and which seals.
    [0004] As is conventional, the candle 15 is cooled by the air flow in the space 33, by air impingement passing through the candle guide 19 and by conduction on the outside of the candle adapter. In particular for a low-voltage candle, the limiting factors of its lifetime are mainly: - a breakdown of the candle under a high pressure, - an exposure of the front end of the spark plug where sparks occur with fuel (or other fluid such as water), and - exposure of this candle end to high temperatures (> 600 ° C).
    [0005] Currently, the candle mounting configuration presented above appears overall satisfactory. However, we seek to further improve the life of candles exposed to increasingly hot flames. Certainly original, mounting, the front (or nose) 15a candle is positioned flush with the wall of the outer shell 9 belonging to the flame tube of the combustion chamber. However, in operation, this flame tube expands and the candle, bringing the nose of the candle out of the protective air film and thus to enter the flame (hot gas), the most severe conditions. Under these conditions, one objective is to favor the maintenance of a substantially constant radial positioning of the nose of the candle with respect to the vein of the flame tube in view of a gain in lifetime of the candle and of a breakdown thereof (spark generation) under any circumstance, regardless of the operating phase of the turbomachine. Thus it is proposed, in order to tend towards this objective, a set of the aforementioned general type, comprising a turbomachine plug and a device for radial attachment of this plug to a part of the turbomachine, which comprises: a chamber of combustion having a longitudinal axis and comprising: - an air and fuel injection device, - (at least) an inner longitudinal wall (or ferrule) and (at least) an outer longitudinal wall having a first opening substantially transverse to said axis, - an outer casing having a second opening also substantially transverse to the axis of the combustion chamber, - the attachment device of the candle, which device comprises: - a candle adapter fixed to a first end to the outer casing, facing the second opening and through which the candle under consideration, and - a candle guide held in contact with the longitudinal outer wall opposite the first opening and through which the candle passes to open into the combustion chamber, this assembly being characterized in that the candle and the candle guide each have a thread, the threads being screwed together, in order to to stabilize radially to the axis of the combustion chamber the spark plug, with respect to said external longitudinal wall. By positioning the candle nose radially optimally with respect to the flame tube, and thus to the outer shell, it will be possible to improve the ignition capacity of the turbomachine on the ground and in flight. In order to promote a freedom of expansion of the chamber relative to the outer casing, it is furthermore recommended that the spark plug and the spark plug-guide be, together, mounted freely relative to this casing, in a direction substantially radial to the axis of the second opening. Another difficulty may also arise from the friction of the guide-plug against the walls of the annular boss of the external longitudinal wall that receives it. In fact, under certain operating conditions of the turbomachine, the spark plug and the spark plug guide are radially biased towards the outer casing which is not solicited in the same manner. A friction of the guide-plug against the relevant wall of the annular boss of the outer longitudinal wall can then occur. So as to facilitate the sliding, in particular substantially axial, of the guide-plug more generally in the phases of radial and / or axial expansion of the walls of the inner chamber of the combustion chamber relative to the housing, phases in which the candle may exert a radial force on the outer shell, it is proposed that between the guide-plug and the relevant wall of the annular boss of the outer longitudinal wall is interposed a substantially axial sliding means. For this purpose, ball bearings can be provided; Another possible solution of sliding means: a choice of materials in contact promoting sliding to reduce the coefficient of friction between them (such as a ceramic-based coating, for example consisting of a sol-gel type material, or carbon / graphite with self-lubricating property). During operation of the turbomachine, it is also necessary that the space under the outer casing is isolated in a gas-tight manner from radially outermost areas.
    [0006] It is therefore important to promote a seal between the nose of the candle and its opposite end. It is thus recommended that, in the candle adapter, the candle be provided with a flange which locally surrounds it and which is in connection (preferably by compression) with at least one joint disposed in support between an inner flange of the candle adapter and the flange. To optimize this tightness, it is even proposed that several joints are provided comprising first and second deformable joints disposed on either side of the flange for a seal on either side of this flange: when radially a seal will relax the other seal will be compressed. It is recommended that the two joints be balanced so as to transmit (virtually) no radial force to the chamber, mounting. In order to allow the candle to be cooled from the outside, and to dilute any minor leaks at the candle flange, it is proposed that the candle adapter has a second end opposite the first one. end, scoop holes for an air passage between the inside and outside of the candle adapter To further promote both the assembly and disassembly of the candle adapter, especially to replace the candle it is proposed that this spark plug adapter has first and second bonded parts to be mounted together and disassembled to each other substantially parallel to the axis of the second opening of the outer casing, preferably in an area surrounding the joint (s) where, preferably, the flange will extend if it is provided. Two other requirements have also been taken into account: - a controlled positioning of the candle in the candle adapter, along the longitudinal axis of this candle which is its axis of assembly / disassembly, thus avoiding impact on the service life of the candle or to alter that of the adapter, and a limitation of the vibrations of the candle when the turbomachine 10 is running. These taken into account are embodied by the fact that the candle and the candle adapter are preferably provided with centering locally comprising a bead around the candle, this bead being peripherally closer to the inner face facing the adapter 15 candle than are the one of the other, elsewhere along the longitudinal axis of the candle, the faces opposite the candle and the adapter. This solution, preferred to that possible, a bead (or any other local restriction of internal section) on the internal face of the adapter, is provided to not impact the assembly / disassembly of the candles. A particular solution for producing these centerings consists in not using a cylindrical surface, but a spherical surface and increasing the clearance between the spark plug and, peripherally, the internal face of the rear (outer) end portion of the adapter. candle, to limit the hyperstatism and give more flexibility to the candle in case of tilting of the ferrules, so the combustion zone. A risk of this solution, however, lies in a possible increase in the vibrations of the candle around its spherical range and an acceleration of wear of the latter. However, although the candle is a consumable that must be changed for safety constraints of spark productions, it is typically not sought to create pre-identified sources of potential problems. , 8 Also a centering solution by cylindrical scope is not excluded. It will also be noted that in addition to this "turbomachine plug and radial attachment of the spark plug" assembly, the invention also relates to a turbomachine comprising this assembly, including the combustion chamber and the outer casing. In connection with the above, we will now come back in more detail on different aspects of what has been presented above, this with reference to the accompanying drawings in which: Figure 1 shows in longitudinal section a part 10 of a chamber of combustion of gas turbine engine according to an example of the prior art, Figure 2 shows, in the same section but in enlarged view and more locally (zone II), the candle and its mounting environment (in a corresponding version, As in the following figures, at least part of the updated solutions presented here), FIG. 3 shows, in front view, an anti-rotation system applied to the guide-candle, FIGS. a view like that of Figure 2, three successive steps of mounting the candle and the candle adapter, Figure 7 shows, still in a view like that of Figure 2, a spherical bearing solution on the candle, and FIGS. 8, 9 and 10 still in a view like that of FIG. 2, three situations of relative positioning of the candle, the candle guide and the candle adapter, as well as, in fact, of the outer ferrule and the outer casing. Figures 2 and following therefore constitute an updated version 25 attached to the invention. In these figures, corresponding parts or elements have been referenced with an additional "0". The spark plug 15 therefore becomes 150. Thus, in particular in FIG. 2, the claimed assembly 100 which comprises the turbomachine spark plug 150 and the device 130 for fixing the spark plug 30 is shown.
    [0007] In this figure, or in its environment on the turbomachine assuming the zone II of Figure 1 replaced (to scale) by the illustration of Figure 2, there are: - the combustion chamber 30 with its axis 30a and comprising: - the longitudinal wall or outer shell 90 and the longitudinal wall or inner shell, which delimit between them, radially to the axis 30a, the internal volume 290 of the combustion chamber, - the first opening 90a of the outer shell 90, the outer casing 110, the fixing device 130 including the candle adapter 160 fixed to the outer casing 110, facing the second opening 110a, also substantially transverse to the axis 30a, and the candle guide 190 maintained in contact with the outer shroud 90, facing the opening 90a, - the chimney 200 fixedly fixed to the outer casing 11 and surrounding the orifice 90a, in the space between the outer casing 110 and the outer ring 90. - the candle 150 which passes through the openings 90a, 110a, the candle adapter 160, the chimney 200 and the candle guide 190, to open into the space 290.
    [0008] The candle adapter 160, which therefore extends out of the combustion chamber 30, is fixed (typically screwed) externally to the outer casing 110, around the opening 110a; see the bindings symbolized in 161 figure 2. A joint 163 is interposed between them. Unlike the solution described in connection with Figure 1, wherein the candle adapter 16 comprises a cylindrical housing, a part of which is threaded and in which the candle is retained by screwing, the candle 150 passes freely (without screwing) through the 160 candle adapter, but is against against screwed (unscrewable) with the candle guide 190, where it passes through.
    [0009] Screwing the candle in this environment seemed a priori not appropriate because of the proximity with the hottest areas and where the thermal gradients are the strongest, and therefore a potential problem including unscrewing for replacement of this candle. Screwing the candle not directly on the chimney 200, but on (in) the candle guide 190 has proved to be the solution, in particular because of the already known movement capacity of the guide-candle relative to the chimney, and therefore to the outer shell, while having a relative movement capacity between the candle and the candle adapter. Thus, the preferred solution of Figure 2 passes through: - a free mounting of the candle through the candle adapter 160, being specified that this assembly is however guided transversely to the axis 150a of assembly / disassembly of this candle (see below two possible solutions), and inner and outer threads 103,105 respectively in the guide-candle (tapping of the flange 190a) and around the candle, a little 15 back of his nose 151 which leads into the volume 290 and carries the (the) electrode (s), these threads being screwed together to stabilize substantially radially to the axis 30a the spark plug, with respect to the outer longitudinal wall 90. Thus, it is possible, in operation, to aim a radial position zo substantially constant nose of the candle relative to and raz of this outer shell 90, which did not allow the solution of Figure 1 with the screw on the candle adapter. FIG. 8 shows, moreover, that, in order to be able to follow the fairly varied movements of 25 pieces between them which can occur in the zone in question here, depending on the operating conditions (in FIG. ground, in flight, at different engine speeds ...), the spark plug 1 (supplied with electrical energy by the cable 152, FIG. 7) and the spark plug guide 190 are mounted with a certain freedom relative to the outer casing 110, following a direction 107 substantially radial to the axis of the second opening.
    [0010] This allows in particular to follow without undue stress the expansion between the outer ring 90 and the outer casing 110. In operation, the combustion chamber is under pressure. In particular for a gas seal between the front and the back of the candle, inside the candle adapter 160, the latter has an inner rim 165 and the candle is provided with a flange 153 which surrounds locally (transverse to the axis 150a) and which comes, candle in place, in front of the inner rim 165. At least one seal 170 is disposed in abutment between the rim 165 and the flange and preferably mounted compressed by this candle . To perfect sealing and control of the authorized movements of the candle, it is preferable to mount the flange 153 between two inner flanges 165a, 165b and provide two deformable seals 170a, 170b disposed on either side of the flange. Thus when, due to a relative movement, along the axis 150a, between the candle and the candle adapter 160, and as a result a seal will relax, the other seal will be compressed, which will allow seal in all circumstances. Favorably, the two joints will be balanced in a way, like the candle, to transmit no radial force to the room assembly.
    [0011] Despite the flange 153 and seal (s) 170, minor leaks around the flange may occur. Also, to overcome this and allow to cool the candle from above (rear), it is proposed that the candle adapter 160 has towards its (second) rear end air passage holes 179 between the interior and the outside of this candle adapter To facilitate in particular the assembly / disassembly of the candle, it is further recommended that the candle adapter 160 has along the axis 150a, first and second parts 160a, 160b related for to be mounted together and disassembled vis-à-vis the other substantially along the axis of the second opening 110a of the outer casing (and therefore along the axis 150a), preferably in a zone 167 surrounding the (s) ) seal (s) and the flange 153. Favorably, at the location of this area the parts 160a, 160b will present means 169 providing a removable attachment between them, along the axis 150a. Threads on cylindrical portions of the two parts 160a, 160b would be particularly suitable. It will be preferred that the area of the joint (s) and the flange 153, and therefore the zone 167, be located radially outward (therefore behind) of the zone 171 where the In this regard, it will be preferred that the spark plug 150 and the spark plug adapter are provided with centerings 173, 175 for positioning the spark plug in the adapter substantially radially to the axis of the spark plug. the second opening 110a and to limit the vibrations of the candle in operation. Guides also facilitate the mounting of the candle in the adapter. The candle being "consumable", to be changed periodically, the centering means 173 on the candle will favorably a bead projecting around this candle. And it may prove useful that, with the candle mounted, the spark plug adapter 160 has an internal section restriction forming the centering 175. An advantage of 173,175 cylindrical centerings, coaxial with the axis of the second opening 110a, is to be able to ensure a relatively long surface area and to block the tilting of the candle and / or limit vibration.
    [0012] A derivative solution shown in FIG. 7 may however consist in providing a spherical bearing 177 and in increasing the clearance transverse to the axis 150a between the spark plug and the spark plug adapter, in this case the upper or the rear portion 160b, in order to limit the hyperstatism and give more flexibility to the candle in case of tilting of the faired area 29 of the room. Again inasmuch as the candle is "a consumable", a spherical flange 177 will preferably be provided on the candle and a cylindrical centering 175 facing the candle adapter 160 will be maintained. vibrations of the candle around its spherical scope and acceleration of wear of the latter can be considered crippling.
    [0013] To enlarge the air circulation zone (holes 179) but also to bring the bearing and flange zones axially together, for the sake of compactness, it is recommended that, along the axis 150a, the length L1 be less than that L2 of the second part 160b (see Figure 7). Figures 8-10, three operating situations are illustrated, showing that there may be movements and / or relative efforts both axial (parallel to the axis 30a arrows 107) that radial (arrow 109). With reference to a reference position assumed to be that of FIG. 8, FIGS. 8-9 show clearly the compression / expansion movements of the seal (s) 170 and of the tilting of the candle and of the spark plug 190 (Angle A) relative to the outer casing 110 and the outer shell 90. It will be noted that the outer casing 110 has been assumed fixed (reference) and the outer shell 90 movable relative thereto. In practice both can be moved. A constant is against that the front (or the nose) 15a of candle remains positioned flush with the inner face of the outer shell 90 and therefore the internal volume 29 of the combustion chamber. In relation to point and, as already explained, in order to limit as much as possible the efforts that the candle can exert on the outer shell under certain conditions, in particular in the radial and / or axial expansion phases of the walls of the inner chamber of the combustion chamber relative to the housing, it is proposed that between the candle guide 190 and the wall 201 (see Figure 2) of the chimney (or annular boss) 200 of the outer longitudinal wall 90 is interposed a means 210 of substantially axial sliding (thus substantially parallel to the axis 30a), such as ball bearings.
    [0014] The potentially critical forces tending, excluding axial expansion, especially to bring the walls 90 and 110 radially closer, the substantially axial sliding means 210 will preferably be placed on the internal face 191 a of the flange 190 a of the guide-plug (see FIG. 2).
    [0015] Thus, it will best promote the axial sliding of the candle guide 190 in the radial expansion and axial expansion of the volume 290 relative to the housing where the candle can exert a radial force on the (the) ferrules. For its maintenance and guidance, the flange 190a will evolve in a volume defined by the peripheral walls and respectively upper and lower of the chimney 200 (as already known). Even more so if the sliding means 210, such as ball bearings or low-friction contact materials are provided, it will be necessary to avoid that the screwing / unscrewing of the spark plug, via the threads 103, 105 may be delicate, the guide-candle 190 likely to turn on itself. Also it is expected that anti-rotation means 180, such as a stop, (Figure 3) limits the free rotation of the candle guide 190 relative to the chimney 200, about the axis 150a.
    [0016] The abutment 180 may comprise a tab 181 traversing with a certain clearance a slot 183 of the chimney. Before quickly presenting how to mount the candle and candle adapter 160, we will note among the contributions of the solution presented here, the possibilities offered: - to reduce the heating of the nose of the candle, - to increase the life of the spark plug, - to promote the ignition capacity on the ground and in flight. Regarding this assembly, one can proceed as follows, with reference to Figures 4-6, being assumed the candle guide 190 with its threaded thread 103 already in place in the chimney 200: - First, implementation of the first part (radially inner) 160a of the spark plug adapter on the outer casing 110: the adapter is fixed by the screws 161 on a deck of the housing, with the interposition of the seal 163; 4, then placing, in the centering zone 167, the radially inner seal 170b and then, above, the flange 153 of the spark plug, then screwing the nose of the spark plug into the threaded bore of the guide. candle. The anti-rotation tab of the spark plug acts. Favorably this operation will also allow the collar 153 to slightly compress the seal 170b to promote sealing; FIG. 5, positioning, in the centering zone 167, of the second seal 170a over the flange 153 and screwing together, around the spark plug, the two parts 160a, 160b of the adapter. This operation also allows the second portion 160b to compress slightly, in the axis 150a, the seal 170a, for sealing; In the end, the nose 15a is then flush with the outer limit (wall 90) of the internal volume 290 of the combustion chamber, as desired and shown in FIG. 6. As regards the application to a turbomachine 1 (in particular turbojet or turboprop) of the assembly 100 comprising the candle 150 and its device 130 for radial attachment, their implementation in Figure 1, in substitution of the device 13, must improve its operation as mentioned above.
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. Assembly comprising a turbomachine plug and a device (130) for radial fixing of this spark plug to the turbomachine, which comprises: - a combustion chamber (30) having a longitudinal axis (30a) and comprising: - a device (5) for injecting air and fuel, - an inner longitudinal wall (7) and an outer longitudinal wall (90) having a first opening (90a) substantially transverse to said axis, - an outer casing (110) presenting a second opening (110a) also substantially transverse to the axis of the combustion chamber, - the device (130) for fixing the spark plug (150), which device 15 comprises: - a candle adapter (160) fixed to a first end to the outer casing, facing the second opening and through which passes the candle considered, and - a candle guide (190) maintained in contact with the outer longitudinal wall 20, opposite the first opening (90a) and to through which it passes the spark plug to open into the combustion chamber (30), this assembly being characterized in that the spark plug (150) and the spark plug (190) each have a thread (103, 105), the threads being screwed together, in order to radially stabilize the axis (30a) of the combustion chamber the spark plug, with respect to said outer longitudinal wall (90).
    [0002]
    2. An assembly according to claim 1, characterized in that the spark plug and the spark plug guide (190) are mounted freely relative to the outer casing (110) in a direction substantially radial to the axis of the second opening (110a). .
    [0003]
    3. An assembly according to claim 1 or 2, characterized in that the guide-plug is mounted in a housing located between the outer longitudinal wall (90) and the outer casing (110) and between the candle guide (190) and the concerned wall of the annular boss (200) of the outer longitudinal wall is interposed means (210) for substantially axial sliding, such as ball bearings.
    [0004]
    4. An assembly according to one of claims 1 to 3, characterized in that the candle adapter (160) has towards a second end opposite the first end of the holes (179) of air passage between the inside and the outside of the candle adapter.
    [0005]
    5. Assembly according to one of claims 1 to 4, characterized in that, in the candle adapter (160), the candle is provided with a flange (153) which surrounds it locally and is connected with the at least one seal (170; 170a, 170b) disposed in abutment between an inner flange (165; 165a, 165b) of the candle adapter and the flange.
    [0006]
    6. The assembly of claim 5, characterized in that first and second deformable seals (170a, 170b) are arranged on either side of the flange, for airtightness, on both sides of the said flange.
    [0007]
    7. Assembly according to one of claims 1 to 6, characterized in that the candle adapter has first and second parts (160a, 160b) connected to be mounted together, for example by screwing, and disassembled one of them. vis-à-vis the other substantially parallel to the axis of the second opening (110a) of the outer casing.
    [0008]
    8. Assembly according to one of claims 1 to 7, characterized in that the candle and the candle adapter are provided with centering (173,175,177) comprising a bead (173,177) around the candle.
    [0009]
    9 assembly according to claim 8, characterized in that the centerings (173,175, 177) comprise a spherical bearing (177) around the candle. Turbomachine comprising the assembly according to one of claims 1 to 9, including the combustion chamber (30) with the outer casing (90).
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    同族专利:
    公开号 | 公开日
    US9982603B2|2018-05-29|
    GB2538638A|2016-11-23|
    GB201610578D0|2016-08-03|
    FR3015642B1|2018-03-02|
    GB2538638B|2020-11-18|
    WO2015097355A1|2015-07-02|
    US20160369701A1|2016-12-22|
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    法律状态:
    2015-12-01| PLFP| Fee payment|Year of fee payment: 3 |
    2016-12-05| PLFP| Fee payment|Year of fee payment: 4 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 5 |
    2018-02-02| CD| Change of name or company name|Owner name: SAFRAN AIRCRAFT ENGINES, FR Effective date: 20170719 |
    2018-11-27| PLFP| Fee payment|Year of fee payment: 6 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 7 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 8 |
    2021-11-18| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1363487A|FR3015642B1|2013-12-23|2013-12-23|TURBOMACHINE CANDLE AND RADIAL FASTENING DEVICE|
    FR1363487|2013-12-23|FR1363487A| FR3015642B1|2013-12-23|2013-12-23|TURBOMACHINE CANDLE AND RADIAL FASTENING DEVICE|
    PCT/FR2014/053037| WO2015097355A1|2013-12-23|2014-11-26|Turbomachine sparkplug fixing assembly|
    US15/106,162| US9982603B2|2013-12-23|2014-11-26|Turbomachine sparkplug fixing assembly|
    GB1610578.5A| GB2538638B|2013-12-23|2014-11-26|Turbomachine sparkplug fixing assembly|
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