EP3695102A1 - Labyrinth seal comprising a lip provided with a deflector - Google Patents

Labyrinth seal comprising a lip provided with a deflector

Info

Publication number
EP3695102A1
EP3695102A1 EP18821725.1A EP18821725A EP3695102A1 EP 3695102 A1 EP3695102 A1 EP 3695102A1 EP 18821725 A EP18821725 A EP 18821725A EP 3695102 A1 EP3695102 A1 EP 3695102A1
Authority
EP
European Patent Office
Prior art keywords
wiper
face
labyrinth seal
tangential direction
deflector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18821725.1A
Other languages
German (de)
French (fr)
Other versions
EP3695102B1 (en
Inventor
Bertrand Guillaume Robin PELLATON
Lucas BENASSIS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Helicopter Engines SAS
Original Assignee
Safran Helicopter Engines SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Safran Helicopter Engines SAS filed Critical Safran Helicopter Engines SAS
Priority to PL18821725T priority Critical patent/PL3695102T3/en
Publication of EP3695102A1 publication Critical patent/EP3695102A1/en
Application granted granted Critical
Publication of EP3695102B1 publication Critical patent/EP3695102B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
    • 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
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • 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
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
    • F01D11/127—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with a deformable or crushable structure, e.g. honeycomb
    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
    • F01D5/225—Blade-to-blade connections, e.g. for damping vibrations by shrouding
    • 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

Definitions

  • the subject of the present invention is a labyrinth seal comprising a wiper with a deflector.
  • the labyrinth seals are well known and of a very common use in aeronautics for example. They tolerate a small leakage flow through them. They are normally used to separate chambers containing gases at different pressures, succeeding one another along a rotor and a stator facing the rotor, or more generally two structures in relative rotation.
  • the labyrinth seals referred to herein comprise a base attached to one of the structures and carrying at least one wiper, ie a circular ridge rising from the base and of which the top is directed towards the other structures, which can carry a seal such as a honeycomb, very close to the top of the wiper, or another so-called abradable material that the wiper can easily erode when the clearance disappears, in the case of differential thermal expansions, for example between the rotor and the stator, or during sudden accelerations generating large centrifugal displacements.
  • the leakage rate is reduced by the narrowness of the clearance between the top of the wiper and the lining of the opposite seal, as well as by the sudden variation of section offered to the leakage flow, that produces the wiper. This sudden variation effect is reinforced in the usual case where several wipers succeed one another along the direction of flow.
  • Document FR 2 825 411 A1 describes a wiper composed of segments whose height (in the radial direction) is variable; EP 2 116 692 A2, wipers which can be composed of curved segments in the axial direction of the rotor; US 6,478,304 B1, a wiper provided with cutting elements projecting from the side faces and the top face of the wiper; and FR 2 963 403 A1, wipers provided with side deflectors, but on a stator.
  • the fundamental object of the present invention is to further reduce the leakage rates through the labyrinth seals, by means of an innovation in the design of the wipers.
  • a general aspect of the invention is a labyrinth seal of a turbomachine, the seal comprising at least one wiper standing on a base of a rotor of the turbomachine, the wiper being circular while extending along a said tangential direction, comprising two lateral faces each connected to the base and, at an end opposite the base, to a top face of the wiper, wherein at least one of the side faces carries at least one baffle comprising a secant deflecting face at said lateral face and having an inclination with respect to the tangential direction. And the inclination of the deflecting face with respect to the tangential direction is increasing when approaching the crown face, the deflecting face thus being concave.
  • the deflector is a projecting structure on a lateral side of the wiper and having a so-called deflecting face directed in the tangential direction of the rotor so as to intercept a portion of the flow having locally a direction with a preponderant radial component since it flows along this lateral side of the wiper, to deflect it by increasing its tangential component, so as to disturb the leakage flow in the direction mainly axial and perpendicular, and thus reduce its flow.
  • the concavity of the deflecting face increases the particularly beneficial tangential component.
  • the deflector is repeated on the wiper with regular angular steps in the tangential direction; the wiper is movable in the tangential direction and the deflecting face is directed in a direction of movement of the wiper;
  • the deflecting face being from the base to the summit face
  • the lateral face carrying the deflector is directed upstream of a flow passing through the labyrinth seal in an axial direction perpendicular to the tangential direction;
  • the wiper is inclined from the base, upstream of a flow through the labyrinth seal in an axial direction perpendicular to the tangential direction.
  • FIG. 5 illustrates the flow prevailing in the joint.
  • Figures 1 and 2 show a conventional labyrinth seal, in axial section and in cross section.
  • a rotor shaft 1 extending in an axial direction X of a turbomachine is surrounded by a stator 2.
  • the labyrinth seal 3 comprises a seal 4, which can assume the appearance of a honeycomb, fixed to the stator 2, and wipers 5 standing on a base 6 fixed to the rotor 1.
  • the wipers 5 stand in a radial direction R of the machine and extend in a tangential direction T, these three directions being perpendicular to each other .
  • the stator 2 and the seal 4 are annular, the wipers 5 are circular around the central axis of the machine.
  • the wipers 5 are each delimited by two lateral faces 7 and 8 connected to the base 6, and by a crown face 9, which may be a simple edge, connecting to the opposite ends of the lateral faces 7 and 8.
  • the seal labyrinth 3 separates two gas chambers 10 and 11 succeeding one another along the rotor 1 and defined by it and by the stator 2. If one of the enclosures 10 is at a higher pressure than the other, a leakage flow 12 is established at through the labyrinth seal S, through the clearances between the top faces 9 of the wipers 5 and the seal 4.
  • the side face 7 is directed upstream of the leakage flow 12, and the face lateral 8 downstream for each of the wipers 5.
  • the wipers 5 are provided at least at one of their lateral faces, in particular at the lateral face 7 directed upstream of the leakage flow 12, deflectors 13 may consist of platelets and anyway including a secant deflector face 14 to the side face 7 on which the deflectors are installed, and directed in the direction of movement T + of the rotor 1 in the tangential direction T.
  • the deflectors 13 may be installed at regular angular steps by the tangential direction T along the wiper 5.
  • the deflector faces 14 are inclined relative to the tangential direction T, that is to say they extend over at least a portion of the height of the wiper 5 between the base 6 and the crown face 9 in the radial direction R, and advantageously over this entire height.
  • This inclination is variable, lower near the base 6 (that is to say that the deflecting face 13 is almost horizontal on the tangential direction T) and then increasing constantly, approaching the vertex face 9 (that is, the angle with the radial direction R decreases continuously): the deflector face 14 is concave.
  • the effect of the deflector 13 can be explained as follows.
  • the leakage flow 12 takes a vortex shape 15 in front of the wiper 5, especially if the wiper 5 is preceded by another of the same nature, delimiting a cavity 16 for forming the vortex 15.
  • the vortex regions 15 which are close the wiper 5 receive from it a significant tangential component of speed imposed by the movement of the rotor 1.
  • the fraction of the leakage flow 12 candidate to cross the wiper 5 thus undergoes a collision with this gas deflected by the deflectors 13, and which therefore has a component radial and a significant tangential component.
  • the flow fraction is then disturbed, which reduces the leakage rate through the wiper 5.
  • the tangential component, favored by the change of inclination of the deflector 13, is considered more useful for producing this effect.
  • the radial component imposed on the gas intercepted by the deflectors 13 is here centrifugal, the rotor 1 being central and surrounded by the stator 2 (or more generally by the carrier body of the seal 4).
  • An inverse arrangement would be possible, the wiper-bearing rotor surrounding the stator, and the deflectors would then carry wipers placed to impose a centripetal radial component to the gas.
  • Deflectors 13 ' (FIG. 3) could still be placed on the lateral face 8 of the wipers directed downstream of the leakage flow 12, in addition to or instead of the deflectors 13 described here; their shape could be identical.
  • the wipers 5 could be inclined axially without change for the invention, as shown in Figure 5 (where they are inclined upstream of the leakage flow 12 from the base 6) , or straight lines (standing in a purely radial direction), as shown in Figure 3; the inclination of the lateral faces 7 and 8 in the axial direction is also not a critical parameter.
  • the number of deflectors 13 in the angular direction may be a few tens, or greater than a hundred for example, with an angular pitch ranging from 2 ° to 10 °.
  • the angular pitch of the deflectors 13 may be identical to that of the blades .

Abstract

A labyrinth seal lip (5) comprises, standing on one of its lateral faces (7), a deflector (13) which channels the flow of gas tangent to the lip (5) towards the facing seal (4) so as to disturb the leakage flow (22) through the gap and decrease the flow rate.

Description

JOINT A LABYRINTHE COMPRENANT UNE LECHETTE DOTEE D'UN DEFLECTEUR  LABYRINK JOINT COMPRISING A LETTER WITH A DEFLECTOR
DESCRIPTION DESCRIPTION
Le sujet de l'invention présente est un joint à labyrinthe comprenant une léchette dotée d'un déflecteur. The subject of the present invention is a labyrinth seal comprising a wiper with a deflector.
Les joints à labyrinthe sont bien connus et d'un emploi très courant dans l'aéronautique par exemple. Ils tolèrent un petit débit de fuite à travers eux. Ils servent normalement à séparer des enceintes contenant des gaz à des pressions différentes, se succédant le long d'un rotor et d'un stator en regard du rotor, ou plus généralement de deux structures en rotation relative. Les joints à labyrinthe dont il est question ici comprennent une embase fixée à l'une des structures et porteuse d'au moins une léchette, c'est-à-dire d'une crête circulaire se dressant à partir de l'embase et dont le sommet est dirigé vers l'autre des structures, qui peut porter une garniture d'étanchéité telle qu'un nid d'abeille, très proche du sommet de la léchette, ou une autre matière dite abradable que la léchette peut facilement éroder quand le jeu disparaît, en cas de dilatations thermiques différentielles par exemple entre le rotor et le stator, ou au cours d'accélérations brutales générant des déplacements centrifuges importants. Le débit de fuite est diminué par l'étroitesse du jeu entre le sommet de la léchette et la garniture de l'étanchéité en regard, ainsi que par la variation brusque de section offerte à l'écoulement de fuite, que produit la léchette. Cet effet de variation brusque est renforcé dans le cas usuel où plusieurs léchettes se succèdent le long de la direction d'écoulement.  The labyrinth seals are well known and of a very common use in aeronautics for example. They tolerate a small leakage flow through them. They are normally used to separate chambers containing gases at different pressures, succeeding one another along a rotor and a stator facing the rotor, or more generally two structures in relative rotation. The labyrinth seals referred to herein comprise a base attached to one of the structures and carrying at least one wiper, ie a circular ridge rising from the base and of which the top is directed towards the other structures, which can carry a seal such as a honeycomb, very close to the top of the wiper, or another so-called abradable material that the wiper can easily erode when the clearance disappears, in the case of differential thermal expansions, for example between the rotor and the stator, or during sudden accelerations generating large centrifugal displacements. The leakage rate is reduced by the narrowness of the clearance between the top of the wiper and the lining of the opposite seal, as well as by the sudden variation of section offered to the leakage flow, that produces the wiper. This sudden variation effect is reinforced in the usual case where several wipers succeed one another along the direction of flow.
Si un débit de fuite est toléré et inévitable avec les joints à labyrinthe, on s'efforce toujours de le diminuer, en recourant, entre autre, à des formes particulières des léchettes. A l'art antérieur du domaine technique appartiennent les documents FR 2 980 234 A et FR 2 825411 A, qui illustrent l'utilisation très fréquente des joints à labyrinthe à l'extrémité libre d'aubes de turbomachines, et, pour le dernier d'entre eux, une construction particulière des léchettes en dents de scie se succédant dans la direction tangentielle, afin de faciliter l'entame de la garniture par les léchettes, en absorbant moins de puissance du rotor, quand le jeu entre elles et les léchettes disparaît. Le document FR 2 825 411 Al décrit une léchette composée de segments dont la hauteur (en direction radiale) est variable ; EP 2 116 692 A2, des léchettes pouvant être composées de segments incurvés en direction axiale du rotor ; US 6 478 304 Bl, une léchette pourvue d'éléments de coupe saillant des faces latérales et de la face de sommet de la léchette ; et FR 2 963 403 Al, des léchettes pourvues de déflecteurs latéraux, mais sur un stator. If a leakage flow is tolerated and inevitable with labyrinth seals, it is always endeavored to reduce it, by resorting, inter alia, to particular forms of wipers. To the prior art of the technical field belong the documents FR 2 980 234 A and FR 2 825411 A, which illustrate the very frequent use of labyrinth seals at the free end of turbine engine blades, and for the last one between them, a particular construction of the sawtooth teeth succeeding one another in the tangential direction, in order to facilitate the opening of the lining by the wipers, absorbing less power of the rotor, when the play between them and the darts disappears . Document FR 2 825 411 A1 describes a wiper composed of segments whose height (in the radial direction) is variable; EP 2 116 692 A2, wipers which can be composed of curved segments in the axial direction of the rotor; US 6,478,304 B1, a wiper provided with cutting elements projecting from the side faces and the top face of the wiper; and FR 2 963 403 A1, wipers provided with side deflectors, but on a stator.
L'objet fondamental de l'invention présente est de réduire encore les débits de fuite traversant les joints à labyrinthe, au moyen d'une innovation dans le dessin des léchettes.  The fundamental object of the present invention is to further reduce the leakage rates through the labyrinth seals, by means of an innovation in the design of the wipers.
Un aspect général de l'invention est un joint à labyrinthe d'une turbomachine, le joint comprenant au moins une léchette se dressant sur une embase d'un rotor de la turbomachine, la léchette étant circulaire en s'étendant le long d'une direction dite tangentielle, comprenant deux faces latérales se raccordant chacune à l'embase et, à une extrémité opposée à l'embase, à une face de sommet de la léchette, où l'une au moins des faces latérales porte au moins un déflecteur comprenant une face déflectrice sécante à ladite face latérale et présentant une inclinaison par rapport à la direction tangentielle. Et l'inclinaison de la face déflectrice par rapport à la direction tangentielle est croissante en s'approchant de la face de sommet, la face déflectrice étant ainsi concave.  A general aspect of the invention is a labyrinth seal of a turbomachine, the seal comprising at least one wiper standing on a base of a rotor of the turbomachine, the wiper being circular while extending along a said tangential direction, comprising two lateral faces each connected to the base and, at an end opposite the base, to a top face of the wiper, wherein at least one of the side faces carries at least one baffle comprising a secant deflecting face at said lateral face and having an inclination with respect to the tangential direction. And the inclination of the deflecting face with respect to the tangential direction is increasing when approaching the crown face, the deflecting face thus being concave.
Le déflecteur est une structure saillant sur un côté latéral de la léchette et possédant une face, dite déflectrice, dirigée en direction tangentielle du rotor de manière à intercepter une partie de l'écoulement ayant localement une direction avec une composante radiale prépondérante puisqu'il s'écoule le long de ce côté latéral de la léchette, pour le dévier en accroissant sa composante tangentielle, de manière à perturber l'écoulement de fuite dans la direction principalement axiale et perpendiculaire, et donc à réduire son débit. La concavité de la face déflectrice accroît la composante tangentielle particulièrement bénéfique.  The deflector is a projecting structure on a lateral side of the wiper and having a so-called deflecting face directed in the tangential direction of the rotor so as to intercept a portion of the flow having locally a direction with a preponderant radial component since it flows along this lateral side of the wiper, to deflect it by increasing its tangential component, so as to disturb the leakage flow in the direction mainly axial and perpendicular, and thus reduce its flow. The concavity of the deflecting face increases the particularly beneficial tangential component.
Selon certaines formes préférées de l'invention :  According to certain preferred forms of the invention:
- le déflecteur est répété sur la léchette à pas angulaires réguliers dans la direction tangentielle ; - la léchette est mobile dans la direction tangentielle et la face déflectrice est dirigée dans un sens de mouvement de la léchette ; the deflector is repeated on the wiper with regular angular steps in the tangential direction; the wiper is movable in the tangential direction and the deflecting face is directed in a direction of movement of the wiper;
- la face déflectrice étant depuis l'embase jusqu'à la face de sommet ; the deflecting face being from the base to the summit face;
- la face latérale portant le déflecteur est dirigée vers un amont d'un écoulement traversant le joint à labyrinthe dans une direction axiale perpendiculaire à la direction tangentielle ; the lateral face carrying the deflector is directed upstream of a flow passing through the labyrinth seal in an axial direction perpendicular to the tangential direction;
- la léchette est inclinée à partir de l'embase, vers un amont d'un écoulement traversant le joint à labyrinthe dans une direction axiale perpendiculaire à la direction tangentielle.  - The wiper is inclined from the base, upstream of a flow through the labyrinth seal in an axial direction perpendicular to the tangential direction.
Ces différentes modifications et améliorations possibles permettent toutes de renforcer l'effet de la disposition générale.  These various modifications and possible improvements all make it possible to reinforce the effect of the general arrangement.
L'invention sera maintenant décrite en détail à l'aide des figures suivantes, qui représentent une réalisation particulière, annexées à titre purement illustratif :  The invention will now be described in detail with the aid of the following figures, which represent a particular embodiment, appended for purely illustrative purposes:
- les figures 1 et 2 représentent un joint à labyrinthe usuel en coupe axiale et coupe transversale ;  - Figures 1 and 2 show a labyrinth seal usual in axial section and cross section;
- les figures 3 et 4, un joint modifié d'après l'invention, encore en coupe axiale et coupe transversale ;  - Figures 3 and 4, a seal modified according to the invention, still in axial section and cross section;
- et la figure 5 illustre l'écoulement régnant dans le joint.  and FIG. 5 illustrates the flow prevailing in the joint.
Les figures 1 et 2 représentent un joint à labyrinthe classique, en coupe axiale et en coupe transversale. Un arbre de rotor 1 s'étendant dans une direction axiale X d'une turbomachine est entouré par un stator 2. Le joint à labyrinthe 3 comprend une garniture d'étanchéité 4, pouvant prendre l'aspect d'un nid d'abeille, fixée au stator 2, et des léchettes 5 se dressant sur une embase 6 fixée au rotor 1. Les léchettes 5 se dressent dans une direction radiale R de la machine et s'étendent dans une direction tangentielle T, ces trois directions étant perpendiculaires entre elles. Le stator 2 et la garniture d'étanchéité 4 sont annulaires, les léchettes 5 sont circulaires autour de l'axe central de la machine. Les léchettes 5 sont chacune délimitées par deux faces latérales 7 et 8 se raccordant à l'embase 6, et par une face de sommet 9, pouvant être une simple arête, se raccordant aux extrémités opposées des faces latérales 7 et 8. Le joint à labyrinthe 3 sépare deux enceintes de gaz 10 et 11 se succédant le long du rotor 1 et délimitées par lui et par le stator 2. Si une des enceintes 10 est à une pression plus importante que l'autre, il s'instaure un écoulement de fuite 12 à travers le joint à labyrinthe S, à travers les jeux compris entre les faces de sommets 9 des léchettes 5 et la garniture d'étanchéité 4. La face latérale 7 est dirigée vers l'amont de l'écoulement de fuite 12, et la face latérale 8 vers l'aval pour chacune des léchettes 5. Figures 1 and 2 show a conventional labyrinth seal, in axial section and in cross section. A rotor shaft 1 extending in an axial direction X of a turbomachine is surrounded by a stator 2. The labyrinth seal 3 comprises a seal 4, which can assume the appearance of a honeycomb, fixed to the stator 2, and wipers 5 standing on a base 6 fixed to the rotor 1. The wipers 5 stand in a radial direction R of the machine and extend in a tangential direction T, these three directions being perpendicular to each other . The stator 2 and the seal 4 are annular, the wipers 5 are circular around the central axis of the machine. The wipers 5 are each delimited by two lateral faces 7 and 8 connected to the base 6, and by a crown face 9, which may be a simple edge, connecting to the opposite ends of the lateral faces 7 and 8. The seal labyrinth 3 separates two gas chambers 10 and 11 succeeding one another along the rotor 1 and defined by it and by the stator 2. If one of the enclosures 10 is at a higher pressure than the other, a leakage flow 12 is established at through the labyrinth seal S, through the clearances between the top faces 9 of the wipers 5 and the seal 4. The side face 7 is directed upstream of the leakage flow 12, and the face lateral 8 downstream for each of the wipers 5.
Selon l'invention (figures B, 4 et 5), les léchettes 5 sont pourvues au moins à l'une de leurs faces latérales, notamment à la face latérale 7 dirigée vers l'amont de l'écoulement de fuite 12, de déflecteurs 13 pouvant consister en plaquettes et comprenant de toute façon une face déflectrice 14 sécante à la face latérale 7 sur laquelle les déflecteurs sont installés, et dirigée dans le sens de mouvement T+ du rotor 1 dans la direction tangentielle T. Les déflecteurs 13 peuvent être installés à pas angulaires réguliers par la direction tangentielle T le long de la léchette 5. Les faces déflectrices 14 sont inclinées par rapport à la direction tangentielle T, c'est-à-dire qu'elles s'étendent sur au moins une partie de la hauteur de la léchette 5 entre l'embase 6 et la face de sommet 9 dans la direction radiale R, et avantageusement sur toute cette hauteur. Cette inclinaison est variable, plus faible près de l'embase 6 (c'est-à-dire que la face déflectrice 13 est presque horizontale sur la direction tangentielle T) et croissant ensuite sans cesse, en s'approchant de la face de sommet 9 (c'est-à-dire que l'angle avec la direction radiale R diminue sans cesse) : la face déflectrice 14 est concave. According to the invention (Figures B, 4 and 5), the wipers 5 are provided at least at one of their lateral faces, in particular at the lateral face 7 directed upstream of the leakage flow 12, deflectors 13 may consist of platelets and anyway including a secant deflector face 14 to the side face 7 on which the deflectors are installed, and directed in the direction of movement T + of the rotor 1 in the tangential direction T. The deflectors 13 may be installed at regular angular steps by the tangential direction T along the wiper 5. The deflector faces 14 are inclined relative to the tangential direction T, that is to say they extend over at least a portion of the height of the wiper 5 between the base 6 and the crown face 9 in the radial direction R, and advantageously over this entire height. This inclination is variable, lower near the base 6 (that is to say that the deflecting face 13 is almost horizontal on the tangential direction T) and then increasing constantly, approaching the vertex face 9 (that is, the angle with the radial direction R decreases continuously): the deflector face 14 is concave.
L'effet du déflecteur 13 peut être expliqué comme suit. L'écoulement de fuite 12 prend une forme de tourbillon 15 devant la léchette 5, surtout si la léchette 5 est précédée par une autre de même nature, en délimitant une cavité 16 de formage du tourbillon 15. Les régions du tourbillon 15 qui sont proches de la léchette 5 reçoivent d'elle une composante tangentielle importante de vitesse qu'impose le mouvement du rotor 1. En arrivant devant la face déflectrice 14 d'un des déflecteurs 13, ils sont canalisés par celle- ci et leur direction est infléchie en donnant une composante de vitesse radiale importante dirigée vers la garniture d'étanchéité 4. La fraction de l'écoulement de fuite 12 candidate à franchir la léchette 5 subit donc une collision avec ce gaz dévié par les déflecteurs 13, et qui possède donc une composante radiale et une composante tangentielle importantes. La fraction d'écoulement est alors perturbée, ce qui réduit le débit de fuite à travers la léchette 5. La composante tangentielle, favorisée par le changement d'inclinaison du déflecteur 13, est considérée comme plus utile pour produire cet effet. The effect of the deflector 13 can be explained as follows. The leakage flow 12 takes a vortex shape 15 in front of the wiper 5, especially if the wiper 5 is preceded by another of the same nature, delimiting a cavity 16 for forming the vortex 15. The vortex regions 15 which are close the wiper 5 receive from it a significant tangential component of speed imposed by the movement of the rotor 1. When arriving in front of the deflector face 14 of one of the deflectors 13, they are channeled by it and their direction is inflected by giving a significant radial velocity component directed towards the seal 4. The fraction of the leakage flow 12 candidate to cross the wiper 5 thus undergoes a collision with this gas deflected by the deflectors 13, and which therefore has a component radial and a significant tangential component. The The flow fraction is then disturbed, which reduces the leakage rate through the wiper 5. The tangential component, favored by the change of inclination of the deflector 13, is considered more useful for producing this effect.
La composante radiale imposée au gaz intercepté par les déflecteurs 13 est ici centrifuge, le rotor 1 étant central et entourée par le stator 2 (ou plus généralement par le corps porteur de la garniture d'étanchéité 4). Une disposition inverse serait possible, le rotor porteur des léchettes entourant le stator, et les déflecteurs seraient alors porteurs des léchettes placées pour imposer une composante radiale centripète au gaz.  The radial component imposed on the gas intercepted by the deflectors 13 is here centrifugal, the rotor 1 being central and surrounded by the stator 2 (or more generally by the carrier body of the seal 4). An inverse arrangement would be possible, the wiper-bearing rotor surrounding the stator, and the deflectors would then carry wipers placed to impose a centripetal radial component to the gas.
Des déflecteurs 13' (figure 3) pourraient encore être placés sur la face latérale 8 des léchettes dirigée vers l'aval de l'écoulement de fuite 12, en sus ou en remplacement des déflecteurs 13 décrit ici ; leur forme pourrait être identique.  Deflectors 13 '(FIG. 3) could still be placed on the lateral face 8 of the wipers directed downstream of the leakage flow 12, in addition to or instead of the deflectors 13 described here; their shape could be identical.
Les léchettes 5 pourraient être inclinées en direction axiale sans changement pour l'invention, ce qu'on a représenté à la figure 5 (où elles sont inclinées vers l'amont de l'écoulement de fuite 12 à partir de l'embase 6), ou droites (se dressant en direction purement radiale), ce qu'on a représenté à la figure 3 ; l'inclinaison des faces latérales 7 et 8 dans la direction axiale n'est pas non plus un paramètre critique.  The wipers 5 could be inclined axially without change for the invention, as shown in Figure 5 (where they are inclined upstream of the leakage flow 12 from the base 6) , or straight lines (standing in a purely radial direction), as shown in Figure 3; the inclination of the lateral faces 7 and 8 in the axial direction is also not a critical parameter.
Le nombre des déflecteurs 13 en direction angulaire peut être de quelques dizaines, ou supérieur à une centaine par exemple, avec un pas angulaire pouvant aller de 2° à 10° environ. Dans le cas, fréquent dans les turbomachines, où le joint d'étanchéité est situé aux sommets d'un étage d'aubes fixes ou mobiles, sur un anneau unissant ces sommets, le pas angulaire des déflecteurs 13 peut être identique à celui des aubes.  The number of deflectors 13 in the angular direction may be a few tens, or greater than a hundred for example, with an angular pitch ranging from 2 ° to 10 °. In the case, common in turbomachines, where the seal is located at the vertices of a stationary or mobile blade stage, on a ring uniting these vertices, the angular pitch of the deflectors 13 may be identical to that of the blades .

Claims

REVENDICATIONS
1) Joint à labyrinthe d'une turbomachine, le joint comprenant une léchette (5) se dressant sur une embase (6) d'un rotor (1) de la turbomachine, la léchette étant circulaire en s'étendant le long d'une direction tangentielle (T), comprenant deux faces latérales (7, 8) se raccordant chacune à l'embase et, à une extrémité opposée à l'embase, à une face de sommet (9) de la léchette (5), où l'une au moins des faces latérales porte au moins un déflecteur (13) comprenant une face déflectrice (14) sécante à ladite face latérale et présentant une inclinaison par rapport à la direction tangentielle, caractérisé en ce que l'inclinaison de la face déflectrice par rapport à la direction tangentielle est croissante en s'approchant de la face de sommet (9), la face déflectrice étant ainsi concave. 1) Labyrinth seal of a turbomachine, the seal comprising a wiper (5) standing on a base (6) of a rotor (1) of the turbomachine, the wiper being circular extending along a tangential direction (T), comprising two lateral faces (7, 8) each connected to the base and, at an end opposite the base, to a crown face (9) of the wiper (5), where at least one of the lateral faces carries at least one deflector (13) comprising a deflecting face (14) secant to said lateral face and having an inclination with respect to the tangential direction, characterized in that the inclination of the deflecting face by relative to the tangential direction is increasing by approaching the summit face (9), the deflecting face thus being concave.
2) Joint à labyrinthe selon la revendication 1, caractérisé en ce que le déflecteur est répété sur la léchette à pas angulaire régulier dans la direction tangentielle (T).  2) labyrinth seal according to claim 1, characterized in that the deflector is repeated on the wiper regular angular pitch in the tangential direction (T).
3) Joint à labyrinthe selon la revendication 2, caractérisé en ce que le pas angulaire est compris entre 2° et 10°.  3) labyrinth seal according to claim 2, characterized in that the angular pitch is between 2 ° and 10 °.
4) Joint à labyrinthe selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la léchette est mobile dans la direction tangentielle et la face déflectrice (14) est dirigée dans un sens de mouvement (T+) de la léchette. 4) labyrinth seal according to any one of claims 1 to 3, characterized in that the wiper is movable in the tangential direction and the deflecting face (14) is directed in a direction of movement (T + ) of the wiper.
5) Joint à labyrinthe selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la face déflectrice (14) s'étend depuis l'embase (6) jusqu'à la face de sommet (9).  5) labyrinth seal according to any one of claims 1 to 4, characterized in that the deflecting face (14) extends from the base (6) to the apex face (9).
6) Joint à labyrinthe selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la face latérale portant le déflecteur est dirigée vers un amont d'un écoulement traversant le joint à labyrinthe dans une direction axiale (X) perpendiculaire à la direction tangentielle.  6) labyrinth seal according to any one of claims 1 to 5, characterized in that the side face carrying the deflector is directed upstream of a flow through the labyrinth seal in an axial direction (X) perpendicular to the tangential direction.
7) Joint à labyrinthe selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la léchette est inclinée, à partir de l'embase, vers un amont d'un écoulement (12) traversant le joint à labyrinthe dans une direction axiale perpendiculaire à la direction tangentielle. 7) labyrinth seal according to any one of claims 1 to 6, characterized in that the wiper is inclined, from the base, to an upstream of a flow (12) passing through the labyrinth seal in an axial direction perpendicular to the tangential direction.
EP18821725.1A 2017-11-15 2018-11-16 Labyrinth sealing comprising a knife edge seal having a deflector Active EP3695102B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18821725T PL3695102T3 (en) 2017-11-15 2018-11-16 Labyrinth sealing comprising a knife edge seal having a deflector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1760758A FR3073595B1 (en) 2017-11-15 2017-11-15 LABYRINTH JOINT COMPRISING A STICK WITH A DEFLECTOR
PCT/IB2018/001314 WO2019097286A1 (en) 2017-11-15 2018-11-16 Labyrinth seal comprising a lip provided with a deflector

Publications (2)

Publication Number Publication Date
EP3695102A1 true EP3695102A1 (en) 2020-08-19
EP3695102B1 EP3695102B1 (en) 2021-12-29

Family

ID=61003196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18821725.1A Active EP3695102B1 (en) 2017-11-15 2018-11-16 Labyrinth sealing comprising a knife edge seal having a deflector

Country Status (6)

Country Link
US (1) US11143049B2 (en)
EP (1) EP3695102B1 (en)
CN (1) CN111356821B (en)
FR (1) FR3073595B1 (en)
PL (1) PL3695102T3 (en)
WO (1) WO2019097286A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933445C2 (en) * 1999-07-16 2001-12-13 Mtu Aero Engines Gmbh Sealing ring for non-hermetic fluid seals
FR2825411B1 (en) * 2001-05-31 2003-09-19 Snecma Moteurs TURBINE DAWN WITH SEALING LECHETTE
US6890150B2 (en) * 2003-08-12 2005-05-10 General Electric Company Center-located cutter teeth on shrouded turbine blades
FR2893359A1 (en) * 2005-11-15 2007-05-18 Snecma Sa ANNULAR LETTER FOR A LARYRINTH OF SEALING, AND METHOD OF MANUFACTURING SAME
GB0808206D0 (en) * 2008-05-07 2008-06-11 Rolls Royce Plc A blade arrangement
US20120027573A1 (en) * 2010-08-02 2012-02-02 General Electric Company Seal teeth for seal assembly
FR2980234B1 (en) 2011-09-16 2016-08-19 Snecma DAWN FOR TURBOMACHINE WITH SEALING LECHETTES
EP2604797B1 (en) * 2011-12-13 2020-01-22 MTU Aero Engines GmbH Rotor blade with a rib assembly with an abrasive coating
JP6167158B2 (en) * 2015-12-09 2017-07-19 三菱日立パワーシステムズ株式会社 Seal structure and turbomachine

Also Published As

Publication number Publication date
PL3695102T3 (en) 2022-05-09
FR3073595A1 (en) 2019-05-17
EP3695102B1 (en) 2021-12-29
FR3073595B1 (en) 2020-02-07
CN111356821B (en) 2022-07-15
CN111356821A (en) 2020-06-30
WO2019097286A1 (en) 2019-05-23
US20210062668A1 (en) 2021-03-04
US11143049B2 (en) 2021-10-12

Similar Documents

Publication Publication Date Title
EP0947668B1 (en) Circular row of turbomachine guide vanes with inner ends assembled by a linking ring
EP2801702B1 (en) Inner shroud of turbomachine with abradable seal
EP1873401B1 (en) Turbomachine rotor and turbomachine comprising such a rotor
FR2968032A1 (en) SEALING ASSEMBLY FOR TURBOMACHINE
EP2705223B1 (en) Sealing apparatus of a guide conduit of a turbine of a turbomachine
FR2661945A1 (en) COVER STRIP FOR A FULL BLADE WHEEL.
EP2977549B1 (en) Axial turbomachine blading and corresponding turbomachine
EP0572312B1 (en) Sealing arrangement between stator blade rows and a rotating rotor drum
JP2002371802A (en) Shroud integrated type moving blade in gas turbine and split ring
FR2971000A1 (en) METHOD AND DEVICE FOR LABYRINTH JOINT TRIM RING
CA2826153A1 (en) Blade-platform assembly for subsonic flow
EP2867481B1 (en) Trunnion for a turbine engine comprising a ring for recovering a flow of lubricating oil with a plurality of lubricating oil discharge ports
FR2931904A1 (en) COMPRESSOR ROTOR BLADE CLEARANCE
CA2873942A1 (en) Fan blade for a turbojet of an aircraft having a cambered profile in the foot sections
FR2971540A1 (en) PLATFORM BLADE ASSEMBLY FOR SUPERSONIC FLOW
EP2564031B1 (en) Wear-resistant part for the support of a blade of a turbojet engine fan
FR3055353A1 (en) LABYRINTH SEAL ASSEMBLY FOR TURBOMACHINE COMPRISING ABRADABLE AND INCLINED LECHETTES
EP3695102B1 (en) Labyrinth sealing comprising a knife edge seal having a deflector
FR2959535A1 (en) TURBOMACHINE HOUSING
FR3084694A1 (en) ATTACHING A VALVE TO A CASING OF A TURBOMACHINE
EP2458157B1 (en) Abradable interior stator ferrule
EP3382242B1 (en) Brush seal for a turbine engine rotor
EP0089600B2 (en) Guide vane configuration for a steam turbine with divergent channel
FR3029982B1 (en) SEALED SEAL FOR DOUBLE, AXIAL AND RADIAL SEALING
EP3420198A1 (en) Rectifier for aircraft turbomachine compressor, comprising air extraction openings having a stretched form in the peripheral direction

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20200514

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20210720

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1458823

Country of ref document: AT

Kind code of ref document: T

Effective date: 20220115

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602018028932

Country of ref document: DE

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220329

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20211229

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1458823

Country of ref document: AT

Kind code of ref document: T

Effective date: 20211229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220329

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220330

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220429

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220429

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602018028932

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20220930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20221130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221130

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221116

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221116

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221130

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231019

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20231019

Year of fee payment: 6

Ref country code: FR

Payment date: 20231019

Year of fee payment: 6

Ref country code: DE

Payment date: 20231019

Year of fee payment: 6

Ref country code: CZ

Payment date: 20231025

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20231025

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211229