FR3096401A1 - SECTOR OF A DISTRIBUTOR AND DISTRIBUTOR OF A TURBINE OF AN AIRCRAFT TURBOMACHINE - Google Patents

Abstract

Sector of a distributor and distributor of a turbine of an aircraft turbomachine The present invention relates to a distributor (1) of a turbine (2) of an aircraft turbomachine comprising a sealing part (6 ) in one piece provided with a lamellar part (61) arranged to be interposed in a space separating a portion (31, 41) of an outer or inner platform of a distributor (3, 4) and an element of the turbomachine adjacent to the distributor (1), in order to ensure fluid sealing on either side of this space. This sealing piece (6) also comprises hooking parts (62) provided with a free curved end (63) surrounding a protuberance (32) of the portion (31, 41), and held in position by means ( 7) fixing comprising at least one pin and / or rivet (71). Figure for the abstract: Figure 2

Description

Description Title of the invention: SECTOR OF A DISTRIBUTOR AND DISTRIBUTOR OF A TURBINE OF AN AIRCRAFT TURBOMACHINE Field of the invention 100011 The present invention relates to a sector of a distributor and a distributor of a turbine of an aircraft turbine engine.

Technical background

[0002] A turbine of an aircraft turbomachine makes it possible to recover at least partially a gas combustion energy generated in a combustion chamber.

Such a turbine generally comprises different stages along the main axis of the turbomachine.

A stage consists of a fixed vane called a distributor or stator, followed by a moving vane called a rotor.

One role of the distributor is to direct a flow of gas leaving the combustion chamber onto the blades of the rotor, so as to optimize the flow of this flow of gas in the turbine.

It is necessary to cool the vanes of the distributor because they are exposed to high temperature gases.

This is done by means of a cooling system conveying less hot air generally coming from a compressor of the turbomachine on the blades of the distributor.

[0004] Insufficient sealing between an aerodynamic stream in which the gases from the combustion chamber pass, on the one hand, and a cooler air supply chamber, on the other hand, is likely to cause heating significant impact on the latter, thus impacting the service life of the distributor and other adjoining parts.

[0005] It is known from patent FR 2 829 796 BI to provide the turbomachine with a sealing system comprising lamella seals interposed in the spaces between the distributor and the combustion chamber, and disjoint biasing means of the lamellae and confectioners to press them into a sealing position.

It is also known to use slightly different systems using sealing strips which are pressed into a sealing position by hooks.

The slat/hook assembly is secured by two pins or rivets on an external annular platform of the distributor.

In these known systems, a joint cover is also used to seal between two slats.

Such a joint cover is also described in patent FR 2 829 796 B I .

[0006] Wear and breakage of the pin/rivet holding the slat/hook assembly on an external platform of the distributor was observed.

Following such breaks, losses 2 of slats and/or joint covers were also noted.

The lifetime of known sealing systems can therefore be improved.

Summary of the invention

[0007] An object of the present invention is to provide a sector of a distributor and a distributor having a sealing system having a longer service life.

[0008] To this end, the present invention proposes a sector of a distributor of a turbine of an aircraft turbomachine, preferably a high-pressure turbine, comprising: - an outer platform; - an interior platform; - a guide vane (fixed) extending radially between these platforms; the sector comprising a sealing system to ensure fluidic sealing between fluids of different temperatures and comprising: - a lamellar sealing part extending circumferentially to ensure fluidic sealing; - two picking parts, to press the lamellar sealing part into a sealing position; - A joint cover part dc to cover a joint between the lamellar part and a part of another sector of the distributor adjacent to the sector; characterized in that the lamellar part, the two hooking parts and the joint cover part form part of one and the same sealing piece in one piece.

The distributor sector according to the present invention incorporates a sealing system having a longer life dc without loss in its sealing quality.

[0010] Indeed, a defect of the sealing systems of the prior art is that the parts constituting them are liable to undergo wear and/or breakage following certain friction during operation of the turbomachine.

In particular, this phenomenon of wear and/or breakage is accelerated when there exists or is created a fault in the position of a slat relative to its sealing position.

In the sealing system according to the present invention, the slat is not held in the sealing position by means of separate stresses.

It is itself integrated within a single sealing part, in one piece, as a lamellar part, and provided with two hooking parts to press it into a sealing position.

The hooking parts also serve as an intermediary to mechanically fasten the lamellar sealing part to one of the platforms, preferably by the fixing means, and so as to stabilize the entire sealing part and to hold the lamellar part in such a way continues in its sealing position.

Separate parts of a sealing system liable to undergo wear and/or breakage following certain frictions are therefore no longer present in the sector of the distributor (and/or the distributor) of the invention as such. since they are integrated in one and the same sealing part.

The hooking parts also make it possible to generate a spring effect similar to those of the old biasing means, so as to continuously push the lamellar part into its sealing position.

[0012] The joint cover part completes, for its part, a sealing function of the sealing part, particularly at the level of the joint with a neighboring part of an adjacent sector of the distributor, preferably a joint between two adjacent lamellar parts of an overall sealing system of the distributor comprising said sealing system of the sector, the first being the lamellar part of the sealing piece according to the invention and the second being preferably mechanically coupled to a area adjacent to the distributor.

This second lamellar part therefore preferably corresponding to the adjacent part does not necessarily constitute an element of another integral sealing part associated with this adjacent sector, but can be any type of lamella. sealing known according to the prior art.

However, and preferably, this second lamellar part is typically an element of another one-piece sealing part as described according to the invention and mechanically coupled to a sector of the distributor also according to the invention and adjacent to the sector according to the invention considered.

[0013] The present invention advantageously proposes the integration of this part of the joint cover to the sealing piece in one piece.

Thus, it is avoided to have to insert and mechanically fix a disjoint joint cover between the slats and another structural part of the distributor, which is a source of difficulties and risks of wear and/or loss of the joint cover or damage. a lamella when using the dispenser.

[0014] In particular, and advantageously, the sealing part incorporates both a lamellar part, a joint-covering part and picking parts in one and the same particularly robust one-piece piece, both simple to manufacture and to install in the distributor.

[0015] The technical solution proposed by the invention therefore makes it possible to preserve the primary sealing function of the sealing system, while making it more robust, without requiring expensive and/or complex technical modifications to the distributor.

[0016] Advantageously, the sealing piece according to the invention is simple, quick and inexpensive to manufacture because it is in one piece.

In addition, the management of orders, manufacturing, stock, and/or repairs of a single sealing part is clearly easier to implement than that of a lamella, a joint cover and other separate parts.

[0017] Advantageously, the sealing piece according to the invention is lighter, thus allowing an overall weight reduction of a few grams for the sector of the distributor according to the invention, which is important in the context of aerodynamic application.

[0018] Advantageously, the sealing piece according to the invention is arranged upstream and/or downstream on the outer platform, as well as upstream on the inner platform.

This situation is illustrated in particular in FIG. 1, introduced below.

In addition, the distributor according to the present invention is suitable for a wide range of aircraft turbine engines.

[0019] The use, in this document, of the verb "to understand", of its variants, as well as its conjugations, cannot in any way exclude the presence of elements other than those mentioned.

The use, in this document, of the indefinite article "un", "une", or of the definite article "le", "la" or "", to introduce an element does not exclude the presence of a plurality of these elements.

[0020] The interior and exterior platforms are preferably and respectively portions of interior and exterior distributor platforms (and, in this case, of the distributor in question).

The latter are preferentially annular.

A circumference of these distributor platforms defines a so-called “circumferential” direction.

This definition naturally extends to the portions of distributor platforms, and in particular to the indoor and outdoor platforms of the sector.

The term “circumferential” is commented on in the detailed description of this document with regard to the figures.

[0021]As its name indicates, a "lamella" or "lamellar part" preferably refers to a volume spread over a surface of a thin thickness perpendicular to this surface, the surface extending mainly from circumferentially, preferably being substantially rectangular in shape.

In the context of this document, by "extremal segment" of a lamellar part, it is preferably understood a portion of this volume consisting of a circumferential end of the surface extended both over a width radially and over said thickness. axially.

[0022] Preferably, the lamellar sealing part is interposed radially or axially in a part of the space separating the at least one of the platforms and a structural element of the turbomachine adjacent to the sector and/or to the distributor (for example, the combustion chamber), and this in such a way as to ensure a fluid seal on either side of this part of the space, where fluids of different temperatures circulate.

[0023] The lamellar part preferably comprises a lamella joint.

[0024]Preferentially, the joint cover part extends circumferentially an end segment of the lamellar part.

According to a particular embodiment, the lamellar part extends circumferentially beyond one of the platforms.

More particularly, the extension of the lamellar part beyond one of the platforms is observed on the extremal segment extended into the joint cover part.

It is thus advantageously easy to make a joint with an adjacent element of an overall sealing system of the distributor, preferably another lamellar part or lamella adjacent to said lamellar part, by means of the joint cover part because both that -here that the extremal segment considered will protrude circumferentially over the adjacent sector comprising the adjacent element, thus making it possible to cover the joint by the part of joint cover at the level of the adjacent sector.

According to a very preferred embodiment of the invention, the sealing system comprises fastening means for mechanically coupling the lamellar sealing part to one of the platforms via the hooking parts.

In this case, the sealing part is preferably fixed to this platform by means of these fixing means.

[0026] Preferably, according to this very preferred embodiment of the invention, each of the hooking parts comprises a free curved end, at least partially surrounding a protrusion (or leg, or shoulder) of one of the platforms, and fixed mechanically to the latter by a mechanical connection made by the fastening means.

[0027] This preferred embodiment of the invention technically describes a feature of the hooking parts making it possible to implement in a practical way the mechanical attachment of the lamellar part to one of the parts.

This very preferred embodiment is very advantageous because it allows implementation of this attachment at a distance from the lamellar part when, according to an independently preferred embodiment, the hooking parts extend axially from this lamellar part.

In this way, the risks of possible friction between parts of the fastening means and the lamellar part or the part of the joint cover vibrating during operation of the distributor are all the more removed.

[0028]Even more preferably, the fastening means comprise a pin or a rivet passing through both an orifice made in the protrusion and an orifice made in the free termination, so as to ensure said mechanical connection.

[0029] More preferably still, the free termination is: - of a circumferential section in the shape of a "U", and - pierced with two aligned orifices through which the pin or the rivet passes.

[0030] Advantageously, the free termination marries a part of the protrusion, so as to form a sandwich which is then pierced by the pin or the rivet.

The free termination is thus fixed both easily and robustly to the at least one platetbrme.

Given that at least two such mechanical connections are provided for a sealing part 6 via the two hooking parts, preferably from the two end segments of the lamellar part, the entire part of seal is effectively and securely held in position.

In addition, the part of the joint cover is also held in position without the need to fix it by additional studs or rivets.

Preferably, the two hooking parts consist of two hooking parts extending dc axially from two opposite end segments of the lamella.

[0032] Advantageously, the sealing part is thus held in position thanks to a minimum of mechanical connections, and by a minimum of fixing means such as pins or rivets, which limits the risk of damage to these parts as well than the cost of manufacture and maintenance of the distributor.

According to a preferred embodiment of the invention, the one-piece sealing part is obtained by stamping.

[0034] As announced in the subject of the present invention, the latter also proposes a distributor for a turbine of an aircraft turbomachine comprising: an external distributor platform; - an interior distributor platform; - a plurality of guide vanes (fixed) which extend radially from the inner distributor platform to the outer distributor platform; - an overall sealing system to ensure fluid sealing between fluids of different temperatures; the dispenser further comprising a plurality of sectors each of which comprises: - an outer platform consisting of a portion of the outer dispenser platform; - an interior platform consisting of a portion of the interior dispenser platform; - One of the vanes extending radially between these platforms;

[0035] characterized in that at least one of the sectors is according to the invention, the sealing system of this sector forming an integral part of the overall sealing system of the distributor.

[0036] In other words, the at least one of the sectors comprises a sealing part in one piece of the sealing system, the sealing part comprising: - a lamellar sealing part extending from circumferentially to ensure the fluid seal; - two picking parts, to press the lamellar sealing part into a sealing position; - a joint covering part to cover a joint, preferably between two adjacent lamellar parts of the overall sealing system including said lamellar part.

[0037] For the same reasons as set out above, the distributor according to the present invention incorporates an overall sealing system of the distributor having a longer service life without loss of its sealing quality.

Preferably, each sector of the distributor comprises at least one sealing part as described according to the present invention, so as to provide sealing on either side of a space where fluids circulate at temperatures distinct, between the distributor and a structural element of the turbomachine adjacent to the distributor, and circumferentially, upstream and/or downstream at the level of the outer distributor platform, and/or upstream at the level of the inner distributor platform .

In this case, the various lamellar parts are preferably adjacent circumferentially, placed end to end, their joints being covered by parts of joint covers integrated into the sealing parts themselves.

According to a preferred embodiment of the invention, the distributor comprises between 13 and 19 sectors according to the invention and between 13 and 57 sealing parts in one piece.

[0040] All of the preferred embodiments as well as all of the advantages linked to the sector and/or to a sealing part according to the invention transpose mutatis mutandis to the distributor according to the invention, and more particularly to the distributor for which at least one of the platforms of each of the sectors is mechanically coupled to a sealing part as described above in the context of the present invention.

The present invention also proposes a turbine, preferably a high pressure turbine, of an aircraft turbomachine comprising a distributor according to the invention.

The present invention also proposes an aircraft turbine engine comprising a turbine, preferably a high pressure turbine, according to the invention.

All of the preferred embodiments as well as all of the advantages of the distributor according to the present invention transpose mutatis mutandis to the turbine and turbomachine according to the invention.

Brief description of figures

Other characteristics and advantages of the present invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended figures, among which:

[0043] [fig.1] FIG. 1 illustrates a schematic view of a section of a portion of a turbomachine comprising a distributor according to a preferred embodiment of the invention;

[0044] [fig.2] Figure 2 illustrates a three-dimensional schematic view of a sector of a distributor according to a preferred embodiment dc of the invention;

[0045] [fig.3] Figure 3 illustrates a schematic three-dimensional view of a sealing piece suitable for a dispenser according to a preferred embodiment of the invention;

[0046] [fig.4] Figure 4 illustrates a three-dimensional schematic view of a joint between two sealing parts of two adjacent sectors of a distributor according to a preferred embodiment of the invention.

The drawings of the figures are not to scale.

Generally, similar elements are denoted by identical references in the figures.

In the context of this document, identical or similar elements may bear the same references.

Furthermore, the presence of reference numbers or letters in the drawings cannot be considered as limiting, including when these numbers or letters are indicated in the claims.

Detailed description of the invention

The present invention is described with specific embodiments and references to figures, but the invention is not limited thereto.

The drawings or figures described are only schematic and are not limiting.

In the context of this document, reference is made to several directions: “axial” preferably consisting of a direction parallel to an engine axis around which the turbine extends, “circumferential” preferably consisting of an elliptical direction, preferably circular, along a circumference of the turbine, around dc the motor axis, and "radial" preferably consisting of a direction perpendicular to the motor faxe.

The terms “radial” and “circumferential” preferably refer to a polar coordinate system known to a person skilled in the art considered in each plane perpendicular to the motor axis.

Figure 2 includes a reference illustrating these axial A, radial R, and circumferential C directions.

The turbomachine, part of a section of which is illustrated in FIG. 1, comprises a distributor 1 according to the invention and a combustion chamber 91 which is adjacent to it.

The distributor 1 is part of a high pressure turbine 2 consisting of at least one stage.

The distributor comprises both an outer annular distributor platform 3, an inner annular distributor platform 4, and a plurality of guide vanes 5 which extend radially from the inner distributor platform 4 to the outer distributor platform 3.

The turbine 2 is generally supported by a structure comprising, on a radially outer side, an outer casing 81 of the combustion chamber 91, an outer turbine ring 82 and a turbine casing 83 being connected together by bolts, and , on a radially inner side, an inner casing 84 of the turbine connected to an inner casing 85 of the combustion chamber 91.

The combustion chamber 91 is essentially annular and delimited by outer 86 and inner 87 jackets.

In operation, cooling air circulates around the combustion chamber 91, in the outer annular enclosure 92 delimited by the outer casing 81 and the outer jacket 86 and in the inner annular enclosure 93 delimited by the inner casing 85 and the inner shirt 87.

This cooling air flows, downstream, through orifices 94A made in a wall 88A which connects the downstream ends of the outer casing 81 and of the outer jacket 86, and cc in order to cool guide vanes of the distributor 1.

This air also flows through orifices 94B made in a wall 88B connecting the downstream ends of the inner casing 85 and the inner sleeve 87, in order to cool the inner distributor platform 4.

The guide vanes 5 are made in the form of one-piece sectors each comprising at least one guide vane extending radially from a portion of the inner distributor platform 4 to a portion of the outer distributor platform 3.

As detailed in the prior art section, it is crucial to avoid any leakage of fluid between the portions of the nozzle platforms of the sectors and the adjacent structural elements of the turbomachine.

[0052] To do this, the distributor 1 according to the invention comprises an overall sealing system comprising lamellar parts 61 comprising a lamella seal which are interposed in a first space 95 located between an upstream end of the outer platform portions of distributor 3 and the wall 88A, in a second space 96 located between an upstream end of the distributor interior platform portions 4 and the wall 88B, and also in a third space 97 between a downstream end of the distributor exterior platform portions 3 and the outer ring 82.

The lamellar parts 61 are curved, contiguous, each being arranged circumferentially and mechanically coupled to a sector of the distributor 1, resting on a protuberance (or lug, or shoulder) 32 formed at the upstream end of the outer platform portions of distributor 3, or on a protrusion (or lug, or shoulder) 33 formed at the downstream end of the portions of the distributor's outer platform 3, or else on a protrusion (or lug, or shoulder) 42 formed at the upstream end of the inner distributor platform portions 4.

These lamellar parts 61 make it possible to ensure a fluid seal on either side of these spaces 95, 96, 97 and to prevent a leak of fluid as mentioned above.

Two adjacent lamellar parts 61 are contiguous so as to form one and the same continuous joint and to provide sealing in the aforementioned spaces between two adjacent sectors of the dispenser.

To do this, it is necessary for the joint between the two lamellar parts 61 to be covered with a joint cover.

In the case of the present invention, this joint cover is integrated into the lamellar part 61 in a joint cover part 64 extending circumferentially one of the two adjacent lamellar parts 61 as it is both illustrated and commented on below. after with regard to Figure 4.

[0054] The heart of the invention lies in the fact that each of the lamellar parts 61 is an integral part of a single one-piece sealing part provided with two hooking parts 62 extending axially from of the lamellar parts 61, and having a free end 63 curved with a circumferentially elongated bell-shaped profile, of "U" cross-section, to surround the protrusion (or leg, or shoulder) 32, 33 or 42 of the distributor platform portion to which the lamellar part 61 is mechanically coupled.

The entire sealing part, and therefore the lamellar part 61 and the joint cover part 64, is thus held in a stable position by mechanical connections by means of pins 71 passing through orifices of the protrusion 32, 33 or 42 and the termination 63, so as to mechanically secure the latter in position on the protrusion 32, 33 or 42.

Each lamellar part 61 is then both pressed into a sealing position by the hooking parts 62 and secured to a portion of the distributor platform by means of these hooking parts 62, themselves integrated into this advantageous part sealing, and cc without it being necessary to attach to the sealing system (global or of a sector) an additional stressing system comprising other disjointed mechanical parts that risk being subjected to friction with the lamellar part 61, wear, and/or breakage.

Figure 2 illustrates more precisely a sector 11 of a distributor 1 according to the present invention.

This sector 11 comprises guide vanes 5 extending radially from the portion 41 of the inner distributor platform 4 which corresponds to the sector 11, to the portion 31 of the outer distributor platform 3 which corresponds to the sector 11.

In the context of this document, these "portions" 31, 41 are called in an equivalent and respective manner the outer and inner platforms of the sector 11.

In this figure, the overall sealing system, comprising the sealing part 6 previously introduced, is represented, at the level of the sector 11, upstream, on the portion 31 of the external distributor platform 3 which corresponds to the sector 11.

As aforesaid with regard to Figure 1, this representation is of course not limiting of a preferred position of the sealing system at the level of the sector 11 or of the sealing part 6.

Figure 3 illustrates, for its part, the sealing part 6 alone.

As explained with regard to Figure 1, the sealing part 6 is in one piece and comprises: - a lamellar part 61 sealing; 11

- two picking parts 62 extending axially from two opposite end segments 61A and 61B of the lamellar part 61;

[0059] - a free end 63 of each hooking part 62 being curved and configured to at least partially surround a protrusion 32 of the portions 31;

[0060] these hooking parts 62 being designed to act as spring hooks for the mechanical attachment of the lamellar part 61;

- a joint cover part 64 which extends continuously and circumferentially the extremal segment 61B of the lamellar part 61, the latter extending circumferentially beyond the portion 31.

[0062] Preferably, all the sealing parts 6 of the overall sealing system of the distributor 1 are similarly made and oriented.

As shown in Figure 2, fixing means 7 comprising pins 71 and forming two mechanical connections are arranged to mechanically fix each free termination 63 on the protrusion 32.

Each of the two mechanical connections is made simply and inexpensively by a pin 71 (or a rivet) passing through an orifice made in the protrusion 32 as well as two aligned orifices 65 made in the free termination 63.

[0064] Figure 4 more specifically illustrates a joint between two sealing parts of two adjacent sectors 11A and 11B of a distributor 1 according to a preferred embodiment of the invention.

The joint cover part 64 of a first of these sealing parts 6 extends circumferentially substantially further downstream than the lamellar part 61 of this first sealing part, so that it overcomes axially the part lamellar 61 of a second of these sealing parts 6, thus covering a joint between the two lamellar parts 61, and ensuring a better seal at this joint.

[0065] In summary, the invention relates to a distributor 1 of a turbine 2 of an aircraft turbomachine comprising a sealing piece 6 in one piece provided with a lamellar part 61 arranged to be interposed in a space separating a portion 31, 41 of an outer or inner platform of the distributor 3,4, and an element of the turbomachine adjacent to the distributor 1, in order to ensure fluid sealing on either side of this space.

The sealing part 6 also comprises hooking parts 62 provided with a free curved end 63 surrounding a protrusion 32 of the portion 31, 41, and being held in position by fixing means 7 comprising at least one pin and/or or rivet 71.

[0066] The present invention has been described in relation to specific embodiments, which have a purely illustrative value and should not be considered as limiting.

Generally, it will be apparent to a person skilled in the art that the present invention is not limited to the examples illustrated and/or described above.

13 [Claim 1] [Claim 2] [Claim 3] [Claim 4] [Claim 5]

Claims (1)

CLAIMS Sector (11) of a distributor (1) of a turbine (2) of an aircraft turbomachine comprising: - an outer platform (31); - an interior platform (41); - a guide vane (5) extending radially between said platforms (31, 41); the sector (11) further comprising a sealing system to ensure fluidic sealing between fluids of different temperatures, and comprising: - a lamellar sealing part (61) extending circumferentially to ensure said fluidic sealing; - two hooking parts (62), for pressing said lamellar sealing part (61) into a sealing position; - a joint cover part (64) to cover a joint between said lamellar part (61) and a part of another sector of said distributor adjacent to said sector (11); characterized in that said lamellar part (61), said two hooking parts (62) and said joint cover part (64) form part of one and the same sealing part (6) in one piece. Sector (11) according to the preceding claim, characterized in that said sealing system comprises fastening means (7) for mechanically coupling said lamellar sealing part (61) to one of said platforms (31, 41) by the intermediate said picking portions (62). Sector (11) according to the preceding claim, characterized in that said sealing piece (6) is fixed to said one of said platforms (31, 41) by means of said fixing means (7). Sector (11) according to the preceding claim, characterized in that each of the said hooking parts (62) comprises a curved free termination (63), at least partially surrounding a protuberance (32) of the said one of the said platforms (31, 41), and fixed to the latter by said fixing means (7). Sector (11) according to the preceding claim, characterized in that the said fixing means (7) comprise a pin or a rivet. (71) passing through both an orifice made in said protuberance (32) and an orifice (65) made in said free termination (63). [Claim 6] Sector (11) according to the preceding claim, characterized in that the said free termination (63) is: - of a circumferential section in the shape of a "U", and - pierced with two orifices (65) aligned and crossed by said pin or said rivet (71). [Claim 7] Sector (11) according to any one of the preceding claims, characterized in that the said two hooking parts (62) extend axially from the said lamellar part (61). [Claim 8] Sector (11) according to the preceding claim, characterized in that said two hooking parts (62) extend axially from two opposite end segments (61A, 61B) of said lamellar part (61) . [Claim 9] Sector (11) according to any one of the preceding claims, characterized in that the said joint cover part (64) circumferentially extends an end segment (61B) of the said lamellar part (61) of so as to cover a joint between said lamellar part (61) and another adjacent similar lamellar part. [Claim 10] Sector (11) according to any one of the preceding claims, characterized in that the said lamellar part (61) extends circumferentially beyond the said one of the said platforms (31, 41). [Claim 11] Sector (11) according to any one of the preceding claims, characterized in that the said sealing piece (6) is obtained by stamping. [Claim 12] Distributor (1) of a turbine (2) of an aircraft turbomachine comprising: - an external distributor platform (3); - an interior distributor platform (4); - a plurality of direcnice vanes (5) extending radially from said inner distributor platform (4) to said outer distributor platform (3); - an overall sealing system to ensure fluid sealing between fluids of different temperatures; the dispenser (1) comprising a plurality of sectors (11) each of which comprises: - an outer platform (31) consisting of a portion of said outer dispenser platform (3); - an outer platform (41) consisting of a portion of said [Claim 13] inner distributor platform (4); [Claim 14] - one of said blades (5) extending radialemcnt between said platforms (31, 41); [Claim 15] characterized in that at least one of said sectors (11) is according to any one of the preceding claims, the sealing system of this sector (11) forming an integral part of the said overall sealing system of the distributor (1 ). Distributor (1) according to the preceding claim comprising between 13 and 19 sectors (11) according to any one of Claims 1 to 11 and between 13 and 57 sealing parts (6) in one piece. High-pressure turbine of an aircraft turbine engine comprising a distributor (1) according to any one of the two preceding claims. Aircraft turbomachine comprising a high-pressure turbine according to the preceding claim.