Sealing assemblies for turbine engines

Abstract

A sealing assembly (1) for a turbine engine, comprising a first element (2) and a second element (3), the first element and the second element (2, 3) being concentric and rotating relative to each other around a rotation axis (X), the sealing assembly (1) comprising at least one first scraper (4a) and a wearable member (5), the first scraper (4a) being annular and carried by the first element (2), the first scraper (4a) extending radially toward the wearable member (5) and continuously around the rotation axis (X), the wearable member (5) being annular and carried by the second element (3), the wearable member (5) being tangentially connected to the wearable member (5). The first scraper (4a) extends relatively, and the first scraper (4a) includes main angle segments (11), each main angle segment extends tangentially along the main angle sector (11'), and each main angle segment (11) has a constant first profile in cross section, and is characterized in that the first scraper (4a) includes secondary angle segments (13), each secondary angle segment extends tangentially along the secondary angle sector (13'), and each secondary angle segment (13) has a second profile different from the first profile in cross section, the number of the secondary angle segments (13) is equal to the number of the main angle segments (11), and the secondary angle segments (13) are inserted between the main angle segments (11).

Description

Technical Field

[0001] The present invention relates to a sealing assembly for a turbine engine. Background Art

[0002] Turbine engines include a plurality of dynamic seal assemblies, ie, seal assemblies for providing a seal between two components, at least one of which is movable.

[0003] The dynamic seal assembly will be the focus of the remainder of this application.

[0004] Such a sealing assembly comprises, for example, a first element that is rotatable (hereinafter referred to as “rotor element”) and a second element that is fixed in the reference frame of the turbine engine (hereinafter referred to as “stator element”).

[0005] More specifically, the rotor element includes at least one scraper, and the stator element includes an abradable member extending around the scraper. The scraper is configured to cooperate with the abradable member.

[0006] Such a sealing assembly enables leakage to be reduced to a minimum despite the relative displacement between the wiper and the abradable part.

[0007] The scraper is mounted with radial clearance relative to the abradable member. When the turbine engine is running, the scraper and the abradable member move relative to each other (radially and axially) under the influence of various external stresses (thermal stress, aerodynamic stress, mechanical stress, etc.).

[0008] Depending on the operating conditions of the turbine engine (take-off, cruise, etc.), the radial clearance is thus reduced or even eliminated during the contact between the wiper and the abradable component. The main contact occurs when the turbine engine is running.

[0009] Upon contact, the scrapers penetrate and cut the abradable part, thereby generating material chips.

[0010] For example, from document FR-B1-3071540 in the name of the applicant, it is known to implement a scraper with a constant 360° cross-sectional profile, the top of which comprises a groove opening radially outwards. Such a scraper improves the tightness of the sealing assembly by increasing the turbulence generated.

[0011] However, such scrapers also have their disadvantages.

[0012] This is because when the wiper comes into contact with the wearable member, the temperature of the seal assembly components rises rapidly and significantly. This high temperature rise is caused in particular by the large amount of contact surface (or friction surface), the accumulation of debris in the grooves and the lack of cutting elements.

[0013] The higher the temperature reached, the hotter the environment to which the sealed components are exposed.

[0014] High temperature operation severely limits the service life of sealing components, requiring regular replacement.

[0015] Furthermore, the significant heating of the seal assembly imposes a maximum temperature that must not be exceeded in the various environments in which the seal assembly is installed in order to avoid compromising performance and risking premature wear.

[0016] The object of the present invention is therefore to propose a sealing assembly that limits the heating caused by the contact between the scraper and the abradable member while maximizing its sealing properties.

[0017] The prior art also includes documents FR-A1-3072121, EP-A1-1785651, FR-A1-3078740, FR-A1-2974842, CN-B-108266236, SU-A1-792014 and EP-A1-3144568. Summary of the Invention

[0018] Therefore, the present invention proposes a sealing assembly for a turbine engine, comprising a first element and a second element, the first element and the second element being concentric and rotating relative to each other about an axis of rotation X, the sealing assembly comprising at least one first scraper and an abradable member, the first scraper being annular in shape and carried by the first element, the first scraper extending radially toward the abradable member and continuously about the axis of rotation X, the abradable member being annular in shape and carried by the second element, the abradable member extending tangentially opposite the first scraper, the first scraper comprising principal angle segments, each extending tangentially along a principal angle sector, the principal angle segments each having a constant first profile in cross section, characterised in that the first scraper comprises secondary angle segments, each extending tangentially along a secondary angle sector, the secondary angle segments each having a second profile in cross section different from the first profile, the number of secondary angle segments being equal to the number of principal angle segments, the secondary angle segments being interposed between the principal angle segments.

[0019] The scraper according to the invention therefore comprises alternating (or alternating consecutive) main angular segments and minor angular segments, in other words, two consecutive main angular segments are separated from each other by a minor angular segment.

[0020] The alternation of major and minor angular sectors creates a discontinuity around the axis of rotation X which facilitates the removal of the abradable member and the evacuation of the debris of the abradable material, thereby limiting the heating caused by the contact between the scraper and the abradable member.

[0021] Such a discontinuity also makes it possible to avoid prolonged contact between the scraper and the abradable member, thus also limiting the heating caused by contact.

[0022] Compared to the prior art, this seal assembly has an increased service life and can be installed in higher temperature environments, which is particularly beneficial to the performance of turbine engines.

[0023] The structure of the wearable part of such a sealing assembly can be varied. In fact, the reduction in temperature makes it possible to consider replacing the honeycomb structure with a dense layer structure. As a reminder, the honeycomb structure withstands higher temperatures than the dense layer structure, but causes a greater pressure drop.

[0024] Such a sealing assembly also makes it possible to limit the generation of heat and therefore the thermal expansion of the surrounding components, which increases the service life of the surrounding components.

[0025] The sealing assembly according to the present invention may include one or more of the following features and / or steps, either alone or in combination:

[0026] - a second profile of at least one of the secondary angular segments varies from one angular position to another;

[0027] - each sub-segment comprises at least one sharp edge;

[0028] - each sub-segment comprises a first groove opening radially outwards;

[0029] - a first groove opens into at least one side surface of the first scraper;

[0030] - each sub-segment comprises a second groove symmetrical to the first groove relative to a median plane M of the first scraper, the median plane M being perpendicular to the axis of rotation X of the sealing assembly; the second groove being different from the first groove;

[0031] - the first groove has the shape of a circle segment;

[0032] - Each of the first groove and the second groove is blind-closed (or has no opening);

[0033] - the first groove and the second groove are not connected to each other;

[0034] - each sub-segment comprises a central peak centered on a median plane M, laterally delimited by each of the first and second grooves, the median plane M being perpendicular to the axis of rotation X of the sealing assembly;

[0035] - each of the first groove and the second groove is defined by a sharp edge having a closed curved profile;

[0036] - Each of the first groove and the second groove comprises a bottom with a connecting rounded corner;

[0037] - the first groove forms a flat portion on the outer surface of the first scraper;

[0038] - the flat portion is tangentially delimited by two sharp edges, each in the form of a sharp ridge;

[0039] - Each of the two sharp edges is substantially parallel to the axis of rotation X of the sealing assembly;

[0040] - Each of the first groove and the second groove is partially or partially open (or open) to form a channel or communication portion between the first groove and the second groove;

[0041] - each sub-segment comprises a tapered segment (or peak) and a pointed segment, the tapered segment and the pointed segment being separated from each other by a channel and adjoined by a first groove and a second groove;

[0042] - the tapered section comprises a biconcave stretch and a biconvex stretch;

[0043] a biconcave stretch adjacent to the main section, a biconvex stretch arranged tangentially between the biconcave stretch and the channel;

[0044] - the channel is tangentially defined by two radial sharp ridges, namely a first sharp ridge of the pointed section and a second sharp ridge of the biconvex stretch of the conical section;

[0045] - each of the first groove and the second groove is defined by a sharp edge having an open curved profile;

[0046] - each sub-segment comprises a lamella mounted on the outer surface of the body of the first scraper;

[0047] - the sheet comprises a base supported on the outer surface of the body and two opposite wings each extending from the base, each of the wings being supported on a side surface of the body;

[0048] - the base is tangentially delimited by two sharp edges, each in the form of a sharp ridge;

[0049] - Each of the two sharp edges is substantially parallel to the axis of rotation X of the sealing assembly;

[0050] The seal assembly comprises a second, separate scraper axially spaced from the first scraper, the abradable member extending tangentially opposite the second scraper.

[0051] The invention also relates to a turbine engine comprising at least one sealing assembly as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The invention will be better understood and other details, features and advantages of the invention will become clearer from the following description given by way of non-limiting example with reference to the accompanying drawings, in which:

[0053] [ Figure 1 ] Figure 1 is a schematic axial cross-sectional view of a turbine engine;

[0054] [ Figure 2 ] Figure 2 is a perspective view of a sealing assembly according to a first embodiment of the present invention;

[0055] [ Figure 3 ] Figure 3 yes Figure 2 a front view of the assembly shown;

[0056] [ Figure 4 ] Figure 4 is based on Figure 3 Detailed view of reference frame C;

[0057] [ Figure 5 ] Figure 5 It is along Figure 4 A cross-sectional view of section AA;

[0058] [ Figure 6 ] Figure 6 It is along Figure 3 A cross-sectional view of section BB;

[0059] [ Figure 7 ] Figure 7 is a perspective view of a sealing assembly according to a second embodiment of the present invention;

[0060] [ Figure 8 ] Figure 8 yes Figure 7 a front view of the assembly shown;

[0061] [ Figure 9 ] Figure 9 is based on Figure 8 Detailed view of reference frame C;

[0062] [ Figure 10 ] Figure 10 It is along Figure 9 A cross-sectional view of section AA;

[0063] [ Figure 11 ] Figure 11 It is along Figure 8 A cross-sectional view of section BB;

[0064] [ Figure 12 ] Figure 12 is a perspective view of a scraper of a sealing assembly according to a third embodiment of the present invention;

[0065] [ Figure 13 ] Figure 13 yes Figure 12 Detailed perspective view of the scraper in;

[0066] [ Figure 14 ] Figure 14 yes Figure 12 Detailed top view of the scraper in FIG;

[0067] [ Figure 15 ] Figure 15 yes Figure 12 Detailed side view of the scraper in;

[0068] [ Figure 16 ] Figure 16 yes Figure 12 Detailed front view of the scraper in;

[0069] [ Figure 17 ] Figure 17 is a perspective view of a scraper of a sealing assembly according to a fourth embodiment of the present invention;

[0070] [ Figure 18 ] Figure 18 yes Figure 17 Detailed perspective view of the scraper in;

[0071] [ Figure 19 ] Figure 19 yes Figure 17 Detailed top view of the scraper in FIG;

[0072] [ Figure 20 ] Figure 20 yes Figure 17 Detailed side view of the scraper in;

[0073] [ Figure 21 ] Figure 21 yes Figure 17 Detailed front view of the scraper in . DETAILED DESCRIPTION

[0074] Figure 1A twin-flow turbine engine 32 is shown, generally comprising, from upstream to downstream in the direction of gas flow, a ducted fan 33 and an engine, which includes a low-pressure compressor 34, a high-pressure compressor 35, a combustor 36, a high-pressure turbine 37, and a low-pressure turbine 38. The rotors of the low-pressure compressor 34 and the low-pressure turbine 38 are connected by a low-pressure shaft 39, together forming the low-pressure main body. The rotors of the high-pressure compressor 35 and the high-pressure turbine 37 are connected by a high-pressure shaft 40, together forming the high-pressure main body. The low-pressure shaft 39 and the high-pressure shaft 40 are coaxial and rotatable about an axis of rotation X'.

[0075] The air flow generated by the fan is divided by the fixed structure of the turbine engine 32 into a primary air flow F1 and a secondary air flow F2 , the primary air flow entering the primary duct 41 of the engine and the secondary air flow flowing into the secondary duct 42 arranged around the engine.

[0076] Figures 2 to 21 A seal assembly 1 for a turbine engine 32 is shown, comprising a first element 2 and a second element 3. The first and second elements 2, 3 are concentric and rotate relative to each other about an axis of rotation X. The seal assembly 1 includes at least one scraper 4a-4d and an abradable member 5. The scrapers 4a-4d are annular and carried by the first element 2. The scrapers 4a-4d extend radially toward the abradable member 5 and continuously about the axis of rotation X. The abradable member 5 is annular and carried by the second element 3. The abradable member 5 extends tangentially opposite the scrapers 4a-4d.

[0077] In the present application, “axial” or “axially” refers to any direction parallel to the axis of rotation X, and “radial” or “radially” refers to any direction perpendicular to the axis of rotation X.

[0078] Furthermore, according to the convention in this application, the terms “inner”, “outer”, “inner” and “outer” are defined radially relative to the axis X of rotation.

[0079] In a first configuration, the first element 2 is rotatable about an axis of rotation X, while the second element 3 is fixed. The second element 3 extends around the first element 2. In this configuration, the first element 2 of the seal assembly is, for example, a bottle disposed between two movable wheels of turbines 37, 28 of a turbine engine 32, while the second element 3 is a distributor of the respective turbine. In this example, the axis of rotation X of the seal assembly is coaxial with the axis of rotation X' of the turbine engine 32.

[0080] In the second configuration, the first element is rotatable around the axis of rotation X, while the second element is fixed. The first element extends around the second element.

[0081] In a third configuration, the first element is rotatable in a first rotational direction, the second element is rotatable in a second rotational direction opposite the first rotational direction, and the first and second elements rotate in opposite directions.

[0082] The embodiment shown in the figures corresponds to a first configuration, ie the first element 2 is rotatable about the axis of rotation X, whereas the second element 3 is fixed. The second element 3 extends around the first element 2 .

[0083] According to the embodiment shown in the figures, the sealing assembly 1 comprises a single scraper 4a-4d.

[0084] Of course, the sealing assembly may include a plurality of scrapers. The scrapers are then carried by the first element. The wearable member extends tangentially opposite to each scraper. Advantageously, each scraper includes the technical features of the present invention.

[0085] According to the embodiment shown in the figures, the first element 2 and the scrapers 4a-4d form the rotor portion of the seal assembly 1. The first element 2, which carries the scrapers 4a-4d, is in the form of a base plate. The scrapers 4a-4d are arranged on the exterior of the first element 2. The scrapers 4a-4d extend radially outward from the first element 2, i.e., toward the abradable member 5. The first element 2 has a rectangular cross-section and is integrally formed with the bodies of the scrapers 4a-4d.

[0086] The scrapers 4a - 4d comprise an annular body 7 extending continuously around the axis of rotation X. The body 7 comprises a base 8 adjoining the first element 2 and a top defined by an outer surface 9 . The body 7 is laterally defined by two side surfaces 10 .

[0087] According to the embodiment shown in the figures, the second element 3 and the wearable member 5 form the stator portion of the seal assembly 1. The second element 3, which carries the wearable member 5, is in the form of a ring. The wearable member 5 is arranged inside the second element 3. The wearable member 5 extends around the scrapers 4a-4d. The second element 3 has a rectangular cross-section and is separate from the wearable member 5, which is mounted on the second element 3.

[0088] The wearable member 5 is annular and is formed of a wearable material. For the sake of clarity, the second element 3 and the wearable member 5 are not shown in FIG. Figures 12 to 21 As shown in FIG, the second element and the wearable member are Figures 2 to 21 is the same throughout the entire assembly.

[0089] The wearable component 5 may be in the form of a homogeneous or non-homogeneous layer (coating or lining) obtained by thermal spraying, in particular plasma spraying. This layer is made of a CoNiCrAlY alloy, for example.

[0090] The abradable member 5 may also be in the form of a microporous structure or a honeycomb structure.

[0091] Generally, the advantage of honeycomb structures is that they can withstand higher temperatures than dense layer structures. However, honeycomb structures usually cause additional load losses due to the presence of cells.

[0092] The scrapers 4a-4d comprise main angular sections 11 (hereinafter referred to as "main sections"), each extending tangentially along a main angular sector 11'. The main sections 11 each have a first constant profile 12 in cross section.

[0093] According to the embodiment shown in the figures, the first constant profile 12 common to the assembly of main sections 11 is substantially triangular (see Figure 6 ). Then, at the main section 11, the body 7 of the scraper 4a-4d gradually becomes thinner from the base 8 to the top (defined by the outer surface 9).

[0094] The embodiment shown in the figures is in no way limiting; the first constant profile 12 common to the components of the main section 11 may of course have another shape in cross section, for example a trapezoid.

[0095] The main principal axis sector 11 ′ of each main section 11 is defined in particular by an angle α at the center. The main principal axis sector 11 ′ is shown in the figure as a dashed line.

[0096] According to the present invention, the scrapers 4a-4d further include secondary angular segments 13 (hereinafter referred to as "secondary segments"), each of which extends tangentially along a secondary angular sector 13'. Each secondary segment 13 has a second profile 14 having a cross-sectional area different from the first profile 12. The number of secondary angular segments 13 is equal to the number of primary segments 11. The secondary angular segments 13 are interposed between the primary segments 11.

[0097] The scraper 4 a - 4 d according to the invention therefore comprises alternating (or alternating consecutive) main sections 11 and secondary sections 13 , in other words, two consecutive main sections 11 are separated from each other by a secondary section 13 .

[0098] The alternation of the main and secondary sectors 11, 13 creates a discontinuity around the axis of rotation X, which facilitates the removal of the wearable element 5 and the removal of the abradable material chips. Such a discontinuity also makes it possible to avoid prolonged contact between the scrapers 4a-4d and the wearable element 5 and thus limit the heating caused by the contact.

[0099] In particular, a secondary angular sector 13' of each secondary section 13 is defined by an angle β at the centre. The secondary angular sector 13' is shown in dashed lines in the figure.

[0100] The number of primary and secondary segments per scraper may vary and depends on a number of parameters, in particular the material, the second profile and the rotational speed of the first element.

[0101] The sub-segments may have different geometrical and dimensional characteristics.

[0102] The secondary sections may be identical in groups (two, three, etc.) and evenly distributed around the axis of rotation X in order to balance the first element, ie to avoid imbalances.

[0103] Advantageously, the components of the sub-sections are identical to one another in order to balance the first element.

[0104] Advantageously, the secondary sections are evenly distributed around the axis of rotation X in order to balance the first element.

[0105] Advantageously, the scraper has a median plane of symmetry M perpendicular to the axis of rotation X, in order to balance the first element.

[0106] The second profile 14 of the secondary section 13 differs from the first profile 12 common to the main section 11 .

[0107] The second profile of the secondary section may be constant from one angular position to another.

[0108] Advantageously, the second profile of the secondary section varies from one angular position to another.The variation of the second profile makes it possible to prevent prolonged contact between the scraper and the abradable member.

[0109] Advantageously, each sub-segment includes at least one sharp edge (sharp edge, cutting edge or protruding edge). Such an edge makes it easier to cut the abradable member during contact and thus limits the heating caused by the contact between the scraper and the abradable member. To maximize the cutting, the sharp edge can be parallel to the axis of rotation X or inclined at an acute angle relative to the axis of rotation X. For example, the sharp edge can be obtained by adding or removing material from the body of the scraper. The sharp edge can also be obtained by adding a thin plate to the body of the scraper.

[0110] Each sub-segment may include a first groove that opens radially outward. The first groove of each sub-segment may open to at least one side surface of the scraper. The first groove of each sub-segment may be in the form of a circular segment. The first groove of each sub-segment may form a flat portion on the outer surface of the scraper.

[0111] Each sub-segment may comprise a second groove symmetrical to the first groove relative to a median plane M of the wiper. The median plane M is perpendicular to the axis of rotation X of the sealing assembly.

[0112] The one or more grooves create one or more voids that help evacuate debris of abradable material from the seal assembly and thereby limit contact-induced heating.

[0113] Each sub-segment may include a thin sheet mounted on the outer surface of the body of the scraper. The thin sheet may include a base and two opposing wings each extending from the base. The base is then supported on the outer surface of the body, and each of the wings is supported on a side surface of the body.

[0114] according to Figures 2 to 6 In the first embodiment shown, the wiper 4a of the sealing assembly 1 comprises three identical subsegments 13 evenly distributed around the axis of rotation X. The sub-angular sector 13' of each subsegment 13 has an angle β at the centre which is approximately 12°.

[0115] As shown in the figure, especially Figure 5 As shown, each sub-segment 13 has a T-shaped second contour 14 in cross section.

[0116] More precisely, each subsegment 13 includes two grooves 17a, 18a symmetrically relative to the midplane M of the scraper 4a. Each subsegment 13 (or sub-angular sector 13') is angularly defined by each tangential end of the grooves 17a, 18a. Each groove 17a, 18a opens radially outward and opens onto the side surface 10 of the body 7 of the scraper 4a. Each groove 17a, 18a is blind-closed (or has no opening), meaning that the two grooves 17a, 18a do not communicate with each other. Each groove 17a, 18a is shaped like a circular segment. Therefore, the body 7 includes a central peak 21 (centered on the midplane M) laterally defined by each groove 17a, 18a. Each groove 17a, 18a is defined by a sharp edge 15a. The sharp edge 15a of each groove 17a, 18a has a closed curved profile. Each groove 17a, 18a includes a bottom 22 with a connecting fillet 23.

[0117] according to Figures 7 to 11 In the second embodiment shown, the wiper 4b of the sealing assembly 1 comprises four identical subsegments 13 evenly distributed around the axis of rotation X. The sub-angular sector 13' of each subsegment 13 has an angle β at the centre which is approximately 25°.

[0118] As shown in the figure, especially Figure 10 and Figure 11 As shown, each sub-segment 13 has a trapezoidal second contour 14 in cross section.

[0119] More specifically, each subsegment 13 includes a continuous or open groove 17b. Each subsegment 13 (or sub-angular sector 13') is angularly defined by each tangential end of the groove 17b. The groove 17b forms a flat portion 24 (or flat surface) on the outer surface 9 of the scraper 4b. The flat portion 24 is tangentially defined by two sharp edges 15b, each in the form of a sharp ridge. The sharp edges 15b are generally parallel to the axis of rotation X.

[0120] The second embodiment has the advantage of being simple to manufacture.

[0121] According to Figures 12 to 16 In the third embodiment shown, the wiper 4c of the sealing assembly 1 comprises six identical subsegments 13 evenly distributed around the axis of rotation X. The sub-angular sector 13' of each subsegment 13 has an angle β at the centre which is approximately 15°.

[0122] As shown in the figure, each sub-segment 13 has a second profile 14 that changes in a complex manner in cross section.

[0123] More precisely, each secondary segment 13 includes two grooves 17c, 18c that are symmetrical relative to the median plane M of the scraper 4c. Each secondary segment 13 (or secondary angular sector 13') is angularly defined by each tangential end of each groove 17c, 18c. Each groove 17c, 18c opens radially outward and opens into the side surface 10 of the body 7 of the scraper 4c. Each groove 17c, 18c is partially or partially open (or through) to form a channel 25 or connection between the two grooves 17c, 18c. Thus, the body 7 includes a tapered segment 26 (or peak) and a pointed segment 27, separated from each other by the channel 25 and adjoined by the grooves 17c, 18c. The tapered segment 26 includes a biconcave stretch 28 and a biconvex stretch 29. The biconcave stretch 28 is adjacent to the main segment 11, and the biconvex stretch 29 is arranged tangentially between the biconcave stretch 28 and the channel 25. The channel 25 is tangentially defined by two radial sharp ridges, a first sharp ridge of the pointed section 27 and a second sharp ridge of the biconvex extension 29 of the tapered section 26. Each groove 17c, 18c is defined by a sharp edge 15c. The sharp edge 15c of each groove 17c, 18c has an open curved profile. Each groove 17c, 18c includes a bottom 30 having a connecting fillet 31.

[0124] The grooves described in the first, second and third embodiments can be produced by machining on a machine tool (e.g., a CNC machine tool) through various operations. If one or more scrapers are coated with a protective coating, the grooves can be machined before or after the protective coating is applied.

[0125] according to Figures 17 to 21In the fourth embodiment shown, the wiper 4d of the sealing assembly 1 comprises eight identical sub-segments 13 evenly distributed around the axis of rotation X. The sub-angular sector 13' of each sub-segment 13 has an angle β at the centre which is approximately 10°.

[0126] As shown, each sub-segment 13 has a constant complex second profile 14 in cross section.

[0127] More specifically, each sub-segment 13 includes a thin plate 16 mounted on the outer surface 9 of the main body 7 of the scraper 4d. Each sub-segment 13 (or sub-angular sector 13') is angularly defined by each tangential end of the thin plate 16. The thin plate 16 has a V-shaped profile in cross section. The thin plate 16 overlaps the main body 7 of the scraper 4d. The thin plate 16 includes a base 19 and two opposite wings 20, each extending from the base 19. The base 19 is then supported on the outer surface 9 of the main body 7, and each wing 20 is supported on the side surface 10 of the main body 7. The thin plate 16 has a constant thickness, but can be variable. The base 19 is tangentially defined by two sharp edges 15d, each of which is in the form of a sharp ridge. The sharp edges 15d are roughly parallel to the axis of rotation X.

[0128] In the assembly of the embodiment, the components of the sealing assembly are generally made of one or more heat-resistant materials, such as metal materials (high-performance alloys or high-temperature alloys) or ceramic materials.

[0129] The material or materials used will depend, inter alia, on the temperature of the environment to which the sealing assembly is exposed.

[0130] One or more scrapers may include one or more protective surface coatings. The one or more protective coatings are generally capable of protecting the scraper from wear and temperature during contact. The protective coating includes, for example, titanium dioxide.

[0131] The body of the scraper may be unitary (or in one piece).

Claims

1. A sealing assembly (1) for a turbine engine (32), comprising a first element (2) and a second element (3), the first element (2) and the second element (3) being concentric and rotatable relative to each other about an axis of rotation (X), the sealing assembly (1) comprising at least one first scraper and an abradable member (5), the first scraper being annular in shape and carried by the first element (2), the first scraper extending radially towards the abradable member (5) and continuously about the axis of rotation (X), the abradable member (5) being annular in shape and carried by the second element (3), the abradable member (5) extending tangentially opposite to the first scraper, the first scraper comprising principal axis segments (11), each principal axis segment extending tangentially along a principal axis sector (11'), the principal axis segments (11) each having a constant first profile (12) in cross section, characterized in that The first scraper comprises secondary angular segments (13), each of which extends tangentially along a secondary angular sector (13'), each of which has a second profile (14) different from the first profile (12) in cross section, the number of the secondary angular segments (13) being equal to the number of the main angular segments (11), and the secondary angular segments (13) being inserted between the main angular segments (11), Each secondary angular segment (13) comprises a first groove opening radially outward and a second groove symmetrical to the first groove relative to a middle plane (M) of the first scraper, the middle plane (M) being perpendicular to the rotation axis (X) of the sealing assembly (1), Each secondary corner segment (13) comprises a central peak (21, 26) centered on the middle plane (M) of the first scraper, and the central peak (21, 26) is laterally delimited by each of the first groove and the second groove.

2. The sealing assembly (1) according to claim 1, characterized in that The second profile (14) of at least one of the secondary angular segments (13) varies from one angular position to another.

3. The sealing assembly (1) according to claim 1 or 2, characterized in that Each minor corner segment (13) comprises at least one sharp edge (15a, 15c).

4. The sealing assembly (1) according to claim 1, characterized in that The first groove opens onto at least one side surface (10) of the first scraper.

5. The sealing assembly (1) according to claim 1, characterized in that The first groove is in the form of a circular segment.

6. The sealing assembly (1) according to claim 1 or 2, characterized in that The sealing assembly (1) comprises a second scraper which is independent of the first scraper and axially away from the first scraper, and the abradable member (5) extends tangentially opposite to the second scraper.

7. A turbine engine (32) comprising at least one sealing assembly (1) according to any one of claims 1 to 6.

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