Protective and sealing device for turbine wheel

Abstract

Wheel (14) of a turbine (10) of a turbomachine with a longitudinal axis comprising: a disc (18) comprising at its external periphery longitudinal ribs delimiting longitudinal cells; a plurality of blades carried by the disc (18); a plurality of protection and sealing members (500, 500', 500''), each protection and sealing member (500) comprising: a first part (510) mounted in a longitudinal cell (20); at least one second portion (520) connected to a first axial end (514) of the first portion (510) and extending circumferentially so that a first lateral portion (524) is applied to an end face of a first longitudinal rib (23a) and an opposite second lateral portion (526) is applied to an end face of a second longitudinal rib (23b). Abstract figure: Figure 5.

Description

Title of the invention: Protective and sealing member for turbine wheel Technical field

[0001] The present disclosure relates to the field of turbomachine turbine protection and sealing members. Prior art

[0002] Known from the prior art is a turbine of a turbomachine as illustrated in [Fig.l]. The turbomachine comprises a longitudinal axis parallel to the X axis shown.

[0003] The turbine 10 is arranged downstream of an annular combustion chamber 12 and comprises several wheels 14 arranged alternately with annular rows of fixed blades 16.

[0004] The wheels 14 are driven in rotation by the flow of hot gases leaving the combustion chamber 12. A wheel 14 comprises a disc 18 having on its external periphery a plurality of longitudinal dovetail or similar cells 20 in which blade roots 22, called moving blades 24, are axially engaged and radially retained by shape cooperation.

[0005] To this end, the blade roots 22 have a bulbous shape ensuring their radial retention in the cells 20 of the disc 18, which are delimited laterally (circumferentially) by ribs 23.

[0006] As illustrated in [Fig.2], a blade 24 thus comprises a root 22 connected externally to a platform 26 extending circumferentially, and a blade 28 receiving the flow of hot gases and extending radially from the platform 26.

[0007] The platforms 26 extend circumferentially end to end so as to form an annular wall internally delimiting (radially inside) the annular flow vein of the hot gases and preventing the reintroduction of hot gases at the level of the internal periphery of the disc 18.

[0008] Each blade root 22 comprises at its upstream and downstream ends a projecting portion 30 extending circumferentially and arranged immediately above a rib 23 of the disc 18, also called a tooth 23 of the disc 18 ([Fig. 3]). These projecting portions or walls 30 or stilts 30 come to bear on the ribs 23 of the disc 18, which makes it possible to limit the tilting in the circumferential direction of the blade roots 22 during operation. These walls 30 also make it possible to limit the reintroduction of hot gases between the platforms 26 and the ribs 23, thus avoiding significant heating of the disc 18.

[0009] The wheels 14 carrying the blades 24 arranged alternately with the annular rows of fixed blades 16 are arranged from upstream to downstream (axially) in consecutive stages. [Fig. 3] illustrates the first stage 32 and the second stage 34 of the turbine 10 of [Fig. 1].

[0010] As illustrated in more detail in [Fig.4A], the turbine 10 comprises an axial retaining ring 36 (shown in color in [Fig.4A]) of the first stage wheel 32, the disc 38 carrying moving blades 24 and the axial retaining ring 36 bearing on the disc 38 of the first stage wheel 32.

[0011] The cooling circuit for the bottom of the longitudinal cells requires the presence of a movable ring 42 (shown in color in [Fig.4B]) which allows said cooling to be ensured by sealing.

[0012] As illustrated in more detail in [Fig.4B], the turbine 10 comprises such a movable ring 42 arranged axially between the first stage 32 and the second stage 34.

[0013] The movable ring 42 is held by a bolted connection 44 between the first stage disc 38 and the second stage disc 46 and allows tightening of the retaining ring 36 arranged upstream. In this way, the retaining ring 36 is pinched by the ribs 23 of the first stage disc 38 and the movable ring 42.

[0014] In operation, the blades 24 are subjected to vibrations generating contact and friction forces between the blade roots 22 and the disc 18, in particular at the level of the ribs 23 and the cells 20 of the disc 18.

[0015] It is known from the prior art to use foils (metal sheets with a particular shape) arranged at the contact interface between the blade roots and the disc in order to protect said contact interface.

[0016] It has been found that frictional contact forces also occur at the contact interface between the downstream faces of the longitudinal ribs and the retaining ring, on the one hand, and at the contact interface between the upstream faces of the longitudinal ribs and the movable ring, on the other hand.

[0017] This friction between the axially facing parts can damage the longitudinal ribs to the point of preventing the proper functioning of the disc comprising said ribs, and therefore reduces the service life of the wheel of said disc.

[0018] The present document proposes a solution to the problems of the prior art cited above. Summary

[0019] For this purpose, the present document proposes a turbine wheel for a turbomachine with a longitudinal axis comprising: - a disc comprising at its external periphery longitudinal ribs delimiting longitudinal cells;

[0020] - a plurality of blades carried by the disc, each blade having an engaged root axially and radially retained in a longitudinal cell of the disc;

[0021] - a plurality of protection and sealing members, each protection member and sealing comprising:

[0022] — a first part mounted and retained by shape cooperation in a cell longitudinal radially between the foot and said longitudinal cell, said first part being capable of protecting the sides of the longitudinal cell and the foot;

[0023] — at least one second part connected to a first axial end of thefirst part and extending circumferentially so that a first lateral portion is applied to an end face of a first longitudinal rib and a second opposite lateral portion is applied to an end face of a second longitudinal rib circumferentially adjacent to the first longitudinal rib, said at least one second part being capable of protecting the end faces of the first longitudinal rib and of the second longitudinal rib, said first lateral portion of said protection and sealing member cooperating in a sealing manner with a second lateral portion of a first protection and sealing member circumferentially adjacent to said protection and sealing member,said second lateral portion of said protection and sealing member cooperating in a sealing manner with a first lateral portion of a second protection member circumferentially adjacent to said protection and sealing member, so as to form a sealing ring for the longitudinal cells and for protecting the longitudinal ribs.

[0024] The terms axial, radial and circumferential are defined relative to the longitudinal axis of the turbomachine.

[0025] Taken together, the second parts of the protection and sealing members arranged end to end form a sealing ring which is composed of several circumferential segments, each circumferential segment corresponding to a second part of a protection and sealing member.

[0026] Each protection and sealing member fulfills the following functions: - Protection of the sides of the longitudinal cell and the foot by means of the first part; - Protection of the end faces of the first and second longitudinal ribs by means of the first and second lateral portions of said at least one second part. In this way, the protection and sealing member makes it possible to reduce possible contact wear by friction on the end faces of the longitudinal ribs with an axially facing element. In addition, the protection and sealing member prevents against possible impacts occurring on the end faces of the longitudinal ribs; - A seal at the longitudinal cells by means of said at least one second part extending circumferentially. In this way, leaks at the level of said longitudinal cells are limited.

[0027] The protective and sealing member may be a foil. By foil is meant a sheet metal that is foldable and can be shaped.

[0028] According to one embodiment, said at least one second part may comprise: - a second upstream part connected to the first axial end (an upstream end) of the first part; and - a second downstream portion connected to a second axial end (a downstream end) of the first portion, said first axial end being opposite the second axial end.

[0029] In this way, the upstream and downstream end faces of the first longitudinal rib and the second longitudinal rib are protected.

[0030] In addition, a sealing ring for the longitudinal cells and for protecting the upstream longitudinal ribs, as well as a sealing ring for the longitudinal cells and for protecting the downstream longitudinal ribs are formed.

[0031] According to another embodiment, in the case of strictly longitudinal ribs and cells, at least one protection and sealing member, preferably each protection and sealing member, may be symmetrical with respect to a radial plane comprising the longitudinal axis and the middle of the longitudinal cell.

[0032] In other words, the first part and said at least one second part have a plane of symmetry which is the radial plane.

[0033] In this way, the protection and sealing member provides the same protection for the first longitudinal rib and for the second longitudinal rib and facilitates the design.

[0034] Said first lateral portion of said protection and sealing member can cooperate with the second lateral portion of the first circumferentially adjacent protection and sealing member and said second lateral portion of said protection and sealing member can cooperate with a first lateral portion of the second circumferentially adjacent protection and sealing member, so as to form circumferential clearances.

[0035] In other words, there is no circumferential overlap between the protection and sealing members. More particularly, a lateral edge of a first lateral portion is spaced by a circumferential clearance with a lateral edge of a second lateral portion opposite circumferentially.

[0036] The manufacturing process of such a protective and sealing member is simplified; it only requires simple cutting.

[0037] In one configuration, each second portion may have the shape of a quadrilateral such that the circumferential clearance is constant over the radial height of each second portion.

[0038] More particularly, each second part may comprise a radially inner edge and a radially outer edge connected at their circumferential ends by lateral edges. Thus, a lateral edge of a second part of a first protection and sealing member is arranged with a clearance jl circumferentially opposite a lateral edge of a second part of a second protection and sealing member circumferentially adjacent to the first protection and sealing member.

[0039] For this clearance to be substantially constant, the angle formed between the lateral edge and the radially external edge can be between 85° and 89°.

[0040] For example, the angle formed between the lateral edge and the radially outer edge may be equal to 88.75°.

[0041] In other words, said angle makes it possible to take into account the revolution of the sealing ring of the longitudinal cells and the protection of the longitudinal ribs.

[0042] Optionally, said angle may be adapted according to the number of longitudinal cells of the disc. For example, said angle may be equal to 90 - (360 / (2*N)), with N the number of longitudinal cells of the disc.

[0043] Said first lateral portion of said protection and sealing member can cooperate in shape with the second lateral portion of the first circumferentially adjacent protection and sealing member and said second lateral portion of said protection and sealing member can cooperate in shape with the first lateral portion of the second circumferentially adjacent protection and sealing member.

[0044] The shape cooperation between the protection and sealing member with the first adjacent protection and sealing member and the second adjacent protection and sealing member makes it possible to create overlapping zones. This improves the sealing function of the sealing ring of the longitudinal cells and the protection of the longitudinal ribs and therefore reduces leaks.

[0045] Said at least one second part may comprise a base from which the first lateral portion and the second lateral portion extend, the first lateral portion and the second lateral portion comprising a thickness equal to half a thickness of the base, the first lateral portion extending from a first axial face of the base, the second lateral portion extending from a second axial face of the base, said second axial face being opposite the first axial face.

[0046] The shape cooperation is thus achieved by interlocking between a first lateral portion and a second complementary lateral portion. The thickness of the first and second lateral portions can be achieved by removing material.

[0047] The first axial face of the base may be an end face of the protection and sealing member so that the first lateral portion is on the extrados side and the second lateral portion is on the intrados side.

[0048] In this way, the sealing provided by the protection and sealing member is improved.

[0049] The first side portion and the second side portion may be bevel-shaped.

[0050] The overlap formed by the shape cooperation of the lateral portions is thus progressive, the thickness of the bevel in fact decreases progressively up to its circumferential end. In this way, a fluid overlap is allowed at the level of the overlap zone, and therefore the sealing of the sealing ring of the longitudinal cells and protection of the longitudinal ribs is improved and therefore leaks are reduced.

[0051] Furthermore, the axial retaining ring or the movable ring (depending on the upstream and / or downstream arrangement of the second part(s)) exerts a contact force on the lateral portion extending from the end face of the protection and sealing member. This makes it possible to press the first and second lateral portions against the overlapping zones and therefore to further improve the sealing of the sealing ring of the longitudinal cells and the protection ring of the longitudinal ribs.

[0052] The first part may comprise at least one joining tab to said at least one second part, said at least one joining tab comprising the first axial end of the first part.

[0053] The first portion may comprise an axial retention tab for the foot, which first portion may comprise a second axial end opposite the first axial end.

[0054] The present document may also relate to a turbine, such as a low-pressure turbine, for an aircraft turbomachine with a longitudinal axis comprising a wheel according to the aforementioned type, a movable ring arranged upstream of the wheel and / or an axial retaining ring for the blade, such that the movable ring and / or the axial retaining ring for the blade are in axial contact with the first lateral portion and the second lateral portion of each protection and sealing member.

[0055] The first axial end of the first part may be an upstream end. In this case, the second part connected to the upstream end makes it possible to reduce the contact wear by friction between the upstream faces of the longitudinal ribs and a movable ring ensuring the cooling of the cell bottoms.

[0056] The first axial end of the first part may be a downstream end. In this case, the second part connected to the downstream end makes it possible to reduce contact wear. by friction between the downstream faces of the longitudinal ribs and an axial retaining ring of the blade.

[0057] Optionally, a second upstream portion may be connected to the upstream end of the first portion and a second downstream portion may be connected to the downstream end of the first portion. Thus, protection and sealing both upstream and downstream are ensured.

[0058] In other words, the wheel may comprise a first and a second sealing ring for the longitudinal cells and for protecting the longitudinal ribs, which are arranged axially on either side of the wheel.

[0059] This document may also relate to a longitudinal axis turbomachine, such as an aircraft turbojet or turboprop, comprising a turbine according to the aforementioned type.

[0060] Said turbomachine may be a turbojet or a turboprop.

[0061] This document may also relate to an aircraft comprising at least one turbomachine of the aforementioned type.

[0062] Said aircraft may be an airplane or a rotary-wing aircraft.

[0063] The features set forth in this document may, optionally, be implemented independently of one another or in combination with one another. Brief description of the drawings

[0064] Other characteristics, details and advantages will appear on reading the detailed description below, and on analyzing the attached drawings, in which:

[0065] [Fig-1] is a partial schematic half-view in section of a turbomachine turbine according to the prior art;

[0066] [Fig.2] is a schematic view from upstream of the connection between the blade roots and the disc of a wheel of the turbine of [Fig. 1];

[0067] [Fig.3] is a detail view of the turbine of [Fig.l];

[0068] [Fig.4A] is a detail view of a first stage of the turbine of [Fig.3];

[0069] [Fig.4B] is a detail view of a second stage of the turbine of [Fig.3];

[0070] [Fig.5] is a perspective view of a protection and sealing member according to a first embodiment of the present document;

[0071] [Fig.6] is a flattened view of the protection and sealing member of [Fig.5];

[0072] [Fig.7] is a perspective view of a portion of a turbine wheel having three circumferentially adjacent protection and sealing members according to the embodiment of [Fig.5];

[0073] [Fig. 8] is a front view of the junction between two lateral portions of two circumferentially adjacent protection and sealing members of [Fig.7];

[0074] [Fig.9] is a perspective view of a protective and sealing member according to a second embodiment of this document;

[0075] [Fig. 10] is a top view of a second part of the protective member and sealing of [Fig.9];

[0076] [Fig. 11] is a perspective view of a portion of a turbine wheel comprising three circumferentially adjacent protection and sealing members according to the embodiment of [Fig.9];

[0077] [Fig. 12] is a top view of the junction between two lateral portions of two circumferentially adjacent protective and sealing members of [Fig. 11];

[0078] [Fig. 13] is a perspective view of a protective and sealing member according to a third embodiment of this document;

[0079] [Fig. 14] is a top view of a second part of the protective member and sealing of [Fig. 13];

[0080] [Fig. 15] is a perspective view of a portion of a turbine wheel comprising three circumferentially adjacent protection and sealing members according to the embodiment of [Fig. 13];

[0081] [Fig. 16] is a top view of the junction between two lateral portions of two circumferentially adjacent protective and sealing members of [Fig.13]. Description of the embodiments

[0082] Figures 5 and 6 illustrate a first embodiment of the protection and sealing member.

[0083] The protection and sealing member 500 comprises a first part 510.

[0084] The first part 510 is dovetail-shaped so as to be of complementary shape to the blade root that it envelops. The first part 510 comprises a base 511 from which circumferential bearing surfaces 517 extend circumferentially on either side.

[0085] The circumferential bearing surfaces 517 are positioned at the contact interface between the flanks of the blade root and the two circumferentially adjacent longitudinal ribs.

[0086] The X' axis is an axis parallel to the longitudinal axis of the turbomachine and the X axis of [Fig.l].

[0087] The first part 510 further comprises axially on either side a joining tab 512 comprising a first axial end 514, and an axial retention tab 516 comprising a second axial end 518 which is arranged axially opposite the first axial end 514.

[0088] [Fig.5] shows the axial retention tab 516 in a state before being folded to ensure its axial retention function of the blade root.

[0089] The protection and sealing member 500 comprises a second part 520 directly connected to the first axial end 514 of the joining tab 512 of the first part 510.

[0090] The second part 520 is substantially rectangular and forms a protective plate. It comprises a base 522 from which a first lateral portion 524 and a second lateral portion 526 extend circumferentially on either side. In other words, the first lateral portion 524 extends circumferentially from a first lateral edge 522a of the base 522 and the second lateral portion 526 extends circumferentially from a second lateral edge 522b of the base 522.

[0091] The radially external and lateral angle of the first lateral portion 524 is an angle α and the radially external and lateral angle of the second lateral portion is an angle [3. In other words, a lateral edge 524a of the first lateral portion 524 and a radially external edge 524b of the first lateral portion 524 form an angle α, and a lateral edge 526a of the second lateral portion 526 and a radially external edge 526b of the second lateral portion 526 form an angle [3.

[0092] In the illustrated embodiment, the angles a and [3 are identical.

[0093] The first part 510 and the second part 520 have a plane of symmetry which is radial and intersects the X' axis.

[0094] In other words, in the flattened view of [Fig.6], the first part 510 and the second part 520 have an axis of symmetry which is the X' axis.

[0095] Reference is now made to Figures 7 and 8 which illustrate the protection and sealing member 500, a first circumferentially adjacent protection and sealing member 500' and a first lateral portion 524” of a second part 520” of a second circumferentially adjacent protection and sealing member 500”, said protection and sealing members being protection and sealing members according to the embodiment of [Fig.5] (the first embodiment).

[0096] The protection and sealing member 500 is arranged circumferentially between the first protection and sealing member 500' and the second protection and sealing member 500”, so that the first lateral portion 524 of the protection and sealing member 500 is circumferentially opposite and cooperates with the second lateral portion 526' of the first protection and sealing member 500' and so that the second lateral portion 526 of the protection and sealing member 500 is circumferentially opposite and cooperates with the first lateral portion 524' of the second protection and sealing member 500”.

[0097] The protection and sealing member 500 envelops the bottom and the sides of a corresponding blade root 22 so as to protect it from contact with a first longitudinal rib 23a and a second longitudinal rib 23b. The longitudinal ribs 23a, 23b delimit a longitudinal cell 20 which receives the blade root 22 enveloped by the protection and sealing member 500.

[0098] As illustrated in [Fig.8], the first lateral portion 524 of the protection and sealing member 500 cooperates with the second lateral portion 526' of the first protection and sealing member 500' so that there is a circumferential clearance j 1 between the lateral edges 524a, 526a' of the first lateral portion 524 and of the second lateral portion 526', the lateral edges 524a, 526a' being circumferentially opposite each other.

[0099] The lateral edge 526a' of the second lateral portion 526' forms with a radially external edge 526b' of the second lateral portion 526' of the first protection and sealing member 500' an angle [3' (similarly to the angle |3).

[0100] In order to minimize leaks and therefore to minimize the circumferential clearance j 1, the angles a, [3' can be adjusted. This is of course also the case for the angles a', [3, a” and |3” (some being not shown, but similar to a and [3 for the first protection and sealing member 500' or the second protection and sealing member 500”), or even any angle of a protection and sealing member formed by a radially external edge of a corresponding second part and a lateral edge of said corresponding second part.

[0101] The angle values ​​depend on the number of blades in the wheel (and therefore the number of cells): the more blades there are, the closer the lateral edges will come to a configuration in which they are parallel, in order to follow the annular shape of the disc. In other words, the more blades there are, the more the angles will tend towards 90°.

[0102] For example, we can have: 0 = 90 - (360 / (2*N)), with N the number of longitudinal cells of the disc, 0 being any angle among a, [3, a', |3', a” and |3”, or even any angle of a protection and sealing member formed by a radially external edge of a corresponding second part and a lateral edge of said corresponding second part.

[0103] Figures 9 and 10 illustrate a second embodiment of the protection and sealing member 500.

[0104] In this embodiment, the first lateral portion 524 extends circumferentially from a first lateral edge 522a of the base 522 and a first axial end face 528 of the base 522 (external face, i.e. opening in a direction opposite to the first part 510), and the second lateral portion 526 extends circumferentially from a second lateral edge 522b of the base 522 and a second axial face 529 of the base 522 (internal face, i.e. opening towards the first part 510), which second axial face 529 is opposite the first axial face 528.

[0105] The first lateral portion 524 and the second lateral portion 526 have a thickness el equal to half the thickness e2 of the base 522. By thickness, we mean the axial dimension.

[0106] Reference is now made to Figures 11 to 13 which illustrate the protection and sealing member 500, a first circumferentially adjacent protection and sealing member 500' and a second portion 520” of a second circumferentially adjacent protection and sealing member 500”, said protection and sealing members being protection and sealing members according to the embodiment of [Fig.9] (the second embodiment).

[0107] The first lateral portion 524 of the protection and sealing member 500 cooperates with the second lateral portion 526' of the first protection and sealing member 500' and the second lateral portion 526 of the protection and sealing member 500 cooperates with the first lateral portion 524" of the second protection and sealing member 500" so as to form respective overlap zones 530, 532.

[0108] [Fig. 12] illustrates the overlap zone 530 which is formed by an axial overlap by contact between the first lateral portion 524 of the protection and sealing member 500 and the second lateral portion 526' of the first protection and sealing member 500', the second lateral portion 526' extending from a base 522' of a second part 520' of the first protection and sealing member 500').

[0109] In particular, this axial overlap is partial: the first lateral portion 524 extends partly axially opposite the second lateral portion 526' so that a circumferential clearance j2 exists between the lateral edge 524a of the first lateral portion 524 and the lateral edge 522b' of a base 522' of the first protection and sealing member 500'. This clearance j2 also exists between the lateral edge 526a' of the second lateral portion 526' and the lateral edge 522a of the base 522.

[0110] In operation, this configuration makes it possible to limit leaks since the overlap zone 530 is closed.

[0111] Figures 13 and 14 illustrate a third embodiment of the protection and sealing member.

[0112] In this embodiment, the first lateral portion 524 extends circumferentially from a first lateral edge 522a of the base 522 so as to form a first bevel 524.

[0113] As illustrated in detail in [Fig.14], the first bevel 524 has a thickness forming a right triangle whose segment 524d axially opposite the hypotenuse 524e extends circumferentially from a first axial end face 528 of the base 522.

[0114] Similarly, the second lateral portion 526 extends circumferentially from a second lateral edge 522b of the base 522 so as to form a second bevel 526.

[0115] The second bevel 526 has a thickness forming a right triangle whose segment 526d axially opposite the hypotenuse 526e extends circumferentially from a second axial end face 529 of the base 522 opposite the first axial face 528.

[0116] Reference is now made to Figures 15 and 16 which illustrate the protection and sealing member 500, a first circumferentially adjacent protection and sealing member 500' and a second portion 520” of a second circumferentially adjacent protection and sealing member 500”, said protection and sealing members being protection and sealing members according to the embodiment of [Fig. 13] (the third embodiment).

[0117] The first lateral portion 524 of the protection and sealing member 500 cooperates with the second lateral portion 526' of the first protection and sealing member 500' and the second lateral portion 526 of the protection and sealing member 500 cooperates with the first lateral portion 524" of the second protection and sealing member 500" so as to form respective overlap zones 534, 536.

[0118] [Fig. 16] illustrates the overlap zone 534 which is formed by an axial overlap by contact between the first bevel 524 of the protection and sealing member 500 and the second bevel 526' of the first circumferentially adjacent protection and sealing member 500'.

[0119] In particular, this overlap is an axial overlap by contact between the hypotenuse 524e of the first bevel 524 and a hypotenuse 526e' of a second bevel 526' of the first protection and sealing member 500', such that the lateral end 524a (i.e. the lateral edge 524a or the tip 524a) of the first bevel 524 is in contact with a lateral edge 522b' of a base 522' of the first protection and sealing member 500', and the lateral end 526a' (i.e. the lateral edge 526a' or the tip 526a') of the second bevel 526' is in contact with the lateral edge 522b of the base 522 of the protection and sealing member 500.

[0120] By the tip of a bevel is meant the point of intersection between the corresponding hypotenuse and the segment axially opposite said hypotenuse.

[0121] In operation, this configuration makes it possible to limit leaks since the overlap zone 534 is closed. In addition, the overlap zone 534 (as well as the overlap zone 536) is progressive, which creates a fluid overlap and improves sealing.

[0122] It is to be understood in the embodiments illustrated in Figures 5 to 16 that the characteristics of the sealing protection member 500 are transposable to the first and second circumferentially adjacent protection and sealing members 500', 500”.

Claims

1. Claims Wheel (14) of a turbine (10) of a longitudinal axis turbomachine comprising: - a disc (18) comprising at its external periphery longitudinal ribs delimiting longitudinal cells; - a plurality of blades carried by the disc (18), each blade comprising a root (22) axially engaged and radially retained in a longitudinal cell (20) of the disc (18); - a plurality of protection and sealing members (500, 500', 500”), each protection and sealing member (500) comprising: — a first part (510) mounted and retained by shape cooperation in a longitudinal cell (20) radially between the foot (22) and said longitudinal cell (20), said first part (510) being capable of protecting the sides of the longitudinal cell (20) and the foot (22); — at least one second part (520) connected to a first axial end (514) of the first part (510) and extending circumferentially so that a first lateral portion (524) is applied to an end face of a first longitudinal rib (23a) and an opposite second lateral portion (526) is applied to an end face of a second longitudinal rib (23b) circumferentially adjacent to the first longitudinal rib (23a), said at least one second part (520) being capable of protecting the end faces of the first longitudinal rib (23a) and of the second longitudinal rib (23b), said first lateral portion (524) of said protection and sealing member (500) cooperating in a sealing manner with a second lateral portion (526') of a first protection and sealing member (500') circumferentially adjacent to said protective and sealing member (500),said second lateral portion (526) of said protection and sealing member (500) cooperating in a sealing manner with a first lateral portion (524”) of a second protection member (500”) circumferentially adjacent to said protection and sealing member (500), so as to form a sealing ring for the longitudinal cells (20) and for protecting the longitudinal ribs (23).,

2. Wheel (14) of turbine (10) according to the preceding claim, in which said first lateral portion (524) of said protection and sealing member (500) cooperates with the second lateral portion (526') of the first circumferentially adjacent protection and sealing member (500') and said second lateral portion (526) of said protection and sealing member (500) cooperates with a first lateral portion (524”) of the second circumferentially adjacent protection and sealing member (500”), so as to form circumferential clearances (jl).

3. A turbine wheel (14) of a turbine (10) according to claim 1, wherein said first lateral portion (524) of said protective and sealing member (500) cooperates in shape with the second lateral portion (526') of the first circumferentially adjacent protective and sealing member (500') and said second lateral portion (526) of said protective and sealing member (500) cooperates in shape with the first lateral portion (524”) of the second circumferentially adjacent protective and sealing member (500”).

4. A turbine wheel (14) of a turbine (10) according to the preceding claim, wherein said at least one second portion (520) comprises a base (522) from which the first lateral portion (524) and the second lateral portion (526) extend, the first lateral portion (524) and the second lateral portion (526) comprising a thickness (el) equal to half a thickness (e2) of the base (522), the first lateral portion (524) extending from a first axial face (528) of the base (522), the second lateral portion (526) extending from a second axial face (529) of the base (522), said second axial face (529) being opposite the first axial face (528).

5. A turbine wheel (14) of a turbine (10) according to claim 3, wherein the first side portion (524) and the second side portion (526) are bevel-shaped.

6. A turbine wheel (14) of a turbine (10) according to any preceding claim, wherein the first portion (510) comprises at least one connecting tab (512) to said at least one second portion (520), said at least one connecting tab (512) comprising the first axial end (514) of the first portion (510).

7. Wheel (14) of a turbine (10) according to any one of the preceding claims, in which the first part (510) comprises an axial retention tab (516) of the foot (22), which first part (510) includes a second axial end (518) opposite the first axial end (514).

8. Turbine, such as a low-pressure turbine, for an aircraft turbomachine with a longitudinal axis comprising a wheel (14) according to any one of the preceding claims, a movable ring (42) arranged upstream of the wheel (14) and / or an axial retaining ring (36) of the blade (24), such that the movable ring (42) and / or the axial retaining ring (36) of the blade (24) are in axial contact with the first lateral portion (524) and the second lateral portion (526) of each protection and sealing member (500).

9. Longitudinal axis turbomachine, such as an aircraft turbojet or turboprop, comprising a turbine (10) according to the preceding claim.

10. Aircraft comprising at least one turbomachine according to the preceding claim.

Images