Assembly of a turbine turbine fan

Abstract

This document relates to a turbomachine assembly comprising a blower disk (102) rotating about a longitudinal axis and a low-pressure shaft (110) adapted to drive a low-pressure compressor rotor about the longitudinal axis, wherein the blower disk (102) comprises an outer radial shell (104) configured to receive blower blades, an inner radial shell (106) configured to be fitted onto the low-pressure shaft (110), and a hub (108) connecting the inner radial shell (106) to the outer radial shell (104). Figure to be published with the abbreviation: [Fig. 2]

Description

Title of the invention: Assembly of a turbine-bladed turbomachine blower Technical field of the invention

[0001] The present invention relates to an assembly on a turbomachine shaft of at least one bladed disc, for example of a blower, and a shaft connected to a low-pressure compressor. Prior art

[0002] Conventionally, the bladed disc of a turbomachine's fan and the rotor of its low-pressure compressor are fixed to the low-pressure compressor shaft by various flange systems. This assembly is configured to transmit the rotation of the compressor shaft to the fan and the rotor of the low-pressure compressor.

[0003] For example, document FR3066552 describes a turbomachine, the upstream part of which is shown in [Fig. 1], comprising a bladed disc 1 which has a plurality of blades A which are one piece with a disc part D. Said disc part D comprises a profiled body 4 and flange mounting lugs 5 which extend upstream of said body 4. The turbomachine includes a mounting flange 6 extending inside the body 4, downstream and in the direction of the low-pressure shaft 3.

[0004] The fixing flange 6 terminates in a cylindrical ferrule 8 with grooves which is engaged on an area 9 of the upstream part of the shaft 3 which has complementary grooves.

[0005] The grooves of the ferrule 8 which terminates the fixing flange 6 of the bladed disc and those of the zone 9 of the shaft 3 cooperate to ensure the rotational connection of the bladed disc 1 and the low pressure shaft 3. The rotor 2 of the low pressure compressor has an upstream flange 10 which defines a rotor disc and which carries several stages of movable blades 11.

[0006] The low-pressure compressor further comprises several stages of stator blades 12. The various stages of stator blades 12 and moving blades 11 are arranged alternately one after the other to define said low-pressure compressor.

[0007] This flange 10 terminates at the level of the shaft 3 by a cylindrical fixing ferrule 13 with grooves engaged on a second zone 14 with grooves which said low pressure shaft 3 presents upstream of the zone 9.

[0008] The splines of the cylinder 13 and those of the zone 14 cooperate to ensure a splined connection which locks in relative rotation the rotor 2 and the low pressure shaft 3.

[0009] This splined connection requires the machining of two centerings 15 and 17 to ensure coaxiality between the bladed disc 1 and the low pressure compressor.

[0010] The centering points 15 and 17 are subject to complex dimensioning during manufacturing. Furthermore, the spline cutting operation is complex and costly. Finally, this spline connection is a critical area for the turbomachine's service life.

[0011] The present document aims to remedy these drawbacks. Summary of the invention

[0012] The present document proposes a turbomachine assembly comprising a blower disk rotating about a longitudinal axis and a low-pressure shaft adapted to drive a low-pressure compressor rotor about the longitudinal axis, in which the blower disk comprises an external radially oriented shell configured to receive blower blades, an internal radially oriented shell configured to be fitted onto the low-pressure shaft and a hub connecting the internal radially oriented shell to the external radially oriented shell,

[0013] said radially internal ferrule comprising a centering portion and a gear portion, extending along the longitudinal axis,

[0014] said centering part is supported cylinder / cylinder against the low-pressure shaft to ensure the coaxiality of the blower disc and the compressor rotor, and

[0015] said gearing portion includes splines engaging with complementary splines provided on the low-pressure shaft, so as to block the relative rotation between the blower disc and the low-pressure shaft, and

[0016] in which the centering part has a longitudinal dimension greater than a longitudinal dimension of the gear part.

[0017] The dimensioning of the centering part makes it possible to simplify the assembly.

[0018] The centering part can extend upstream of the blower disc hub and the gearing part can extend downstream of the blower disc hub.

[0019] Alternatively, the centering part can extend downstream of the blower disc hub and the gearing part can extend upstream of the blower disc hub.

[0020] Alternatively, the centering part can extend downstream of the blower disc hub and the gearing part can extend upstream of the blower disc hub.

[0021] The longitudinal dimension of the centering part can be between 1.1 times and 4 times the longitudinal dimension of the gearing part.

[0022] The external diameter of the centering part can be equal to the external diameter of the gear part.

[0023] The assembly may include a clamping element suitable for mounting on the shaft low pressure upstream of the radially internal ferrule of the blower disc and come longitudinally against said radially internal ferrule of the blower disc to axially block the blower disc with respect to the low pressure shaft.

[0024] The assembly may include a guide bearing in which the low-pressure shaft is mounted. The radially internal ferrule of the blower disc may longitudinally abut against said guide bearing.

[0025] For example, the guide bearing may include an inner ring mounted tightly around the low-pressure shaft, said radially internal ferrule of the blower disc being abutted against the inner ring of the guide bearing.

[0026] The assembly may include sealing means, arranged downstream of the blower disc hub, comprising a sealing flange and a sealing cage. Said sealing flange may include a first end portion forming a dynamic seal with a corresponding portion of the radially internal shell of the blower disc and a second end portion forming a retainer of an elastically deformable portion of the sealing cage which is connected to an outer ring of the low-pressure shaft's rotational guide bearing.

[0027] The radially internal ferrule of the blower disc may include abradable licks arranged on its radially external surface.

[0028] The sealing flange can be arranged upstream of the sealing cage and the second end part of the sealing flange can be arranged radially outside the first end part of the sealing flange.

[0029] The upstream and downstream are defined according to the air circulation in the turbomachine.

[0030] The low pressure compressor can be arranged downstream of the blower.

[0031] The low pressure compressor rotor may comprise at least two stages of moving blades alternating with stages of stator blades.

[0032] This document also relates to a turbomachine comprising an assembly such as the one mentioned above. Brief description of the figures

[0033] [Fig-1] represents an upstream part of a turbomachine according to the prior art,

[0034] [Fig.2] represents a schematic view of an upstream part of a turbomachine according to this document. Detailed description of the invention

[0035] With reference to [Fig. 2], the upstream part of a turbomachine comprises a fan including blades mounted on a fan disk 102. The fan disk 102 includes a radially external shell 104 and a radially external shell. internal radial 106 connected by a disc hub 108. The turbomachine includes a low-pressure shaft 110 fitted into the internal radial shell 106 of the blower disc 102.

[0036] The turbomachine includes a nut 118 tightened on the low-pressure shaft 110 and abutted against the radially internal ferrule 106 of the blower disc 102. An internal ring 116 of a guide bearing 114 is further mounted around the low-pressure shaft 110.

[0037] The inner ring 116 is abutted upstream against the radially internal ferrule 106 and downstream against a shoulder 115 of the low pressure shaft 110.

[0038] To transmit the rotation of the compressor shaft from the blower to the rotor of the low-pressure compressor, the radially internal ferrule 106 includes a geared portion 122 comprising splines 124 engaging with complementary splines provided on the low-pressure shaft 110, so as to block the relative rotation between the blower disc 102 and the low-pressure shaft 110. The geared portion 122 is arranged downstream of the disc hub 108.

[0039] The radially internal ferrule 106 includes a centering part 120 comprising a radially internal cylindrical surface in cylindrical / cylindrical support against the radially external surface of the low pressure shaft 110.

[0040] Thus, a single centering is used to ensure coaxiality between the low-pressure shaft 110 and the blower disc 102, which simplifies production and allows a mass distribution that optimizes the footprint in the upstream part of the turbomachine.

[0041] In addition, the centering part 120 helps to reduce the risk of interference between the grooves of the radially internal ferrule 106 and the grooves of the low pressure shaft 110.

[0042] The centering part 120 has a longitudinal dimension strictly greater than the longitudinal dimension of the gear part 122. For example, the longitudinal dimension of the centering part 120 is at least 1.1 times greater than the longitudinal dimension of the gear part 122.

[0043] The turbomachine further includes a sealing flange 126 and a sealing cage 128. The sealing flange 126 includes a first end 125 arranged in contact with abradable smears 130 formed on the radially external surface of the gear part 122, so as to form a dynamic seal.

[0044] The sealing flange 126 includes a second end 127 bearing against an elastically deformable part 132 of the sealing cage 128.

[0045] The sealing cage 128 comprises a rigid annular portion 134 arranged around the guide bearing 116. This rigid portion 134 can form the outer ring of the guide bearing 116. Alternatively, the rigid portion 134 can be mounted around a outer ring of the guide bearing 116.

[0046] The sealing flange 126 is arranged upstream of the sealing cage 128. The second end 127 of the sealing flange 126 is arranged radially outside the first end 125 of the sealing flange 126, so that the sealing flange extends radially and longitudinally away from the radially internal ferrule 106.

[0047] The sealing cage 128 has a concavity facing towards the sealing flange 126.

[0048] The sealing flange 126 and the sealing cage 128 provide sealing upstream of the hub of the disc 108, sealing which serves to guarantee the proper functioning of the bearings under a pressurized air-oil mixture.

Claims

Demands

1. Turbomachine assembly comprising a blower disk (102) rotating about a longitudinal axis and a low-pressure shaft (110) capable of driving a low-pressure compressor rotor about the longitudinal axis, wherein the blower disk (102) comprises an external radial shell (104) configured to receive blower blades, an internal radial shell (106) configured to be fitted onto the low-pressure shaft (110), and a hub (108) connecting the internal radial shell (106) to the external radial shell (104), said internal radial shell (106) comprising a centering portion (120) and a gear portion (122) extending along the longitudinal axis, said centering portion (120) bearing cylinder-to-cylinder against the low-pressure shaft (110) to ensure the coaxiality of the disk. blower (102) and compressor rotor,and said gear portion (122) comprises splines engaging with complementary splines provided on the low-pressure shaft (110), so as to block the relative rotation between the blower disc (102) and the low-pressure shaft (110), and wherein the centering portion (120) has a longitudinal dimension greater than a longitudinal dimension of the gear portion (124).

2. Assembly according to claim 1, wherein the centering portion (120) extends upstream of the hub (108) of the blower disc and the gear portion (122) extends downstream of the hub (108) of the blower disc.

3. Assembly according to claim 1 or 2, wherein the longitudinal dimension of the centering part (120) is between 1.1 times and 4 times the longitudinal dimension of the gear part (122).

4. Assembly according to any one of the preceding claims, wherein the external diameter of the centering part (120) is equal to the external diameter of the gear part (122).

5. Assembly according to any one of the preceding claims, comprising a clamping member (118) adapted to be mounted on the low-pressure shaft (110) upstream of the radially internal ferrule (106) of the blower disc (102) and to longitudinally abut against said ferrule radially internal (106) of the blower disc to axially block the blower disc (102) relative to the low pressure shaft (110).

6. Assembly according to any one of the preceding claims, comprising a rotational guide bearing (114) in which the low-pressure shaft (110) is mounted, the radially internal ferrule (106) of the blower disc being longitudinally abutted against said rotational guide bearing.

7. Assembly according to any one of the preceding claims, comprising sealing means, arranged downstream of the hub (108) of the blower disc, comprising a sealing flange (126) and a sealing cage (128), said sealing flange comprising a first end portion (125) forming a dynamic seal with a corresponding portion (130) of the radially internal ferrule (106) of the blower disc and a second end portion (127) forming a retainer of an elastically deformable portion (132) of the sealing cage which is connected to an outer ring of the rotational guide bearing of the low pressure shaft.

8. Assembly according to the preceding claim, wherein the sealing flange (126) is arranged upstream of the sealing cage (128) and the second end part of the sealing flange (127) is arranged radially outside the first end part (125) of the sealing flange (126).

9. Turbomachine comprising an assembly according to one of the preceding claims.