Assembly of a turbine turbine fan

Abstract

This document relates to a turbomachine assembly comprising a blower disk (102) rotating about a longitudinal axis (X) and a low-pressure shaft (110) adapted to drive a low-pressure compressor rotor about the longitudinal axis, wherein the blower disk (102) comprises a ferrule (106) extending along the longitudinal axis and configured to be fitted onto the low-pressure shaft (110), wherein said ferrule comprises first coupling means (210) extending radially in projection, and an upstream portion of the low-pressure shaft comprises second coupling means (212) on its radially external surface cooperating with the first coupling means, said ferrule (106) comprising radially extending orifices through the first coupling means (210) and configured to receive screwing means (206) for said ferrule (106) to an upstream portion of the low-pressure shaft (110).Figure to be published with the abbreviation: [Fig. 2].

Description

Title of the invention: Assembly of a turbine fan for a bladed turbomachine 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 fan's rotation to the low-pressure compressor rotor.

[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 disk comprises a ferrule extending along the longitudinal axis and configured to be fitted onto the low-pressure shaft,

[0013] in which said ferrule comprises first coupling means extending radially in projection, and an upstream portion of the low-pressure shaft comprises second coupling means on its radially external surface cooperating with the first coupling means, said ferrule comprising radially extending orifices, and passing through the first coupling means, and configured to receive means for screwing said ferrule to an upstream portion of the low-pressure shaft.

[0014] The low-pressure shaft and the fan disc shell are bolted together, eliminating the need for splines to transmit the fan's rotation to the low-pressure compressor. This increases the turbomachine's service life. Furthermore, the bolted connection between the rotor disc and the low-pressure shaft simplifies the manufacturing and assembly process.

[0015] The first coupling means of the blower disc shell may include a first surface in contact with a corresponding second surface of the second coupling means of the low pressure shaft and the screwing means pass through said first surface and said second surface.

[0016] The upstream part of the low-pressure shaft may be hollow.

[0017] The second coupling means for the low-pressure shaft may include recesses configured to receive the first coupling means. These recesses may be formed on the radially external surface of the low-pressure shaft and extend radially and axially. For example, such recesses may have a shape complementary to that of the first coupling means.

[0018] The blower disk may include a radially external ferrule configured to receive blower blades, arranged radially outside the ferrule including the first coupling means and a hub connecting the ferrule including said first coupling means to the external radial ferrule.

[0019] The screwing means can be arranged downstream of said blower disc hub.

[0020] The blower disc hub may include at least one opening along the longitudinal axis configured for the passage of a clamping tool for the screwing means.

[0021] The first coupling means can be distributed circumferentially around the ferrule.

[0022] The ferrule may include radial recesses between two successive first coupling means. The radial recesses may be arranged on the radially internal surface of said ferrule.

[0023] The assembly may include sealing means, arranged downstream of the blower disc hub, comprising a sealing flange and a sealing cage.

[0024] The sealing flange may include a first end part forming a dynamic seal with a corresponding part of the ferrule comprising the first couplings of the blower disc and a second end part forming a retainer of an elastically deformable part of the sealing cage which is connected to an outer ring of a low-pressure shaft rotation guide bearing.

[0025] The ferrule comprising the first coupling points of the blower disc may include abradable slats on its radially external surface.

[0026] The upstream and downstream are defined according to the air circulation in the turbomachine.

[0027] The low pressure compressor can be arranged downstream of the blower.

[0028] This document relates to a turbomachine comprising an assembly as described above.

[0029] This document also relates to a method for assembling an assembly as described above, the method comprising:

[0030] - fit the ferrule around the upstream part of the low-pressure shaft by inserting the first coupling means into the second coupling means,

[0031] - insert screwing means into the orifices of the ferrule,

[0032] - insert a screw tool into the opening provided in the hub of the blower disc and screw in the said screwing means. 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.

[0035] [Fig.3] represents a schematic view of a section, perpendicular to the axis longitudinal of the turbomachine, of the fan disk ferrule of the [Fig.2]. Detailed description of the invention

[0036] With reference to Figures 2 and 3, the upstream part of a turbomachine with longitudinal axis X comprises a fan including blades mounted on a fan disk 102. The fan disk 102 comprises an external radial shell 104 and an internal radial shell 106 connected by a disk hub 108. The turbomachine includes a low-pressure shaft 110 fitted into the internal radial shell 106 of the fan disk 102.

[0037] The turbomachine further comprises a cone 204 arranged upstream of the blower disc 102 and the low-pressure shaft 110.

[0038] The low-pressure shaft 110 is further mounted in an inner ring 116 of a guide bearing 114.

[0039] 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.

[0040] The upstream portion of the low-pressure shaft 110 is hollow. The radially internal surface of the radially internal ferrule 106 comprises, for example, four projecting notches 210 extending radially along the longitudinal axis. The radially internal surface of the radially internal ferrule 106 comprises a radial recess 214 between each pair of successive notches 210. The radially external surface of the low-pressure shaft 110 includes grooves 212 having a shape complementary to that of the notches 210. The notches 210 are inserted into the grooves 212. The radially internal ferrule 106 is fixed to the low-pressure shaft 120 by screws 206 mounted in holes through said ferrule 106 and holes through the low-pressure shaft 110, at the level of the notches 210 and the grooves 212. The screws 206 are retained by nuts 207 which abut against the radially internal surface of the low-pressure shaft 110.The radially external surface of the ferrule 106 includes recesses 205 provided to receive the heads of the screws 206. The radially internal surface of the radially internal ferrule 106 may include more than four notches 210, for example 6 or 8 notches 210.

[0041] This bolted connection allows the rotation of the blower to be transmitted to the low-pressure compressor without splines. This increases the service life of the turbomachine and simplifies its manufacture.

[0042] The disc hub 108 includes one or more openings 202 passing through said disc hub 108 and configured to allow passage of a tightening tool 208 for the screws 206. The tightening tool 208 may be a torque wrench mounted in a suitable guide.

[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 includes a rigid annular part 134 arranged around the guide bearing 116. This rigid part 134 can form the outer ring of the guide bearing 116. Alternatively, the rigid part 134 can be mounted around an 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.

Claims

Demands

1. A turbomachine assembly comprising a blower disk (102) rotating about a longitudinal axis (X) and a low-pressure shaft (110) adapted to drive a low-pressure compressor rotor about the longitudinal axis, wherein the blower disk (102) comprises a ferrule (106) extending along the longitudinal axis and configured to be fitted onto the low-pressure shaft (110), wherein said ferrule comprises first coupling means (210) extending radially in projection, and an upstream portion of the low-pressure shaft comprises second coupling means (212) on its radially external surface cooperating with the first coupling means, said ferrule (106) comprising radially extending orifices, passing through the first coupling means (210), and configured to receive screwing means (206) for attaching said ferrule (106) to an upstream portion of the low pressure shaft (110).

2. Assembly according to claim 1, wherein the first coupling means of the blower disc shell comprise a first surface in contact with a corresponding second surface of the second coupling means of the low pressure shaft and the screwing means pass through said first surface and said second surface.

3. Assembly according to claim 1 or 2, wherein the upstream part of the low pressure shaft (110) is hollow.

4. Assembly according to any one of the preceding claims, wherein the second coupling means (212) of the low-pressure shaft (110) comprise recesses (214) configured to receive the first coupling means (210).

5. An assembly according to any one of the preceding claims, wherein the blower disc (102) comprises a radially external ferrule (104) configured to receive blower blades, arranged radially outside the ferrule (106) comprising the first coupling means (210) and a hub (108) connecting the ferrule (106) comprising said first coupling means (210) to the radially external ferrule (104), the screw means (206) being arranged downstream of said hub (108) of the blower disc, and said hub (108) comprising at least one opening (202) along the axis longitudinally configured for the passage of a clamping tool (208) of the screwing means (206).

6. Assembly according to any one of the preceding claims, wherein the first coupling means (210) are distributed circumferentially around the ferrule (106), said ferrule comprising radial recesses (214) between two successive first coupling means (210).

7. Assembly according to any one of the preceding claims, comprising sealing means, arranged downstream of the hub (104) 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 ferrule (106) comprising the first coupling means of the blower disc and a second end portion (127) forming a retainer of an elastically deformable portion of the sealing cage (128) which is connected to an outer ring of a rotating guide bearing (115) of the low pressure shaft (110).

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

9. Method of mounting an assembly according to any one of claims 1 to 7 and claim 5 comprising: - fitting the ferrule (106) around the upstream part of the low pressure shaft (110) by inserting the first coupling means (210) into the second coupling means (212), - inserting screwing means (206) into the orifices of the ferrule (106), - inserting a screwing tool (206) into the opening (202) provided in the hub (108) of the blower disc and screwing said screwing means (206).

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