Turbomachine accessory box assembly

Abstract

The present disclosure relates to an assembly (1) for an accessory housing of a turbomachine, the assembly (1) comprising: - a tubular shaft (2) comprising a first channel (21), - a pinion (3) coupled in rotation to the tubular shaft (2), and - at least one annular member (4a, 4b) for separating the air / oil mixture arranged around the tubular shaft (2) and integral in rotation with the tubular shaft (2), in which the assembly (1) comprises a device (5) for segregating the filtered air flows, the segregation device (5) being mounted radially inside the tubular shaft (2) and being mounted integral in rotation with the tubular shaft (2), the segregation device (5) comprising at least one second channel (51) extending axially and being arranged radially outside the first channel (21), said at least one second channel (51) being in fluid communication upstream with an outlet of filtered air (45b) from one of said at least one annular member (4a, 4b).Abstract figure: Figure 3.

Description

Title of the invention: Assembly for turbomachine accessory housing Technical field

[0001] The present disclosure relates to an assembly for an accessory housing for a turbomachine, and more particularly to an assembly capable of ensuring the separation of an air / oil mixture. Prior art

[0002] An accessory box constitutes equipment used to support and mechanically drive other equipment called accessories, such as electric generators, oil or fuel pumps, or others, necessary for the operation of the turbomachine or the aircraft on which the turbomachine is mounted. In order to ensure this drive, the required power is taken from a main shaft of the turbomachine, generally by means of a radial countershaft meshed with the main shaft, to mechanically transmit this power to the accessory box. The accessory box conventionally comprises a fixed casing, in which gears are housed for distributing the power to the various accessories.

[0003] The accessory box can also be associated with a device for separating an air / oil mixture, also called an oil separator. To do this, air is taken directly from the air stream of the turbomachine. This air then passes through the turbomachine, then is evacuated to the outside of the turbomachine to limit the pressure rise in other areas of the turbomachine. This air having passed through different areas of the turbomachine is loaded with oil used for cooling and lubricating the bearings and pinions of the rotating assemblies. To avoid the release of oil-laden air, mitigate the ecological impact of turbomachines, reduce oil consumption and limit the operations of filling the oil reserves, it is important to provide devices for separating the oil from the air before evacuating the air to the outside of the turbomachine.

[0004] It is known to produce the device for separating an air / oil mixture in an additional accessory outside the accessory housing. [Fig. 1] represents such a device comprising an air / oil mixture inlet 11, a casing 12 delimiting a first chamber 13 for receiving the air / oil mixture and a second chamber 14 for receiving the oil extracted from the air / oil mixture, a filtering element 15, an oil outlet 16 and a shaft 17 comprising a channel 18 for discharging the filtered air, the filtering element 15 being integral with the shaft 17.

[0005] The air and oil mixture is brought into the crankcase through inlet 11, then passes through the filtering element 15 where the oil is separated from the air and is extracted radially outwards by centrifugal effect, before opening into the second chamber 14 where it is discharged in the lower part through the outlet 16. The filtered air having passed through the filtering element 15 is directed towards the channel 18 of the shaft 17 before being discharged to the outside. The separation of the mixture by the filtering element 15 can in particular be carried out by rotating reticulated foams or a porous material.

[0006] This arrangement, although allowing a large flow of air / oil mixture to be processed, is bulky.

[0007] However, some recent engines require the accessory box to be implemented in a more restricted space of the turbomachine. The question of the compactness of the accessory box is more important in this case.

[0008] With the aim of improving the compactness of devices for separating an air / oil mixture, one solution provided is to integrate the separation device within the accessory box, as is known from document FR 3 064 305 in the name of the Applicant.

[0009] [Fig. 2] illustrates such a device arranged and driven by a mechanical power take-off at the accessory box. The device comprises an annular air / oil mixture inlet 11, a filter element 15, an oil outlet 16, a shaft 17 rotating with an axis of rotation X and a toothed pinion 19 carried by the shaft, the toothed pinion being meshed with another pinion of the accessory box to drive the shaft 17 in rotation. The tubular shaft 17 internally forms a channel 18 for discharging the filtered air. The terms axial and radial are defined relative to the axis of rotation X.

[0010] The mixture of air and oil is brought into the casing through the inlet 11, then passes through the filter element 15 where the oil is separated from the air and is extracted radially outwards by centrifugal effect, before being discharged. The filtered air having passed through the filter element 15 is directed towards the channel 18 of the shaft 17 before being discharged to the outside. The separation of the mixture by the filter element 15 can, in a similar manner, be carried out by the rotation of reticulated foams or a porous material.

[0011] However, such integration of the separation device into the accessory housing involves a reduction in the diameter of the filtration elements to be compatible with the external diameter of a toothed pinion. This results in greater pressure losses than in the external filtration configuration.

[0012] There is currently a need to recover as much energy as possible in order to improve the efficiency of the turbomachine.

[0013] The invention aims to propose a solution to this need, in a simple, inexpensive and reliable manner. Summary

[0014] The present disclosure improves the situation.

[0015] A set for an accessory box of a turbomachine is proposed. The assembly comprises a tubular shaft intended to be driven in rotation about an axis of rotation, a pinion coupled in rotation to the tubular shaft, and at least one annular member for separating the air / oil mixture arranged around the tubular shaft and integral in rotation with the tubular shaft. The tubular shaft comprises a first internal tubular channel coaxial with the tubular shaft. Said at least one annular member comprises an annular body housing an annular filter. Each annular body comprises an inlet for the air / oil mixture, an oil outlet opening radially outside the annular body and a filtered air outlet opening radially inside the annular body. The assembly comprises a device for segregating the filtered air flows, in particular for segregating the filtered air flows coming respectively from the first and second annular members.The segregation device is mounted radially inside the tubular shaft and is mounted to rotate with the tubular shaft. The segregation device comprises at least one second channel extending axially and being arranged radially outside the first channel. Said at least one second channel is in fluid communication upstream with the filtered air outlet of one of said at least one annular member. In particular, the filtered air outlet of the second annular member opens radially inside said at least one second channel.

[0016] The terms axial and radial are defined relative to the axis of rotation of the rotating tubular shaft.

[0017] The implementation of the filtered air flow segregation device makes it possible to further improve the performance of the filtering of the air / oil mixture by the annular members.

[0018] The assembly preferably comprises a first annular member and a second annular member for separating the air / oil mixture.

[0019] By two annular members, it is understood in particular that the annular filters of each of the two annular members are fluidically separated from each other.

[0020] Advantageously, the first annular member is arranged upstream of the second annular member in a direction of flow of filtered air in the first channel. The filtered air outlet of the first annular member opens radially into the first channel. Said at least one second channel is in fluid communication upstream with the filtered air outlet of the second annular member and downstream with the first channel.

[0021] In particular, the air filtered by the first annular member circulates only in the first channel and only the air filtered by the second annular member circulates in the second channel before joining the first channel further downstream.

[0022] More precisely, each of the annular air / oil mixture separation members is configured so that an air / oil mixture opens into each member annular through the corresponding air / oil mixture inlet, then is rotated in the annular member so that the oil contained in the air / oil mixture is centrifuged radially outside the annular member through the corresponding oil outlet and the filtered air opens radially inwards through the filtered air outlet. The filtered air from the first annular member opens radially directly into the first channel. The filtered air from the second annular member opens radially into said at least one second channel before opening axially further downstream into the first channel.

[0023] The present disclosure, by implementing two separate annular air / oil mixture separation members, makes it possible to provide at least two different paths for filtering the air / oil mixture. This configuration thus makes it possible to increase the air passage section and consequently to reduce the pressure losses of the assembly, and more generally of the turbomachine. In addition, the present disclosure makes it possible to increase the compactness of the means implemented for separating an air / oil mixture thanks to the compact integration of said at least two annular air / oil mixture separation members in the accessory housing.

[0024] In addition, the implementation of the filtered air flow segregation device makes it possible to further improve the performance of the filtering of the air / oil mixture by the two annular members. Indeed, carrying out a fluid separation of the filtered air exiting respectively from each of the annular members makes it possible to limit the impact of the suction of the air / oil mixture through the second annular member on the suction of the air / oil mixture through the first annular member. Consequently, such a configuration makes it possible to reduce the pressure losses of the assembly, and therefore of the accessory box.

[0025] Furthermore, the assembly may comprise air circulation means so that air circulation exists between the inlet of the air / oil mixture of the annular body and the interior of the tubular shaft in operation.

[0026] In particular, the second channel opens axially downstream, in particular from the second annular member, into the first channel. This configuration advantageously makes it possible to prevent the flow of filtered air in the second channel from disturbing the flow of filtered air in the first channel too much when these flows join.

[0027] The filtered air outlet of the first annular member and the second annular member may comprise a plurality of filtered air outlet orifices.

[0028] Advantageously, the segregation device is formed in one piece with the tubular shaft.

[0029] Alternatively, the segregation device may be a separate part of the tubular shaft intended to be mounted radially inside the tubular shaft. This ca This characteristic advantageously facilitates the implementation and maintenance of the segregation device.

[0030] Advantageously, the segregation device comprises a radially internal annular ferrule and a radially external annular ferrule which are coaxial and delimit the second channel between them. The radially internal annular ferrule forms in particular a wall radially delimiting the first channel and the second channel.

[0031] The segregation device comprises in particular a circumferential bottom wall connecting the radially external annular shell to the radially internal annular shell. The circumferential bottom wall is in particular arranged at an upstream axial end of the second channel. This wall closes the second channel at its upstream axial end.

[0032] The radially external annular ferrule may in particular be mounted against a wall of the first channel.

[0033] The radially external annular ferrule advantageously comprises at least one first opening radially opposite the filtered air outlet of the second annular member. The filtered air leaving the filtered air outlet of the second annular member can thus radially pass through said at least one first opening in order to open radially into the second channel.

[0034] The radially outer annular ferrule may in particular comprise a plurality of first openings. A number of first openings is preferably equal to a number of filtered air outlet orifices of the second annular member.

[0035] Advantageously, the segregation device comprises a plurality of second channels distributed circumferentially, preferably regularly, around the axis of rotation. The number of second channels is preferably equal to the number of filtered air outlet orifices of the second annular member. For example, the segregation device may comprise between 6 and 10 second channels.

[0036] The segregation device may in particular comprise first radial walls extending axially and radially between the radially inner annular shell and the radially outer annular shell and circumferentially delimiting the second channels from each other. The implementation of the first radial walls makes it possible in particular, on the one hand, to improve the mechanical strength of the segregation device, and on the other hand, to guide the flow axially in the second channels.

[0037] Advantageously, the radially outer annular ferrule extends axially upstream beyond the filtered air outlet of the first annular member. The radially outer annular ferrule comprises at least one second opening radially opposite the filtered air outlet of the first annular member. The filtered air leaving the filtered air outlet of the first annular member can thus radially pass through said at least one second opening in order to open radially into the first channel. This configuration of the radially external annular ferrule makes it possible to improve the retention of the segregation device in the tubular shaft.

[0038] The radially outer annular ferrule may in particular comprise a plurality of second openings. A number of second openings is preferably equal to a number of filtered air outlet orifices of the first annular member.

[0039] The segregation device may comprise radial guide fins extending axially and radially inward from the radially outer annular shell, at the periphery of the second openings. The implementation of the radial guide fins makes it possible in particular, on the one hand, to improve the mechanical strength of the segregation device, and on the other hand, to radially guide the flow of filtered air towards the first channel.

[0040] The radial guide fins may in particular be connected to the circumferential bottom wall of the segregation device.

[0041] Each of the radial guide fins may comprise a radially inner end opposite the radially outer annular ferrule. The radially inner end of the radial guide fins is free. The radially inner end of the radial guide fins is advantageously arranged substantially at the same radial position as the radially inner annular ferrule. This arrangement makes it possible to guide the filtered air leaving the first annular member radially, initially, to the level of the radially inner annular ferrule, then axially towards the inside of the radially inner annular ferrule.

[0042] Advantageously, the pinion is arranged axially between the first annular member and the second annular member. This configuration makes it possible to provide balanced mounting of the annular members on the tubular shaft on either side of the pinion.

[0043] The annular filter may include a plurality of filter elements and the annular body may form a plurality of housings circumferentially side by side and separated by radial walls of the annular body, each housing of the plurality of housings housing one of the plurality of filter elements.

[0044] The annular filter can in particular be made from a reticulated foam or from a porous material.

[0045] According to another aspect, there is provided an accessory box for a turbomachine, comprising an assembly as previously described. The assembly as previously described is in particular mounted inside the accessory box.

[0046] Advantageously, the accessory housing comprises a casing housing a plurality of power outlets capable of being driven by a shaft of the turbomachine and capable of rotating at least one accessory equipment. Each power outlet comprises in particular a shaft and at least one pinion coupled in rotation to the shaft. The assembly is in particular arranged at one of the power outlets of the accessory box.

[0047] The accessory box may comprise a plurality of assemblies as previously described, each of the assemblies being mounted to a separate power outlet of the accessory box.

[0048] According to another aspect, a turbomachine is provided comprising the accessory housing as previously described. Brief description of the drawings

[0049] Other characteristics, details and advantages will appear on reading the detailed description below, and on analyzing the attached drawings, in which: Fig.l

[0050] [Fig.l] schematically illustrates a sectional view of an example of a separation device according to the prior art. Fig. 2

[0051] [Fig.2] schematically illustrates a sectional view of another example of a separation device according to the prior art. Fig. 3

[0052] [Fig.3] schematically illustrates a sectional view of an assembly according to one embodiment. Fig. 4

[0053] [Fig.4] schematically illustrates two views (figures 4A and 4B) of an assembly according to one embodiment. Fig. 5

[0054] [Fig.5] schematically illustrates a view of a segregation device according to one embodiment. Description of the embodiments

[0055] Figures 3, 4 and 5 represent, at least partially, an assembly 1 for an accessory box of a turbomachine. The assembly is notably mounted inside the accessory box.

[0056] The accessory housing conventionally comprises a casing housing a plurality of power outlets capable of being driven by a shaft of the turbomachine and capable of rotating at least one accessory equipment. Each power outlet comprises in particular a shaft and at least one pinion coupled in rotation to the shaft. The assembly according to the present disclosure is in particular mounted to one of the power outlets of the accessory housing. The accessory housing may comprise a plurality of assemblies, each of the assemblies being mounted to a separate power outlet of the accessory housing.

[0057] The assembly 1 comprises a tubular shaft 2 intended to be driven in rotation around of an axis of rotation X and a pinion 3 coupled in rotation to the tubular shaft 2. The tubular shaft comprises a first internal tubular channel 21 coaxial with the tubular shaft 2.

[0058] The terms axial and radial are defined relative to the axis of rotation X of the rotating tubular shaft.

[0059] More particularly, the pinion 3 comprises an annular web 31 carrying at its radially external end a toothing intended to be coupled in rotation with a corresponding toothing of another pinion.

[0060] The assembly 1 comprises at least one, preferably a first 4a and a second 4b annular members for separating the air / oil mixture arranged around the tubular shaft 2 and integral in rotation with the tubular shaft 2. The annular member for separating the air / oil mixture is also referred to as an oil separator. The first annular member 4a is in particular arranged upstream of the second annular member 4b in a direction of flow of filtered air in the first channel 21.

[0061] The present disclosure, by implementing two separate annular air / oil mixture separation members, makes it possible to provide at least two different paths for filtering the air / oil mixture. This configuration thus makes it possible to increase the air passage section and consequently to reduce the pressure losses of the assembly, and more generally of the turbomachine. In addition, the present disclosure makes it possible to increase the compactness of the means implemented for separating an air / oil mixture thanks to the compact integration of said at least two annular air / oil mixture separation members in the accessory housing.

[0062] As illustrated in [Fig. 3], the pinion 3 can be arranged axially between the first annular member 4a and the second annular member 4b. This configuration makes it possible to provide a balanced mounting of the annular members on the tubular shaft on either side of the pinion.

[0063] Each annular member 4a, 4b comprises an annular body 41a, 41b housing an annular filter 42a, 42b. By two annular members, it is understood in particular that the annular filters of each of the two annular members are fluidically separated from each other.

[0064] Each annular body 41a, 41b comprises in particular a bottom wall extending radially and a radially outer annular wall connected at an axial end to a radially outer end of the bottom wall.

[0065] The annular filter 42a, 42b may comprise a plurality of filter elements and the annular body may form a plurality of housings circumferentially side by side and separated by radial walls of the annular body, each housing of the plurality of housings housing a filter element of the plurality of filter elements. The annular filter 42a, 42b may in particular be made of a reticulated foam or in a porous material.

[0066] Each annular body 41a, 41b comprises an air / oil mixture inlet 43a, 43b, an oil outlet 44a, 44b opening radially outside the annular body 41a, 41b and a filtered air outlet 45a, 45b opening radially inside the annular body.

[0067] The air / oil mixture inlet 43a, 43b opens in particular axially opposite the annular filter 42a, 42b. The air / oil mixture inlet 43a, 43b may in particular be arranged at an axial end of the annular body 41a, 41b.

[0068] The air / oil mixture inlet 43a, 43b may comprise one or more air / oil mixture inlet orifices, each of which may be annular. The air / oil mixture inlet may in particular comprise a single air / oil mixture inlet orifice extending annularly at an axial end of the annular body 41a, 41b opposite the bottom wall of the annular body. Alternatively, the air / oil mixture inlet may in particular comprise a plurality of air / oil mixture inlet orifices distributed circumferentially at an axial end of the annular body 41a, 41b.

[0069] The oil outlet 44a, 44b may comprise one or more oil outlet orifices, each of which may be annular. The oil outlet orifices are in particular distributed circumferentially on the radially outer wall of the annular body 41a, 41b. The oil outlet orifices may in particular form one or more annular rows of oil outlet orifices, each of the annular rows of oil outlet orifices being axially spaced from one another.

[0070] The filtered air outlet 45a, 45b may comprise one or more filtered air outlet orifices, each of which may be annular. The filtered air outlet is in particular arranged, at least partially, opposite one or more orifices 22a, 22b of the tubular shaft. The filtered air outlet may in particular form a filtered air outlet orifice extending annularly opposite said one or more orifices 22 of the tubular shaft when the filtered air outlet comprises a single filtered air outlet orifice. Alternatively, when the filtered air outlet comprises several filtered air outlet orifices, the filtered air outlet orifices may form one or more annular rows of filtered air outlet orifices, each of the annular rows of filtered air outlet orifices being axially spaced from one another.

[0071] In particular, each of the annular air / oil mixture separation members is configured so that an air / oil mixture opens into each annular member through the corresponding air / oil mixture inlet, then is rotated in the annular member so that the oil contained in the air / oil mixture is centrifuged radially outside the annular member through the corresponding oil outlet and the filtered air opens radially inwards through the filtered air outlet.

[0072] Furthermore, the assembly may comprise air circulation means so that air circulation exists between the inlet of the air / oil mixture of the annular body and the interior of the tubular shaft in operation.

[0073] Furthermore, with reference to FIGS. 3, 4A, 4B and 5, the filtered air outlet 45a of the first annular member 4a opens in particular radially into the first channel 21.

[0074] The assembly 1 comprises a device 5 for segregating the filtered air flows, in particular for segregating the filtered air flows coming respectively from the first and second annular members. The segregation device is mounted radially inside the tubular shaft 2 and is mounted so as to rotate with the tubular shaft 2. The segregation device 5 comprises at least one second channel 51 extending axially and being arranged radially outside the first channel 21. Said at least one second channel 51 is in fluid communication upstream with the filtered air outlet 45b of one of said at least one annular member, in particular of the second annular member 4b and in particular downstream with the first channel 21. In particular, the filtered air outlet 45b of the second annular member 4b opens radially inside said at least one second channel 51.

[0075] The second channel 51 is in particular delimited axially by a closed upstream axial end 52 and by a downstream axial end 53 opening onto the first channel 21.

[0076] In particular, the second channel 51 advantageously opens axially downstream, in particular from the second annular member, into the first channel 21.

[0077] The present disclosure, by implementing two separate annular air / oil mixture separation members, makes it possible to provide at least two different paths for filtering the air / oil mixture. This configuration thus makes it possible to increase the air passage section and consequently to reduce the pressure losses of the assembly, and more generally of the turbomachine. In addition, the present disclosure makes it possible to increase the compactness of the means implemented for separating an air / oil mixture thanks to the compact integration of said at least two annular air / oil mixture separation members in the accessory housing.

[0078] In addition, the implementation of the filtered air flow segregation device makes it possible to further improve the performance of the filtering of the air / oil mixture by the two annular members. Indeed, carrying out a fluid separation of the filtered air exiting respectively from each of the annular members makes it possible to limit the impact of the suction of the air / oil mixture through the second annular member on the suction of the air / oil mixture through the first annular member. Consequently, such a configuration makes it possible to reduce the pressure losses of the assembly.

[0079] Advantageously, the segregation device 5 is formed in a single piece with the tubular shaft.

[0080] Alternatively, the segregation device 5 may be a separate part of the tubular shaft 2 intended to be mounted radially inside the tubular shaft 2. This characteristic advantageously makes it easier to implement and maintain the segregation device.

[0081] More precisely, the segregation device 5 comprises a radially internal annular ferrule 54 and a radially external annular ferrule 55 which are coaxial and delimit between them the second channel 51. The radially internal annular ferrule forms in particular a wall radially delimiting the first channel and the second channel. The radially external annular ferrule 55 may in particular be mounted against a wall 24 of the first channel 21.

[0082] The segregation device 5 comprises in particular a circumferential bottom wall 60 connecting the radially external annular ferrule 55 to the radially internal annular ferrule 54. The circumferential bottom wall 60 is in particular arranged at the upstream axial end 52 of the second channel. This wall closes the second channel at its upstream axial end. The circumferential bottom wall 60 may in particular comprise, at its upstream end, a surface inclined from upstream to downstream, so as to facilitate the flow of air filtered by the first annular member 4a.

[0083] The radially external annular ferrule 54 advantageously comprises at least one first opening 56 radially opposite the filtered air outlet 45b of the second annular member 4b. The filtered air leaving the filtered air outlet of the second annular member can thus radially pass through said at least one first opening in order to open radially into the second channel.

[0084] The radially external annular ferrule 55 may in particular comprise a plurality of first openings 56. A number of first openings is preferably equal to a number of filtered air outlet orifices of the second annular member 4b.

[0085] Furthermore, the segregation device may in particular comprise a plurality of second channels 51 distributed circumferentially, preferably regularly, around the axis of rotation X. The number of second channels 51 is preferably equal to the number of filtered air outlet orifices of the second annular member 4b. For example, the segregation device may comprise between 6 and 10 second channels.

[0086] The segregation device may in particular comprise first radial walls 58 extending axially and radially between the radially inner annular ferrule 54 and the radially outer annular ferrule 55 and circumferentially delimiting the second channels 51 from each other. The implementation of the first radial walls 58 makes it possible in particular, on the one hand, to improve the mechanical strength of the segregation device, and on the other hand, to guide the flow axially in the second channels.

[0087] Advantageously, the radially external annular ferrule 55 extends axially upstream beyond the filtered air outlet 45a of the first annular member 4a. The radially external annular ferrule 55 comprises in particular at least one second opening 57 radially opposite the filtered air outlet 45a of the first annular member 4a. The filtered air leaving the filtered air outlet of the first annular member can thus radially pass through said at least one second opening in order to open radially into the first channel. This configuration of the radially external annular ferrule makes it possible to improve the retention of the segregation device in the tubular shaft.

[0088] The radially external annular ferrule 55 may in particular comprise a plurality of second openings 57. A number of second openings 57 is preferably equal to a number of filtered air outlet orifices 45a of the first annular member 4a.

[0089] The segregation device 5 may comprise radial guide fins 59 extending axially and radially inwards from the radially external annular shell 55, at the periphery of the second openings 57. The implementation of the radial guide fins 59 makes it possible in particular, on the one hand, to improve the mechanical strength of the segregation device, and on the other hand, to radially guide the flow of filtered air towards the first channel.

[0090] The radial guide fins 59 may in particular be connected to the circumferential bottom wall 60 of the segregation device.

[0091] Each of the radial guide fins 59 may comprise a radially inner end opposite the radially outer annular ferrule 55. The radially inner end of the radial guide fins 59 is free.

[0092] The radially inner end of the radial guide fins 59 is advantageously arranged substantially at the same radial position as the radially inner annular ferrule 54. This arrangement makes it possible to guide the filtered air leaving the first annular member radially, initially, to the level of the radially inner annular ferrule 54, then axially towards the inside of the radially inner annular ferrule.

Claims

Claims

1. Assembly (1) for an accessory housing of a turbomachine, the assembly (1) comprising: - a tubular shaft (2) intended to be driven in rotation about an axis of rotation (X) and comprising a first internal tubular channel (21) coaxial with the tubular shaft (2), - a pinion (3) coupled in rotation to the tubular shaft (2), and - at least one annular member (4a, 4b) for separating the air / oil mixture arranged around the tubular shaft (2) and integral in rotation with the tubular shaft (2), said at least one annular member (4a, 4b) comprising an annular body (41a, 41b) housing an annular filter (42a, 42b), each annular body (41a, 41b) comprising an air / oil mixture inlet (43a, 43b), an oil outlet (44a, 44b) opening radially to the exterior of the annular body (41a, 41b) and a filtered air outlet (45a, 45b) opening radially inside the annular body (41a, 41b),wherein the assembly (1) comprises a device (5) for segregating the filtered air flows, the segregation device (5) being mounted radially inside the tubular shaft (2) and being mounted so as to rotate with the tubular shaft (2), the segregation device (5) comprising at least one second channel (51) extending axially and being arranged radially outside the first channel (21), said at least one second channel (51) being in fluid communication upstream with the filtered air outlet (45b) of one of said at least one annular member (4a, 4b).,

2. Assembly (1) according to claim 1, comprising a first annular member (4a) and a second annular member (4b) for separating the air / oil mixture.

3. Assembly (1) according to claim 2, in which the first annular member (4a) is arranged upstream of the second annular member (4b) in a direction of flow of filtered air in the first channel (21), the filtered air outlet (45a) of the first annular member (4a) opening radially into the first channel (21), said at least one second channel (51) being in fluid communication upstream with the filtered air outlet (45b) of the second annular member (4b) and downstream with the first channel (21).

4. Assembly (1) according to one of the preceding claims combined with the claim 2, wherein the second channel (51) opens axially downstream of the second annular member (4b) into the first channel (21).

5. Assembly (1) according to one of the preceding claims, in which the segregation device (5) comprises a radially internal annular ferrule (54) and a radially external annular ferrule (55) coaxial and delimiting between them the second channel (51), the radially external annular ferrule (54) comprising at least a first opening (56) radially opposite the filtered air outlet (45b) of the second annular member (4b).

6. Assembly (1) according to claim 5 combined with claim 2, in which the radially external annular ferrule (55) extends axially upstream beyond the filtered air outlet (45a) of the first annular member (4a), the radially external annular ferrule (55) comprising at least one second opening (57) radially opposite the filtered air outlet (45a) of the first annular member (4a).

7. Assembly (1) according to one of the preceding claims, in which the segregation device (5) comprises a plurality of second channels (51) distributed circumferentially, preferably regularly, around the axis of rotation (X).

8. Assembly (1) according to claim 7 combined with claim 2, wherein the filtered air outlet (45b) of the second annular member (4b) comprises a plurality of filtered air outlet orifices, the number of second channels (51) being equal to the number of filtered air outlet orifices of the second annular member (4b).

9. Assembly (1) according to one of the preceding claims, in which the segregation device (5) is formed in one piece with the tubular shaft (2).

10. Assembly (1) according to one of claims 1 to 8, in which the segregation device (5) is a part separate from the tubular shaft (2) intended to be mounted radially inside the tubular shaft (2).

11. Assembly (1) according to one of the preceding claims combined with claim 2, in which the pinion (3) is arranged axially between the first annular member (4a) and the second annular member (4b).

12. Accessory housing for a turbomachine comprising an assembly (1) according to one of the preceding claims.

13. Turbomachine comprising an accessory housing according to claim previous instruction.

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