Turbomachine accessory box assembly

Abstract

The present disclosure relates to an accessory housing of a turbomachine comprising an assembly (1) comprising: - a tubular shaft (2) intended to be driven in rotation about a longitudinal axis (X), - a pinion (3) coupled in rotation to the tubular shaft (2), and - at least one annular member (4) 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 (4) comprising an annular body housing an annular filter, the annular body comprising at least one inlet for the air / oil mixture (43), at least one oil outlet (44) opening radially outside the annular body and at least one filtered air outlet opening radially inside the tubular shaft (2), in which the assembly (1) comprises a bladed wheel (5) mounted inside the tubular shaft (2) and coupled in rotation to the tubular shaft (2). Abstract figure: Figure 5

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 a longitudinal axis 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 longitudinal axis 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] An assembly is proposed for an accessory housing of a turbomachine comprising a tubular shaft intended to be driven in rotation about a longitudinal axis, 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. Said at least one annular member comprises an annular body housing an annular filter. The annular body comprises at least one, in particular one or more, inlets for the air / oil mixture, at least one, in particular one or more, oil outlets opening radially outside the annular body and at least one, in particular one or more, filtered air outlets opening radially inside the tubular shaft.The assembly comprises at least one bladed wheel, and in particular one or more bladed wheels, each being mounted inside the tubular shaft and rotatably coupled to the tubular shaft.

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

[0017] The annular air / oil mixture separation member is in particular configured so that an air / oil mixture opens into each annular member through said at least one 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 said at least one corresponding oil outlet and the filtered air opens into the tubular shaft.

[0018] More specifically, the assembly may comprise air circulation means so that air circulation exists between said at least one air / oil mixture inlet of the annular body and the interior of the tubular shaft in operation.

[0019] The bladed wheel is notably configured to assist the circulation of filtered air inside the tubular shaft. The bladed wheel thus acts as a ventilation system. By "assisting the circulation of filtered air" is meant that the bladed wheel is configured: - to suck the filtered air from the annular member into the tubular shaft, when the bladed wheel is arranged downstream of the annular member relative to the direction of air circulation inside the tubular shaft; or - to discharge the filtered air coming from the annular member towards the inside of the tubular shaft, when the bladed wheel is arranged upstream of the annular member relative to the direction of air circulation inside the tubular shaft.

[0020] In other words, said at least one bladed wheel makes it possible to force the air / oil mixture to pass through the annular member for filtering the mixture. More precisely, the bladed wheel acts on the circulation of filtered air, for example in addition of a pressure difference between a pressure outside the annular member, corresponding in particular to a pressure inside the accessory box, and a pressure inside the tubular shaft, which may correspond to atmospheric pressure.

[0021] Such a bladed wheel therefore makes it possible to limit pressure losses and improve the performance of the turbomachine.

[0022] The features set out in the following paragraphs may, optionally, be implemented, independently of one another or in combination with one another:

[0023] The assembly may advantageously comprise an air inlet opening longitudinally inside the tubular shaft, the air inlet being arranged upstream of the pinion along the longitudinal axis.

[0024] Advantageously, each bladed wheel of said at least one bladed wheel is mounted on one side or the other of a median plane of the annular member. This positioning of the bladed wheel, at a distance from the median plane of the annular member, offers the advantage of being able to improve the impact of the rotation of the bladed wheel on the circulation of filtered air in the tubular shaft.

[0025] Each bladed wheel of said at least one bladed wheel advantageously comprises a hub and blades extending radially outward from the hub.

[0026] A radially external surface of the hub may have a cylindrical, convergent or divergent shape. Adapting the shape of the radially external surface of the hub advantageously makes it possible to influence the flow of filtered air inside the tubular shaft by improving the aerodynamics of the bladed wheel.

[0027] In particular, each bladed wheel of said at least one bladed wheel may comprise a radially external annular ferrule arranged radially outside the hub. The radially external annular ferrule is configured to be fixed against an internal surface of the tubular shaft, for example by shrink fitting. The use of a radially external annular ferrule advantageously makes it easier to mount the bladed wheel inside the tubular shaft.

[0028] Advantageously, a radially internal surface of the radially external annular shell has a cylindrical, convergent or divergent shape. Adapting the shape of the radially internal surface of the radially external annular shell advantageously makes it possible to influence the flow of filtered air inside the tubular shaft by improving the aerodynamics of the bladed wheel.

[0029] The blades may be curved in shape, in particular along the longitudinal axis.

[0030] Advantageously, a bladed wheel of said at least one bladed wheel is formed in one piece with the pinion.

[0031] Advantageously, the assembly comprises at least two, in particular two, annular members for separating the air / oil mixture. At least two annular members are understood to mean in particular that the annular filters of each of said at least two annular members are fluidically separated from each other. Implementing at least two distinct annular members for separating the air / oil mixture 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, this configuration 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 members for separating the air / oil mixture in the accessory housing.

[0032] 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 filter element of the plurality of filter elements.

[0033] The annular filter can in particular be made from a reticulated foam or from a porous material.

[0034] According to another aspect, there is provided an accessory box for a turbomachine, comprising an assembly as previously described.

[0035] The assembly as previously described is notably mounted inside the accessory box.

[0036] 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 mounted on one of the power outlets of the accessory housing.

[0037] 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.

[0038] According to another aspect, a turbomachine is provided comprising the accessory housing as previously described. Brief description of the drawings

[0039] Other characteristics, details and advantages will appear on reading the detailed description below, and on analyzing the attached drawings, in which: Fig.l

[0040] [Fig.l] schematically illustrates a sectional view of an example of a separation device according to the prior art. Fig. 2

[0041] [Fig.2] schematically illustrates a sectional view of another example of a separation device according to the prior art. Fig. 3

[0042] [Fig.3] schematically illustrates a sectional view of an assembly according to one embodiment. Fig. 4

[0043] [Fig.4] schematically illustrates a sectional view of an assembly according to one embodiment. Fig. 5

[0044] [Fig.5] schematically illustrates a sectional view of an assembly according to one embodiment. Fig. 6

[0045] [Fig.6] schematically illustrates a sectional view of an assembly according to one embodiment. Fig. 7

[0046] [Fig.7] schematically illustrates two views (figures 7A and 7B) of a bladed wheel of an assembly according to one embodiment. Description of the embodiments

[0047] Figures 3, 4, 5 and 6 show an assembly 1 for an accessory box of a turbomachine. The assembly is notably mounted inside the accessory box.

[0048] 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.

[0049] The assembly 1 comprises a tubular shaft 2, i.e. hollow, intended to be driven in rotation around a longitudinal axis X and a pinion 3 coupled in rotation to the tubular shaft 2. Tubular shaft is understood in particular to mean that the shaft is hollow, i.e. it comprises an internal tubular conduit 21 coaxial with the axis of the tubular shaft 2.

[0050] The terms longitudinal and radial are defined relative to the longitudinal axis X of the rotating tubular shaft.

[0051] 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.

[0052] The assembly 1 comprises at least one annular member 4 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 assembly 1 may, for example, comprise one, two, three or four annular members 4 for separating the air / oil mixture.

[0053] Each annular member 4 comprises an annular body 41, 41' housing an annular filter 42. When the assembly comprises more than two annular members, the annular filters of each of said at least two annular members are fluidically separated from each other.

[0054] Each annular body 41 comprises in particular a bottom wall extending radially and a radially external annular wall connected at a longitudinal end to a radially external end of the bottom wall.

[0055] The annular filter 42 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 42 may in particular be made of a reticulated foam or of a porous material.

[0056] The annular body 41 comprises at least one, in particular one or more, air / oil mixture inlets 43, each of which may be annular, at least one, in particular one or more, oil outlets 44, each of which may be annular, opening radially outside the annular body 41 and at least one, in particular one or more, filtered air outlets 45 opening radially inside the tubular shaft 2.

[0057] Said at least one air / oil mixture inlet 43 opens in particular longitudinally opposite the annular filter 42.

[0058] Said at least one air / oil mixture inlet may in particular be arranged at a longitudinal end of the annular body 4L Said at least one air / oil mixture inlet may in particular comprise an air / oil mixture inlet orifice extending annularly at a longitudinal end of the annular body 41 opposite the bottom wall of the annular body. Alternatively, said at least one air / oil mixture inlet may in particular comprise a plurality of air / oil mixture inlet orifices distributed circumferentially at a longitudinal end of the body annular 41.

[0059] Said at least one oil outlet comprises in particular a plurality of oil outlet orifices distributed circumferentially on the radially external wall of the annular body 41. 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 spaced longitudinally from one another.

[0060] Said at least one filtered air outlet is in particular arranged, at least partially, opposite one or more orifices 22 of the tubular shaft opening into the interior of the tubular shaft, in particular into the tubular conduit 21. Said at least one 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.

[0061] In particular, the annular air / oil mixture separation member is configured so that an air / oil mixture opens into the annular member through said at least one 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 said at least one corresponding oil outlet and the filtered air opens into the tubular shaft.

[0062] More specifically, the assembly may comprise air circulation means so that air circulation exists between said at least one inlet of the air / oil mixture of the annular body and the interior of the tubular shaft in operation. This air circulation may result from a pressure difference between a pressure outside the annular member, corresponding in particular to a pressure inside the accessory housing, and a pressure inside the tubular shaft, which may correspond to atmospheric pressure.

[0063] With reference to Figures 3 and 4, the assembly may comprise at least two annular members for separating the air / oil mixture. The implementation of at least two separate annular members for separating the air / oil mixture 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, this configuration 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 members for separating the air / oil mixture into the accessory housing.

[0064] With reference to [Fig. 3], the pinion 3 can be arranged longitudinally between at least two of said at least two annular members 4. This configuration makes it possible to provide a balanced mounting of the annular members on the tubular shaft on both sides. other side of gable 3.

[0065] At least one of said at least two annular members 4 may be structurally distinct from the other annular member(s) of said at least two annular members. In other words, the annular member 4 forms a unit structurally distinct from the other annular members. Thus producing structurally distinct annular member units makes it possible to modularize the means for separating the air / oil mixture, which facilitates their manufacture and assembly.

[0066] With reference to the assembly 1 illustrated in [Fig.4], at least two of said at least two annular members can be positioned on the same side of the pinion 3 along the longitudinal axis X.

[0067] The annular bodies 41 respectively of a pair of two annular members 4 of said at least two annular members can be structurally linked so as to form a single double annular body 41', as shown in [Fig.4].

[0068] More precisely, said at least one air / oil mixture inlet 43 of the annular body of an annular member of said pair is arranged at a first longitudinal end 46a of said same double annular body 41'. Said at least one air / oil mixture inlet of the annular body of the other annular member of said pair is arranged at a second longitudinal end 46b of said same double annular body opposite said first longitudinal end 46a.

[0069] In other words, the pair of two annular members makes it possible to receive an air / oil mixture at the inlet from two longitudinally opposite sides. This configuration advantageously makes it possible to improve the compactness of the assembly by implementing the same annular body housing two annular filters. In addition, this configuration facilitates the assembly by reducing the number of components to be mounted.

[0070] In particular, the assembly can be configured so that: a. the assembly 1 comprises only two annular members 4 structurally distinct from each other and positioned longitudinally respectively on either side of the pinion 3 (as illustrated in [Fig.3]); b. the assembly 1 comprises only a pair of two annular members 4 whose annular bodies are structurally linked so as to form a single double annular body 41' (as illustrated in [Fig.4]); c. the assembly 1 comprises only a first pair of two annular members whose annular bodies are structurally linked so as to form a single double annular body 41' and a second pair of two annular members whose annular bodies are structurally linked so as to form a single double annular body 41', the first pair of two annular members and said second pair of two annular members being positioned longitudinally respectively on either side other side of gable 3 (not shown); d. the assembly 1 comprises only a pair of two annular members whose annular bodies are structurally linked so as to form a single double annular body 41' and a third annular member structurally distinct from said pair of two annular members, said pair of two annular members and said third annular member being positioned longitudinally respectively on either side of the pinion 3 (not illustrated).

[0071] Any other arrangement of the assembly comprising several structurally distinct units of annular members, several pairs of annular members or a combination of structurally distinct units of annular members and pairs of annular members is also conceivable.

[0072] In an exemplary embodiment not shown, the pinion 3 can form the bottom wall of the annular body of at least one of said at least two annular members 4, in particular of two annular members positioned respectively on either side of the pinion 3 along the longitudinal axis. This configuration makes it possible to increase the compactness and integration of the assembly, and to reduce the mass of the assembly. The radial wall can thus be formed by the web of the pinion.

[0073] Furthermore, the tubular shaft 2 may advantageously comprise an axial stop 23, in particular an annular one, against which the annular body 41 of one of said at least two annular members is mounted. The assembly 1 may comprise a locking element 6 such as a nut / circlip which holds the corresponding annular body against the axial stop 23.

[0074] The assembly 1 may alternatively comprise an annular member for separating the air / oil mixture as illustrated in FIGS. 5 and 6.

[0075] Furthermore, with reference to figures 3, 4, 5 and 6, the assembly 1 comprises at least one, in particular one or more, bladed wheels 5, each being mounted inside the tubular shaft 2, more precisely in the tubular duct 21, and which is coupled in rotation to the tubular shaft 2. In operation, an axis of the bladed wheel merges in particular with the longitudinal axis X of the tubular shaft 2.

[0076] The bladed wheel is notably configured to assist the circulation of filtered air inside the tubular shaft 2. The bladed wheel thus acts as a ventilation system.

[0077] By "assisting the circulation of filtered air" is meant that the bladed wheel is configured: - to draw the filtered air from the annular member into the tubular shaft, when the bladed wheel is arranged downstream of the annular member relative to the direction of air circulation inside the tubular shaft; or - to discharge the filtered air coming from the annular member towards the inside of the tubular shaft, when the bladed wheel is arranged upstream of the annular member by relative to the direction of airflow inside the tubular shaft.

[0078] In other words, said at least one bladed wheel makes it possible to force the air / oil mixture to pass through the annular member for the filtration of the mixture. More precisely, the bladed wheel acts on the circulation of filtered air, for example in addition to a pressure difference between a pressure external to the annular member, corresponding in particular to a pressure inside the accessory housing, and a pressure inside the tubular shaft, which may correspond to atmospheric pressure, as explained previously.

[0079] Such a bladed wheel therefore makes it possible to limit pressure losses and improve the performance of the turbomachine.

[0080] In particular, the assembly 1 may comprise one bladed wheel, as illustrated in Figures 4, 5 and 6, two bladed wheels as illustrated in [Fig.3], or more than two bladed wheels (not illustrated).

[0081] The bladed wheel is preferably mounted on one side or the other of a median plane P of the annular member 4. This positioning of the bladed wheel, at a distance from the median plane of the annular member, offers the advantage of being able to improve the impact of the rotation of the bladed wheel on the circulation of filtered air in the tubular shaft.

[0082] The bladed wheel can in particular be formed in one piece with the pinion 3 (not illustrated).

[0083] Figures 7A and 7B illustrate two views of an example of a bladed wheel 5.

[0084] Each bladed wheel comprises in particular a hub 51 and blades 53 extending radially outwards from the hub 51.

[0085] The hub 51 can in particular form a hub of the bladed wheel.

[0086] The blades are in particular regularly distributed around the axis of the bladed wheel.

[0087] Each of the blades 53 is preferably substantially inclined.

[0088] The blades 53 may be curved in shape, in particular along the longitudinal axis X.

[0089] Furthermore, each bladed wheel may comprise a radially external annular ferrule 52 arranged radially outside the hub 51. The radially external annular ferrule 52 is configured to be fixed against an internal surface 24 of the tubular shaft 2, for example by shrink fitting. The use of a radially external annular ferrule advantageously makes it easier to mount the bladed wheel inside the tubular shaft.

[0090] Furthermore, a radially external surface 54 of the hub 51 preferably has a cylindrical, convergent or divergent shape. Adapting the shape of the radially external surface of the hub advantageously makes it possible to influence the flow of the filtered air inside the tubular shaft by improving the aerodynamics of the bladed wheel.

[0091] Similarly, a radially inner surface 55 of the annular ferrule ra- The radially external annular shell 52 may advantageously have a cylindrical, convergent or divergent shape. Adapting the shape of the radially internal surface of the radially external annular shell advantageously makes it possible to influence the flow of filtered air inside the tubular shaft by improving the aerodynamics of the bladed wheel.

[0092] Furthermore, with reference to [Fig.6], the assembly may advantageously comprise an air inlet 7 opening longitudinally inside the tubular shaft 2, the air inlet 7 being arranged upstream of the pinion 3 along the longitudinal axis X.

Claims

Claims

1. Accessory housing of a turbomachine, the accessory housing comprising an assembly (1) comprising: - a tubular shaft (2) intended to be driven in rotation about a longitudinal axis (X), - a pinion (3) coupled in rotation to the tubular shaft (2), and - at least one annular member (4) 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 (4) comprising an annular body (41, 41') housing an annular filter (42), the annular body (41, 41') comprising an inlet for the air / oil mixture (43), an oil outlet (44) opening radially outside the annular body (41) and a filtered air outlet (45) opening radially inside the tubular shaft (2), in which the assembly (1) comprises a bladed wheel (5) mounted inside the tubular shaft (2) and rotatably coupled to the tubular shaft (2).

2. An accessory housing according to claim 1, wherein the bladed wheel (5) is mounted on one side or the other of a median plane (P) of the annular member (4).

3. An accessory housing according to one of the preceding claims, wherein the bladed wheel (5) comprises a hub (51) and blades (53) extending radially outward from the hub (51).

4. Accessory housing according to the preceding claim, in which a radially external surface (54) of the hub (51) has a cylindrical, convergent or divergent shape.

5. Accessory housing according to one of claims 3 or 4, wherein the bladed wheel (5) comprises a radially external annular ferrule (52) arranged radially outside the hub (51), the radially external annular ferrule (52) being configured to be fixed against an internal surface (24) of the tubular shaft (2).

6. Accessory housing according to the preceding claim, in which a radially internal surface (55) of the radially external annular ferrule (52) has a cylindrical, convergent or divergent shape.

7. Accessory housing according to one of the preceding claims combined with claim 3, in which the blades (53) are of curved shape.

8. Accessory housing according to one of the preceding claims, in which the bladed wheel (5) is formed in one piece with the pinion (3).

9. Accessory box according to one of the preceding claims, comprising an air inlet (7) opening longitudinally inside the tubular shaft (2), the air inlet (7) being arranged upstream of the pinion (3) along the longitudinal axis (X).

10. Accessory housing according to one of the preceding claims, comprising two annular members (4) for separating the air / oil mixture.

11. Turbomachine comprising an accessory housing according to one of the preceding claims.

Images