Assembly for a turbine accessory gearbox

Abstract

This disclosure relates to an assembly (1) for a turbine accessory gearbox, the assembly (1) comprising: - a tubular shaft (2) including a first channel (21), - a gear (3) rotatably coupled to the tubular shaft (2), and - at least one annular member (4a, 4b) arranged around the tubular shaft (2) and rotatably integral with the tubular shaft (2) to separate an air / oil mixture, wherein the assembly (1) includes an isolation device (5) for filtering airflow, the isolation device (5) being mounted radially inside the tubular shaft (2) and rotatably integral with the tubular shaft (2), the isolation device (5) including at least one axially extending second channel (51) arranged radially outside the first channel (21), the at least one second channel (51) being in fluid communication upstream with a filtered air outlet (45b) of one of the at least one annular member (4a, 4b).

Description

Technical Field

[0001] This disclosure relates to components for turbine accessory gearboxes, and more specifically to components capable of separating air / oil mixtures. Background Technology

[0002] An accessory gearbox is a component used to support and mechanically drive other components known as accessories, such as generators, oil pumps, or fuel pumps, which are essential for the operation of turbines or turbine-equipped aircraft. To provide this drive, the required power is obtained from the turbine's main shaft, typically via a radial drive shaft meshing with the main shaft to mechanically transmit this power to the accessory gearbox. The accessory gearbox generally comprises a fixed housing containing gears for distributing power to the various accessories.

[0003] The accessory gearbox can also be associated with a device for separating the air / oil mixture, also known as an oil separator. For this purpose, air is drawn directly from the turbine's airflow. This air then passes through the turbine and is exhausted from the outside of the device to limit pressure buildup in other areas of the turbine. Since the air has passed through various parts of the turbine, it carries oil used for cooling and lubricating the bearings and gears of the rotating components. To prevent the emission of oil-laden air, mitigate the turbine's environmental impact, reduce oil consumption, and limit the need to replenish oil reservoirs, it is important to provide a device capable of separating the oil from the air before it is exhausted from the turbine.

[0004] It is known that an air / oil mixture separator is implemented in an additional accessory outside the accessory gearbox. Figure 1 An apparatus is shown that includes an air / oil mixture inlet 11, a housing 12 (which defines a first chamber 13 for receiving the air / oil mixture and a second chamber 14 for receiving oil extracted from the air / oil mixture), a filter element 15, an oil outlet 16, and a shaft 17 (which includes a channel 18 for discharging filtered air), the filter element 15 being integral with the shaft 17.

[0005] The air-oil mixture is fed into the housing via inlet 11 and then passes through filter element 15, where the oil is separated from the air and extracted radially outward by centrifugal force. It then enters the second chamber 14, where the oil is discharged at the bottom via outlet 16. The filtered air, having passed through filter element 15, is guided to channel 18 of shaft 17 and then discharged to the outside. Separation of the mixture by filter element 15 can be achieved, in particular, by rotating cross-linked foam or porous materials.

[0006] While this arrangement allows for the handling of large quantities of air / oil mixtures, it is also bulky.

[0007] However, some recent engines require the accessory gearbox to be installed in a more confined space inside the turbine. In this case, the compactness of the accessory gearbox becomes even more critical.

[0008] To improve the compactness of the air / oil mixture separator, one solution is to integrate the separator into an accessory gearbox, as disclosed by the applicant in French Patent No. 3 064 305.

[0009] Figure 2 An apparatus is shown, arranged and driven by a mechanical power output device of an accessory gearbox. The apparatus includes an annular inlet 11 for an air / oil mixture, a filter element 15, an oil outlet 16, a rotating shaft 17 having a rotation axis X, and a toothed gear 19 mounted on the shaft, which meshes with another gear in the accessory gearbox to drive the shaft 17 to rotate. The tubular shaft 17 forms an internal passage 18 for discharging filtered air. The terms "axial" and "radial" are defined relative to the rotation axis X.

[0010] The mixture of air and oil is fed into the housing via inlet 11, then passes through filter element 15, where the oil and air are separated and extracted radially outward by centrifugal force before being discharged. The filtered air, having passed through filter element 15, is guided to channel 18 of shaft 17 and then discharged to the outside. The separation of the mixture by filter element 15 can also be achieved, in particular, by rotating cross-linked foam or porous material.

[0011] However, integrating the separator into the accessory gearbox in this way requires reducing the diameter of the filter element to ensure compatibility with the outer diameter of the toothed gear. This results in a larger pressure drop than with an external filtration configuration.

[0012] Currently, there is a need to recover as much energy as possible to improve turbine efficiency.

[0013] This invention aims to meet this need in a simple, economical and reliable manner. Summary of the Invention

[0014] This disclosure improves upon the prior art.

[0015] An assembly for a turbine accessory gearbox is proposed. The assembly includes a tubular shaft intended to be driven to rotate about a rotational axis, a gear rotatably coupled to the tubular shaft, and at least one air / oil mixture separating annular member arranged around and rotatably integral with the tubular shaft. The tubular shaft includes a first internal tubular channel coaxial with the tubular shaft. The at least one annular member includes an annular body housing an annular filter. Each annular body includes an air / oil mixture inlet, an oil outlet radially outward to the outside of the annular body, and a filtered air outlet radially inward to the interior of the annular body. The assembly includes an isolation device for the filtered airflow, particularly for isolating filtered airflow originating from the first and second annular members, respectively. The isolation device is mounted radially inside the tubular shaft and is rotatably integral with the tubular shaft. The isolation device includes at least one axially extending second channel arranged radially outside the first channel. The at least one second channel is in fluid communication upstream with the filtered air outlet of one of the at least one annular members. Specifically, the filtered air outlet of the second annular member radially opens into the interior of the at least one second channel.

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

[0017] The implementation of an airflow isolation device further improves the filtration performance of the annular component for air / oil mixtures.

[0018] The component preferably includes a first annular member and a second annular member for separating air / oil mixtures.

[0019] The "two annular components" specifically refer to the fact that the annular filters of each of the two annular components are separated from each other in terms of fluid flow.

[0020] Advantageously, the first annular member is arranged upstream of the second annular member in the direction in which the filtered air flows through the first channel. The filtered air outlet of the first annular member opens radially into the first channel. 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] Specifically, the air filtered by the first annular member flows only through the first channel, and the air filtered by the second annular member flows only through the second channel, before further converging into the first channel downstream.

[0022] More specifically, each air / oil mixture separating annular member is configured such that the air / oil mixture enters each annular member via a corresponding air / oil mixture inlet, and then rotates within the annular member, causing the oil contained in the air / oil mixture to be centrifugally separated radially outward from the annular member through a corresponding oil outlet, while the filtered air flows radially inward through the filtered air outlet. Filtered air from the first annular member flows radially directly into the first channel. Filtered air from the second annular member flows radially into the at least one second channel, and then further axially downstream into the first channel.

[0023] This disclosure provides at least two distinct air / oil mixture filtration paths by employing two separate air / oil mixture separation annular members. This configuration increases the airflow cross-section, thereby reducing the pressure drop across the assembly and, more broadly, the turbine. Furthermore, this disclosure improves the compactness of the device for separating the air / oil mixture by compactly integrating the at least two air / oil mixture separation annular members into an accessory gearbox.

[0024] Furthermore, the implementation of the airflow isolation device further improves the filtration performance of the annular components for the air / oil mixture. In fact, fluid separation of the filtered air discharged from each annular component allows for limiting the impact of the suction of the air / oil mixture through the second annular component on the suction of the air / oil mixture through the first annular component. Therefore, this configuration enables a reduction in the pressure drop of the components, thereby reducing the pressure drop of the accessory gearbox.

[0025] In addition, the component may include an air circulation device that allows air circulation between the air / oil mixture inlet of the annular body and the interior of the tubular shaft during operation.

[0026] Specifically, the second channel opens axially downstream, particularly downstream of the second annular member, and enters the first channel. This configuration effectively prevents the filtered airflow in the second channel from unduly interfering with the filtered airflow in the first channel when merging with these flows.

[0027] The filtered air outlets of the first and second annular components may include multiple filtered air outlet orifices.

[0028] Advantageously, the isolation device is integrally formed with the tubular shaft.

[0029] Alternatively, the isolation device can be a component separate from the tubular shaft, designed to be installed radially inside the tubular shaft. This feature advantageously facilitates the installation and maintenance of the isolation device.

[0030] Advantageously, the isolation device includes a radially inner annular ring and a radially outer annular ring, which are coaxial and define a second channel between them. The radially inner annular ring specifically forms a wall that radially defines the first and second channels.

[0031] The isolation device specifically includes a circumferential bottom wall that connects a radially outer annular ring to a radially inner annular ring. The circumferential bottom wall is specifically positioned at the upstream axial end of the second channel. This wall closes the upstream axial end of the second channel.

[0032] The radial outer annular ring can be specifically mounted against the wall of the first channel.

[0033] The radially outer annular ring advantageously includes at least one first opening that radially faces the filtered air outlet of the second annular member. Therefore, filtered air exiting the filtered air outlet of the second annular member can radially pass through the at least one first opening to radially discharge into the second channel.

[0034] The radial outer annular ring may specifically include a plurality of first openings. The number of first openings is preferably equal to the number of filter air outlet orifices of the second annular member.

[0035] Advantageously, the isolation device includes a plurality of second channels circumferentially distributed, preferably at regular intervals, 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 isolation device may include 6 to 10 second channels.

[0036] The isolation device may specifically include first radial walls that extend axially and radially between the radially inner annular ring and the radially outer annular ring, and circumferentially separate the second channels from each other. The use of the first radial walls makes it possible, in particular, to improve the mechanical strength of the isolation device on the one hand, and to guide axial flow within the second channels on the other hand.

[0037] Advantageously, the radially outer annular ring extends axially upstream beyond the filtered air outlet of the first annular member. The radially outer annular ring includes at least one second opening that radially faces the filtered air outlet of the first annular member. Therefore, filtered air exiting the filtered air outlet of the first annular member can radially pass through the at least one second opening to radially discharge into the first channel. This configuration of the radially outer annular ring improves the retention of the isolation device within the tubular shaft.

[0038] The radial outer annular ring may specifically include a plurality of second openings. The number of second openings is preferably equal to the number of filter air outlet orifices of the first annular member.

[0039] The isolation device may include radial guide vanes that extend axially and radially inward from the radially outer annular ring, located at the periphery of the second opening. The use of radial guide vanes allows for improved mechanical strength of the isolation device, and also guides the filtered airflow radially toward the first channel.

[0040] Radial guide vanes can be specifically attached to the circumferential bottom wall of the isolation device.

[0041] Each radial guide vane may include a radially inner end opposite the radially outer annular ring. The radially inner end of the radial guide vane is free. The radially inner end of the radial guide vane is advantageously arranged at substantially the same radial position as the radially inner annular ring. This arrangement causes the filtered air leaving the first annular member to be initially guided radially to the level of the radially inner annular ring, and then axially toward the interior of the radially inner annular ring.

[0042] Advantageously, the gear is axially arranged between the first annular member and the second annular member. This configuration provides balanced mounting of the annular members on the tubular shafts on both sides of the gear.

[0043] An annular filter may include multiple filter elements, and the annular body may form multiple circumferentially adjacent chambers separated by radial walls of the annular body, each chamber accommodating one of the multiple filter elements.

[0044] Annular filters can be made specifically from cross-linked foam or porous materials.

[0045] According to another aspect, a turbine accessory gearbox is proposed, which includes the components described above. The components described above are installed inside the accessory gearbox.

[0046] Advantageously, the accessory gearbox includes a housing that accommodates a plurality of power take-off units capable of being driven by the turbine shaft and capable of driving at least one accessory device to rotate. Each power take-off unit specifically includes a shaft and at least one gear rotatably coupled to the shaft. This assembly is specifically arranged at one power take-off unit of the accessory gearbox.

[0047] The accessory gearbox may include multiple components as described above, each of which is mounted on a separate power take-off unit of the accessory gearbox.

[0048] On the other hand, a turbine is proposed that includes an accessory gearbox as described above. Attached Figure Description

[0049] Further features, details, and advantages will become apparent from the following detailed description and review of the accompanying drawings, in which: Figure 1 Figure 1 A cross-sectional view of an example of a separation device according to the prior art is shown schematically.

[0050] Figure 2 Figure 2 A cross-sectional view of another example of a separation device according to the prior art is shown schematically.

[0051] Figure 3 Figure 3 A cross-sectional view of a component according to one embodiment is shown schematically.

[0052] Figure 4 Figure 4 Two views of a component according to one embodiment are schematically shown. Figure 4 A and Figure 4 B).

[0053] Figure 5 Figure 5 A view of an isolation device according to one embodiment is shown schematically. Detailed Implementation

[0054] Figure 3 , Figure 4 and Figure 5 Component 1 for a turbine accessory gearbox is shown at least partially. This component is installed inside the accessory gearbox.

[0055] An accessory gearbox typically includes a housing that houses a plurality of power take-off units capable of being driven by a turbine shaft and capable of driving at least one accessory device to rotate. Each power take-off unit specifically includes a shaft and at least one gear rotatably coupled to the shaft. Components according to this disclosure are specifically mounted on one power take-off unit of the accessory gearbox. The accessory gearbox may include multiple components, each mounted on a separate power take-off unit of the accessory gearbox.

[0056] Component 1 includes a tubular shaft 2 intended to be driven to rotate about a rotation axis X, and a gear 3 rotatably connected to the tubular shaft 2. The tubular shaft includes a first internal tubular channel 21 coaxial with the tubular shaft 2.

[0057] The terms "axial" and "radial" are defined relative to the axis of rotation X of the rotating tubular shaft.

[0058] More specifically, gear 3 includes an annular disk 31, which carries a set of teeth at its radially outer end for rotatably engaging with a set of teeth of the corresponding gear.

[0059] Component 1 includes at least one, preferably a first 4a and a second 4b, an air / oil mixture separating annular member, which is arranged around and rotatably integrated with the tubular shaft 2. The air / oil mixture separating annular member is also referred to as an oil separator. The first annular member 4a is arranged upstream of the second annular member 4b in the direction in which filtered air flows through the first channel 21.

[0060] This disclosure provides at least two distinct air / oil mixture filtration paths by employing two different air / oil mixture separation annular members. Therefore, this configuration increases the airflow cross-section, thereby reducing the pressure drop of the assembly and, more broadly, the pressure drop of the turbine. Furthermore, this disclosure enables improved compactness of the device for separating air / oil mixtures by compactly integrating the at least two air / oil mixture separation annular members into an accessory gearbox.

[0061] like Figure 3 As shown, gear 3 can be axially arranged between the first annular member 4a and the second annular member 4b. This configuration allows for balanced mounting of the annular members on the tubular shafts on both sides of the gear.

[0062] Each annular component 4a, 4b includes an annular body 41a, 41b that houses the annular filters 42a, 42b. The annular filters of each of the two annular components are fluidly separated from each other.

[0063] Each annular body 41a, 41b specifically includes a radially extending bottom wall and a radially outer annular wall, the radially outer annular wall being connected at one axial end to the radially outer end of the bottom wall.

[0064] The annular filters 42a and 42b may include multiple filter elements, and the annular body may form multiple circumferentially adjacent chambers separated by radial walls of the annular body. Each of the multiple chambers contains one of the multiple filter elements. The annular filters 42a and 42b may be made, in particular, of cross-linked foam or porous material.

[0065] Each annular body 41a, 41b includes an air / oil mixture inlet 43a, 43b, an oil outlet 44a, 44b extending radially outward to the outside of the annular body 41a, 41b, and a filtered air outlet 45a, 45b extending radially inward to the inside of the annular body.

[0066] The air / oil mixture inlets 43a and 43b are specifically axially aligned with the openings of the annular filters 42a and 42b. The air / oil mixture inlets 43a and 43b may be specifically arranged at one axial end of the annular bodies 41a and 41b.

[0067] Air / oil mixture inlets 43a, 43b may include one or more air / oil mixture inlet orifices, each orifice being annular. Specifically, an air / oil mixture inlet may include 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, an air / oil mixture inlet may specifically include multiple air / oil mixture inlet orifices circumferentially distributed at one axial end of the annular body 41a, 41b.

[0068] Oil outlets 44a and 44b may include one or more oil outlet orifices, each orifice being annular. The oil outlet orifices are specifically circumferentially distributed on the radial outer walls of the annular bodies 41a and 41b. The oil outlet orifices may form annular rows of one or more oil outlet orifices, each annular row of oil outlet orifices being axially spaced from each other.

[0069] Filtered air outlets 45a, 45b may include one or more filtered air outlet orifices, each orifice being annular. Specifically, the filtered air outlets are arranged to at least partially face one or more orifices 22a, 22b of the tubular shaft. Specifically, when the filtered air outlet includes a single filtered air outlet orifice, the filtered air outlet may form a filtered air outlet orifice facing one or more orifices 22 of the tubular shaft, the orifice extending annularly. Alternatively, when the filtered air outlet includes multiple filtered air outlet orifices, the filtered air outlet orifices may form one or more annular rows of filtered air outlet orifices, each annular row of filtered air outlet orifices being axially spaced apart from each other.

[0070] Specifically, each air / oil mixture separating annular member is configured such that the air / oil mixture enters each annular member via a corresponding air / oil mixture inlet, and then rotates within the annular member, such that the oil contained in the air / oil mixture is centrifugally separated radially outward from the annular member through a corresponding oil outlet by centrifugal force, and the filtered air flows radially inward through the filtered air outlet.

[0071] In addition, the component may include an air circulation device that allows air circulation between the air / oil mixture inlet of the annular body and the interior of the tubular shaft during operation.

[0072] In addition, refer to Figure 3 , Figure 4 A, Figure 4 B and Figure 5 The filtered air outlet 45a of the first annular component 4a is radially directed to the first channel 21.

[0073] Component 1 includes an isolation device 5 for filtering airflows, particularly for isolating filtered airflows originating from the first and second annular members, respectively. The isolation device is mounted radially inside the tubular shaft 2 and is rotatably integrated with the tubular shaft 2. The isolation device 5 includes at least one axially extending second channel 51 arranged radially outside the first channel 21. The at least one second channel 51 is in fluid communication upstream with a filtered air outlet 45b of one of the at least one annular members, particularly with the second annular member 4b, and downstream with the first channel 21. Specifically, the filtered air outlet 45b of the second annular member 4b radially opens into the interior of the at least one second channel 51.

[0074] The second channel 51 is specifically defined axially by a closed upstream axial end 52 and a downstream axial end 53 leading to the first channel 21.

[0075] Specifically, the second channel 51 leads axially, preferably downstream, and particularly downstream of the second annular member, to the first channel 21.

[0076] This disclosure provides at least two distinct air / oil mixture filtration paths by employing two different air / oil mixture separating annular members. Therefore, this configuration increases the airflow cross-section, thereby reducing the pressure drop of the assembly and, more broadly, the pressure drop of the turbine. Furthermore, this disclosure enables improved compactness of the device for separating air / oil mixtures by compactly integrating the at least two air / oil mixture separating annular members into an accessory gearbox.

[0077] Furthermore, the implementation of the air / oil mixture separation isolation device further improves the filtration performance of the annular member for the air / oil mixture. In fact, fluid separation of the filtered air discharged from each annular member separately limits 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. Therefore, this configuration enables a reduction in the pressure drop of the assembly.

[0078] Advantageously, the isolation device 5 is integrally formed with the tubular shaft.

[0079] Alternatively, the isolation device 5 may be a component separate from the tubular shaft 2, intended to be installed radially inside the tubular shaft 2. This feature advantageously facilitates the installation and maintenance of the isolation device.

[0080] More specifically, the isolation device 5 includes a radially inner annular ring 54 and a radially outer annular ring 55, which are coaxial and define a second channel 51 between them. The radially inner annular ring specifically forms a wall that radially defines the first and second channels. The radially outer annular ring 55 can be mounted specifically against the wall 24 of the first channel 21.

[0081] The isolation device 5 specifically includes a circumferential bottom wall 60 that connects the radially outer annular ring 55 to the radially inner annular ring 54. The circumferential bottom wall 60 is specifically positioned at the upstream axial end 52 of the second channel. This wall closes the upstream axial end of the second channel. The circumferential bottom wall 60 may, in particular, include a surface sloping from upstream to downstream at its upstream end to facilitate the flow of air filtered by the first annular member 4a.

[0082] The radially outer annular ring 54 advantageously includes at least one first opening 56 that radially faces the filtered air outlet 45b of the second annular member 4b. Therefore, filtered air exiting the filtered air outlet of the second annular member can radially pass through the at least one first opening to radially access the second channel.

[0083] The radial outer annular ring 55 may specifically include a plurality of first openings 56. The number of first openings is preferably equal to the number of filtered air outlet orifices of the second annular member 4b.

[0084] Furthermore, the isolation device may specifically include a plurality of second channels 51, which are circumferentially distributed, preferably at regular intervals, 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 isolation device may include 6 to 10 second channels.

[0085] The isolation device may specifically include first radial walls 58 that extend axially and radially between the radially inner annular ring 54 and the radially outer annular ring 55, and circumferentially separate the second channels 51 from each other. The use of the first radial walls 58 makes it possible to improve the mechanical strength of the isolation device in particular, and to guide axial flow within the second channels in another respect.

[0086] Advantageously, the radially outer annular ring 55 extends axially upstream beyond the filtered air outlet 45a of the first annular member 4a. The radially outer annular ring 55 specifically includes at least one second opening 57 radially facing the filtered air outlet 45a of the first annular member 4a. Therefore, filtered air exiting the filtered air outlet of the first annular member can radially pass through the at least one second opening to radially direct towards the first channel. This configuration of the radially outer annular ring improves the retention of the isolation device within the tubular shaft.

[0087] The radial outer annular ring 55 may specifically include a plurality of second openings 57. The number of second openings 57 is preferably equal to the number of filtered air outlet orifices 45a of the first annular member 4a.

[0088] The isolation device 5 may include radial guide vanes 59 extending axially and radially inward from the radially outer annular ring 55, located at the periphery of the second opening 57. The use of radial guide vanes 59 enables, in particular, to improve the mechanical strength of the isolation device on the one hand, and to guide the filtered airflow radially toward the first channel on the other hand.

[0089] The radial guide vane 59 can be specifically connected to the circumferential bottom wall 60 of the isolation device.

[0090] Each radial guide vane 59 may include a radially inner end opposite to the radially outer annular ring 55. The radially inner end of the radial guide vane 59 is free.

[0091] The radially inner end of the radial guide vane 59 is advantageously arranged at substantially the same radial position as the radially inner annular ring 54. This arrangement causes the filtered air leaving the first annular member to be initially guided radially to the level of the radially inner annular ring 54, and then axially toward the interior of the radially inner annular ring.

Claims

1. An assembly (1) for a turbine accessory gearbox, the assembly (1) comprising: - A tubular shaft (2) designed to be driven to rotate about a rotation axis (X) and including a first internal tubular channel (21) coaxial with the tubular shaft (2), - a gear (3) rotatably connected to the tubular shaft (2), and - at least one annular member (4a, 4b) arranged around the tubular shaft (2) and rotatably integrated with the tubular shaft (2) and separated from an air / oil mixture, said at least one annular member (4a, 4b) including an annular body (41a, 41b) housing an annular filter (42a, 42b), each annular body (41a, 41b) including an air / oil mixture inlet (43a, 43b), an oil outlet (44a, 44b) radially outward to the outside of the annular body (41a, 41b), and a filtered air outlet (45a, 45b) radially inward to the inside of the annular body (41a, 41b). The component (1) includes an isolation device (5) for filtering airflow, the isolation device (5) being mounted radially inside the tubular shaft (2) and being rotatably integrated with the tubular shaft (2), the isolation device (5) including at least one second channel (51) extending axially and arranged radially outside the first channel (21), the at least one second channel (51) being in fluid communication upstream with the filtered air outlet (45b) of one of the at least one annular member (4a, 4b).

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

3. The component (1) according to claim 2, characterized in that, The first annular member (4a) is arranged upstream of the second annular member (4b) in the direction in which the filtered air flows through the first channel (21), the filtered air outlet (45a) of the first annular member (4a) is radially connected to the first channel (21), and the at least one second channel (51) is in fluid communication upstream with the filtered air outlet (45b) of the second annular member (4b) and in fluid communication downstream with the first channel (21).

4. The component (1) described in combination with claim 2 according to any one of the preceding claims, characterized in that, The second channel (51) extends axially downstream of the second annular member (4b) to the first channel (21).

5. The component (1) according to any one of the preceding claims, characterized in that, The isolation device (5) includes a radially inner annular ring (54) and a radially outer annular ring (55), which are coaxial and define a second channel (51) therebetween. The radially outer annular ring (54) includes at least one first opening (56) that radially faces the filtered air outlet (45b) of the second annular member (4b).

6. The component (1) according to the combination of claim 5 and claim 2, characterized in that, The radially outer annular ring (55) extends axially upstream beyond the filtered air outlet (45a) of the first annular member (4a), and the radially outer annular ring (55) includes at least one second opening (57) that radially faces the filtered air outlet (45a) of the first annular member (4a).

7. The component (1) according to any one of the preceding claims, characterized in that, The isolation device (5) includes a plurality of second channels (51) which are circumferentially distributed, preferably at regular intervals, around the axis of rotation (X).

8. The component (1) according to the combination of claim 7 and claim 2, characterized in that, The filtered air outlet (45b) of the second annular member (4b) includes a plurality of filtered air outlet orifices, and the number of the second channels (51) is equal to the number of filtered air outlet orifices of the second annular member (4b).

9. The component (1) according to any one of the preceding claims, characterized in that, The isolation device (5) is integrally formed with the tubular shaft (2).

10. The component (1) according to any one of claims 1 to 8, characterized in that, The isolation device (5) is a component separate from the tubular shaft (2) and is designed to be installed radially inside the tubular shaft (2).

11. The component (1) described in combination with claim 2 according to any one of the preceding claims, characterized in that, The gear (3) is axially arranged between the first annular member (4a) and the second annular member (4b).

12. A turbine accessory gearbox comprising the component (1) according to any one of the preceding claims.

13. A turbine comprising an accessory gearbox as claimed in the preceding claim.

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