Technical Field of the Invention

A de-oiler system for an air / pressurizing oil seals or pressurized speaker of a turbomachine, such as carbon rings, gaskets brushes, mazes, etc.

2. BACKGROUND

Turbomachinery are complex systems that implement a number of rotating assemblies (turbines, compressors, etc.) must be equipped with seals. These seals are made for example by pressurized air labyrinths built in the vicinity of rotating assemblies or by join brushes or carbon rings. To do this, an air is taken directly in the air stream of the turbine engine. This air then passes through the turbine engine by the various seals provided for this purpose and then is discharged to the outside of the turbine engine to limit the rise in pressure in other areas of the turbine engine, including the gear box accessory etc. However, this air having passed through different areas of the turbomachine, it is loaded in oil used for cooling and lubrication of bearings and gears of the rotating assemblies. To avoid the charge air discharge of oil, reduce the environmental impact of turbine engines, reduce oil consumption and limit the oil reserves filling, it is important to provide air mixture oiling systems / oil pressurization in order to recover on the one hand and oil on the other hand discharging a deoiled air outwardly of the turbomachine.

It is known that such an oiling system of an air / oil seals pressurization or pressurized enclosures of a turbine engine includes:

- at least one centrifugal degasser comprising a chamber for separating the mixture arranged around a drive shaft, a mixture inlet into said enclosure, an air outlet deoiled

and an oil outlet extracted from said mixture,

- at least one mechanical housing of the turbomachine comprising a plurality of mechanical parts which at least one is connected mechanically to said drive shaft of said degasser so as to drive it in rotation, said housing being configured to contain a mist lubricating oil of said mechanical parts.

It is also known that the degasser is arranged directly in the mechanical chassis to ensure his training. This mechanical housing includes a plurality of mechanical parts which at least one to one gear, for example-is mechanically connected, directly or indirectly, to the shaft of the degasser in order to permit the rotational driving of the deaerator. The mechanical housing is typically an accessory box or reducer of the engine.

The entire mechanical housing and degasifier form oiling system of the air / oil pressurized pressurized seals or speakers.

In a known de-oiler system, the air / oil mixture enters the mechanical housing to be processed by the deaerator which is directly arranged in the mechanical box. Thus, the air / oil pressurisation is mixed with the oil mist present in the mechanical box, and it is the assembly formed by the air / oil and pressurizing of the oil mist of the mechanical housing the deaerator trafficking in the separation chamber.

The inventors have tried to improve the yields of known oiling systems.

In particular, the inventors have sought to provide an oil removal system to minimize the amount of oil discharged to the outside. In particular, the reduction of oil consumption remains turbomachinery access to major progress. This is designed to optimize the amount of oil onboard and thus reduce the mass of the engine. This should also help to increase the duration of missions. This should also reduce maintenance on the turbine. Finally, it should improve the environmental impact of the engines.

3. Objectives of the invention

The invention aims to provide an oil removal system which overcomes at least some of the disadvantages of known systems.

The invention aims in particular to provide, in at least one embodiment, an oiling system that optimizes the efficiency of the aerators.

4. Summary of the Invention

To do this, the invention relates to a system for de-oiling an air / speaker pressurizing pressurized oil of a turbomachine, said system comprising:

- at least one centrifugal degasser comprising a separation chamber of said mixture arranged around a drive shaft, a mixture inlet into said enclosure, a deoiled air outlet and an oil outlet extracted from said mixture,

- at least one mechanical housing of the turbomachine comprising a plurality of mechanical parts which at least one is connected mechanically to said drive shaft of said degasser so as to drive it in rotation, said housing being configured to contain a mist lubricating oil of said mechanical parts.

A de-oiler system according to the invention is characterized in that it comprises means for isolating said oil / air mixture from said oil mist said mechanical housing so that said housing of said mechanical oil mist can not enrich the oil to said mixture to be separated by said degasser, and in that it comprises a double deaerator configured to process in a first enclosure air pressurized enclosures and in a second enclosure, the air of the mechanical housing.

In other words, the invention arranges a physical separation between the air / oil having circulated in pressurized enclosures of the turbomachine and the mechanical housing part in the rotational driving of the deaerator. In particular, the air / oil mixture to be separated by the degasser de-oiler system is isolated from the oil mist present in the mechanical case. This isolation prevents the enrichment of the air / oil pressurized from the speakers of the turbine engine in oil from the oil mist from the mechanical housing.

A system according to the invention also allows a decrease in the temperature of the mechanical housing by limiting heat exchange between the air / oil mixture from pressurized speaker of the turbomachine, which is a warm mixture, and the oil mist of the housing mechanical. An oil removal system according to the invention therefore reduces the cooling requirements of the mechanical housing.

Pregnant pressurized of a turbomachine may be formed depending on the architecture selected by carbon rings, gaskets brushes, labyrinths, or similar devices. Advantageously and according to the invention, said means for isolating said mixture comprises a pipe connecting directly an output of said pressurized speakers to said input of said mixture in said chamber of said getter such that said pressurized mixture speakers directly supplies said degasser without interaction with said oil mist of the mechanical housing.

According to this variant, the de-oiler system comprises a conduit connecting a speaker output of the turbomachine pressurized to the degasser mixture inlet. Thus, this behavior isolates the mixture flow between the pressurized enclosures and degassing of oil mist present in the mechanical housing. This conduct prevents the enrichment of the air / oil mixture from the speakers by pressurized oil lubrication of mechanical housing.

Advantageously and according to this embodiment, the getter is accommodated in said mechanical housing and said pipe passes through said mechanical housing.

This advantageous variant keeps an architecture architecture known systems, that is to say to maintain the getter in the mechanical housing, but to isolate the mixture of fog by development

a conduit between the inlet of pressurized degasser and speakers. To do this, the pipe passes through the mechanical housing.

Advantageously and according to this embodiment, said drive shaft of said getter is hollow and forms at least a portion of said conduit connecting said chambers of the turbomachine pressurized at the inlet of the getter.

For example, in an advantageous variant of the invention, said drive shaft of said getter is hollow and permits aspiration of the mixture into the enclosure between the mechanical box and an air inlet casing of a compressor of the turbine engine.

This variant also usefully advantage of the drive shaft of the degasser to make it play, in addition to its role of moving the degasser, a part path of the mixture to be separated and means for isolating the mixture of fog oil present in the mechanical case.

Advantageously and according to another variant of the invention, said getter is arranged outside said housing and said mechanical drive shaft of said degasser through said mechanical housing, said housing forming said mechanical isolation means of said mixture relative to fog oil.

In this embodiment, the getter is arranged outside the mechanical housing, the housing of the mechanical housing thereby forming the isolation means of the mixture to the oil mist.

For example, in an advantageous variant of the invention, the getter is arranged between the mechanical box and an air inlet casing of a compressor of the turbomachine.

Advantageously and according to the invention, said mechanical housing is a gear housing or accessory housing of the turbomachine.

Advantageously and according to the invention, the oil outlet of said degasser opens into said mechanical housing.

In this embodiment, the oil extracted by the getter can be used to lubricate mechanical parts of the mechanical housing.

The invention also relates to a turbine engine comprising a de-oiler system according to the invention.

A turbine engine of the invention equipped with an oiling system of the invention thus uses less oil than gas turbine engine of the prior art by improved oil recovery. A turbine engine of the invention has a lighter weight than a turbine engine of the prior art. The duration of a mission of a helicopter equipped with turbine engines according to the invention is therefore longer. In addition, maintenance is less frequent. Finally, the ecological impact of a turbine engine of the invention is better than that of the engines of the prior art.

The invention also relates to a degasser and a turbomachine characterized in combination by all or some of the features mentioned above or below.

5. List of Figures

Other objects, features and advantages of the invention will appear on reading the following description given by way of non-limiting and which refers to the appended figures in which:

- Figure 1 is a functional schematic view of a de-oiler system for an air / pressurizing oil seals of a turbomachine according to the prior art,

- Figure 2 is a functional schematic view of a system of de-oiling an air / pressurizing oil seals of a turbomachine according to the invention,

- Figure 3 is a schematic view of a getter of a de-oiler system according to an embodiment of the invention.

6. Description of an embodiment of the invention In the figures, scales and proportions are not strictly complied with, for purposes of illustration and clarity.

The same references are used in different figures for the different elements of a de-oiler system having a function identical or similar.

It is observed in Figure 1, a shaft 10 of a turbomachine fitted with a deoiling the prior art system. This shaft 10 is for example the shaft of a gas generator and a free turbine line of a turbine engine of a helicopter. A pressurized air, shown by arrows 11 in solid lines, is injected into the seals to seal the pressurized speakers 13 of the turbomachine. This air 11 becomes laden with oil during its circulation in pressurized enclosures 13. In Figure 1, there is shown an air and oil mixture flowing along the shaft 10 of the turbomachine. The dashed lines 11 show the air and dashed lines 12 show the oil mixture.

According to the prior art, the de-oiler system of the air / oil seals 13 comprises a centrifugal degasser 20 which is housed in a box 30 with accessories. Such accessories box 30 includes a plurality of sprockets 21, 22 which are arranged relative to each other and mechanically connected so as to recover mechanical power on the shaft 10 of the turbomachine and provide this mechanical power different easement necessary for the operation of the turbomachine, and in particular the centrifugal degasser 20 to provide rotational driving thereof.

Accessories box 30 further comprises a nozzle 32 for supplying the oil 33 to lubricate various mechanical parts housed in the box 30 accessories, such as in particular the gears 21, 22. This nozzle 32 is supplied with oil by a supply 35 arranged oil outside the box 30 attachments.

According to the prior art, the oil / air mixture necessary for sealing pressurized speaker 13 is injected directly into the box 30 accessories so that the getter addresses the assembly formed of the air / oil pressurized enclosures 13 and fog 39 d oil present in the accessory box formed in particular by oil 33 emitted by the nozzle 32 for the lubrication of mechanical parts.

2 shows very schematically the configuration of the de-oiler system according to an embodiment of the invention. According to the invention, the air / oil pressurized enclosures 13 of the turbomachine is not injected directly into the box 30 accessories, but is guided

directly to the input 27 of the degasser via a conduit 40 which connects the pressurized enclosures 13 to the input 27 of the degasser. This pipe 40 thus isolates the air / oil mixture from pressurized pregnant 13 relative to this oil mist 39 in the box 30 accessories.

The arrangement of the pipe 40 between the outlet of the pressurized vessels 13 and the inlet 27 of the degasser therefore prevents the oil mist from the box 30 enriched in oil the air / oil pressurized speaker 13 to be separated by the deaerator 20.

The degasser 20 further includes an outlet 28 of oil extracted from the mixture and an outlet 29 for de-oiled air.

According to one embodiment of the invention, the outlet 28 of oil is directly connected to the inside of the box 30 accessories so as to lubricate mechanical parts of the box.

According to another embodiment not shown, the oil extracted from the mixture 35 is injected into the oil reservoir.

This conduct may, for example through the box 30 accessories so that the degasser 20 remains housed in the accessory box.

According to another embodiment not shown, the degasser is housed outside of the accessory box and driving it in rotation is obtained by a shaft passing through the box 30 attachments. The mixture supply can be either realized by a conduit such as that described in connection with the embodiment of Figure 2, or by direct diffusion of the mixture into the inlet of the deaerator.

According to another variant shown in Figure 3, the supply of the degasser 20 in the air / oil mixture is carried through the shaft 52 for driving the deaerator. This drive shaft 52 is hollow such that an end 53 of the shaft can receive the mixture to be treated and the other end 54 of the shaft opposite allows the evacuation of deoiled air mixture. A partition 70 provided in the hollow shaft 52 also makes it possible to separate the inlet 53 from the outlet 54 and thus forces the passage of the air mixture in the speakers 58a, 58b of the degasser. The circulation of the mixture from the

turbine, that is to say the shaft 10 to the input 53 of the degasser is shown schematically by the arrows 59 in Figure 3.

According to this embodiment, the deaerator is further rotated through a sprocket 60 mounted integrally on the hollow shaft 52 and rotated by the shaft 10.

Figure 3, is also observed that the degasser comprises two degassing arranged on its drive shaft enclosures, a chamber 58a for treating the air / oil mixture from seals and drawn into an air inlet housing as described above, and a speaker 58b for treating the oil mist present in the interior of the box accessories. According to another alternative, the getter may comprise only degassing enclosure.

CLAIMS

oiling system of an oil / air mixture (11, 12) speaker pressurization pressurized (13) of a turbomachine, said system comprising:

- at least a degasser (20) comprising a centrifugal separation chamber of said mixture arranged around a shaft (52) driving, an inlet (27, 53) in said mixing chamber, an air outlet (29, 54) deoiled and an oil outlet (28) extracted from said mixture,

- at least one housing (30) Mechanical turbomachine comprising a plurality of parts (21, 22) which lift at least one of which is connected mechanically to said drive shaft of said deaerator (20) so as to drive it in rotation, said housing (30) being configured to contain a mist (39) of lubricating oil of said parts (21, 22) mechanical,

characterized in that said de-oiler system further comprises means (40) isolating said oil / air mixture (11, 12) relative to said spray (39) of oil from said housing (30) mechanically so that said mist (39) of said oil housing (30) mechanical can not enrich the oil to said mixture to be separated by said degasser, and in that it comprises a getter (20) Double configured to process in a first enclosure (58a ) air pressurized chambers (13) and a second chamber (58b), the air of the mechanical box (30).

2. System according to claim 1, characterized in that said isolating means include a mixture of said conduit (40) directly connecting an output of said pressurized chambers (13) to said input (27, 53) of said mixture in said chamber of said deaerator (20) such that said pressurisation mixture pressurized speakers directly supplies said degasser without interaction with said mist (39) of oil from the mechanical housing.

3. System according to claim 2, characterized in that said getter (20) is accommodated in said housing (30) mechanical and in that said conduit (40) through said housing (30) mechanically.

4. The system of claim 3, characterized in that said shaft (52) for driving said degasser is hollow and forms at least a portion of said conduit (40) connecting said pressurized enclosures of the turbomachine to the input 5. The system according to claim 2, characterized in that said getter (20) is arranged between the housing (30) and a mechanical air inlet casing of a compressor of the turbomachine.

6. The system of claim 1, characterized in that said getter (20) is arranged outside said housing (30) mechanical and in that said shaft (52) for driving said degasser through said housing (30) Mechanical , said housing (30) forming said mechanical isolation means of said mixture to the oil mist of the mechanical housing (30).

7. The system of claim 7, characterized in that said getter (20) is arranged between the housing (30) and a mechanical air inlet casing of a compressor of the turbomachine.

8. System according to one of claims 1 to 8, characterized in that said housing (30) mechanism is a gear housing or accessory housing of the turbomachine.

9. System according to one of claims 1 to 9, characterized in that said oil discharge outlet of said degasser opens into said housing (30) mechanically.

10. System according to one of claims 1 to 9, characterized in that said outlet of said getter oil discharge opens into an oil reservoir (35).

11. A turbomachine comprising a de-oiler system according to one of claims 1 to 10.