Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
  • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
  • F01M11/03—Mounting or connecting of lubricant purifying means relative to the machine or engine; Details of lubricant purifying means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D19/00—Degasification of liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D19/00—Degasification of liquids
  • B01D19/0042—Degasification of liquids modifying the liquid flow
  • B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
  • B01D19/0057—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused the centrifugal movement being caused by a vortex, e.g. using a cyclone, or by a tangential inlet
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
  • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
  • F01M11/0004—Oilsumps
  • F01M2011/0029—Oilsumps with oil filters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
  • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
  • F01M11/03—Mounting or connecting of lubricant purifying means relative to the machine or engine; Details of lubricant purifying means
  • F01M2011/031—Mounting or connecting of lubricant purifying means relative to the machine or engine; Details of lubricant purifying means characterised by mounting means
  • F01M2011/038—Mounting or connecting of lubricant purifying means relative to the machine or engine; Details of lubricant purifying means characterised by mounting means comprising lubricant-air separators

Definitions

• the invention relates to the field of lubrication, more particularly the lubrication of engines, more particularly still the lubrication of turbomachines, in particular aircraft.
• Turbomachinery lubrication systems in particular aircraft turbomachinery, essentially and conventionally comprise one or more oil recovery pumps from the turbomachine, an oil storage device with a reservoir and one or more oil feed pumps to the turbomachine.
• the oil storage device conventionally includes an oil deaerator at the inlet of the tank, in order to separate the air contained in the oil.
• the lubrication enclosures of a turbomachine in fact work with oil mists comprising air, so that the oil routed to the oil storage device comprises air and must be deaerated before discharging. be reinjected into the lubrication enclosures by the feed pump(s).
• EP 3 150265 A1 discloses an oil deaeration device for a turbomachine lubrication system, comprising a tank and an oil deaerator of a particular type, namely with a rotor driven by the air-laden oil supply rate.
• More conventional oil deaerators are of the cyclone type, where the mixture of oil and air follows a spiral path, the oil being projected against a generally cylindrical wall and flowing towards the tank by gravity, and the air venting centrally upwards.
• the oil flowing from the oil deaerator to the tank may still include a little air, so that a buffer volume in the bottom of the tank is necessary to allow a final deaeration. It is in fact important that the oil leaving the reservoir and conveyed to the turbomachine by the circulation pump(s) be free of air. This buffer volume, to perform this function, often turns out to be large and imposes a large reservoir size.
• the object of the invention is to overcome at least one drawback of the aforementioned state of the art. More particularly, the object of the invention is to propose an oil deaeration device for a lubrication system, which is more compact.
• the subject of the invention is an oil reservoir for a turbomachine lubrication system, comprising: an internal volume with a bottom, an oil outlet, and an oil inlet; remarkable in that the oil reservoir further comprises a stabilizing wall arranged in the internal volume facing the bottom and provided with at least one passage for the oil, so as to delimit a volume of stabilized buffer oil.
• the oil outlet is located at a lower part of the internal volume, when the reservoir is in the operational position.
• the oil outlet is located on the bottom or adjacent to the bottom.
• the oil inlet is opposite the bottom.
• the at least one passage for the oil in the stabilization wall forms a total passage section for the oil of less than 60%, preferably less than 50%, more preferably less than 40%, of a total section of said stabilization wall.
• the at least one passage for the oil in the stabilization wall forms a total passage section for oil greater than 1%, preferably greater than 5%, of a total section of said stabilization wall.
• the at least one passage for the oil in the stabilization wall comprises a limited number of said at least one passage for the oil, greater than 2 and/or less than 10 .
• the limited number of oil passages are arranged along the periphery of the stabilization wall.
• the limited number of oil passages arranged along the periphery of the stabilization wall each have an oblong shape along said periphery.
• the at least one passage for the oil in the stabilization wall comprises a high number of said at least one passage for the oil, greater than 30, preferably greater than 50, said passages for the oil being preferentially distributed homogeneously over the stabilization wall or one or more parts of said stabilization wall.
• the stabilization wall is curved in the shape of a dome with a concavity of said dome facing the bottom.
• the stabilization wall is flat.
• the oil tank further comprises a strainer projecting from the bottom, forming the oil outlet.
• the strainer is aligned with the dome shape of the stabilization wall.
• the stabilization wall has an average diameter and is at an average distance from the bottom equal to or less than 60%, preferably 50%, of said average diameter.
• At least 80% of the internal volume corresponds to a constant cross section extending in a longitudinal direction of said internal volume.
• the oil reservoir comprises one or more walls delimiting the internal volume, said wall or walls being metallic.
• This or these walls can be produced in particular by aluminum foundry, by mechanically welded assembly or by additive manufacturing.
• the wall(s) of the tank comprise two parts assembled together, in particular by flanges, the stabilization wall being located between said two parts.
• the invention also relates to an oil deaeration device comprising an oil tank according to the invention and an oil deaerator at the oil inlet of the oil tank.
• the oil deaerator is of the cyclonic type with a tubular wall inserted longitudinally into the tank.
• the internal volume is free of filter element between the oil deaerator and the stabilization wall.
• the measures of the invention are interesting in that they make it possible to reduce the buffer volume of oil while improving the separation of air from the oil. Reducing the oil buffer volume also reduces the size of the reservoir and therefore of the oil deaeration device.
• Figure 1 is a sectional view of an oil deaeration device for a lubrication system according to the state of the art (left) and according to the invention (right).
• Figure 2 illustrates in perspective a stabilization wall according to a first embodiment.
• Figure 3 illustrates in perspective a stabilization wall according to a second embodiment.
• FIG. 1 in the right illustration, a sectional view of an oil deaeration device with an oil reservoir, for a lubrication system, according to the invention.
• the illustration on the left is an oil deaeration device with an oil reservoir, for a lubrication system, according to the state of the art.
• the oil deaeration device 2, according to the invention essentially comprises an oil tank 4, according to the invention, and an oil deaerator 6 arranged at the inlet of the oil tank 4.
• the oil tank 4 comprises a wall 8, in this case generally cylindrical, it being understood that other shapes are possible.
• the wall 8 advantageously extending in a longitudinal direction, corresponding to a vertical direction in Figure 1.
• the wall 8 delimits an internal volume 10 of the oil reservoir 4.
• the internal volume 10 in question comprises a bottom 10.1 intended to receive an oil buffer volume 12.
• the latter is delimited not only by the bottom 10.1 of the internal volume 10 but also by a stabilization wall 14 arranged opposite said bottom 10.1. This stabilization wall 14 is fixed against an internal face of the wall 8 so as to separate the oil buffer volume 12 from the rest of the internal volume 10 of the oil reservoir 4.
• the stabilization wall 14 comprises one or more passages for the oil so as to allow a transfer by gravity of the oil coming from the oil deaerator 6 towards the oil buffer volume 12. These oil passages are however dimensioned so that the stabilization wall forms a barrier to the oil, capable of stabilizing the oil during movements of the oil tank 4, while allowing the transfer of the oil to the oil buffer volume 12.
• the oil passages form a section of total passage for the oil which is less than 60%, preferably less than 50%, more preferably less than 40%, of the total section of said stabilization wall, and greater than 1%, preferably greater than 5%, of said total section of said stabilizer wall ation.
• the shape and distribution of the oil passages of the stabilization wall 14 will be detailed later in relation to Figures 2 and 3.
• the stabilization wall 14 is advantageously located at a reduced distance from the bottom 10.1 of the internal volume 10, namely at an average distance less than 60%, preferably 50%, of an average diameter of the stabilization wall 14. This distance is to be considered along a direction parallel to the longitudinal axis of the oil reservoir 4 and between the faces opposite the stabilization wall 14 and the bottom 10.1 of the internal volume 10. This reduced distance makes it possible to reduce the oil buffer volume 12 while maintaining a function of final deaeration of the oil coming from the inlet to the oil tank, in this case the oil deaerator 6.
• the oil reservoir 4 may also include a strainer 16 projecting from the bottom 10.1 of the internal volume 10, this strainer being in fluid communication with the outlet 18 of the oil reservoir 4.
• the stabilization wall 14 may have a curved profile, in the shape of a dome with the concavity oriented towards the bottom 10.1 of the internal volume 10.
• the strainer 16, aligned with the longitudinal axis, is advantageously aligned with the dome shape of the stabilization wall 14.
• the stabilization wall 14 can have a flat profile.
• the oil tank 4 may comprise an intermediate wall 20 disposed in the internal volume 10 between the stabilization wall 14 and the oil inlet, in this case the oil deaerator 6.
• This intermediate wall 20 is perforated so as to allow a transfer of the oil by gravity from the inlet of the oil tank 4, in this case from the oil deaerator 6, towards the bottom 10.1 of the internal volume 10.
• the passage section total of the openings is advantageously greater than the total passage section of the oil passages of the stabilization wall 14.
• the oil deaerator 6 is attached to the oil tank 4 at the oil inlet located opposite the bottom 10.1 of the internal volume 10.
• the oil deaerator 6 comprises an oil inlet 22 and a cyclonic chamber 24 directly downstream of the oil inlet 22.
• the cyclonic chamber is generally cylindrical along an axis aligned or parallel to the longitudinal axis of the tank 4. It is however understood that a slight inclination with respect to the longitudinal axis is possible, for example up to 20°.
• the oil passage between the oil inlet 22 and the cyclonic chamber 24 is in a transverse direction, advantageously perpendicular to the axis of the cyclonic chamber in question.
• This passage is advantageously in a direction tangential to the chamber 24 so as to impart to the flow of oil laden with air a circular spiral path along the inner wall of the cyclonic chamber 24.
• the oil is projected by centrifugal effect against the inner wall of the cyclonic chamber 24 along the tube 26 extending the cyclonic chamber 24 in question, while the lighter air rises axially towards the air outlet 28.
• the latter is annular and aligned with the inner wall of the cyclonic chamber 24 so as to directly collect the oil flowing by gravity along the inner wall in question.
• the tube 26 comprises at least one slot 32 located at a height relative to the bottom of the settling tank, so as to allow the oil to flow from the settling tank, by overflow through said at least one slot 32.
• the oil then flows, from the tube 26, in the internal volume 10 towards the possible intermediate wall 20 and towards the stabilization wall 14.
• the oil in contact with the stabilization wall 14 then flows along said wall until it encounters one or more oil passages and flows into the oil buffer volume 12.
• the layer of oil located above the stabilization wall 14 is potentially subject unstable in that it can be agitated due to vibrations originating from the turbine engine and/or from the aircraft on which the oil deaeration device is mounted and also in that it receives the flows of oil from the oil deaerator 6, possibly via the intermediate wall 20, while the layer located under the stabilization wall 14, namely the oil buffer volume 12, is stabilized with respect to the two sources of instability mentioned above -front and can thus free itself from possible air remaining and avoid any incorporation of air.
• FIG. 1 shows an oil deaeration device with an oil reservoir according to the state of the art and similar to that of the right illustration according to the invention.
• the oil tank according to the state of the art does not include the stabilization wall 14 according to the invention.
• a minimum oil level is shown in broken lines. It is observed that it is substantially higher in the oil reservoir according to the invention, essentially in that the zone of turbulence, shown schematically with the presence of air bubbles, is thicker.
• FIGS 2 and 3 illustrate the stabilization wall 14 according to two embodiments.
• the stabilization wall 14 in Figure 2 is according to a first embodiment of the invention.
• the stabilization wall 14 has a curved profile in the shape of a dome, as described in relation to FIG. the extent of the stabilization wall 14.
• This comprises at its periphery a mounting face 14.2, advantageously cylindrical, intended to contact the internal face of the wall of the tank.
• This mounting face 14.2 may include lugs and/or cavities 14.3 intended to engage with corresponding cavities and/or lugs formed on the inner face of the tank wall.
• the stabilization wall 114 in Figure 3 is according to a second embodiment of the invention.
• the reference numbers of the first embodiment are used to designate identical or corresponding elements, these numbers however being increased by 100. Reference is also made to the description of these elements within the framework of the first embodiment.
• the stabilization wall 114 of the second embodiment differs from that of the first embodiment, essentially in that the passages for the oil through said wall in question are no longer a large number of passages for the reduced passage section oil, but a limited number of passages for the oil, larger passage section.
• the limited number is three and the oil passages 114.1 are oblong along the edge of the mounting face 114.2 of the stabilizer wall 114. It is understood that the limited number of oil passages oil can vary from the number three, for example be one, two, four, five or more. Advantageously, this limited number is less than or equal to ten.
• the passage or passages for the oil form a total passage section or equivalent for the oil, which is less than 60%, preferably less than 50%, more preferably less than 40% of the total section of the stabilization wall, and greater than 1%, preferably greater than 5%, of said total section of said stabilization wall.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=77838650

Family Applications (1)

Country Status (5)

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Family Cites Families (19)

• 2021
  • 2021-09-14 BE BE20215716A patent/BE1029751B1/fr active IP Right Grant
• 2022
  • 2022-09-14 EP EP22789505.9A patent/EP4401855A1/de active Pending
  • 2022-09-14 US US18/690,802 patent/US20250297562A1/en active Pending
  • 2022-09-14 WO PCT/EP2022/075535 patent/WO2023041585A1/fr not_active Ceased
  • 2022-09-14 CN CN202280062207.4A patent/CN118019568A/zh active Pending

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