GB2494193A - Fluid separation - Google Patents

Fluid separation Download PDF

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Publication number
GB2494193A
GB2494193A GB1115252.7A GB201115252A GB2494193A GB 2494193 A GB2494193 A GB 2494193A GB 201115252 A GB201115252 A GB 201115252A GB 2494193 A GB2494193 A GB 2494193A
Authority
GB
United Kingdom
Prior art keywords
air
filter element
text
oil
oil separator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1115252.7A
Other versions
GB201115252D0 (en
Inventor
John Stephen Askins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolls Royce PLC filed Critical Rolls Royce PLC
Priority to GB1115252.7A priority Critical patent/GB2494193A/en
Publication of GB201115252D0 publication Critical patent/GB201115252D0/en
Publication of GB2494193A publication Critical patent/GB2494193A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/14—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by rotating vanes, discs, drums or brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0052—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with filtering elements moving during filtering operation
    • B01D46/0056—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with filtering elements moving during filtering operation with rotational movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/26—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies rotatable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/18—Lubricating arrangements

Landscapes

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

Abstract

An air-oil separator 100 adapted to separate oil and air, the air-oil separator comprises a rotatable drum 116 arranged to receive a flow of air-oil mixture and induce a circumferential flow for the mixture, the drum further being arranged to receive oil particles on an inner surface of the drum to separate oil from the air by virtue of centrifugal force; a first filter element 121 arranged in the rotatable drum and configured to filter out oil droplets; and a second filter element 128, the second filter element being arranged downstream of at least a portion of the first filter element with respect to the flow of air through the separator; wherein the second filter element is configured to filter out smaller oil droplets from the air than the first filter element. Advantageously the air-oil separator is used to separate oil and air vented from the bearing chambers and oil tank of a gas turbine engine, particularly gas turbine aero-engines.

Description

AN AIR-OIL SEPARATOR
The present disclosure relates to an air-oil separator and particularly but not exclusively relates to an air-oil separator for a gas turbine engine.
Background
Rotating air-oil separators, often referred to as breathers, are commonly used on gas turbines, in particular gas turbine aero-engines. For example, air vented from the bearing chambers and oil tank of a gas turbine engine inevitably includes entrained oil and the function of the air-oil separator is to separate the oil from the air. The oil may then be scavenged, e.g. recycled, back to the oil tank, before the air may be released overboard.
By way of example, Figure 1 shows a previously-proposed air-oil separator 10. As depicted, the air-oil mixture enters a housing 12 via an inlet 14. Within the housing 12 there is provided a rotatable drum 16 which comprises an inlet 18 and outlet 20. The drum 16 is arranged to rotate within the housing 12 and about a longitudinal axis 17 of the drum. The drum inlet 18 is disposed within the housing 12 and receives the air-oil mixture flow. The drum inlet 18 is ring shaped in cross-section and is centred on the longitudinal axis 17 of the rotatable drum. As a result, the air-oil mixture enters the drum ata radial location spaced apart from the longitudinal axis 17. By contrast, the drum outlet 20 is substantially circular in cross-section and is centred on the longitudinal axis 17.
A metal foam element 21 is also provided within the drum 16 at the inlet 18. The metal foam element is ring shaped to correspond to the shape of the inlet 18. The metal foam element provides a tortuous path for the oil particles. Oil particles may collect on surfaces within the metal foam element and, as the drum rotates, the oil is centrifuged to the radially outer surfaces of the foam element. An opening 22 in a radially outer wall of the drum 16 is arranged adjacent to the exit of the metal foam element 21. The centrifugal force caused by the rotation of the drum results in the oil collected in the foam element 21 being expelled through the opening 22 and into the housing 12.
Furthermore, the air-oil mixture enters the drum 16 and flows through the foam element 21 substantially in a first axial direction and the drum 16 is shaped to turn the flow so that the air leaves the drum flowing in a second axial direction apposite to the first axial direction. This turning of the flow encourages the heavier oil particles to collect on the drum wall, since they have a higher inertia and are less able to follow the turning flow.
In addition, the rotation of the drum imparts a circumferential velocity to the air-oil mixture thereby centrifuging the heavier oil particles to the outer wall of the drum 16.
Thus oil particles remaining in the air after passing through the foam element 21 collect on the surface of the drum and are expelled via the opening 22 in the outer wall of the drum. The expelled oil collects in the housing 12 and is scavenged to the oil system via housing oil outlet 24. The remaining air passes through the drum 16 and exits via outlet 20, which in the case of an aero-engine may be emitted overboard.
Air-oil separators, such as the type shown in Figure 1, are typically very effective. For example, in the case of a gas turbine engine, an air-oil separator may limit oil consumption to under 0.568 litres (0.5 quarts) per hour, and the consumption may even be as low as 0.114 litres (0.1 quarts) per hour. In the case of a gas turbine aero-engine it is clearly advantageous to minimise oil consumption as this reduces the oil reserves required and hence the aircraft take-off weight.
However, on some gas turbine aero-engines, there may be a noticeable plume of "smoke" from the air-oil separator overboard mast over a range of operating conditions.
This "smoke" has been attributed to very small oil droplets suspended in the air. These oil droplets appear to pass through the air-oil separator without being removed from the mixture.
The present disclosure therefore seeks to address this issue.
Statements of Invention
According to a first aspect of the present invention there is provided an air-oil separator adapted to separate oil and air, the air-oil separator comprising: a rotatable drum arranged to receive a flow of air-oil mixture and induce a circumferential flow for the mixture, the drum further being arranged to receive oil particles on an inner surface of the drum to separate oil from the air by virtue of centrifugal force; a first filter element arranged in the rotatable drum and configured to filter out oil droplets; and a second filter element, the second filter element being arranged downstream of at least a portion of the first filter element with respect to the flow of air through the separator; wherein the second filter element is configured to filter out smaller oil droplets from the air than the first filter element.
The second filter element may be configured to filter out, e.g. block the passage of, oil droplets from the air greater than approximately 3 micrometers in diameter. The second filter element may be configured to filter out oil droplets from the air less than approximately 10 micrometers in diameter.
The second filter element may be arranged in the rotatable drum. The second filter element may be arranged between layers of the first filter element. The air-oil separator may further comprise a backing structure, which may be arranged to at least partially encapsulate the second filter element. The backing structure may be configured to protect the second filter element from the centrifugal forces within the
rotatable drum.
The second filter element may be arranged outside the rotatable drum. A passage may be provided between the second filter element and the remainder of the air-oil separator. The passage may be arranged such that oil collected in the second filter element flows down the passage to the remainder of the air-oil separator, e.g. by virtue of gravity.
The second filter element may comprise a replaceable cartridge.
The drum may comprise a ring shaped inlet disposed about and centred on a longitudinal axis of the drum. The incoming flow may enter the drum at a radial location spaced apart from the longitudinal axis. The drum may be configured to redirect the flow such that an axial component of the flow velocity reverses direction. The flow may exit the drum through a central passage, for example which may pass through the centre of the ring shaped inlet.
The first filter element may comprise a ring disposed at the drum inlet. The second filter element may be in the central passage of the drum. The second filter element may be substantially cylindrical in shape. The second filter element may be arranged within the rotatable drum such that a radially outer surface of the second filter element may be exposed to incoming air-oil mixture. The second filter element may be arranged within the rotatable drum such that the air may exit through an end face of the second filter element.
The second filter element may be arranged such that it is self cleaning, for example by virtue of centrifugal force and/or gravity.
The first filter element may be configured to filter out oil droplets greater than 10 micrometers in diameter. The first filter element may comprise a foam element, for example, the first filter element may be a metal foam element.
A gas turbine engine may comprise the aforementioned air-oil separator.
Brief Description of the Drawings
For a better understanding of the present disclosure, and to show more clearly how it may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which:-Figure 1 shows a previously-proposed air-oil separator; Figure 2 shows an air-oil separator according to an example of the present disclosure; and Figure 3 shows first and second filter elements of an air-oil separator according to a
further example of the present disclosure.
Detailed Description
With reference to Figure 2, an air-oil separator 100 according to an example of the present disclosure comprises a housing 112 and a rotatable drum 116 provided therein.
As such, the air-oil separator 100 of the present disclosure is similar to the previously-proposed air-oil separator described above. Accordingly, the air-oil mixture enters the housing 112 via a housing inlet 114, enters the drum via drum inlet 118 and the air exits via drum outlet 120.
The drum 116 is arranged to rotate within the housing 112 and about a longitudinal axis 117 of the drum. The drum inlet 118 is disposed within the housing 112 and receives the air-oil mixture flow. The drum inlet 118 is annular, e.g. ring shaped, in cross-section and is centred on the longitudinal axis 117 of the rotatable drum. As a result, the air-oil mixture enters the drum at a radial location spaced apart from the longitudinal axis 117.
By contrast, the outlet 120 is substantially circular in cross-section and is centred on the longitudinal axis 117.
A first filter element 121 is provided within the drum 116 at the inlet 118. The first filter element 121 is annular, e.g. ring or disc shaped, and corresponds to the shape of the inlet 118. The first filter element may comprise a foam, e.g. a metal foam. The first filter element 121 provides a tortuous flow path for the oil particles, e.g. droplets, and the oil particles may collect on surfaces within the first filter element. As the drum 116 rotates, the oil is centrifuged to the radially outer surfaces of the first filter element 121.
An opening 122 in a radially outer wall of the drum 116 is arranged adjacent to the first filter element 121. The opening 122 may be provided at or towards a downstream end of the first filter element 121. The centrifugal force caused by the rotation of the drum 116 results in the oil collected in the first filter element 121 being expelled through the opening 122 and into the housing 112. The expelled oil collects in the housing 112 and is scavenged to the oil system via housing oil outlet 124. The remaining air passes through the drum 116 and exits via outlet 120, which in the case of an aero-engine may be emitted overboard. A gauze 126, e.g. a coarse wire mesh, may be provided at the outlet 120 to prevent the unwanted discharge of any large particles.
In addition to the first filter element 121, further oil particles may be removed by virtue of the oil droplets inertia. For example, the air-oil mixture enters the drum 116 and flows through the first filter element 121 substantially in a first axial direction 131 and the drum 116 is shaped to turn the flow so that the air leaves the drum flowing in a second axial direction 132 opposite to the first axial direction. This turning of the flow encourages the heavier oil particles to collect on the drum wall, since they have a higher inertia and are less able to follow the turning flow. In addition, the rotation of the drum imparts a circumferential velocity to the air-oil mixture thereby centrifuging the heavier oil particles to the outer wall of the drum 116. In either case, the oil particles collect on the surface of the drum 116 and, as mentioned above, are expelled via the opening 122 in the outer wall of the drum and then to the housing oil outlet 124.
In addition to the first filter element 121, the air-oil separator comprises a second filter element 128. The second filter element 128 is arranged downstream of the first filter element 121 with respect to the flow of air through the separator 100. The second filter element 128 is configured to filter out smaller oil droplets from the air than the first filter element 121. Accordingly, the second filter element 128 may comprise a fine filter media, which is fine with respect to the coarser first filter element 121.
The second filter element 128 may comprise a micro-porous membrane. The second filter element may be configured to filter out oil droplets from the air greater than approximately 3 micrometers (e.g. microns) in diameter. As such, the second filter element may have pores which are sized to remove oil particles greater than approximately 3 micrometers in diameter, for example the pores may be approximately 3 micrometers in diameter. A filter element with such sized pores may be optimal since laboratory experiments have shown that 3 micron media remove most of the visible "smoke" from an airstream. A filter with smaller pores may present a greater pressure loss without removing significantly more oil particles.
As depicted in Figure 2, the second filter element 128 may be arranged in the rotatable drum 116. The second filter element may be in the central passage, e.g. the bore, of the drum. The second filter element 128 may be substantially cylindrical in shape. The second filter element 128 may be arranged within the rotatable drum 116 such that a radially outer surface 1 28a of the second filter element 128 may be exposed to incoming air-oil mixture. The second filter element 128 may be arranged within the rotatable drum 116 such that the air may exit through an end face 128b of the second filter element.
The air-oil separator 100 may further comprise a backing structure (not shown), which may be arranged to at east partially encapsulate the second filter element 128. The backing structure may be configured to protect the second filter element 128 from the centrifugal forces within the rotatable drum. The backing structure may comprise a wire mesh, which may be sufficiently coarse to allow the free passage of the oil-air mixture into the second filter element.
In the configuration shown in Figure 2, the second filter element 128 is downstream of the first filter element 121 and the flow turning within the drum rotor. As a result, most (e.g. approximately more than 99%) of the oil has been removed from the air by the time it reaches the second filter element 128. Therefore, the second filter element will see relatively clean air, which will reduce the pressure drop across it and hence the air-oil separator. Any oil collected in the second filter element 128 would be centrifuged out and collected via the existing separator scavenge route (e.g. the opening 122 and outlet 124). An additional benefit is that, as the flow through the second filter element 128 is from outside to inside and any debris will stick to the outside of the filter, the second filter element will be self-cleaning thanks to the centrifugal force tending to remove such debris.
With reference to Figure 3, in a further example of the present disclosure, the second filter element 228 may be provided between layers of the first filter element 221. The first filter element 221 may comprise one or more layers, and as depicted, the first filter element 221 may comprise three layers. Figure 3 is a sectional view of half of the first filter element 221 and as such only one side of the first filter element 221 with respect to the longitudinal axis 217 of the drum is shown. As for the first filter element 121, the layers of the first filter element may be annular, e.g. ring or disc shaped.
A first layer 221 a of the first filter element 221 may comprise a fine filter which removes most of the oil from the incoming air 231. Second and third layers 221b, 221c, which may be arranged downstream of the first layer 221a and with the third layer downstream of the second layer, may comprise a coarse filter, which is coarser than the first layer filter 21 2a. In other words, a fine grade filter (e.g. with smaller holes or pores than the second and third filter layers) may be provided upstream and one or more further filters with a coarser grade may be provided behind the fine grade filter.
One or more of the first filter element layers may comprise a foam type filter, e.g. a metallic type foam filter.
As depicted in Figure 3, the second filter element 228 may alternatively be provided downstream of the first layer 221 a, for example the second filter element 228 may be provided between the first and second layers 221 a, 221 b. As for the example shown in Figure 2, the second filter element 228 is configured to filter out smaller oil droplets from the air than the first filter element 221, in particular the first layer 221a. Most of the air-oil separation is thought to take place in the first millimetre or so (in the axial direction) of the first layer 221 a. Therefore, sandwiching the second filter element 228 between the first and second layers 221a, 221b places the second filter element in a similar downstream position in the system to the example shown in Figure 2. Like the second filter element 128 shown in Figure 2, the second filer element 228 shown in Figure 3 may also be self-cleaning.
In a further example of the present disclosure (not shown), the second filter element may be provided outside of the rotatable drum. For example, the second filter element may be provided at the housing air outlet. As such, the second filter element may be static, e.g. it may not rotate with the drum. A passage may be provided between the second filter element and the remainder of the air-oil separator. The passage may be arranged such that oil collected in the second filter element flows down the passage to the remainder of the air-oil separator by virtue of gravity. This would ensure that if the fine drops coalesced into larger drops on the membrane of the second filter element, then these would run downhill, back to the separator, and be recycled in the manner described above. The second filter element may therefore be self-cleaning.
With any of the above examples of the present disclosure, the first and/or second filter elements may comprise a replaceable cartridge. As such, the filter cartridge could be removed and replaced with a new one. This may be carried out at a particular time interval or, in the case of a gas turbine engine, this may be done each time the engine is inspected with a borescope. The cartridge may be arranged to allow quick and easy removal and insertion. Furthermore, the aforementioned examples of the present disclosure may be retro-fitted to existing air-oil separators, e.g. on existing gas turbine engines.
The air-oil separator of the present disclosure advantageously filters out oil droplets less than 10 micrometers in diameter and it is currently understood that such droplets cause the "smoke" referred to above. A "smoke-free" air-oil separator is therefore provided. Due to the volume of oil in the vent flow, it would not be practical to have a fine filter upstream of the drum rotor, because it would have to be large to avoid a high pressure drop. It would also need a dedicated scavenge element to remove all the oil collected. By contrast, the second filter element of the present disclosure may be -10-placed downstream of the first filter element and does not present a large pressure drop to the flow. The present disclosure advantageously combines the bulk separation capability of a rotating metal foam breather with the fine particle separation capability of a fine filter, and removes the need for a separate scavenge element for the fine filter. -11 -

Claims (1)

  1. <claim-text>CLAIMS1 An air-oil separator adapted to separate oil and air, the air-oil separator comprising: a rotatable drum arranged to receive a flow of air-oil mixture and induce a circumferential flow for the mixture, the drum further being arranged to receive oil particles on an inner surface of the drum to separate oil from the air by virtue of centrifugal force; a first filter element arranged in the rotatable drum and configured to filter out oil droplets; and a second filter element, the second filter element being arranged downstream of at least a portion of the first filter element with respect to the flow of air through the separator; wherein the second filter element is configured to filter out smaller oil droplets from the air than the first filter element.</claim-text> <claim-text>2 The air-oil separator of claim 1, wherein the second filter element is configured to filter out oil droplets from the air greater than approximately 3 micrometers in diameter.</claim-text> <claim-text>3 The air-oil separator of claim 1 or 2, wherein the second filter element is configured to filter out oil droplets from the air less than approximately 10 micrometers in diameter.</claim-text> <claim-text>4 The air-oil separator of any of claims 1 to 3, wherein the second filter element is arranged outside the rotatable drum. -12-</claim-text> <claim-text>The air-oil separator of claim 4, wherein the air-oil separator further comprises a passage provided between the second filter element and the remainder of the air-oil separator, the passage being arranged such that oil collected in the second filter element flows down the passage to the remainder of the air-oil separator.</claim-text> <claim-text>6 The air-oil separator of any of claims 1 to 3, wherein the second filter element is arranged in the rotatable drum.</claim-text> <claim-text>7 The air-oil separator of claim 6, wherein the second filter element is arranged between layers of the first filter element.</claim-text> <claim-text>8 The air-oil separator of any preceding claim, wherein the air-oil separatorfurther comprises a backing structure arranged to at east partially encapsulate the second filter element.</claim-text> <claim-text>9 The air-oil separator of any preceding claim, wherein the second filter element comprises a replaceable cartridge.</claim-text> <claim-text>10 The air-oil separator of any preceding claim, wherein the first filter element is ring shaped and is disposed at an inlet to the drum.</claim-text> <claim-text>11 The air-oil separator of any preceding claim, wherein the second filter element is disposed in a central passage of the drum.</claim-text> <claim-text>12 The air-oil separator of any preceding claim, wherein the second filter element is substantially cylindrical in shape.</claim-text> <claim-text>13 The air-oil separator of claim 12, wherein the second filter element is arranged within the rotatable drum such that a radially outer surface of the second filter element is exposed to incoming air-oil mixture. -13-</claim-text> <claim-text>14 The air-oil separator of claim 12 or 13, wherein the second filter element is arranged within the rotatable drum such that the air exits through an end face of the second filter element.</claim-text> <claim-text>15 The air-oil separator of any preceding claim, wherein the second filter element is arranged such that it is self cleaning by virtue of centrifugal force and/or gravity.</claim-text> <claim-text>16 The air-oil separator of any preceding claim, wherein the first filter element is configured to filter out oil droplets greater than 10 micrometers in diameter.</claim-text> <claim-text>17 A gas turbine engine comprising the air-oil separator according to any of the preceding claims.</claim-text> <claim-text>18 An air-oil separator substantially as described herein, with reference to and as shown in Figures 2 to 3.</claim-text>
GB1115252.7A 2011-09-05 2011-09-05 Fluid separation Withdrawn GB2494193A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1115252.7A GB2494193A (en) 2011-09-05 2011-09-05 Fluid separation

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Application Number Priority Date Filing Date Title
GB1115252.7A GB2494193A (en) 2011-09-05 2011-09-05 Fluid separation

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GB2494193A true GB2494193A (en) 2013-03-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10918989B2 (en) 2018-04-10 2021-02-16 Pratt & Whitney Canada Corp. Air-oil separator with two flow paths

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112392563B (en) * 2020-11-16 2022-11-29 四川航天中天动力装备有限责任公司 High-rotating-speed oil-gas separator for turbine engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1361712A (en) * 1972-04-06 1974-07-30 Advanced Prod Eng Corp Filtration apparatus
US4714139A (en) * 1985-10-02 1987-12-22 Mtu Motoren-Und Turbinen Union Muenchen Gmbh Lubricating system for gas turbine engines and pump for such a system
US6033450A (en) * 1995-12-21 2000-03-07 United Technologies Corporation Deoiler shaft vortex separator
KR20100003987U (en) * 2008-10-07 2010-04-15 김성수 Apparatus for collecting oil mist

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1361712A (en) * 1972-04-06 1974-07-30 Advanced Prod Eng Corp Filtration apparatus
US4714139A (en) * 1985-10-02 1987-12-22 Mtu Motoren-Und Turbinen Union Muenchen Gmbh Lubricating system for gas turbine engines and pump for such a system
US6033450A (en) * 1995-12-21 2000-03-07 United Technologies Corporation Deoiler shaft vortex separator
KR20100003987U (en) * 2008-10-07 2010-04-15 김성수 Apparatus for collecting oil mist

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10918989B2 (en) 2018-04-10 2021-02-16 Pratt & Whitney Canada Corp. Air-oil separator with two flow paths

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GB201115252D0 (en) 2011-10-19

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