Bearing cooling control in an air cycle machine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01D-003/00
F04D-029/057
F04D-029/58
출원번호
US-0974529
(2010-12-21)
등록번호
US-8905707
(2014-12-09)
발명자
/ 주소
Colson, Darryl A.
Rosen, Seth E.
Chrabascz, Eric
출원인 / 주소
Hamilton Sundstrand Corporation
대리인 / 주소
Carlson, Gaskey & Olds, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
An air cycle machine has a housing which holds a compressor section, and a turbine section having an expansion area, and a fan section disposed outside of the housing. A shaft, which attaches to and is coaxial with the compressor section, the turbine section and the fan section, is supported by an a
An air cycle machine has a housing which holds a compressor section, and a turbine section having an expansion area, and a fan section disposed outside of the housing. A shaft, which attaches to and is coaxial with the compressor section, the turbine section and the fan section, is supported by an air journal bearing and an air thrust bearing. The shaft has a hollow core for porting cooling air from the air journal bearing and the air thrust bearing, and a tube that extends into said expansion area and communicates cooling air from the turbine expansion area to the thrust bearing.
대표청구항▼
1. An air cycle machine comprising: a housing,a compressor section disposed within said housing,a turbine section disposed within said housing and having an expansion area,a fan section disposed outside of said housing,a shaft attaching to and coaxial with said compressor section, said turbine secti
1. An air cycle machine comprising: a housing,a compressor section disposed within said housing,a turbine section disposed within said housing and having an expansion area,a fan section disposed outside of said housing,a shaft attaching to and coaxial with said compressor section, said turbine section and said fan section, said fan supported by an air journal bearing and an air thrust bearing, said shaft having a hollow core for porting cooling air from said air journal bearing and said air thrust bearing, said shaft having, on an aft portion thereof, a first opening and a second opening for porting cooling air into the hollow core and,a tube that extends into said expansion area and communicates cooling air from said expansion area to said air thrust bearing and said air journal bearing. 2. The air cycle machine of claim 1 wherein said tube further comprises: a curved tube, which has a length along a curving central axis and a width along said curving central axis wherein said curving central axis is curved at a radius R of 1.3±0.1 cm along an upper portion thereof and wherein a ratio of the length to width of the tube is from 1.456-1.657:1. 3. The air cycle machine of claim 1 wherein said shaft further comprises: a body,a forward flange extending radially from said body, said forward flange having a first plurality of teeth radially extending and disposed thereon for cooperating with a seal,said first opening communicating with the hollow core of said body,a tooth in close proximity to and aft of said first opening, said tooth creating a barrier to air passing along said shaft and urging the air into the first opening,said second opening aft of said tooth and said first opening, anda second plurality of teeth aft of said tooth, said second opening and said first opening wherein said second plurality of teeth creates a barrier to air passing along said shaft by said tooth and urging the air into the first opening. 4. The air cycle machine of claim 3 wherein a ratio of the tooth to the number of the second plurality of teeth is 5:1 and a ratio of the first plurality of teeth to the second plurality of teeth is 3:5. 5. The air cycle machine of claim 3 wherein each of said first plurality of teeth is about 0.114 cm high and has a flattened upper portion that is about 0.25 cm wide. 6. The air cycle machine of claim 3 wherein each of said second plurality of teeth is 0.114 cm high and has a flattened upper portion in that is 0.025 cm wide. 7. The air cycle machine of claim 1 further comprising: a first seal having a flat outer portion, a pair of parallel sides said sides being attached to a flat inner portion that is parallel to said outer portion between said flat inner portion and said flat outer portion, said first seal having a thickness and an inner diameter, anda forward cylindrical pilot disposed in said air cycle machine said housing having a flat area for receiving said flat outer portion of said first seal, said forward pilot having an inner diameter wherein a ratio of the forward pilot inner diameter to the thickness of said first seal is 20.09-15.05:1 andan aft pilot having a second seal having a flat outer portion having a first width, a first side wall attaching to a first side of flat inner portion via a first angled wall, said flat inner portion having a second width wider than said first width, a second side wall extending radially outwardly from a second side of said inner portion via a second angled wall, an extension attaching to said second side wall and extending axially toward said first side wall and a radiused portion extending from said extension and attaching to said flat outer portion, said second seal having a thickness, said second seal having an inner diameter. 8. The air cycle machine of claim 7 wherein the internal diameter of the first seal to the internal diameter of the second seal is from 1.665-1.668:1. 9. A forward bearing assembly for an air cycle machine, said bearing assembly comprising: a seal having a flat outer portion, a pair of parallel sides, each of said sides being attached to a flat inner portion by an angled side, the flat inner portion being parallel to said outer portion between said flat inner portion and said flat outer portion, said seal having a thickness, anda cylindrical pilot disposed in an air cycle machine housing, said pilot having a flat area for receiving said flat outer portion of said seal, said pilot having an inner diameter wherein a ratio of the forward pilot inner diameter to the thickness of the seal is 20.09-15.05:1. 10. The bearing assembly of claim 9 wherein said seal is made of a graphite-infused polyimide material and said seal partially covers a half teardrop-shaped cut-out on an axial edge of said pilot. 11. The bearing assembly off claim 9 wherein said angled sides are angled towards each other at 40° from a central axis. 12. The bearing assembly of claim 9 wherein a ratio between a seal internal diameter and a seal outer diameter is 1.074-1.072:1. 13. An aft bearing assembly for an air cycle machine, said bearing assembly comprising: a seal having a flat outer portion having a first width, a first side wall attaching to a first side of flat inner portion via a first angled wall, said flat inner portion having a second width wider than said first width, a second side wall extending radially outwardly from a second side of said inner portion via a second angled wall, an extension attaching to said second side wall and extending axially toward said first side wall and a radiused portion extending from said extension and attaching to said flat outer portion, said seal having a thickness, anda cylindrical pilot disposed in an air cycle machine housing said pilot having a flat area for receiving said flat outer portion of said seal, said pilot having an inner diameter wherein a ratio of the cylindrical pilot inner diameter to the thickness of the seal is 10.33-8.03:1. 14. The bearing assembly of claim 13 wherein said seal is made of a graphite-infused polyimide material and said seal partially covers a half teardrop-shaped cut-out on an axial edge of said pilot. 15. The bearing assembly off claim 13 wherein said angled walls are angled towards each other at 40° from a central axis. 16. A shaft for an air cycle machine, said shaft comprising: a hollow body,a forward flange extending radially from said hollow body, said forward flange having a first plurality of teeth radially extending teeth disposed thereon for cooperating with a seal,a first opening communicating with an interior of said body,a tooth in close proximity to and aft of said first opening, said tooth creating a barrier to air passing along said shaft and urging the air into the first opening,a second opening aft of said tooth and said first opening, anda second plurality of teeth aft of said tooth, said second opening and said first opening wherein said second plurality of teeth creates a barrier to air passing along said shaft by said tooth and urging the air into the first opening. 17. The shaft of claim 15 wherein a ratio of the tooth to the number of the second plurality of teeth is 5:1 and a ratio of the first plurality of teeth to the second plurality of teeth is 3:5. 18. The shaft of claim 16 wherein each of said first and said second plurality of teeth is 0.114 cm. high and has a flattened area that is 0.025 cm. wide at a top thereof. 19. A turbine housing for an air cycle machine comprises: an outer shell housing a turbine section, andan inner shell housing a hollow shaft, and defining an expansion area between said inner and outer shell, said inner shell having a forward pilot having a first inner diameter and an aft pilot having a second inner diameter wherein the ratio between the inner diameter of the forward pilot and the inner diameter of the aft pilot is 1.668-1.664:1. 20. The turbine housing of claim 19 further comprising a first bore drilled into a bottom thereof and communicating said turbine expansion area, said first bore being disposed at angle of 15° relative to an axis passing through said housing. 21. The turbine housing of claim 20 further comprising a second bore drilled in said turbine housing that is drilled at angle of 15° relative to said axis and 30° relative to the first bore, said first bore and said second bore intersecting each other. 22. A method of installing a seal into an air cycle machine comprising: providing a first seal having an outer diameter and a thickness configured to engage a rotating surface wherein a ratio between said outer diameter and said thickness is 20.09-15.05:1, andproviding a housing having a first pilot having an inner diameter, andpressing said first seal into said first pilot. 23. The method of claim 22 further comprising: providing a shaft having a plurality of teeth disposed thereupon, andinserting a shaft along an axis within said first seal and said first pilot. 24. The method according to claim 23, comprising the step of axially aligning a first plurality of teeth on the shaft with said first seal to provide a radial clearance between said seal and said first plurality of teeth is nominally about 0.015 cm. 25. The method of claim 22 further comprising the steps of: providing a second seal having an outer diameter and a thickness configured to engage a rotating surface wherein a ratio between said outer diameter and said thickness is 10.33-8.03:1,providing a second pilot having an inner diameter, andpressing said second seal into said first pilot wherein a ratio between said inner diameter of said first pilot and said inner diameter of said second pilot is 1.665-1.668:1. 26. The method of claim 25 further comprising: machining a cut-out at either end of said second pilot. 27. The method of claim 22 further comprising: providing a shaft having a first plurality of teeth disposed and a second plurality of teeth thereupon, andinserting a shaft along an axis within said first seal and said first pilot. 28. The method according to claim 27, comprising the step of: axially aligning said second plurality of teeth on the shaft with a second seal and,providing a radial clearance between the second seal and the second plurality of teeth of nominally about 0.015 cm. 29. The method of claim 22 further comprising: machining a cut-out at either end of said first pilot.
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이 특허에 인용된 특허 (10)
Dziorny Paul J. (Manchester CT) McAuliffe Christopher (Windsor CT), Air cycle machine alignment.
Dziorny Paul J. (132 Strawberry La. Manchester CT 06040) McAuliffe Christopher (18 Kellogg St. Windsor CT 06095), Air cycle machine with interstage venting.
Maher ; Jr. John F. (Enfield CT) Merritt Brent J. (Westfield MA) McAuliffe Christopher (Windsor CT) Dziorny Paul J. (Manchester CT), Four wheel air cycle machine.
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