IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0739754
(2003-12-17)
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발명자
/ 주소 |
- Morgan, Peter L.
- Howe, William J.
- Morris, Mark C.
- Allan, Adrian R.
- Palmer, Donald L.
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출원인 / 주소 |
- Honeywell International Inc.
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인용정보 |
피인용 횟수 :
4 인용 특허 :
8 |
초록
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Cooling air to the blades and disks of a gas turbine may be modulated to provide a variable turbine cooling flow. A bellows may be extended by providing a high pressure compressor discharge flow to an interior of the bellows. The bellows may be compressed when the interior of the bellows communicate
Cooling air to the blades and disks of a gas turbine may be modulated to provide a variable turbine cooling flow. A bellows may be extended by providing a high pressure compressor discharge flow to an interior of the bellows. The bellows may be compressed when the interior of the bellows communicates with ambient pressure air. The extension/compression of the bellows moves an arm over orifices in a cooling air flow path. The pressure inside of the bellows is metered to move the arm over at least one orifice, thereby restricting cooling air flow when the engine is running at low power. The pressure inside of the bellows is metered to move the arm to uncover all of the slots to provide maximum cooling flow when the engine is running at high power. The resulting variable cooling flow system results in less need for cooling air at low powers, thus reducing engine fuel consumption.
대표청구항
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1. A variable flow cooling system comprising:a source of cooling air providing a cooling air flow along a flow path;a flow restriction element in said flow path having at least one orifice or one set of orifices therein;a source of pressurized fluid;a bellows having a single flow line connecting an
1. A variable flow cooling system comprising:a source of cooling air providing a cooling air flow along a flow path;a flow restriction element in said flow path having at least one orifice or one set of orifices therein;a source of pressurized fluid;a bellows having a single flow line connecting an interior of said bellows in the alternative with one of said source of pressurized fluid and with ambient air;an arm moveably attached to said bellows wherein movement of said bellows moves said arm to regulate said cooling air flow.2. The variable flow cooling system according to claim 1, wherein movement of said bellows moves said arm to either an open position, covering none of said orifices, or a closed position, covering at least a portion of said at least one orifice, thereby restricting flow of said coolant fluid through said flow path.3. The variable flow cooling system according to claim 1, wherein said pressurized fluid is compressor discharge air.4. The variable flow cooling system according to claim 1, wherein said at least one orifice or one set of orifice are two orifices or two sets of orifices.5. The variable flow cooling system according to claim 4, wherein movement of said bellows moves said arm to either an open position, covering none of said orifices, or a closed position, covering one of said two orifices or sets of orifices, thereby restricting flow of said cooling fluid through said flow path.6. The variable flow cooling system according to claim 4, further comprising a stop, said arm contacting said stop when said arm is in a closed position, covering one of said two orifices or sets of orifices, said stop preventing said arm from covering the second of said two orifices or sets of orifices.7. The variable flow cooling system according to claim 1, wherein said bellows comprises:a bellows housing, a bellows free end and said arm, said arm connecting said bellows free end to said bellows housing; andsaid arm connected to said bellows free end, thereby moving said arm with said bellows free end.8. The variable flow cooling system according to claim 7, wherein:pressure difference between interior and exterior of bellows provides a force to pull said bellows free end toward said bellows housing when said interior is at ambient pressure;said force moving said arm over at least one of said slots.9. The variable flow cooling system according to claim 7, wherein said spring is resiliently restored when said flow line communicates with said pressurized fluid, thereby moving said arm to uncover said slots.10. The variable flow cooling system according to claim 1, wherein said flow line communicates with said pressurized fluid during a fail mode of said cooling system.11. The variable flow cooling system according to claim 1, further comprising a low friction coating between said arm and a portion of a bellows housing on which said arm moves when said bellows is extended or compressed.12. The variable flow cooling system according to claim 1, further comprising a valve communicating an interior of said bellows with either said pressurized fluid or to ambient air.13. The variable flow cooling system according to claim 1, wherein:said at least two orifices or sets of orifices are at least three orifices or three sets of orifices;said source of pressurized air provides at least a high pressurized fluid source and a low pressurized fluid source;said flow line connecting an interior of said bellows with either said high pressurized fluid source, said low pressurized fluid source or with ambient air via a 3-way valve; andsaid high pressurized fluid source being sufficient to move said arm to said open position, said low pressurized fluid source being sufficient to move said arm to a first closed position, closing at least one of said orifice or set of orifices, and said ambient air being sufficient to move said arm to a second closed position, closing at least one more orifice or set of orifices than said low pressurized fluid source.14. A variable flow cooling system for providing a cooling air flow to components of a gas turbine engine comprising:a source of cooling air providing said cooling air flow along a flow path;a flow restriction element in said flow path having at least two orifices or two sets of orifices therein;a source of pressurized air;a bellows having a single flow line connecting an interior of said bellows in the alternative with one of said source of pressurized fluid and with ambient air;an arm moveably attached to said bellows;a bellows housing, a bellows free end and said arm, each of which, along with at least one bellows spring, define said interior of said bellows;said arm connected to said bellows free end, thereby moving said arm with said bellows free end, wherein movement of said bellows free end moves said arm to either an open position, covering none of said orifices, or a closed position, covering at least one of said orifices, thereby restricting flow of said cooling fluid through said flow path.15. The variable flow cooling system according to claim 14, further comprising a stop, said arm contacting said stop when said arm is in a closed position, covering one of said orifices, said stop preventing said arm from covering all of said orifices.16. The variable flow cooling system according to claim 14, wherein:pressure difference between interior and exterior of bellows provides a force to pull said bellows free end toward said bellows housing when said interior is at ambient pressure;said force moving said arm over at least one of said orifices;said spring is resiliently restored when said flow line communicates with said pressurized fluid, thereby moving said arm to uncover said orifices.17. The variable flow cooling system according to claim 14, wherein said flow line communicates with said pressurized fluid during a fail mode of said cooling system.18. A variable flow cooling system for providing a cooling air to components of a gas turbine engine comprising:a source of cooling air providing said cooling air along a flow path;a flow restriction element in said flow path having two orifices or two sets of orifices therein;a source of pressurized air provided by a turbine engine compressor discharge;a bellows having a single flow line connecting an interior of said bellows in the alternative with one of said source of pressurized fluid and with ambient air;an arm moveably attached to said bellows;a bellows housing, a bellows free end and said arm, and at least one bellows spring, each of which define said interior of said bellows;said arm connected to said bellows free end, thereby moving said arm with said bellows free end, wherein movement of said bellows free end moves said arm to either an open position, covering none of said orifices, or a closed position, covering one of said orifices or sets of orifices, thereby restricting flow of said cooling fluid through said flow path;a stop, said arm contacting said stop when said arm is in a closed position, covering one of said orifice or set of orifices, said stop preventing said arm from covering both of said orifices or sets of orifices; anda low friction coating between said arm and a portion of a bellows housing on which said arm moves when said bellows is extended or compressed, wherein pressure difference between interior and exterior of bellows provides a force to move said bellows free end toward said bellows housing when said interior is at ambient pressure;said force moving said arm over one of said orifices; andsaid spring is restored deformed when said flow line communicates with said pressurized fluid, thereby moving said arm to uncover said orifices.19. A gas turbine engine having variable flow cooling system comprising:a source of cooling fluid providing a cooling fluid flow along a flow path;a flow restriction element in said flow path having at least two orifices or two sets of orifices therein;a source of pressurized fluid;a bellows having a single flow line connecting an interior of said bellows in the alternative with one of said source of pressurized fluid and with ambient air; andan arm moveably attached to said bellows wherein movement of said bellows moves said arm to either an open position, covering none of said orifices, or a closed position, covering at least one of said orifices or one set of orifices, thereby restricting flow of said cooling fluid through said flow path.20. The gas turbine engine according to claim 19, wherein:said pressurized fluid is compressor discharge air; andsaid at least one orifice or one set of orifice are two orifices or two sets of orifices.21. The gas turbine engine according to claim 20, further comprising a stop, said arm contacting said stop when said arm is in a closed position, covering one of said two orifices or two sets of orifices, said stop preventing said arm from covering the second of said two orifices or set of orifices.22. The gas turbine engine according to claim 21, wherein said bellows comprises:a bellows housing, two bellows seals or springs, a bellows free end and said arm, each of which define said interior of said bellows;said arm connected to said bellows free end, thereby moving said arm with said bellows free end.23. The gas turbine engine according to claim 22, wherein:pressure difference between interior and exterior of bellows provides a force on said bellows free end, thereby pulling said bellows free end toward said bellows housing when said interior is at ambient pressure;said force moving said arm over at least one of said orifice or set of orifices; andsaid spring is resiliently restored when said flow line communicates with said pressurized fluid, thereby moving said arm to uncover said orifices.24. The gas turbine engine according to claim 23, wherein said flow line communicates with said pressurized fluid during a fail mode of said cooling system, thereby placing said cooling system in an open position.25. A method for modulating cooling flow to a turbine, comprising:providing said cooling flow along a flow path;disposing a flow restriction element in said flow path having at least two orifices or two sets of orifices therein;connecting an interior of a bellows in the alternative with one of a source of pressurized fluid and with ambient air;defining said interior of said bellows by a bellows housing, at least two bellows spring or seals, a bellows free end and an arm;movably connecting said arm to said bellows free end, thereby allowing movement of said arm with movement of said bellows free end, wherein movement of said bellows free end moves said arm to either an open position, covering none of said orifices, or a closed position, covering at least one of said orifices or sets of orifices, thereby restricting flow of said cooling fluid through said flow path.26. The method according to claim 25, further comprising:preventing said arm from covering all of said orifices by providing a stop, wherein said arm contacts said stop when said arm is in a closed position, covering at least one of said orifice or set of orifices.27. The method according to claim 25, further comprising communicating said flow line with said pressurized air during a fail mode of said cooling system.
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