IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0360976
(2003-02-07)
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발명자
/ 주소 |
- Wernberg, Donald E.
- Tysver, John D.
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출원인 / 주소 |
- Woodward Governor Company
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
18 인용 특허 :
6 |
초록
▼
A fuel system having an ecology valve controlling liquid flow through a retention passage when pressurized liquid is passed through the valve is presented. The retention passage winds between the valve outlet and a cavity such that no matter which way the valve is oriented gravity alone is unable to
A fuel system having an ecology valve controlling liquid flow through a retention passage when pressurized liquid is passed through the valve is presented. The retention passage winds between the valve outlet and a cavity such that no matter which way the valve is oriented gravity alone is unable to drain liquid from the cavity to the outlet. The ecology valve serves to suction fuel from fuel nozzle passages upon engine shutdown. Fuel is temporarily stored in the cavity and the retention passage. The ecology valve also provides a fuel splitting function for providing a port geometry determined split between fuel nozzles in the fuel system.
대표청구항
▼
1. A valve having a housing, the valve controlling liquid flow through a retention passage when pressurized liquid is passed through the valve, said retention passage including an inlet and an outlet and located within the housing, the retention passage winding between the inlet and the outlet such
1. A valve having a housing, the valve controlling liquid flow through a retention passage when pressurized liquid is passed through the valve, said retention passage including an inlet and an outlet and located within the housing, the retention passage winding between the inlet and the outlet such that no matter which way the valve is oriented gravity alone is unable to drain liquid from the inlet to the outlet or from the outlet to the inlet.2. The valve of claim 1 wherein the retention passage includes a groove formed into a cylindrical structure, further comprising a sleeve inserted into the structure enclosing the retention passage.3. The valve of claim 2 wherein the retention passage includes a spiral section winding axially about an axis between first and second spiral end portions and a nozzle passage section connected to the first spiral end portion extending axially toward said second spiral end portion to prevent drainage.4. The valve of claim 1 wherein the valve further comprises a valve member movable in the housing, the housing comprising an outer body and a sleeve, wherein a portion of the retention passage is disposed between the outer body and the sleeve.5. The valve of claim 4 wherein the valve housing has at least one cavity connected to the retention passage and the valve member is movable in the at least one cavity.6. A valve comprising a valve housing having at least one cavity connected to a retention passage and a valve member movable in the at least one cavity of the valve housing, the valve housing comprising an outer body and a sleeve, a portion of the retention passage being disposed between the outer body and the sleeve, the valve controlling liquid flow through a retention passage when pressurized liquid is passed through the valve, the retention passage including an inlet and an outlet and a nozzle passage section, the retention passage winding between the inlet and the outlet such that no matter which way the valve is oriented gravity alone is unable to drain liquid from the inlet to the outlet or from the outlet to the inlet and the at least one cavity is sized such that fluid in the nozzle passage section is pulled into the at least one cavity when the valve member moves from a first position to a second position.7. The valve of claim 6 wherein the retention passage further includes a spiral section winding axially about an axis between first and second spiral end portions and the nozzle passage section is connected to the first spiral end portion extending axially toward said second spiral end portion to prevent drainage.8. The valve of claim 7 wherein the second spiral end portion is connected to the at least one cavity.9. A valve comprising a valve housing and a plurality of valve members movable in the valve housing, the valve housing comprising an outer body and a sleeve, the valve controlling liquid flow through a retention passage when pressurized liquid is passed through the valve, said retention passage including an inlet and an outlet, the retention passage winding between the inlet and the outlet such that no matter which way the valve is oriented gravity alone is unable to drain liquid from the inlet to the outlet or from the outlet to the inlet, wherein a portion of the retention passage is disposed between the outer body and the sleeve.10. The valve of claim 9 wherein the retention passage comprises a plurality of retention passages, the valve housing has a plurality of cavities connected to the plurality of retention passages and the plurality of valve members are movable in the plurality of cavities.11. The valve of claim 10 wherein each of the plurality of retention passages includes a nozzle passage section and the plurality of cavities are sized such that fluid in the nozzle passage section is pulled into the plurality of cavities when the valve member moves from a first position to a second position.12. The valve of claim 11 wherein the plurality of retention passages further includes a spiral section winding axially about an axis between first and second spiral end portions and the nozzle passage section is connected to the first spiral end portion extending axially toward said second spiral end portion to prevent drainage.13. The valve of claim 12 wherein the second spiral end portion is connected to one of the plurality of cavities.14. The valve of claim 10 wherein the plurality of retention passages comprises a primary retention passage connected to a primary fuel nozzle passage and a first cavity of the plurality of cavities and a secondary retention passage connected to a secondary fuel nozzle passage and a second cavity of the plurality of cavities and wherein the secondary retention passage is kept dry until a time when flow is required in the secondary fuel nozzle passage.15. The valve of claim 11 wherein the valve is locatable at any location around the circumference of an engine combustion chamber.16. An ecology valve for supplying pressurized fuel from an engine fuel manifold to at least one nozzle passage of an engine during engine operation and for withdrawing fuel from the at least one nozzle passage during shut-down of the engine comprising:a valve housing including an inlet port adapted to be coupled to a fuel flow of the engine fuel manifold, an outlet port adapted to be coupled to the nozzle passage, a cavity for temporary storage of fuel, and a retention passage adapted to be connected to the cavity and the outlet port, the retention passage winding between the cavity and the outlet port such that no matter which way the ecology valve is oriented gravity alone is unable to drain liquid from the inlet port to the outlet port or from the outlet port to the inlet port; and a movable piston supported within the valve housing for reciprocable motion along an axis and whose position is controlled by fuel pressure, the piston having a first position allowing maximum flow of fuel from the inlet port to the outlet port, and a second position substantially blocking any fuel flow from the inlet port to the outlet port, the piston responding to high fuel pressure at the inlet port to move toward the first position and responding to lower fuel pressure to move toward the second position. 17. The ecology valve of claim 16 further comprising a sleeve inserted into the structure enclosing the retention passage and wherein the retention passage includes a groove formed into one of the valve housing and the sleeve.18. The ecology valve of claim 16 wherein the cavity is sized such that fluid in the nozzle passage section is pulled into the cavity and retention passage when the movable piston moves from the first position to the second position.19. The ecology valve of claim 18 wherein the retention passage includes a spiral section winding axially about an axis between first and second spiral end portions and the nozzle passage is connected to the first spiral end portion extending axially toward said second spiral end portion to prevent drainage and the cavity is connected to the second spiral end portion.20. The ecology valve of claim 16 wherein the retention passage comprises a plurality of retention passages and the cavity comprises a plurality of cavities connected to the plurality of retention passages.21. The ecology valve of claim 20 wherein the movable piston comprises a plurality of movable pistons that are movable in the plurality of cavities.22. The ecology valve of claim 16 wherein the ecology valve is locatable at any location around the circumference of a combustion chamber of the engine.23. A fuel system for use in an aircraft engine, the fuel system comprising:a fuel pump for pressurizing fuel from a fuel supply, a plurality of fuel nozzles arranged in a combustion chamber, a fuel metering unit for controlling the flow of fuel from the fuel pump to the fuel nozzles; a fuel manifold fluidically connecting the fuel metering unit to the fuel nozzles, and an ecology valve fluidically connected to the fuel manifold, the ecology valve having a cavity for temporary storage of fuel, a retention passage adapted to be connected to the cavity and one of the fuel nozzles, the retention passage winding between the cavity and the fuel nozzle such that no matter which way the ecology valve is oriented gravity alone is unable to drain fuel from the cavity to the one of the fuel nozzles, and control means for suctioning sufficient fuel into the cavity to prevent coking of the nozzles upon engine shutdown for temporary storage and return of the temporarily stored fuel for combustion in the next engine operating cycle. 24. The fuel system of claim 23 wherein the ecology valve further comprises a body, a pressure actuated piston slidably disposed within the body and movable between an unloaded position corresponding to engine shut-down and a loaded position corresponding to engine operation, the piston forming the cavity, and spring means for biasing the piston toward the unloaded position.25. The fuel system of claim 23 wherein the retention passage includes a spiral section winding axially about an axis between first and second spiral end portions, the cavity connected to the second spiral end portion, the ecology valve further comprising a nozzle passage connected to the first spiral end portion extending axially toward said second spiral end portion.26. The fuel system of claim 25 wherein the retention passage comprises a plurality of retention passages and the cavity comprises a plurality of cavities connected to the plurality of retention passages.27. The fuel system of claim 26 wherein the pressure actuated piston comprises a plurality of movable pistons that are movable in the plurality of cavities.28. The fuel system of claim 26 wherein the plurality of retention passages comprise a primary retention passage connected to a primary fuel nozzle passage and a first cavity of the plurality of cavities and a secondary retention passage connected to a secondary fuel nozzle passage and a second cavity of the plurality of cavities and wherein the secondary retention passage is kept dry until a time when flow is required in the secondary fuel nozzle passage.29. The fuel system of claim 23 wherein the ecology valve further comprises a body and a pressure actuated piston slidably disposed within the body, the control means translates the pressure actuated piston to expand the cavity and create a suctioning effect to draw fuel from the one of the fuel nozzles.
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