Claims
- 1. A fuel metering valve capable of operating in an active combustion control system of a gas turbine, the valve comprising:
a valve housing having an inlet port and an outlet port; a nozzle passageway disposed between the inlet and outlet port; a drive assembly disposed in the valve housing and having a movable actuator member disposed along a main axis; a flexure pivot mounted to the housing and the actuator member to allow pivoting of the actuator member with respect to the main axis; and a valve member mounted to be disposed along the main axis and to pivot about the flexure pivot with the actuator member to control flow through the nozzle passageway.
- 2. The valve of claim 1, wherein the actuator and valve member move in proportion to an input current to the drive assembly.
- 3. The valve of claim 1, wherein the flexure pivot has a movable part and a non-moving part in a plane spaced from the movable part and joined thereto by a flexible spoke.
- 4. The valve of claim 1, wherein the drive assembly includes a permanent magnet and an electromagnet including a wire coil disposed about a movable armature actuator member.
- 5. The valve of claim 4, wherein the armature is selectively pulled by magnetic flux toward opposite sides of the main axis causing the valve member to pivot with respect to the main axis and move with respect to the nozzle passageway.
- 6. The valve of claim 1, wherein the valve member is pressure balanced.
- 7. The valve of claim 6, wherein the valve member is a flapper pressure balanced by a piston.
- 8. The valve of claim 7, wherein the piston is a diaphragm piston having a diaphragm under a pressure essentially equal to an input pressure at the inlet port to bias a push rod against the flapper.
- 9. The valve of claim 8, wherein the flapper has a working end that is sized to close off the nozzle passageway and which is biased toward the nozzle by abutment of the push rod.
- 10. The valve of claim 9, wherein the flapper engages the push rod at a movable connection.
- 11. The valve of claim 10, wherein the push rod extends along an axis of the nozzle passageway essentially perpendicular to the main axis.
- 12. The valve of claim 7, wherein the flapper has a flat working end extending essentially perpendicular to the nozzle passageway being arranged and sized to close the nozzle passageway.
- 13. The valve of claim 12, wherein the flapper is mounted at a stem opposite the working end to an armature of the drive assembly disposed along the main axis extending through a center of an electromagnet coil.
- 14. The valve of claim 13, wherein the flapper stem is also mounted to a movable part of the flexure pivot spaced from a non-moving part of the flexure pivot fixed to the valve housing joined to the movable part by a flexible spoke.
- 15. The valve of claim 14, wherein the stem is cylindrical.
- 16. The valve of claim 6, wherein the valve member is a clevis member.
- 17. The valve of claim 16, wherein the clevis has a stem mounted to the actuator member and a forked end defining two prongs located to interrupt flow through a pair of nozzle orifices leading from the nozzle passageway.
- 18. The valve of claim 16, wherein the outlet orifices are slots formed in a valve sleeve defining the nozzle passageway disposed in the valve housing.
- 19. The valve of claim 18, wherein each of the prongs has an elongated tapered leading edge.
- 20. The valve of claim 19, wherein a bridge is mounted between the two prongs of the clevis.
- 21. The valve of claim 20, wherein the valve sleeve defines two pairs of spaced apart nozzle orifices and each prong of the clevis member defines two legs spaced apart in registration with the outlet orifices such that pivoting of the clevis member moves each leg of the clevis member the same distance with respect to its associated nozzle orifice.
- 22. The valve of claim 21, wherein the nozzle orifices are formed in opposite walls of a section of the valve sleeve having a rectilinear outer periphery disposed between the prongs of the clevis and the bridge.
- 23. A fuel metering valve capable of operating in an active combustion control system of a gas turbine, the valve comprising:
a valve housing having an inlet port and an outlet port; a nozzle passageway disposed between the inlet and outlet port; a magnetic drive assembly disposed in the valve housing and having an armature disposed along a main axis and selectively pulled toward opposite sides of the main axis; a flexure pivot disposed about the main axis and having a movable part mounted to the armature and a non-moving part fixed to the housing to allow pivoting of the actuator member with respect to the main axis; a flapper member mounted to the armature and the movable part of the flexure pivot at one end and having a working end adapted to control flow through the nozzle passageway when pivoted about the flexure pivot by movement of the armature; and a pressure balancing piston engaging the valve end of the flapper member to bias the flapper member in the direction of the nozzle passageway.
- 24. A fuel metering valve capable of operating in an active combustion control system of a gas turbine, the valve comprising:
a valve housing having an inlet port and an outlet port; a nozzle passageway disposed between the inlet and outlet port; a magnetic drive assembly disposed in the valve housing and having an armature disposed along a main axis and selectively pulled toward opposite sides of the main axis; a flexure pivot disposed about the main axis and having a movable part mounted to the armature and a non-moving part fixed to the housing to allow pivoting of the actuator member with respect to the main axis; and a clevis member mounted to the armature and the movable part of the flexure pivot at one end and having a forked end defining two prongs symmetrical about the main axis and each adapted to control flow through an associated orifice of the nozzle passageway when the clevis is pivoted about the flexure pivot in response to movement of the armature.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims benefit to U.S. provisional application Ser. No. 60/361,446 filed Feb. 28, 2002.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60361446 |
Feb 2002 |
US |