System for injecting fuel into a turbomachine
View Patent ↗A system for injecting fuel into a turbomachine comprising N fuel injectors placed in a combustion chamber of the turbomachine and fed from a fuel tank, the injection system further comprising, interposed between the N injectors and the tank, a single pumping means for taking fuel from the tank and delivering N metered flow rates of fuel to the injectors.
1. A system for injecting fuel into a turbomachine having N fuel injectors placed in a combustion chamber of the turbomachine and fed from a fuel tank, the system further comprising, interposed between said N injectors and said tank, a single pumping means for taking fuel from the tank and delivering N metered fuel flows to the injectors,
wherein said single pumping means comprises an assembly formed by:
a drive shaft having a longitudinal axis and fitted with N same-diameter drive gears:
a driven shaft of longitudinal axis parallel to the longitudinal axis of the drive shaft. provided with N same-diameter driven gears meshing with said N drive gears; and
N-l sealing partitions placed transversely between pairs of adjacent gears on the drive and driven shafts so as to define N fuel admission zones and N fuel delivery zones situated on either side of a longitudinal plane containing the longitudinal axes of the drive and driven shafts, said N fuel admission zones communicating with one another via holes pierced through the sealing partitions;
said assembly being fitted longitudinally in leaktight manner in a cylindrical body having at least one fuel admission orifice connected to the tank and opening out into any one of the admission zones, and N fuel delivery orifices each opening out into a respective one of the N fuel delivery zones to feed each of the N injectors.
2. A fuel injection system according to claim 1 , wherein the N metered fuel flows are at identical rates.
3. A fuel injection system according to claim 1 , further comprising means for adjusting the rates of the metered fuel flows.
4. A fuel injection system according to claim 1 , wherein the N driven gears are identical in diameter to the N drive gears.
5. A fuel injection system according to claim 1 , wherein the delivery orifices are aligned in a zigzag configuration on two longitudinal rows parallel to the longitudinal axes of the drive and driven shafts.
6. A fuel injection system according to claim 1 , wherein the cylindrical body of the single pumping means has a single fuel admission orifice pierced through one end thereof.
7. A fuel injection system according to claim 1 , wherein the drive shaft is driven in rotation by motor means.
8. A fuel injection system according to claim 7 , wherein the means for adjusting the metered flow rates of fuel comprises a variable speed device acting on the speed of rotation of the drive shaft.
9. A system for injecting fuel into a turbomachine having N fuel injectors fed from a fuel tank, the system comprising, interposed between said N injectors and said fuel tank, a pump configured to pump fuel from the fuel tank and deliver N fuel flows to the fuel injectors,
wherein said pump comprises an assembly comprising:
a drive shaft coupled to N drive gears;
a driven shaft provided with N driven gears meshing with said N drive gears; and
sealing partitions placed between pairs of adjacent gears on the drive and driven shafts so as to define N fuel admission zones and N fuel delivery zones, said N fuel admission zones communicating with one another;
said assembly being located in a body having at least one fuel admission orifice connected to the fuel tank and opening out into any one of the N fuel admission zones, and N fuel delivery orifices each opening out into a respective one of the N fuel delivery zones to feed each of the N injectors.
10. A fuel injection system according to claim 9 , wherein said pump is a single pumping means for pumping said fuel and for delivering said N fuel flows.
11. A fuel injection system according to claim 9 , wherein said N fuel flows delivered by said pump are metered.
12. A fuel injection system according to claim 9 , wherein said drive shaft is fitted with said N drive gears and said N drive gears are of a same diameter.
13. A fuel injection system according to claim 9 , wherein said drive shaft has a longitudinal axis and said driven shaft has a longitudinal axis parallel to the longitudinal axis of the drive shaft.
14. A fuel injection system according to claim 9 , wherein said N driven gears of said driven shaft are of a same diameter.
15. A fuel injection system according to claim 9 , wherein said pump comprises N- 1 of said sealing partitions, and said sealing partitions are placed transversely between said pairs.
16. A fuel injection system according to claim 13 , wherein said N fuel admission zones and said N fuel delivery zones are situated on either side of a longitudinal plane containing the longitudinal axes of the drive and driven shafts.
17. A fuel injection system according to claim 9 , wherein said N fuel admission zones communicate with one another via holes pierced through the sealing partitions.
18. A fuel injection system according to claim 9 , wherein said assembly is fitted longitudinally in leaktight manner in said body.
19. A fuel injection system according to claim 9 , wherein said body is cylindrical.