Fuel staging system
US5442922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Dec 9, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23R3/28
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a fuel staging system, metered fuel from a fuel metering unit is directed into a fuel inlet line coupled to a sequence valve. A minimum pressure valve maintains the pressure of the fuel flowing through the fuel inlet line at a minimum pressure above the low pressure of the system in order to ensure sufficient force margins to stroke the sequence valve. A main fuel manifold is coupled downstream of the sequence valve, and a plurality of main fuel nozzles are each coupled to the main fuel manifold through a respective main nozzle shut-off valve. A first set of pilot nozzles is coupled to the main fuel manifold through the sequence valve, and a second set of pilot nozzles is coupled to the main fuel manifold through the sequence valve. At low engine speeds, in the first and/or second pilot open positions, fuel flows to either pilot nozzle through the main fuel manifold, and the main fuel nozzles are isolated from the main fuel manifold by the main nozzle shut-off valves. Then, at higher engine speeds, the main nozzle shut-off valves are opened, and the sequence valve splits the fuel flow from the fuel inlet line between the main fuel manifold and the first and second pilot nozzles.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.