Fuel/oil heat exchange system for an engine
US4498525A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1982 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Nov 30, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/60
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel/oil heat exchange system is proposed for an aircraft gas turbine engine for heating fuel leaving the aircraft fuel tanks before it enters the engine fuel system. The proposed system eliminates the separate fuel heater. The oil system is designed so that the fuel is not overheated at the hottest engine conditions, and the fuel/oil heat exchange system is made to increase the temperature of the oil if the fuel temperature drops below a pre-determined limit. Referring to FIG. 2 of the drawings, oil from the engine gearbox 16 is passed by scavenge pump 20 to a fuel heating coil 14 in the heat exchanger 12. Fuel from the aircraft passes through the heat exchanger prior to entering the fuel system 7 through fuel filter 6. A temperature sensing device 26 signals a reduction in fuel temperature below a desired level and closes a valve 24 preventing oil passing beneath baffle 25 to the scavenge pump. This causes the oil level to rise until oil spills over the baffle 25, at which level the gears 23 dip into the oil and churn it causing its temperature to increase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.