Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1982-11-30
1985-02-12
Cline, William R.
Heat exchange
Movable heating or cooling surface
Rotary drum
165 51, 123552, 123557, 184 64, 184 622, 60 39093, F02M 3100
Patent
active
044985258
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.
REFERENCES:
patent: 2464047 (1949-03-01), Larkin
patent: 3080716 (1963-03-01), Cummings et al.
patent: 3722212 (1973-03-01), Stein
patent: 4020632 (1977-05-01), Coffinberry et al.
patent: 4041697 (1977-08-01), Coffinberry et al.
patent: 4072138 (1978-02-01), Hawkins et al.
patent: 4151710 (1979-05-01), Griffin et al.
patent: 4169442 (1979-10-01), Fossum
Cline William R.
Rolls-Royce Limited
Walker Edward P.
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