Altitude-sensitive fuel flow control device

Details Altitude-sensitive fuel flow control device Altitude-sensitive fuel flow control device

1990-03-06

1991-02-12

Hepperle, Stephen M.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

137 811, 137501, F02D 3500

Patent

active

049913921

ABSTRACT:
In order to control fuel flow at a fuel delivery point for auxiliary power units, and for other low fuel flow applications, an altitude-sensitive fuel flow control device (10) includes a fuel inlet (12) in communication with a fuel source and a fuel outlet (14) in communication with a fuel combustor. The device (10) includes an axially extending rod (16) having a metering surface (22) intermediate the ends (24, 26) thereof which may be located in various positions relative to a fuel flow path (18a, 18b, 18c, 18d, 18e) extending from the fuel inlet (12) to the fuel outlet (14) by axial movement of the rod (16) which varies fuel flow within a preselected range of altitude-dependent fuel flow rates. In order to move the axially extending rod (16) to variously position the metering surface (22) relative to the fuel flow path (18a, 18b, 18c, 18d, 18e), an aneroid bellows (28) movable responsive to changes in ambient pressure is interconnected with the axially extending rod (16) and a differential pressure regulaator (52) is in communication with the fuel flow path (18a, 18b, 18c, 18d, 18e) upstream and downstream of the metering surface (22) for maintaining a constant pressure drop independently of altitude.

REFERENCES:
patent: 2674847 (1954-04-01), Davies et al.
patent: 3041826 (1962-07-01), Coar
patent: 3791413 (1974-02-01), Muller et al.
patent: 4034559 (1977-07-01), Dimitriev et al.
patent: 4155535 (1979-05-01), Seamone
patent: 4391290 (1983-07-01), Williams

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