Fuel injection supply circuit for providing a metered decontaminated flow of fuel to the fuel injectors
AssigneeSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
InventorYves Robert Halin
Life of this patent
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Abstract
A fuel injection supply circuit including a main filter situated between a low pressure pump and a high pressure pump, and a fuel metering device for supplying a metered flow of fuel to the fuel injectors, is provided with a self-cleaning filter downstream of the high pressure pump such that a first portion of the fuel flow received by the self-cleaning filter is filtered to provide a clean flow of fuel to the fuel metering device and the excess portion of the received fuel flow passes through the center of the self-cleaning filter and is returned, via a control valve, to the circuit upstream of the main filter.
Claims2
A fuel injection supply circuit for providing a metered decontaminated flow of fuel to the fuel injectors of said circuit, comprising a fuel flow path including a low pressure pump and a high pressure pump, a main filter located between said low pressure pump and said high pressure pump, a self-cleaning filter located downstream of said high pressure pump and including a filter cartridge disposed such that a first portion of the fuel flow received by said self-cleaning filter from said high pressure pump is filtered by said filter cartridge to provide a clean output fuel flow and a second portion of said received fuel flow washes substantially through the center of said self-cleaning filter to provide an excess fuel flow, a fuel metering device for receiving said clean output fuel flow from said self-cleaning filter and supplying a metered flow of fuel to said fuel injectors, and means including a control valve for returning all of said excess fuel flow from said self-cleaning filter to said fuel flow path upstream of said main filter.
Dependencies are inferred from the claim text.