Jet engine fuel delivery system with non-pulsating diaphragm fuel metering pump
AssigneeJansen's Aircraft Systems Controls, Inc.
InventorHarvey B. Jansen
Life of this patent
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Abstract
Disclosed herein is a fuel metering pump for delivering fuel to rocket or jet engine having a motor driven face cam and a pair of reciprocating rolling diaphragm pump mechanisms movable through opposite suction and pump strokes. The face cam has a ramping cam surface that extends radially more than 180 degrees. This permits both pump mechanisms to be simultaneously in the pump stroke for a portion of the pump stroke so that they alternately reciprocate through the suction and pump strokes at essentially a constant velocity, thereby providing an essentially non-pulsating flow of fuel to the engine.
Claims17
A system for supplying combustible fuel to a fuel consuming device, the system comprising:
- a combustible fuel source;
- a fuel metering pump having a housing defining an outlet port and an inlet port, the inlet port being in communication with the fuel source and leading to a pair of pump chambers, each pump chamber being sealed by a diaphragm to which is connected a pumping member biased at one end to a but a motor driven face cam operating to alternately reciprocate the pumping members through pump and suction strokes within the pump chambers;
- and
- a fuel line leading from the outlet port to the fuel consuming device;
- the fuel metering pump further comprising means for fuel metering and pumping substantially constant pressure fuel to the fuel consuming device without the need for an accumulator metering valve.
A fuel metering pump suitable for delivering fuel to rockets and jet engines, comprising:
- (1) a drive mechanism including:
- (A) a drive motor having an axial shaft;
- (B) a disk-shaped face cam mounted to the motor shaft and having a ramped cam surface at an outer face;
- and
- (2) a pair of pumping members disposed in separate pump chambers defined by a housing mounted over an orifice of a fuel tank, the housing having an inlet controlled by a reed valve to be in communication with the fuel and each pumping member being movable through opposite suction and pump strokes and including:
- (A) a cam roller biased against the face cam by a spring so as to be contacted by the ramped cam surface;
- (B) a connector rod connected to the cam roller at one end;
- (C) a head plate connected to the connector rod at an end opposite the cam roller;
- (3) a fuel resistant diaphragm sealing openings to the pump chambers and attached to the head plate so as to roll back as the pumping members are moved through the suction and pump strokes;
- wherein the ramped cam surface of the face cam extends radially more than 180 degrees so that both pump mechanisms are simultaneously in the pump stroke for a portion of the pump stroke and the pumping members alternately reciprocate through the suction and pump strokes at essentially a constant velocity.
Dependencies are inferred from the claim text.