Vane fuel pump having reduced displacement at high speeds

Details Vane fuel pump having reduced displacement at high speeds Vane fuel pump having reduced displacement at high speeds

1986-11-21

1987-12-08

Croyle, Carlton R.

Rotary expansible chamber devices

With changeable working chamber magnitude

Spring or fluid biased movable member

418 31, F03C 200, F04C 200, F04C 1504

Patent

active

047116196

ABSTRACT:
A variable displacement vaned fuel pump (10) is suitable for inclusion in a fixed displacement fuel control system for a gas turbine engine. The pump includes two track elements (34,36) having cam surfaces (42) which engage cam followers (44) on a cam actuation ring (40). A link (66) having a predetermined spring load maintains the track elements in their radially inner maximum displacement positions until the vane force and pressure forces drive the track elements radially outwardly, moving the actuation ring against its spring load. Displacement of the pump is reduced in the radially outward positions of the track elements which reduces the required bypass flow to hold a head constant across a fuel metering valve and attendant fuel heating.

REFERENCES:
patent: 2592247 (1952-04-01), Coe
patent: 3645652 (1972-02-01), Cygnor

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