Patent ID: 9140225
Filing Date: 2015-09-22
Classification: B64D,F02C,F02M,F05D

Abstract:
1. A fluid flow network for feeding fuel to at least one engine of a power plant driving the rotation of at least one rotary wing of a rotorcraft, the fluid flow network comprising at least: at least one main fuel tank housing a feeder tank fed with fuel from the main tank by a transfer circuit for transferring fuel at low pressure from the main tank to the feeder tank; said transfer circuit including at least one transfer pump immersed in the feeder tank and at least one transfer ejector immersed in the main tank; a fuel suction pump fitted to the engine, the suction pump taking fuel from the feeder tank and conveying it at high pressure to the engine via a feed circuit; and a priming pump for priming the suction pump with fuel, the priming pump being immersed in the feeder tank, from which feeder tank the priming pump takes fuel and discharges it to the feed circuit; wherein: the feed circuit is provided with a feed ejector immersed inside the feeder tank, the feed ejector comprising: a nozzle for admitting a primary stream of fuel into a main channel having a constriction and leading to the feed circuit; and a secondary channel for passing a secondary stream of fuel, the secondary channel leading from upstream of the main channel; and wherein the priming pump is formed by the transfer pump, the transfer circuit including a branch connection for admitting a said primary stream of fuel through the nozzle to the main channel, said admission of the primary stream of fuel being fed by the transfer circuit by being forced at low pressure by the transfer pump.