TURBOJET ENGINE (TJE) PROPULSION UNITS BOX (PUB) OPERATION METHOD AND PUB OPERATING BY THIS METHOD (OPTIONS), METHOD OF TJE PU AFTERBURNER PUMP OPERATION AND THE AFTERBURNER PUMP OPERATING BY THIS METHOD Russian patent published in 2018 - IPC B01J3/00 F02C7/06 

FIELD: motors and pumps.

SUBSTANCE: group of inventions belongs to the field of aircraft engine building. PUB operation at the engine start includes three stages. At the engine start-up first stage, the starting torque from the starter to the PUB is transmitted through the start-up gearbox and the most part is directed to the HPH shaft through the multi-stage gearbox. Other part is divided into shared starting torques and transferred to the PUB units through the branched network of gearboxes. At the second stage, the PUB units receive the torque from the starter and, simultaneously with the increase in the engine's share, receive the rotational energy from the HPH shaft. After the starter disconnection, the engine startup third stage is performed before the HPH shaft reaches the low-speed rotations, in which the torque is fed to the units in the PUB only from the HPH shaft through the operational multi-stage gearbox, which is equipped with the PUB input shaft main distributor wheel. PUB afterburner pump includes pumping unit, impeller, start-up and minimum afterburner holding valve, in the engine startup mode shutting off the afterburning fuel from the OP to the AP starting unit, and to the fuel bypass valve at the unit outlet. AP also includes the main afterburning fuel input valve from the DCP into the AP pumping unit impeller cavity, the afterburning fuel outlet from the AP, and the two-stage ejector. Impeller receives the rotation energy in three stages. At the first stage, the starting torque is supplied to the pumping unit drive shaft from the starter via the start gearbox. At the second stage, the AP impeller receives the rotation energy simultaneously through the starting gearbox from the starter, with redistribution and increase in the energy contribution created by the speed gaining HPH shaft. At the third stage, the AP pumping unit receives the rotational energy from the engine's HPH, gaining speed until stable idle speed, with the AP bringing into the full readiness state to switch the engine afterburner on.

EFFECT: invention allows to increase the efficiency by 2 % and more than double engine life.

16 cl, 4 dwg