Emergency device for restarting a turbojet in autorotation

F - Mech Eng,Light,Heat,Weapons – 02 – C

Patent

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Details

F02C 7/26 (2006.01) F02C 3/113 (2006.01) F02C 7/262 (2006.01)

Patent

CA 2389780

Safety device for re-lighting a windmilling turbomachine comprising a fan (2) driven by a low- pressure turbine via a first shaft (3), a compressor driven by a high-pressure turbine via a second shaft (4) disposed coaxially with the first shaft, a differential (5) linking the first and second shafts and compensating for their different rotational speeds during normal turbine operation, and a braking system (6) connected to the differential so as to slow or stop the latter when the turbine shuts down, in a manner such that the first shaft (3) then drives the second shaft (4) so that the latter reaches a speed suitable for re-lighting the turbine. Figure 1.

Dispositif de secours au rallumage d'un turboréacteur en autorotation comportant une soufflante (2) entraînée par une turbine basse pression par l'intermédiaire d'un premier arbre (3), un compresseur entraîné par une turbine haute pression par l'intermédiaire d'un second arbre (4) disposé coaxialement par rapport au premier arbre, un différentiel (5) reliant les premier et second arbres en compensant leurs différences de vitesse de rotation lors du fonctionnement normal du turboréacteur, et un système de freinage (6) relié au différentiel afin de pouvoir ralentir ou bloquer celui-ci lorsque le turboréacteur s'éteint, de sorte que le premier arbre (3) entraîne alors le second arbre (4) pour que ce dernier atteigne un régime favorisant le rallumage du turboréacteur.

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