Device and method for balancing pressure in a turbojet...

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 17/20 (2006.01) F01D 17/14 (2006.01) F01D 25/16 (2006.01) F01D 25/18 (2006.01) F02C 7/06 (2006.01) F02C 7/28 (2006.01)

Patent

CA 2719472

The invention relates to a device for balancing pressure in at least one turbojet bearing housing (20, 30, 80) comprising means for supplying lubricating liquid to said bearing (22, 32), air inlet means, at least one sealing system placed between the stator and the rotor at the front and/or rear of said bearing, means for recovering the lubricating liquid and means for discharging the mixture of air (24, 34, 64) and lubricating liquid traces towards a degassing circuit (60). In a characteristic manner, the balancing device comprises, downstream of the bearing housing, and in the degassing circuit, a system (100) for regulating the discharged air flow that allows said flow to be variable as a function of the speed of the engine and to remain non-zero and that makes it possible to reduce the value of the air flow discharged at a high engine speed by comparison with the case where the regulating system has not been incorporated.

L'invention concerne un dispositif d'équilibrage de pression dans au moins une enceinte palier (20, 30, 80) de tarboréacteur comprenant des moyens d'alimentation en liquide de lubrification dudit palier (22, 32), des moyens d'arrivée d'air, au moins un système d' étanchéité placé entre le stator et le rotor à l'avant et/ou à l'arrière dudit palier, des moyens de récupération du liquide de lubrification et des moyens d'évacuation du mélange d'air (24, 34, 64) et de traces de liquide de lubrification en direction d'un circuit de dégazage (60). De façon caractéristique, le dispositif d'équilibrage comporte, en aval de l'enceinte palier et dans le circuit de dégazage, un système de régulation (100) du débit d'air évacué qui permet audit débit d'être variable en fonction du régime du moteur, de rester non nul et de réduire la valeur du débit d'air évacué à haut régime par rapport au cas où le système de régulation n'est pas intégré.

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