Hydraulic control system for controlling the orientation of fan blades

Hydraulic control system for controlling the orientation of fan blades of a turbomachine comprising at least one set of variable-pitch fan blades operated by actuators (10, 12) connected to a hydraulic pump (18), a small pitches protection valve (24, 26) controlled by an associated electrovalve (22)...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	REGIS MICHEL PAUL DELDALLE, CAROLINE FRANTZ
Format:	Patent
Sprache:	eng
Schlagworte:	AEROPLANES AIRCRAFT AVIATION BLASTING COMBUSTION ENGINES COSMONAUTICS HEATING HELICOPTERS HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS JET-PROPULSION PLANTS LIGHTING MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT PUMPS PERFORMING OPERATIONS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	Hydraulic control system for controlling the orientation of fan blades of a turbomachine comprising at least one set of variable-pitch fan blades operated by actuators (10, 12) connected to a hydraulic pump (18), a small pitches protection valve (24, 26) controlled by an associated electrovalve (22) making it possible, on the ground, when the blades are oriented almost perpendicular to the axis of the turbomachine, to switch from a first operating zone (A) in which the rate at which the blades are oriented is slow to a second operating zone (B) in which the rate of orientation is appreciably higher, in which system the operating pressure of the hydraulic pump is controlled by the electrovalve that controls the small pitches protection valve so as to define two levels of output corresponding to the two operating zones.