Shrouding for a fan and its application in an automobile engine fan

摘要

The fairing, comprising inter alia a fixed part made of a diffuser which has a fixing base (11), a funnel nozzle (12), a connection zone (13), a cylindrical skirt (14) and a movable part capable of rotating about an axis (200) which has a peripheral shaped annular hoop (21) which is intended to be fastened securely to tips of blades of a fan which is mounted coaxially in this skirt (14) so as to be able to rotate therein characterised in that, taking as references the direction of flow and the axis (200), this hoop (21) is delimited by an inner wall (2101) an outer wall (2102) and a rear section (2103), this connection zone (13) is delimited particularly by an inner surface (131) with an upstream end (1310), and in that this rear section (2103) of the hoop (21) is located in a plane (P) which is perpendicular to the axis (200) and which passes practically through the upstream end (1310) of the inner surface (131) of the connection zone (13). IMAGE