Thrust reverser comprising movable cascades and a sealing membrane

A thrust reverser for an aircraft propulsion unit, the thrust reverser comprising a fixed structure fitted with a radially inner delimiting wall of a secondary flow path of the propulsion unit intended to be passed through by a secondary flow, the thrust reverser also comprising a movable structure including at least one reverser cowl and at least one assembly of cascade vanes, said at least one assembly of vanes comprising a plurality of cascade vanes as well as a rear vane support structure to which a rear end of the plurality of cascade vanes is attached, and a front vane support structure to which a front end of the plurality of cascade vanes is attached, the movable structure being movable in translation relative to the fixed structure along a central longitudinal axis of the thrust reverser, between a forward direct thrust position and a rearward reverse thrust position,

• wherein the thrust reverser comprises at least one sealing membrane designed to divert at least part of the secondary flow towards said at least one assembly of cascade vanes, when the movable structure is in the rearward reverse thrust position,
• the thrust reverser also comprising, associated with said at least one sealing membrane:
• first flexible attachment means connecting a first end of the membrane to the fixed structure of the thrust reverser,
• second attachment means connecting a second end of the membrane, opposite the first end, to the fixed structure or to the movable structure, the second attachment means being fixed to the radially inner delimiting wall of the secondary flow path, or guided by internal guiding means fixed to said same radially inner delimiting wall,
• the assembly formed by the membrane and the first and second attachment means being guided by front guiding means integral with the front vane support structure, and guided by rear guiding means integral with the rear vane support structure,
• the thrust reverser being designed such that in the forward direct thrust position of the movable structure, at least part of the sealing membrane extends along the assembly of cascade vanes.