Patent ID: 9694907
Date: 2017-07-04
CPC Classifications: B64C

Claim:
1. A lift-generating device for a vertical- or short-takeoff heavier-than-air aircraft, using the lift-generating effect obtained by blowing a majority of an air flow produced by an air flow generator over deflecting surfaces linked to a load-bearing structure, the device comprising two longitudinal deflecting surfaces, arranged on either side of a roll axis of the device and extending substantially parallel with said roll axis, said two longitudinal deflecting surfaces being symmetrical with one another with respect to a plane defined by said roll axis and a yaw axis of the device, said air flow generator comprising at least two axial fans having axes which are substantially parallel with said yaw axis, and mutually offset on said roll axis, said axial fans being mounted in said load-bearing structure, and each drawing ambient air via a respective intake opening arranged in an upper face of said load-bearing structure, using at least one multi-blade rotor driven in rotation about an axis of a corresponding axial fan and faired in a flow path with a circular cross-section extending said inlet opening towards an inside of said load-bearing structure, wherein said at least two axial fans each comprise at least two stages having pluralities of blades, one of which is said multi-blade rotor mobile in rotation about the corresponding axis, and the lift-generating device comprises, downstream of each of said at least two axial fans, an air distributer-diffuser, consisting of two adjacent semi-distributors, symmetrical with one another with respect to a plane defined by said axis of said corresponding axial fan and said roll axis, each semi-distributor delimiting a curved duct having an inlet opening receiving one of two halves of the air flow leaving said corresponding axial fan, on a side of respectively one of said two longitudinal deflecting surfaces, and guiding the air that passes through said curved duct to an outlet opening incorporated in respectively one of two lateral faces of said load-bearing structure by means of a plurality of channels extending at least over a portion of a length of said curved duct and delimited by deflecting partitions formed by generatrices parallel with said roll axis, and towards said longitudinal deflecting surface situated on a same side as said semi-distributor, so that an air flow drawn in by each said axial fan is divided into two halves, the majority of each of which is laterally blown over respectively one of said two longitudinal deflecting surfaces.