Vacuum cleaner with tangential separation of trash

A device for separating and collecting dirt from a floor, a dirt collecting appliance of the vacuum cleaner type comprising particularly a suction group connected to the surface to be vacuumed by a pipe (2, 3, 4) terminated by a floor nozzle (1), said device having a first tube (8a) having an air intake (13) capable of receiving suctioned air and guided by the pipe and an air delivery outlet, a screw (11) positioned in a substantially axial manner in this first tube (8a), a second tube (9) having a diameter less than the exterior diameter of the screw (11) and situated coaxially in the extension of the first tube (8a), in ventilating communication by one end to the delivery end of the first tube (8a) and in communication via its other end with the suction group by a first evacuation conduit (14), characterized in that the device comprises a third tube (8b) arranged around the second tube (9) and connected to the delivery end of the first tube (8a) in such a manner as to arrange, between the second and third tube (9, 8b) a second conduit (21) for discharging dirt toward a filter and/or a container (10) in a secondary output flow.