Diagonal fan having swirl reduction at the diagonal impeller

A diagonal fan comprising an electric motor, a housing, and a diagonal impeller, which is received inside the housing and is drivable via the electric motor, and the diagonal flow of which generated in operation is deflected in an axial flow direction,

• wherein the diagonal impeller includes impeller blades distributed in the circumferential direction and a slinger ring, which encloses the impeller blades in the circumferential direction,
• wherein the diagonal fan furthermore includes an inlet nozzle on the suction side, through which a main flow (HS) of the diagonal fan is suctioned in, wherein the inlet nozzle extends overlapping at least in sections in relation to the slinger ring viewed in radial section and forms a nozzle gap with the slinger ring at the same time,
• wherein a bypass channel is formed on the housing, which forms a flow connection from a pressure-side surrounding region (U) of the diagonal fan to an inflow side of the nozzle gap, so that in operation of the diagonal fan, a swirl-free secondary flow (NS) is guided at the inflow side of the nozzle gap via the bypass channel,
• wherein an inner wall of the housing deflects the diagonal flow generated by the diagonal impeller into the axial flow direction,
• wherein the diagonal fan furthermore includes a redirection device located such that the flow connection formed between the bypass channel and the pressure-side surrounding region (U) is downstream of the redirection device.