Abstract: The screw-type centrifugal wheel pump (1) comprises a pump housing (3) and a screw-type centrifugal wheel (20) arranged rotatably within the pump housing (3) and having a hub (21) and a blade (25), and comprises a rotatable drive shaft (33) connected to the screw-type centrifugal wheel (20), and comprises a cover plate (2) arranged between the screw-type centrifugal wheel (20) and a housing rear wall (23), wherein the cover plate (2) has a central opening (2g) through which the hub (21) or the drive shaft (33) runs, and wherein an interior space (37) is formed between the cover plate (2) and the housing rear wall (23), wherein a gap (2b) is formed between the central opening (2g) of the cover plate (2) and the hub (21) or the drive shaft (33), which gap is connected in fluid-conducting fashion to the interior space (37), wherein the cover plate (2) has at least one aperture (2a), which is arranged spaced apart from the central opening (2g), in order to generate a fluid flow (F1) which flows into the interior