Rotatory pump having a knobbed impeller wheel, and a knobbed impeller wheel therefor

The invention relates to a rotatory pump having a housing (20) and an impeller wheel (40) which is mounted on a driving shaft (30) to rotate integrally therewith, said driving shaft being rotatably supported in said housing, and which has a disk (44) disposed to be concentric with said driving shaft (30), radially extending blades (46) directed along the axial direction of said driving shaft (30) being provided on said disk, and said blades, together with the inner wall portions (22a) of the housing (20) which face the blades (46), forming flow channels for the fluid to be pumped. Furthermore, provision is made for at least one raised portion (48) to be provided on each of the radially extending edges (46a) of preferably three blades (46), said raised portions being enabled to bear against the inner wall portions (22a) of the housing (20) which face the blades (46) of the impeller wheel (40).