Patent ID: 7788764

Claim:
Suction device for cleaning jobs comprising: a bladed impeller ( 1 ) actuated by a motor and housed inside a carcass ( 50 ), said carcass ( 50 ) provided with only one inlet opening for an airflow and only one outlet opening, wherein said impeller ( 1 ) comprises a first series of blades ( 2 ) and a second series of blades ( 3 ), which rotate about a rotation axis and are firmly fixed together, coaxial to each other and distributed in a staggered manner, the first series of blades being generally flat and extending axially at an angle relative to the rotation axis for generating an axial flow directed to the centre of the second series of blades, and the second series of blades generating a radial flow, said second series of blades ( 3 ) being arranged downstream of the first series of blades ( 2 ), with respect to the only one inlet opening, so that all the air sucked in is transmitted from the first series of blades ( 2 ) to the second series of blades ( 3 ) through a space therebetween before it reaches the only one outlet opening.