Blower fan, in particular for blowing apparatuses, and blowing apparatus provided thereof

A blower fan, in particular for blowing apparatuses, comprising:

• a support element (13) presenting a first face (13a) and a second face (13b) mutually opposite to said first face (13a), said first and second faces (13a, 13b) being respectively invested at least by a first and a second air flows (10, 11) coming from mutually opposite directions, said support element (13) being radially delimited at a predetermined maximum radial distance;
• at least one air passage (13c) provided in the support element (13) and defined at a perimetral edge (15b) located in the support element (13) at a radial distance inferior than said predetermined maximum radial distance, said at least one air passage (13c) being adapted to direct at least said first air flow (10) investing said first face (13a) at least partly through said support element (13);
• a first blade series emerging from said first face (13a) and comprising first blades (8) having first root portions (8a) located on the central portion (15) and tip extensions (8c) radially opposite to said first root portion (8a) and extending beyond said perimetral edge (15b), said tip extensions projecting both from said first face (13a) and from said second face (13b);
• a second blade series emerging from said first face (13a) or from said second face (13b) and comprising second blades (9) having second root portions (9a) located in correspondence of said at least one air passage (13c) and second tip portions (9c) radially opposite to said second root portions (9a) and located on a peripheral portion (16a);
• and
• a third blade series emerging from said second face (13b) and comprising third blades (20) having third root portions (20a) located in correspondence of a hub portion (14) and third tip portions (20c) radially opposite to said third root portions (20a) and located in correspondence of said at least one air passage (13c).

A blower fan, in particular for blowing apparatuses, comprising:

• a support element (13) presenting a first face (13a) and a second face (13b) mutually opposite to said first face (13a), said first and second faces (13a, 13b) being respectively invested at least by a first and a second air flows (10, 11) coming from mutually opposite directions, said support element (13) comprising a central portion (15) presenting a rest surface defining at least partly said first and said second faces (13a, 13b) and a perimetral edge (15b) located in the support element (13) at a predetermined radial distance inferior than a predetermined maximum radial distance;
• a main peripheral portion (16a) axially displaced along said rotation axis (2a) and adjacent to said central portion (15) in correspondence of said perimetral edge (15b) and radially extending from said perimetral edge (15b) at a predetermined maximum radial distance;
• at least one air passage (13c) provided in the support element (13) and of said perimetral edge (15b), said at least one air passage (13c) being adapted to direct at least said first air flow (10) investing said first face (13a) at least partly through said support element (13), said at least one air passage (13c) being defined by an ideal surface in correspondence of said perimetral edge (15b) and lying between said central portion (15) and said main peripheral portion (16a);
• a first blade series emerging from said first face (13a) or from said second face (13b);
• a second blade series emerging from said first face (13a) or from said second face (13b);
• and
• a third blade series emerging from at least one of said first face (13a) and said second face (13b), said third blade series being geometrically different from at least one of said first blade series and said second blade series.