ROTOR WITH ADDITIONAL AXIAL FAN AND AXIAL VENTILATION DEVICE

Abstract

The present invention relates to a rotor (20) for an industrial large diameter axial ventilation device (22). The rotor according to the invention comprises a hub (24) and n blades (26). Each blade of the rotor comprises a root portion (28) for structural connection to the hub and an aerodynamic portion (30). The rotor according to the invention further comprises a coaxial associated axial fan (32) with n radially extending vanes (34). The associated axial fan (32) is arranged in an axial view substantially within a region (P) defined by the n radially inner ends of the aerodynamic portions of the rotor blades. The present invention further relates to an industrial large diameter axial ventilation device (22) comprising such a rotor.

Claims

1. A rotor (20) for an industrial axial ventilation device (22) having a hub (24) and n blades (26), Each blade (26) of the rotor (20) comprises a root portion (28) for structural connection to the hub (24) and an aerodynamic portion (30); an associated axial fan (32) is further provided on the rotation axis of the rotor (20) and includes n vanes (34) that are smaller than the radially extending blades (26); the auxiliary axial fan is configured in a region P defined in an axial direction substantially by radially inner ends of the aerodynamic portions (30) of the blades (26) of the rotor (20); The auxiliary axial fan (32) is axially disposed downstream or upstream of the hub (24); The rotor (20) and the associated axial fan (32) are rotatably mounted while maintaining a constant angular position of the vanes (34) relative to the blades (26) as viewed in the axial direction. Rotor (20).

2. The rotor (20) of claim 1, wherein, when viewed in the axial direction, the auxiliary axial fan (32) is inscribed within the region P.

3. The rotor (20) of claim 1 or 2, wherein the auxiliary axial fan (32) comprises a central portion (42) from which the n blades (34) extend radially.

4. A rotor (20) according to claim 1 or 2, wherein the auxiliary axial fan (32) is obtained by directly mounting n independent blades (34) on the rotor (20).

5. 3. A rotor (20) according to claim 1 or 2, wherein the radial extension (B) of the blades (34) of the auxiliary axial fan (32) is configured between 60% and 75% of a radius d / 2 of the auxiliary axial fan (32).

6. 3. A rotor (20) according to claim 1 or 2, wherein the radial extension (B) of the blades (34) of the auxiliary axial fan (32) is configured between 65% and 70% of a radius d / 2 of the auxiliary axial fan (32).

7. A rotor (20) according to claim 1 or 2, wherein the axial extension (a) of the blades (34) of the auxiliary axial fan (32) is configured within 20% of a diameter d of the auxiliary axial fan (32).

8. A rotor (20) according to claim 1 or 2, wherein the axial extension (a) of the blades (34) of the auxiliary axial fan (32) is configured between 5% and 15% of the diameter d of the auxiliary axial fan (32).

9. 3. The rotor (20) of claim 1 or 2, wherein the blades (34) of the auxiliary axial fan (32) comprise a root portion (54) for structural connection to the hub (24) and an aerodynamic portion (56).

10. The rotor (20) of claim 1 or 2, wherein the auxiliary axial fan (32) is constructed as a single monolithic component.

11. A rotor (20) according to claim 1 or 2, wherein the thickness t of each blade (34) of the auxiliary axial fan (32) is substantially uniform throughout the extension of the blade (34).

12. 3. The rotor (20) of claim 1 or 2, wherein a thickness (t) of the blades (34) of the auxiliary axial fan (32) is comprised between 10% and 20% of an axial extension (a) of the blades (34) of the auxiliary axial fan (32).

13. 2. The rotor (20) of claim 1, wherein at least one of the blades (26) comprises a winglet (36) at a radially outer end thereof, the winglet (36) comprising a baffle (44) extending in the axial and circumferential directions.

14. An industrial ventilation device (22) comprising a rotor (20) and a motor (46) according to claim 1.

15. The industrial ventilation system (22) of claim 14, further comprising a duct (48) surrounding the rotor (20).

16. 16. The industrial ventilation system (22) of claim 15, wherein the duct (48) extends circumferentially around the rotor (20) and includes an annular seat (50) that partially receives outer ends of the blades (26) of the rotor (20).

17. 14. An industrial ventilation system (22) comprising: a rotor (20) according to claim 13; a motor (46); and a duct (48) surrounding the rotor (20), the duct (48) extending circumferentially around the rotor (20) and comprising annular seats (50) for partially accommodating outer ends of the blades (26) of the rotor (20), the annular seats (50) extending at least partially axially and partially accommodating the baffles (44) defined by the winglets (36).

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