Fan and fan wheel thereof

Details Fan and fan wheel thereof Fan and fan wheel thereof

2009-01-16

2011-10-25

Paumen, Gary F. (Department: 2833)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

C415S220000, C416S243000

Reexamination Certificate

active

08043064

ABSTRACT:
A fan and a fan wheel thereof are provided. The fan comprises the fan wheel and a fan cowl. The fan wheel comprises a hub and a plurality of blades. The hub can define an axial direction and a radial direction, and each of the blades has an axial length and a radial length. The portion of each of the blades that extends along the axial direction over a top edge of a side wall of the hub accounts for the axial length in a ratio between one third and two thirds. A connection portion connecting a central portion to the side wall of the hub, and a tip and a tail of each of the blades, as well as a flow conducting portion connecting a top wall to a central hole of the fan cowl, are all rounded. Thereby, the fan and the fan wheel thereof can strengthen the flow rate and reduce the noise generated by the fan.

REFERENCES:
patent: 4218188 (1980-08-01), Saterdal
patent: 4373861 (1983-02-01), Papst et al.
patent: 4470753 (1984-09-01), Witzel
patent: 4515511 (1985-05-01), Heerlein
patent: 4564335 (1986-01-01), Harmsen et al.
patent: 5664282 (1997-09-01), Castwall et al.

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