Cooling fan having protrusion at air outlet thereof

Details Cooling fan having protrusion at air outlet thereof Cooling fan having protrusion at air outlet thereof

2011-08-30

2011-08-30

Kershteyn, Igor (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

C416S20400A, C416S205000, C416S206000, C416S224000

Reexamination Certificate

active

08007239

ABSTRACT:
A cooling fan (20) includes a housing (22) and an impeller (24). The housing has a base (221), a sidewall (222) extending from a periphery of the base with an air outlet (226) defined therein, and a cap (223) covering the sidewall. The impeller has a plurality of blades (242) rotatably received in the housing for generating an airflow. An air channel (225) is formed between tip portions of the blades and an inner face of the sidewall. The air outlet has a near section (226A) and a far section (226C). The airflow first reaches the near section and then the far section. The base of the housing has a protrusion (227) extending into the air outlet for guiding the airflow flowing towards the far section from the near section of the air outlet.

REFERENCES:
patent: 3687360 (1972-08-01), Prew et al.
patent: 5997246 (1999-12-01), Humbad
patent: 6049455 (2000-04-01), Nakamura et al.
patent: 6805536 (2004-10-01), Hung
patent: 7481617 (2009-01-01), Hsu et al.

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