Centrifugal fan
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 1, 2013
Grant Date -
Jun 4, 2009
app pub date -
Dec 18, 2007
filing date -
Nov 30, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A centrifugal fan includes a fan frame (20), and a stator (30) and a rotor (40) received in the fan frame. The fan frame includes a bottom base (22), an opposite top cover (21) and a side wall (23) interconnecting the bottom base and the top cover. A first air inlet (24a) is defined in the top cover and a second air inlet (24b) is defined in the bottom base. The rotor includes a hub (41) and a plurality of blades (42) extending from an outer periphery of the hub. An air flow channel (48) is formed between an outer periphery of the blades and the side wall of the fan frame. A cylindrical wall (26, 26a) is formed around one of the first air inlet and the second air inlet to guide airflow from the first and second air inlets into the air flow channel and block the airflow in the air flow channel from flowing back towards the first and second air inlets.
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