ELECTRIC FAN
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United States of America Patent
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N/A
Issued Date -
Aug 11, 2011
app pub date -
Feb 4, 2011
filing date -
Feb 8, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An electric fan is provided, including a labyrinth structure with increased performance of preventing entry of a liquid into a receiving space to receive a stator and a rotor. A clearance is defined between an opposed wall portion of a base and an opposed wall portion of an impeller body, which are opposed to each other in an axial direction of a rotary shaft, to form a labyrinth structure. The opposed wall portion of the base and the opposed wall portions of the impeller body are shaped to form a volume expanding portion within the clearance. The volume expanding portion is constituted from a groove portion for expanding the clearance, having a volume larger than other portions within the clearance.
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