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1. 发明授权

US06666660B2 Motor-fan assembly for a floor cleaning machine 失效
公开(公告)号：US06666660B2
公开(公告)日：2003-12-23
申请号：US09844009
申请日：2001-04-27
申请人： Steven W. Kegg , James R. Nero
发明人： Steven W. Kegg , James R. Nero
IPC分类号： F04B3906
CPC分类号： F04D29/663 , F04D29/281
摘要： A motor-fan assembly for a floor care appliance having an improved working air fan for increased performance and noise reduction, a working air fan housing cover having a plurality of spiral shaped grooves, and a motor cooling air fan housing cover with slot shaped vent openings for increased cooling performance. The working air fan has a larger number of blades as compared to conventional fans wherein the blades are of two different lengths arranged in an alternating pattern circumferentially on an annular shaped disc. The blades are spaced closer together to prevent the passage of debris between adjacent blades and also to reduce flow noise. The passage between the edges of the fan blades and the working air fan cover has been widened and made uniform to aid in the passage of debris over the top of the working air fan. The spiral shaped grooves on the working air fan cover breaks the circulation patterns of the working airflow into smaller re-circulation patterns to reduce noise generated in the working air cavity. The slot shaped vent openings in the motor cooling air fan cover are oriented as close as possible to being parallel to the resultant direction of the motor cooling air exiting the motor housing through the vent openings to minimize drag and improve cooling efficiency.

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