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1. 发明授权

US08678785B2 Ventilation fan 有权
标题翻译：换气扇
公开(公告)号：US08678785B2
公开(公告)日：2014-03-25
申请号：US12846892
申请日：2010-07-30
申请人： Sakae Nogami , Hirotsugu Yokotani , Kenji Iwamoto
发明人： Sakae Nogami , Hirotsugu Yokotani , Kenji Iwamoto
IPC分类号： F04B17/00 , F04B35/04 , F04D29/08 , F01D11/00 , F01D11/02
CPC分类号： F04D29/083 , F04D25/0613
摘要： A ventilation fan includes a rotor holder rotating around a rotation axis, an impeller cup including a plurality of blades provided on an outer circumference thereof, and a base portion arranged to rotatably support the rotor holder through a bearing portion. The base portion includes an outer circumferential wall extending upwards in an axial direction from an outer circumferential edge portion thereof. A gap defining a labyrinth structure is provided between an upper end portion of the outer circumferential wall of the base portion and a lower end portion of an outer circumferential portion of the impeller cup. A lower end portion of a cylindrical portion is located axially lower than the upper end portion of the outer circumferential wall of the base portion.
摘要翻译：通风风扇包括围绕旋转轴线旋转的转子保持架，包括设置在其外周上的多个叶片的叶轮杯和布置成通过轴承部分可转动地支撑转子保持器的基部。基部包括从其外周缘部沿轴向向上延伸的外周壁。在基部的外周壁的上端部和叶轮杯的外周部的下端部之间设置限定迷宫式结构的间隙。圆筒部的下端部位于比基部的外周壁的上端部轴向低的位置。

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