公开(公告)号：WO2007140438A2

公开(公告)日：2007-12-06

申请号：PCT/US2007/070028

申请日：2007-05-31

Applicant: ROBERT BOSCH GMBH ,  STEVENS, William ,  STAIRS, Robert, W.

Inventor： STEVENS, William ,  STAIRS, Robert, W.

CPC classification number: F04D29/386 ,  F04D29/164 ,  F04D29/326

Abstract: The present invention provides an axial fan including a hub adapted for rotation about a central axis and a plurality of blades extending radially outwardly from the hub and arranged about the central axis. Each of the blades includes a root, a tip, a leading edge between the root and the tip, and a trailing edge between the root and the tip. Each of the blades defines a blade radius between the blade tips and the central axis. Each of the blades defines a decreasing skew angle within the outer 20% of the blade radius. The ratio of blade pitch to average blade pitch increases from a lowest value to a highest value within the outer 20% of the blade radius. The highest value is about 30% to about 75% greater than the lowest value.

Abstract translation: 本发明提供了一种轴流风扇，其包括适于围绕中心轴线旋转的轮毂和从轮毂径向向外延伸并围绕中心轴线布置的多个叶片。 每个叶片包括根部，尖端，根部和尖端之间的前缘以及根部和尖端之间的后缘。 每个叶片限定叶片尖端和中心轴线之间的叶片半径。 每个叶片在叶片半径的外部20％内限定了减小的倾斜角度。 叶片间距与平均叶片间距的比率在叶片半径的外部20％内从最低值增加到最高值。 最高值比最低值大约30％至大约75％。