公开(公告)号：US4165950A

公开(公告)日：1979-08-28

申请号：US825044

申请日：1977-08-16

申请人： Tadahisa Masai ,  Norio Beppu ,  Yoshio Okamoto ,  Kazutoshi Nishikawa

发明人： Tadahisa Masai ,  Norio Beppu ,  Yoshio Okamoto ,  Kazutoshi Nishikawa

IPC分类号： F04D29/30 ,  F04D29/28

CPC分类号： F04D29/282

摘要： A fan having forward-curved blades, such as a sirrocco fan or cross-flow fan, wherein the width of the outlet of an air passage between the adjacent two blades is 0.28 to 0.52 of the pitch of the blades at the inlet of the air passage, and the width of the inlet of the air passage is 0.85 to 1.2 of the width of the outlet thereof. The fan having blades of this construction has improved efficiency and reduced aerodynamic noise level in operation.

摘要翻译： 具有前弯曲叶片的风扇，例如西罗克风扇或横流风扇，其中相邻两个叶片之间的空气通道的出口的宽度为空气入口处的叶片间距的0.28至0.52 通道，空气通道的入口宽度为其出口宽度的0.85至1.2。 具有这种结构的叶片的风扇具有提高的效率和降低的操作中的空气动力噪声水平。