发明名称 |
Centrifugal fan |
摘要 |
A centrifugal fan is provided. The centrifugal fan is configured such that an impeller having a plurality of blades along a circumferential direction and disposed between a disk-shaped main plate and an annular shroud is housed in a casing configured by an upper casing and a lower casing, and that an air suctioned from a suction opening is discharged outward in a radial direction of the impeller by a centrifugal force due to a rotation of the impeller. The shroud has a curved surface formed from an outer edge portion toward a center thereof. The shroud has a plurality of protrusions which are formed on the surface of the shroud such that a gap is formed between each of the protrusion portions and the upper casing. |
申请公布号 |
US9039360(B2) |
申请公布日期 |
2015.05.26 |
申请号 |
US201213357776 |
申请日期 |
2012.01.25 |
申请人 |
Minebea Co., Ltd. |
发明人 |
Fukuda Takako;Fujimoto Seiya;Ogushi Masaki;Suzuki Yuzuru |
分类号 |
F04D17/08;F04D29/08;F04D29/18;F04D29/16;F04D29/22;F04D29/42;F04D29/40;F04D29/44 |
主分类号 |
F04D17/08 |
代理机构 |
Carrier Blackman & Associates, P.C. |
代理人 |
Carrier Blackman & Associates, P.C. ;Blackman William D.;Carrier Joseph P. |
主权项 |
1. A centrifugal fan configured such that an impeller, having a plurality of blades along a circumferential direction and disposed between a disk-shaped main plate and an annular shroud, is housed in a casing configured by an upper casing and a lower casing, and that an air suctioned from a suction opening is discharged outward in a radial direction of the impeller by a centrifugal force due to a rotation of the impeller,
wherein the shroud has a curved surface formed from an outer edge portion toward a center thereof, wherein the shroud has a plurality of protrusion portions thereon which are formed annularly and spirally on the curved surface of the shroud and arranged such that a gap is formed between each of the protrusion portions and the upper casing, and wherein a lower surface of the upper casing is faced to the top end of the protrusion portions such that each of the gaps therebetween are the same. |
地址 |
Nagano JP |