Axial flow fan with brushless direct current motor
First Claim
1. An axial flow fan, comprising a brushless direct current motor, a hub mounted to a rotating shaft of said motor, a plurality of blades mounted to said hub, and a fan housing covering said blades while holding the motor therein, whereinsaid blades have an axial height relative to a lower surface of said fan housing which is higher than an axial height of an upper surface of said fan housing relative to the lower surface of said fan housing, with a leading surface of said blades being placed outside the upper surface of said fan housing at a position higher than the upper surface of the fan housing by a predetermined projection height, wherein the number of said blades is eight, and wherein an outer diameter of the blades is 86±
- 0.5 mm, while an inner diameter of the blades is 35±
0.5 mm, with a front leading distance of the blades being 14.0±
0.4 mm and a rear trailing distance of the blades being 4.94±
0.4 mm.
1 Assignment
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Accused Products
Abstract
An axial flow fan with a BLDC motor for electronic appliances is disclosed. The axial flow fan of this invention is optimally designed in axial height of both the blades and the fan housing, the number of blades, diameter ratio of the inner diameter to the outer diameter of the blades, camber ratio, pitch angle and sweep angle of the blades. The blades have an axial height higher than that of the fan housing, with a leading surface of the blades being placed outside the surface of the fan housing at a position higher than the surface of the fan housing by a predetermined projection height, thus increasing an air volume of the fan. In addition, the number of the blades is eight, with a diameter ratio of the inner diameter to the outer diameter of the fan being 0.40˜0.45, thus reducing operational noise of the fan.
29 Citations
5 Claims
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1. An axial flow fan, comprising a brushless direct current motor, a hub mounted to a rotating shaft of said motor, a plurality of blades mounted to said hub, and a fan housing covering said blades while holding the motor therein, wherein
said blades have an axial height relative to a lower surface of said fan housing which is higher than an axial height of an upper surface of said fan housing relative to the lower surface of said fan housing, with a leading surface of said blades being placed outside the upper surface of said fan housing at a position higher than the upper surface of the fan housing by a predetermined projection height, wherein the number of said blades is eight, and wherein an outer diameter of the blades is 86± - 0.5 mm, while an inner diameter of the blades is 35±
0.5 mm, with a front leading distance of the blades being 14.0±
0.4 mm and a rear trailing distance of the blades being 4.94±
0.4 mm. - View Dependent Claims (2, 3, 4, 5)
- 0.5 mm, while an inner diameter of the blades is 35±
Specification