Cooling fan has air guide on air inlet side of frame with curved surface, whereby diameter of exterior of air guide is greater than frame's diameter, bearing with hub seat and several ribs and blade wheel

摘要

The fan has an annular frame (20) with an air inlet side and an air outlet side, whereby at least one object to be cooled can be arranged on the air outlet side, an air guide (21) formed on the air inlet side of the frame with a curved surface, whereby the diameter of the exterior of the air guide is greater than the frame's diameter, a bearing (22) with a hub seat (221 and several ribs (222) and a blade wheel (23).