| 摘要 |
PURPOSE: A fan guide is provided to weak the blade passing frequency and the vortex shedding of air to be inhaled by the axial flow fan for reducing the fluid noise largely, thereby resolving the problems of a cooling fan assembly of a microwave oven. CONSTITUTION: A fan guide includes at least two or more frames(112a-112c) in the shape of curve or straight line disposed to a suction side of an axial flow fan for supporting the axial flow fan and a driving motor of the axial flow fan, wherein the frames are connected to each other with different angles(β1-β3), and crossing points(P1-P3) formed by overlapping imaginary extension lines from ends of the respective frames are not accorded to one another. |
