| 摘要 |
An axial flow fan includes a motor placed on a frame and including a rotor rotatable around a rotation axis. An impeller is attached to an outer circumference of the rotor to rotate around the rotation axis and includes blades for generating an air flow when the rotor rotates. A housing surrounds the impeller to form a passage for the air flow. Ribs extend from the frame to the housing, thereby securing the frame to the housing. Each rib includes an air guide face which faces the impeller. An angle of average inclination of the air guide face with respect to the rotation axis decreases in a direction away from the rotation axis. The average inclination of the air guide face is defined as inclination of a straight line approximately connecting both ends of the air guide face on a plane perpendicular to a radial direction.
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