Air conditioner

An air conditioner, comprising:

• a blower fan to blow air;
• a blower motor to rotate the blower fan;
• and
• a blower housing comprising a blower body forming the exterior and having a cylindrical shape and a motor cover disposed at a central portion of the blower body to form a space into the blower motor is inserted, the blower housing having a ring-shaped air blowing flow passage between an inner circumferential surface of the air blower body and an outer circumferential surface of the motor cover in which air discharged from the blower fan flows,
• wherein the blower fan, comprising,
• a hub coupled with a shaft of the blower motor and extending in a direction of the air blowing flow passage with a large radius;
• a shroud spaced from the hub, extending in a direction in which the hub extends and including an inlet hole formed at a central portion thereof to receive air;
• and
• a plurality of blades disposed between the hub and the shroud,
• wherein the blower housing comprises a plurality of vanes disposed spaced from each other in a circumferential direction on the ring-shaped air blowing flow passage,
• wherein each of the plurality of vanes is formed into a bent plate shape in which a negative pressure surface thereof is convexly formed and a positive pressure surface thereof is concavely formed,
• wherein each of the plurality of vanes comprises a plurality of ribs formed on the negative pressure surface of the vane,
• wherein a height of the section of each of the plurality of ribs gradually decreases from the front end to the rear end.