| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an air conditioner suppressing generation of discrete frequency noise while suppressing increase of broadband noise, and improving power efficiency. <P>SOLUTION: The air conditioner 1A includes a cross flow fan 4 constituting an impeller 5, and a ventilation passage 10, and having a scroll part 7A having a guide wall surface 7a guiding an air flow from the back of the impeller 5 to a blowout port 11. In the guide wall surface 7a of the air conditioner 1A, an end part on a blowout port 11 side is formed to be the same height over a whole range in an axial direction of the impeller 5, and a wall surface shape in a vertical cross-section in the axial direction of the impeller 5 is projected to the outside of the ventilation passage 10, and a wall surface shape in a cross-section orthogonal to an air flow direction in which a projection amount to the outside of the ventilation passage 10 is gradually decreased from a center part in the axial direction of the impeller 5 toward both end parts, is constituted of a curved surface which is continuous from the back of the impeller 5 to the vicinity of the end part on the blowout port 11 side and then is connected to the end part of the blowout port 11. <P>COPYRIGHT: (C)2009,JPO&INPIT |
