| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner which prevents vibration of a bell-mouth and an increase in blowing noise due to the vibration of the bell-mouth, and can widen the rotation speed use range of fans.SOLUTION: An air conditioner includes: a housing, a heat exchanger, a bell-mouth 4 provided at an outlet, propeller fans 5 provided on the inner circumferential side of the bell-mouth 4, a fan motor and, at least two vibration parts 10a, 10b having attenuation characteristics and provided on the outer circumferential surface of the bell-mouth 4. When the number of nodal lines in the vibration mode of the bell-mouth 4 is n, and an arbitrary integer is m, a natural frequency of each vibration part 10 substantially matches the natural frequency in the vibration mode of the nodal lines n of the bell-mouth 4. One of the two vibration parts 10a, 10b is set within a range of {360/4/n+(360/2/n)×m}[°]±(360/4/n)[°]×25[%] in the circumferential direction of the bell-mouth 4 with respect to the other of two vibration parts 10. |
