AIR BLOW NOISE REDUCING DEVICE FOR AIR BLOWING PART

摘要

PROBLEM TO BE SOLVED: To realize an air blow noise reducing device which meets requirements of both noise reduction and heat-insulation maintenance and is suitable to various air blowing units. SOLUTION: Disclosed is the air blow noise reducing device for the air blowing part which reduces air blow noise by providing a resonance sound absorption part in resonance sound absorbing box structure corresponding noise characteristics unique to an air blowing passage 33 at a wall part of the air blowing passage 33, and the resonance sound absorption part is formed into noise reduction units 31 and 32 in resonance sound absorbing box structure formed by uniting an outside plates 30a which does not have a plurality of sound absorption holes 30d as a member different from the passage wall of the air blowing passage 33 and an inside plate 30b having the plurality of resonance sound holes 30d as a member different from the passage wall of the air blowing passage 33 together opposite each other. The noise reduction units 31 and 32 are incorporated as portions of the passage wall of the air blowing passage 33 to realize a small-sized air blowing unit which has high performance and high durability at low cost. COPYRIGHT: (C)2005,JPO&NCIPI