FAN NOISE REDUCING DEVICE AND FAN NOISE REDUCING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a fan noise reducing device and a fan noise reducing method simultaneously reducing noise on an upstream side and on a downstream side of a fan while enabling to design the device configuration relatively simple and compact. SOLUTION: An intake air duct 3 and a delivery duct 4 of an axial fan 2 are divided by a partition wall 30. Each duct is arranged in both sides of the partition wall in parallel and at least a part of the partition wall is formed out of flexible film 40 and a flat speaker 50. Fan noise in each duct is canceled by sound wave interference of the intake air duct and the delivery duct via the flexible film and fan noise in each duct is simultaneously attenuated by vibration or generated sound of each surface of the flat speaker. COPYRIGHT: (C)2006,JPO&NCIPI