| 摘要 |
An active noise control device for a blower according to the present invention is mounted in an inner pipe formed on the front end or the rear end of a blowing fan of the blower to be parallel to a fluid flowing direction, wherein the blower includes a blower housing with the internal blowing fan, and an intake unit duct and a discharge unit duct joined to the front end and the rear end of the blower housing, respectively. The active noise control device for a blower includes: a speaker unit emitting interfering sounds interfering with noise generated in a noise source and reducing the noise; a speaker housing receiving the speaker unit; a speaker fixing flange joined to the rear part of the speaker housing and fixing and supporting the speaker unit received in the speaker housing with the speaker housing; a first microphone embedded in the central part of the speaker fixing flange between the speaker housing and the noise source and generating noise signals corresponding to the noise; a speaker housing cap joined to the front end of the speaker housing; a second microphone embedded into the central part of the speaker housing cap and generating error signals corresponding to the noise remaining after the interference of the interfering sounds; a signal processing unit received inside the speaker housing or the speaker housing cap, generating interfering signals corresponding to the interfering sounds based on the noise signals and the error signals, and providing the interfering signals for the speaker unit; and a supporter connecting a part of the speaker housing and a part of the blower. |
