'AN IMPROVED SILENCER FOR EFFECTIVELY REDUCING NOISE PRODUCED BY AC MOTORS WITH CACA ENCLOSURE WHILE IN OPERATION'

摘要

The invention relates to an improved silencer for effectively reducing noise produced by AC motors with CACA enclosure while in operation, comprising a front plate (02) detachably attachable to a fan ducting flange of the motor structure; a shaped wrapper plate (01) welded at one end to the front plate (02), a second end of the wrapper plate (01) is rigidly joined to a back flange (06); a shaped top cover (05) welded with wrapper plate (01) and back flange (06); a back cover (03) and a flange (06) assembly; a middle plate (04) for guiding air flow to the external suction fan; a glass wool slab applied on the entire internal walls of the silencer; and a perforated sheet disposed cover the glass wool slab, the perforated sheet having at least 70% open space, and the glass wool slab is selected to have minimum required density.