The invention provides a
rectangular array cylindrical draught fan silencer. The
rectangular array cylindrical draught fan silencer comprises a silencer
pipe body, wherein an inlet air counter flangeis arranged at an inlet end of the silencer
pipe body, an air outlet counter
flange is arranged at an outlet end of the silencer
pipe body, an air outlet variable
diameter shrinkage segment is arranged at one end of the silencer pipe body, an air inlet variable
diameter expansion segment is arranged at the other end of the silencer pipe body, and a part, between the air inlet variable
diameter expansion segment and the air outlet variable diameter shrinkage segment, of the silencer pipe body, is set as a
noise elimination straight cylinder segment. The
rectangular array cylindrical draught fansilencer is simple in structure and reasonable in design, enables inlet air to enter
noise elimination through holes in a columnar
noise elimination plate along inlet air
noise elimination channels by using the air
noise elimination channels among adjacent
noise elimination columns, and thereby achieves
noise control, controls noise below 85 decibels, reduces influence from high noise to workers,and then improves work efficiency of the workers, and furthermore can prevent that second
wind noise is caused due to the fact that the inlet air hits the noise elimination columns and guarantee noise elimination effects by using
stream guidance arcs installed at air inlet ends of the noise elimination columns.