一、Tube Silencer

The silencer resistance of the tubular muffler is formed by the abrupt change of the cross section of the inner tube and the action of the expansion chamber between the inner and outer tubes. It is effective for low frequency and intermediate frequency noise muffler.

The tube silencer consists of two parts: resistivity and resistance. It is mainly used to reduce the intake and exhaust noise produced by the centrifugal fan in the air system center. The rated air volume is low rated 10-15dB (A), middle rated 15-25dB (A) and high rated 15-25dB (A) respectively. For air volume 2000m3 / h-60000m3 / h (wind speed should be choosed 6-8m / s), the resistance loss of rated air flow, the average drag coefficient of 0.4.

二、Folding plate silencer

Fold-plate silencer is a new muffler with air-conditioning system, with small size, small resistance loss, large muffler,the effective length of 900mm, wind speed is 8m / s, the silencer is generally 1-2 parts.

三、Micro-perforated plate silencer

By the combination of micro-perforated plate muffler. Perforation diameter of 1mm below the thickness of 1mm or less, micro-perforation has sufficient acoustic resistance and a good sound absorption performance. By the location of the perforation rate is different, and made of double-layer micro-perforated plate, and a resonant cavity, without additional sound-absorbing material. It has muffler volume, wide frequency range, air resistance, no filler, can not afford to dust.