TUBULAR NOISE SUPPRESSOR FOR CHANNEL FANS Russian patent published in 2016 - IPC E04B1/84 

FIELD: acoustics.

SUBSTANCE: invention relates to noise suppression. It is achieved by the fact that in tubular noise suppressor comprising housing with a rectangular cross-section, rigidly connected with end inlet and outlet nozzles, sound absorber located between housing and perforated element and an acoustically transparent material placed between perforated element and sound absorber ratio of the side C of external section of silencer housing to its length L is within optimal range of values: C/L = 0.44…1.11; ratio of side A of inner section of silencer housing to its length L is within optimal range of values: A/L = 0.25…0.9; ratio of difference of lengths of sides of outer and inner sections of silencer housing to its length is within optimal range of values: (C-A)/L = 0.192…0.21; ratio of lengths a of branch pipes to length L of silencer is within optimal range of values: a/L = 0.05…0.07; and sound absorber is made of mineral wool on basalt base “Rockwool” or “URSA” mineral wool, or P-75 basalt wool or glass wool lined with glass felt or foamed polymer, for example, polyethylene or polypropylene, sound absorbing element over its entire surface is lined with acoustically transparent material, for example, glass fiber fabric EZ-100 or polymer of "Poviden" type.

EFFECT: technical result is higher efficiency of noise suppression.

1 cl, 3 dwg