AERODYNAMIC NOISE SILENCER Russian patent published in 2007 - IPC F01N1/00 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to devices designed for suppression of aerodynamic noises of pneumatic equipment and exhaust systems of compressed gas or air. Proposed noise silencer contains intake branch pipe and housing rigidly connected with intake branch pipe and containing noise-absorbing members. Housing contains branch pipe made in form of one of side covers of housing to which inner cylindrical bushing is rigidly connected square to cover and coaxial to peripheral perforated bushings. Other end of inner cylindrical bushing is rigidly connected with second side cover of housing by screw engaging with threaded part of bushing. Calibrated holes, diameter d, are made in inner bushing, axes of said holes being square to axis of bushing. Space formed by perforated bushings is filled with noise-absorbing material. Ratio of length H of outer peripheral perforated bushing to its diameter D is within optimum values H/D=1.0-2.5, and ratio of diameter d of calibrated holes to inner diameter d₁ of inner bushing is within optimum values d/d₂=0.3...0.9, and ratio of thickness b of noise-absorbing member to length H of peripheral perforated bushings is within b/H=0.05-0.25.

EFFECT: improved efficiency of noise suppression.

4 cl, 1 dwg