AERODYNAMIC MUFFLER Russian patent published in 2007 - IPC F01N1/24 

FIELD: mechanical engineering; engines.

SUBSTANCE: invention relates to means of silencing aerodynamic noise of pneumatic equipment and compressed gas or air exhaust systems. Proposed muffler contains intake branch pipe and housing rigidly connected with branch pipe. Housing has branch pipe made in form of one of side covers of housing and inner cylindrical bushing rigidly connected square to side cover of housing, cylindrical bushing being coaxial with outer bushing made of porous material. 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 are made in inner bushing. Axes of calibrated holes are square to axis of bushing. Covers are provided with flanges to fix outer bushing. Ratio of length H of bushing made of porous material to its diameter D is within range of optimum values H/D=1.5 - 2.5. Ratio of diameter of calibrated holes to inner diameter d of inner bushing is within range of optimum values Ratio of thickness b of outer bushing made of porous material to its length H is within range of optimum values b/H=0.05-0.1.

EFFECT: increased efficiency of noise silencing.

1 dwg