MUFFLER Russian patent published in 2007 - IPC F01N1/24 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to device s for silencing aerodynamic noise of pneumatic equipment and compressed gas or air exhaust systems. Proposed muffler contains intake branch pipe and housing rigidly coupled with branch pipe. Housing has lower and upper covers with grooves for fixing outer cylindrical bushing made of porous material. Covers of housing are interconnected by inner cylindrical bushing by means of screw engaging with threaded part of bushing. Calibrated holes, diameter d, are made in bushing, axes of holes being square to axis of bushing. Cylindrical cup-screen is attached to upper cover of housing outside outer bushing. Ratio of height B of bushing made of porous material to diameter D of intake branch pipe lies within range of optimum values B/D=5.5-7.5. Ratio of thickness b of outer bushing made of porous material to its height B lies within range of optimum values b/B=0.06-0.1. values of clearance s between outer bushing made of porous material and cup-screen lies within range of optimum values s=(0.05-0.2)xB. Outer cylindrical bushing is made of cerement, porosity degree lying within range of optimum values of 30-45%.

EFFECT: increased efficiency of noise silencing.

1 dwg