MUFFLER Russian patent published in 2007 - IPC F01N1/00 

FIELD: mechanical engineering.

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 lower and upper covers with grooves for fixing outer cylindrical bushing made of porous material. Covers of housing are interconnected by means of inner cylindrical bushing and screw engaging with threaded part of bushing. Calibrated holes of diameter d are made in inner bushing, axes of holes being square to axis of bushing. Holes, diameter are made in outer cylindrical bushing made of porous material so that their axes do not coincide with axes do not coincide with axes of holes, diameter d. Ratio of height B of bushing made of porous material to diameter D of intake branch pipe is within range of optimum values B/D=5.5-7.5. Ratio of diameter d of calibrated holes of inner bushing to diameter of outer bushing is within range of optimum values Ratio of thickness b of outer bushing made of porous material to its height B is within range of optimum values b/B=0.05-0.1. Outer bushing is wrapped with layer of glass cloth from outside.

EFFECT: increased efficiency of noise silencing.

4 cl, 1 dwg