EXHAUST SILENCER FOR INTERNAL COMBUSTION ENGINE Russian patent published in 2006 - IPC F01N1/04 

FIELD: engine engineering.

SUBSTANCE: exhaust silencer comprises three chambers defined by transverse baffles, axially aligned inlet and outlet pipes connected with the central chamber, and inner perforated inlet and outlet branch pipes which pass through the side chambers and enter the central chamber. The central chamber is hollow, and two side chambers are filled with a sound-absorbing material. The transverse baffles are perforated, and the extent of perforation of the branch pipes and baffles separating the central and side chambers and the acoustical resistance are chosen so that the resistance to flow through at least one of the side chambers filled with the sound-absorbing material, with free end of the inlet (outlet) branch pipe being plugged from the side of the central chamber, is Δp = (1,3-2.4)fLQ/F, where Δp is the resistance to the flow through the plugged chamber, Pa, Q is the volume flow rate, m³, f is the frequency of adjusting, Hz, F is the cross-section area of the inlet branch pipe of the exhaust silencer, m², and L is the length of the sections of the inlet (outlet) branch pipe arranged inside the exhaust silencer.

EFFECT: improved sound silencing.

2 cl, 3 dwg