FIELD: engines and pumps.
SUBSTANCE: silencer incorporates an oval cross-section cylindrical housing with end face walls furnished with an inlet, intermediate and outlet chambers separated by partitions, an inlet, intermediate and outlet branch pipes connecting the said chambers spaces. The intermediate branch pipe axes are shifted in the silencer crosswise section relative to the smaller central axis of the silencer crosswise section oval axis. The outlet branch pipe accommodates a concentric resonance chamber formed by a perforated section of the outlet branch pipe and a cylindrical casing enclosing the perforated section of the outlet branch pipe with a clearance. The outlet branch pipe perforated section holes area inside the resonance chamber makes, at least, 0.9 of the area of the outlet branch pipe through cross-section. The resonance chamber cylindrical space cross-section area, between the outlet branch pipe and resonance chamber cylindrical casing makes, at least, 0.9 of the outlet branch pipe through cross-section area. The outlet branch pipe perforated section is arranged on the resonance chamber outlet section so that 
, where Ldead-end is the length of the outlet branch pipe not perforated (dead-end) section inside the resonance chamber before the first row of perforated holes, Acham is the length of the larger central axis of the silencer casing (chamber) oval cross-section, ε is the degree of perforation of the outlet branch pipe perforated section, dbp if the outlet branch pipe through cross-section, ε = F per. hole / F per. bp, where Fper.hole is the total area of perforated holes of the outlet branch pipe perforated section, Pper. bp is the area of the outlet branch pipe outer surface wall limited by extreme edges of the perforation first and last rows. Proposed invention features a high-efficiency silencing, primarily at high engine rpm.
EFFECT: high-efficiency silencer.
4 dwg
