CORRUGATED TUBE SHAPED NOISE SILENCER Russian patent published in 2007 - IPC F01N1/00 

FIELD: processes and equipment for noise suppressing, possibly noise silencers.

SUBSTANCE: noise silencer includes housing in the form of corrugated tube having inlet and outlet openings; insert arranged with gap relative to inner surface of housing and having shape similar to that of housing. In zones of minimum surface area of cross section of gap perforated rings are mounted. Said rings are made of rigid porous sound absorbing material such as foamed aluminum, cermet or metallo-porolon or shelly stone with porosity degree in range of optimal values 30 - 45%. Surfaces of gap are covered with sound absorbing material in the form of plate of basalt base mineral wool or mineral wools of other types or basalt wool or glass wool faced with glass felt or foamed polymer such as polyethylene or polypropylene. Sound absorbing material is faced along it whole surface with acoustically transparent material such as glass cloth or "Poviden" type polymer.

EFFECT: improved noise suppressing efficiency.

2 dwg