NOISE SILENCER OF EJECTION TYPE Russian patent published in 2018 - IPC F01N1/04 

FIELD: acoustics.

SUBSTANCE: invention relates to the noise suppression equipment. Muffler includes a body, a nozzle and a receiving chamber, the nozzle is conical with a cut-off diameter D and is rigidly connected by an acoustically transparent rigid element to the body to form a gap Z, the body from the inside is lined with sound-absorbing material covered with an acoustically transparent film, the housing is made of structural materials with a layer of soft vibration damping material deposited on its surface from one or both sides, the ratio between the thickness of the liner and the vibration damping coating lies in the optimal range of values – 1:(2.5…3.5), and the sound-absorbing material is made of mineral wool on a basalt basis of the Rockwool type, or mineral wool of the URSA type, or basalt wool of the P-75 type, or glass wool with a glass wool lining, or a foamed polymer, for example polyethylene or polypropylene, the sound-absorbing element being lined on its entire surface with an acoustically transparent material, for example a glass fiber of the type EZ-100 or a polymer of the "Poviden" type.

EFFECT: higher efficiency of noise suppression.

3 cl, 3 dwg