MULTI-SECTION SILENCER Russian patent published in 2018 - IPC F01N1/04 

FIELD: acoustics.

SUBSTANCE: invention relates to the noise suppression equipment. Muffler comprises a cylindrical body, end inlet branch pipe rigidly connected to central tube having perforation and together with the housing forming by means of perforated partitions in the form of at least one additional perforated pipe coaxially arranged to the housing and ends of all pipes are rigidly connected to housing by means of solid partitions, wherein one of them is rigidly connected with inlet branch pipe, and the other is located in the opposite side to the side, the sound-absorbing element is located between the body and the perforated tube and in the end part of the central tube there is a sound-absorbing element fixed by a lock washer. Sound-absorbing element overlapping the openings in the end part of the central pipe comprises a frame made in the form of perforated walls, between which there are layers of sound-absorbing material, housing is made in the form of two outer perforated walls and an inner, middle wall, made in the form of a membrane resonant plate, between which are layers of sound absorbing material, the frame is made symmetrical with respect to the middle wall, which divides it into two congruent parts, each of which has three layers of sound-absorbing material, and more rigid, first layers are made solid, profiled and fixed respectively on the outer perforated walls, second layers, softer than the first ones, are made intermittent and located with a gap in the focus of the sound reflecting surfaces of the first layers, the second layers have a rotation body shape in the form of cones connected by bases. Third layers are made of foamed sound-absorbing material in the form of a construction sealing foam and are located in the gaps and voids, which are formed between the first and the second layers, each of the outer perforated walls is rigidly connected to the corresponding second layer by means of vertical fastening elements perpendicular to it, made in the form of plates, one end of which is rigidly fixed to the outer perforated wall, and the second end is made in the form of clamps covering the rods respectively and tightening them with screws, while the rods are made parallel to the perforated walls, and the middle wall, made in the form of a membrane resonance plate, is rigidly connected to the frame by means of a construction sealing foam located in the gaps and voids of the frame.

EFFECT: higher efficiency of noise suppression.

1 cl, 2 dwg