MULTISECTIONAL SILENCER OF KOCHETOVS Russian patent published in 2008 - IPC F01N1/24 

FIELD: mechanic.

SUBSTANCE: the invention relates to the technique of suppression of noise of compressor stations and boxes for gas-turbine engine testing. The multisectional silencer contains a base, into which an ejector is inserted perpendicularly to its axis, on the base, an equalising grid is located, connected with an adapter, on which a noise suppression unit is installed, consisting of separate sections connected in series; each of them is made of a layer of a noise suppression material with a thickness a, lined with perforated liner from the inside; the section consists of four subsections with a characterized size c, single noise suppression units are located with the set step b. The single noise suppression units consist of a hard frame designed as a cup in the profile, with a perforated side surface and a perforated bottom. In the upper part of the frame, a perforated lid is located. Inside of the frame, a rigidly fixed central rod is located, on which at least one internal partition is installed, with the possibility of fixing along the height of the central rod, forming resonance cavities between itself, the lid, and bottom of the cup; as a minimum, in one of them, noise suppression material is located, covered with acoustically transparent material. The perforation is slotted, and the coefficient of perforation of the side surface, the bottom, and the lid of the frame, and the internal partition is the same and equals 0.3 or more. The frame is made of the stainless steel or a galvanised zinc-coated sheet with a thickness of 0.7 mm, with polymeric protection decoration layer type made of Pural with a thickness of 50 mcm or Polyester with a thickness of 25 mcm. The technical result is increase in the noise suppression efficiency due to excluding the "ray effect" and noise waves penetration both along the axis of the silencer and through its walls by introducing sound absorbing materials on the acoustic wave propagation path.

EFFECT: increase in noise suppression efficiency.

3 cl, 3 dwg