NOISE SUPPRESSOR FOR SOCK AND STOCKING MAKING MACHINE WITH PNEUMATIC STRETCHING OF ARTICLES Russian patent published in 2017 - IPC F01N1/04 

FIELD: machine engineering.

SUBSTANCE: noise supressor has a cylindrical housing rigidly connected with end inlet and outlet branch pipes, the outlet branch pipe is made in the form of a disc having at least three holes in a peripheral part, and a central pipe having perforation in the form of rectangular slots in amount of at least three and associated with disc central solid portion, and between the housing and the central tube there is a sound-absorbing element provided so that disc openings connected to the cavity of the sound-absorbing element, and the sound-absorbing structure of inlet pipe end is in the form of cylindrical helical spring, which turns in axial section are made in the form of rigid and perforated walls, between which there are two layers: sound-reflecting layer adjacent to the rigid wall and sound-absorbing layer adjacent to the perforated wall. The layer of sound reflecting material is made of complex profile composed of evenly distributed hollow tetrahedrons allowing to reflect acoustical waves incident in all directions, and mineral wool on basalt basis is applied as a sound-absorbing material of the sound-absorbing layer.

EFFECT: improved efficiency of noise suppression.

2 dwg