AIR CIRCUIT WITH ACOUSTIC TREATMENT Russian patent published in 2017 - IPC E04F17/04 E04B1/84 

FIELD: ventilation.

SUBSTANCE: air circuit with acoustic treatment is made of box sections, connected by means of lock devices. The sections are made of lightweight sound-absorbing structures containing perforated internal and external decoration, filled with a sound absorber of sound absorbing materials, the perforation coefficient of the decoration is assumed to be equal to or more than 0.25; the thickness of the sound absorber lies in the optimal range of values - 20…50 mm. The decoration is made of stainless steel or a galvanized steel sheet 0.7 mm thick with a polymer protective and decorative coating such as "Pural" 50 mcm thick or "Polyester" 25 mcm thick, or of an aluminium sheet 1.0 mm thick and coating 25 mcm thick. The decoration is made of structural materials, coated on its surface from one or both sides with the soft vibration-damping material, such as WD-17 rezin or material "Guerlain-D" type. The ratio between the thickness of the linning and the vibration damping coating is within the optimal values range - 1:(2.5…3.5). The acoustic absorber is made as rigid and perforated walls, between which the layers of sound reflecting, and sound-proof materials of different density arranged in two layers are located. Layers of the sound reflecting material are made with complex profile, out of uniformly distributed hollow tetrahedrons, ensuring reflection of sound waves incoming from all directions, and located responsively at rigid and perforated walls, and layers of the sound-absorbing material are made out of heat insulating material able to maintain the specified microclimate in room, and as the sound absorbing material soundproofing sheet material which is based on magnesia bonding material with reinforcing glass fiber or glass veil, or polyester, or a porous sound-absorbing ceramic material having a bulk density 500÷4000 kg/m³ and consisting of 100 pts. wt. of pearlite having a grain diameter 0.1÷8.0 mm, 80÷250 pts. wt. of one of the sintering of a material selected from the group consisting of fly ash, slag, silica, lava, stones or clay as the basic material, 5÷30 pts. wt. of the inorganic binder material. After sintering the mixture, perlite particles form communicating openings between their contacting surfaces so that the internal pores are in communication with each other.

EFFECT: reduction of aerodynamic and structural noise, simplification of installation and dismantling and provision of comfort in the premises.

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