SOUND-INSULATING ENCLOSURE OF PROCESS EQUIPMENT Russian patent published in 2017 - IPC G10K11/00 

FIELD: machine engineering.

SUBSTANCE: sound-insulating enclosure is produced in the form of a rectangular parallelepiped enclosing the process equipment. The process equipment is installed on the vibration isolating supports, which are based on the floor of the building. A gap is made between the base of equipment and a cut in the lower edge of the rectangular parallelepiped to prevent transmission of vibrations from the equipment to the sound-insulating enclosure. Ventilation channels are made in a sound-insulating guard to prevent equipment overheating. The inner walls of the ventilation channels are treated with a sound-absorbing material and an acoustically transparent material of "Poviden" type. A sound-absorbing element in the form of smooth (14) and perforated (15) surfaces is fixed on the inner surface of the sound-insulating enclosure between which a multilayer sound-absorbing structure is placed, which represents alternation of solid (16) sections and hollow (17) sections. The solid sections (16) are formed by smooth prismatic surfaces (18) located perpendicularly to the smooth (14) and perforated (15) surfaces and fixed to the smooth surface, and by two inclined, relatively smooth prismatic surfaces (18), the surfaces (19) of complex shape having smooth surface on one side and toothed or wavy surface on the other side. The relief sound-absorbing elements (14) are attached to the smooth surface, for example in the form of the tetrahedra. Material based on aluminium-containing alloys is used as sound-absorbing material which is filled with titanium hydride or air with a density in the range 0.5…0.9 kg/m³ with compressive strength within 5…10 Mpa, and strength on a bend within 10…20 Mpa, for example, aluminium foam or basalt-based mineral wool of Rockwool type, or mineral wool of URSA type, or basalt wool of P-75 type, or glass wool with glass felt lining, or foamed polymer, for example, polyethylene or polypropylene. The material of the perforated surface is made of hard, decorative vibration cushioning materials, for example plasticate of "Agate", "Antivibrit", "Shwim" type. The inner surface of the perforated surface, facing the sound-absorbing structure is faced with the acoustically transparent material, for example, the glass fiber of EZ-100 type or the polymer of "Poviden" type. The hollow sections are filled with the sound-absorbing material, for example, with the construction foam. The structure of the sound-absorbing element is made with the resonance inserts (21) and (22) located in the smooth prismatic surfaces (18) of solid sections (16) connected to the layer (17) made of foamed sound-absorbing material by means of resonance holes (23) and (24) performing functions of Helmholtz resonator necks. The frequency band for damping the sound energy of a multilayer sound-absorbing structure is determined by the diameter and the number of resonant holes (21) and (22).

EFFECT: improved noise silencing efficiency.

2 dwg