SU920141A1 - Sound-insulating module - Google Patents

Description

(54) SOUND-INSULATING MODULE

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The invention relates to building and industrial acoustics, and can be used in localizing sources of sound vibrations and in protecting people from noise for the manufacture of partitions, housings, cabins.

Sound insulated modules are known in the form of single-layer or multi-layered elements, providing sound insulation due to the mass of walls, friction losses during bending 1.

However, the increase in sound insulation in known modules is associated with an increase in mass, as well as with the use of special sealing mastics. In addition, a special ventilation system is required for air exchange in the object to be protected.

Soundproofing modules containing a multilayer system are also known: an outer plate, an intermediate layer of sound-absorbing material and a perforated inner plate, which makes it possible to ensure reliable sound insulation without mass increase 2.

However, when the device is in well-known ventilation duct modules, the sound insulation is significantly degraded.

and the use of a special silenced ventilation system requires considerable material costs.

The purpose of the invention is to provide ventilation of the volume to be enclosed with reliable sound insulation.

The goal is achieved by the fact that in the soundproofing module, which includes perforated outer plates and an intermediate layer of sound-absorbing material, the plate is formed. A ventilating channel 10 times the width of the plate is formed, and the corners of the plates are perforated at an angle 10-30 ° to the plane of the slab, the plates being interconnected by a gasket with an area of 1 / 10-1 / 20 square of the slab, and the sound-absorbing material is fixed on the inner surfaces of the plates against the 1H perforation opening and has an area equal to 1/3 -2/3 module area .

20

In addition, perforations can be formed by diffraction pulses with inclined edges in the frame.

In the drawing, the proposed module is schematically matched.

The soundproofing module consists of outer cover plates 1, HanpHiviep chipboard, absorbing layers 2 fixed on the inner sides of plates 1, and air vents 3 in the form of inclined perforations or composable diffraction gratings. Cover plates 1 are fastened together by gaskets 4 and bolts 5.

Sound insulation module works as follows.

When assembling the modules in the form of a soundproof barrier, at the junction of the modules of the plate 1 due to the shift provide a fairly tight barrier. Wood chipboard has sufficient rigidity and weight, which provides sufficient sound insulation. Air flows due to convection, through-holes or temperature differences move through the ventilation channels between the plates 1. At the same time, sound vibrations going from the outside to the inside or from the inside to the outside of the enclosing space attenuate in the narrow channels of the slit perforation 3, and then in the narrow channel with reflections and on a porous sound-absorbing layer 2.

It was established experimentally that a 20-mm-thick chipboard module with a filler made of a fire-proof biostable fibreboard with an area of 1/3 of the module's base with a width of 30 mm ventilation channel and with a circular perforation of 0 mm diameter 25 mm at an angle io to the plate diagonally At the corners of the module, the area of perforated sections is 1/6 of the area of the module; it provides reliable sound insulation (up to 30 dB at low frequencies) and good ventilation (for the case of a cabin for people) without additional power boosters.

Claims (2)

1. A sound-insulating module, comprising outer perforated plates and an intermediate layer of sound-absorbing material, characterized in that, in order to provide ventilation of the volume to be enclosed with sound insulation, a ventilation channel is formed between the plates with a width of 1-10 times the plate thickness, and the corners of the plates are perforated at an angle of 10-30 ° to the plane of the plate, and the plates are interconnected pads with an area of 1 / 10-1 / 20 of the slab area, and sound-absorbing material is fixed on the internal surfaces of the plates against the perforation holes and has an area equal to 1 / 3-2 / 3 of the module area. 2. A module according to claim 1, characterized in that the perforation is formed by a diffraction grating with inclined ribs in the frame. Sources of information taken into account in the examination 1.Yudin E. Ya. Fight against schum. M., stroiizdat, 1964, p. 18. 2. Protection from Schuma. Designer's Handbook. M., Stroyloyd, 1974, p. 53.