Element of kochetov silencer

FIELD: machine building.

SUBSTANCE: here is disclosed element of silencer consisting of case with flap cover. The case is filled with sound absorbing material placed in a protective shell. Walls of the case are formed with a sound absorbing structure made as cylinder perforated coaxial shells - internal and external ones. Between the shells there is installed a sound absorber made out of at least one profiled sheet. Also, profile of the sheet in cross section can be rectangular or trapezoidal.

EFFECT: improved acoustic characteristics in region of low, medium of high frequencies.

3 dwg

 

The invention relates to acoustics, in particular to a broadband and low-frequency samohlasen, and can be used in all sectors of national economy under the maximum sound attenuation functions in ventilation and air-conditioning.

Closest to the invention is an element of an exhaust silencer according to patent No. 2309266, F16L 55/02, 1970 (prototype), consisting of a mesh body, filled with sound-absorbing material, placed in a protective shell.

A disadvantage of the known solution is that it provides sound attenuation mainly at high frequencies, which does not allow to use them in areas where broadband sound attenuation, including low and infrasonic frequencies.

The technical result is an improvement of the acoustic characteristics in the low, medium and high frequencies.

This is achieved by the fact that the element of a muffler consisting of a body with hinged lid, filled with sound-absorbing material, placed in a protective casing, the casing wall is formed by a sound-proof design, made in the form of a cylindrical perforated coaxial shells - external and internal, between which is a material made of at least one shaped porous sheet, and profile sheet in the cross of the AI can be triangular, rectangular, trapezoidal, in the form of arcs of circles, sine, and as a sound absorbing material used for the heat from the basalt mineral wool, or mineral wool or basalt wool, or glass wool, and the sound-absorbing element across its surface lined with acoustically transparent material, such as fiberglass type EZ-100 or a-type polymer Povide", and as the absorbent material of the absorbent sound-absorbing structure body is used porous sound-absorbing material, such as paralumino or cermets, or metalloprotein, or material in the form of compressed crumbs from solid vibrocentric materials, such as elastomer, polyurethane.

Figure 1 shows the element of the muffler, figure 2 and 3 sound - absorbing design.

Element of the silencer consists of a housing 1 with a hinged lid 4, filled with sound-absorbing material 2, placed in a protective sheath 3.

Wall of the housing 1 is formed by a sound-proof design, made in the form of a cylindrical perforated coaxial shells - external 5 and 6, between which is located the material 7 made of at least one shaped porous sheet, and profile sheet in the cross section can be triangle is determined as being, rectangular, trapezoidal, in the form of arcs of circles, sine. Perforated coaxial sheath 5 and 6 of the housing 1 can have in cross section the shape of a triangle, polygon, ellipse, and any combination of these shapes.

As the sound absorbing material 2 used slabs of basalt mineral wool on the basis of type "Rockwool", or mineral wool of type "URSA", or basalt wool type P-75, or glass wool lined with glass wool material, or a foamed polymer, such as polyethylene or polypropylene, and an absorbent element across its surface lined with acoustically transparent material (not shown), such as fiberglass type E3 effects-100 or a-type polymer Povide".

As the sound-absorbing material of the absorber 7 is a porous sound-absorbing material, such as paralumino or cermets, or metalloprotein, or in the form of compressed crumbs from solid vibrocentric materials, such as elastomer, polyurethane, or plastic-type "agate", "Antifibrin", "Swim", and particle size of the crumb lies in the optimum range of values: 0,3...2.5 mm (not shown).

Element of the muffler works as follows.

Low-frequency absorption at the expense of membrane excitation walls of the casing and, indirectly, the inside is their volumes of air. Due to the large decrement in the material occurs the absorption of sound energy by dissipation. The transfer of sound energy into heat (dissipation, the dissipation of energy occurs in the pores of the material, which represents a model of cavities "Helmholtz", where energy losses occur due to friction oscillating with the frequency of excitation of the mass of air in the mouth cavity, the walls of the cap, having a form of an extensive network of pores of the material.

Element of a muffler consisting of a body with hinged lid, filled with sound-absorbing material, placed in a protective shell, wherein the shell is formed by a sound-proof design, made in the form of a cylindrical perforated coaxial shells - external and internal, between which is a material made of at least one shaped porous sheet, and profile sheet in the cross-section may be rectangular, trapezoidal.



 

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