SU1574852A2 - Noise silencer - Google Patents

Abstract

The invention improves efficiency by preventing frosting. Exhaust air enters through pipe 1 into the first resonant chamber 3, where it expands, speeding up and reducing the sound level, the latter being further reduced due to absorption by the porous material with varying degrees of porosity of the hemispheres 5,6. Further, the air through the holes 11 enters the second resonant chamber 4, where the process is repeated, and then through the holes 12 is emitted into the atmosphere. With adiabatic expansion of air to a negative temperature, the moisture contained in it goes into a solid state. The ice particles due to the presence of the holes 11, 12 are removed from the chambers 3.4 of the silencer by the air flow. Thermal insulating linings 13,14 prevent the heat exchange of the cold surfaces of spherical chambers 3,4 with warm outdoor air. 1 hp f-ly, 2 ill.

Description

(61) 1216383

(21) 4406008 / 25-06

(22) 04/08/88

(46) 06/30/90. Bul No. 24

(71) Central Research and Development and Design Institute for the Prevention of Pneumoconiosis and Safety

(72) C. A. Kuryshev and V. S. Goudov

(53) 621.43.06 (088.8)

(56) USSR Author's Certificate No. 1216383, cl. F 01 N 1/08, 1986.

(54) NOISE SILENT

(57) The invention makes it possible to increase efficiency by preventing frosting. The exhaust air flows through the pipe 1 into the first resonant

chamber 3, where it expands, loosing speed and reducing the sound level, the latter being further reduced due to absorption of hemispheres 5, 6 with varying degrees of porosity by the porous material. Next, air passes through holes 11 to the second resonant chamber 4, where the process is repeated, and then through holes 12 is emitted into the atmosphere. With adiabatic expansion of air to a negative temperature, the moisture contained in it goes into a solid state. The ice particles due to the presence of the holes 11, 12 are removed from the chambers 3, 4 silencer by the air flow. Heat insulating claddings 13, 14 prevent the heat exchange of the cold surfaces of the spherical chambers 3. 4 with warm outdoor air. 1 з п. Ф-лы, 2 Il.

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The invention relates to the field of engineering, in particular to the mufflers of the aerodynamic airflow noise of pneumatic machines.

The aim of the invention is to increase efficiency by preventing frosting.

FIG. 1 shows a longitudinal section of a noise silencer; in fig. 2 shows section A-A in FIG. one.

The silencer comprises a pipeline 1 provided with at least one row of through-holes 2, and a first resonant chamber 3 placed on the pipeline 1 coaxially with the latter and surrounding the opening 2.

The silencer is provided with a second resonant chamber 4 placed on conduit 1 coaxially with the latter and enclosing the first resonant chamber 3, the resonant chambers 3, 4 being spherical and placed on the pipeline 1 with axial displacement, and the spheres of the resonant chambers 3, 4 are formed by hemispheres 5, 6 and 7, 8 with different permeabilities, installed with the help of glands 9 and 10 and a thread made on the surface of the pipeline 1. The first 3 and second 4 resonant chambers are equipped with exhaust openings 11, 12, made on their false sides and areas of the pipeline 1, and an outer insulating lining 13, 14.

The exhaust holes of each resonant chamber 3, 4 can be placed evenly around the circumference of the axis of the pipeline 1.

The muffler works as follows

Exhaust air flows through pipe I into chamber 3, where it expands, speeds up and reduces sound level, the latter being further reduced due to absorption of hemispheres 5, 6 with varying degrees of porosity 5, 6. Next, air passes through holes 11 into the second resonant chamber 4, where the process is repeated, and then the air is vented through the openings 12 to the atmosphere. With adiabatic expansion of air to a negative temperature, the moisture contained in it goes into a solid state. The ice particles due to the presence of the holes 11, 12 are removed from the chambers 3, 4 of the silencer by the air flow. The arrangement of the holes 11, 12 diametrically opposite and in the zones of the pipeline 1 leads to pre-cooling of the air entering the muffler due to heat exchange with adiabatically expanded cold air. When the openings 12 of the chamber 4 are evenly distributed around the circumference and in the area of the pipeline 1, the heat exchange is maximal, since in this case the air coming out of the silencer blows the pipeline 1 outside the outer sphere of chamber 4. The presence of heat insulating lining 13, 14 on the chambers 3, 4p prevents the heat exchange of the cold surfaces of the spherical chambers 3, 4 with the outside warm air eliminates sticking to the walls of the chambers 3, 4 and further freezing of ice particles, which provides

5 obstacle removal of the last from the muffler.

Claims (2)

1. Noise muffler autom. St. No. 1216383, 0 characterized in that, in order to increase efficiency by preventing frostbite, the first and second resonance chambers are provided with an outer insulating lining and exhaust holes made in the pipeline zone, the exhaust holes of one of the chambers located on the side opposite to the side of the exhaust holes of the other chamber. 2. The muffler according to Claim. 1, characterized in that the exhaust ports of each resonant chamber are evenly spaced circumferentially about the axis of the pipeline. five Aa ten FIG. 2