SU1386723A1 - Exhaust muffler - Google Patents

Abstract

The invention relates to engine building and makes it possible to increase the effectiveness of sound attenuation. The cone divider 9 adjoins its base with a perforated transverse partition 4, the perforation holes of which are placed outside the divider. Coaxially, the first and second pipes 6, 7 are installed in the holes on the side of the inlet, an annular gap 8 between them. changing the direction of gas movement, expansion of the gas and reduction of its velocity. 1 il.

Description

45

7, 6 L

(L

with oo

O5

 to

00

to

; The invention relates to mechanical engineering, in particular engine building, namely, to noise suppressors, preferably an internal combustion engine.

The aim of the invention is to increase the efficiency of sound attenuation.

The drawing shows the wilderness-) gel noise, longitudinal section.

The silencer contains a housing 1 on the inlet 2 and outlet 3 by the nozzle 1 at least two annular rail baffles 4 and 5, in the bore- and x partitions on the side of the inlet 2 are installed coaxially to the first 6 and the second 7 there is an annular gap 8 between them, with the first pipe 6 enclosing the secondary pipe 7 and installed with the formation of an end gap with an annular pe- rior 5.

Coaxially to housing 1 from the inlet side — joro pipe 2 is fitted with a cone-shaped separator 9, adjacent to it:) 4 is perforated, and the divider 9 is conjugated by its base with partition 4, and the last: from the dissector 9. The dissecting device 9, the partitions 4 and 5 and the pipes 6 iff 1 form expansion and rez-1ansny chambers 10 - 15. J Recommended ratios of the geometrical dimensions of the silencer are as follows:

the ratio of the diameter of the housing 1 to the diameter of the pipes 2 and 3 within 2-3;

the ratio of body length 1 (without nozzles 2 and 3) to its diameter is approximately 2.0;

the ratio of the total area of perforation holes of the partition 4 to the area of the flow area of the pipes 2 and 3 is approximately 1.2;

the ratio of the area of the annular gap 8 formed by the pipes 6 and 7 to the area of the flow area of the pipes 2 and 3 is within 1.25-1.35.

The muffler works as follows.

When the engine is operating, the exhaust gas flow through the inlet 2 enters the chamber 10, and then through the perforation holes of the partition 4 into the chamber 11 and then through the gap 8 into the chamber 12. Then the process repeats and the exhaust gases through the outlet 3 the atmosphere. In chambers 10-15, the gas expands, its velocity decreases, including due to a repeated change in the direction of motion, which ensures a reduction in the noise level.

Claims (1)

Invention Formula The silencer is predominantly for an internal combustion engine, comprising a housing with inlet and outlet nozzles, at least two annular transverse partitions and a cone-shaped divider installed by the Co-core case on the inlet side a branch pipe, the partition, adjacent to the divider, is made perforated, characterized in that, in order to increase the efficiency of sound attenuation, the cone divider its base is connected with a perforated transverse partition; the perforation holes of the latter are placed outside the divider, and in the openings of the partitions from the side the inlet pipe is installed coaxially with the first and second pipes, an annular gap between them, the first pipe enclosing the second pipe and installed to form face gap with annular partition. Compiled by V.Slavnikov Editor A.Vorovich Tehred A.Kravchuk Proofreader V.Girn to Order 1477/34 Circulation 492 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Subscription