RU1774036C - Exhaust muffler of internal combustion engine - Google Patents

Description

1

(61) 1726797

(21) 4807767/06

(22) 04/02/90

(46) 11/07/92. Bul.No 41

(75) D.I. Livshits and P.I. Kravchuk

(56) 1. USSR copyright certificate Mg 838097, cl. F 01 N 1/08. 1978.

2. USSR copyright certificate No. 1726797, cl. F 01 N 1/08, 02.28.90.

(54) INTERNAL COMBUSTION ENGINE EXHAUST NOISE MUFFLER

(57) Summary of the invention: the silencer comprises a housing 1 with nozzles 2 and 3, divided into chambers 4-7 by partitions 8-10. In the peripheral openings

partitions 9 are strengthened by tubes 11, swirls 12, 13 are installed in partitions 8, 10, and chamber 6 is connected to chamber 5 by a central tube 14, the inlet end of which is perforated. An annular transverse baffle 15 is installed in the chamber 6, a disk reflector 16 is placed concentrically to it at the inlet end of the tube 14. The baffle 15 and the baffle 16 can be hollow, and their end walls from the side of the pipe 2 are gas permeable, with the cavity of the baffle 15 and the baffle 16 can be filled with sound-absorbing material 17, which can be used as a granular catalyst. 3 C.p. 5 ill.

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The invention relates to the field of mechanical engineering, in particular engine manufacturing, in particular to silencers of exhaust emissions of an internal combustion engine, and is an improvement of the known silencer described in USSR author's certificate No. 1726797.

Known silencer exhaust noise of an internal combustion engine containing a cylindrical body with inlet and outlet pipes, divided into inlet, outlet and central chambers by partitions 1.

A disadvantage of the known Muffler is low toxicity reduction efficiency.

A noise muffler is also known, comprising a cylindrical body with inlet and outlet nozzles, divided into inlet, outlet and central chambers by baffles, in the peripheral holes of the middle baffle there are tubes with beveled exhaust ends facing bevels towards the center of the chamber, inlet and outlet are installed in extreme baffles slotted swirlers facing the flow, and the inlet chamber is connected to the outlet chamber by a central tube, the inlet end of which is located in the partition. The ratio of the passage area of the central tube to the sum of the passage sections of the peripheral tubes is 3: 7, the slotted swirlers are made in the shape of a cone, the peripheral tubes are made of different heights, and the inlet end of the central tube is perforated. A transverse baffle is mounted coaxially to the annular central chamber; a disk reflector is placed concentrically on the input end of the central tube. The disk reflector can be made with a diameter exceeding the diameter of the hole of the annular partition 2.

A disadvantage of the silencer is the low efficiency of sound attenuation and the reduction of toxicity of exhaust gases.

The aim of the invention is to increase the efficiency of sound attenuation and purification of exhaust gases.

This goal is achieved in that the annular transverse partition and the disk reflector are hollow, and the end walls of the annular transverse partition and the disk reflector are gas permeable on the inlet side, and the cavities of the annular partition and the disk reflector can be filled with sound-absorbing material, which can be granular catalyst used.

In Fig, 1 shows the proposed silencer, longitudinal section; figure 2 is a section aa in figure 1; in Fig.Z - section bB in Fig.1; figure 4 is a section bb in figure 1; figure 5 - node I in figure 1.

The noise suppressor comprises a cylindrical housing 1 with inlet 2 and outlet 3 nozzles, divided into inlet 4, exhaust 5 and central 6, 7 of the chamber by partitions 8-10. In the peripheral openings of the middle partition 9, tubes 11 are fastened with beveled outlet ends facing with bevels to the center of the chamber 7, inlet 12 and outlet 13 are installed inlet 12 and outlet 13 slotted swirls facing the flow, and the chamber 6 is connected to the outlet chamber 5 of the central tube 14, the input end of which is located in the partition 9, and the ratio of the area of the passage section of the tube 14 to the sum of the passage sections of the peripheral tubes 11 is 3: 7, slotted swirlers 12 and 13 are made in the form of a cone, peripheral e tubes 11 are of different heights, and the input end of the central tube 14 is perforated. A coaxial annular transverse partition 15 is installed in the central chamber 6, a disk reflector 16 is concentric with it at the inlet end of the central tube 14. The disk reflector 16 can be made with a diameter exceeding the diameter of the hole of the annular partition 15. The annular partition 15 and the disk reflector 16 can be made hollow, and their end walls from the side of the inlet pipe 2 are gas-permeable, and the cavities of the partition 15 and the reflector 16 can be filled with sound-absorbing material 17. as It may be used particulate catalyst.

Silencer works as follows.

Engine exhaust gas enters the chamber 4, where it expands and, passing through the swirl 12, is concentrated in a ring-shaped cross-sectional flow. When interacting with an annular partition 15, the gas flow loses part of the kinetic energy and changes its direction, then moving partially through the central hole in the partition 15 and partially through the sound-absorbing material 17, which is filled with the partition 15. After passing through the partition 15, the exhaust gases collide with a hollow disk 16, change direction again and through

Claims (4)

the tube 11, the ejection holes of the tube 14, the slit swirler 13, enter the outlet chamber 5, where they are discharged through the nozzle 3. When the direction of the flow of gases passing through the muffler changes, the aerodynamic noise is effectively suppressed, the toxicity of the exhaust is significantly reduced due to the presence of sound-absorbing material 17 made of granular catalyst, while the aerodynamic resistance increases slightly. While reducing the efficiency of the granular catalyst, it is provided for its replacement after the flange connections are connected 13. The claims 1. The silencer of the exhaust exhaust of an internal combustion engine according to auth.St. Mg 1726797, characterized in that Aa FIG. 2 B-B Figl to increase the efficiency of noise suppression and exhaust gas cleaning, the annular transverse baffle and the disk reflector are hollow, and the end walls of the annular transverse baffle and the disk reflector from the inlet pipe side are gas permeable. 2. The muffler according to claim 1, about l and ch and yuy and - with the fact that the cavity is annular transverse 0 partition is filled with sound-absorbing material. 3. A muffler according to claims 1 and 2, characterized in that the cavity of the disk reflector is filled with sound-absorbing material. 4. A silencer according to claims 1 to 3, characterized in that the sound-absorbing material is made in the form of a granular catalyst. 5-5 Fig.Z FIG. 5