RU47978U1 - INTERNAL COMBUSTION ENGINE EXHAUST SILENCER - Google Patents

Abstract

The claimed utility model of the silencer relates to technical acoustics and can be used to reduce the noise of exhaust from internal combustion engines of a car. An exhaust silencer for an internal combustion engine comprising a housing with front and rear end walls, two transverse partitions dividing the housing into three chambers: an inlet, an intermediate and an exhaust, the intake and exhaust chambers filled with sound-absorbing material, the inlet and outlet perforated nozzles, the internal sections of which located in the intermediate chamber, characterized in that on the outer side of the end wall of the inlet chamber an additional chamber is formed with a supply pipe, while s inlets are located inside the additional chamber, the transverse partition separating the inlet chamber from the intermediate formed with perforations, the inlet and outlet pipes are made non-coaxial, and the outlet is formed with the rotation of the silencer and extends outwardly through a lateral surface of its housing. According to the claimed technical solution, a prototype of a muffler was manufactured and passed road tests, which showed high acoustic efficiency and corresponds to the best world standards.

Description

The utility model relates to the field of technical acoustics and can be used to reduce the exhaust noise of internal combustion engines, in particular, automobiles.

Known exhaust silencer for internal combustion engines, described in RF patent No. 2224896, IPC 7 F 01 N 1/08 (published 02.27.2004), containing a hollow body with three transverse partitions, a central inlet pipe connecting the exhaust duct of the engine with the second camera, a coaxial pipe mounted on the transverse partitions, emanating from the first chamber and having side openings in the region of the second chamber, and a central exhaust pipe emanating from the third chamber and having side openings in the region of the fourth chamber, the first pipe connects the first chamber to the fourth, each of the three partitions has perforation, the inlet pipe has a side hole in the area of the first chamber, and the exhaust pipe has a side hole in the area of the third chamber. The disadvantage of this muffler, selected as an analogue, is its complex design and high hydraulic resistance. As a prototype, a useful model of an exhaust silencer was selected (RF certificate No. 26595, IPC 7 F 01 N 1/00, published December 10, 2002), comprising a housing with front and rear end walls, two transverse partitions, perforated coaxial inlet and outlet nozzles, while the inner slice of the inlet nozzle is made tapering in the form of a confuser, and the inlet and outlet chambers are filled

sound absorbing pad. The disadvantage of this muffler is its low noise reduction efficiency.

The problem solved by the proposed technical solution is to increase the acoustic efficiency of the muffler. This is achieved by the fact that in the exhaust silencer of an internal combustion engine comprising a housing with front and rear end walls, two transverse partitions dividing the housing into three chambers: inlet, intermediate and exhaust, inlet and outlet perforated nozzles and a sound-absorbing packing located inside the housing silencer, an additional chamber with an inlet pipe is formed on the outside of the end wall of the inlet chamber, while sections of the inlet pipes are inside the additional chamber, the pepper wall separating the inlet chamber from the intermediate one is perforated, the inlet and outlet pipes are made misaligned, and the exhaust pipe is rotated and exits the muffler through the side surface of its body. In addition, on the transverse partition separating the intermediate chamber from the outlet, a hole with a neck is made, the height of which is 0.1 ... 0.8 of the diameter of the hole.

The essence of the utility model is illustrated in figure 1. The muffler comprises a housing 1 with front 2 and rear 3 end walls, inlet 4 and exhaust 5 perforated nozzles 13 of the pipe. Inside the housing 1, two transverse partitions 6 and 7 are made, and the partition 6 is made with perforation 8. The partitions 6 and 7 divide the case into three chambers: inlet 9, intermediate 10 and outlet 11, while the cavities 9 and 11 are partially or completely filled with sound-absorbing material 12 (sound-absorbing material is not shown in cavity 9). On the outer side of the end wall 2 of the inlet chamber 9, an additional chamber 14 is formed with a supply pipe 15, while the sections of the inlet pipes 16

4 are located inside the additional chamber 14. The exhaust pipe 5 is rotated (as shown in FIG. 1, the angle of rotation of the pipe 5 is 90 °) and exits the muffler through the side surface of the housing 1.

The inlet pipes 4 and the outlet pipe 5 are made misaligned (axis α, β, γ, respectively). Additionally, the partition 7 contains an opening 17 with a neck 18, the height of which is 0.1 ... 0.8 of the diameter of the hole 17. A blown mesh, for example, of a metal wire, can be installed on the neck 18 to increase the resistance of the neck (in Fig. 1, the mesh does not shown).

The inventive muffler operates as follows. The exhaust gases come from an internal combustion engine (not shown in FIG. 1) through an inlet pipe 15 to an additional chamber 14, from which they enter the intermediate chamber 10 through the inlet pipes 4 due to the perforation of the 13 inlet pipes 4, the perforation 8 of the partition 6 and the presence sound-absorbing material in the cavity 9 (Fig. 1 sound-absorbing material in the chamber 9 is not shown) attenuation of acoustic vibrations occurs in the nozzles 4 and the intermediate chamber 10. The presence in the partition 7 of the hole 17 with the neck 18 further reduces acoustic vibrations inside the intermediate chamber 10 (the hole 17 with the neck 18 and the volume of the chamber 11 operate as a Helmholtz resonator). From the intermediate chamber 10, exhaust gases through the exhaust pipe 5 are evacuated from the silencer cavity into the atmosphere. Misalignment of inlet pipes 4 and exhaust 5 leads to a decrease in acoustic vibrations, because the exhaust gas stream does not fall directly from the exhaust pipe 4 to the exhaust pipe 5. Rotating the exhaust pipe 5, its perforation 13 and the presence of sound-absorbing material 12 also effectively reduce the energy of acoustic vibrations in the exhaust gas stream. By selecting the perforation of the nozzles 4 and 5, the partition 6 and the diameter of the hole

17 with the neck 18, as well as the choice of the volume of the silencer chambers and the type of sound-absorbing material, a highly efficient silencer with a relatively small resistance value can be designed.

A prototype of the inventive muffler was manufactured and passed road tests at Ural Automobile Plant OJSC, which, with a hydraulic resistance of 6.3 kPa, allowed to reduce the noise of the vehicle exhaust tract by 28.5 dBA, which corresponds to the characteristics of the world's best mufflers from Donaldson (USA) ) and Eberspacher (Germany).

Claims (2)

1. The silencer of the exhaust exhaust of an internal combustion engine, comprising a housing with front and rear end walls, two transverse walls dividing the housing into three chambers: inlet, intermediate and exhaust, the intake and exhaust chambers filled with sound-absorbing material, the inlet and outlet perforated nozzles, internal sections of which are located in the intermediate chamber, characterized in that on the outer side of the end wall of the inlet chamber an additional chamber is formed with an inlet pipe, wherein The entrance pipes are located inside the additional chamber, the transverse partition separating the inlet chamber from the intermediate chamber is perforated, the inlet and outlet pipes are made misaligned, and the exhaust pipe is made with rotation and exits the muffler through the side surface of its body. 2. The silencer of the exhaust exhaust of an internal combustion engine according to claim 1, characterized in that on the transverse partition separating the intermediate chamber from the exhaust, a hole with a neck is made, the height of which is 0.1 ... 0.8 of the diameter of the hole.