RU2234612C2 - Small-size engine muffler - Google Patents

Abstract

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: proposed muffler for multipurpose small-size internal combustion engine is furnished with at least one plate placed between branch pipe, connecting flange and muffler housing to form air spaces between branch pipe and plate, air spaces being connected with inlet of gas outlet channel. Number of air spaces corresponds to number of cantilever-mounted masses of muffler housing. Muffler is furnished also with additional supports rigidly connecting plate and branch pipe through air space. Plate is made of damping material, and branch pipe is made of heat resistant material.

EFFECT: increased strength, improved efficiency of noise damping and increased service life of muffler.

2 cl, 5 dwg

Description

The invention is intended for use in an internal combustion engine, especially in small multi-purpose engines.

A well-known engine silencer comprising a nozzle with a gas outlet channel, the inlet of which is connected to the combustion chamber through a connecting flange, and the outlet is connected to the atmosphere through a silencer housing located cantilever to the nozzle (AS USSR No. 496374, class F 01 N 7/08 , publ. 1976) - prototype.

The disadvantages of the known silencer are frequent breakdown of the pipe due to varying in frequency and amplitude of oscillations of the cantilever masses. The pipe is made equally strong in all directions, while during engine operation, sections of the walls are loaded towards these masses. A low level of sound attenuation, since the gas outlet channel in the pipe section does not have means to suppress exhaust noise. In addition, the silencer vibration level is increased.

The engine is designed for work in machines for various purposes (power plant, mini-tractor, car, compressor station, etc.) and must be protected from different types of vibrations.

The objective of the proposed technical solution is to increase strength, increase the efficiency of damping exhaust noise and increase the life of the muffler.

This object is achieved in that the silencer of a universal small-sized internal combustion engine containing a nozzle with a gas outlet channel, the inlet of which is connected through the connecting flange to the combustion chamber, and the outlet - with the atmosphere through the silencer cantilever relative to the nozzle, is equipped with at least one plate, located between the pipe, the connecting flange and the silencer body in such a way that cavities are formed between the pipe and the plate, the number of which with sponds to the number of masses cantilevered arranged muffler housing, the cavities are connected to the input of gas venting channel, a plate made of damping, and a refractory nozzle materials. In addition, the silencer is equipped with additional supports rigidly connecting the plate and pipe through the cavity.

The invention is illustrated by drawings.

In Fig.1 shows a General view of a small internal combustion engine in section; figure 2 shows a section along aa; figure 3 shows a view of I on an enlarged scale; figure 4 shows a section along aa. The plate and pipe are locally connected by additional supports through a pocket and made of different material; figure 5 shows a view I on an enlarged scale. The plate and pipe are locally connected by additional supports through the cavity. The arrows in the drawings show the direction of movement of the exhaust gas.

The combustion chamber 1 through the valve system 2 is connected to the inlet of the muffler - the gas outlet channel 3. The inlet of the gas outlet channel 4, located at the beginning of the pipe 5, is connected to the combustion chamber, and the outlet 6 through the muffler 7 is connected to the atmosphere. The silencer body is connected to the nozzle 5 and has two cantilever masses 8 relative to it, which define the silencer cavities and are performed depending on the operating conditions of the unit and the required amount of noise suppression. The pipe and the silencer body 7 are connected to the cylinder-piston group through a connecting flange 9. Inlet flange 10 has inlet channels 10 connecting the inlet of the gas outlet channel 4 with two cavities 11 formed by the walls of the pipe 5 and the plates 12 located between the pipe, the connecting flange and the silencer body. The cavities 11 are made in the direction of the cantilever masses 8. To suppress the noise, one cavity is enough made in the direction of the cantilever masses, but the greatest effect is achieved when the cavity or cavities are located around the nozzle. Figure 2.4 shows two cavities formed by two plates for ease of manufacture. In addition, the number of plates depends on the manufacturing technology of the cavities.

The muffler is equipped with additional supports 13, rigidly connecting the plate and pipe through the air cavity. The pipe 5 is made of heat-resistant material, and the plate is made of damping.

The device operates as follows.

The valve system 2 opens the gas outlet channel 3, the piston displaces the exhaust gas from the combustion chamber 1 through the pipe 5 and the silencer housing 7 into the atmosphere. The sound wave moves along with the gas flow. Part of the gas at the entrance of the gas outlet channel 4 through channels 10 enters the cavity 11, creating a turbulent movement. The entrance to the cavity 11 is simultaneously the exit. This allows you to dampen the energy of noise and vibration of the main gas stream. In this case, the sound wave passing through the cavity 11 is attenuated. Supports 13 increase turbulence in pockets and further reduce exhaust noise.

The universal small-sized engine is designed for work in machines for various purposes, which creates alternating signs of varying amplitude and frequency on the muffler body 7 with different executive bodies. These vibrations are transmitted to the cantilever mass 8, causing the silencer body 7 to oscillate relative to the nozzle 5. The plates 12 strengthen the structure, playing the role of stiffeners, and additional supports 13 connect the nozzle 5 to the plates 12, increasing the rigidity of the structure.

The plates 12 dampen the vibrations due to the damping material, and the nozzle 5, made of heat-resistant material, is not subject to burning out from sparks falling from the combustion chamber 1 and overheating from the operation of the unit.

The inventive design allows to increase the strength of the pipe due to the introduction of additional support in the direction of the console located masses. The introduction of means to suppress the noise of the exhaust gas (air cavities with supports) in place of the pipe improves noise suppression. The implementation of the plate of the damping material allows to reduce vibration. The manufacture of the nozzle from a heat-resistant material protects it from overheating and sparks from the combustion chamber during engine operation, also increases the life of the muffler.

Claims (2)

1. A silencer for a universal small-sized internal combustion engine, comprising a nozzle with a gas outlet channel, the inlet of which is connected to the combustion chamber through a connecting flange, and the outlet is connected to the atmosphere through a silencer casing, cantilever relative to the nozzle, characterized in that it is provided with at least one plate located between the pipe, the connecting flange and the silencer body so that cavities are formed between the pipe and the plate, the number of which corresponds to the number of cantilever masses of the silencer body, while the cavities are connected to the inlet of the gas outlet channel, the plate is made of damping, and the pipe is made of heat-resistant material. 2. The muffler according to claim 1, characterized in that it is equipped with additional supports rigidly connecting the plate and the pipe through the cavity.

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