SU1562487A1 - Ic-engine exhaust system - Google Patents

Abstract

The invention makes it possible to increase the efficiency of noise suppression, reduce energy costs for air ejection and increase fire safety by mixing exhaust gases with ejected air. The exhaust system of the internal combustion engine includes a silencer with a housing 1 equipped with inlet 2 and exhaust 3 nozzles, an ejector located in the housing 1 and having a gas nozzle 4 connected in series with each other, a mixing chamber 5 and a diffuser 6, and a line 7 for supplying ejected air. Exhaust gases through the inlet pipe 2 enter the gas nozzle 4 of the ejector, where their pressure is triggered, and enter the mixing chamber 5 with a pressure lower than the pressure of the ejected air flowing through line 7 into the annular cavity 8 and further through the perforations of the mixing chamber 5 the last. After completion of the mixing process in the chamber 5, the exhaust gases in a mixture with air enter the diffuser 6, where the pressure of the gas-air mixture is restored to atmospheric. From the diffuser 6 through the outlet 3 air-gas mixture enters the atmosphere. 1 il.

Description

The invention relates to engine building, and in particular to exhaust systems of an internal combustion engine. .

The purpose of the invention is to increase the efficiency of noise reduction, reducing energy costs for air ejection and increasing fire safety.

The drawing shows the exhaust system of an internal combustion engine, a longitudinal section.

The exhaust system includes a silencer with a housing 1, equipped with an inlet 2 and an outlet 3 nozzles, an ejector located in the housing 1 and having a gas nozzle 4, a mixing chamber 5 and a diffuser b, and a line 7 for supplying ejected air, and the mixing chamber 5 is perforated the gas nozzle 4, the mixing chamber 5 and the diffuser 6 are connected in series with each other and are installed coaxially to the housing 1 with the formation of an annular cavity. 8, the exhaust pipe 2 'is connected to the gas nozzle 4, the exhaust pipe 3 is made with a diffuser 6, and the highway! .7 for supplying ejected air is connected to the annular cavity 8. The highway 7 for supplying ejected air can be connected with both the atmosphere and with an object in the cavity of which the air pressure is lower than at-mosospheric, for example, with an air purifier hopper, a radiator, etc.

The exhaust system works as follows.

The exhaust gases from the internal combustion engine (not shown) through the inlet pipe 2 enter the gas nozzle 4 of the ejector, where their pressure is triggered, and enter the mixing chamber 5 with a pressure lower than the pressure of the ejected air entering through the pipe 7 into the annular cavity 8. The presence of a pressure differential between the cavity 8 and the mixing chamber 5 leads to the fact that the air from the cavity 8 through the hole of the perforation of the chamber 5 enters the latter and mixes with the exhaust gases. Due to the fact that the mixing chamber 5 is provided with perforation holes along the entire length, the supply of ejected air is distributed along the entire length of the chamber 5.

Thus, the area for supplying ejected air and the area of its mixing with exhaust gases increases and a gradual supply of air to the chamber 5 is carried out, which reduces the path covered by the entire mass of ejected air in the mixing chamber 5. This allows you to reduce energy costs for ~ ejection of air, as well as to reduce the noise level that occurs during the ejection process.

Sound waves from the mixing chamber 5 through the perforation holes pass into the cavity 8, and the oncoming air stream flowing from the cavity 8 into the chamber 5 does not interfere with the passage of sound waves, since the speed of the oncoming stream is less than the speed of sound. Sound waves transmitted into cavity 8 are reflected from the surface of the housing 1. As a result of superposition of direct and reflected sound waves, they attenuate, i.e. cavity 8 serves as a resonant chamber.

The pressure difference between the cavity 8 and the mixing chamber 5 prevents the exhaust gases from escaping into the cavity 8, and therefore in the housing 1 there is constantly ejected air whose temperature is atmospheric, which increases the efficiency of damping. noise emission, and also improves fire safety.

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After the mixing process in the chamber 5 is completed, the exhaust gases in a mixture with air enter the diffuser 6, where the pressure of the air-gas mixture is restored to atmospheric pressure. From the diffuser 6 (through the exhaust pipe 3, the gas-air mixture enters the atmosphere.

Claims (1)

Claim The exhaust system of an internal combustion engine, comprising a silencer with a housing provided with inlet and outlet nozzles, an ejector located in the housing and having a gas nozzle, a mixing chamber, a diffuser and a manifold for supplying ejected air, such as in order to increase the efficiency of sound attenuation, reduce energy consumption for ejection and increase fire safety, the mixing chamber is perforated, the gas nozzle, the mixing chamber and the diffuser are connected of one another and are mounted coaxially with the housing to form an annular cavity, the inlet connected with the gas nozzle outlet is integrally formed with the diffuser, and ejection manifold for supplying air is connected to the annular cavity.