Main silencer for air exhaust system of automotive engine

Abstract

The invention proposes a main silencer for an air exhaust system of an automotive engine, which comprises a barrel body, an air inlet pipe, an air exhaust pipe, a medium-voltage cavity A, a low-voltage cavity B and a high-voltage cavity C; the barrel body consists of an inner barrel body, a first grid layer, a second grid layer and an outer barrel body; the first grid layer and the second grid layer are mutually crossed in a grid manner and are clamped between the inner barrel body and the outer barrel body in a two-layer superposition manner; a ventilation and drainage hole is arranged on the inner barrel body; and a drainage hole is arranged on the outer barrel body. The main silencer can prevent direct impact caused by high temperature and high pressure gas to the outer wall of the outer barrel body, reduce the vibration, the radiation noise and the effect on indoor comfort and simultaneously prevent the water accumulation generated in the inner barrel body to prevent a clapboard, an end cover, the air inlet pipe and the air exhaust pipe from being corroded by the water accumulation. Therefore, the comfort of the entire main silencer is improved, the maintenance cost of a user is saved, and the service life of the main silencer is greatly improved.

Description

technical field [0001] The invention relates to an automobile component, in particular to a main muffler on an automobile. Background technique [0002] The main muffler is an important part of fuel or gas vehicles, mainly to eliminate exhaust noise. The traditional main muffler includes air intake pipe, cylinder body, partition, end cover, exhaust pipe and muffler cotton. The cylinder body is made of one or two layers of overlapping stainless steel plates, and the front and rear ends of the cylinder Sealed by the end cover, the interior of the cylinder is divided into several chambers of different pressures by a plurality of partitions with holes. The chambers can be divided into high-pressure chambers, medium-pressure chambers and low-pressure chambers. The high-pressure exhaust gas discharged from the engine enters the inner cavity of the barrel through the intake pipe, and the air flow passes through the high, medium and low pressure chambers and the sound-absorbing cot...

AI Technical Summary

Problems solved by technology

And because the exhaust gas discharged from the engine contains a large amount of S, N and other elements, after condensation, it will easily form weak acid to corrode the internal metal and make the muffler cotton lose its muffler effect, resulting in the main muffler being corroded and invalid

At the same time, when the high-temperature and high-pressure exhaust gas from the air inlet just enters the inner cavity of the main muffler, the pressure of a certain cavity in the main muffler instantly increases several times, dozens of times or hundreds of times to form a high-pressure cavity, causing the main muffler barrel The body vibrates and the temperature of the cylinder rises rapidly, resulting in vibration and radiation noise. The high-temperature cylinder will also heat the body and increase the temperature in the cab; this will not only increase the maintenance cost of the user, but also affect the comfort of the vehicle. Sex, and greatly reduce the service life of the main muffler

At home and abroad, some manufacturers prolong the service life of the main muffler by using corrosion-resistant materials, and increase the heat insulation board of the main muffler to improve comfort, but this will greatly increase the production cost of the muffler, and it cannot completely solve the problem; Some adopt siphon tube and labyrinth drainage structure. Due to the high precision of the process, it is difficult to manufacture, and it will also increase the production cost, so it is difficult to popularize and use.

Moreover, these methods have no effect on reducing cylinder vibration and radiated noise

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