What is the internal structure of the exhaust exhaust muffler？

Automobile exhaust exhaust muffler is an important part of automobile exhaust system. This article will introduce the internal structure of automobile exhaust exhaust muffler.

This article contains the following:

• The main structure of automobile exhaust exhaust muffler

• Environmental protection requirements of automobile exhaust exhaust muffler

• Environmental characteristics

1.The main structure of automobile exhaust exhaust muffler

According to the principle and structure of the exhaust muffler, the car exhaust exhaust muffler is divided into resistive exhaust muffler, resistant exhaust muffler and impedance compound exhaust muffler. Resistive exhaust muffler is a variety of exhaust muffler units such as expansion chamber resonance chamber and other components that are internally formed by pipeline baffles, etc., sound waves reflect and interfere during propagation, reducing sound energy to achieve the purpose of muffling. Resistive exhaust mufflers have a limited exhaust muffler frequency band, which is usually good for low and medium frequency bands, and poor for high frequency exhaust mufflers. Trucks often use resistant exhaust mufflers. Resistive exhaust mufflers mainly use sound-absorbing materials to reduce noise. The sound-absorbing materials are fixed to the inner wall of the pipeline where the airflow circulates or are arranged in the pipeline in a fixed manner. When the sound waves enter the exhaust muffler, most of the sound energy is absorbed and acts as a exhaust muffler effect. The advantage of the resistive exhaust muffler is that it can muffle the sound in a wide mid-to-high frequency range, especially for the high-frequency sound waves. The disadvantage is that it has a longer service life in high-temperature water vapor and gases that have an erosive effect on sound-absorbing materials. Shortly, it is rarely used as a car exhaust exhaust muffler. It is usually used in combination with a resistance exhaust muffler, that is, an impedance composite exhaust muffler.

2.Environmental protection requirements of automobile exhaust exhaust muffler

In recent years, with the continuous improvement of people's environmental awareness, the emission of automobile exhaust has become more and more strict, and a three-way catalytic converter has been added to the automobile emission system. Oxidizes and reduces CO, HC, NO in the exhaust gas to CO2, H2O and N2, increasing the water in the environment. Oxides generated during the combustion of the impurity element sulfur in gasoline will react with water to form corrosive media such as sulfuric acid-linked polysulfuric acid, which can easily cause dew point corrosion and stress corrosion. This instead increases the failure rate of the exhaust muffler.

3. Environmental characteristics

When the exhaust muffler is in humid air, due to the adsorption and dew condensation on the steel surface, the exhaust muffler surface will be covered with a thin water film. Although the ionization degree of water is small, it can still be ionized into H ions and OH ions , H is precipitated as H2 at the cathode to get the electrons lost by Fe, and Fe '+ is combined with OH to form Fe (OH), and then oxidized by the oxygen in the air to Fe (OH); after dehydration, it becomes FeO3, which is brown rust.

In more polluted areas, the air contains more 002 SO2 HS Ch and other gases. These gases will dissolve into the water film as an electrolyte, increase the concentration of H *, make the electrochemical reaction faster, and the corrosion intensified. In addition, when the exhaust muffler is in contact with them, it will produce corresponding compounds (such as sulfide chloride, etc.) on the surface of the steel plate. Such corrosion products will increase, which will inevitably cause the thinning erosion of the exhaust muffler shell.

In winter, anti-freeze salt (NaC) will be used on some roads in northern China; in summer, some roads abroad will be sprayed with dust-proof salt (CaCh) and will form an aqueous solution with high conductivity after melting, which will form the exhaust muffler. environment of.

If you want to buy exhaust exhaust mufflers,please contactGRWA.