As we all know, when a vehicle is driving, the high-pressure combustion air in the engine cylinder is discharged outward, which will produce 120dB of environmental noise. In order to meet the relevant requirements of automobile exhaust environmental noise, exhaust pipe muffler is a device used to reduce exhaust environmental noise.
The main function of an exhaust pipe muffler is to reduce the exhaust ambient noise of the engine, ensuring that high-temperature exhaust gases can be safely and effectively discharged. According to the basic principles and structure of noise reduction, it can be divided into resistant silencers, resistive silencers, and impedance composite silencers. Silencers are mainly composed of various shapes and sizes of pipes and partitions combined into resonance chambers, expansion chambers, and other noise reduction devices, which reflect or interfere with sound waves in the resonance chambers and expansion chambers, thereby reducing sound energy. Its structure can be effectively made of materials such as 439M. ）Although it has the characteristics of resistance to atmospheric oxidation and corrosion, its corrosion resistance varies with the chemical composition of the steel itself, usage standards, and environmental media.
The exhaust pipe muffler belongs to high temperature, high humidity, stone damage, wet heat alternation and other parts. Long term driving of vehicles in harsh environments, especially in rainy and snowy weather, can easily cause rusting of the muffler surface.
Rust on the surface of a muffler is an objective and common phenomenon that only occurs on the surface of stainless steel plates and does not affect the functionality of the muffler. Therefore, as long as the muffler does not rust or leak during use, it can be used normally.
Therefore, when using a vehicle, you don't have to worry about discoloration and corrosion of the exhaust system muffler, because this is also an objective and common phenomenon. Absorb low-frequency environmental noise. The silencer of this utility model is appropriately arranged with sound-absorbing materials in the pipeline, and a portion of the sound-absorbing energy is absorbed. Its structure can effectively absorb medium and high-frequency environmental noise. At present, most exhaust pipe silencers use impedance composite silencers, which have impedance and impedance properties, and have good noise reduction effects on low-frequency and mid frequency environmental noise.
The muffler is mainly made of stainless steel plate, arranged under the housing, and connected to the engine. It can not only withstand high temperature air of 500 ℃~700 ℃, but also various complex environments. Long term use of car muffler equipment may result in some phenomena:
Discoloration of muffler shell
The box is made of stainless steel plate because the stainless steel plate will change color with the temperature difference. The main reason for this phenomenon is that stainless steel plates undergo oxidation-reduction reactions with oxygen in the air at high temperature standards, forming oxide films. Due to the thickness difference of the oxide film, natural light shining on the oxide film presents different color tones.
Experiments have shown that when the temperature reaches 300 ℃, stainless steel plates begin to change color, and the color tone changes with the increase of temperature, mainly manifested as light yellow, red, deep red, and black.
Due to the combination of multiple different cavities in the internal structure of the muffler, the severely discolored part is located in the high-temperature cavity of the air inlet, and the severely discolored part is located in the high-temperature cavity of the air inlet. The temperature changes greatly, so the discoloration is severe.
Secondly, the surface of the muffler is rusted.
After driving for a period of time, the surface of the muffler will rust. This is also caused by stainless steel materials such as SUH409L, SUS304, SUS436L, 439M, etc. ）Although it has the characteristics of resistance to atmospheric oxidation and corrosion, its corrosion resistance varies with the chemical composition of the steel itself, usage standards, and environmental media.
The exhaust pipe muffler belongs to high temperature, high humidity, stone damage, wet heat alternation and other parts. Long term driving of vehicles in harsh environments, especially in rainy and snowy weather, can easily cause rusting of the muffler surface.
Rust on the surface of a muffler is an objective and common phenomenon that only occurs on the surface of stainless steel plates and does not affect the functionality of the muffler. Therefore, as long as the muffler does not rust or leak during use, it can be used normally.
Therefore, when using a vehicle, you don't have to worry about discoloration and corrosion of the exhaust system muffler, because this is also an objective and common phenomenon.
