HS code-based quota management

With the popularity and HS code-based quota managementincreasing use of cars, the problem of engine noise is also becoming more prominent. Especially on urban roads, the noise of car engines not only affects driving safety, but also brings noise pollution to the surrounding residents, causing a lot of inconvenience and trouble. In order to solve this problem, engine silencers (engine silencers) were born and have been widely used in the automotive industry. This article will provide in-depth explanation and exploration of the engine silencer, which is a necessary equipment.I. The principle of engine silencer. As a necessary equipment for suppressing noise, the principle of engine silencer is mainly to hinder the flow of gas, thus playing a role in reducing engine noise. The main component of the engine silencer is a cylindrical structure composed of multiple chambers, wrapped in fillers inside, and there are imports and outputs at both ends of the structure to connect the engine and the exhaust system. When the high-temperature exhaust gas passes through the pipe of the silencer, the flow speed of the gas will be slowed down due to the obstruction of the filler, so that the noise is mitigated and eliminated. In addition, the outer layer of the silencer is also wrapped in a layer of soundproofing material, which is used to reflect the noise back to the inside of the silencer to further increase the noise reduction effect. This kind of soundproofing material is usually composed of steel plate and glass fiber, which not only has a good sound insulation effect, but also can withstand high temperature environments well.II. The types of engine silencers can be divided into many types according to the structural form and usage occasions of the silencer, of which the two most common are tubular silencers and housing silencers. The tubular silencer is usually installed in the middle of the exhaust system. Its structure is relatively simple. It only needs to set up a pipe with both impedance reflection and multi-group structure in the exhaust pipe to ensure good noise control effect. The housing silencer is relatively complex, consisting of a metal shell and an internal structure or multiple sets of soundproof materials. Housing silencers are usually used in occasions where noise and emission requirements are very strict, such as light buses, large buses and transport trucks. III. The selection method of the engine silencer. The selection and installation of the engine silencer need to consider a variety of factors, including model, emission standards, noise and performance requirements.Generally speaking, the higher the emission standard, the vehicle must use a better muler, and the longitudinal position and suspension position of the vehicle also need to be taken into account. In addition, the service life and installation method of the silencer are also one of the factors to consider. IV. Maintenance and maintenance of engine silencers. As an important part of the automobile exhaust system, ensuring its good working condition and maintenance are crucial to the noise and emission control of the vehicle. Generally speaking, the service life of the silencer is about 1/5 of the service life of the car, so the inspection and cleaning of the exhaust and silencer must not be ignored in the annual maintenance. During the maintenance process, we should focus on the blockage of the inner wall of the silencer, the condition of the soundproofing partition and soundproofing materials, etc. If necessary, all problematic parts should be replaced and replaced. V.The future development trend of engine silencers. With the continuous development of science and technology and the rapid development of the automobile industry, the future of engine silencers will also face new development opportunities and challenges. In the future, engine silencers will pay more attention to the characteristics of high efficiency, environmental protection and energy saving, such as the use of new materials, the optimization of design, the improvement of manufacturing technology and the development of new sound insulation materials to achieve better noise control effect and emission standards. At the same time, with the popularization and development of new energy vehicles such as electric vehicles, the types of engine silencers and usage occasions will also continue to expand and update. In a word, as an important part of the automobile exhaust system, the engine silencer can not only suppress noise, but also improve the emission standards and performance of the vehicle. Choosing a suitable silencer, scientific installation and maintenance will help ensure the safety and comfort of the car when driving.

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