HS code strategy for African trade lanes

List of this article:

• 1,HS code strategy for African trade lanes What are the classifications of car silencers
• 2 、The car exhaust pipe silencer has a buzzing sound
• 5. What kind of car silencer is good

What are the divisions of car silencers Class

1. Next, let's talk about the classification of car silencers. Mupers are a key role in reducing noise in cars. They are generally divided into three categories, resistance (shape), resistance (shape) and composite type. The actual effect of silencers of different materials is also different.The key of the resistive silencer is composed of porous tubes and sound-absorbing chemical fibers (sound-absorbing cotton).

2. Classification of automobile silencers: There are many types of silencers, but their silencers can be divided into six main types, namely resistive silencers, resistance silencers, imped composite silencers, micro-perforated plate silencers, small hole silencers and active silencers.

3. Impedance composite silencer is characterized by both expansion chamber and sound-absorbing fiber. The silencer is composed of a combination of resistant silencer units and sound-absorbing materials respectively. It combines the characteristics of the first two silencers. The corresponding range is wide and the volume is more flexible, but the cost is also relatively high.

What is the function of car silencer?

1. What is the function of the car silencer: the key role.Reduce the engine exhaust noise, so that high-temperature exhaust gas can be discharged safely and effectively. As a part of the exhaust pipe, the silencer should ensure smooth exhaust, small resistance and sufficient strength.

2. The function of the silencer is to reduce the exhaust noise of the engine and make the high-temperature exhaust gas safe and effectively discharged. As part of the exhaust pipe, the silencer should ensure that its exhaust is smooth, the resistance is small and the strength is sufficient.

3. What is the function of exhaust silencer: Classification According to the principle and structure of silencer, automobile silencer can include three types: resistance silencer, resistance silencer and impedance composite silencer. Resistance silencer Resistance silencer refers to various silencers such as expansion chambers and resonance chambers. It is composed of pipes, partitions, etc.

4. The exhaust pipe is equipped with a central silencer and the main silencer.Instrument, the central silencer is installed after the ternary catalytic converter, and the main silencer is installed at the end of the exhaust pipe, which plays the main role of silence.

5. It plays the role of silencer, which is used to reduce the exhaust pulsation and reduce the exhaust noise as much as possible.

6. The function of the exhaust silencer is to reduce the temperature and pressure of the exhaust gas from the exhaust manifold to eliminate Mars and reduce noise. The principle of silencer is to reflect the sound waves of the human silencer from the expanding empty wall to the shell wall, interfering (or conflicting with each other) with each other, so that the sound energy gradually weakens (or disappears).

Where is the car exhaust pipe silencer?

The silencer of a car is the exhaust pipe. The exhaust pipe is also known as a silencer.

Sometimes the silencer alone still does not meet the standard of automobile exhaust noise, so it is necessary to install a resonator similar to a small silencer in the exhaust system. The resonator and the silencer are connected in series, which can further reduce the noise level. The silencer is installed in the middle of the catalytic converter and the exhaust tail pipe and close to the center of the car.

Cruze's ternary catalyst and exhaust branch pipe are integrated, inside the engine compartment and behind the radiator.

The principle of the automobile silencer is introduced in the "Interference of Waves" in Chapter 9 of Mechanical Waves in High School Physics: that is, its exhaust pipe is composed of two pipes of different lengths, which are separated and then converge.

Resistive silencer, E is a silencer that fills sound-absorbing material around the pipe through which the internal exhaust passes to absorb sound energy to achieve the purpose of silence. It has a good effect on medium and high-frequency silencers. It is rarely used as automobile exhaust silencers, and is usually used in combination with resistance silencers.

The silencer is a noise-reducing device installed in the airflow channel of aerodynamic equipment or in the inlet and exhaust systems. Classification of automobile exhaust pipe silencer. Resistance silencer, also known as reflective, is used for most original vehicles. It does not need to worry about the sound absorber will fail over time, so it is relatively durable.

Car exhaust pipe silencer has a buzzing sound

[Pacific Automobile Network] It may be that the engine is difficult to start, weak driving, poor acceleration, unstable engine operation, individual cylinders do not work, and even There is a phenomenon of engine vibration. In addition, there are bubbles coming out of the water inlet of the radiator, and sometimes the exhaust silencer will drip water droplets.

First of all, judge whether it is the internal sound of the silencer or the resonance sound from the outside and the car body.

The silencer and exhaust pipe are damaged. There is a thermal insulation plate between the exhaust pipe and the ground, which may be caused by the aging of the thermal insulation plate. It may be the failure of the carburetor and platinum or the ignition time is too late.

What kind of car silencer is good

1. The through-hole damping silencer has the advantages of smooth exhaust, high temperature resistance, strong anti-interference and so on. It is generally used for exhaust and silencer of safety valves, exhaust valves, turbines and blow pipes.

2. The frequency band of the resistance silencer is limited. It usually has a good effect on low and medium frequency bands, but the effect of high-frequency silencer is poor. Trucks mostly use resistance silencers. The shape of the resistance silencer is different, and the direction of the airflow is also different. It is a silencer that is filled with sound-absorbing material around the pipe through which the internal exhaust passes to absorb sound energy to achieve the purpose of silence.

3. The choice of silencer should first look at the exhaust volume of the car. If it is above 6, it is recommended to use the original factory parts. In addition, there are many choices; stainless steel silencers are durable and cost-effective, and 409 all-steel is also acceptable. Secondly, semi-steel.Aluminum-plated, galvanized, followed by.

4. Trucks mostly adopt three types of resistance silencers, resistance silencers and impedance composite silencers. The anti-municulator has a limited frequency band, which has a good effect on medium and high frequency.

5, l, 201 stainless steel silencers are easy to rust and have poor corrosion resistance. However, it is also resistant to high temperatures up to 650 degrees. As a car exhaust pipe, I recommend 304 stainless steel. Because the maximum temperature at the outlet of the car engine is less than 650 degrees. 409l, 201 and 304 are all satisfied. However, 304 has good corrosion resistance.

6. Automobile exhaust silencer: mainly used to reduce the noise generated by automobile engine emissions. Different types of silencers are suitable for different scenes and types of sound waves, and the effects are also different. Generally speaking, sound-absorbing silencers and reflective silencers are the types of silencers with better effect.