The automotive Pneumatic Air Muffler is a key component for driving noise. The Pneumatic Air Muffler is such a device to reduce exhaust noise, as there are basically strict noise limits for all kinds of cars in the world.

Introduction

The Pneumatic Air Muffler is a key component for driving noise. The Pneumatic Air Muffler is such a device to reduce exhaust noise.

The role of Pneumatic Air Muffler is to eliminate noise by reducing and attenuating the pulsation of exhaust pressure.

According to the interference principle, Pneumatic Air Muffler has two basic types of muffling, absorption and reflection. Absorption muffler reduces the energy of exhaust gas by friction of sound absorbing materials such as glass fiber, steel fiber and asbestos. Reflection muffler has several harmonic chambers connected in series, and the harmonic chambers are connected with different lengths of porous reflection tubes, and the exhaust gas is reflected, collided, expanded and cooled in the harmonic chambers several times to reduce its pressure and reduce vibration and energy.

In fact, Pneumatic Air Muffler is mostly designed in cars with the help of different combinations of anechoic principles. Meanwhile, in small buses with high comfort requirements, multiple mufflers can be used for multi-stage muffling and noise reduction adjustment.

Structure form

According to the muffling principle and structure, automobile Pneumatic Air Muffler can include three types: resistance muffler, resistance muffler and impedance compound muffler.

1.Resistive muffler Resistive muffler refers to various muffling units such as expansion chamber, resonance chamber, etc. It is composed of pipes, partitions and so on. The muffler is composed of pipes, partitions and so on, in which sound waves are reflected and interfered in the process of propagation to reduce the sound energy to achieve the purpose of muffling. The muffling frequency band of resistant mufflers is limited. Generally speaking, they have good muffling effect in the middle and low frequency band and poor muffling effect in the high frequency band. Resistant mufflers are often used on trucks.

2. Resistance muffler E is a kind of muffler that fills sound absorbing materials around the pipe through which the internal exhaust gas passes to absorb sound energy for the purpose of muffling. It has good muffling effect on middle and high frequencies, and is seldom used as automobile exhaust muffler, so it is usually used in combination with reaction muffler.

3. Impedance composite muffler is a muffler composed of resistance muffler unit and sound absorption material respectively, which has the common features of resistance muffler and resistance muffler. Basically, it has very good muffling effect on low, middle and high frequency noise.

Important role

To reduce engine exhaust noise and make high temperature exhaust gas discharged safely and effectively.Pneumatic Air Muffler as a part of exhaust pipe should ensure smooth exhaust, low resistance and sufficient strength. The muffler needs to withstand high temperature exhaust of 500℃~700℃ to ensure that the Pneumatic Air Muffler will not be damaged or lose its muffling effect within the driving range specified by the car.