Everything You Need to Know About Pneumatic Mufflers

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In order for valves and other pneumatic systems to decrease the noise level, a pneumatic muffler or pneumatic silencer is used. It contains a set of small cylinders with holes. These cylinders are finely tuned just like a musical instrument. They are built that way for sound wave reflection generated by the machine. They will then partially equal themselves out.  

Pneumatic mufflers make use of some state-of-the-art technology to break off any noise. In this article, we’ll get to know and understand some in-depth detail of a pneumatic muffler as well as how it works. 

However, before we do that, we need to know a succinct detail about sound first. 

The Origin of Sound 

Sound is basically a vibration that multiplies as a resounding pressure wave through a mode of transmission that varies from solid, liquid, or gas. A certain pressure wave is made from alternating pulses of high and low pressure of air. These alternating pulses make their path over the air. 

In a machine, the moment the exhaust valve is unclosed, alternating pulses are produced and a high-pressure of gas abruptly infiltrates the exhaust circuit. The gas molecules will then collide with the low-pressure pipe gas molecules, thus leading these molecules to pile up on top of each other. 

The molecules are also stacked up down the tube with a bit of low-pressure area left behind. It will be easier and faster for sound waves to pass through down the tube compared to gases. 

Pneumatic Muffler and Sound Reduction 

We’ll get to know how pneumatic muffler generates a wave that causes destructive sound interference. 

Within a muffler is a group of small cylinders that are made to reflect waves. These waves create interference within the muffler to cancel each tube out. The sound waves and gases pass through the mid-tube. They rebound off to the muffler wall and are mirrored through small pockets into another room. Once inside the chamber, they will then transfer out the last tube without including the muffler. 

Inside a chamber is a resonator that is attached to the initial chamber through a hole. The said resonator contains a certain amount of air and has a length that is estimated to generate a new wave. This wave will offset the sound frequency. 

Pneumatic Muffler Resonator 

In the event a wave strikes the cylinder, some component continues into the chamber, whilst the other is mirrored. Over the chamber, the wave transmits and reflects the muffler wall as it hits back out the pit. The measurement of the chamber’s length will be calculated so that the wave travels the resonator after the succeeding wave hits back the external chamber. 

Generally, the wave’s extreme-pressured part was mirrored off the external wall of the chamber. This will then lead to the cancellation of two waves out from each other.  

Cancellation of Sound Waves Within a Muffler 

Generally speaking, the sound wave coming from machines and other equipment is a combination of various sound frequencies. These frequencies, oftentimes, rely on the speed of the engine, thus the sound wave is never at the accurate frequency if this happens. The frequency range where most noises are developed, work hand in hand with the resonator. However, even if the resonator is not exactly tuned for frequency, it will still generate damaging interference. 

There are machines made with a great muted operation feature. They also have a different key exhaust component that has a similar look to a muffler, it is referred to as a resonator. 

Resonators work similarly to a resonator chamber inside a muffler. Every dimension is measured properly so that the mirrored sound waves will offset specific sound frequencies within the exhaust. 

Moreover, there are other available features of a muffler that will effectively decrease the level of sound in various means. Generally, there are three key layers of a muffler with two layers of thin metal with a slightly thicker and cushioned layer in between. This will allow the muffler to take in pulses of pressure. 

The external pipes and the inlet are moved into the actual chamber and are punctured. The reason for this is that small pulse pressures spring up around the main and center chamber. This will then cancel out each other to some point considering it is being vacuumed by the housing of the muffler. 

Also, there have been some experiments with feasible mufflers that are built with a noise-canceling feature, specifically on the industrial dynamo. Such systems interrelate a group of speaker and microphone. Another essential characteristic of a muffler is the amount of back-pressure it can generate. Some mufflers generate an equal high back-pressure because of the exhaust’s turns and holes that need to pass through.  

Other muffler types can also decrease the back-pressure. One specific type is called a cherry bomb. This uses absorption to decrease the level of sound. The exhaust in this type of muffler goes directly to the pipe that is punctured with tons of holes in it. There is a glass layer of insulation that surrounds the pipe to absorb pulses of pressure.

Conclusion 

This may not be an in-depth detail about pneumatic mufflers; however, the basic information shared here will definitely help you about pneumatic mufflers and its typical application. Moreover, there are a lot of great choices for check valves in the market and manufacturers are selling pneumatic mufflers considering their amazing benefits to industrial processes