What Is An Air Filter In A Diesel Engine

Table of Contents

Introduction

The air filter is a kind of filter, also called air filter cartridge, air filter, style, etc.

The air filter is a kind of filter, also called air filter cartridge, air filter, style, etc. It is mainly used for air filtration in engineering locomotives, automobiles, agricultural locomotives, laboratories, sterile operating rooms and various precision operating rooms.

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The Function Of Air Filter

The engine needs to inhale a large amount of air during operation. If the air is not filtered, the dust suspended in the air will be sucked into the cylinder, which will accelerate the wear of the piston group and the cylinder. Larger particles entering between the piston and the cylinder will cause serious “cylinder pulling”, which is particularly serious in dry and sandy working environments. The air filter is installed in front of the carburetor or the intake pipe to filter out dust and sand in the air and ensure that sufficient and clean air enters the cylinder.
According to the filtering principle, air filters can be divided into filtering type, centrifugal type, oil bath type, and composite type. The commonly used air filters in engines mainly include inertial oil bath air filters, paper dry air filters, polyurethane filter element air filters, etc.

About Paper Dry Air Filter And Polyurethane Filter Element Types

We will not introduce oil bath air filter today, because it has been eliminated. Today we will focus on paper dry air filter and polyurethane filter element air filter
The filter element of paper dry air filter is made of microporous filter paper treated with resin. The filter paper is porous, loose, folded, has certain mechanical strength and water resistance, has high filtration efficiency, simple structure, light weight, low cost, easy maintenance and other advantages, and is the most widely used automotive air filter.
The filter element of polyurethane filter element air filter is made of soft, porous, sponge-like polyurethane, with strong adsorption capacity. This air filter has the advantages of paper dry air filter, but low mechanical strength, and is widely used in car engines.

Installation And Use Of Air Filter?

Installation and use
1. During installation, whether the air filter and the engine intake pipe are connected by flange, rubber tube or direct connection, they must be tight and reliable to prevent air leakage. Rubber gaskets must be installed on both ends of the filter element; the wing nut fixing the air filter cover cannot be tightened too tight to avoid crushing the paper filter element.
2. During maintenance, the paper filter element must not be placed in oil for cleaning, otherwise the paper filter element will fail and easily cause a runaway accident. During maintenance, only vibration method, soft brush removal method (brush along its wrinkles) or compressed air backblowing method can be used to remove dust and dirt attached to the surface of the paper filter element. For the coarse filter part, dust should be removed in time from the dust collecting part, blades and cyclone tubes. Even if it can be carefully maintained every time, the paper filter element cannot completely restore its original performance, and its intake resistance will increase. Therefore, generally when the paper filter element needs to be maintained for the fourth time, a new filter element should be replaced. If the paper filter element is broken, perforated, or the filter paper and the end cover are debonded, it should be replaced immediately.
3. When using, be sure to prevent the paper core air filter from being wet by rain, because once the paper core absorbs a large amount of water, it will greatly increase the intake resistance and shorten the mission. In addition, the paper core air filter cannot come into contact with oil and fire.
4. Some vehicle engines are equipped with cyclone air filters. The plastic cover at the end of the paper filter is the deflector. The blades on the cover make the air rotate. 80% of the dust is separated under the action of centrifugal force and collected in the dust cup. The dust reaching the paper filter is 20% of the inhaled dust. The total filtration efficiency is about 99.7%. Therefore, when maintaining the cyclone air filter, be careful not to miss the plastic deflector on the filter element.

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Maintenance Of Air Filter

1. The filter element is the core component of the filter. It is made of special materials and is a vulnerable part. It requires special maintenance and maintenance;
2. After the filter has been working for a long time, the filter element has intercepted a certain amount of impurities, which will cause the pressure to increase and the flow rate to decrease. At this time, it needs to be cleaned in time;
3. When cleaning, be sure to pay attention not to deform or damage the filter element. Generally, the service life of the filter element varies according to the different raw materials used. However, as the use time increases, impurities in the air will clog the filter element. Therefore, generally speaking, the PP filter element needs to be replaced every three months; the activated carbon filter element needs to be replaced every six months; and the fiber filter element cannot be cleaned, so it is generally placed at the back end of the PP cotton and activated carbon, which is not easy to cause clogging.

What Else Should We Pay Attention To When Maintaining The Air Filter

The filter paper in the equipment is also one of the key factors. The filter paper in high-quality filtering equipment usually uses ultra-fine fiber paper filled with synthetic resin, which can effectively filter impurities and has strong pollution storage capacity. According to relevant statistics, a bus with an output power of 180 kilowatts will filter out about 1.5 kilograms of impurities in 30,000 kilometers of driving. In addition, the equipment also has great requirements for the strength of the filter paper. Due to the large air flow, the strength of the filter paper can withstand strong airflow, ensure the efficiency of filtration, and extend the service life of the equipment. 

Conclusion

Compared with the oil bath air filter, the paper core air filter has many advantages: first, the filtration efficiency is as high as 99.5%, and the dust permeability is only 0.1%-0.3%; second, the structure is compact and can be installed in any direction without being restricted by the layout of vehicle parts; third, it does not consume oil during maintenance, and can also save a lot of cotton yarn, felt and metal materials; fourth, it is small in weight and low in cost. The key to using the paper core air filter well is to maintain its sealing performance and prevent unfiltered air from entering the engine cylinder from the bypass.

Tips for Chossing Air Filters

Choose according to the material of the original filter of the engine
Choose a brand with a long business history
Choose to buy from a store with a long business history, because quality is what makes this brand or store last long.

ari filter

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