The filter element is a filter, also called air filter cartridge, air filter, style, etc. Mainly used for air filtration in engineering locomotives, automobiles, agricultural locomotives, laboratories, aseptic operating rooms and various precision operating rooms.
The engine should suck in a large amount of air during the working process. If the air is not filtered, the dust suspended in the air is sucked into the cylinder, which will accelerate the wear of the piston group and the cylinder. Larger particles enter between the piston and the cylinder, causing a serious "cylinder" phenomenon, which is especially severe 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 to ensure sufficient and clean air in the cylinder.
According to the filtration principle, the air filter can be divided into several types: filter type, centrifugal type, oil bath type and composite type. The air filters commonly used in engines mainly include inertial oil bath air filters, paper dry air filters, and polyurethane filter air filters. The inertial oil bath air filter is filtered by inertial filter, oil bath filter and filter filter. The latter two air filters are mainly filtered through the filter. Inertial oil bath air filter has the advantages of low air intake resistance, can adapt to dusty and sandy working environment, and has long service life. It has been used in various types of automobile and tractor engines. However, such an air filter has a low filtration efficiency, a large weight, a high cost, and inconvenient maintenance, and has been gradually eliminated in automobile engines. The filter element of the paper dry air filter is made of resin-treated microporous filter paper. The filter paper is porous, loose and folded, has certain mechanical strength and water resistance, and has high filtration efficiency, simple structure, light weight and cost. Low and easy to maintain, it is the most widely used automotive air filter. The filter element of the polyurethane filter air filter is made of soft, porous and sponge-like polyurethane. It has strong adsorption capacity. This air filter has the advantages of paper dry air filter, but the mechanical strength is low. It is widely used. The latter two air filters have the disadvantage of short service life and unreliable operation under harsh environmental conditions.
Various air filters have their own advantages and disadvantages, but inevitably there is a contradiction between the amount of intake air and the efficiency of filtration. With the in-depth study of air filters, the requirements for air filters are also increasing. Some new air filters have emerged, such as fiber filter air filters, duplex filter material air filters, muffle air filters, and constant temperature air filters to meet the needs of engine operation.
Installation and use:
1. During installation, whether it is flanged or rubber tube connected or directly connected between the air filter and the engine intake pipe, it must be tight and reliable to prevent air leakage. Rubber gaskets must be installed on both ends of the filter; fixed air filtration The wing nut of the outer cover cannot be over tightened to avoid crushing the paper filter.
2. During maintenance, the paper filter must not be cleaned in oil, otherwise the paper filter will fail and it will easily cause a flying accident. For maintenance, use only the vibration method, soft brush removal (to follow the wrinkle brush) or compressed air back-blowing to remove dust and dirt adhering to the surface of the paper filter. For the part of the strainer, the dust at the dust collecting part, the blade and the cyclone tube should be removed in time. Even if it can be carefully maintained every time, the paper filter can not fully restore its original performance, and its intake resistance will increase. Therefore, when the paper filter needs to be subjected to the 4th maintenance, the new filter should be replaced. If the paper filter has cracked, perforated or degreased filter paper and end cap, it should be replaced immediately.
3. When using, it is necessary to prevent the air filter from being wet by rain, because once the paper core absorbs a large amount of water, it will greatly increase the air intake resistance and shorten the mission. In addition, the paper core air filter cannot be in contact with oil and fire.
4. Some vehicle engines are equipped with a cyclone air filter. The plastic cover at the end of the paper filter element is a shroud. The blades on the cover rotate the air, and 80% of the dust is separated by the centrifugal force and collected in the dust collection. The dust reaching the paper filter is 20% of the amount of dust inhaled, and the total filtration efficiency is about 99.7%. Therefore, when servicing the cyclone air filter, be careful not to leak the plastic shroud on the filter element.
