synonymAir filter(Device for removing impurities in the air) Generally refers to the air filter element
The air filter element 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, aseptic operating rooms and various precision operating rooms.
Engine atworking processIf the air is not filtered, the suspended dust in the air will be sucked into the cylinder, which will accelerate the wear of the piston set and cylinder.Large particles entering between the piston and the cylinder will cause serious“Cylinder”This is especially serious in dry and sandy working environment.The air filter is installed incarburetororIntake pipeIn front of the cylinder, it can filter out dust and sand particles in the air and ensure sufficient and clean air in the cylinder.
According to the filtering principle, air filters can be divided into filtering type, centrifugal type, oil bath type and composite type.The air filter commonly used in the engine mainly has inertiaOil bath air filter, paper dry air filterpolyurethaneFilter element, air filter, etc.Inertia oil bath air filter successively passes through three stages of inertial filtration, oil bath filtration and filter filtration, and the last two air filters are mainly filtered through filter element.Inertial oil bath air filter has the advantages of small air inlet resistance, being able to adapt to dusty and sandy working environment, and long service life. It was previously used on many types of automobile and tractor engines.However, this air filter has low filtering efficiency, large weight, high cost and inconvenient maintenanceautomobile engineChina has been gradually eliminated.The filter element of paper dry air filter adoptsResin treatmentThe filter paper is porous, loose, foldedmechanical strengthandWater resistanceIt has the advantages of high filtering efficiency, simple structure, light weight, low cost, convenient maintenance, etc. It is the most widely used automotive air filter.Polyurethane filter element The filter element of the air filter is made of soft, porous, spongy polyurethane with strong adsorption capacity. This air filter has the advantages of paper dry air filter, but its mechanical strength is lowCar engineIt is widely used in.The disadvantage of the latter two air filters is that their service life is relatively shortenvironment conditionThe lower work is not reliable.
Advantages and disadvantages
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Various air filters have their own advantages and disadvantages, but they inevitably existIntake volumeAnd filtration efficiency.With the in-depth study of air filters, the requirements for air filters are becoming higher and higher.Some new types of air filters have emerged, such as fiber filter, dual filter material air filter, silencing air filter, thermostatic air filter, etc., to meet the needs of engine operation.
1. During installation, air filter and engineIntake pipeBetweenflange、Rubber tubeThe connection or direct connection must be tight and reliable to prevent air leakage. Rubber gaskets must be installed on both ends of the filter element;Secure the air cleaner housingWing nutDo not tighten it too tightly to avoid crushing the paper filter element.
2. During maintenance, the paper filter element must not be cleaned in oil, otherwise, the paper filter element will become invalid and may cause an accident of flying cars.During maintenance, only the vibration method, soft brush brushing method (brush along its wrinkles) or compressed air back blowing method can be used to remove the dust and dirt attached to the surface of the paper filter element.yesPrimary filterPart, the dust at the dust collection part, blade and cyclone tube shall be removed in time.Even if the paper filter element can be maintained carefully every time, its original performance cannot be completely restored, and its air inlet resistance will increase. Therefore, generally, when the paper filter element needs to be maintained for the fourth timeMaintenanceThe filter element should be replaced.If the paper filter element is broken, perforated, or the filter paper andEnd capDegummingIt should be replaced immediately.
3. When using, the paper core air filter should be strictly prevented from being wet by rain, because once the paper core absorbs a lot of water, it will greatly increase the air intake resistance and shorten the mission.In addition, the paper core air filter cannot contact with oil and fire.
4. Some vehicle engines are equipped with whirlwind air filters. The plastic cover at the end of the paper filter element isShroudThe blades on the cover make the air rotate, 80% of the dustcentrifugal forceThe dust that reaches the paper filter element is 20% of the dust inhaled, and the total filtering efficiency is about 99.7%.Therefore, when maintaining the cyclone air filter, be careful not to place the plastic air guide cover on the filter elementMissing installation。
Maintenance
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1. The filter element is the core part of the filter, which is made of special materialsWearing parts, special maintenance is required;
2. When the filter has been working for a long time, the filter element has intercepted certain impurities, which will lead to an increase in pressure and a decrease in flow. At this time, it needs to be cleaned in time;
3. When cleaning, be sure not to deform or damage the filter element.
Generally, the service life of the filter element is different depending on the raw materials used. However, with the extension of service time, impurities in the air will block the filter element, so generally, the PP filter element needs to be replaced within three months;Activated carbon filter elementIt needs to be replaced within six months;The fiber filter element cannot be cleaned, so it is usually placed in thePP cottonandActivated carbonIt is not easy to block because of its rear end use;Ceramic filter elementIt can be used for 9-12 months.
The filter paper in the equipment is also one of the keys, high qualityFilter equipmentThe filter paper in is usually filled withsynthetic resinOfMicrofiberPaper, which can effectively filter impurities and has strong dirt storage capacity.According to relevant statistics, oneoutput powerThe impurities filtered by the filtering equipment are about 1.5 kg when the 180 kilowatt bus travels 30000 kilometers.In addition, the equipment also has great requirements for the strength of the filter paper. Because of the large air flow, the strength of the filter paper can resist the strong air flow, ensure the filtering efficiency, and extend the service life of the equipment
(2) ISO 16889, Hydraulic fluid power - Filters - Determination of filtration characteristicsMultiple pass method
(3) ISO 3968 Hydraulic fluid power - Filters - Pressure dropFlow characteristicsDetermination of
(4) ISO 3724 Hydraulic fluid power - Filter elements - FlowFatigue characteristicDetermination of
(5) ISO 3723 Hydraulic fluid power - Filter elements-Axial loadtest method
(6) ISO 2943 Hydraulic fluid power - Filter elements - Materials and fluidsCompatibilityVerification of
(7) ISO 2941 Hydraulic fluid power - Filter elements - Verification of resistance to cracking
Product features
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Hyundai MotorIt is more and more common for engines to use paper core air filters, but some drivers still have a prejudice against paper core air filters, believing that the filtering effect of paper core air filters is not good.In fact, the paper core air filter andOil bath air filterThere are many advantages compared with: firstFiltration efficiencyUp to 99.5% (98% for oil bath air filter)TransmissivityOnly 0.1% - 0.3%;The second is compact structure, which can be installed in any direction, and is not limited by the layout of vehicle parts;Third, no oil consumption during maintenance, which can also save a lot of moneyCotton yarn、feltandMetallic materialsEtc;Fourth, the quality is small and the cost is low.Therefore, the driver can use it with confidence.
The key to using the paper core air filter well is to maintain its sealing performance and prevent the unfiltered air frombypassEnter the engine cylinder.
