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The air filter selected for the air filter element must match the power, economy and reliability of the original engine. The air chlorine flow rate in the technical parameters of the rated air intake filter element should be greater than the rated air intake capacity of the matched engine. The filter material has requirements such as thickness, tension, original air inlet resistance, filtration accuracy, etc. The air filtration accuracy required for imported diesel engines should be less than that for domestic diesel engines. The filtration precision of high-efficiency filter paper is , ordinary imported filter paper is only , while domestic filter paper is only . Filter element performance test ① Flow resistance pressure drop test measures air flow pressure loss flow resistance or flow pressure gap curve. ②The original filtration efficiency test can calculate the dust collection efficiency of the filter element. The dust reduction rate of the normal filter element should be above. ③Dust storage capacity test and cumulative efficiency test: Excessive dust accumulation in the filter element causes blockage and increases air intake resistance. The air intake resistance when engine power decreases or fuel consumption increases is a limit value. When this value is reached, the filter element must be cleaned or replaced. During the test, the weight of dust accumulated when the air inlet resistance or pressure drop reaches the point is the dust storage capacity of the filter element, and the filtration efficiency during this test is the cumulative efficiency. ④ Original air intake resistance test: When the air volume passes through the filter element when the air intake resistance is rated, the pressure difference at the inlet and outlet should not exceed. Otherwise, the power will decrease and the engine will emit black smoke. Diesel filter The diesel filter shall be subjected to the following tests according to the standard test method for fuel filters for diesel engines of road vehicles. The new filter cleanliness test determines whether the inside of the filter element has been cleared of dust and impurities remaining in production, storage and transportation. The bubble test is used to confirm whether there are pores in the filter element that are greater than the filtration accuracy. Filtration efficiency and life test Filtration efficiency refers to the determination of the percentage of specific particles filtered out, and filter life is expressed by the clogging test pressure difference over time. The water separation effectiveness test determines the percentage of water in the oil-water mixture separated by the oil filter. The filter element breakage test determines the filter element's resistance to bursting pressure. The oil filter assembly breakage test determines the assembly's ability to withstand internal pressure. The pulsating pressure fatigue test determines the mechanical strength of the oil filter assembly when the engine is started or stopped under pulsating pressure. The anti-vibration fatigue test determines the mechanical strength of the oil filter against vibration under normal use conditions. Oil filter Full-flow oil filter shall undergo the following tests according to the standard. The pressure drop flow characteristic test uses engine oil of specified viscosity to determine the pressure drop flow curve of the oil filter assembly. Characteristic test of filter element bypass element determines filter element pressure drop bypass flow curve. When the pressure drop through the filter element is low, in order to limit the amount of unfiltered engine oil, the bypass element allows a small amount of oil leakage when it is lower than the specified opening pressure drop. When the filter element is completely blocked, the bypass element can be bypassed. full flow without exceeding the specified pressure drop. High Pressure Drop and High Temperature Characteristics Test The oil filter will experience a high pressure drop during operation, especially when the filter element is clogged. In addition, the filter element is also affected by the high temperature of the engine oil. The ability of the filter element to withstand high pressure drop without damage should be tested under simulated high temperature conditions. The filter element life and filtration efficiency test uses the particle counting method to measure the filter element. During the test, the relationship curve of the pressure difference test time or the pressure difference plus ash weight is drawn to represent the filter element by the test time or the weight of pollutants when the bypass valve design opening pressure is reached. life. When the cumulative efficiency test uses a gravimetric method to measure the life of the filter element, it is evaluated by the test time or the amount of pollutants captured when the pressure difference reaches the end point of the test. Hydraulic pulse fatigue test The oil filter is subject to the effect of fluctuating pressure in the cooling state of the engine during use. During the test, the specified pulsating oil pressure is used and the number of cycles is used to determine the pressure resistance of the oil filter housing, sealing ring and filter element against high pressure fluctuations. Vibration fatigue test: After installing the machine stain filter assembly, add the frequency and amplitude of the resonance caused by the vibration surface of the simulated engine or installation structure, maintain the specified oil pressure, and cycle it tens of thousands of times to ensure that there are no small oil leaks or fatigue Damage performance