Although the filter performance of each filter is different, and its filtration mechanism has its own characteristics, in the process of selecting and designing the filter, the filter material compatibility, flow pressure difference characteristics, filtration precision selection, Main design factor parameters such as filter strength.
1. Filter material compatibility
The filter material is divided into: 100% plant fiber, glass fiber, quartz fiber, rayon, synthetic fiber, metal fiber, chemical fiber, etc.; according to the raw materials used for sintering: stainless steel powder sintering, copper, titanium , iron, Monel, plastic particles, sand, glass beads sintering. Filter materials made of various raw materials have essential differences in the compatibility of different types of filter media.
The compatibility of the filter material refers to the compatibility of the filter medium with the working fluid. For example, whether the filter material softens and melts due to the heat of the working fluid, and whether the filter material function deteriorates under the influence of acid, alkali and other chemicals, such as embrittlement, swelling, softening, decomposition, etc. .
2. Verification of the filter material and liquid compatibility.
International Standard ISO 2943 specifies that the filter material is compatible with a specified liquid and is immersed in the system fluid at elevated temperatures to verify the filter's ability to maintain its crack resistance rating. The specific practices are as follows:
The structural integrity test ISO2942 is applied to the filter element, and the bubble point pressure should reach the production requirements.
Immerse the filter element in the specified system liquid for at least 72h, the liquid temperature should be 15 °C higher than the manufacturer's recommended maximum working temperature, and then carry out the fracture resistance test, and then carry out the structural integrity test of the filter element according to ISO2942, no visible structure. Damage or reduced signs of function.
3. The filter is installed on the suction line of the pump
This type of installation is mainly used to protect the pump from inhaling large mechanical impurities. Generally, coarse filters with low filtration accuracy or ordinary precision filters are used. Because the pump sucks oil from the fuel tank, in order not to affect the oil absorption performance of the pump, the oil absorption resistance should be as small as possible, otherwise the hydraulic pump will not absorb oil well or cavitation and generate strong noise. At this time, the oil passing capacity of the filter should be more than twice the flow rate of the hydraulic pump, and the pressure loss should not exceed 0.01-0.035 MPa. If necessary, the suction port of the pump should be placed below the tank level.
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