pressure plate and frame oil filter of filtering aid principle
The pressure plate and frame oil filter adopts the international filtering aid principle. In the filtration process, the filter aid (such as diatomite, perlite, etc.) is used as the substantial filtering medium instead of the filter filter element. The pressure plate and frame oil filter takes advantage of the high-altitude porosity (ε > 0.7) of the filter aid, Low compression ratio (compression index n < 0.3), through the dynamic addition of filter aid, the permeability of filter cake is maintained, and the formation of dense blocking layer in the filter layer is avoided, which greatly prolongs the filtration cycle. Under low pressure (below 0.45 MPa), the pressure plate and frame oil filter can completely remove the micro impurities, colloids, bacteria, etc. in the filtrate. Through the dynamic addition of filter aid, the dynamic filter layer (slag cake) is formed by the cross mixing of filter aid and small impurities. Although the filter layer of pressure plate and frame oil filter is constantly forming and thickening, it will not be completely blocked. It can not only ensure the filtration accuracy and flow rate, but also greatly extend the filtration period.
Before the operation of the pressure plate and frame oil filter, the filter paper with flushing holes shall be prepared, and then it shall be carefully installed between each filter plate and filter frame. The number of filter paper in each layer is generally 1-2, depending on the filtering requirements and mainly the quality of filter paper. When the pressure plate and frame oil filter clip filter paper, do not offset the oil inlet and outlet holes to cause leakage, and if not installed in place, the filtering effect will be affected.
If it is necessary to filter water, the oil filter paper should be dried before use. The pressure plate and frame oil filter can be dried in an oven with the drying temperature of about 120 ℃. When using the used oil filter paper, the oil filter paper must be dried and carefully checked to be free of any damage. Pay attention to the side with filter residue (i.e. the dirty side) should be placed against the filter frame, and the filter plate should not be used, so as to avoid impurities being washed down and polluting the filtered oil. When the filtering pressure is high and the oil filter paper is broken, the filter cloth can be lined on the side close to the filter plate or the oil filter paper can be replaced to increase the filtering strength. After the filter paper is placed in the pressure plate frame oil filter, rotate the triangular hand wheel to press the filter plate and filter frame. When pressing the plate and frame, only one person is allowed, and the pressing handle cannot be lengthened to compress, so as to avoid damaging the machine.
Close the sampling nozzle. If the user has a valve on the oil discharge pipe, the valve should be opened. Switch on the power supply of the motor to make the pressure plate frame oil filter work. The normal working pressure of the pressure plate frame oil filter changes with the viscosity of the oil filter and the resistance of the discharge pipe. Generally, the initial pressure of the filter is low in the range of 0.05-0.3mpa. The pressure of the pressure plate and frame oil filter increases with the increase of the filtering time and the water absorbed by the filter residue and filter paper The filter paper should be replaced in time when the oil filter reaches a certain level (depending on the user's requirements for oil).
In the process of oil filtering, the oil nozzle can be unscrewed for sampling. When shutting down, open the air inlet valve first and stop the machine when there is no oil in the oil outlet pipe. Close the oil inlet and outlet valve, stop the oil pump, loosen the pressing device, take out the filter paper piece by piece, clean the filter paper and the filter residue in the filter frame, replace the filter paper in the pressure plate frame oil filter, clamp the filter paper again, and cover the oil tank. After cleaning, clean the coarse filter, cover and tighten the bolts again.