The filter is composed of a casing, a multi-element filter, a backwashing mechanism, and a differential pressure controller. The diaphragm in the housing divides the inner cavity into upper and lower chambers.The upper chamber is provided with a plurality of filter cores, so that the filter space is fully utilized and the volume of the filter is significantly reduced. The counter cavity is installed with a reverse flush suction cup. During operation, the turbid liquid enters the lower cavity of the filter through the inlet and enters the inner cavity of the filter element through the partition hole. Impurities larger than the gap of the filter core are trapped, the clean liquid passes through the slit to the upper chamber, and finally is sent out from the outlet.
Principle of action
Separating the container into upper and lower chambers with a filter medium constitutes a simple filter. The suspension is added to the upper chamber and enters the lower chamber through the filter medium under pressure to form a filtrate, and the solid particles are trapped on the surface of the filter medium to form a filter residue (or filter cake). During the filtration process, the filter residue layer on the surface area of the filter medium is gradually thickened, and the resistance of the liquid passing through the filter residue layer is increased, and the filtration speed is reduced. When the filter chamber is filled with filter residue or the filtration speed is too small, the filtration is stopped, the filter residue is removed, and the filter medium is regenerated to complete a filtration cycle.
The liquid must pass through the filter cake layer and the filter medium to overcome the resistance, so there must be a pressure difference on both sides of the filter medium, which is the driving force for the filtration. Increasing the pressure difference can accelerate the filtration, but the particles deformed after being pressed are likely to block the pores of the filter medium when the pressure is large, and the filtration is slowed down.