The water to be treated by the filter enters the body through the water inlet, and the impurities in the water are deposited on the stainless steel filter screen, resulting in a pressure difference. The pressure difference between the inlet and outlet is monitored by the pressure difference switch. When the pressure difference reaches the set value, the electronic controller feeds the hydraulic control valve and drives the motor signal. After the equipment is installed, the technicians will debug and set the filtration time and the cleaning conversion time. The water to be treated enters the body from the water inlet, and the filter starts to work normally. When the preset cleaning time is reached, the electric controller will give the hydraulic control valve , Drive the motor signal, trigger the following actions: the motor drives the brush to rotate to clean the filter element, while the control valve is opened to discharge the sewage. The entire cleaning process only lasts for tens of seconds. When the cleaning is over, the control valve is closed and the motor stops rotating. The system returns to its initial state and begins to enter the next filtration process. The inside of the filter housing is mainly composed of coarse filter screen, fine filter screen, suction pipe, stainless steel brush or stainless steel suction nozzle, sealing ring, anti-corrosion coating, rotating shaft and so on.
Separating the container into upper and lower chambers with filter media constitutes a simple filter. Suspension is added to the upper cavity, and enters the lower cavity through the filter medium under pressure to become filtrate. The solid particles are trapped on the surface of the filter medium to form filter residue (or filter cake). During the filtration process, the filter residue layer on the surface of the filter medium gradually thickens, the resistance of the liquid through the filter residue layer increases, and the filtration speed decreases. When the filter chamber is full of filter residue or the filtering speed is too low, stop filtering, remove the filter residue, and regenerate the filter medium to complete a filtration cycle.
The liquid must overcome the resistance to pass through the filter residue layer and the filter medium, so there must be a pressure difference on both sides of the filter medium, which is the driving force for filtering. Increasing the pressure difference can speed up the filtration, but the deformed particles under pressure will easily block the pores of the filter medium when the pressure difference is large, and the filtration will slow down instead.
