LENGE,the high value-added filter cartridge products will be put into the market in an all-round way. It has a significant benchmark and demonstration role in breaking the monopoly of foreign filtration giants in China high-end filtration market for a long time, creating independent brands of filtration, and promoting the development and growth of China filtration industry.
When the filter works, the water to be filtered enters from the water inlet, filter housing flows through the filter screen, enters the pipeline required by the user through the outlet for process circulation, and the particulate impurities in the water are intercepted in the filter screen. With such continuous circulation, more and more particles are intercepted and the filtration speed is slower and slower, while the imported sewage still enters continuously, and the filter hole will be smaller and smaller, resulting in a pressure difference between the inlet and outlet. When the large difference reaches the set value, the differential pressure transmitter transmits the electrical signal to the controller, and the control system starts the drive motor to drive the shaft through the transmission assembly, At the same time, the drain outlet is opened and discharged from the drain outlet. After the filter screen is cleaned, the differential pressure drops to the minimum, the system returns to the initial filtration state, and the system operates normally. The filter is composed of shell, multi-element filter element, backwashing mechanism, differential pressure controller, etc. The diaphragm in the shell divides its inner cavity into upper and lower cavities. The upper cavity is equipped with a plurality of filter elements, which makes full use of the filtering space and significantly reduces the volume of the filter. A backwashing suction cup is installed in the lower cavity. During operation, the turbid liquid enters the lower chamber of the filter through the inlet and the inner chamber of the filter element through the diaphragm hole. Impurities larger than the filter element gap are intercepted, and the purified liquid passes through the gap to the upper chamber and is finally sent out from the outlet. The filter adopts high-strength wedge-shaped filter screen and automatically cleans the filter element through differential pressure control and timing control. When the impurities in the filter accumulate on the surface of the filter element, causing the inlet and outlet differential pressure to increase to the set value, or the timer reaches the preset time, the electric control box sends a signal to drive the backwash mechanism. When the inlet of the backwashing suction cup is aligned with the inlet of the filter element, the blowdown valve is opened. At this time, the system releases pressure and discharges water. A negative pressure zone with a relative pressure lower than the water pressure outside the filter element appears inside the suction cup and the filter element, forcing part of the net circulating water to flow from the outside of the filter element into the inside of the filter element. The impurity particles adsorbed on the inner wall of the filter element flow into the pan with the water and are discharged from the blowdown valve. filter housing ,the specially designed filter screen produces a spraying effect inside the filter element, and any impurities will be washed away from the smooth inner wall. When the pressure difference between the inlet and outlet of the filter returns to normal or the timer setting time ends, the flow of materials is not cut off in the whole process, and the backwashing water consumption is less, so as to realize continuous and automatic production. Filters are widely used in metallurgy, chemical industry, petroleum, papermaking, medicine, food, mining, electric power and urban water supply. Such as industrial wastewater, circulating water filtration, emulsion regeneration, waste oil filtration treatment, continuous casting water system and blast furnace water system in metallurgical industry, high-pressure water descaling system for hot rolling. It is an advanced, efficient and easy to operate automatic filtering device.
The water to be treated by the filter enters the body from the water inlet, and the impurities in the water are deposited on the stainless steel filter screen, resulting in differential pressure. The pressure difference at the inlet and outlet is monitored through the pressure difference switch. When the pressure difference reaches the set value, the electric controller sends a signal to the hydraulic control valve to drive the motor. After the equipment is installed, the technicians will conduct commissioning, set the filtration time and cleaning conversion time, the water to be treated enters the body from the water inlet, and the filter begins to work normally. When the preset cleaning time is reached, the electric controller will send signals to the hydraulic control valve and drive the motor, causing the following actions: the motor drives the brush to rotate to clean the filter element, At the same time, the control valve is opened for blowdown. The whole cleaning process only lasts for tens of seconds. When the cleaning is completed, close the control valve, the motor stops rotating, the system returns to its initial state and starts to enter the next filtering process. The shell of the filter is mainly composed of coarse filter screen, fine filter screen, sewage suction pipe, stainless steel brush or stainless steel suction nozzle, sealing ring, anti-corrosion coating, rotating shaft, etc. A simple filter is formed by separating the container into upper and lower cavities with filter media. The suspension is added into the upper chamber and enters the lower chamber through the filter medium under pressure to become filtrate. The solid particles are intercepted 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 area of the filter medium is gradually thickened, filter housing, the resistance of the liquid passing through the filter residue layer increases, and the filtration speed decreases. When the filter chamber is full of filter residue or the filtration speed is too small, stop the filtration, remove the filter residue and regenerate the filter medium to complete a filtration cycle. The liquid must overcome the resistance when passing 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 to realize filtration. Increasing the pressure difference can accelerate the filtration, but the deformed particles are easy to block the pores of the filter medium when the pressure difference is large, and the filtration slows down.
During filtration, the particles are adsorbed in the pore channel after entering, such as filtration of porous plastic pipe filter and sand filter. Screen filtration: the solid particles retained by filtration are larger than the pores of the filter medium, and the solid particles are not adsorbed inside the filter medium. For example, the rotary drum filter screen filters out the coarse-grained impurities in the sewage.filter housing ,in the actual filtering process, the three methods often appear at the same time or successively. When the solid particles in the suspension are large and uniform, the pores of the filtered slag layer are relatively unblocked, and the filtrate passes through the slag layer faster. The application of coagulant to collect fine particles into large agglomerates is conducive to improve the filtration speed. For the suspension with fast settling speed of solid particles, the filter fed on the upper part of the filter medium shall be used to make the filtering direction consistent with the gravity direction, and the coarse particles shall settle first, which can reduce the blockage of the filter medium and filter residue layer; Coarse solid particles such as diatomite and expanded perlite are mixed into the difficult to filter suspension (such as colloid), which can make the filter residue layer loose; When the filtrate viscosity is high, the suspension can be heated to reduce the viscosity. These measures can speed up the filtration speed
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