Self cleaning laminated filters are widely used in industrial and commercial fields, such as food, textiles, metallurgy, plastics, pharmaceuticals, building materials, paper making, HVAC systems in industrial and commercial buildings, agriculture, aquaculture, irrigation, wastewater treatment, sewage regeneration, municipal water supply, natural water plants, large power plants, chemical enterprises, and emergency filtration. The filtration level is based on the water quality requirements of the downstream water system or equipment Determine the requirements for water quality in water usage scenarios.
Filtering stage principle The turbid water of the laminated filter enters the filter through the filter inlet, and the turbid water passes through the surface of the laminated filter element to form a filter. The filter laminations are tightly pressed together under the action of spring force and hydraulic power. Impurity particles are trapped at the intersection of the laminations, and the filtered water flows out from the main pipe of the filter. At this time, the three-way backwash valve is in the open state.
working principle The filter element of a laminated filter is composed of a group of plastic discs with grooves on both sides in different directions, which are superimposed on each other. The groove edges on the adjacent surfaces form numerous intersections, which form a large number of cavities and irregular paths, which continuously narrow from the outside to the inside. During filtration, these pathways cause water to overflow, ultimately causing impurities in the water to be intercepted at various intersections. A plurality of discs are superposed and installed on the filter element framework, forming a filtering unit that is loose on the outside and tight on the inside under the pressure of the spring and water inlet. The laminations pressed by springs and water pressure in each filter unit form a filter screen that cannot pass through countless impurities. The lamination width is 12-14mm, and the lamination material is high-quality engineering plastic, with high wear resistance. Supported by stainless steel springs, the structure is sturdy. The backwash water flows from the inside to the outside along the tangential direction of the inner wall of the stack to wash various impurities adhered to the surface of the stack. The stack rotates under the action of the backwash water flow, ensuring that all impurities are effectively cleaned and discharged. All steps of backwashing can be controlled using time intervals and pressure differences. Once set, it can be used for a long time. The automatic backwash filter completes the entire automatic backwash process within seconds without interrupting its operation. The filter using this filtering principle can dynamically change the lamination gap during filtering and backwashing, which is very beneficial for improving filtering performance and filtering water quality, and can greatly reduce the backwashing water consumption, which is usually about 0.25%. The different depth and number of grooves on the disk determine the filtering accuracy of the filtering unit.
Principle of backwash stage When a certain pressure difference is reached, or within a set time, the system automatically enters the backwash state. The controller controls the valve to change the water flow direction, and the one-way membrane at the bottom of the filter closes the main channel. The backwash enters four groups of nozzle channels. The water pressure in the piston chamber connected to the nozzle channels rises, and the piston moves upward to overcome the pressure of the spring on the lamination, releasing piston space on the top of the lamination group, At the same time, backwash water is sprayed at high speed from the nozzles above the four groups of nozzle channels in the tangential direction of the lamination, causing the lamination to rotate and evenly separate. The spraying water sprays the surface of the lamination and throws out impurities trapped on the lamination. When the backwash is completed, the water flow direction changes again, the lamination is compressed again, and the system enters the filtering state again.
control system Adopt industrial single chip PLC automatic control, Chinese or English display. The filter can be automatically cleaned according to pressure difference or timing control, and can be manually or forcibly cleaned. Filtration time and cleaning time can be set on site. Operation signal, cleaning signal, fault signal output, and 485 communication interface.
Self cleaning laminated filter Laminated filter unit material: reinforced plastic, carbon steel sprayed with epoxy resin, stainless steel Pipeline material: carbon steel sprayed with epoxy resin, stainless steel Cleaning device: stainless steel Three-way backwash valve: reinforced plastic, cast iron Sealing ring: NBR, silicone rubber Control box: PVC
