Bag filter is an indispensable device on the conveying medium pipeline

The filter is an indispensable device on the pipeline of the conveying medium. It is usually installed on the inlet side of the pressure reducing valve, pressure relief valve, fixed water level valve, Fanggong filter and other equipment. The filter consists of a cylinder, a stainless steel filter screen, a sewage part, a transmission device and an electrical control part. After the water to be treated passes through the filter cartridge of the filter screen, its impurities are blocked. When cleaning is needed, just take the detachable filter cartridge out and reinstall it after treatment. Therefore, it is extremely convenient to use and maintain.

When the filter is working, the water to be filtered enters from the nozzle, flows through the filter screen, and enters the pipeline required by the user through the outlet for process circulation. The particles in the water are trapped inside the filter screen. With such a continuous cycle, more and more particles are intercepted, and the filtering speed is slower and slower. However, the imported sewage is still continuously entering, and the filter holes will become smaller and smaller, thereby creating pressure between the inlet and the 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 to rotate through the transmission assembly. At the same time, the sewage outlet is opened and discharged from the sewage outlet. After cleaning, the pressure difference drops to the minimum value, the system returns to the initial filtering state, and the system operates normally. The filter consists of a housing, a multi-element filter element, a backwash mechanism, and a differential pressure controller. The transverse partition in the shell divides the inner cavity into upper and lower cavities, and the upper cavity is equipped with multiple filter elements, which makes the filter space sufficient and significantly reduces the volume of the filter. The lower cavity is equipped with backwashing Sucker. When working, the turbid liquid enters the lower cavity of the filter through the inlet, and then enters the inner cavity of the filter element through the partition hole. The impurities larger than the gap of the filter element are intercepted, and the clean liquid passes through the gap to the upper cavity, and is finally sent out from the outlet. The filter adopts a high-strength wedge-shaped filter screen, which automatically cleans the filter element through pressure difference control and timing control. When impurities in the filter accumulate on the surface of the filter element and cause the pressure difference between the inlet and outlet 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 backwash suction cup port is directly opposite to the filter element inlet, the drain valve is opened, and the system discharges pressure at this time. A negative pressure zone appears on the inside of the suction cup and the filter element which is lower than the water pressure outside the filter element, forcing part of the net circulating water from the outside of the filter element Flowing into the inner side of the filter element, the impurity particles adsorbed on the inner wall of the filter element flow into the drum with water and are discharged from the drain valve. The specially designed filter screen produces a spray 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 is over, the material flows continuously during the whole process, and the backwashing consumes less water, realizing continuous and automated production. Filters are widely used in the fields of 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 in the metallurgical industry, blast furnace water system, high-pressure water descaling system for hot rolling. It is an advanced, efficient and easy-to-operate automatic filter device.