High pressure filters are suitable for filtering out solid and liquid impurities in high-pressure compressed air. The filter is composed of a cylinder, a stainless steel filter screen, a drainage 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, simply remove the detachable filter cartridge, process it, and reinstall it, making it easy to use and maintain.

When the filter is in operation, the water to be filtered enters through the water inlet, flows through the filter screen, and enters the pipeline required by the user through the outlet for process circulation. Particle impurities in the water are trapped inside the filter screen. In such a continuous cycle, more and more particles are intercepted, and the filtration speed is getting slower and slower. However, the imported sewage continues to enter continuously, and the filter hole will become 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 sends an electrical signal to the controller, and the control system starts to drive the motor to rotate the shaft through the transmission component. At the same time, the sewage outlet opens and is discharged from the sewage outlet, After the filter screen is cleaned, the pressure difference drops to a small value, and the system returns to the initial filtering state, and the system operates normally. The filter is composed of a shell, a multi-element filter element, a backwash mechanism, and a differential pressure controller. The transverse partition inside the shell divides its inner chamber into upper and lower chambers. The upper chamber is equipped with multiple filter elements, which fully fills the filtering space and significantly reduces the volume of the filter. A backwash suction cup is installed in the lower chamber. During operation, the turbid liquid enters the lower chamber of the filter through the inlet and then enters the inner chamber of the filter element through the partition hole. Impurities larger than the gap of the filter element are intercepted, and the clean liquid passes through the gap to reach the upper chamber, and then is 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 accumulate on the surface of the filter element, causing the inlet and outlet pressure difference to increase to the set value, or when the timer reaches the preset time, the electric control box sends a signal to drive the backwash mechanism. When the backwash suction cup mouth is aligned with the inlet of the filter element, the drain valve opens, and the system releases pressure and discharges water. A negative pressure zone appears on the inner side of the suction cup and filter element with a relative pressure lower than the water pressure on the outer side of the filter element, forcing some clean circulating water to flow into the inner side of the filter element from the outer side. Impurities and particles adsorbed on the inner wall of the filter element flow into the suction cup with water and are discharged from the drain valve. The specially designed filter screen creates 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 material does not stop flowing throughout the process, and the backwashing water consumption is low, achieving continuous and automated production. Filters are widely used in the fields of metallurgy, chemical industry, petroleum, papermaking, medicine, food, mining, electricity, and urban water supply. Such as industrial wastewater, filtration of circulating water, regeneration of emulsions, filtration treatment of waste oil, continuous casting water system and blast furnace water system in the metallurgical industry, and high-pressure water descaling system for hot rolling. It is an advanced, * and easy to operate fully automatic filtering device.