Filter with automatic blowdown function

The utility model relates to a filter with automatic blowdown function, which comprises a filtration barrel body, a filter screen which divides the filtration barrel body into a water inlet cavity and a water outlet cavity is axially arranged in the middle of the interior of the filtration barrel body, the top part of the filtration barrel body is provided with an upper cover, and the two sides of center of the upper cover are axially provided with a water inlet and a water outlet which are respectively provided with a water inlet pipe and a water outlet pipe. The technical point is as follows: the water inlet pipe and the water outlet pipe are respectively provided with a water inlet manometer and a water outlet manometer; the bottom part of the water inlet cavity is provided with a draining mouth provided with an electromagnetic valve; and the electromagnetic valve is connected with an electromagnetic valve control circuit. The filter is characterized by reasonable structure design, small occupied area, convenient and flexible installation, low operation and maintenance cost and the like, realizes the automatic blowdown function and back washing function, thus leading wastewater to be utilized reasonably, achieving the purposes of protecting environmental and saving water resource, and having wide application prospect.