Self -cleaning screen filter

Thereby utilize the scraper blade self -cleaning to influence the problem in filter life -span to the filter among the prior art, the utility model provides a self -cleaning screen filter, it includes the casing, set up at the inside filter screen of casing, the pneumatic cleaning system who sets up at the casing top and the electric cabinet of controlling pneumatic cleaning system, is equipped with the water inlet at the casing lower extreme, is equipped with delivery port and blow off pipe on the lateral wall on casing upper portion respectively, pneumatic cleaning system includes cylinder, cylinder axle and acceleration board, and cylinder axle one end sets up in the cylinder, and in the downward extending cylinder of the other end extended to the casing, board was with higher speed connected to the lower extreme of cylinder axle, it presses the mouth to be provided with on the casing to get for set up pressure measuring equipment, wherein, acceleration board and filter screen between be provided with the