Horizontal automatic back flushing screen net filter

The utility model is provided with a screen filter used in the farmland water-saving irrigation system in particular to a horizontal automatic backwashing screen filter basically includes a shell, a water inlet pipe, a water outlet pipe, a sewage charger pipe and a filter cartridge with the property of backwashing which is arranged inside the shell. A ring platform is arranged at one end of the shell, and a flange and a block plate matched with the ring platform is arranged outside the shell. A water outlet is arranged on the shell; a filter cartridge is arranged inside the shell; whirl vanes are arranged on that end of the filter cartridge close to the water inlet pipe; a three-way is arranged on the other end of the shell. Double frame (inner and outer) nip-net type backwashing filter cartridge is adopted for the utility model, which can reduce the damage to the filter screen during backwashing and improve the lifetime of the filter screen. Next, the whirl vanes can make the water which flows into the filter cartridge circumrotate to reduce the impurity attaching to the filter screen, to be beneficial for the backwashing, to improve the stability of work and to reduce the happening of malfunction; during the process for removing the impurity, the work of the water pump is not needed to stop; the precursor electromagnetic valve close to the water inlet and the sewage discharger mouth which is adopted to control the implementation of the backwashing, can realize uninterrupted irrigation, and is time-saving and effort-saving and improves the work efficiency; the anti-corrosion material is adopted for the whole filter shell, therefore, the filter shell has certain performance of anti-corrosion.