WATER WELL STRAINER Russian patent published in 2002 - IPC

FIELD: construction and operation of water wells. SUBSTANCE: water well strainer has supporting framework with filtering coating, flexible hose plugged from bottom and located in the form of spiral on external side of filtering coating. Hose upper end is open for communication with pressure source. Secured to strainer external surface are l-shaped clamps whose horizontal flanges are rigidly connected to supporting framework and flat flexible rings external surface thrust clamp vertical posts. Bristle of flexible pins are located on internal side of flat flexible rings contacting filtering surface. Made between pins are holes directed towards filtering coating. Connected to holes between pins are narrowing packings with curved helical grooves on their internal surface. Supporting framework consists of supporting flanges located at a distance not exceeding ten diameters of strainer, rigidly connected to one another with the help of vertical rods having large and small diameters in alternating sequence. External surface of supporting framework is covered by cover made in the form of aprons with overturned pockets located against small diameter rods. Installed in internal cavity of flat flexible rings are pulsers from bimetallic plates freely fitted on axle. Bimetallic plates have double bent shape whose opposite ends form an angle of 90 deg. EFFECT: increased productivity of water wells, higher carrying capacity of strainer filtering coating. 4 dwg