WATER WELL STRAINER Russian patent published in 1999 - IPC

FIELD: construction and operation of water wells. SUBSTANCE: strainer has supporting frame with filtering coating and plugged flexible hose in the form of spiral located on exterior side of filtering coating. Upper end of hose is opened for connection with pressure source. Attached to supporting frame are clamps in the form of lower and upper horizontal shelves and vertical post having holes connected to which, from one side, are narrowing nozzles in the form of truncated cone and directed opposite to filtering coating, and from the other side, branch pipes. Lower horizontal shelf is attached to supporting frame and has hole before filtering coating and upper horizontal shelf extends through length of at least geometric size of narrowing nozzle. In addition, laid in clamps are flat flexible chambers connecting by flexible hose with each other and with pressure source. Flat flexible chambers have holes for connection with branch pipes of clamp vertical post. EFFECT: recovered conveying capacity of filter zone of bed. 2 dwg