WATER-INTAKE DEVICE Russian patent published in 1998 - IPC

FIELD: water supply structures. SUBSTANCE: devices and mechanisms intended for utilization of underground water and also to structures intended for pumping out artesian water and delivering it to trunk pipelines feeding municipal water supply systems. Water-intake device incorporates following components located in casing pipe of well: pressure head pipeline, multisectional pump with subsurface electric motor, and hydraulic sealing unit which has body and sealing member. Internal space of hydraulic sealing unit is connected with higher pressure line laid along pressure head pipeline. Body of hydraulic sealing unit is installed on float with possibility for reciprocating movement along axis of pressure head pipeline. Body of hydraulic sealing unit is made in the form of two flanges which are rigidly connected together by studs. Sealing member of hydraulic sealing unit is made in the form of internal inflatable cylindrical chamber and external inflatable cylindrical chamber which both are installed on body flanges. Space between inflatable chambers is connected with higher pressure line. This allows for aligning working plane of hydraulic sealing unit with static water level in well, that is to deepen rarefaction of air medium above its dynamic level and consequently to increase capacity of water intakes. EFFECT: higher efficiency. 1 dwg