FISH-PROTECTIVE DEVICE OF WATER INTAKE STRUCTURE Russian patent published in 2008 - IPC E02B8/08 

FIELD: hydraulic building, particularly fish-protective structures included in water intakes.

SUBSTANCE: fish-protective structure comprises suction pipe arranged in water stream and connected to sucking line of pump, filtering screen coaxial to suction pipe and water washing means installed at filtering screen top and coaxial thereto. Filtering screen is made as truncated cone having major base arranged from suction pipe side. Water washing means may rotate about horizontal axis and is connected to pressure line of pump through supply pipeline. Water washing means has main and additional nozzles. Main nozzles are formed on water washing means chamber and arranged from outer side of filtering screen so that outlet orifices thereof face truncated cone base. Additional nozzles are arranged in plane transversal to filtering screen axis and are connected to outer surface of water washing means chamber so that additional nozzles are inclined with respect thereto. Outlet orifices of additional nozzles are unidirectionally oriented. Flow directing members are arranged inside filtering screen so that they are coaxial thereto and distributed along filtering screen length. Outer edges of flow directing members adjoin inner filtering screen surface and create water intake sections defined between flow directing members. The flow directing members are made as truncated cones having major bases facing filtering screen top. Water conveyance path is made as pipe and is coaxial to suction pipe and filtering screen. The pipe connects water-intake sections with suction pipe. Minor bases of truncated cones defined by flow directing members adjoin water conveyance path. Water intake orifices of suction pipe are made inside filtering screens and are distributed along length thereof. Water conveyance path is made as independent coaxially arranged pipes, which form annular water intake orifices of suction pipe in-between. End parts of independent coaxial pipes are inserted inside suction pipe. Beginning parts thereof are rigidly connected to minor bases of truncated cones of flow directing members.

EFFECT: increased fish-protective efficiency due to improved filtering rate field distribution over filtering screen surface.

16 cl, 23 dwg