METHOD FOR FISH-ARRESTING SCREEN FORMING AND FISH-PROTECTIVE DEVICE OF WATER INTAKE STRUCTURE Russian patent published in 2007 - IPC E02B8/08 

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

SUBSTANCE: fish-protective device includes means to create fish-arresting screen in water stream and tubular accumulation means perforated in upper part thereof and connected to waterway bottom. The fish-arresting means is made as air bubble curtain closing water intake channel throat and includes serially connected pump, water-pressure pipeline with flap valve and hydrodynamic cavitational unit provided with air-sucking pipe. Hydrodynamic cavitational unit outlet is linked to perforated tubular accumulation means inlet. Perforated tubular accumulation means has rectangular perforation orifices having jet-forming nozzles. Perforation orifices are arranged so that orifice edges having larger dimensions are parallel to longitudinal tubular accumulation means axis. Jet-forming nozzles are grouped in two rows so that jet-forming nozzles of the first row are displaced with respect to that of another row for distance equal to perforation orifice pitch. Resonance plates are installed opposite to jet-forming nozzles and are coaxial thereto. The resonance plates are secured in node points.

EFFECT: increased fish-arresting screen efficiency.

13 cl, 16 dwg