FISH PASS Russian patent published in 2007 - IPC E02B8/08 

FIELD: hydraulic structures, particularly permitting fish passage through support structures to fish hatchery and growth areas.

SUBSTANCE: fish pass comprises fish passing path made as pressure conduit with round cross-section having outlet head connected with upper hydrosystem pool and inlet heat communicated with lower pool thereof. Roughness members made as auger blades are formed on inner surface of pressure conduit and arranged along conduit length. The roughness members create transversal partitions having outer edges, which define swimming-in orifices having axes aligned with that of pressure conduit. Fish passing path rotation drive is made as blades installed on outer surface of pressure conduit and arranged in cylindrical chamber, which is created in dam body and is coaxial to pressure conduit. Pressure conduit journal bearings are arranged from the sides of upper and lower hydrosystem pools and are aligned with inlet and outlet heads. Fish pass is provided with supply waterways, discharge galleries and additional journal bearings. Auger blades are water-permeable and defined by flexible rod rows. Cylindrical chamber diameter exceeds that of through channel adapted to receive pressure conduit. Cylindrical chamber is spaced equal distances from inlet and outlet heads provided with fixed support barrels. The barrels are installed along outer pressure conduit perimeter. End parts of support barrels facing away from dam are provided with central axial swimming-in orifices having diameters less than pressure conduit diameter. Journal bearings thereof are made as cylindrical rollers with horizontal axes of rotation. The axes are fastened to inner end surface of fixed support drums and spaced along outer pressure conduit perimeter. Axes of additional journal bearing rotation extend in vertical plane and extend in radial direction with respect to longitudinal pressure conduit axis. Additional journal bearings are made as cylindrical rollers opposite to end parts of pressure conduit from the sides of inlet and outlet fish passing path ends. Supply waterways are tangentially communicated with upper and lower parts of cylindrical chamber. Working orifices of supply waterways are transversal to fish passing path rotation blades and oriented in the same direction. End parts of supply waterways are communicated with discharge galleries.

EFFECT: improved fish movement conditions in fish passing path.

12 dwg