Abstract

The present invention relates to an inlet for a hydrodynamic screw, the inlet comprising - a first end connectable to a hydrodynamic screw, the first end having a first opening - a second end for transporting water through the inlet towards the first end, the second end having a second opening, - an inlet body connecting the first end and the second end, the inlet body comprising a hollow that extends through the inlet body and connects the first opening and the second opening, wherein the inlet has a first diameter at the first opening and a second diameter at the second opening, the second diameter being larger than the first diameter, and wherein the inlet further comprises a ridge arranged on an inner surface of the hollow in a helix, the ridge having a height that increases towards the first end. The invention also relates to a hydrodynamic screw.

IPC Classes  ?

• F03B 7/00 - Water wheels
• F03B 11/00 - Parts or details not provided for in, or of interest apart from, groups

Abstract

Transporter and fish lock including an upper inlet and an upper outlet adapted to be in flow communication with an upper volume of water, and a lower outlet and a lower inlet adapted to be in flow communication with a lower volume of water. The upper inlet and the lower outlet communicate via a downstream passage having a first effective through-flow area, and the lower inlet and the upper outlet communicate via an upstream passage having a second effective through-flow area. The downstream passage includes a first helical rotor having a thread-direction that by a flow directed downstream causes the first rotor to rotate around its axis. The upstream passage includes a second helical rotor, wherein the rotors are mutually connected such that the first rotor drives the second rotor in rotation around its axis, and the second rotor has a thread-direction that upon rotation generates a flow directed upstream.

IPC Classes  ?

• E02B 8/08 - Fish passesPassages for rafts or boats
• F03B 7/00 - Water wheels
• E02B 1/00 - Equipment or apparatus for, or methods of, general hydraulic engineering
• F04D 3/02 - Axial-flow pumps of screw type
• F03B 3/10 - Machines or engines of reaction typeParts or details peculiar thereto characterised by having means for functioning alternatively as pumps or turbines