HYDRAULIC MULTISTAGE TURBINE OF TURBODRILL

摘要

A hydraulic multistage turbine each stage of which comprises a stator and a rotor having rings with flow channels and hubs carrying the bladings. There are stages wherein the blades of the bladings are made with an angle of curvature of the camber line greater than an angle formed by the tangent to this line at the exit of the blading and the axis of drilling fluid flow. In a stage wherein the ring has such blades it is provided with by-pass channels arranged hydraulically parallel to the flow chann of the ring and communicating the space between this ring and an up stream ring with a space between this ring and a downstream ring for discharging part of the drilling fluid from the flow channel.