IMPROVED CONNECTION OF BLADES ON A ROTOR DISC OF A GAS TURBINE

摘要

An improved connection of blades (12) on a rotor disc (22) of a gas turbine, of the type in which a root (10) of each blade (12) is inserted in a seat (20) of t he disc (22) which is complementary to the blade, wherein the root (10) is in the shape o f an overturned isosceles triangle, with the two sides which converge at the base each having a grooved profile such as to form a series of teeth (14) and with a lower end (16) of the root (10) which is formed by the joined connection of the two lower teeth (14) of the two sides of the root (10), the teeth (14) of the root (10) corresponding to grooves (24) in the seat (20) and the lower end (16) of the root (10) corresponding to an end groove (26) in the seat (20). This series of grooves (24) extends alo ng a line which is inclined relative to the axis of the seat (20) by an angle .beta.1 of between 17.degree. and 23.degree., and the grooves (24) have straight sides with inclinations relative to the axis of the seat (20) of angles .alpha.1 and .alpha.2, wherein .alpha.1 is betwee n 42.degree. and 48.degree. whereas .alpha.2 is between 94.degree. and 100.degree..