Improved connection of blades on a rotor disc of a gas turbine

F - Mech Eng,Light,Heat,Weapons – 01 – D

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F01D 5/30 (2006.01)

Patent

CA 2400289

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 the disc (22) which is complementary to the blade, wherein the root (10) is in the shape of 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 along a line which is inclined relative to the axis of the seat (20) by an angle 13, of between 17° and 23°, 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 between 42° and 48° whereas .alpha.2 is between 94° and 100°.

Mode de raccordement amélioré des ailettes (12) de disque de rotor (22) de turbine à gaz, dans lequel une racine (10) de chaque lame (12) est insérée dans un siège (20) du disque (22) qui est complémentaire à l'ailette, la racine (10) ayant la forme d'un triangle isocèle renversée, avec les deux côtés opposés qui convergent au niveau de la base, chacun ayant un profil cannelé de manière à former une série de dents (14) et avec une extrémité inférieure (16) de la racine (10) qui est formée par la connexion jointe de deux dents inférieures (14) des deux côtés de la racine (10), les dents (14) de la racine (10) correspondant aux rainures (24) dans le siège (20) et l'extrémité inférieure (16) de la racine (10) correspondant à une rainure d'extrémité (26) dans le siège (20). Cette série de rainures (24) s'étend le long d'une ligne qui est incliné par rapport à l'axe du siège (20) par un angle 13, variant entre 17° et 23°, et les rainures (24) ont des côtés droits avec des inclinaisons par rapport à l'axe du siège (20) ayant des angles .alpha.1 et .alpha.2, où .alpha.1 est entre 42° et 48°, tandis que .alpha.2 est entre 94° et 100°

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