An impeller (20) for a rotor (10) of a turbomachine (1), the impeller (20) comprising:
- a wheel disc (30), arranged on a rotor shaft of the rotor (10) and having a plurality of grooves (32), the grooves (32) being arranged so as to be distributed along an outer circumference (31) of the wheel disc (30), each of the grooves (32) having a groove base (32a), and each of the grooves extending in a thickness direction of the wheel disc (30) running axially of the rotor shaft, wherein a groove side tooth profile (33) is formed on two groove sides of each groove (32) located opposite one another and running parallel to the thickness direction;
- and
- a plurality of moving blades (40), each having a blade root (41) with two blade root sides running parallel to the thickness direction and facing away from one another, on each of which a blade root tooth profile (43) is formed,
- wherein each of the moving blades (40) is configured to form a moving blade-groove combination when inserted with its blade root (41) into a respective one of the grooves (32), so that the blade root tooth profiles (43) of the blade root sides are in engagement with the groove side tooth profiles (33) of the groove sides,
- wherein each moving blade-groove combination comprises a fixing device (50) configured to fix the moving blade (40) against movement in the groove (32) both in the thickness direction as well as in a radial direction (RR) of the wheel disc (30), and
- wherein each fixing device (50) comprises a recess (51) closed on both sides at least in the thickness direction in an underside (44) of the moving blade (40) facing the groove base (32a), and a bar (52) is moveably received in the groove base (32a) so that the bar (52) is adjustable in the radial direction (RR) in a controlled manner between an unlocking position, in which the bar (52) does not engage in the recess (51) of the moving blade (40) and a locking position, in which the bar (52) radially engages in the recess (51) of the moving blade (40), so that the bar presses the moving blade (40) radially to the outside with a predetermined force.