Rotor for a centrifugal flow machine and a centrifugal flow machine

A rotor for a centrifugal flow machine, the rotor comprising:

• a hub with an axis and device configured to couple the rotor, when in use, on a shaft of the flow machine including a sealing chamber;
• and
• at least one working vane extending outwardly from the hub, the working vane having a front edge, a leading edge, a trailing edge, a rear face, a leading surface and a trailing surface, the rear face, when in use, facing the sealing chamber, the working vane being formed of a root portion and a vane portion integrated to one another, the working vane being fastened to the hub solely by the root portion, the root portion having, when joined to the hub, a substantially trapezoidal or triangular cross section having sides representing a leading face, a trailing face, a rounded front edge between the leading face and the trailing face and the rear face opposite to the front edge of the root portion, the rear face of the at least one working vane forming a sharp angle with a circumferential direction, the sharp angle opening in a direction of rotation of the rotor for pumping fluid towards the sealing chamber for flushing the sealing chamber.