Patent ID: 9605545
Date: 2017-03-28
CPC Classifications: F01D

Claim:
1. A hollow blade comprising: an airfoil extending along a longitudinal direction; a root; a tip; an internal cooling passage inside the airfoil; a cavity situated in the tip, being open towards a free end of the blade and defined by an end wall and a rim, the rim extending between a leading edge and a trailing edge and including a suction side rim along a suction side and a pressure side rim along a pressure side; cooling channels connecting the internal cooling passage with the pressure side, the cooling channels sloping relative to the pressure side; a stack of airfoil sections of the blade at a level of the rim of the blade tip including an offset of both the suction side rim and the pressure side rim towards the pressure side, the offset increasing on approaching the free end of the tip of the blade, wherein the pressure side wall of the airfoil includes a projecting portion with more than half of its length extending along a longitudinal portion of the internal cooling passage, and with an outside face that slopes relative to a remainder of the pressure side of the airfoil, and including a terminal face at its end facing towards the rim, the end wall being connected to the pressure side wall at a location of the end of the projecting portion and the cooling channels being arranged in the projecting portion to open out in the terminal face of the projecting portion, wherein a distance between axes of the cooling channels and an outer limit of the free end of the pressure side rim is greater than or equal to a non-zero minimum value; wherein a thickness of the pressure side wall of the airfoil is substantially constant in the projecting portion and in the remainder of the pressure side wall.