Turbine blade and non-integral platform with pin attachment

摘要

Platforms (36, 38) span between turbine blades (23, 24, 25) on a disk (32). Each platform may be individually mounted to the disk by a pin attachment (42). Each platform (36) may have a rotationally rearward edge portion (50) that underlies a forward portion (45) of the adjacent platform (38). This limits centrifugal bending of the rearward portion of the platform, and provides coolant sealing. The rotationally forward edge (44A, 44B) of the platform overlies a seal element (51) on the pressure side (28) of the forwardly adjacent blade, and does not underlie a shelf on that blade. The pin attachment allows radial mounting of each platform onto the disk via tilting (60) of the platform during mounting to provide mounting clearance for the rotationally rearward edge portion (50). This facilitates quick platform replacement without blade removal.

主权项

1. A turbine blade and platform apparatus, comprising:
first and second turbine blades, each blade comprising a pressure side, a suction side, and a shank portion, wherein the shank portion is mounted to a turbine disk; and a first platform spanning between the pressure side of the first turbine blade and the suction side of the second turbine blade; wherein the first platform is non-integral with the turbine blades, is mounted to the turbine disk between the first and second blades, and comprises:
a first rotationally forward edge portion that overlies a seal element on the pressure side of the first turbine blade and does not underlie a ledge on the pressure side of the first turbine blade;a first rotationally rearward edge portion that underlies a shelf on the suction side of the second turbine blade; andthe first platform is configured for radial installation and removal between the mounted first and second turbine blades without removal of said blades.