Patent ID: 8186959
Filing Date: 2012-05-29
Classification: F01D

Abstract:
1. A turbine moving blade assembly comprising: a plurality of moving blades arranged in a circumferential direction of a rotor of a turbine; an airfoil portion of each of moving blades twisted, in a sectional shape, from a root portion of the blade to a tip portion thereof; a shroud formed integrally with the tip portion of the moving blade; and a coupling member disposed to front end portion of the moving blades including the tip portion of the moving blade and the shroud so as to connect all the moving blades in one group, wherein the coupling member has: a primary contact face portion, which has flat contact faces forming an acute angle from a rotating direction of the turbine toward an outlet side in an axial direction of the rotor of the turbine and facing the tip portions of the turbine moving blades adjacent to each other in the circumferential direction; a secondary contact face portion which has flat contact faces forming an obtuse angle from the rotating direction of the turbine toward the outlet side in the axial direction of the rotor and facing the tip portions of the turbine moving blades adjacent to each other in the circumferential direction, the respective primary contact face portions of the turbine moving blades are in a separated state during assembly of the blades, the respective secondary contact face portions of the turbine moving blades are in a contacting state during assembly of the blades, and as a rotor speed increases, the respective second contact face portions of the turbine moving blades shift from the contacting state to the separated state, and thereafter, as the rotor speed further increases, the primary contact face portions shift from the separated state to the contacting state of the turbine moving blades adjacent to each other in the circumferential direction.