Turbine blade assembly for retaining sealing and dampening elements

摘要

A turbine has blade assemblies disposed about a rotor. Each of the blade assemblies have an airfoil and a bucket. Pockets are defined at trailing and leading sides of the bucket, with damper pin slots at an ends thereof. The damper pin slot at the trailing side has a depth sufficient for fully receiving a damper pin. The damper pin slot at the trailing side of a first adjacent blade assembly is positioned relative to the damper pin slot at the leading side of a second adjacent blade assembly to allow the damper pin to move. At each side of the pocket at the trailing side is a seal pin slot with seal pins therein. The seal pin slots extend beyond a line that is aligned with an inner edge of the damper pin slot at the trailing side, wherein the seal pins overlap the damper pin.

主权项

1. A turbine having at least two adjacent blade assemblies circumferentially disposed about a rotor of the turbine, the turbine comprising:
each of the at least two adjacent blade assemblies having: a bucket having a platform with a first pocket defined at a trailing side of the bucket and a second pocket defined at a leading side of the bucket, the bucket further having a first damper pin slot at one end of the first pocket and a second damper pin slot at one end of the second pocket, and an airfoil projecting into a stream of the turbine, whereby kinetic energy of the stream is converted into mechanical energy through rotation of the rotor, the airfoil extending outwardly from the platform; and a damper pin received in at least one of (i) the first damper pin slot of a first of the at least two adjacent blade assemblies and (ii) the second damper pin slot of a second of the at least two adjacent blade assemblies, the first damper pin slot of the first of the at least two adjacent blade assemblies is positioned relative to the second damper pin slot of the second of the at least two adjacent blade assemblies to allow the damper pin to move within the first damper pin slot of the first of the at least two adjacent blade assemblies and the second damper pin slot of the second of the at least two adjacent blade assemblies, the first damper pin slot has a depth sufficient for fully receiving the damper pin therein and a concave surface disposed directly adjacent to a planar surface, wherein the first damper pin slot of the first of the at least two adjacent blade assemblies is positioned relative to the second damper pin slot of the second of the at least two adjacent blade assemblies by being skewed at an angle, which is about the same as an inner flow path angle of the turbine.