초록 ▼

A unique finger dovetail pin configuration is provided to attach the buckets of a control stage of a turbine to the rotor wheel. More particularly, as an embodiment of the invention, a bore is provided through the center of the pin to form a hollow pin. The primary benefit of providing a hollow pin

A unique finger dovetail pin configuration is provided to attach the buckets of a control stage of a turbine to the rotor wheel. More particularly, as an embodiment of the invention, a bore is provided through the center of the pin to form a hollow pin. The primary benefit of providing a hollow pin configuration is that a passage is defined for the axial flow of steam through the dovetail attachment. For a control stage bucket, this axial flow is desirable to minimize the leakage of steam from the space between the first stage nozzle and bucket, and to provide a source of cooling flow to the forward side of the turbine wheel. Another benefit of the hollow pin is to facilitate removal of the pins when servicing of the high pressure rotor is required.

대표청구항 ▼

1. An assembly for locking a generally radially extending bucket to a wheel of a rotor of a turbine, the bucket having a plurality of bucket dovetail projections with a plurality of bucket dovetail slots defined therebetween, and the wheel having a plurality of generally radial wheel dovetail projec

1. An assembly for locking a generally radially extending bucket to a wheel of a rotor of a turbine, the bucket having a plurality of bucket dovetail projections with a plurality of bucket dovetail slots defined therebetween, and the wheel having a plurality of generally radial wheel dovetail projections with a plurality of dovetail slots defined therebetween, the bucket dovetail projections being received within respective wheel dovetail slots, and a plurality of dovetail pins being received through respective dovetail pin bores defined by aligned apertures defined in said bucket dovetail projections and said wheel dovetail projections, at least one said pin having a bore defined therethrough whereby said pin is hollow and defines a flow path for fluid flow therethrough from one axial side of the wheel to another, said bore of said pin being unobstructed during operation of said turbine so that fluid can flow therethrough from said one axial side of the wheel to the other during rotation of the rotor.