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Turbine Rotor and Blade Assembly with Blind Holes

a technology which is applied in the field of turbine rotor and blade assembly, can solve the problems of inducing stress in the dovetail and adjacent areas, and affecting the and achieves the effect of reducing the fatigue life of the rotor cycl

Inactive Publication Date: 2013-12-12
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent is for a steam turbine with a special design for the turbine rotor and blades. The design includes a rotor, buckets, a locking blade, and a blind hole. The locking blade is securely attached to the rotor using a retention screw. The technical effect of this design is increased efficiency and reliability of the steam turbine.

Problems solved by technology

Such centrifugal loads and coincident thermally induced loads associated with loading transients may induce stresses in the dovetails and adjacent areas that attach the buckets to the rotor.
These stresses may be of sufficient magnitude to impact adversely rotor cycle fatigue life.

Method used

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  • Turbine Rotor and Blade Assembly with Blind Holes
  • Turbine Rotor and Blade Assembly with Blind Holes

Examples

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Embodiment Construction

[0011]Referring now to the drawings, in which like numerals refer to like elements throughout the several views, FIG. 1 is a schematic diagram of an example of a steam turbine 10 as may be used herein. The steam turbine 10 may include a first section 15 and a second section 20. The sections 15, 20 may be high pressure sections, intermediate pressure sections, and / or low pressure sections. Each of the sections 15, 20 may have a number of stages therein. An outer shell or casing 25 may be divided axially into upper and lower half sections 30, 35, respectively. A rotor shaft 40 may extend through the casing 25 and may be supported by a number of journal bearings 45. A number of seals 50 also may surround the rotor shaft 40 about the ends and elsewhere. A central section 55 may include one or more steam inlets 60. A flow splitter 65 may extend between the sections 15, 20.

[0012]In use, a flow of steam 70 passes through the steam inlets 60 and into the sections 15, 20 such that mechanical...

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PUM

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Abstract

The present application provides a turbine rotor and blade assembly for a steam turbine. The turbine rotor and blade assembly may include a rotor, a number of buckets positioned about the rotor, a locking blade positioned about the rotor, and a blind hole positioned about the rotor adjacent to the locking blade.

Description

TECHNICAL FIELD[0001]The present application and the resultant patent relate generally to turbo-machinery and more particularly relate to a turbine rotor and blade assembly for use with a steam turbine having redundant locking blade retention screw holes for reduced tangential stress.BACKGROUND OF THE INVENTION[0002]Steam turbine airfoils or buckets generally are positioned about a rotor at regular intervals in a bucket assembly. The bucket assembly may be created by inserting the buckets one at a time tangentially into an opening on the rotor and then sliding the buckets circumferentially about the rotor. The buckets may be attached to the rotor by complementary male and female dovetails and other configurations. In order to close the bucket assembly, however, the last bucket must be restrained by a feature other than a dovetail. This last bucket, generally called the locking blade or the closure bucket, may be affixed to the rotor via one or more blade retention screws and the lik...

Claims

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Application Information

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IPC IPC(8): F01D5/32
CPCF01D5/3023F01D5/303F01D5/3038F01D5/32F01D5/326F05D2260/941F05D2270/114
Inventor FARINEAU, THOMAS JOSEPHTISENCHECK, NICHOLAS ANDREWDEDE, MEHMET M.HOWES, JAMES ROYCE
Owner GENERAL ELECTRIC CO