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Steam turbine nozzle segment with complete sidewall and integrated hook design

A steam turbine, segmental technology, applied in the direction of mechanical equipment, blade support elements, machines/engines, etc., can solve problems affecting performance, lack of

Inactive Publication Date: 2017-06-30
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even further, welding causes deformation in the vapor flow path, which can adversely affect performance
Lack of avenues to work around weld configurations (eg, integrated sidewall airfoil designs) as they require additional components and fabrication to effectively cover the forward flow path

Method used

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  • Steam turbine nozzle segment with complete sidewall and integrated hook design
  • Steam turbine nozzle segment with complete sidewall and integrated hook design
  • Steam turbine nozzle segment with complete sidewall and integrated hook design

Examples

Experimental program
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Effect test

Embodiment Construction

[0119] The subject matter disclosed herein relates to steam turbines. In particular, the subject matter disclosed herein relates to nozzle segments in steam turbines.

[0120] According to various embodiments of the present disclosure, a steam turbine nozzle segment includes an airfoil and a sidewall coupled (eg, in some cases integral) to the airfoil, wherein the sidewall includes a ( The front) hook and the first notch (also called the first groove) near the hook extending axially forward, and the (rear) hook extending axially downstream and the first notch near the hook extending axially downstream Second notch. The front hook is sized to engage a first notch in the nozzle cover and the rear hook is sized to engage a second notch in the diaphragm ring of the turbine. In various embodiments, the nozzle cover is a separate component connected to the outer ring that can be coupled and disconnected from the outer ring, eg, to improve access to the nozzle segments. In other c...

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PUM

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Abstract

Various embodiments include a steam turbine (2) diaphragm nozzle segment (20), related assembly and steam turbine (2). Particular embodiments include a steam turbine (2) diaphragm nozzle segment(20) having: an airfoil (22) having a contact surface (24) for directing a flow of working fluid through a flow path (26); and a sidewall coupled with the airfoil (22) and at least partially radially outboard of the airfoil (22), the sidewall having: a body contacting the airfoil (22); an axially upstream-extending hook extending axially from the body; a first notch adjacent the axially upstream-extending hook (34); an axially downstream-extending hook extending axially (36) from the body (30); and a second notch (40) adjacent the axially downstream-extending hook (36).

Description

technical field [0001] The subject matter disclosed herein relates to steam turbines. In particular, the subject matter disclosed herein relates to nozzle segments in steam turbines. Background technique [0002] A steam turbine includes a stationary nozzle assembly that directs a flow of working fluid into turbine buckets that are connected to a rotating rotor. A nozzle structure (comprising multiple nozzles, or "airfoils") is sometimes referred to as a "diaphragm" or "nozzle assembly stage." The steam turbine diaphragm consists of two halves which are assembled around the rotor creating a horizontal joint between the two halves. Each turbine diaphragm stage is vertically supported by support bars, support lugs or support screws on each side of the diaphragm at the respective horizontal joint. The horizontal joints of the diaphragm also correspond to the horizontal joints of the turbine casing surrounding the steam turbine diaphragm. [0003] The current approach for we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D9/02F01D5/14F01D25/24
CPCF01D5/14F01D9/02F01D25/24F01D9/041F01D9/042F01D25/246F05D2220/31F05D2240/128F05D2260/30F01D5/02
Inventor S.S.伯德吉克
Owner GENERAL ELECTRIC CO