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Steam turbine nozzle vane and its production method, nozzle rings using the vane and steam turbine

A technology for nozzle blades and steam turbines, which is applied in the field of nozzle blades and the manufacture of said nozzle blades, and can solve the problems that the contour accuracy of nozzle blades cannot be achieved.

Active Publication Date: 2007-01-17
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two known methods do not achieve a sufficient contour accuracy of the effective surface of the nozzle vane

Method used

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  • Steam turbine nozzle vane and its production method, nozzle rings using the vane and steam turbine
  • Steam turbine nozzle vane and its production method, nozzle rings using the vane and steam turbine
  • Steam turbine nozzle vane and its production method, nozzle rings using the vane and steam turbine

Examples

Experimental program
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Embodiment Construction

[0029] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0030] refer to figure 1 , the nozzle vane 21 in the first embodiment of the present invention has a nozzle vane main body 22 (hereinafter referred to as "vane main body" for simplicity). A recess 23 is formed in the front side surface of the main body 22 at the tip portion of the blade main body 22 . The recess 23 is covered with a cover plate 24 , whereby an inner space 25 is delimited in the nozzle vane 21 by the recess 23 and the cover plate 24 . Slits 26 or elongated openings are formed in the cover plate 24 . The slits 26 extend in the longitudinal direction of the nozzle vanes 21 , ie in the radial direction of the nozzle ring. The inner cavity 25 communicates with the outside of the nozzle vane 21 through a slit 26 . Another slit 26' is formed in the backside surface of the vane body 22, the slit 26' The interior space 25 opens in...

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PUM

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Abstract

Disclosed is a hollow nozzle blade having drain-discharging function and its fabricating method. A blade main body (22) is formed by die-forging process. A recess (23) is formed in the outer surface of the blade main body (22) by the die-forging process. The recess (23) is covered with a cover plate (24) attached to the blade main body (22), whereby an inner cavity (25) is formed in the nozzle blade (21).

Description

technical field [0001] The present invention generally relates to a steam turbine, and in particular to a hollow nozzle vane of a nozzle ring and a method of producing the same. The nozzle ring is configured to prevent the rotor blades on the downstream side of the nozzle ring from being eroded due to the blow-off liquid contained in the steam colliding with the rotor blades, and also to prevent the eventual degradation of the performance of the steam turbine. Background technique [0002] In most turbine stages of nuclear and geothermal turbines, and in the low pressure turbine stages of thermal turbines, part of the steam (working fluid) is condensed into effluent (ie water droplets). Due to the centrifugal force exerted on the discharge liquid, the discharge liquid collects around the peripheral area of ​​the nozzle ring, moves mainly on the tip parts of the nozzle vanes and on the inner circumferential surface of the outer ring of the nozzle ring, and is connected with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D9/02
CPCF05D2250/182F01D9/041F05D2220/31F05B2250/182F05B2220/301F01D5/147F01D25/32B23P15/04
Inventor 前野敦
Owner KK TOSHIBA