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Diaphragm for turbomachines and manufacturing method

A technology of guide vanes and turbines, applied in the field of guide vanes, can solve the complex cost of guide vanes and other problems

Inactive Publication Date: 2012-11-07
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Welding of baffles is a complex and costly process that requires additional post-weld heat treatment and final machining to correct distortion

Method used

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  • Diaphragm for turbomachines and manufacturing method
  • Diaphragm for turbomachines and manufacturing method
  • Diaphragm for turbomachines and manufacturing method

Examples

Experimental program
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Effect test

Embodiment Construction

[0020] Aspects and details of an example of the present invention will be described in further detail below first with reference to the description of the so-called "compact baffle" design shown in Figure 1, which reproduces commonly owned published U.S. Patent Application No. 2008 Relevant features of Figure 2 of / 0170939. Figure 1 is a schematic fragmentary radial cross-section of an axial flow turbine showing a fully assembled deflector positioned between successive annular rows 12, 13 of moving blades within the steam turbine.

[0021] Each of said moving blades is provided with a radially inner "T-tenon" portion 14 , 15 which sits in a corresponding groove 16 , 17 machined in the rim of the drum 18 . Each said moving blade is also provided with an outer shield 19 , 20 which seals the outer segment ring 21 , 22 with a seal 23 , 24 .

[0022] The inner casing 10 of the turbine comprises an annular row of static blades each having an airfoil portion 30, 31 whose radially in...

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PUM

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Abstract

The invention describes a turbine diaphragm assembly having an annulus of static blades, each static blade including at least an aerofoil and an outer platform; and an outer diaphragm ring or segments of a ring for holding the annulus of static blades. Confronting edges of the outer platforms and the ring are held by an interference fit designed to withstand the forces on the diaphragm during operation of the assembled turbine, when pushed in the axial direction into contact with the interference fit.

Description

technical field [0001] The present invention relates to a new baffle of the type used in axial turbines and a method of assembling said baffle. The invention relates particularly, but not exclusively, to steam turbine deflectors. Background technique [0002] The traditional method of constructing a turbine deflector is to install a ring of airfoil blades between the inner and outer rings. Each blade is formed as part of a blade unit in which the blade extends between an inner platform and an outer platform, the blade unit being machined as a single component. Each platform is in the form of a segment of a cylinder so that when the blade unit ring is assembled, the inner platforms combine to form an inner cylinder and the outer platforms combine to form an outer cylinder. The outer platform is welded to an outer ring that provides support and rigidity to the baffles. [0003] The inner platform is welded to the inner ring, preventing axial deflection of the turbine blades...

Claims

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Application Information

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IPC IPC(8): F01D9/02
CPCF01D9/042F05B2230/60F05D2230/60F05B2260/30F01D25/246F05D2260/30F05D2230/64
Inventor A·C·洛德P·D·汉斯莱
Owner GENERAL ELECTRIC TECH GMBH