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Turbine rotor blade root attachments

A blade root, root technology applied in the direction of blade support elements, engine elements, machines/engines, etc., capable of solving problems such as increased

Active Publication Date: 2014-02-12
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem is further compounded when the steam contains impurities that accelerate corrosion

Method used

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  • Turbine rotor blade root attachments
  • Turbine rotor blade root attachments
  • Turbine rotor blade root attachments

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Embodiment Construction

[0028] figure 1 and figure 2 Denotes prior art and is described above under the heading "Background". In this design, the stress levels in the disk fingers and blade fingers are equal along the lines of the outer row of pins due to the approximately uniform ratio of disk finger thickness to blade finger thickness. During rotation, the turbine rotor blades experience very large centrifugally induced loads which are reacted by the blade fingers and pins against the disk fingers. As previously mentioned, rotor disk fingers 201 are more susceptible to SCC damage, at least along the outer row of holes 209, than blade fingers 141 made of high alloy steel, since the rotor disk is made of low alloy steel. Made of steel. The concepts disclosed herein reduce the risk of SCC by changing some dimensions of the pinned root fixture, thereby reducing the peak stress exerted by the pins on the disc fingers during disc rotation. image 3 and Figure 4 Dimensional changes due to implement...

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Abstract

A process to mitigate stress corrosion cracking (SCC) in pinned root fixings of axial flow steam turbine rotor discs made of a low alloy. Such pinned root fixings 30 comprise pins 303 running axially through bores 305 in inter-digitated (interleaved) blade root fingers 141 ( Fig. 1 ) and disc fingers 301. The process includes at least the steps of: (i) increasing the value of the ratio b / M by an amount in the range of about 0.4 to about 0.6, where b is the axial breadth of the disc fingers 301and M is the sum of b and the axial breadth G of the gap between adjacent disc fingers, thereby to obtain an increase in the breadth b of the disc fingers and a corresponding reduction in the breadth G of the gap between adjacent disc fingers; (ii) reducing the breadth of the blade fingers to match the reduction in the breadth G of the gap between adjacent disc fingers; and (iii) judiciously increasing the diameter D of the pins and the bores in a row of bores 305 in the disc fingers, thereby reducing peak stress in the disc fingers 301.

Description

technical field [0001] The present disclosure relates to turbine rotor blades for axial flow steam turbines, and in particular, to attaching rotor blade roots to turbine rotor disks or drums using pinned root fixtures with improved resistance to stress corrosion cracking (SCC) . Background technique [0002] Well-known ways of mounting turbine blades around the periphery of a turbine rotor, as described in German patent application DE 10 2008 031 780 A1, include the so-called "pin root fastening", in which, on the periphery of the turbine rotor disc, Radially and circumferentially extending flanges called "disc fingers" and corresponding "blade fingers" on the root of the turbine blade are interleaved with each other and are connected by means of pins called "pins". A cylindrical metal rod is secured together, which passes axially through the blade fingers and the disk fingers. These arrangements are known in particular for use on impulsive vane sets under wet steam condit...

Claims

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Application Information

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IPC IPC(8): F01D5/30
CPCF01D5/3053F05D2220/31
Inventor A.布古恩M.弗洛奇J.勒迈雷
Owner GENERAL ELECTRIC TECH GMBH