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Steam turbine rotor with mechanically coupled high and low temperature sections using different materials

a technology of steam turbines and rotors, applied in the direction of boats, marine propulsion, chairs, etc., can solve the problems of becoming difficult and expensive to manufacture rotors

Inactive Publication Date: 2012-07-12
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]In a first exemplary but non-limiting embodiment, this invention relates to a turbine rotor comprising an elongated shaft including at least an HP region, the HP region having a first axial section supporting a stage 1 rotor wheel and a second axial section supporting a st...

Problems solved by technology

But as rotors have become larger in recent years, it is becoming difficult and expensive to manufacture the rotor so as to satisfy characteristics both of the high temperature portion and the low temperature portion with one material.

Method used

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  • Steam turbine rotor with mechanically coupled high and low temperature sections using different materials
  • Steam turbine rotor with mechanically coupled high and low temperature sections using different materials
  • Steam turbine rotor with mechanically coupled high and low temperature sections using different materials

Examples

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Embodiment Construction

[0013]With reference initially to FIG. 1, a steam turbine rotor 10 is shown in schematic from and includes at least a high pressure (HP) region (or combined HP and intermediate pressure (IP) region) 12 that is formed to include at least first and second stage rotor wheels 14, 16, each of which supports a row of buckets 18, 20, respectively. Within the HP or combined HP / IP region 12, the rotor 10 is formed in two axially-oriented and aligned sections 22, 24. Section 22 includes the first stage rotor wheel 14 while section 24 includes the second stage rotor wheel 16. It will be appreciated that section 22 is in a high temperature region, exposed to steam at temperatures of about and above 1050° F. Section 24, on the other hand, is in a lower temperature region, exposed to steam at a temperature of about and less than 1050° F.

[0014]The inventors have recognized that significant cost savings can be realized by using different materials for the rotor sections 22, 24 within the HP or comb...

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Abstract

A turbine rotor including an elongated shaft having at least an HP region, the HP region having a first section supporting a stage 1 rotor wheel and a second section supporting a stage 2 rotor wheel, the first section formed of a relatively higher-temperature-capability material and the second section formed of a relatively lower-temperature-capability material. Various mechanical couplings and described for securing the first and second sections.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to rotors for turbomachines and, more specifically, to the construction of rotors in axial sections of different materials.[0002]In a recent steam turbine rotor, and following a tendency to high temperatures for steam, a 12% chromium steel is used, as it is excellent in high temperature strength and toughness. In such a rotor, both for a high temperature portion exposed to a high temperature steam and a low temperature portion exposed to a low temperature steam, the same 12% chromium steel is used. But as rotors have become larger in recent years, it is becoming difficult and expensive to manufacture the rotor so as to satisfy characteristics both of the high temperature portion and the low temperature portion with one material.[0003]While the expensive 12% chromium steel satisfies the required heat resistance, creep characteristics, etc. of the portion exposed to the high temperature steam, it is not necessary to use such an e...

Claims

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Application Information

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IPC IPC(8): F01D25/00
CPCF01D5/026F05D2300/50212F05D2300/502F01D5/066
Inventor PARASHAR, DUTTATREYKUMAR, SANDEEP
Owner GENERAL ELECTRIC CO
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