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Laser cladding structure of steam turbine blade air inlet side

A technology for steam turbine blades and laser cladding, which is applied to the supporting elements of blades, mechanical equipment, engine elements, etc., can solve the problems of easy water erosion and failure of the cladding layer, save production energy and production time, and save cladding metal powder. , Reduce the effect of blade deformation

Inactive Publication Date: 2015-04-22
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a laser cladding structure for the inlet edge of the steam turbine blade, which can solve the problem that the laser cladding groove structure of the steam inlet edge of the existing steam turbine blade is close to each other in the longitudinal section of the blade due to the same longitudinal sections. The cladding layer on the blade top is prone to water erosion and failure, so as to improve the water erosion resistance of the laser cladding layer on the steam outlet side of the blade and prolong the service life of the turbine blade

Method used

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  • Laser cladding structure of steam turbine blade air inlet side
  • Laser cladding structure of steam turbine blade air inlet side

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A steam turbine blade with a blade body length of 25 inches has a laser cladding area length of 200mm. Its groove shape is as follows:

[0023] The cross-sectional shape of the tip position is that the fillet RA is R40mm, the fillet RB is R1.5mm, the length a is 6mm, the length b is 13.4mm, and the length c is 2mm;

[0024] The cross-sectional shape at a distance of 50mm from the blade tip is R40mm for rounded corner RA, R1.5mm for rounded corner RB, length a is 5.1mm, length b is 12.5mm, and length c is 2mm;

[0025] The cross-sectional shape at a distance of 100mm from the blade top position is that the rounded corner RA is R40mm, the rounded corner RB is R1.5mm, the length a is 4.2mm, the length b is 11.2mm, and the length c is 2mm;

[0026] The section shape at a distance of 150mm from the tip of the blade is that the rounded corner RA is R40mm, the rounded corner RB is R1.5mm, the length a is 4.2mm, the length b is 11.2mm, and the length c is 2mm;

[0027] The cr...

Embodiment 2

[0032] A steam turbine blade with a blade body length of 67 inches has a laser cladding area length of 900mm. Its groove shape is as follows:

[0033] The cross-sectional shape of the blade tip position is that the fillet RA is R60mm, the fillet RB is R4mm, the length a is 8.0mm, the length b is 22mm, and the length c is 6mm;

[0034] The cross-sectional shape at a distance of 200mm from the tip of the blade is that the fillet RA is R60mm, the fillet RB is R4mm, the length a is 6.4mm, the length b is 18.4mm, and the length c is 6mm;

[0035] The cross-sectional shape at a distance of 400mm from the tip of the blade is that the rounded corner RA is R60mm, the rounded corner RB is R4mm, the length a is 4.7mm, the length b is 14.8mm, and the length c is 6mm;

[0036] The cross-sectional shape at a distance of 600mm from the tip of the blade is that the rounded corner RA is R60mm, the rounded corner RB is R4mm, the length a is 3.1mm, the length b is 11.2mm, and the length c is 6m...

Embodiment 3

[0042] A steam turbine blade with a blade body length of 75 inches has a laser cladding area length of 900mm. Its groove shape is as follows:

[0043] The cross-sectional shape of the blade tip position is that the fillet RA is R50mm, the fillet RB is R3mm, the length a is 8.0mm, the length b is 30mm, and the length c is 7mm;

[0044] The cross-sectional shape at a distance of 200mm from the tip of the blade is that the fillet RA is R50mm, the fillet RB is R3mm, the length a is 7.0mm, the length b is 24.7mm, and the length c is 7mm;

[0045] The cross-sectional shape at a distance of 400mm from the tip of the blade is that the rounded corner RA is R50mm, the rounded corner RB is R3mm, the length a is 6.0mm, the length b is 19.4mm, and the length c is 7mm;

[0046] The cross-sectional shape at a distance of 600mm from the blade tip is R50mm for rounded corner RA, R3mm for rounded corner RB, length a is 4.9mm, length b is 14.1mm, and length c is 7mm;

[0047] The cross-section...

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Abstract

The invention provides a laser cladding structure of a steam turbine blade air inlet side. The problem that according to an existing steam turbine blade steam inlet side laser cladding slope structure, longitudinal sections are the same, so that cladding layers close to the blade tops on the blade longitudinal sections can be subjected to water erosion easily and lose efficacy can be solved. Accordingly, the anti-water-erosion capacity of a blade steam outlet side laser cladding layer is improved, and the service life of a steam turbine blade is prolonged. The structure comprises a laser cladding layer. A cladding slope which extends from the blade top to the blade root is formed in one side of the air inlet side of the steam turbine blade, and the laser cladding layer is arranged in the cladding slope in a cladding mode. The laser cladding structure is characterized in that the width and the thickness of the longitudinal section of the laser cladding layer are reduced gradually to zero from the blade top to the blade root, the length L of the laser cladding layer is 200 mm-900 mm, and the width and the thickness of the longitudinal section of the laser cladding layer are determined by the cladding slope structure.

Description

technical field [0001] The invention relates to the technical field of steam turbine blade processing, in particular to the field of laser cladding of the inlet edge of the steam turbine blade, in particular to the laser cladding structure of the inlet edge of the steam turbine blade. Background technique [0002] The last-stage blade of the steam turbine operates in a relatively high steam humidity environment, and the blade tip suffers cavitation failure during high-speed rotation. Therefore, the water erosion resistance of the blade directly affects the service life of the turbine blade and the safe operation of the unit. The traditional anti-corrosion strengthening method is to use brazing Stellite alloy sheet on the inlet edge of the steam turbine blade. The thickness of the alloy sheet is 0.8~1.5mm and the thickness of the alloy sheet is uniform. However, the position of the inlet edge has different requirements for water erosion resistance. In the case of the same thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/28
Inventor 张铁磊杨敏范菲王烜烽
Owner WUXI TURBINE BLADE
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