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Longitudinal wave ultrasonic detection method for axial assembly fir-tree root of steam turbine

A detection method and steam turbine technology, which are applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and measuring devices, etc. , to achieve the effect of small moving distance, improving labor efficiency and reducing labor costs

Inactive Publication Date: 2018-12-21
中国能源建设集团科技发展有限公司
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Problems solved by technology

Due to the large width of the blade root of the large generator set and the small detection surface, see figure 2 , according to the conventional ultrasonic detection method can not achieve the purpose of comprehensive detection

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  • Longitudinal wave ultrasonic detection method for axial assembly fir-tree root of steam turbine
  • Longitudinal wave ultrasonic detection method for axial assembly fir-tree root of steam turbine
  • Longitudinal wave ultrasonic detection method for axial assembly fir-tree root of steam turbine

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with examples and specific implementation methods. However, it should not be understood that the scope of the protection subject matter of the present invention is limited to the following embodiments, and all technologies implemented based on the contents of the present invention belong to the scope of the present invention. In order to avoid obscuring the essence of the present invention, well-known methods, procedures, procedures and components have not been described in detail.

[0034] In ultrasonic testing technology, the method of comparing with known artificial reflectors is usually used to determine the defect position and size of the inspected workpiece. The development of ultrasonic testing technology is always inseparable from the design and manufacture of reference test blocks. Therefore, it is necessary to develop and manufacture corresponding reference test blocks for the axial...

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Abstract

The invention discloses a longitudinal wave ultrasonic detection method for the axial assembly fir-tree root of a steam turbine, and belongs to the field of ultrasonic detection. The front edge distance of a transducer is measured through a fan-shaped test block which is arranged in a step shape, and the scanning speed of a detecting system is adjusted. The refraction angle of the transducer is measured through a circular hole with the diameter being phi 10 mm, and five holes with the diameter being phi 1 mm and the depth being 6 mm are adopted as a detecting system to debug an artificial defect reflecting body so as to verify the scanning speed of the detecting system, adjust the flaw detection sensitivity and draw a distance-amplitude curve. By combining with the structural characteristics of the axial assembly fir-tree root of the steam turbine, crack defects are detected through ultrasonic small angle longitudinal waves, and by combining with the reference test block special for ultrasonic detection of the axial assembly fir-tree root of the steam turbine, the basis is provided for adjusting of the detecting system. The problem that easily happened portions of cracks of the axial assembly fir-tree root of the large steam turbine cannot be detected comprehensively through traditional ultrasonic detection and surface flaw detection is solved.

Description

technical field [0001] The invention relates to a longitudinal wave ultrasonic detection method for axially assembled fir tree-shaped blade roots of a steam turbine, belonging to the field of ultrasonic detection. Background technique [0002] At present, thermal power generating units are developing in the direction of large units, large capacity and high parameters. The size of the steam turbine is also increased accordingly. The size of the blade and blade root of the steam turbine also increases accordingly, the length of the blade reaches more than 1 meter, and the width of the blade root also reaches more than 300 mm. The main types of steam turbine blade roots are T-shaped, fork-shaped, fir-tree-shaped and fungal-shaped. Blades and blade roots are subjected to great stress and torque during service, especially the corrosive working environment of the final blade, which is prone to stress corrosion cracks. When the crack size expands to the limit value, the blade an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/24G01N29/265G01N29/30
CPCG01N29/04G01N29/2437G01N29/265G01N29/30G01N2291/023G01N2291/0289G01N2291/0421G01N2291/269
Inventor 张昕宋绍河杨景建王鑫王欣周光刘耀志郭涛
Owner 中国能源建设集团科技发展有限公司
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