Dual-dovetail type unmovable key bar assembling and welding process for water turbine generator

A hydro-generator, mobile positioning technology, applied in arc welding equipment, manufacturing tools, welding equipment and other directions, can solve the problems of long installation cycle, affecting the accuracy of positioning rib installation and welding, positioning rib installation and adjustment, and complicated welding process. , to save the installation cycle, improve dimensional accuracy, and save the workload of repeated adjustment

Inactive Publication Date: 2010-06-30
HARBIN ELECTRIC MASCH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ALSTOM’s double dovetail non-removable positioning rib welding process, the positioning rib installation adjustment and welding process are complicated and cumbersome, and the welding deformation of the positioning rib cannot be controlled, which affects the positioning rib welding accuracy, and the installation period is long

Method used

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  • Dual-dovetail type unmovable key bar assembling and welding process for water turbine generator
  • Dual-dovetail type unmovable key bar assembling and welding process for water turbine generator
  • Dual-dovetail type unmovable key bar assembling and welding process for water turbine generator

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Experimental program
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Effect test

Embodiment Construction

[0015] A hydroelectric generator double dovetail non-removable positioning rib assembly welding process, the above method includes the following process steps:

[0016] (1) According to the welding experience value of Harbin Electric’s traditional structural positioning ribs (the support block has a circumferential weld) and the structural characteristics of the double dovetail positioning ribs, determine the lap welding radius process tolerance R of the double dovetail non-movable positioning ribs -0.15 +0.15 mm;

[0017] (2) The double dovetail positioning ribs are installed in equal parts with a large span, and the large span of the positioning ribs is an integer equal division of the total number of double dovetail positioning ribs, generally 3, 6, 8 or 9 equal divisions. Divide the accumulative error of positioning tendon distance adjustment equally among the major spans to reduce the circumferential accumulation of positioning tendon distance adjustment error values;

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Abstract

The invention provides a dual-dovetail type unmovable key bars assembling and welding process for a water turbine generator, which adopts a large-span equal division method to install key bars and welds the other key bars by lap welding the template within each large span. The key bar radius, radial skew angle, radius difference of adjacent bars and chord length difference of adjacent bars are adjusted up to standards by a support block C-shaped clip and other tools. The support block is welded by CO2 arc welding, the welding direction is from inner side to outer side, in order to whole controlling the welding deformation direction of the key bar chord length. The support block among each base ring plate are welded by skip welding, the radial bending welding deformation of the key bar is reduced. The invention has the advantages of simple and concise welding process, convenient assembly operation, high precision of key bar welding, high production efficiency and short assembly circle.

Description

technical field [0001] The invention relates to a process for installing and welding double dovetail non-movable positioning ribs of a hydroelectric generator. Background technique [0002] The double dovetail non-movable positioning rib structure of the hydro-generator is the unique patented structure introduced by ALSTOM company. According to the assembly and welding process of ALSTOM company, the arc-shaped radius adjustment plate is first spot-welded on the upper and lower ring plates of the stator frame, and the radius adjustment is measured. Two points on the inner diameter of the plate to determine its position, and then the positioning rib is leaned against the radius adjustment plate, and after the stator punching is used to adjust the chord distance of the positioning rib, remove the radius adjustment plate, and use jump welding positioning ribs according to each layer of the ring plate of the machine base block. ALSTOM’s double dovetail non-removable positioning ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235
Inventor 韩旭东刘平安张行明李兴平
Owner HARBIN ELECTRIC MASCH CO LTD
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