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Method for eliminating deformation of split closing port of low-pressure hollow partition outer ring of steam turbine

A technology of hollow partitions and steam turbines, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve problems such as inward deformation, achieve the effects of eliminating deformation, reducing radial misalignment rate, and improving quality

Active Publication Date: 2019-06-07
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of inward deformation of the facet closure of the outer ring when the low-pressure hollow diaphragm of the conventional steam turbine unit is welded, and to provide a method for eliminating the deformation of the facet closure of the outer ring of the low-pressure hollow diaphragm of the steam turbine

Method used

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  • Method for eliminating deformation of split closing port of low-pressure hollow partition outer ring of steam turbine

Examples

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Effect test

specific Embodiment approach 1

[0017] Specific embodiment one: In this embodiment, a method for eliminating the deformation of the facet closure in the outer ring of the low-pressure hollow partition of the steam turbine is completed according to the following steps:

[0018] 1. Taking the pre-deformation amount of the outer ring 1 of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring 1 of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring 1 of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring of the outer ring 1 of the outer ring of the outer ring of the outer ring of the outer ring o...

specific Embodiment approach 2

[0025] Embodiment 2: This embodiment differs from Embodiment 1 in that: before the heat treatment in step 1, the asbestos mud is firstly blocked the hydrophobic holes of the outer ring 1 of the partition.

[0026] Other steps are the same as in the first embodiment.

[0027] The purpose of blocking the hydrophobic holes of the outer ring 1 of the partition is to prevent the oxidation of the walls of the hydrophobic holes of the outer ring 1 of the partition to form an oxide layer during the heat treatment process, which is difficult to clean.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the heat treatment in step 1 is to heat the outer ring 1 of the partition to 610°C-630°C and keep it warm for 4h-6h.

[0029] The heat treatment of the outer ring 1 of the separator is to eliminate the occurrence of opening the middle surface 4 of the outer ring 1 of the separator according to the reference size in the opposite direction of the inward closing of the outer ring 1 of the separator when the outer ring 1 of the separator is welded. The stress of the outer ring 1 of the partition is prevented from being deformed after the tie bars are removed. The specific process parameters of the heat treatment need to be adjusted according to the material and thickness of the outer ring 1 of the partition.

[0030] Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for eliminating deformation of a split closing port of a low-pressure hollow partition outer ring of a steam turbine, relates to the technical field of hot processing of the steam turbine, and aims to solve the problem of inward deformation produced by an outer ring split closing port during welding of a low-pressure hollow partition of a conventional steam turbinesteam turbine unit. The method comprises steps as follows: step one, predeformation amount of the partition outer ring during conventional welding of the low-pressure hollow partition is taken as reference dimension, the split is propped open according to the reference dimension in the direction opposite to the inward closing port produced by the split during welding, tie pieces are welded on thepartition outer ring along the split, and the tie pieces are removed after the partition outer ring is subjected to heat treatment; step two, the partition outer ring is propped back according to thereference dimension in the direction of the inward closing port produced by the split during welding, and the tie pieces are welded on the partition outer ring along the split; and step three, the partition outer ring, a hollow guide vane and a partition inner ring are assembled and welded, the tie pieces are removed, and stress of the partition is removed. The method is suitable for eliminating deformation produced by the split closing port during welding of the low-pressure hollow partition outer ring of the steam turbine.

Description

technical field [0001] The invention relates to the technical field of thermal processing of steam turbines. Background technique [0002] The low-pressure hollow diaphragm of a conventional steam turbine unit is composed of a hollow diaphragm outer ring with a hydrophobic chamber, a diaphragm inner ring and a hollow guide vane. After assembly, it is welded by argon arc welding. The part that connects with the hollow guide vane, and the hollow guide vane and the inner ring of the clapboard. Due to the large size of the low-pressure diaphragm, the amount of welding produced is also large, and the rigidity of the hollow structure of the outer ring of the diaphragm is relatively poor. Road pitch circle, and lead to the phenomenon of radial misalignment when the separator is welded and half-closed, and the quality is unstable. [0003] Therefore, how to solve the problem of inward deformation of the facet closure of the outer ring during welding of the low-pressure hollow diap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/00
Inventor 张辰鸾王广成邹艳哲苏志成杨飞鹏王冬雪张志松康禹孔令福
Owner HARBIN TURBINE