Unlock instant, AI-driven research and patent intelligence for your innovation.

Repair technology of bearing bush of steam turbine of thermal power plant

A technology for steam turbines and thermal power plants, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, optical testing of flaws/defects, etc., and can solve problems such as incompatibility

Inactive Publication Date: 2015-03-04
华能兰州西固热电有限公司
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steam turbine bearing bushes are traditionally used to test the fusion of black gold composite layer by penetration. This test method can only be judged by the experience of beating and listening to the non-open internal bodiless, and it is increasingly unsuitable for my country's high-power, high-parameter Requirements for bearing bush inspection in power station

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Repair technology of bearing bush of steam turbine of thermal power plant
  • Repair technology of bearing bush of steam turbine of thermal power plant
  • Repair technology of bearing bush of steam turbine of thermal power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Repair welding process: 1. Clean up the tile tire

[0032] (1) Determine the bodiless part, and then completely remove the bodiless part.

[0033] (2) Clean the concave surface of the bearing bush with a wire brush to reveal the metallic luster.

[0034] (3) Wash 3 times with 10% sodium hydroxide or potassium hydroxide, and then wash with water.

[0035] (4) Use bottled oxygen and acetylene supplied by the manufacturer for on-site use. When heating, burn the tile surface with an oxyacetylene flame to remove graphite and oil stains remaining in the pores, and lightly wipe the surface with a white cloth.

[0036] 2 hanging tin

[0037] The purpose of tinning is to increase the adhesion of the bearing alloy to the tile tire so that it can be tightly combined. Tin-lead alloy solder with good process performance is usually used as the tin-hanging material.

[0038] (1) Process tin into strips of 4mm.

[0039] (2) Apply a layer of hydrochloric acid on the surface of t...

Embodiment 2

[0078] 1. Repair welding process: 1. Clean up the tile tire

[0079] (3) Wash 4 times with 10% sodium hydroxide or potassium hydroxide.

[0080] 2 hanging tin

[0081] (1) The purpose of tinning is to increase the adhesion of the bearing alloy to the tile tire so that it can be tightly combined. Tin-lead alloy solder with good process performance is usually used as the tin-hanging material. Process the tin into 6mm strips.

[0082] (7) After tinning, repair the black gold in time within 2 minutes, and do not leave it for too long to avoid oxidation.

[0083] 3 Ugin preparation for repair welding bearing

[0084] (2) Before repair welding, use an angle iron as a mold to melt Wujin into a Ф6mm strip.

[0085] 4 Repair welding of bearing alloy

[0086] (3) In order to prevent the deformation of the tile body, multi-layer and multi-pass repair welding should be used. During surfacing welding, the thickness shall not exceed the diameter of the Wujin rod each time, and the wi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a repair technology of a bearing bush of a steam turbine of a thermal power plant. The repair technology concretely comprises the steps of firstly, determining a bodiless part, thoroughly removing the bodiless part, and cleaning a tile base; laying a tin film, hanging tin, carrying out surfacing welding preparation, carrying out surfacing, and feeding black ebony for repair welding; carrying out post-weld treatment in a scraping way, and carrying out nondestructive testing by combining penetrate testing and ultrasonic testing to complete the repair technology. The traditional repair technology adopts an integral casting way, but needs special equipment, thus being higher in cost and longer in time limit for a project; the technology adopting local repair welding is simple, low in cost, short in time limit for the project and less in work load, and can be directly implemented in site; according to the bearing bush of the steam turbine, the fusion condition of a black ebony compound layer is traditionally tested by penetration, and the non-opening internal bodilessness is only judged by the experience of beating and listening to the sound, so that the examination requirements of a high power and high parameter power station for the bearing bush in China are not met; therefore, the bearing bush is comprehensively tested by two ways of penetrate testing and ultrasonic testing, so that the detection sensitivity and the defect finding ability are improved.

Description

technical field [0001] The invention relates to a repairing process for a bearing bush, in particular to a repairing process for a steam turbine bearing bush in a thermal power plant. Background technique [0002] The steam turbine bearing alloy is Babbitt alloy, and Babbitt alloy is divided into two types according to its chemical composition, namely tin-based bearing alloy and lead-based bearing alloy. Tin-based bearing alloy is an alloy composed of Sn-based, adding a small amount of Sb and Cu. The typical grade is: ZChSnSb11-6, which is often used for pouring bearing bushes with heavy load, high speed and high corrosion resistance requirements, such as steam turbines and generators. Bearing bush; lead-based bearing alloy is an alloy composed of Sn, Sb, Cu, etc. based on Pb. The typical grade is ZChPbSb16-16-2, which is often used to manufacture bearings for low and medium loads and low and medium speed equipment, such as pumps, Bearing linings for fans, coal mills and el...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00B23P6/04G01N21/91
CPCB23P6/00G01N21/91G01N29/04
Inventor 王沛
Owner 华能兰州西固热电有限公司