Method for improving rapid cold repair strength of abrasion damage of flow passage component of water turbine

A technology of flow-passing parts and water turbines, which is applied in the direction of hydropower generation, can solve the problems of low safety risk and short construction period, and achieve the effect of stable process, short construction period and good repeatability

Active Publication Date: 2020-10-30
云南联合电力开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome that the existing welding repair cannot meet the technical requirements of short construction period, no deformation, and safety and reliability in the minor repair process of the water turbine in the high-sediment basin, the present invention provides a method for improving the strength of rapid cold repair of the abrasion damage of the flow-through parts of the water turbine, which has the advantages of simple process , short construction period, low safety risk, high bonding strength after repair, etc.

Method used

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  • Method for improving rapid cold repair strength of abrasion damage of flow passage component of water turbine
  • Method for improving rapid cold repair strength of abrasion damage of flow passage component of water turbine

Examples

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Embodiment 1

[0027] Example 1: During the minor maintenance of a hydropower plant with high water head and high sediment content, it was found that the vicinity of the guide vane hole of the turbine top cover was severely eroded by sediment, with a depth of 5-10mm, and the size of the abrasive area was 120mm×60mm. The flow cannot be controlled normally, which affects the efficiency of the unit. The method of the present invention is used for repairing. First, the abrasive area around the hole is polished to form a smooth transition at the bottom. The deepest 10mm pit to be repaired is then planted by energy storage welding with a 1mm metal wire. The planting density 2~3 roots / cm 2 . Cut the metal wire higher than the original plane to complete the planting of the wire. Then use 500g of epoxy resin, 25g of φ10μm×300μm carbon fiber and 600g of 100 mesh tungsten carbide powder to mix evenly, and add a certain curing agent to form a viscous filling body. Pour the prepared viscous filling in...

Embodiment 2

[0028] Example 2 Cavitation damage often occurs in the bucket part of an impact turbine, and the main damage area is located on both sides of the water divider. Grind the area until there are no cavitation defects, and smooth the surrounding area, and then use 0.5mm metal wires to plant by energy storage welding, with a planting density of 2 to 3 roots / cm 2 . Cut the metal wire higher than the original plane to complete the planting of the wire. Then use 1000g of epoxy resin, 50g of φ10μm×500μm carbon fiber and 1000g of spherical titanium carbide powder to mix evenly, and add a certain curing agent to form a viscous filling body. Pour the prepared viscous filling into the pit where the metal wire was planted, and after 4 hours of solidification, use a pneumatic grinder to polish to restore the molded line.

Embodiment 3

[0029] Example 3: The martensitic stainless steel anti-leakage ring of a hydropower plant was severely worn, and abrasive grooves with a depth of 2 to 5 mm and a width of 30 mm were formed on the sides of each comb tooth ring, which could no longer play the function of the anti-leakage ring and affected Crew efficiency and safety. The method of the present invention is used for repairing. Firstly, the surrounding area of ​​the abrasive groove is cleaned to form and remove stains, and then 0.5mm metal wires are used to plant by means of energy storage welding, and the planting density is 2 roots / cm 2 . Cut the metal wire higher than the original plane to complete the planting of the wire. To enhance the bonding strength of the repair, 3000g of epoxy resin, 300g of φ10μm×300μm carbon fiber and 2500g of alumina ceramic powder are uniformly mixed, and a certain curing agent is added to form a viscous filler. Pour the viscous filling body into the abrasive pit after sandblasting,...

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Abstract

The invention provides a method for improving the rapid cold repair strength of abrasion damage of a flow passage component of a water turbine. According to the method, a metal fiber or metal wire texture framework is adopted firstly, then a viscous filling body is adopted for filling, a high-strength repair layer is formed after curing, and the method comprises the following specific steps that (1) polishing is carried out on cavitation and abrasion areas, and pits in smooth transition are formed; (2) metal fibers or metal wires are adopted and planted in the pits to be repaired in an energystorage welding mode to serve as a framework of the viscous filling body; (3) an epoxy resin, ceramic particles and fibers are mixed and a curing agent is added to form the viscous filling body; (4) the viscous filling body is poured into the pits, and the pits are filled with the viscous filling body by taking the metal wires as the framework; and (5) after the viscous filling body is cured, a polishing machine is adopted for polishing and flattening. The method for improving the rapid cold repair strength of abrasion damage of the flow passage component of the water turbine has the characteristics of simple process, high bonding strength of the repairing layer, difficulty in deformation of a workpiece, short construction period and low safety risk.

Description

technical field [0001] The invention relates to the technical field of abrasion damage of flow-passing parts of a water turbine and repair of electric equipment, in particular to a method for improving the strength of fast cold repair of abrasion damage of flow-flow parts of a water turbine. Background technique [0002] The flow-through components of hydropower stations in sediment-rich basins, such as guide vanes, top covers, bottom rings, paddles, runners, etc., are prone to abrasive damage such as cavitation and abrasion in sandy water flow environments. In addition, when the content of solid particles such as feldspar, quartz and other high-hardness mineral particles in the fluid is higher, the damage speed of the flow-passing parts is faster and the degree of abrasion is more serious, which reduces the service life of the parts and causes System safety failures increase repair and maintenance costs. [0003] At present, in the field of electricity and machinery, for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
CPCB23P6/007Y02E10/20
Inventor 罗有德王文彬杨凤鸣熊智蒋三林郭鸿鹅吴仕虎王记
Owner 云南联合电力开发有限公司
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