High temperature alloy spring for steam turbine steam locking and its processing method and detecting installation

Abstract

The column type helical spring is made from Inconal X-750 (GH4145) alloy wire. The procedures for manufacturing the spring are as following: wrapping the semi-finished product of long coil of spring:cutting the long coil to single springs; washing the springs; carrying out the solid solution heat treatment; cutting end and adjusting the pitch, and carrying out the aging heat treatment. With the tests of rigidity and permangnet deformation in high temperature being completed, the finished springs are obtained. The device for testing rigidity of the spring includes the worktable, the electric stove and dial gauge etc. Testing indicates the performances of the spring: when the working temperature at 550 degree.C, the service life > or =25000 hr. The spring is easy to be assembled in the vapor lock.

Description

technical field [0001] The invention relates to a spring. Specifically, the present invention relates to a superalloy spring used for the steam seal of a steam turbine, its processing method and inspection device. Background technique [0002] As far as the applicant knows: for various types of steam turbines in my country, the steam seal springs of diaphragm seals, shaft seals and other parts in the high temperature section (the maximum working temperature is about 540°C) generally use spring sheets made of GH2132 material. The service life of the sheet is short, and the average use time is no more than 5000-10000 hours, that is, it loses its elasticity, resulting in a decrease in the thermal efficiency of the unit, thus becoming a weak link that affects the overall quality of the unit. Internationally, on the subcritical 600MW steam turbine of Hitachi, Japan, the steam seal spring is made of InconelX-750 (GH4145) superalloy material, but the structure of the spring is stil...

AI Technical Summary

Problems solved by technology

[0002] As far as the applicant knows: for various types of steam turbines in my country, the steam seal springs of diaphragm seals, shaft seals and other parts in the high temperature section (the maximum working temperature is about 540°C) generally use spring sheets made of GH2132 material. The service life of the sheet is short, and the average use time is not more than 5000-10000 hours, that is, it loses its elasticity, resulting in a decrease in the thermal efficiency of the unit, thus becoming a weak link that affects the overall quality of the unit

Internationally, on the subcritical 600MW steam turbine of Hitachi, Japan, the steam seal spring is made of InconelX-750 (GH4145) superalloy material, but the structure of the spring is still a sheet structure, and there are difficulties in the assembly of the steam seal, as well as the deformation of the steam seal during use. Difficulty and other issues

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