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Mixed flow type hydroturbine weight-bearing bracket fatigue life test and analysis method

A technology of fatigue life and test analysis, which is applied in the direction of analyzing materials, using applied repetitive force/pulsation force to test material strength, measuring devices, etc., to achieve the effect of improving accuracy

Active Publication Date: 2017-07-28
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are many patents and papers on the fatigue life analysis of conventional thermal power generation unit components, but very few methods for fatigue life analysis of important components of hydraulic power generation units

Method used

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  • Mixed flow type hydroturbine weight-bearing bracket fatigue life test and analysis method

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Embodiment Construction

[0025] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0026] see figure 1 , a method for testing and analyzing the fatigue life of a bearing bracket of a Francis turbine in the present embodiment, comprising the following steps:

[0027] 1. The main load-bearing support is determined according to the structure of the Francis turbine unit. The lower frame is selected for the umbrella-type unit, and the upper frame is for the suspension unit. In order to ensure a large strain at the measuring point; arrange the measuring point on each load-bearing support leg or on the web of the interval support leg, the measuring point is arranged on the same plane as the thrust bearing, and at least 2 measuring points are arranged at the same position, Using the strain gauge electrical measurement method, paste the resistance strain gauge to the relevant measuring point...

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Abstract

The invention discloses a mixed flow type hydroturbine weight-bearing bracket fatigue life test and analysis method, which is characterized by comprising: determining a main weight-bearing bracket according to the structure form of a mixed flow type hydroturbine unit, measuring the strain at the surface of the weight-bearing bracket, ejecting the rotating part of the unit in a shutdown state, obtaining a strain value when the gravity of the rotating part of the unit is applied on the bracket, obtaining actual force applied on the bracket, carrying out strain measurement during a starting process, a load applying process, a load rejection process and a shutdown process, calculating the force applied on the weight-bearing bracket, counting the load-time processes of each working condition by using a cyclic counting method, counting the operating times of various working conditions, obtaining a bracket material S-N curve, and according to the working conditions, the load spectrum and the S-N curve, calculating the bracket fatigue life according to linear cumulative damage. According to the present invention, with the method, the actual force applied on the bracket can be rapidly and accurately measured, the fatigue life evaluation can be really and effectively performed on the weight-bearing bracket, and the weight-bearing bracket fatigue life analysis accuracy is improved.

Description

technical field [0001] The invention relates to hydroelectric power generation equipment technology, in particular to a method for testing and analyzing the fatigue life of a load-bearing support of a Francis hydroturbine. Background technique [0002] In a hydroelectric generator set, the load-bearing bracket of the unit bears the mass of all rotating parts of the unit and the axial water thrust, etc. The mass of the rotating part of the unit is usually more than 500 tons, and the axial water thrust can also be as high as thousands of tons. The design life of the unit is required to be in For more than 30 years, such a large load acts on the load-bearing support for a long time, and part of it is a cyclic load, which puts forward higher requirements on the fatigue life of the support. At present, Alstom, Toshiba Hydro, Voith Hydro, etc., internationally renowned designers and manufacturers of hydropower units, all use numerical analysis methods to conduct theoretical calcul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0073
Inventor 杨斌徐良玉邓亚新张帆曹波赖江波马俊顾承庆刘江崔健康王青华李冬冬姜朝晖
Owner STATE GRID CORP OF CHINA
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