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Ultrasonic imaging detecting method of mushroom type root part of blades of steam turbine and phased array energy transduction device

An ultrasonic imaging detection and steam turbine blade technology, which is used in measurement devices, solids analysis using sonic/ultrasonic/infrasonic waves, and material analysis using sonic/ultrasonic/infrasonic waves. To solve problems such as detection, to achieve the effects of improved signal-to-noise ratio and sensitivity, good beam accessibility, and intuitive imaging

Active Publication Date: 2015-06-10
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the fungus-shaped root of the leaf is complex, and there are many places where the stress concentrates, and most of the defects exist in the fungus-shaped tooth arc surface
In the current existing technology, conventional ultrasonic testing is mostly used for the detection of leaf fungal roots. Conventional ultrasonic testing mainly uses the primary pulse reflection method of longitudinal waves and transverse waves, which can only detect the position of the first tooth arc surface of leaf fungal roots, and the rest Almost all are out of check
In addition, there are many interference factors in the detection process, and the requirements for the detection personnel are very high, and the detection accuracy is not good

Method used

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  • Ultrasonic imaging detecting method of mushroom type root part of blades of steam turbine and phased array energy transduction device
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  • Ultrasonic imaging detecting method of mushroom type root part of blades of steam turbine and phased array energy transduction device

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Embodiment Construction

[0028] The steam turbine blade fungal root 3 ultrasonic imaging detection method of the present invention comprises the following steps:

[0029] The first step: choose a phased array detector with imaging function to connect with the phased array transducer 1, the working frequency range of the phased array detector is 1MHz-10MHz, the horizontal linearity error is not more than 2%, and the vertical linearity The error is not greater than 8%; the phased array transducer 1 is inverted T-shaped, with a length of 28mm, a width of 15mm, and a height of 24mm. The center frequency of the phased array transducer 1 is 5MHz-10MHz, and the number of array elements is 16. -32 pieces, the array element spacing is 0.5mm-1mm, the array element length is 8mm-10mm, the array elements composed of rectangular piezoelectric ceramic wafers are arranged in a linear form parallel to the width of the transducer base, embedded in the phased array In the matrix of the transducer 1, the deflection angl...

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Abstract

The invention discloses an ultrasonic imaging detecting method of a mushroom type root part of blades of a steam turbine and a phased array energy transduction device. According to the invention, the ultrasonic phased array detecting method and the energy transduction device which are adopted are good in acoustic beam accessibility; ultrasonic emitting acoustic beams can be changed through wedge blocks, thus the acoustic beams can enter the mushroom type root part of the blades to cover all key detecting parts so as to compressively image and inspect a component with a complex geometric shape; the focus dimension, the depth of a focusing area and the directions of the acoustic beams can be optimally controlled under the condition that a probe is not moved or is moved slightly; and the detection speed, the scope, the resolution ratio, the signal-to-noise ratio and the sensitivity can be improved; and furthermore, the imaging is clear, and the reflection echo of a defect can be quickly and accurately positioned.

Description

technical field [0001] The invention relates to an ultrasonic imaging detection method and a phased array transducer, in particular to an ultrasonic imaging detection method and a phased array transducer for steam turbine blade fungus roots. Background technique [0002] At present, steam turbine rotor blades, as important supervised metal parts, not only bear huge alternating stress and torque, but also bear the impact of high-temperature and high-speed gas. Ensure that the blades can be firmly fixed on the impeller under any operating conditions, and the fungal roots of the blades are buried inside the impeller. If there are defects in the fungal roots of the leaves and cannot be found in time, the leaves will fly off during the rotation process, causing serious production accidents. Therefore, preventive inspection of the fungal roots of leaves is an important means to eliminate hidden dangers of equipment and ensure the safe operation of the unit. [0003] The fungal r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/06G01N29/22
Inventor 杨旭汪毅李世涛
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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