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

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...

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

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