Ultrasonic imaging detection phased array transduction device for blade fir-type root of turbine

Abstract

The invention discloses an ultrasonic imaging detection phased array transduction device for a blade fir-type root of a turbine. The ultrasonic imaging detection phased array transduction device comprises a phased array transducer and a wedge block, wherein the number of array elements of the phased array transducer is 16 to 32; the interval of the array elements is 0.5 to 1mm; the width of each array element is 4 to 10mm; a plurality of strip-shaped piezoelectric ceramic wafer array elements are arranged in parallel and are embedded into a base body of the phased array transducer, and an angle of incidence is 30 to 70 degrees; a phased array transducer slot is formed in the inclined surface of the wedge block; an included angle between the bottom surface of the phased array transducer slot and the bottom surface of the wedge block is 31 to 41 degrees; impedance rubber is arranged in the wedge block along the direction of an acoustic beam. The ultrasonic imaging detection phased array transduction device is high in acoustic beam accessibility; an ultrasonic emission acoustic beam is changed by using the wedge block, so that the acoustic beam can enter the blade fir-type root, can cover all key detection parts, and can perform comprehensive imaging inspection on a complicated turbine blade fir-type root.

Description

technical field [0001] The invention relates to a phased array transducer for ultrasonic imaging detection, in particular to a phased array transducer for ultrasonic imaging detection of fir tree-shaped roots of steam turbine blades. Background technique [0002] At present, as an important supervised metal part, the rotor blade of a steam turbine not only bears huge alternating stress and torque, but also bears the impact of high-temperature and high-speed gas. The fir tree root of the blade is the part connecting the blade and the rim. In order to ensure that the blades can be firmly fixed on the impeller under any operating conditions, the fir tree-shaped roots of the blades are buried inside the impeller. If there are defects in the fir tree-shaped root of the blade and cannot be found in time, the blade will fly off during the rotation process, causing serious production accidents. Therefore, preventive inspection of the fir-tree root of the blade is an important means...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a phased array transduction device for ultrasonic imaging detection of the fir tree root of a steam turbine blade, which has good sound beam accessibility, and can comprehensively, accurately, quickly and intuitively detect the fir tree root of a blade with complex geometric shapes. Ground imaging inspection to solve the problems of small detection range and large missed detection area of ​​existing detection methods

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