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

A technology for ultrasonic imaging detection and steam turbine blades, which is applied to measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, and using sound waves/ultrasonic waves/infrasonic waves for material analysis. problem, to achieve the effects of intuitive imaging, improved signal-to-noise ratio and sensitivity, and good acoustic beam accessibility

Inactive Publication Date: 2014-04-02
STATE GRID CORP OF CHINA +1
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  • Abstract
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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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  • Ultrasonic imaging detection phased array transduction device for blade fir-type root of turbine
  • Ultrasonic imaging detection phased array transduction device for blade fir-type root of turbine
  • Ultrasonic imaging detection phased array transduction device for blade fir-type root of turbine

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Embodiment Construction

[0016] Such as figure 1 , figure 2 As shown, the phased array transducer of the present invention includes a phased array transducer 7 and a wedge 8 . The center frequency of the phased array transducer 7 is 5MHz-9MHz, the number of array elements is 16-32, the array element spacing is 0.5mm-1mm, the array element width is 4mm-10mm, and the array elements adopt strip piezoelectric Ceramic chip array elements, multiple strip-shaped piezoelectric ceramic chip array elements are arranged in parallel and embedded in the matrix of the phased array transducer 7, and the incident angle ranges from 30° to 70°, so as to ensure the first 1. Full coverage inspection of the inner and outer arcs of the second dedendum; the longitudinal section of the wedge 8 is a pentagon, and the pentagon includes successively connected top edges, hypotenuses, right edges, bottom edges, and left edges. The side and bottom are set horizontally, the left side and right side are set vertically, and the hy...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/22G01N29/06
Inventor 汪毅牛保献李亚飞刘文生贾少威江野李世铭张武能
Owner STATE GRID CORP OF CHINA
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