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Steam-turbine generator retaining ring ultrasonic imaging testing method
CN104515808A
China
- Other languages
Chinese - Inventor
靳峰 李世涛 汪毅 蔡红生 吴克华 - Current Assignee
- State Grid Corp of China SGCC
- Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
- Henan Enpai High Tech Group Co Ltd
Worldwide applications
2014
CN
Application CN201410711475.1A events
2014-12-01
2015-04-15
Status
Pending
Description
translated from
Technical field
The present invention relates to a kind of turbine generator guard ring detection method, particularly relate to a kind of turbine generator guard ring ultrasonic imaging detection method.
Background technology
Turbodynamo is widely used in electric power enterprise, at present, when detecting turbine generator guard ring, and main adopt or A type pulse-echo contact ultrasonic detection method.Because the material Acoustic Wave Propagation performance of turbine generator guard ring is special, complex-shaped, be often easily subject to the impact of the factors such as intrinsic echo when carrying out A type pulse-echo contact ultrasonic and detecting, thus cause the erroneous judgement of defect or undetected.On the other hand, because turbine generator guard ring assembling adopts interference fit, axle tooth has symmetric impression on the inside surface of setting-in position, easily forms reflection, cause erroneous judgement when therefore utilizing traditional A type pulse-echo contact ultrasonic to detect.Along with the increase of power station unit capacity, the pattern of turbine generator guard ring also gets more and more, existing detection means, because detection method is complicated, detection efficiency is low, region of lapsing is large and high to testing staff's competency profiling, cannot meet various dissimilar turbine generator guard ring testing requirement.
Summary of the invention
The object of this invention is to provide a kind of turbine generator guard ring ultrasonic imaging detection method, can to turbine generator guard ring inside, whether existing defects carry out Non-Destructive Testing quickly and easily, there is the advantage of efficiently and accurately.
The present invention adopts following technical proposals:
A kind of turbine generator guard ring ultrasonic imaging detection method, comprises the following steps successively:
A: select the ultrasonic phase array detector with imaging function to be connected with ultrasonic phased array transducer, the operating frequency range of described ultrasonic phase array detector is 1MHz-10MHz, and horizontal linearity error is not more than 2%, and vertical linearity error is not more than 8%; The centre frequency of described ultrasonic phased array transducer is 1MHz-2MHz, array element gap is 0.1mm-0.2mm, array number is 16-32, the array element be made up of rectangular piezoelectric ceramic wafer is being parallel to transducer matrix width direction layout in linear form, be embedded in ultrasonic phased array transducer matrix, deflection angle ranges is 10 °-80 °;
B: brush couplant at turbine generator guard ring outside surface;
C: ultrasonic phased array transducer is arranged on retaining ring outside surface and carries out scanning, positioned by intrinsic echo;
D: utilize ultrasonic phased array transducer to convert the reflected sonic signals collected to electric signal, send into ultrasonic phase array detector by data cable and preserve imaging, transfer turbine generator guard ring workpiece profile figure, regulate workpiece dimension of picture, make workpiece figure relevant position corresponding with reflection wave position, namely reflection wave can be considered actual reflection, launch the minimum intrinsic echo of wave amplitude with ultrasonic phased array transducer again and improve 10dB for detection sensitivity, by the image interpretation defect information finally produced;
E: grade estimation is carried out and record to turbine generator guard ring.
Described step C is further comprising the steps of:
C1: ultrasonic phased array transducer is arranged on turbine generator guard ring locking end and carries out scanning, with the intrinsic echo of step below turbine generator guard ring locking end for feature echo positions;
C2: ultrasonic phased array transducer is arranged on turbine generator guard ring screens end and carries out scanning, with the intrinsic echo of step below turbine generator guard ring screens end for feature echo positions;
C3: ultrasonic phased array transducer is arranged on turbine generator guard ring turbine generator guard ring workplace and carries out scanning back and forth, with the upper surface interface echo of turbine generator guard ring workplace for feature echo positions.
The present invention utilizes ultrasonic phased array transducer to carry out scanning at retaining ring outside surface, convert the reflected sonic signals collected to electric signal and preserve imaging by ultrasonic phase array detector, by comparing with turbine generator guard ring workpiece profile figure, launch the minimum intrinsic echo of wave amplitude with ultrasonic phased array transducer and improve 10dB for detection sensitivity, by the image interpretation defect information finally produced, the detecting step that the present invention can overcome existing for existing conventional method is complicated, detection efficiency is low, region of lapsing is large, the defect too high to personnel qualifications, what realize generator guard ring inside whether existing defects is simple, fast, reliable Non-Destructive Testing, while detecting fast, also there is the advantage being convenient to distinguish intrinsic echo and flaw echo.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the profile diagram of turbine generator guard ring in the present invention.
Embodiment
As shown in Figure 1, turbine generator guard ring ultrasonic imaging detection method of the present invention, comprises the following steps successively:
A: select the ultrasonic phase array detector with imaging function to be connected with ultrasonic phased array transducer, the operating frequency range of described ultrasonic phase array detector is 1MHz-10MHz, and horizontal linearity error is not more than 2%, and vertical linearity error is not more than 8%; The centre frequency of described ultrasonic phased array transducer is 1MHz-2MHz, array element gap is 0.1mm-0.2mm, array number is 16-32, the array element be made up of rectangular piezoelectric ceramic wafer is being parallel to transducer matrix width direction layout in linear form, be embedded in ultrasonic phased array transducer matrix, deflection angle ranges is 10 °-80 °;
B: brush couplant at turbine generator guard ring outside surface;
C: ultrasonic phased array transducer is arranged on retaining ring outside surface and carries out scanning, positioned by intrinsic echo;
When specifically performing, carry out according to following steps:
C1: ultrasonic phased array transducer is arranged on turbine generator guard ring locking end (in figure A place) and carries out scanning, with the intrinsic echo of step below turbine generator guard ring locking end for feature echo positions;
C2: ultrasonic phased array transducer is arranged on turbine generator guard ring screens end (in figure B place) and carries out scanning, with the intrinsic echo of step below turbine generator guard ring screens end for feature echo positions;
C3: ultrasonic phased array transducer is arranged on turbine generator guard ring workplace (comprising turbine generator guard ring locking end and turbine generator guard ring screens end) and carries out scanning back and forth, with the upper surface interface echo of turbine generator guard ring workplace for feature echo positions;
D: utilize ultrasonic phased array transducer to convert the reflected sonic signals collected to electric signal, send into ultrasonic phase array detector by data cable and preserve imaging, transfer turbine generator guard ring workpiece profile figure, regulate workpiece dimension of picture, make workpiece figure relevant position corresponding with reflection wave position, namely reflection wave can be considered actual reflection, launch the minimum intrinsic echo of wave amplitude with ultrasonic phased array transducer again and improve 10dB for detection sensitivity, by the image interpretation defect information finally produced;
E: grade estimation is carried out and record to turbine generator guard ring.
The centre frequency of the ultrasonic phased array transducer that the present invention selects is 1MHz-2MHz, array element gap is 0.1mm-0.2mm, array number is 16-32, the array element be made up of rectangular piezoelectric ceramic wafer is being parallel to transducer matrix width direction layout in linear form, be embedded in ultrasonic phased array transducer matrix, deflection angle ranges is 10 °-80 °, the energy attenuation that sound wave is less in retaining ring can be ensured, its higher detection sensitivity can be ensured again, larger deflection angle ranges, ensure that all standing inspection at angle, opposite end, middle single scanning scope also can be made to maximize.
In actual testing, the physical size of retaining ring is the unknown, and retaining ring material is different, the velocity of sound also has difference, and step C and step D utilizes natural waves to locate, and transfers turbine generator guard ring workpiece profile figure, regulate workpiece dimension of picture, make workpiece figure relevant position corresponding with reflection wave position, effectively evaded the problems referred to above, make the differentiation of intrinsic echo and defect waves be very easy to simultaneously.
Claims (2)
Hide Dependent
translated from Chinese
Claims (2)
Hide Dependent
translated from Chinese