CN104515808A - Steam-turbine generator retaining ring ultrasonic imaging testing method - Google Patents
Steam-turbine generator retaining ring ultrasonic imaging testing method Download PDFInfo
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- CN104515808A CN104515808A CN201410711475.1A CN201410711475A CN104515808A CN 104515808 A CN104515808 A CN 104515808A CN 201410711475 A CN201410711475 A CN 201410711475A CN 104515808 A CN104515808 A CN 104515808A
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Abstract
The invention discloses a steam-turbine generator retaining ring ultrasonic imaging testing method which comprises the following steps: A, an ultrasonic phased array testing instrument and an ultrasonic phased array transducer are connected; B, the outer surface of a steam-turbine generator retaining ring is brushed and coated with a coupling agent; C, the ultrasonic phased array transducer is arranged on the outer surface of the steam-turbine generator retaining ring for scanning, and is located by an inherent echo; D, collected reflected acoustic signals are converted into electrical signals by the ultrasonic phased array transducer, and are stored and imaged by the ultrasonic phased array testing instrument, a steam-turbine generator retaining ring workpiece contour diagram is taken, workpiece contour diagram corresponding positions are corresponding to reflected wave positions, the ultrasonic phased array transducer transmits the inherent echo with lowest amplitude, the inherent echo is increased by 10 db to use as detection sensitivity, and the defect information can be interpreted through a generated image; and E, quality of the steam-turbine generator retaining ring is assessed and recorded. The steam-turbine generator retaining ring ultrasonic imaging testing method has the advantages of capability of convenient and quick nondestructive detection of internal defects of the steam-turbine generator retaining ring, and accurateness and effectiveness.
Description
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)
1. a turbine generator guard ring ultrasonic imaging detection method, is characterized in that, 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.
2. turbine blade bacterial type root ultrasonic imaging detection method according to claim 1, it is characterized in that, 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410711475.1A CN104515808A (en) | 2014-12-01 | 2014-12-01 | Steam-turbine generator retaining ring ultrasonic imaging testing method |
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| CN201410711475.1A CN104515808A (en) | 2014-12-01 | 2014-12-01 | Steam-turbine generator retaining ring ultrasonic imaging testing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675721A (en) * | 2016-01-29 | 2016-06-15 | 上海应用技术学院 | Ultrasonic imaging testing device and system |
| CN108802182A (en) * | 2018-06-14 | 2018-11-13 | 国网宁夏电力有限公司电力科学研究院 | The generator guard ring detection method of inner surface wave is encouraged based on graze |
| CN109668959A (en) * | 2019-02-28 | 2019-04-23 | 国电科学技术研究院有限公司 | Retaining ring ultrasonic phase array automatic detection device and automatic testing method |
| CN112461924A (en) * | 2020-11-10 | 2021-03-09 | 西安热工研究院有限公司 | Generator guard ring detection method based on phased array ultrasonic longitudinal wave |
| CN112461923A (en) * | 2020-11-10 | 2021-03-09 | 西安热工研究院有限公司 | Generator guard ring detection method based on phased array ultrasonic transverse wave |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018334A (en) * | 2013-01-09 | 2013-04-03 | 河南省电力公司电力科学研究院 | Ultrasonic imaging detecting method of mushroom type root part of blades of steam turbine and phased array energy transduction device |
-
2014
- 2014-12-01 CN CN201410711475.1A patent/CN104515808A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018334A (en) * | 2013-01-09 | 2013-04-03 | 河南省电力公司电力科学研究院 | Ultrasonic imaging detecting method of mushroom type root part of blades of steam turbine and phased array energy transduction device |
Non-Patent Citations (1)
| Title |
|---|
| 中华人民共和国国家发展和改革委员会: "《中华人民共和国机械行业标准JB/T4010-2006》", 27 November 2006 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675721A (en) * | 2016-01-29 | 2016-06-15 | 上海应用技术学院 | Ultrasonic imaging testing device and system |
| CN108802182A (en) * | 2018-06-14 | 2018-11-13 | 国网宁夏电力有限公司电力科学研究院 | The generator guard ring detection method of inner surface wave is encouraged based on graze |
| CN109668959A (en) * | 2019-02-28 | 2019-04-23 | 国电科学技术研究院有限公司 | Retaining ring ultrasonic phase array automatic detection device and automatic testing method |
| CN112461924A (en) * | 2020-11-10 | 2021-03-09 | 西安热工研究院有限公司 | Generator guard ring detection method based on phased array ultrasonic longitudinal wave |
| CN112461923A (en) * | 2020-11-10 | 2021-03-09 | 西安热工研究院有限公司 | Generator guard ring detection method based on phased array ultrasonic transverse wave |
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Application publication date: 20150415 |