CN112362730B - Device and method for detecting vortex of blade body and blade root rounding array of compressor blade - Google Patents
Device and method for detecting vortex of blade body and blade root rounding array of compressor blade Download PDFInfo
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- CN112362730B CN112362730B CN202011316470.0A CN202011316470A CN112362730B CN 112362730 B CN112362730 B CN 112362730B CN 202011316470 A CN202011316470 A CN 202011316470A CN 112362730 B CN112362730 B CN 112362730B
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- G—PHYSICS
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9006—Details, e.g. in the structure or functioning of sensors
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9093—Arrangements for supporting the sensor; Combinations of eddy-current sensors and auxiliary arrangements for marking or for rejecting
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
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Abstract
The invention discloses a device and a method for detecting vortex flow of a blade body and a blade root of a compressor blade in a rounded array. The main support comprises an upper support, a lower support, a rotating body and an external bolt; the support rod comprises a cylindrical rod, a nut, a spring and a rotation limiting hole; the sliding wheel comprises an upper rotating wheel, a lower rotating wheel, an upper wheel frame and a lower wheel frame; the probe comprises a flexible array eddy current probe, a liquid bag and a simulated body. The method comprises the following steps: (1) connecting the related components; (2) The height is adjusted to enable the profiling body to be tightly attached to the blade body and the blade root in a rounding way; (3) Accessing the probe into a host computer, starting scanning, and observing an impedance signal; and (4) during the temporary stop of the unit, the unit can be executed by an external control rod. The device and the method are simple and easy to operate, and can accurately, efficiently and reliably detect the blade body and blade root rounding crack defects of the gas turbine compressor blade during the unit temporary stop or overhaul period.
Description
Technical Field
The invention belongs to the technical field of eddy non-destructive testing, and particularly relates to a device and a method for detecting eddy currents of a blade body and a blade root rounding array of a compressor blade.
Background
The compressor blade is one of core components of the gas turbine, the compressor blade is subjected to complex cyclic stress in the service process, crack defects are easily generated at typical parts of the blade, the blade body and the blade root are rounded to be one of crack high-incidence areas, and after the blades are cracked in the areas, a plurality of compressor blades in China break suddenly in operation to cause serious faults of damage to the gas turbine. Therefore, the supervision and inspection of the quality and health of in-service compressor blades is one of the essential contents in the routine operation maintenance and various levels of overhaul of the gas turbine. At present, a fluorescence penetration method or an ultrasonic method is generally adopted for detecting the blade body of the compressor blade, the fluorescence penetration method has higher requirements on the surface cleanliness of the blade body, the detection interference factors are more, and only cracks with larger surface opening width can be detected. The ultrasonic method has the advantages of strong field adaptability, high accuracy of detection results, good repeatability and the like, is a preferable and reliable method for detecting the blade body of the air compressor, and is quite easy to cause missing detection or misjudgment of crack signals in the area due to the fact that the chamfer echo signals of the blade root platform are close to the crack echo signal sound path of the area when the blade body and the blade root rounding area are detected. The array vortex is a novel vortex detection technology, and the rapid and effective detection of the components is realized by the special design of the vortex detection coil structure and the powerful analysis, calculation and post-processing functions of the computerized vortex module. The main advantages are as follows: the detection coil is large in size, and the scanning coverage area is large; (2) The detection coil is formed by arranging a plurality of independent coils, and has consistent detection sensitivity for linear defects in different directions; (3) The probe appearance is custom designed according to the size and the molded surface of the detected part, so that good electromagnetic coupling can be directly formed with the detected part, and the interference of the lift-off effect is greatly reduced.
Therefore, the device and the method for detecting the blade body and blade root rounding array vortex of the compressor blade are developed, the defect that the echo of the chamfer of the platform is easily confused with the echo of the crack defect of the area when the area is detected by adopting an ultrasonic method at present is overcome, the defect of the rounding crack of the blade body and blade root of the compressor blade can be accurately detected during the temporary stop or overhaul of a unit, and the problem that the crack defect of the area is missed or misjudged is urgently needed to be solved at present is avoided.
Disclosure of Invention
Aiming at the limitation that the echo of the chamfer angle of the platform is easy to be confused with the echo of the crack defect in the area when the blade body and the blade root of the gas turbine compressor blade are rounded by adopting an ultrasonic method at present, and the crack defect in the area is missed to be detected or misjudged, the invention provides the device and the method for detecting the vortex of the blade body and the blade root of the gas turbine blade by adopting the rounded array of the blade body and the blade root of the gas turbine blade, which are simple and easy to operate, can accurately, efficiently and reliably detect the crack defect of the blade body and the blade root of the gas turbine blade during the temporary stop or overhaul of a unit, and provide technical support for safe and stable operation of the unit.
The invention is realized by adopting the following technical scheme:
the device for detecting the vortex of the blade body and the blade root of the compressor by using the rounded array comprises a main bracket, a supporting rod, a sliding wheel and a probe; the main support comprises an upper support, a lower support and a rotating body, the supporting rod comprises a cylindrical rod, a nut and a spring, and the supporting rod comprises an upper rotating wheel, a lower rotating wheel, an upper wheel frame and a lower wheel frame;
the upper support and the lower support are connected through the rotating body, the upper support is connected with the upper wheel frame, the lower support is connected with the lower wheel frame, one end of the cylindrical rod is connected with the probe, the other end of the cylindrical rod is sleeved with a spring and then penetrates through the rotating body, the spring is connected with the nut in a threaded manner, and the probe is provided with a simulated body.
The invention is further improved in that the rotating body comprises a rotating shaft and a rotating sleeve sleeved on the rotating shaft, and the upper bracket and the lower bracket are respectively connected with the rotating sleeve.
The invention is further improved in that the rotating sleeve and the rotating shaft are both provided with angle scales.
The invention is further improved in that each rotary sleeve is circumferentially provided with a rotary positioning bolt, at least one rotary sleeve is circumferentially provided with an external bolt, and the external bolt is of a cylindrical external thread structure and is used for externally connecting an operating rod.
The invention is further improved in that the rotating sleeve and the rotating shaft of the rotating body are positioned by bolts.
The invention is further improved in that the cylindrical rod penetrates through the rotating shaft round hole of the rotating body and is provided with a rotation limiting hole.
The invention is further improved in that the upper rotating wheel and the lower rotating wheel are both magnetic wheels, and the lower rotating wheel is of a universal wheel structure with universal joints.
The invention is further improved in that the upper rotating wheel is a double magnetic wheel, the lower rotating wheel is a single magnetic wheel, the heights of the rotating wheels can be adjusted by the upper wheel frame and the lower wheel frame, and the rotating wheels are positioned by positioning bolts.
The invention further improves that the probe also comprises a flexible array vortex probe and a liquid bag, the imitation body of the probe is in a shape of being in a round shape with a blade body and a blade root, the liquid bag interlayer is connected between the profiling body and the flexible array eddy current probe, the flexible array eddy current probe is a coil surface array eddy current probe, and the coil number is not less than 64.
The method is based on the device for detecting the vortex of the blade body and the blade root of the air compressor by the aid of the array, and comprises the following steps of:
the first step: the probe is arranged on a supporting rod, the supporting rod is arranged in a main support, an upper rotating wheel is magnetically connected with the blade body, and a lower rotating wheel is magnetically connected with the blade root platform;
and a second step of: the heights of the upper wheel frame and the lower wheel frame are adjusted according to the size of the detected blade, so that the profiling body of the probe is tightly attached to the blade body and the blade root rounding;
and a third step of: the probe is connected into the host computer of the array eddy current detector, the main bracket is manually pushed, the eddy current impedance signal characteristics of the host computer are synchronously observed while scanning is performed from the inlet to the outlet;
fourth step: if the detection is performed during the machine set temporary stop, a control rod can be externally connected, and the control rod can push the device to scan along the air inlet to the air outlet.
The invention has at least the following beneficial technical effects:
the invention provides a device and a method for detecting blade bodies and blade root rounding array vortex of a gas turbine, which are simple and easy to operate, can accurately, efficiently and reliably detect the blade body and blade root rounding crack defects of the gas turbine during the temporary stop or overhaul of a unit, avoid the limitation of missed detection or misjudgment of the crack defects of the area caused by the fact that a platform chamfering echo existing when an ultrasonic method is adopted to detect the area is easily confused with the crack defect echo of the area, and provide technical guarantee for safe and stable operation of the unit.
Drawings
Fig. 1 is a front view of a compressor blade body and blade root rounded array vortex detection apparatus according to the present invention.
Fig. 2 is a front view of a compressor blade body and blade root rounded array vortex detection apparatus according to the present invention.
Fig. 3 is a partial view of a probe in a compressor blade body and blade root rounded array vortex detection apparatus according to the present invention.
Reference numerals illustrate:
1. the device comprises a main bracket, 2, a supporting rod, 3, a sliding wheel, 4 and a probe;
101. the device comprises an upper bracket, 102, a lower bracket, 103, a rotating body, 104, an external bolt, 105, a rotating sleeve, 106, a rotating shaft, 107, an angle scale, 108 and a rotating positioning bolt; 201. the cylindrical rod, 202, the nut, 203, the spring, 204 and the rotation limiting hole; 301. the upper rotating wheel 302, the lower rotating wheel 303, an upper wheel frame 304, a lower wheel frame 305, positioning studs 306 and universal joints; 401. flexible array eddy current probe 402, liquid bag 403, imitative body.
Detailed Description
The present invention will be further described in detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Referring to fig. 1, 2 and 3, the invention provides a device for detecting vortex flow of a blade body and a blade root of a compressor blade in a rounded array, which comprises a main bracket 1, a supporting rod 2, a sliding wheel 3 and a probe 4.
The main bracket 1 comprises an upper bracket 101, a lower bracket 102, a rotating body 103 and an external bolt 104; the support rod 2 comprises a cylindrical rod 201, a nut 202, a spring 203 and a rotation limiting hole 204; the sliding wheel 3 comprises an upper rotating wheel 301, a lower rotating wheel 302, an upper wheel frame 303 and a lower wheel frame 304; the probe 4 includes a flexible array eddy current probe 401, a liquid bladder 402, and a contoured body 403. The upper bracket 101 and the lower bracket 102 are connected through the rotating body 103, the upper bracket 101 is connected with the upper wheel frame 303, the lower bracket 102 is connected with the lower wheel frame 304, the upper rotating wheel 301 and the lower rotating wheel 302 are magnetic wheels, the magnetic wheels can be designed to tightly attach the device to the blade body and the blade root, and the flexible array eddy current probe 401 and the detected area are tightly attached. The lower rotating wheel 302 is of a universal wheel structure with universal joints 306, and the universal wheel design can achieve that the scanning track of the device is consistent with the travel track of the upper rotating wheel 301 at the blade body part, so that the scanning path deviation caused by the movement interference of the lower rotating wheel 302 is avoided. One end of the cylindrical rod 201 is connected with the probe 4, the other end is sleeved with a spring 203 and then penetrates through the rotating body 103, the spring design can realize elastic expansion and contraction of the array eddy current probe, and the stability of coupling and the reliability of detection results are ensured. The rotator 103 comprises rotating sleeves 105 and rotating shafts 106, each rotating sleeve 105 is circumferentially provided with a rotary positioning bolt 108, at least one rotating sleeve 105 is circumferentially provided with an external bolt 104, the external bolt 104 is of a cylindrical external thread structure and is used for externally connecting an operating rod, the rotating sleeves 105 and the rotating shafts 106 are provided with angle scales 107, the rotating body can be designed to realize rotation of a probe in a scanning plane, the device can be suitable for detection of rounding of blade bodies and blade roots of air compressor blades with different sizes, and the angle scales can be designed to realize stabilization of detection parameters and facilitate establishment of technological rules. The profiling body 403 of the probe 4 is profiled with the blade body and the blade root in a rounded shape, the liquid bag 402 is connected between the profiling body 403 and the flexible array eddy current probe 401 in an interlayer mode, and the flexible-profiling body-liquid bag design avoids the problem of unstable detection signals caused by the fact that the probe is not tightly coupled with a rounding region due to the fact that the rounding profile changes from the air inlet side to the air outlet side or the device is slightly swayed during scanning.
The cylindrical rod 201 penetrates through a round hole of the rotating shaft 106 of the rotating body 103, a rotating limiting hole 204 is formed, small-amplitude rotation of the probe on the vertical axis of the detection surface can be realized through the design of the limiting hole, tight coupling of the probe and a detected area in the scanning process is ensured, and meanwhile, the problem that the probe is out of position or slides out of a scanning path due to large-amplitude rotation is avoided.
The upper rotating wheel 301 is a double magnetic wheel, the lower rotating wheel 302 is a single magnetic wheel, and the single-double magnetic wheel design utilizes the triangle stabilization principle, so that the stabilization and the shaking prevention of the device can be realized. The height of the rotating wheel can be adjusted by the upper wheel frame 303 and the lower wheel frame 304, the positioning bolts 305 are used for positioning, and the design of the adjustable height ensures that the device can adapt to the detection of the rounding of the blade bodies and the blade roots of the compressor blades with different sizes.
The flexible array eddy current probe 401 is a coil surface array eddy current probe, the number of coils is not less than 64, the surface array eddy current design can realize effective detection of crack defects in different orientations, 64 coils can ensure full coverage of the crack defects in a rounding region, and not only can the detection efficiency be improved, but also the reliability of the detection result can be ensured.
The invention provides a method for detecting vortex of a blade body and a blade root rounding array of a compressor blade, which comprises the following steps:
the first step: the probe 4 is arranged on the supporting rod 2, the supporting rod 2 is arranged in the main support 1, the upper rotating wheel 301 is magnetically connected with the blade body, and the lower rotating wheel 302 is magnetically connected with the blade root platform;
and a second step of: the heights of the upper wheel frame 303 and the lower wheel frame 304 are adjusted according to the size of the detected blade, so that the imitation body 403 of the probe 4 is tightly attached to the blade body and the blade root rounding;
and a third step of: the probe 4 is connected into the main machine of the array eddy current detector, the main bracket 1 is manually pushed, the scanning is slowly performed from the air inlet to the air outlet, and the eddy current impedance signal characteristics of the main machine are synchronously observed;
fourth step: if the detection is performed during the machine set temporary stop period, the control rod can be externally connected, and the control rod bypasses the IGV blade pushing device in the air inlet volute to scan the first-stage moving blade of the air compressor along the air inlet side to the air outlet side.
The external bolt 104 of the main support 1 is of a cylindrical external thread structure and is used for externally connecting an operating lever.
The rotating sleeve 105 and the rotating shaft 106 of the rotating body 103 are positioned by bolts.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (6)
1. The device for detecting the vortex of the blade body and the blade root of the compressor blade by using the circular array is characterized by comprising a main bracket (1), a supporting rod (2), a sliding wheel (3) and a probe (4);
the main support (1) comprises an upper support (101), a lower support (102) and a rotating body (103), the support rod (2) comprises a cylindrical rod (201), a nut (202) and a spring (203), and the support rod comprises an upper rotating wheel (301), a lower rotating wheel (302), an upper wheel frame (303) and a lower wheel frame (304);
the upper support (101) is connected with the lower support (102) through the rotating body (103), the upper support (101) is connected with the upper wheel frame (303), the lower support (102) is connected with the lower wheel frame (304), one end of the cylindrical rod (201) is connected with the probe (4), the other end of the cylindrical rod is sleeved with the spring (203) and then penetrates through the rotating body (103) and is in threaded connection with the nut (202), and the probe (4) is provided with the imitation body (403);
the rotating body (103) comprises a rotating shaft (106) and a rotating sleeve (105) sleeved on the rotating shaft (106), and the upper bracket (101) and the lower bracket (102) are respectively connected with the rotating sleeve (105);
the upper rotating wheel (301) and the lower rotating wheel (302) are magnetic wheels, and the lower rotating wheel (302) is of a universal wheel structure with a universal joint (306);
the probe (4) further comprises a flexible array eddy current probe (401) and a liquid bag (402), the profiling body (403) of the probe (4) is in a profiling design with a blade body and a blade root in a reverse circular shape, the liquid bag (402) is connected between the profiling body (403) and the flexible array eddy current probe (401) in an interlayer mode, the flexible array eddy current probe (401) is a coil surface array eddy current probe, and the coil number is not less than 64;
the cylindrical rod (201) penetrates through a circular hole of a rotating shaft (106) of the rotating body (103), a rotation limiting hole (204) is formed, the rotation limiting hole (204) can realize small-amplitude rotation of the probe (4) on a vertical axis of the detection surface, tight coupling of the probe (4) and a detected area in the scanning process is ensured, and meanwhile, the problem that the probe (4) is out of position or slides out of a scanning path due to large-amplitude rotation is avoided.
2. The compressor blade body and blade root rounded array vortex detection device according to claim 1, wherein the rotating sleeve (105) and the rotating shaft (106) are provided with angle scales (107).
3. The device for detecting the vortex of the rounded array of the blade body and the blade root of the compressor blade according to claim 1, wherein a rotary positioning bolt (108) is arranged on the circumference of each rotary sleeve (105), an external bolt (104) is arranged on the circumference of at least one rotary sleeve (105), and the external bolt (104) is of a cylindrical external thread structure and is used for externally connecting an operating lever.
4. The compressor blade body and blade root rounded array vortex detection device according to claim 1, wherein the rotating sleeve (105) and the rotating shaft (106) of the rotating body (103) are positioned by bolts.
5. The device for detecting vortex flow of a rounded array of blade bodies and blade roots of a compressor blade according to claim 1, wherein the upper rotating wheel (301) is a double magnetic wheel, the lower rotating wheel (302) is a single magnetic wheel, the heights of the rotating wheels can be adjusted by the upper wheel frame (303) and the lower wheel frame (304), and the rotating wheels are positioned by positioning bolts (305).
6. A method for detecting a blade body and blade root rounding array vortex of a compressor blade, which is characterized in that the method is based on the device for detecting the blade body and blade root rounding array vortex of the compressor blade according to any one of claims 1 to 5, and comprises the following steps:
the first step: the probe (4) is arranged on the supporting rod (2), the supporting rod (2) is arranged in the main support (1), the upper rotating wheel (301) is magnetically connected with the blade body, and the lower rotating wheel (302) is magnetically connected with the blade root platform;
and a second step of: the heights of the upper wheel frame (303) and the lower wheel frame (304) are adjusted according to the size of the detected blade, so that the profiling body (403) of the probe (4) is tightly attached to the blade body and the blade root by rounding;
and a third step of: the probe (4) is connected into the main machine of the array eddy current detector, the main bracket (1) is manually pushed, the eddy current impedance signal characteristics of the main machine are synchronously observed when the probe is scanned slowly from the air inlet side to the air outlet side;
fourth step: if the detection is performed during the machine set temporary stop, a control rod can be externally connected, and the control rod can push the device to scan along the air inlet to the air outlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011316470.0A CN112362730B (en) | 2020-11-20 | 2020-11-20 | Device and method for detecting vortex of blade body and blade root rounding array of compressor blade |
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| CN202011316470.0A CN112362730B (en) | 2020-11-20 | 2020-11-20 | Device and method for detecting vortex of blade body and blade root rounding array of compressor blade |
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| CN112362730A CN112362730A (en) | 2021-02-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113109425B (en) * | 2021-03-16 | 2023-06-30 | 北京工业大学 | Micro-magnetic detection device for ferromagnetic blade |
| KR102624517B1 (en) * | 2022-01-18 | 2024-01-12 | 주식회사 파워인스 | Non-destructive inspection apparatus for turbine blade |
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| JP2012181097A (en) * | 2011-03-01 | 2012-09-20 | Hitachi-Ge Nuclear Energy Ltd | Structure flaw inspection method and device |
| CN103018340A (en) * | 2012-12-26 | 2013-04-03 | 山东省特种设备检验研究院 | Scanning frame for TOFD detection of minor-diameter thick-wall equipment |
| CN213398325U (en) * | 2020-11-20 | 2021-06-08 | 西安热工研究院有限公司 | Compressor blade body and blade root radius array eddy current testing device |
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