CN209745878U - Generator fan blade reference block - Google Patents
Generator fan blade reference block Download PDFInfo
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- CN209745878U CN209745878U CN201920414999.2U CN201920414999U CN209745878U CN 209745878 U CN209745878 U CN 209745878U CN 201920414999 U CN201920414999 U CN 201920414999U CN 209745878 U CN209745878 U CN 209745878U
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Abstract
A generator fan blade comparison test block comprises a test block body and is characterized in that the test block body is of a cuboid structure, the material of the test block body is the same as that of a turbine generator rotor fan blade, the upper end face of the test block body is an upper detection face, the lower end face of the test block body is a lower detection face, the front end face of the test block body is a front detection face, and the rear end face of the test block body is a rear detection face. The cost is reduced, and the requirement of nondestructive testing of the power system is met.
Description
Technical Field
The utility model relates to a nondestructive test technical field, specific standard simulation crackle contrast test block that adopts when being applicable to electric power turbo generator fan blade ultrasonic testing that says so.
Background
The rotor fan of the turbonator is an important component of a generator cooling system, is assembled at two ends of a generator rotor and rotates at a high speed along with the generator, and has the functions of generating high-pressure high-speed wind, taking away heat of a stator and the rotor and blowing away carbon deposition generated by friction of a carbon brush and a collecting ring. The maximum diameter of the rotor is 1 meter, the rotating speed is 3000 r/min, the generator fan blade consists of a blade body and a blade root tenon, and the connecting part of the blade body and the blade root is in circular arc transition. The generator fan blade is firstly processed by cast aluminum alloy, the subcritical unit is manufactured by high-strength wrought aluminum alloy along with the increase of the unit capacity, and the material of the generator fan is changed to stainless steel along with the introduction of the supercritical unit in recent years. The blade running at high speed throughout the year can generate cracks or fractures due to self material defects or fatigue when rotating at high speed (in reality, the depth and the width of the cracks cannot be measured), ultrasonic flaw detection must be carried out during shutdown maintenance so as to avoid malignant accidents, and a reference test block for simulating the standard amount of the cracks is not developed in the ultrasonic flaw detection for many years, so that hidden dangers are left due to blind judgment.
Disclosure of Invention
in order to solve the problem, the utility model discloses the simulation crackle test block of the different degree of depth and size precision has been designed to the self characteristics that combine turbo generator rotor fan blade.
The utility model discloses a generator fan blade contrast test block, including the test block body, the test block body sets up to the cuboid structure, and the material of test block body is the same with turbo generator rotor fan blade's material, and the up end of test block body sets up to the upper detection face, and the lower terminal surface of test block body sets up to the lower detection face, and the preceding terminal surface of test block body sets up to preceding detection face, and the rear end of test block body sets up to the back detection face; the upper detection surface and the lower detection surface are respectively provided with a groove, and the grooves comprise narrow grooves, middle grooves, wide grooves and huge grooves; the front detection surface and the rear detection surface are both provided with flat bottom holes, and the flat bottom holes comprise flat bottom holes I and flat bottom holes II.
a narrow groove with the length of 10-20 mm and the width of 0.1mm is arranged on one side of the upper detection surface, a middle groove with the length of 10-20 mm and the width of 0.15mm is arranged on the other side of the upper detection surface, and the distance between the narrow groove and the middle groove is 145-200 mm; the narrow grooves comprise a narrow groove I, a narrow groove II and a narrow groove III which are arranged on the same straight line in sequence and have adjacent intervals of 20-30 mm, and the depths of the narrow groove I, the narrow groove II and the narrow groove III are respectively 0.1mm, 0.3mm and 0.5 mm; the middle groove comprises a middle groove I, a middle groove II and a middle groove III which are sequentially arranged on the same straight line and have adjacent intervals of 20-30 mm, and the depths of the middle groove I, the middle groove II and the middle groove III are respectively 0.8mm, 1.0mm and 1.2 mm.
The utility model discloses a width detection device, including detection face, width recess I, width recess II, width recess III, the one side middle part of detection face is provided with the huge recess that length is 10mm ~ 20mm, width is 0.3mm, the degree of depth is 5mm down, the opposite side of detection face is provided with the wide recess that length is 10mm ~ 20mm, width is 0.2mm down, wide recess is including setting gradually adjacent interval on the collinear wide recess I, wide recess II, wide recess III for 20mm ~ 30mm, the degree of depth of wide recess I, wide recess II, wide recess III is 1.5mm, 2.0mm, 2.5mm respectively.
A flat bottom hole II is formed in one side of the front detection surface, the diameter of the flat bottom hole II is 0.4mm, and the depth of the flat bottom hole II is 20 mm-30 mm; a flat bottom hole I is formed in one side of the rear detection surface, the diameter of the flat bottom hole I is 0.5mm, and the depth of the flat bottom hole I is 30-40 mm; the axes of the flat bottom hole I and the flat bottom hole II are positioned on the same straight line, and the distance between the axis and the upper detection surface is 1-2 mm.
These grooves of different widths and depths are used to simulate openings or near-surface crack defects of different fracture depths, and the flat-bottom holes are used to simulate near-surface, i.e., inside the material without crack defects visible from the surface.
the utility model discloses a simulation defect contrast test block of high accuracy size, the rectangle recess that utilizes the different degree of depth and width during ultrasonic inspection and the flat bottom hole supersound standard measurement calibration value of different diameters, can be accurate carry out the measurement of length and the degree of depth and compare to the surface crack or the nearly surface crack defect that the blade produced when high-speed rotation to can carry out accurate location and ration to the defect, avoid the erroneous judgement, the precision and the efficiency of detection have been improved, the cost is reduced, the needs of electric power system nondestructive test have been satisfied.
Description of the drawings:
Figure 1 is a schematic view of the structure of the utility model,
Figure 2 is a schematic top view of the present invention,
Fig. 3 is a schematic view of the bottom view structure of the present invention, in which:
1. The test block body, 2, go up the detection face, 3, flat bottom hole, 31, flat bottom hole I, 32, flat bottom hole II, 4, narrow recess, 41, narrow recess I, 42, narrow recess II, 43, narrow recess III, 5, huge recess, 6, lower detection face, 7, wide recess, 71, wide recess I, 72, wide recess II, 73, wide recess III, 8, well recess, 81, well recess I, 82, well recess II, 83 well recess III, 9, preceding detection face, 10, the back detection face.
the specific implementation mode is as follows:
The present invention is further described in detail with reference to the attached drawings 1, 2 and 3 so that the public can better master the implementation method of the present invention, and the specific implementation scheme of the present invention is:
The generator fan blade comparison test block comprises a test block body 1, wherein the test block body 1 is of a cuboid structure, the material of the test block body 1 is the same as that of a turbine generator rotor fan blade, the upper end face of the test block body 1 is provided with an upper detection face 2, the lower end face of the test block body 1 is provided with a lower detection face 6, the front end face of the test block body 1 is provided with a front detection face 9, and the rear end face of the test block body 1 is provided with a rear detection face 10; grooves are formed in the upper detection surface 2 and the lower detection surface 6, and comprise narrow grooves 4, middle grooves 8, wide grooves 7 and huge grooves 5; all be provided with flat bottom hole 3 on preceding detection face 9 and the back detection face 10, flat bottom hole 3 is including flat bottom hole I31 and flat bottom hole II 32.
A narrow groove 4 with the length of 10-20 mm and the width of 0.1mm is formed in one side of the upper detection surface 2, a middle groove 8 with the length of 10-20 mm and the width of 0.15mm is formed in the other side of the upper detection surface 2, and the distance between the narrow groove 4 and the middle groove 8 is 145-200 mm; the narrow grooves 4 comprise a narrow groove I41, a narrow groove II 42 and a narrow groove III 43 which are arranged on the same straight line in sequence and have adjacent intervals of 20-30 mm, and the depths of the narrow groove I41, the narrow groove II 42 and the narrow groove III 43 are respectively 0.1mm, 0.3mm and 0.5 mm; the middle groove 8 comprises a middle groove I81, a middle groove II 82 and a middle groove III 83 which are sequentially arranged on the same straight line and have adjacent intervals of 20-30 mm, and the depths of the middle groove I81, the middle groove II 82 and the middle groove III 83 are respectively 0.8mm, 1.0mm and 1.2 mm.
The lower detection surface 6 one side middle part be provided with length for 10mm ~ 20mm, width be 0.3mm, the degree of depth be 5 mm's huge recess 5, the opposite side of lower detection surface 6 is provided with length for 10mm ~ 20mm, width be 0.2mm wide recess 7, wide recess 7 is including setting gradually on the same straight line adjacent interval be 20mm ~ 30mm wide recess I71, wide recess II 72, wide recess III 73, the degree of depth of wide recess I71, wide recess II 72, wide recess III 73 is 1.5mm, 2.0mm, 2.5mm respectively.
A flat-bottom hole II 32 is formed in one side of the front detection surface 9, the diameter of the flat-bottom hole II 32 is 0.4mm, and the depth of the flat-bottom hole II 32 is 20 mm-30 mm; a flat-bottom hole I31 is formed in one side of the rear detection surface 10, the diameter of the flat-bottom hole I31 is 0.5mm, and the depth of the flat-bottom hole I31 is 30 mm-40 mm; the axes of the flat bottom hole I31 and the flat bottom hole II 32 are positioned on the same straight line, and the distance between the axis and the upper detection surface is 1-2 mm.
The perpendicularity of the grooves and the corresponding surfaces is less than or equal to 0.05mm, the grooves with different widths and depths are utilized to simulate openings or near-surface crack defects with different fracture depths, and the flat bottom hole is used to simulate a near-surface, namely the interior of a material, but no crack defects are seen on the surface.
The size precision and the form and position size precision of the groove and the flat-bottom hole can be directly measured, standard sizes are adopted, then the reflected signals of the groove and the flat-bottom hole simulating the sizes of different depth standards of defects are reflected on a display screen of an instrument by using an ultrasonic detection technology, and standard measurement values are made according to the sizes of ultrasonic reflected energy of the rectangular groove and the flat-bottom hole with different widths and depths and the standard sizes of the flat-bottom hole.
in order to effectively avoid the sound wave reflection interference of adjacent grooves to the test groove in ultrasonic detection, the distance between the two grooves is designed to be at least 20mm through the calculation of the sound wave reflection angle and the length, so that the phenomenon is effectively avoided; meanwhile, the attenuation of sound waves is serious after 100mm due to the fact that the propagation energy of ultrasonic waves of the adopted ultrasonic detection technology passes through the material of the test block body, the precision of ultrasonic detection is affected, the distance between two rows of grooves in the designed length direction is at least 145mm, adverse factors caused by the attenuation of the sound waves are effectively avoided, and waste or unreasonable design structure due to overlarge distance size is avoided.
The test block of the utility model: the verticality and the parallelism of the appearance are not more than 0.05mm, the roughness Ra of the detected surface is not more than 1.6 mu m, the roughness Ra of the rest surfaces is not more than 3.2 mu m, and the verticality between the groove and the surface is not more than 0.05 mm.
The utility model discloses a simulation defect contrast test block of high accuracy size, the rectangle recess that utilizes the different degree of depth and width during ultrasonic inspection and the flat bottom hole supersound standard measurement calibration value of different diameters, can be accurate carry out the measurement of length and the degree of depth and compare to the surface crack or the nearly surface crack defect that the blade produced when high-speed rotation to can carry out accurate location and ration to the defect, avoid the erroneous judgement, the precision and the efficiency of detection have been improved, the cost is reduced, the needs of electric power system nondestructive test have been satisfied.
Claims (4)
1. A generator fan blade comparison test block comprises a test block body (1), and is characterized in that the test block body (1) is of a cuboid structure, the material of the test block body (1) is the same as that of a turbine generator rotor fan blade, the upper end face of the test block body (1) is an upper detection face (2), the lower end face of the test block body (1) is a lower detection face (6), the front end face of the test block body (1) is a front detection face (9), and the rear end face of the test block body (1) is a rear detection face (10); grooves are formed in the upper detection surface (2) and the lower detection surface (6) respectively, and comprise narrow grooves (4), middle grooves (8), wide grooves (7) and huge grooves (5); preceding detection face (9) and back detection face (10) are gone up and all are provided with flat bottom hole (3), flat bottom hole (3) are including flat bottom hole I (31) and flat bottom hole II (32).
2. The generator fan blade comparison test block as set forth in claim 1, wherein a narrow groove (4) with a length of 10 mm-20 mm and a width of 0.1mm is provided on one side of the upper detection surface (2), a middle groove (8) with a length of 10 mm-20 mm and a width of 0.15mm is provided on the other side of the upper detection surface (2), and a distance between the narrow groove (4) and the middle groove (8) is set to 145 mm-200 mm; the narrow grooves (4) comprise a narrow groove I (41), a narrow groove II (42) and a narrow groove III (43) which are arranged on the same straight line in sequence and have adjacent intervals of 20-30 mm, and the depths of the narrow groove I (41), the narrow groove II (42) and the narrow groove III (43) are respectively 0.1mm, 0.3mm and 0.5 mm; well recess (8) are including setting gradually on the collinear adjacent interval be middle recess I (81), middle recess II (82), middle recess III (83) of 20mm ~ 30mm, the degree of depth of well recess I (81), middle recess II (82), middle recess III (83) is 0.8mm, 1.0mm, 1.2mm respectively.
3. The generator fan blade comparison test block as set forth in claim 1, wherein a giant groove (5) with a length of 10 mm-20 mm, a width of 0.3mm and a depth of 5mm is arranged in the middle of one side of the lower detection surface (6), a wide groove (7) with a length of 10 mm-20 mm and a width of 0.2mm is arranged on the other side of the lower detection surface (6), the wide groove (7) comprises a wide groove I (71), a wide groove II (72) and a wide groove III (73) which are sequentially arranged on the same straight line and adjacent to each other at a distance of 20 mm-30 mm, and the depths of the wide groove I (71), the wide groove II (72) and the wide groove III (73) are respectively 1.5mm, 2.0mm and 2.5 mm.
4. The generator fan blade comparison test block as set forth in claim 1, wherein a flat bottom hole II (32) is arranged on one side of the front detection surface (9), the diameter of the flat bottom hole II (32) is 0.4mm, and the depth is 20 mm-30 mm; a flat bottom hole I (31) is formed in one side of the rear detection surface (10), the diameter of the flat bottom hole I (31) is 0.5mm, and the depth of the flat bottom hole I (31) is 30-40 mm; the axes of the flat bottom hole I (31) and the flat bottom hole II (32) are positioned on the same straight line, and the distance between the axis and the upper detection surface is 1-2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920414999.2U CN209745878U (en) | 2019-03-29 | 2019-03-29 | Generator fan blade reference block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920414999.2U CN209745878U (en) | 2019-03-29 | 2019-03-29 | Generator fan blade reference block |
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| Publication Number | Publication Date |
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| CN209745878U true CN209745878U (en) | 2019-12-06 |
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| CN201920414999.2U Active CN209745878U (en) | 2019-03-29 | 2019-03-29 | Generator fan blade reference block |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487122A (en) * | 2021-12-30 | 2022-05-13 | 广东核电合营有限公司 | Crack detection method for nuclear power station |
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2019
- 2019-03-29 CN CN201920414999.2U patent/CN209745878U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487122A (en) * | 2021-12-30 | 2022-05-13 | 广东核电合营有限公司 | Crack detection method for nuclear power station |
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