CN217605759U - Reference test block for ultrasonic detection of water turbine runner blade - Google Patents
Reference test block for ultrasonic detection of water turbine runner blade Download PDFInfo
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- CN217605759U CN217605759U CN202221400712.9U CN202221400712U CN217605759U CN 217605759 U CN217605759 U CN 217605759U CN 202221400712 U CN202221400712 U CN 202221400712U CN 217605759 U CN217605759 U CN 217605759U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02E10/20—Hydro energy
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Abstract
The application relates to a reference test block for ultrasonic detection of a water turbine runner blade, wherein the whole reference test block (5) is strip-shaped, the left side surface is a vertical surface (1), and the right side surface is formed by symmetrically arranging two semi-circular arc surfaces (8 and 9); a small transverse through hole (2) for simulating defects is arranged in the middle of one side, close to the vertical surface (1), of the reference test block (5), and a first large transverse through hole group (4) and a second large transverse through hole group (7) are arranged on one side, close to the bottom surface. The reference test block can be used for calibrating the sound velocity, manufacturing a DAC curve, calibrating the time delay of a calibration probe, calibrating the detection sensitivity and verifying the effectiveness of the detection process, and can solve the problems of low signal-to-noise ratio, easy confusion of defect signals, low detection accuracy and the like of the ultrasonic detection of the runner blade and the blade weld joint of a hydraulic power plant. In addition, this application references the test block and has further integrated the setting to the blade and the welding seam ultrasonic testing between blade and the crown.
Description
Technical Field
The application relates to the technical field of nondestructive testing, in particular to a reference test block for ultrasonic testing of water turbine runner blades.
Background
In a hydraulic power plant, the blade profile of a runner blade of a hydraulic turbine is a curved surface shape with a space variable cross section, and the thickness interface changes greatly. The blade is formed by casting, and then the blade is connected with the upper crown and the lower crown into a whole in a welding mode. Due to the unstable water flow and the complex operation condition, the blades vibrate, regular cracks and irregular cracks are easily generated near the welding areas of the upper crown, the lower crown and the blades of the rotating wheel, the operation faults of a unit are caused, and the large economic loss and the safe operation of equipment are caused.
The nondestructive testing technology of the water turbine runner blade is applied to each stage of manufacturing, mounting and maintenance, is beneficial to finding and processing defects as soon as possible, and has important significance for improving the safe operation and the working efficiency of a hydropower station.
As the blade and the blade welding line are typical coarse-grained structures, the crystal grains are coarse, and the structural noise is strong. The traditional ultrasonic detection reference block is adopted, the signal-to-noise ratio is low, the defect signals are easy to be confused in noise to cause the defect signals to be unrecognizable, and the defect detection rate and accuracy are seriously influenced.
Disclosure of Invention
The technical problem that this application will be solved provides a hydraulic turbine runner blade reference test block for ultrasonic testing who improves defect detectable rate and accuracy.
In order to solve the problems, the application provides a reference test block for ultrasonic detection of a water turbine runner blade, the reference test block is integrally strip-shaped, the left side surface is a vertical surface, the right side surface is symmetrically arranged by two semi-circular arc surfaces, the radius is 1/2h, and h is the height of the reference test block; the middle position of the reference test block close to one side of the vertical surface is provided with a small transverse through hole for simulating defects, one side close to the bottom surface is provided with a first large transverse through hole group and a second large transverse through hole group, the first large transverse through hole group is uniformly distributed along the vertical direction from the bottom surface according to different burial depths, and the second large transverse through hole group is uniformly distributed along a 45-degree linear form from the bottom surface.
Preferably, the reference block further comprises a third large transverse through hole group and a fourth large transverse through hole group which are arranged near one side of the top surface and are respectively arranged in axial symmetry with the first large transverse through hole group and the second large transverse through hole group.
Preferably, the diameter of the small transverse through hole is 1mm, and the diameter of the first large transverse through hole group and the diameter of the second large transverse through hole group are 2mm.
The reference test block is integrally formed and made of martensitic stainless steel.
Compared with the prior art, the method has the following advantages:
the reference test block can be used for calibrating the sound velocity, manufacturing a DAC curve, calibrating the time delay of a calibration probe and detecting the sensitivity and verifying the effectiveness of a detection process, and can solve the problems that the ultrasonic detection signal-to-noise ratio of the runner blade and the blade welding line of a hydraulic power plant is low, a defect signal is easy to be confused, the detection accuracy is low and the like.
In addition, the reference test block further integrates the setting for ultrasonic detection of the welding seam between the blade and the upper crown.
Drawings
The following description of the embodiments of the present application will be made in detail with reference to the accompanying drawings.
Fig. 1 is a front view of a reference block for ultrasonic testing of turbine runner blades according to an embodiment of the present application.
Fig. 2 is a side view of a reference block for ultrasonic testing of turbine runner blades according to an embodiment of the present application.
Fig. 3 is a top view of a reference block for ultrasonic testing of turbine runner blades according to an embodiment of the present application.
In the figure: 1-vertical surface, 2-small transverse through hole, 3-third large transverse through hole group, 4-first large transverse through hole group, 5-reference test block, 6-fourth large transverse through hole group, 7-second large transverse through hole group, and 8, 9-semi-circular arc surface.
Detailed Description
Referring to fig. 1 to 3, the present embodiment provides a reference block for ultrasonic testing of a turbine runner blade, where the reference block 5 is a strip shape as a whole, and is made of martensitic stainless steel, preferably ZG0Cr13Ni5Mo, and has a height h of 100mm, a width w of 30mm, and a length L of 300mm.
The reference test block is made of martensitic stainless steel: the martensitic steel welded joint has cold cracking and embrittlement phenomena, and has poor thermal conductivity, large welding residual stress, large crystal grains and strong structural noise. The traditional ultrasonic detection reference block is adopted, the signal-to-noise ratio is low, the defect signals are easy to be confused in noise to cause the defect signals to be unrecognizable, and the defect detection rate and accuracy are seriously influenced.
The reference test block 5 is integrally formed, the left side surface is a vertical surface 1, the right side surface is two semicircular arc surfaces 8 and 9 which are symmetrically arranged, the radius is 1/2h, the arc surfaces are opposite, the bottom surface is a horizontal plane, and the top surface is a 150-degree concave surface.
A small transverse through hole 2 for simulating defects is arranged in the middle of one side, close to the vertical surface 1, of the reference test block 5, and a first large transverse through hole group 4 and a second large transverse through hole group 7 are arranged on one side, close to the bottom surface. The diameter of the small transverse through hole 2 is 1mm, and the diameters of the first large transverse through hole group 4 and the second large transverse through hole group 7 are both 2mm. "transverse" means through the front and rear walls of the reference block 5.
The through-hole quantity of first big horizontal through-hole group 4 is 4, starts from the bottom surface and follows different buried depth equipartitions according to vertical direction, for example according to setting up apart from bottom surface 10mm, 20mm, 30mm, 40mm, and the through-hole quantity of the big horizontal through-hole group 7 of second is 6, starts along 45 line types equipartitions from the bottom surface, for example according to setting up apart from bottom surface lower 5mm, 10mm, 15mm, 20mm, 25mm, 30 mm. In actual manufacturing, the first large transverse through hole group 4 and the second large transverse through hole group 7 are staggered as much as possible on the premise that the length satisfies the requirement.
When the device is used, the small transverse through hole 2 is used for positioning and quantitatively calibrating the simulation defects between the upper concave surface and the lower plane after the instrument calibration is completed. The semi-circular arc surfaces 8 and 9 are used for time delay and sound velocity calibration of the ultrasonic detection probe and are also used for front edge measurement of the probe. The first large transverse through hole group 4 and the second large transverse through hole group 7 are designed according to the blades of the water turbine and are used for meeting the sensitivity simulation and calibration for detecting and finding the minimum defects; when in use, the conventional small-size inclined probe is adopted for calibration.
Aiming at ultrasonic detection of a welding seam between a blade and a crown, the reference test block 5 further comprises a third large transverse through hole group 3 and a fourth large transverse through hole group 6 which are designed by referring to the structural design of the welding seam between the blade and the crown of the water turbine, and is used for meeting the requirements of sensitivity simulation and calibration for detecting and finding the minimum defect. The third large transverse through hole group 3 and the fourth large transverse through hole group 6 are arranged on one side close to the top surface and are respectively arranged in axial symmetry with the first large transverse through hole group 4 and the second large transverse through hole group 7.
When in use, the probe is adapted to the radian of the top surface. The third large transverse through hole group 3 can be used for testing the ultrasonic angle resolution; the fourth large transverse through hole group 6 is used for the fabrication of the TCG/DAC curve.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the structure and the core concept of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (4)
1. A reference test block for ultrasonic detection of water turbine runner blades is characterized in that the whole reference test block (5) is strip-shaped, the left side surface is a vertical surface (1), the right side surface is formed by symmetrically arranging two semi-circular arc surfaces (8, 9), the radius is 1/2h, and h is the height of the reference test block (5); the reference test block (5) is close to the middle position of one side of the vertical surface (1) is provided with a small transverse through hole (2) for simulating defects, one side of the reference test block close to the bottom surface is provided with a first large transverse through hole group (4) and a second large transverse through hole group (7), the first large transverse through hole group (4) is uniformly distributed along the vertical direction along different burial depths from the bottom surface, and the second large transverse through hole group (7) is uniformly distributed along a 45-degree linear form from the bottom surface.
2. The reference block according to claim 1, further comprising a third large transverse through hole group (3) and a fourth large transverse through hole group (6) disposed near one side of the top surface, and disposed axially symmetrically with the first large transverse through hole group (4) and the second large transverse through hole group (7), respectively.
3. The reference block according to claim 1 or 2, wherein the small transverse through hole (2) has a diameter of 1mm and the first and second large transverse through hole groups (4, 7) have a diameter of 2mm.
4. The reference block of claim 1 or 2, wherein the reference block is integrally formed and is made of martensitic stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221400712.9U CN217605759U (en) | 2022-06-07 | 2022-06-07 | Reference test block for ultrasonic detection of water turbine runner blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221400712.9U CN217605759U (en) | 2022-06-07 | 2022-06-07 | Reference test block for ultrasonic detection of water turbine runner blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217605759U true CN217605759U (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221400712.9U Active CN217605759U (en) | 2022-06-07 | 2022-06-07 | Reference test block for ultrasonic detection of water turbine runner blade |
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| CN (1) | CN217605759U (en) |
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2022
- 2022-06-07 CN CN202221400712.9U patent/CN217605759U/en active Active
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