CN209821135U - Small-angle longitudinal wave inclined probe with replaceable wedge block for detecting T-shaped root of turbine blade - Google Patents
Small-angle longitudinal wave inclined probe with replaceable wedge block for detecting T-shaped root of turbine blade Download PDFInfo
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- CN209821135U CN209821135U CN201920096489.5U CN201920096489U CN209821135U CN 209821135 U CN209821135 U CN 209821135U CN 201920096489 U CN201920096489 U CN 201920096489U CN 209821135 U CN209821135 U CN 209821135U
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- longitudinal wave
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Abstract
The utility model discloses a small-angle longitudinal wave oblique probe with replaceable wedge block for detecting T-shaped root of a turbine blade, wherein the wedge block and a thread bush are installed in a matching way through threads, the wedge block is installed at the bottom end of a shell, a piezoelectric wafer is placed in the shell, the upper surface of the piezoelectric wafer is plated with a piezoelectric wafer negative electrode layer through magnetron sputtering, the lower surface of the piezoelectric wafer is plated with a piezoelectric wafer positive electrode layer through magnetron sputtering, the lower surface of the piezoelectric wafer positive electrode layer is solidified with a matching layer through epoxy glue, the upper surface of the piezoelectric wafer negative electrode layer is solidified with a backing block material through epoxy glue, a positive electrode lead is welded on the piezoelectric wafer positive electrode layer, a negative electrode lead is welded on the piezoelectric wafer negative electrode layer, an electrical module is connected between the positive electrode lead and the negative electrode lead in parallel, the positive, the piezoelectric wafer, the matching layer and the backing block material are filled in the inner lining sleeve copper pipe.
Description
Technical Field
The utility model relates to a steam turbine blade T type root detects with small-angle longitudinal wave oblique probe of removable voussoir belongs to supersound nondestructive test technical field.
Background
The steam turbine is a main part of a thermal power plant, and the blades of the steam turbine are the life lines of the steam turbine, and the structural integrity of the blades is an important factor for ensuring the safe operation of the steam turbine. Over the years, many instances of blade damage have been discovered, which not only affect production, but also cause damage to other blades. In the past, only the exposed working part of the blade is focused on detection, and the detection of the blade root (inserted into the rim part) is ignored. The root of the blade is stressed greatly and corroded seriously, and stress corrosion emission fracture is easy to generate.
The turbine blade always uses the ultrasonic small-angle probe, and because the defect orientation of the turbine blade root is more, the ultrasonic small-angle probe with various angles is often required to be used. The oblique probe is a probe with ultrasonic oblique incidence, and can detect defects in the welding seam from two sides of the welding seam through oblique incidence to the welding seam. As shown in fig. 1, such oblique incidence is generated by a wedge, and due to the difference in acoustic velocity between the wedge and austenitic steel, the sound wave emitted by a probe is reflected and refracted at the interface (acoustic interface) between the wedge and a workpiece to be detected, and the magnitude of the refraction angle is related to the incident angle and the acoustic velocity on both sides of the interface, and the law follows the well-known Snell's law:where the index i represents the incident medium, the index t represents the refractive medium, and c represents the speed of sound in the medium. It can be found from the formula that the larger the incident angle, the larger the refraction angle, and the refraction angle can be changed by changing the incident angle. The angle of incidence is equal to the angle of inclination of the wedge, so that a change in angle of incidence requires a change in the angle of inclination of the wedge. The conventional probe is generally characterized in that the probe and the wedge block are bonded together and cannot be separated, so that the angle of the wedge block of the ultrasonic probe is fixed,resulting in a refracted longitudinal wave of only one angle. This patent designs an ultrasonic wave oblique probe of removable voussoir through changing the voussoir for can produce the longitudinal wave of different angles, this kind of voussoir replacement method is fairly simple and easy.
Disclosure of Invention
To the above problem, the to-be-solved technical problem of the utility model is to provide a steam turbine blade T type root detects with low-angle longitudinal wave oblique probe of removable voussoir, through the change of low-angle longitudinal wave voussoir, realizes producing the refraction longitudinal wave of different angles to can detect steam turbine blade T type root, improve the detection effect, avoid lou examining.
The utility model discloses a steam turbine blade T type root detects with low-angle longitudinal wave oblique probe of removable voussoir, voussoir 1-14 and thread bush 1-13 match the installation through screw 1-12, voussoir 1-14 installs in the bottom of shell 1-11, piezoelectric wafer 1-3 place in shell 1-11, the upper surface of piezoelectric wafer 1-3 plated piezoelectric wafer negative electrode layer 1-4 through magnetron sputtering, the lower surface of piezoelectric wafer 1-3 plated piezoelectric wafer positive electrode layer 1-2 through magnetron sputtering, the lower surface of piezoelectric wafer positive electrode layer 1-2 through the solidification of epoxy glue have matching layer 1-1, the upper surface filler block of piezoelectric wafer negative electrode layer 1-4 has back of body material 1-5 through the solidification of epoxy glue, the positive electrode lead 1-6 is welded on the positive electrode layer 1-2 of the piezoelectric wafer, the negative electrode lead 1-8 is welded on the negative electrode layer 1-4 of the piezoelectric wafer, the electric module 1-9 is connected between the positive electrode lead 1-6 and the negative electrode lead 1-8 in parallel, the positive electrode lead 1-6 and the negative electrode lead 1-8 are connected on the interface 1-7, the piezoelectric wafer 1-3, the matching layer 1-1 and the backing block material 1-5 are arranged in the copper pipe 1-10 of the inner bushing, and the copper pipe 1-10 of the inner bushing plays a role in shielding.
Further, the matching layer 1-1 can be prepared by using polymers and fillers according to different filling ratios.
Further, the piezoelectric wafers 1 to 3 are piezoelectric ceramics.
Further, the backing block materials 1-5 are high-acoustic impedance and high-acoustic attenuation composite materials containing air holes, for example, tungsten powder with high filling ratio is filled in epoxy resin to prepare a backing, in order to improve the acoustic attenuation coefficient, the flexibility of the base material is properly increased, namely, modification treatment is carried out, and the method is realized by adding polysulfide rubber.
Furthermore, the wedge blocks 1-14 are made of organic glass materials.
The utility model has the advantages that: the utility model discloses a change of low-angle longitudinal wave voussoir realizes producing the refraction longitudinal wave of different angles to can detect turbine blade T type root, improve the detection effect, avoid lou examining.
Drawings
For ease of illustration, the invention is described in detail by the following detailed description and accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-1 matching layer, 1-2 piezoelectric wafer positive electrode layer, 1-3 piezoelectric wafer, 1-4 piezoelectric wafer negative electrode layer, 1-5 backing block material, 1-6 positive electrode lead, 1-7 interface, 1-8 negative electrode lead, 1-9 electrical module, 1-10 inner bushing copper pipe, 1-11 shell, 1-12 screw thread, 1-13 screw thread bushing and 1-14 wedge block.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in figure 1, the small-angle longitudinal wave angle probe of the replaceable wedge block for the T-shaped root detection of the steam turbine blade is characterized in that the wedge block 1-14 and the thread sleeve 1-13 are installed in a matching mode through threads 1-12, the wedge block 1-14 is installed at the bottom end of a shell 1-11, the piezoelectric wafer 1-3 is placed in the shell 1-11, the upper surface of the piezoelectric wafer 1-3 is plated with a piezoelectric wafer negative electrode layer 1-4 through magnetron sputtering, the lower surface of the piezoelectric wafer 1-3 is plated with a piezoelectric wafer positive electrode layer 1-2 through magnetron sputtering, the lower surface of the piezoelectric wafer positive electrode layer 1-2 is solidified with a matching layer 1-1 through epoxy glue, the upper surface of the piezoelectric wafer negative electrode layer 1-4 is solidified with backing block materials 1-5 through epoxy glue, the positive electrode lead 1-6 is welded on the positive electrode layer 1-2 of the piezoelectric wafer, the negative electrode lead 1-8 is welded on the negative electrode layer 1-4 of the piezoelectric wafer, the electric module 1-9 is connected between the positive electrode lead 1-6 and the negative electrode lead 1-8 in parallel, the positive electrode lead 1-6 and the negative electrode lead 1-8 are connected on the interface 1-7, the piezoelectric wafer 1-3, the matching layer 1-1 and the backing block material 1-5 are arranged in the copper pipe 1-10 of the inner bushing, and the copper pipe 1-10 of the inner bushing plays a role in shielding.
Specifically, the matching layer 1-1 can be prepared by adopting polymers and fillers according to different filling ratios, the piezoelectric wafer 1-3 is piezoelectric ceramic, the backing block material 1-5 is a composite material with high acoustic impedance and high acoustic attenuation and containing air holes, for example, tungsten powder with high filling ratio is filled in epoxy resin to prepare a backing, modification treatment is carried out for improving acoustic attenuation coefficient and properly increasing flexibility of a base material, and the wedge block 1-14 is processed by adopting an organic glass material by adding polysulfide rubber.
The basic principles and main features of the present invention, the advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A small-angle longitudinal wave angle probe with replaceable wedge block for detecting T-shaped root of turbine blade features that the wedge block and screw sleeve are matched by screw thread, the wedge block is installed to the bottom of casing, piezoelectric wafer is put in the casing, the negative electrode layer of piezoelectric wafer is plated on the upper surface of piezoelectric wafer by magnetron sputtering, the positive electrode layer of piezoelectric wafer is plated on the lower surface of piezoelectric wafer by magnetron sputtering, the matching layer is solidified on the lower surface of positive electrode layer of piezoelectric wafer by epoxy glue, the backing block is solidified on the upper surface of negative electrode layer of piezoelectric wafer by epoxy glue, the positive lead is welded to the positive electrode layer of piezoelectric wafer, the negative lead is welded to the negative electrode layer of piezoelectric wafer, the electric module is parallelly connected between positive and negative leads, which are connected to interface, the piezoelectric wafer, the matching layer and the backing block material are filled in the inner lining sleeve copper pipe.
2. The small angle longitudinal wave inclination probe of replaceable wedge for detecting T-root of turbine blade according to claim 1, wherein: the matching layer can be prepared by adopting polymers and fillers according to different filling ratios.
3. The small angle longitudinal wave inclination probe of replaceable wedge for detecting T-root of turbine blade according to claim 1, wherein: the piezoelectric wafer is piezoelectric ceramic.
4. The small angle longitudinal wave inclination probe of replaceable wedge for detecting T-root of turbine blade according to claim 1, wherein: the backing block material is a composite material with high acoustic impedance and high acoustic attenuation and containing air holes.
5. The small angle longitudinal wave inclination probe of replaceable wedge for detecting T-root of turbine blade according to claim 1, wherein: the wedge block is made of organic glass material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920096489.5U CN209821135U (en) | 2019-01-21 | 2019-01-21 | Small-angle longitudinal wave inclined probe with replaceable wedge block for detecting T-shaped root of turbine blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920096489.5U CN209821135U (en) | 2019-01-21 | 2019-01-21 | Small-angle longitudinal wave inclined probe with replaceable wedge block for detecting T-shaped root of turbine blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209821135U true CN209821135U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920096489.5U Active CN209821135U (en) | 2019-01-21 | 2019-01-21 | Small-angle longitudinal wave inclined probe with replaceable wedge block for detecting T-shaped root of turbine blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209821135U (en) |
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2019
- 2019-01-21 CN CN201920096489.5U patent/CN209821135U/en active Active
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| TR01 | Transfer of patent right |
Effective date of registration: 20231007 Address after: 055450 North Section Road West, Gongxing Street, Baixiang County, Xingtai City, Hebei Province Patentee after: HEBEI AOSUO ELECTRONIC TECHNOLOGY CO.,LTD. Address before: 201800 North Unit, 3rd Floor, Block E, No. 468 Xinlai Road, Jiading District, Shanghai Patentee before: Aosheng (Shanghai) Electronic Technology Co.,Ltd. |