CN208721620U - A kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting - Google Patents
A kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting Download PDFInfo
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- CN208721620U CN208721620U CN201821386978.6U CN201821386978U CN208721620U CN 208721620 U CN208721620 U CN 208721620U CN 201821386978 U CN201821386978 U CN 201821386978U CN 208721620 U CN208721620 U CN 208721620U
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- high temperatures
- electromagnetic acoustic
- shear wave
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Abstract
The utility model discloses a kind of resistant to high temperatures, wear-resisting electromagnetic acoustic shear wave transducer, including shell, inside is formed with closed accommodating chamber；Permanent magnet is housed in the accommodating chamber；Excitation/receiving coil, is encapsulated in the wall surface of shell and towards permanent magnet；The side wall of the accommodating chamber is equipped with cooling medium entrance and cooling medium exports, the cooling medium entrance and cooling medium outlet are connected to external cooling source, excitation/receiving coil lower end surface is concordant with the floor detection face of ultrasonic shear waves energy converter, the wearing layer of 0.4-0.6mm thickness is coated in detection faces, permanent magnet is under low-temperature condition for a long time when work, coil lower end surface is while having protection wear-resistant coating, it can also guarantee its minimum lift off, to both ensure that the wear-resistant of coil, nor affect on its conversion efficiency, when so that energy converter detecting ferrimagnet at high temperature, both conversion efficiency, which can be improved, can also make coil block against damages, it prolongs its service life.
Description
Technical field
The utility model belongs to technical field of nondestructive testing, more particularly to a kind of resistant to high temperatures, wear-resisting electromagnetic acoustic shear wave
Energy converter.
Background technique
Non-destructive testing technology is widely used in aerospace, manufacture, change due to that will not destroy tested object structures, attribute
The fields such as work and medical treatment.For metal material, the technology for being usually used in metal material Performance Evaluation and Inner Defect Testing at present has
Piezoelectric supersonic method, laser-ultrasound method and electromagnetic acoustic method.Conventional piezoelectric supersonic technology, since its ultrasound is to pass through energy converter
Internal piezoelectric chip vibration or deformation generate, when detecting metal material, to reduce its acoustic impedance, it is necessary to testee surface
Pre-process and be used cooperatively fluid couplant, therefore is not suitable for hot environment.Although Laser Ultrasonic Technique is suitable for height
Temperature and couplant is not needed, but its conversion efficiency is lower and detection flaw sensitivity is not high.
Electromagnetic acoustic technology is as a kind of novel Ultrasonic NDT, transducing mechanism relative new, bias magnetic field with
Testee spatial induction eddy current interaction, directly testee become skin layers generate ultrasonic wave.Therefore electromagnetic acoustic skill
Art can carry out field application under the adverse circumstances such as testee rough surface and high temperature.Meanwhile developing lossless under high temperature
Detection technique not only can assess its internal performance when metal material moulding is heat-treated, accomplish save the cost, can also be to height
The in-service equipment of temperature carries out quality inspection, guarantees service safety and the service life of equipment.Currently, carrying out nothing to metal material under high temperature
The related patents for damaging detection technique are less, especially in terms of high-temperature electromagnetic ultrasound detection.Though application publication number CN105675728A
So propose a kind of electromagnetic acoustic detection technique resistant to high temperature and acquisition methods, but its mainly pass through energy converter interior arrangement every
Hot material conducts to alleviate high temperature, therefore the components such as the magnet protected inside energy converter, coil that it can only be of short duration are from high temperature
Damage, cannot long-time continuous on-line detection, sensitivity, signal-to-noise ratio are relatively low.In addition, working as electricity due to the presence of permanent magnet
When magnetic ultrasound detection object is ferrimagnet, a biggish magnetive attraction can be generated between energy converter and testee, is being moved
Being easy to abrasion when dynamic energy converter, it is received and excitation variable winding component.
Summary of the invention
The application aims to solve at least one of the technical problems existing in the prior art.For this purpose, the purpose of this utility model
One of be to provide a kind of resistant to high temperatures, wear-resisting electromagnetic acoustic shear wave transducer, with realize under high temperature to metal material it is long when
Between the online non-destructive testing of continuity requirement.
In order to solve the above technical problems, the utility model adopts the following technical solution:
A kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting, comprising:
Shell, inside are formed with closed accommodating chamber；
Permanent magnet is housed in the accommodating chamber；
Excitation/receiving coil, is encapsulated in the wall surface of shell and towards permanent magnet；
The side wall of the accommodating chamber is equipped with cooling medium entrance and cooling medium and exports, the cooling medium entrance and cold
But media outlet is connected to external cooling source, the lower end surface of the excitation/receiving coil and the bottom of ultrasonic shear waves energy converter
Detection faces are concordant, and the wearing layer of 0.4-0.6mm thickness is coated in the detection faces.
Further, the permanent magnet is vacantly arranged in the accommodating chamber.
Further, the shell is cylindrical, by hollow cylinder and the end cap group for being sealingly disposed in hollow cylinder both ends
At.
Further, be lined with copper foil between the end cap and hollow cylinder, the copper foil and the hollow cylinder it
Between be equipped with sealing element.
Further, the end face at the hollow cylinder both ends is equipped with the annular groove for being suitable for sealing element installation.
Further, the side wall of the hollow cylinder is circumferentially with the supporting element for being used to support permanent magnet.
Further, the supporting element is the fastening screw that sealing runs through hollow cylinder side wall.
Further, the permanent magnet is cylindrical and axis is overlapped with the central axes of the excitation/receiving coil.
Further, the excitation/receiving coil is flat refractory ceramics spiral winding.
Further, installation through-hole is equipped in the end cap below hollow cylinder, the excitation/receiving coil level is set
It is placed in the installation through-hole and is encapsulated by multi-layer high-temperature ceramics glue-line, the refractory ceramics glue-line of top layer and corresponding end cap
Upper surface is concordant.
Further, the two sidewalls for being equipped with excitation/receiving coil end cap are equipped with the through-hole installed for connecting wire,
Excitation/the receiving coil passes through the connecting wire and external signal fittings.
Compared with prior art, the utility model has the beneficial effects that:
1, the utility model is due in permanent magnet is arranged in closed accommodating chamber, by being passed through cooling into closed accommodating chamber
Recirculated water, it can be ensured that energy converter detect at high temperature in use, its interior permanent magnet for a long time be under low-temperature condition, thus
The magnetic field strength of magnetic deflection field can be improved, and then improve sensitivity and the signal-to-noise ratio of ultrasonic transducer.
2, in industry permanent magnet is vacantly arranged in cooling medium for the first time by the present invention, and permanent magnet is vacantly arranged, not only
Be conducive to cooling of the cooling medium to permanent magnet, and the magnetic current flux density of excitation variable winding can be enhanced, promotes electromagnetic acoustic transducer
Energy efficiency and signal-to-noise ratio, can also enhance the purity of electromagnetic acoustic excitation signal, detect so as to improve electromagnetic acoustic and determine to lack
Sunken precision.
3, due to the special mounting technique of excitation receiving coil component, so that coil lower end surface has protection wear-resistant coating
While, it can also be ensured that its minimum lift off nor affected on its transducing effect to both ensure that the wear-resistant of coil
Rate, when so that energy converter detecting ferrimagnet at high temperature, conversion efficiency, which both can be improved, can also make coil block from damage
It is bad, it prolongs its service life.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the explosive view of the utility model；
Fig. 3 is the axonometric drawing of the utility model hollow cylinder；
Fig. 4 is the utility model coil scheme of installation.
Specific embodiment
The utility model is further described below in conjunction with the drawings and specific embodiments.
Referring to figures 1-4, a kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting, including shell 1, permanent magnet 2 and swash
Hair/receiving coil 3.Closed accommodating chamber is formed with inside shell 1, permanent magnet 2 is housed in accommodating chamber, excitation/acceptance line
Circle 3 is encapsulated in the wall surface of shell 1 and is arranged towards permanent magnet 2.Cooling medium entrance 4 and cold is equipped on the side wall of accommodating chamber
But media outlet 5, cooling medium entrance 4 and cooling medium outlet 5 are connected to shape with external cooling source (the included transfer tube in inside)
At cooling circuit.The lower end surface of excitation/receiving coil 3 is concordant with the floor detection face of ultrasonic shear waves energy converter.Wherein, it examines
Survey face is the face that finger transducer is contacted with measured workpiece.The wearing layer 6 of 0.4-0.6mm thickness is coated in detection faces.This implementation
Example, the cooling medium of cooling source can common cooling water.It is envisioned that cooling medium can also be using in the prior art
Other cooling mediums cooling suitable for permanent magnet.
Ultrasonic transducer is the core component of electromagnetic acoustic detection technique, and sensitivity, signal-to-noise ratio are always to limit in fact
The key factor of border engineer application.The present embodiment permanent magnet 2 is arranged in closed accommodating chamber, by leading into closed accommodating chamber
Enter cooling circulating water, 2 long-time of permanent magnet is under low-temperature condition, thus the magnetic field strength of magnetic deflection field can be improved, in turn
Improve sensitivity and the signal-to-noise ratio of ultrasonic transducer.
The sensitivity of ultrasonic transducer, signal-to-noise ratio, in addition to the size of bias magnetic field, mainly by coil in tested metal material
Material becomes, and skin layers are interior to generate the strong and weak influence for inducing eddy current.Excitation variable winding is closer with a distance from tested metal surface, i.e. energy converter
Lift off it is smaller, the induction eddy current of generation will be stronger.Since 3 bottom of excitation/receiving coil sprays in the present embodiment
There is the wearing layer 6 of 0.4-0.6mm thickness, so that coil lower end surface is while having protection wear-resistant coating, when detection, coil can
With contacting with tested metal material surface for maximum possible, reach minimum lift off, thus both ensure that the wear-resistant of coil,
Its conversion efficiency is nor affected on, the sensitivity of ultrasonic transducer is improved.So that energy converter detects ferrimagnet at high temperature
When, conversion efficiency, which both can be improved, can also make coil block against damages, prolong its service life.
It is envisioned that in practical applications, it is manufacture easy to process production, material that shell 1, which can be made cylindric,
Material can use brass, by hollow cylinder 101 and the upper end cover 102 and lower cover 103 that are sealingly disposed in 101 both ends of hollow cylinder
Composition, above-mentioned setting can be in order to dismantling after the installation and use of permanent magnet 2.To improve sealing performance, upper and lower end cap 102,
It is lined with copper foil 7 between 103 and hollow cylinder 101, sealing element 8 is equipped between copper foil 7 and hollow cylinder 101, copper foil is set
Piece 7 can play better seal effect.On the upper and lower end face of hollow cylinder 101 be equipped with annular seal groove 9, sealing element 8
With being mounted in annular seal groove 9.
In practical application, sealing element 8 can use graphite-seal ring.When specific assembling, graphite-seal ring is mounted on ring
In shape seal groove 9, successively covers copper foil 7 and end cap and attachment screw or screw by running through upper copper foil 7 and end cap will
Above-mentioned component is fixed on hollow cylinder 101.
In some embodiments, it is circumferentially laid in the side wall of hollow cylinder 101 and is used to support the supporting element of permanent magnet 2
10, permanent magnet 2 is vacantly arranged in accommodating chamber permanent magnet 2 by above-mentioned supporting element 10 and is vacantly arranged, and facilitates cooling water that can cover
Entire permanent magnet is covered, cooling effect is improved.In concrete application, supporting element 10 can be tight on hollow cylinder 101 using spinning
Gu screw, by screwing fastening screw until abutting against with permanent magnet 2 when installation, and then by 2 clamping fixed of permanent magnet each tight
Gu between screw, to prevent fit-up gap outflow of the cooling water between fastening screw and hollow cylinder 101, fastening screw is screwed
After in place, waterproof can be sealed using by smearing high-temperature seal adhesive.
It is envisioned that reduce the volume of energy converter, excitation/receiving coil 3 can use flat high temperature resistant
Ceramic screw coil, shape can be round, track type or ellipse etc..For improve electromagnetic acoustic signal receiving strength,
It noise reduction and is easily installed, permanent magnet 2 is cylindrical and axis is overlapped with the central axes of excitation/receiving coil 3, and permanent magnet 2 is installed
101 centers inside middle cylinder can specifically use samarium cobalt permanent magnet body.
In practical application, excitation/receiving coil 3 can be installed in the following way: peace is equipped in lower cover 103
Through-hole is filled, excitation/receiving coil 3 is horizontally placed in installation through-hole and encapsulates by multi-layer high-temperature ceramics glue-line 11.High temperature pottery
Porcelain cement is refractory ceramics AB glue, using the refractory ceramics glue of the model double bond DB5012 of Wuhan double bond chemical company, wherein making pottery
Porcelain powder and the control of glue ratio are that details are not described herein for existing well-known technique in 2:0.5 or so.And the high temperature of top layer is made pottery
Porcelain cement layer 11 is concordant with the upper surface of lower cover 101, is equipped on the two sidewalls of lower cover 103 and leads to for what connecting wire installed
Hole, excitation/receiving coil are connected to by connecting wire 12 with external signal connector 13.
This production method for implementing resistant to high temperatures, wear-resisting electromagnetic acoustic shear wave transducer includes the following steps:
Excitation/receiving coil assembling
S 1: it is laid with heat-resisting soft mica paper in the bottom level for needing to install excitation/receiving coil end cap first, is protected
Card installation through-hole is covered by soft mica paper.
S2: excitation and receiving coil are placed side by side in installation through-hole and contacted with the soft mica paper of high temperature, makes line as far as possible
Circle keeps horizontal.
S3: a little refractory ceramics glue is coated uniformly in the installation through-hole for being equipped with excitation and receiving coil, high temperature is made
Until ceramic glue can cover coil surface layer.
S4: after having coated, preliminary drying solidification is carried out to coat using roasting plant, is protected as far as possible during the drying process
It holds coil and end cap lower end surface maintains an equal level.
S5: after the initial application layer of refractory ceramics glue is completed in mounting groove, the coating of the second layer, coat are then carried out
Thickness should be less than being equal to 1mm, carried out after coating is completed drying and it is appropriate give coat and uniformly hammer, convenient for subsequent
Heating cure in will not be deformed, and so on, until coating terminates when n-th layer coat and end cap upper surface maintain an equal level.
S6: the soft mica paper of high temperature of tearing, natural normal temperature cure 22-24 hours, then use ceramic powders and glue (ceramic powder
The type of end and glue is that the refractory ceramics AB glue of double bond DB5012 is identical with Wuhan double bond chemical company production model, is existing
Details are not described herein for well-known technique) it is mixed evenly with 2:0.8 ratio and is sprayed at coil lower end surface, its thickness is controlled in 0.4-
0.6mm, as high temperature resistant, anti abrasive protective layer.
S7: putting the end cap of S6 step into heating furnace further progress hot setting, is heated up to 80 DEG C first, heat preservation 2 is small
When, then 150 DEG C are warming up to, two hours are kept the temperature, then it is allowed to naturally cool to room temperature.
After the installation on the transducer of the coil block of this process Installation, when carrying out high temperature detection, excitation and reception line
Circle has good anti-loosening, anti-deformation and wear-resisting property, while can also guarantee minimum lift off and keep ultrasound inspection
Survey the stability of signal.
Energy converter assembling
S8: after permanent magnet is suspended vacantly in hollow cylinder, excitation/receiving coil lower cover and upper end will be packaged with
Sealing is fixed on hollow cylinder both ends to lid respectively, but medium inlet and cooling medium outlet is connected to external cooling source, shape
At cooling medium circulation loop.
By cooling water temperature and it is detected when high temperature, desired cooling water can be found out according to Newton's law of cooling
Flowing velocity, Newton's law of cooling mathematical description are as follows:
Wherein, φ indicates heat convection rate, and α indicates that convective heat-transfer coefficient, A indicate that heat transfer area, T indicate that fluid is average
Temperature, TwIndicate that the wall surface temperature contacted with fluid, Δ T indicate convective heat transfer temperature difference, R indicates convective heat transfer thermal resistance.
In addition, the induction eddy current that bias magnetic field and excitation variable winding that permanent magnet provides generate interacts, in measured object
The body skin layers that become form ultrasonic signal, this process must satisfy Maxwell's law, that is, meet following mathematical description:
F=J × (Bs+Bd) (2)
Wherein, F indicates that long-range navigation magnetic force, J indicate the induction eddy current that excitation variable winding generates, BsIndicate that permanent magnet generates inclined
Set magnetic field, BdIndicate the dynamic magnetic field that excitation variable winding generates.
The utility model can be used in combination in energy converter internal core component permanent magnet for a long time under low-temperature condition
Ceramics coil resistant to high temperature, it is ensured that electromagnet ultrasonic changer provided by the invention can be detected at high temperature for a long time,
Realize the online ultrasonic non-destructive inspection techniques of high temperature metallic material and equipment.
In addition, due to the presence of permanent magnet, when electromagnetic acoustic test object is ferrimagnet, energy converter and measured object
A biggish magnetive attraction can be generated between body, being easy to abrasion in mobile energy converter, it is received and excitation variable winding component.When
Preceding involved patented technology is generally used adds protective case or retarder component and testee surface outside its coil block
The distance between, the technology can all increase the lift-off of transducer winding component away from so that the transducing of extreme influence energy converter is imitated
Rate.The utility model, which sprays ultra-thin (0.5mm) high temperature resistant and wear-resistant coating simultaneously at coil contact surface end, ensure that its minimum
Lift off makes coil block that can also guarantee its high conversion efficiency while from abrasion.
Above-described embodiment is only to clearly demonstrate examples for clearly illustrating the present invention, rather than the restriction to embodiment.
For those of ordinary skill in the art, other various forms of variations can also be made on the basis of the above description
Or it changes.Here without can not be also exhaustive to all embodiments.And the obvious variation thus amplified out
Or it changes among still in the protection scope of the utility model.
Claims (10)
1. a kind of resistant to high temperatures, wear-resisting electromagnetic acoustic shear wave transducer characterized by comprising
Shell, inside are formed with closed accommodating chamber；
Permanent magnet is housed in the accommodating chamber；
Excitation/receiving coil, is encapsulated in the wall surface of shell and towards permanent magnet；
The side wall of the accommodating chamber is equipped with cooling medium entrance and cooling medium exports, the cooling medium entrance and cooling Jie
Matter outlet is connected to external cooling source, the lower end surface of the excitation/receiving coil and the floor detection of ultrasonic shear waves energy converter
Face is concordant, and the wearing layer of 0.4-0.6mm thickness is coated in the detection faces.
2. electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting according to claim 1, it is characterised in that: the permanent magnetism
Iron is vacantly arranged in the accommodating chamber.
3. electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting according to claim 2, it is characterised in that: the shell
It is cylindrical, it is made of hollow cylinder and the end cap for being sealingly disposed in hollow cylinder both ends.
4. electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting according to claim 3, it is characterised in that: the end cap
It is lined with copper foil between hollow cylinder, sealing element is equipped between the copper foil and the hollow cylinder.
5. electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting according to claim 4, it is characterised in that: described hollow
The end face at cylinder both ends is equipped with the annular groove for being suitable for sealing element installation.
6. electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting according to claim 3, it is characterised in that: described hollow
Sealing is through equipped with the supporting element for being used to support permanent magnet on the side wall of cylinder.
7. electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting according to claim 3, it is characterised in that: the permanent magnetism
Iron is cylindrical and axis is overlapped with the central axes of the excitation/receiving coil.
8. electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting according to claim 7, it is characterised in that: the excitation/
Receiving coil is flat refractory ceramics spiral winding.
9. according to the described in any item electromagnetic acoustic shear wave transducers resistant to high temperatures, wear-resisting of claim 3-8, it is characterised in that:
Installation through-hole is equipped in the end cap below hollow cylinder, the excitation/receiving coil is horizontally placed on the installation through-hole
In and by multi-layer high-temperature ceramics glue-line encapsulate, the refractory ceramics glue-line of top layer and the upper surface of corresponding end cap are concordant.
10. electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting according to claim 9, it is characterised in that: be equipped with sharp
The two sidewalls of hair/receiving coil end cap are equipped with the through-hole installed for connecting wire, and the excitation/receiving coil passes through described
Connecting wire and external signal fittings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821386978.6U CN208721620U (en) | 2018-08-27 | 2018-08-27 | A kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821386978.6U CN208721620U (en) | 2018-08-27 | 2018-08-27 | A kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting |
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| Publication Number | Publication Date |
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| CN208721620U true CN208721620U (en) | 2019-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821386978.6U Active CN208721620U (en) | 2018-08-27 | 2018-08-27 | A kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872401A (en) * | 2018-08-27 | 2018-11-23 | 中南大学 | A kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting and preparation method thereof |
| CN110043810A (en) * | 2019-05-23 | 2019-07-23 | 山东省科学院激光研究所 | Detection method, the packaging method of sensor and sensor of defect of pipeline |
| CN114371221A (en) * | 2022-01-10 | 2022-04-19 | 哈尔滨工业大学 | Electromagnetic ultrasonic transducer with ultra-high temperature resistant double-coil structure |
-
2018
- 2018-08-27 CN CN201821386978.6U patent/CN208721620U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872401A (en) * | 2018-08-27 | 2018-11-23 | 中南大学 | A kind of electromagnetic acoustic shear wave transducer resistant to high temperatures, wear-resisting and preparation method thereof |
| CN110043810A (en) * | 2019-05-23 | 2019-07-23 | 山东省科学院激光研究所 | Detection method, the packaging method of sensor and sensor of defect of pipeline |
| CN114371221A (en) * | 2022-01-10 | 2022-04-19 | 哈尔滨工业大学 | Electromagnetic ultrasonic transducer with ultra-high temperature resistant double-coil structure |
| CN114371221B (en) * | 2022-01-10 | 2023-10-03 | 哈尔滨工业大学 | Electromagnetic ultrasonic transducer with ultra-high temperature resistant double-coil structure |
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