CN107063583A - The acoustic emission detection system and method for a kind of valve leak - Google Patents
The acoustic emission detection system and method for a kind of valve leak Download PDFInfo
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- CN107063583A CN107063583A CN201710263488.0A CN201710263488A CN107063583A CN 107063583 A CN107063583 A CN 107063583A CN 201710263488 A CN201710263488 A CN 201710263488A CN 107063583 A CN107063583 A CN 107063583A
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- 238000001514 detection method Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000011088 calibration curve Methods 0.000 claims abstract description 10
- 238000007689 inspection Methods 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000010606 normalization Methods 0.000 claims 1
- 238000010183 spectrum analysis Methods 0.000 claims 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013028 emission testing Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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- 201000001371 inclusion conjunctivitis Diseases 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 206010044325 trachoma Diseases 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to a kind of acoustic emission detection system of valve leak and method, including acoustic emission sensor and main frame, the main frame includes filtration module, analog-to-digital conversion module, signal processing module, processor module and FFT module, the acoustic emission signal received is converted to electric signal by the acoustic emission sensor, and sends main frame to after carrying out enhanced processing；Filtering, analog-to-digital conversion, FFT processing are completed in the main frame, finally judges that valve whether there is the result of leakage problem by the processor module；The main frame also includes alarm module, and when the processor module judges that valve has leakage, the alarm module can send prompt messages；The device is simple to operate, can one-key operation leak detection, while subsidiary warning function, small volume facilitates operating personnel to carry to live inspection, and correspondence calibration curve, raising detection efficiency can be recalled for variety classes valve.
Description
Technical field
The present invention relates to acoustic emission testing technology field, and in particular to a kind of acoustic emission detection system of valve leak and side
Method.
Background technology
Valve has extensively as a kind of spare part in common use industrial goods in the industry such as machinery, metallurgy, petrochemical industry, chemical industry, urban construction
General application, the valve on gas-liquid pipeline will bear high temperature and high pressure mostly, if valve leak, can not only produce energy
Amount loss, causes pipeline operation troubles, and the safety of equipment and personnel are threatened.Valve leak is detected, with
Understand the degree of leakage and safeguard in time, be that the operation of pipeline safely provides guarantee.
The leakage of valve generally occurs in the closing face of valve opening and closing, the sealing position of valve rod, valve junction and valve
The part breakage such as body, is commonly divided into leakage and interior two kinds of leakage, interior leakage is referred to because the reasons such as the erosive wear of medium make
Obtain valve to be not closed completely, even if valve leading screw is screwed in place, due to still there is gap between valve element and valve body, medium can also flow
Past；Leakage refer between valve and adpting flange or connection screw thread it is poorly sealed cause medium outflow connection sealing surface, or
Person be it is poorly sealed between the gland of pressure-conducting disk root on valve rod and valve rod caused by dielectric leakage, or there is trachoma to lead on valve body blank
The external leakage of cause.
Continuous acoustic emission signal can be produced during valve leak, the acoustic emission signal and leakage rate positive correlation, description are continuous
The major parameter of type acoustic emission signal includes RMS voltage (RMS) and average signal level (ASL), can use at present general
Type Acoustic radiating instrument gathers signal and carries out usually requiring arrangement probe and preamplifier in leakage analyzing, test process, and
Acoustic radiating instrument needs external power supply to power it, and data analysis with alarm is realized in host computer, and complete equipment is more numerous
It is trivial, and the process of arrangement probe and mobile host computer can seriously reduce detection efficiency, therefore be inconvenient to be applied to the big quantity of inspection
Valve.
The content of the invention
In view of this, it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of sound emission of valve leak
Detection means and method, the device volume are compact, hand-holdable, while built-in leakage demarcation and warning function, can be carried to scene
One is rapidly completed detection.
To realize object above, the present invention is adopted the following technical scheme that, a kind of acoustic emission detection system of valve leak, bag
Acoustic emission sensor and main frame are included, the main frame connects the acoustic emission sensor, and the acoustic emission sensor, which includes ceramics, to be protected
Bluff piece, piezoelectric ceramics and pre-amplification circuit, the acoustic emission sensor are coupled to valve surface to be measured, and the sound of valve leak is sent out
Penetrate signal and the piezoelectric ceramics is transferred to by the ceramic screening glass, the piezoelectric ceramics turns the acoustic emission signal received
Electric signal is changed to, and processing is amplified to electric signal by the pre-amplification circuit；
The main frame include filtration module, analog-to-digital conversion module, signal processing module, processor module, FFT module, only
Read memory, random access memory and shell；Wherein, the input of the filtration module and the pre-amplification circuit is defeated
Go out end to be connected, the output end of the filtration module is connected with the input of the analog-to-digital conversion module；The analog-to-digital conversion module
Output end connect the input of the FFT module, the analog-to-digital conversion module is also connected with signal processing module, the signal
The data signal sampled and receive analog-to-digital conversion module output of processing module control analog-to-digital conversion module, the signal transacting
The output end of module is also connected with the processor module, the processor module connect respectively the FFT module output end,
Read-only storage and random access memory.
Preferably, the main frame also includes alarm module, and the alarm module is connected with the processor module.
Preferably, buzzer and/or flashing indicator light are provided with the alarm module.
Preferably, keyboard and display module are additionally provided with the main frame surface, the keyboard is used to test, demarcate and input
The data of setting, the display module is used to show the parameter and test result set.
Preferably, power supply module is additionally provided with inside the main frame, the power supply module is in main frame harmony emission sensor
Pre-amplification circuit power.
Preferably, the power supply module is replaceable disposable battery, to ensure continuous Site Detection.
Preferably, the filtration module is analog filter block.
Preferably, the acoustic emission sensor also includes metal shell, and the metal shell can shield outer signals and make an uproar
Sound.
Preferably, the preservation of the complete pairwise testing of the read-only storage and nominal data, the random access memory is matched somebody with somebody
The processor module is closed to complete to access ephemeral data in program operation, acoustic emission parameters generation, calibration curve generation processing.
Present invention also offers a kind of method that valve detection is carried out using the acoustic emission detection system, its process step
It is as follows：
A. the acoustic emission sensor of detection means is coupling in tested valve surface；
B. tested valve type number is pre-selected inside detection means, presses measurement key collection fixed length signal, passes through FFT spectrograms point
Analysis obtains tested valve leakage signal frequency range, and detection means sets sample rate according to test case and selects suitable filtering
Device；
C. valve leak calibration process：Manual control valve leak sizes, while external flowmeter quantificational expression leakage rate,
The leakage value measured in detection means calibration interface input flow rate, presses measurement key and obtains corresponding acoustic emission parameters, detect
One group of calibration point of generation inside device, multigroup calibration point can be obtained and thus generate calibration curve by repeating said process, be used for
Later leakage is detected；
D. when only needing to qualitative detection valve and whether leaking, it can select to skip calibration process, directly to being tested valve
Tested, now device only shows acoustic emission parameters without leakage rate reference value；
F. according to step c and two kinds of different situations of step d, it can select as alarm to be become with leakage rate or acoustic emission parameters
Amount, preset threshold value, when the valve alarm variate-value measured by detection means exceedes correspondence alarm threshold value, detection means can
Valve leak is tested by buzzing and/or indicator lamp flash for prompting.
Preferably, the acoustic emission parameters are acoustic emission signal RMS voltage and average signal level.
The present invention uses above technical scheme, and the acoustic emission detection system includes acoustic emission sensor and main frame, described
Main frame includes filtration module, analog-to-digital conversion module and FFT module；Wherein, according to acoustic emission signal, module, modulus turn after filtering
Change the mold after block and FFT module processing, it is possible to decrease interference of the noise to acoustic emission signal, improve detection accuracy；The main frame is also
Including alarm module, when leakage rate, RMS or ASL numerical value exceed preset alarm line, the current valve of alarm module alarm
Door leakage；The device is simple to operate, can one-key operation leak detection, while subsidiary warning function, small volume facilitates operating personnel
Carry to live inspection, and correspondence calibration curve can be recalled for variety classes valve, improve detection efficiency.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the acoustic emission detection method of valve leak of the present invention；
Fig. 2 is the structural representation of the acoustic emission detection system of valve leak of the present invention.
In figure：1st, acoustic emission sensor；2nd, main frame；3rd, ceramic screening glass；4th, piezoelectric ceramics；5th, pre-amplification circuit；6、
Filtration module；7th, analog-to-digital conversion module；8th, signal processing module；9th, processor module；10th, FFT module；11st, read-only storage；
12nd, random access memory；13rd, shell；14th, alarm module；15th, keyboard；16th, display module；17th, power supply module；18th, metal
Shell.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical scheme will be carried out below
Detailed description.Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are resulting on the premise of creative work is not made to be owned
Other embodiment, belongs to the scope that the present invention is protected.
As shown in figure 1, the invention provides a kind of acoustic emission detection method of valve leak, its specific process step is such as
Under：
A. detection means opening initialization；
B. the configuration before being shut down using last time is chosen whether, if selection "No" jumps to step c, if selection "Yes" is needed
Continue to choose whether using existing calibration curve, if selection "No" jumps to step f, if selection is to jump to step；
C. valve type number is selected, acoustic emission sensor 1 is then coupled to flat place around tested valve, to being tested valve
Carry out signal acquisition；
D. according to the acoustic emission waveform signal generation FFT spectrograms collected, signal frequency range is determined by FFT spectrograms,
And select the wave filter of corresponding frequency band；
E. choose whether to carry out leakage rate demarcation, if selection "Yes" jumps to step f, if selection "No" jumps to step
Rapid j；
F. from correspondence model valve, external flowmeter, manual rotation, which is tested valve, makes valve be a certain steady by flow
Definite value；
G. detection means calibration interface input present flow rate value, click on test, generation correspondence acoustic emission parameters (RMS and
ASL), one group of calibration point is obtained；
H. choose whether to terminate leakage rate demarcation, if selection "Yes", detection means automatically generates calibration curve and redirected
To step i, if selection "No" jumps to step f；
I. valve is tested, the corresponding leakage rate of acoustic emission parameters is obtained, using leakage rate as criterion variable, works as measurement
Leakage rate exceed preset alarm threshold value when, alarm module 14 sends prompt messages；
J. valve is tested, acoustic emission parameters are obtained, using acoustic emission parameters as criterion variable, when the acoustic emission parameters of measurement
During more than preset alarm threshold value, alarm module 14 sends prompt messages.
It should be added that, the generation of calibration curve described in step h needs at least two groups calibration points, calibration point quantity
Leakage rate reference value obtained by more is more accurate.Tested valve leak of the present invention is that valve gas is leaked or liquid is let out
Leakage.
As shown in Fig. 2 present invention also offers a kind of acoustic emission detection system of valve leak, including acoustic emission sensor
1 and main frame 2, the main frame 2 connects the acoustic emission sensor 1, and the acoustic emission sensor 1 includes ceramic screening glass 3, piezoelectricity
Ceramics 4 and pre-amplification circuit 5, the acoustic emission sensor 1 are coupled to valve surface to be measured, the acoustic emission signal of valve leak
The piezoelectric ceramics 4 is transferred to by the ceramic screening glass 3, the piezoelectric ceramics 4 changes the acoustic emission signal received
For electric signal, and processing is amplified to electric signal by the pre-amplification circuit 5；
The main frame 2 includes filtration module 6, analog-to-digital conversion module 7, signal processing module 8, processor module 9, FFT moulds
Block 10, read-only storage 11, random access memory 12 and shell 13；Wherein, the input of the filtration module 6 with it is described before
The output end for putting amplifying circuit 5 is connected, and the output end of the filtration module 6 is connected with the input of the analog-to-digital conversion module 7；
The output end of the analog-to-digital conversion module 7 connects the input of the FFT module 10, and the analog-to-digital conversion module 7 is gone back and signal
Processing module 8 is connected, the sampling of the signal processing module 8 control analog-to-digital conversion module 7 and to receive analog-to-digital conversion module 7 defeated
The data signal gone out, the output end of the signal processing module 8 is also connected with the processor module 9, the processor module 9
Output end, read-only storage 11 and the random access memory 12 of the FFT module 10 are connected respectively.
Further, the main frame 2 also includes alarm module 14, and the alarm module 14 connects with the processor module 9
Connect.
It is understood that being provided with buzzer and/or flashing indicator light in the alarm module 14, alarm module 14 passes through
Buzzer sounding and/or indicator lamp do not stop the form of flicker to send prompt messages.
It should be added that, keyboard 15 and display module 16 are additionally provided with the surface of main frame 2, the keyboard 15 is used
The data set in test, demarcation and input, the display module 16 is used to show the parameter and test result set.
Need further to remark additionally, power supply module 17 is additionally provided with inside the main frame 2, the power supply module 17 is
Pre-amplification circuit 5 in main frame 2 and acoustic emission sensor 1 is powered, and the power supply module 17 is replaceable disposable battery,
To ensure continuous Site Detection.
Preferably, the filtration module 6 is analog filter block.
In addition, the acoustic emission sensor 1 also includes metal shell 18, the metal shell 18 can shield outer signals
Noise.
Specifically, the preservation of the complete pairwise testing of the read-only storage 11 and nominal data, the random access memory
12 coordinate the completion program of processor module 9 operation, acoustic emission parameters generation, calibration curve generation to access nonce in handling
According to.
The present invention uses above technical scheme, and the acoustic emission detection system is simple to operate, can one-key operation valve leak
Detection, while subsidiary warning function；Small volume, facilitates operating personnel to carry to live inspection；It can be adjusted for variety classes valve
Go out correspondence calibration curve, improve detection efficiency.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of acoustic emission detection system of valve leak, it is characterised in that including acoustic emission sensor and main frame, the main frame
The acoustic emission sensor is connected, the acoustic emission sensor includes ceramic screening glass, piezoelectric ceramics and pre-amplification circuit, institute
Acoustic emission sensor is stated coupled to valve surface to be measured, the acoustic emission signal of valve leak is transferred to by the ceramic screening glass
The acoustic emission signal received is converted to electric signal by the piezoelectric ceramics, the piezoelectric ceramics, and passes through the preposition amplification
Circuit is amplified processing to electric signal；
The main frame includes filtration module, analog-to-digital conversion module, signal processing module, processor module, FFT module, read-only deposited
Reservoir, random access memory and shell；Wherein, the output end of the input of the filtration module and the pre-amplification circuit
It is connected, the output end of the filtration module is connected with the input of the analog-to-digital conversion module；The analog-to-digital conversion module it is defeated
Go out the input of the end connection FFT module, the analog-to-digital conversion module is also connected with signal processing module, the signal transacting
The data signal sampled and receive analog-to-digital conversion module output of module control analog-to-digital conversion module, the signal processing module
Output end be also connected with the processor module, the processor module connects the output end, read-only of the FFT module respectively
Memory and random access memory.
2. acoustic emission detection system according to claim 1, it is characterised in that the main frame also includes alarm module, institute
Alarm module is stated to be connected with the processor module.
3. acoustic emission detection system according to claim 2, it is characterised in that buzzer is provided with the alarm module
And/or flashing indicator light.
4. the acoustic emission detection system according to any one of claims 1 to 3, it is characterised in that on the main frame surface also
Provided with keyboard and display module, the keyboard is used to testing, demarcate and inputting the data set, and the display module is used to show
The parameter and test result of setting.
5. the acoustic emission detection system according to any one of claims 1 to 3, it is characterised in that also set inside the main frame
There is power supply module, the power supply module is that the pre-amplification circuit in main frame harmony emission sensor is powered.
6. acoustic emission detection system according to claim 5, it is characterised in that the power supply module for it is replaceable once
Property battery, to ensure continuous Site Detection.
7. the acoustic emission detection system according to any one of claims 1 to 3, it is characterised in that the filtration module is mould
Intend filtration module.
8. the acoustic emission detection system according to any one of claims 1 to 3, it is characterised in that the acoustic emission sensor
Also include metal shell, the metal shell can shield outer signals noise.
9. a kind of usage right requires the method that the device described in 1 to 3 any one carries out valve leak acoustic emission detection, its feature
It is, methods described step is as follows：
A. the acoustic emission sensor of detection means is coupling in tested valve surface；
B. tested valve type number is pre-selected inside detection means, presses measurement key collection fixed length signal, is obtained by FFT spectrum analysis
To tested valve leakage signal frequency range, detection means sets sample rate according to test case and selects suitable wave filter；
C. valve leak calibration process：Manual control valve leak sizes, while external flowmeter quantificational expression leakage rate, in inspection
The leakage value that device normalization interface input flow rate is measured is surveyed, measurement key is pressed and obtains corresponding acoustic emission parameters, detection means
One group of calibration point of inside generation, multigroup calibration point can be obtained and thus generate calibration curve by repeating said process, for follow-up
Leak detection；
D. it when only needing to qualitative detection valve and whether leaking, can select to skip calibration process, directly tested valve is carried out
Test, now device only shows acoustic emission parameters without leakage rate reference value；
F. according to step c and two kinds of different situations of step d, it can select with leakage rate or acoustic emission parameters as alarm variable,
Preset threshold value, when the valve alarm variate-value measured by detection means exceedes correspondence alarm threshold value, detection means can lead to
Cross buzzing and/or indicator lamp flash for prompting is tested valve leak.
10. the acoustic emission detection method of valve leak according to claim 9, it is characterised in that：The acoustic emission parameters are
Acoustic emission signal RMS voltage and average signal level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710263488.0A CN107063583A (en) | 2017-04-20 | 2017-04-20 | The acoustic emission detection system and method for a kind of valve leak |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710263488.0A CN107063583A (en) | 2017-04-20 | 2017-04-20 | The acoustic emission detection system and method for a kind of valve leak |
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Family
ID=59600904
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| CN201710263488.0A Pending CN107063583A (en) | 2017-04-20 | 2017-04-20 | The acoustic emission detection system and method for a kind of valve leak |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109194412A (en) * | 2018-11-15 | 2019-01-11 | 清诚声发射研究（广州）有限公司 | A kind of acoustic emission monitor(ing) warning device, system and method |
| CN109668055A (en) * | 2018-11-16 | 2019-04-23 | 江苏微优软件科技有限公司 | A kind of remote online valve leaks monitoring device and its working method |
| CN110726518A (en) * | 2019-10-24 | 2020-01-24 | 中国核动力研究设计院 | Positioning and monitoring system for leakage of annular sealing surface of nuclear reactor pressure vessel |
| CN111157185A (en) * | 2018-11-08 | 2020-05-15 | 中国石油化工股份有限公司 | Air tightness detection device and air tightness detection method for emergency cut-off valve |
| CN112012984A (en) * | 2020-09-21 | 2020-12-01 | 中国人民解放军海军工程大学 | Hydraulic slide valve internal leakage acoustic emission detection experimental device and using method thereof |
| CN114151737A (en) * | 2021-12-08 | 2022-03-08 | 天津大学 | Spherical internal detector and positioning system for pipeline leakage detection |
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| CN111157185A (en) * | 2018-11-08 | 2020-05-15 | 中国石油化工股份有限公司 | Air tightness detection device and air tightness detection method for emergency cut-off valve |
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| CN112012984A (en) * | 2020-09-21 | 2020-12-01 | 中国人民解放军海军工程大学 | Hydraulic slide valve internal leakage acoustic emission detection experimental device and using method thereof |
| CN114151737A (en) * | 2021-12-08 | 2022-03-08 | 天津大学 | Spherical internal detector and positioning system for pipeline leakage detection |
| CN114151737B (en) * | 2021-12-08 | 2024-05-24 | 天津大学 | Spherical inner detector for pipeline leakage detection and positioning system |
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Application publication date: 20170818 |
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