CN202126334U

CN202126334U - Valve leakage detecting device

Info

Publication number: CN202126334U
Application number: CN2011201740486U
Authority: CN
Inventors: 邓友成; 肖忠良
Original assignee: HUNAN HONGYUAN HIGH-PRESSURE VALVES Co Ltd; Changsha University of Science and Technology
Current assignee: HUNAN HONGYUAN HIGH-PRESSURE VALVES Co Ltd; Changsha University of Science and Technology
Priority date: 2011-05-27
Filing date: 2011-05-27
Publication date: 2012-01-25
Anticipated expiration: 2021-05-27

Abstract

The utility model discloses a valve leakage detecting device, comprising an acoustic sensor, a first signal processor, a first A/D (Analog to Digital) converter, a fast Fourier converter and an analyzer; the acoustic sensor movably contacts with the valve; the first signal processor is connected with the acoustic sensor and comprises a band filter circuit connected with the acoustic sensor and an amplifier circuit connected with the band filter circuit; the first A/D converter is connected with the first signal processor; the fast Fourier converter is connected with the first A/D converter; and the analyzer is connected with the fast Fourier converter. The analyzer provided by the utility model is used for introducing a wave form drawn out by a data file when no leakage occurs, comparing the detected frequency spectrogram with the wave form stored in the analyzer and drawn out by the data file when no leakage occurs, and judging whether the detected valve is leaked in combination with the conditions required when there is a leak. The valve leakage detecting device disclosed by the utility model can be used for judging whether there is a leak without depending on human's intuitive judgment, and the precision of the judgment is improved.

Description

A kind of valve leak pick-up unit

Technical field

The utility model relates to valve leak checkout equipment technical field, particularly a kind of valve leak pick-up unit.

Background technology

Valve is high pressure valve especially; As a kind of general engineering goods, be widely used in the every field of national economy, because often the contact chemicals has very high pressure again; The long-time phenomenon that has leakage of using of these valves takes place, and its security is the focus that people pay close attention to always.The main type of valve leak be divided into leak outside with interior leakage; And general difficult discovery of the interior leakage of valve, but the safe operation to valve produces significant impact, is prone to cause the serious accident of burst; Contaminated like actuating medium, some fire explosion, intoxication accident are all caused by valves leakage.

The detection of valve internal leakage still lacks effective means, relies on people's sense organ and experience more, judges the foundation of the lack of scientific of getting up; Comparatively effective gas, leak of liquid detector adopt converter technique to change the signal that can hear for people's ear to ultrasonic signal more, after amplifying, adopt the mode of headphone monitor; By the testing staff according to the voice signal of hearing to have that it's too late strong and weak, whether identification leaks and the size of leakage rate, the auxiliary intensity that adopts light emitting diode to show leakage signal roughly; But because the environment for use more complicated of high pressure valve, background interference is ever-changing, and stronger ground unrest is often arranged; Only listen with ear; Observe the demonstration of diode and often can't make accurate judgement, the error in judgement rate is big, up to the present; Judgement to high pressure valve leaks does not especially still have effective detection means to the judgement of leaking in it.Present leakage detector must judge and bring big artificial error that the error in judgement rate is high by the people.

Therefore, how reducing artificial judgement and bring bigger personal error, improve and judge degree of accuracy, is those skilled in the art's problem demanding prompt solutions.

The utility model content

In view of this, the utility model provides a kind of valve leak pick-up unit, brings bigger personal error to reduce artificial judgement, improves and judges degree of accuracy.

For realizing above-mentioned purpose, the utility model provides following technical scheme:

A kind of valve leak pick-up unit comprises:

The removable acoustic sensor that contacts with valve;

First signal processor that links to each other with said acoustic sensor, it comprises bandwidth-limited circuit that links to each other with said acoustic sensor and the amplifying circuit that links to each other with this bandwidth-limited circuit;

First A/D converter that links to each other with said first signal processor;

The fast Fourier transformer that links to each other with said first A/D converter;

The analyser that links to each other with said fast Fourier transformer.

Preferably, in above-mentioned valve leak pick-up unit, the power supply of this valve leak pick-up unit is split type charge power supply or high-energy battery.

Preferably, in above-mentioned valve leak pick-up unit, also comprise:

Be arranged on the temperature sensor on the valve;

The secondary signal processor that links to each other with said temperature sensor, it comprises the amplifying circuit that links to each other with said temperature sensor;

With second A/D converter that said secondary signal processor links to each other, this second A/D converter links to each other with said analyser.

Preferably, in above-mentioned valve leak pick-up unit, be connected with the waveform amplification module between said fast Fourier transformer and said first A/D converter.

Preferably, in above-mentioned valve leak pick-up unit, said analyser is provided with display analysis result's display.

Preferably, in above-mentioned valve leak pick-up unit, said acoustic sensor is a plurality of, and is separately positioned on the test point of diverse location.

Preferably, in above-mentioned valve leak pick-up unit, said temperature sensor is a plurality of, and is separately positioned on the test point of diverse location.

Can find out from above-mentioned technical scheme; The valve leak pick-up unit that the utility model provides; During detection, the Acoustic Leak signal changes electric signal into through the acoustic sensor collection, through the bandwidth-limited circuit and the amplifying circuit of first signal processor; Electric signal is carried out filtering and amplification, flow to fast Fourier transformer through first A/D converter then.The signal of above-mentioned warp first A/D converter conversion is by computer recording, and saves as data file.Fast Fourier transformer is carried out fast Fourier to data and is changed, and the corresponding spectrogram that draws provides visual waveform, spectrum analysis, and through analyser this spectrogram analyzed, and makes judgement to whether leaking.The waveform that data file when analyser has been introduced other and do not leaked is drawn; And the waveform that the data file when this is detected not leaking of preserving in spectrogram and the analyser is drawn carries out reference; Required condition when revealing judges whether the valve that this time detects is revealed.The utility model does not rely on people's intuitive judgment, can make judgement to whether leaking yet, and has improved the degree of accuracy of judging.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

The structural representation of the valve leak pick-up unit that Fig. 1 the utility model embodiment provides;

The test point that Fig. 2 provides for the utility model embodiment choose structural representation.

Embodiment

The utility model discloses a kind of valve leak pick-up unit, bring bigger personal error, improve and judge degree of accuracy to reduce artificial judgement.

To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.

See also Fig. 1 and Fig. 2, the structural representation of the valve leak pick-up unit that Fig. 1 the utility model embodiment provides; The test point that Fig. 2 provides for the utility model embodiment choose structural representation.

The valve leak pick-up unit that the utility model provides comprises acoustic sensor 21, first signal processor 22, first A/D converter 23, fast Fourier transformer 3 and analyser 4.Wherein, acoustic sensor 21 movably is arranged on the valve, for example can place the valve preceding pipeline respectively, and valve body on the pipeline, is used to obtain the Acoustic Leak signal of valve behind the valve.First signal processor 22 links to each other with acoustic sensor 21; Be used for acoustic sensor 21 detected Acoustic Leak signals are handled; First signal processor 22 comprises bandwidth-limited circuit that links to each other with acoustic sensor 21 and the amplifying circuit that links to each other with this bandwidth-limited circuit; So that acoustic sensor 21 detected Acoustic Leak signals are carried out filtering and amplification, with the interference of elimination ground unrest.First A/D converter 23 links to each other with first signal processor 22, and being used for the Acoustic Leak conversion of signals after filtering and the amplification is digital signal, saves as data file after conversion finishes, and this data file can be saved on computing machine or other external moving equipment.Fast Fourier transformer 3 links to each other with first A/D converter 23, is used for the data file of above-mentioned preservation is carried out Fast Fourier Transform (FFT), converts time-domain signal into frequency-region signal, and the corresponding spectrogram that draws.Whether analyser 4 links to each other with fast Fourier transformer 3, and analyser 4 is used for the spectrogram that forms after the Fast Fourier Transform (FFT), and the spectrogram when not leaking with the valve of its internal reservoir compares, and judge this valve and leak.

Analyser 4 can be introduced the acoustic signal waveform that other data file (being the data file that valve obtains when not leaking) is drawn in advance.The different medium of this acoustic signal waveform (spectrogram when not leaking) for obtaining with repetition test, different leak rates, the test figure of the valve of difformity and model is set up model through methods such as SVMs and artificial intelligence.Whether this model just is the model of detected spectrogram reference, compares through detecting the spectrogram and this model that obtain, judge the valve that this time detects and leak, and basis for estimation can be imported in the analyser 4 in advance.

The valve leak pick-up unit that the utility model provides; During detection; The Acoustic Leak signal is gathered through acoustic sensor 21 and is changed electric signal into; Bandwidth-limited circuit and amplifying circuit through first signal processor 22 carry out filtering and amplification to electric signal, flow to fast Fourier transformer 3 through first A/D converter 23 then.The signal of above-mentioned warp first A/D converter 23 conversions is by computer recording, and saves as data file.3 pairs of data of fast Fourier transformer are carried out fast Fourier and are changed, and the corresponding spectrogram that draws provides visual waveform, spectrum analysis, and analyzes through 4 pairs of these spectrograms of analyser, make judgement to whether leaking.The waveform that data file when analyser 4 has been introduced other and do not leaked is drawn; And the waveform that the data file when this is detected in spectrogram and the analyser 4 not leaking of preserving is drawn carries out reference; Required condition when revealing judges whether valve is revealed when this time detecting.The utility model does not rely on people's intuitive judgment, can make judgement to whether leaking yet, and has improved the degree of accuracy of judging.

The power supply of the valve leak pick-up unit that the utility model provides is split type charge power supply or high-energy battery.Because valve is different when the temperature of leaking when not leaking, so the utility model also can comprise temperature sensor 11, secondary signal processor 12 and second A/D converter 13.Wherein, temperature sensor 11 is arranged on the valve, is used to obtain the temperature signal of valve.Secondary signal processor 12 links to each other with temperature sensor 11, is used for temperature sensor 11 detected temperature signals are handled, and it comprises the amplifying circuit that links to each other with temperature sensor 11, is used for temperature signal is amplified.Second A/D converter 13 links to each other with secondary signal processor 12, is used for converting the temperature signal after amplifying into digital signal, saves as the temperature data file after conversion finishes, and this temperature data file can be saved on computing machine or other external moving equipment.Second A/D converter 13 links to each other with analyzer 4; Analyzer 4 is used for the temperature data file of above-mentioned preservation is handled; With the frequency-region signal that is converted to through fast Fourier transformer 3; Set up out model through SVMs and artificial intelligence approach, the spectrum information and the temperature information that store in advance in the binding analysis device 4 are made judgement to whether leaking.

Between the acoustic sensor 21 and first A/D converter 23, be connected with the waveform amplification module between the temperature sensor 11 and second A/D converter 13., and waveform amplified the data file waveform that draws through this waveform amplification module.In particular, be arranged between the fast Fourier transformer 3 and first A/D converter 23 to the waveform amplification module of acoustic sensor 21, and link to each other with the two respectively.

Analyser 4 is provided with display analysis result's display, through this display can demonstrate this time detect with analyser in result after the spectral model contrast when not leaking of the valve set up in advance.Acoustic sensor 21 is with temperature sensor 11 and is arranged on a plurality of of different test points.Be that temperature sensor 11 is a plurality of, and a plurality of temperature sensor 11 is separately positioned on the different test points.Acoustic sensor 21 is a plurality of, and a plurality of acoustic sensor 21 is separately positioned on the different test points.For example can be respectively before the inlet of valve behind 0.5m place, valve body and the valve export pipeline at 0.5m place (110) surface select test point; The test point at 0.5m place is first test point 102 before the inlet of valve in the present embodiment; The test point at 0.5m place is second test point 103 after the outlet of valve, and the test point on the valve body is the 3rd test point 101.Also can select the test point of greater number, but test point will be near the valve body setting, or be set directly on the valve body.

Acoustic sensor

21 and 11 two sensors of temperature sensor can be set, with acoustic signal and the temperature signal that detects this test point simultaneously respectively on a test point.General pipeline outside is equipped with insulating 110, need pass insulating with sensor to the pipeline that insulating is arranged, with the temperature or the acoustic signal of direct detection pipeline.

In sum, the integrated degree of the utility model is high, volume is little, and the operator is detected in hand held easily; Adopt acoustic conducting pipe that the function that intercepts thermal radiation is arranged; Through model intelligence background correction interference of noise, combine temperature model simultaneously, thereby can under strong background noise, effectively detect without interruption.The utility model is specially adapted to the high-temperature high pressure valve internal leakage detection that heat power plant boiler, steam turbine and chemical process are used.

Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.

To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the utility model or scope in other embodiments among this paper.Therefore, the utility model will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.

Claims

1. a valve leak pick-up unit is characterized in that, comprising:

The acoustic sensor that movably contacts (21) with valve;

First signal processor (22) that links to each other with said acoustic sensor (21), it comprises bandwidth-limited circuit that links to each other with said acoustic sensor (21) and the amplifying circuit that links to each other with this bandwidth-limited circuit;

First A/D converter (23) that links to each other with said first signal processor (22);

The fast Fourier transformer (3) that links to each other with said first A/D converter (23);

The analyser (4) that links to each other with said fast Fourier transformer (3).

2. valve leak pick-up unit as claimed in claim 1 is characterized in that, the power supply of this valve leak pick-up unit is split type charge power supply or high-energy battery.

3. valve leak pick-up unit as claimed in claim 1 is characterized in that, also comprises:

Be arranged on the temperature sensor (11) on the valve;

The secondary signal processor (12) that links to each other with said temperature sensor (11), it comprises the amplifying circuit that links to each other with said temperature sensor (11);

Second A/D converter (13) that links to each other with said secondary signal processor (12), this second A/D converter (13) links to each other with said analyser (4).

4. valve leak pick-up unit as claimed in claim 3 is characterized in that, is connected with the waveform amplification module between said fast Fourier transformer (3) and said first A/D converter (23).

5. valve leak pick-up unit as claimed in claim 1 is characterized in that, said analyser (4) is provided with display analysis result's display.

6. like each described valve leak pick-up unit of claim 1-5, it is characterized in that said acoustic sensor (21) is a plurality of, and is separately positioned on the test point of diverse location.

7. valve leak pick-up unit as claimed in claim 3 is characterized in that, said temperature sensor (11) is a plurality of, and is separately positioned on the test point of diverse location.