CN1645080A - Portable checker of pipeline leakage - Google Patents
Portable checker of pipeline leakage Download PDFInfo
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- CN1645080A CN1645080A CN 200510020194 CN200510020194A CN1645080A CN 1645080 A CN1645080 A CN 1645080A CN 200510020194 CN200510020194 CN 200510020194 CN 200510020194 A CN200510020194 A CN 200510020194A CN 1645080 A CN1645080 A CN 1645080A
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Abstract
A portable piping leakage detector is composed of host, USB concentrator, network concentrator, a numbers of data collection units and vibration transducer, temperature transducer and vibration exciting device and its host is connected to each data collection unit by USB concentrator and network concentrator. The detector can detect out leakage of piping for pressure fluid and call tell the exact position of leakage point.
Description
Technical field
The present invention relates to a kind of detecting instrument, especially relate to a kind of portable pipe leakage detector that the pressure fluid pipe network detects pipe leakage and accurately locatees leak source that is used for.
Background technology
In existing pressure fluid pipe network system, owing to third party's construction causes aging and extraneous traffic of burn into and building to existing pipeline destroyed, pipeline self overload pressure, sudden collision and the installation that pipeline produces do not met reasons such as standard code, cause leakage to happen occasionally.The leakage of various pipes has not only had a strong impact on fast development of national economy, brings great harm also for simultaneously human health, physical environment, social environment and piping system self.Therefore study the pipe leakage fault diagnosis technology, remarkable social benefit and economic benefit are arranged.Along with development and national economy, the laying of various pipelines more and more widely becomes increasingly complex, and its total trend is a large amount of the burying underground underground of pipeline, and is net distribution, and this has brought great difficulty just for the Leak Detection work of pipe network.
U.S.'s application for a patent for invention 5231866 disclosed leak detecting devices are in the leakage point both sides of pipeline vibration transducer to be set respectively, each sensor connects a data acquisition unit, data acquisition unit is transferred to main frame analysis by standard interfaces such as RS-232, RS-485 with image data, the location leak source.These standard interface communication speeds are the highest to be no more than 1Mbps, the wired connection distance is limited, and transmission medium often is subjected to the interference of electric field and magnetic field on every side.In order to increase transmission range, to reduce various interference, needing increases more circuit and equipment, has so both increased system cost, makes troubles to system maintenance again.
Chinese invention patent 96121000.1 discloses a kind of employing transient pressure ripple localization method, calculates the leak detecting device of leakage point position.This device adopts fuzzy and neural network method calibrating (base measuring) pressure wave velocity.At first need to set up the pipeline moving model in this way.The service condition difference of the pipeline under different distributions, the varying environment condition, model is also inequality.Set up model need by a large amount of, realize at the experimental implementation of determining pipeline; Complex distributions pipe network to the pipeline of different kind of material, size constitutes is difficult for setting up proper model.
U.S.'s application for a patent for invention 5922942 discloses a kind of leak detection system, and it comprises main collecting unit, attached collecting unit and three parts of sensor.Main collecting unit adopts microprocessor, except a transducing signal is gathered, also controls total system and finishes relevant data analysis processing.Microprocessor is special-purpose device, and its calculation function is limited, and the function expansion is also limited.Communicate by infrared mode between two collecting units.The infrared communication mode, communication speed is low, requires simultaneously must satisfy the specific relative position condition between communication two parts, as between two parts barrier not being arranged.
Summary of the invention
In order to overcome the shortcoming and defect of existing pipe leak detector, the invention provides a kind of portablely, can under various complex environments, detect, locate the conduit leakage detecting instrument of leakage.This device provides two kinds of interfaces of USB and network to be connected main frame and data acquisition unit, applicable to the off-line and the online detection of different application occasion, supports high speed data transfer; In order to improve the signal to noise ratio (S/N ratio) of acquired signal, with the reliability and the leakage positioning precision of final raising Leak Detection, programmable wave filter and amplifier are adopted in the front end signal conditioning.
The technical solution adopted for the present invention to solve the technical problems is: the portable pipe leakage detector, constitute by main frame, usb hub, several data acquisition units and vibration transducer, and main frame is connected with each data acquisition unit by usb hub; Each data acquisition unit connects a vibration transducer respectively.
Main frame can also be connected with each data acquisition unit by hub.Described data acquisition unit is made up of signal condition unit, A/D converter, microprocessor, USB interface, network interface, storer, clock source and rechargable power supplies; Signal condition unit, A/D converter, microprocessor are linked in sequence and are connected with rechargable power supplies respectively, and A/D converter also is connected with the clock source; Microprocessor also is connected with clock source, USB interface, network interface, storer respectively, and storer also is connected with rechargable power supplies.Described signal condition unit is made of programmable filter and programmable amplifier.Data acquisition unit can connect temperature sensor, and perhaps main frame can connect temperature sensor.This detector can also connect a vibrational excitation source by usb hub or hub by main frame, perhaps connects a vibrational excitation source by one of data acquisition unit; Vibrational excitation source front end also connects a Vib., Vib. on pipeline, be positioned over one of vibration transducer the next door or with its known position of distance.
The detection system that the present invention relates to provides USB interface and network interface between data acquisition unit and main frame.USB interface has that plug and play, speed are fast, transmission is reliable and can support advantage such as a plurality of external units simultaneously; Network technology then can satisfy long-range and high-speed communication simultaneously.Simultaneously, standard interface and main flow general-purpose interface that these two kinds of interfaces all are present multi-purpose computers, its parts have versatility and high performance price ratio.Like this, according to concrete testing environment, in the course of the work, main frame and each data acquisition unit both can separate, and also can couple together, and realized off-line and online detection respectively.
The existing standard of USB interface mainly contains USB1.1 and USB2.0.The highest communication speed of USB1.1 can reach 12Mbps, and the highest communication speed of USB2.0 can reach 480Mbps in theory.The communication distance of USB interface is shorter.When connecting main frame and data acquisition unit with USB interface, main frame at first is provided with the parameter of each data acquisition unit by USB interface, sends sense command, and starts each data acquisition unit synchronous acquisition regularly.Utilize the hot plug function of USB interface, after the data acquisition unit synchronization timing started, it can not cut off the power supply and separate with main frame, and was arranged to data collection point together with vibration transducer.Utilize each the data acquisition unit clock that starts synchronously, the synchronous acquisition of implementation space diverse location distribution parameter; After gathering end, main frame and data acquisition unit link together by USB interface again, and main frame receives the data of being gathered and carries out signal analysis and processing, obtains detection information, provides testing result.
Use network interface main frame and each data acquisition unit can be constituted a LAN (Local Area Network), realize the On-line Control of main frame each data acquisition unit, the synchronous acquisition of each data acquisition unit, the real-time Transmission of image data and the real-time online of signal are handled.Like this, main frame can in time be adjusted the various parameters of data acquisition unit according to the situation of acquired signal, proofreaies and correct the clock of each data acquisition unit at any time, eliminates the synchronous error between each data acquisition unit.
The leakage signal intensity that sensor obtains is relevant with multiple factor, particularly for complex distribution, and caliber, material and bury the tap water supply pipe network that condition etc. all is not quite similar underground.At first the source leakage signal intensity of leakage point generation is by the decisions such as pressure of leak source shape, size, pipeline inner fluid; Leakage signal propagates in the sensor through the route of transmission of burying formation such as medium underground around piping, fluid and the pipeline simultaneously, and the intensity of signal will change with the difference of propagation distance.In addition, inevitably there are various interference noises in testing environment, and the intensity of noise also changes.Therefore, in the actual detected process, it is unknown that sensor obtains signal intensity, for the lower quantization error, needs according to signal intensity enlargement factor to be adjusted before transducing signal is carried out analog to digital conversion.The present invention in the signals collecting Front-end Design amplifier of control able to programme.After data acquisition unit is received Host Command, at first gather the raw sensory signal, microprocessor provides control signal according to the amplitude characteristic of original signal in conjunction with analog-to-digital dynamic range, change the enlargement factor of programmable amplifier, signal amplitude is nursed one's health.In data acquisition,, still need transducing signal is suitably adjusted for fear of the influence of change in signal strength.Therefore, under offline mode, by main frame be set one time interval, microprocessor is the cycle to adjust enlargement factor repeatedly with this time interval; When adopting the LAN (Local Area Network) connected mode, main frame can calculate suitable enlargement factor according to signal amplitude, and control microprocessor realizes the gain adjustment of signal.
Similarly, the frequecy characteristic of leakage signal is also with leak source, pipeline and to bury factor such as condition underground relevant, and the leakage signal main frequency composition that produces such as plastic conduit and metallic conduit just exists than big-difference.Therefore,, reduce to disturb, improve signal to noise ratio (S/N ratio), need under different applied environments, adjust various parameters such as programmable filter centre frequency, frequency span in order fully to obtain the leakage vibration signal.Native system also can be adjusted sampling rate automatically according to the frequency content of actual acquisition signal.
Because vibration signal has direct relation in ducted velocity of propagation and environment temperature, the present invention proposes to increase temperature sensor in the detecting instrument system, with temperature sensor be placed on the pipeline, data acquisition unit or main frame periphery, acquisition module is not only gathered the leakage vibration signal, also gather simultaneously ambient temperature signal, can reduce error in ducted velocity of propagation according to actual temperature correction vibration signal under current environment like this by the inaccurate leakage positioning that causes of vibration transmission speed.
For the pipe network of complex distribution, if the duct length between two vibration transducers is uncertain of, perhaps Shi Ji vibration transmission speed and predicted, predicted vibration transmission speed and differ than conference and bring error for the leakage positioning of system.The present invention has designed an additional vibration excitation device, in order to measure the physical length of pipeline between two vibration transducers, and the perhaps actual speed of vibration transmission in the measuring channel when duct length can know.This vibration excitation device is made of vibrational excitation source and Vib., and vibrational excitation source exciting Vib. causes definite vibration wave in pipeline.Should determine vibration signal by detecting in the pipeline, calculate the physical length of pipeline between two vibration transducers or in ducted actual vibration transmission speed.
The invention has the beneficial effects as follows: Leak Detection can be finished under off-line or online mode; Can realize enlargement factor, the automatic adjustment of various parameters such as the centre frequency of wave filter, frequency span; Can be according to current temperature value correction vibration transmission speed; Additional vibration excitation device in order to measure two pipeline physical lengths between the vibration transducer, is perhaps proofreaied and correct vibration transmission speed when duct length knows.
Description of drawings
Fig. 1 is online detection architecture synoptic diagram;
Fig. 2 is the offline inspection structural representation;
Fig. 3 is host computer control conditioning parameter, acquisition parameter structural representation;
Fig. 4 is collecting unit control conditioning parameter, acquisition parameter structural representation;
Fig. 5 is the structural representation of data acquisition unit collecting temperature signal correction vibration transmission speed;
Fig. 6 is the structural representation of main frame collecting temperature signal correction vibration transmission speed;
Fig. 7 is the structural representation by the work of collecting unit control driving source;
Fig. 8 is the structural representation by the work of host computer control driving source;
Fig. 9 is that Vib. is positioned over the synoptic diagram between two sensors;
Figure 10 is the synoptic diagram that Vib. is positioned over the two sensors outside.
Among the above-mentioned figure, 1 represents USB interface, and 2 represent network interface, 3 represent vibration transducer, and 4 represent leakage point, and 5 represent pipeline, 6 represent Vib., 7 representation temperature sensors, 8 representative data collecting units, 8-1 representation signal conditioning unit, 9 represent main frame, 10 represent the vibrational excitation source, and 11 represent hub, and 12 represent usb hub.
Embodiment
Consult Fig. 1, Fig. 2, the portable pipe leakage detector is made of main frame 9, usb hub 12, several data acquisition units 8 and vibration transducer 3, and main frame 9 is connected with each data acquisition unit 8 by usb hub 12; Each data acquisition unit 8 connects a vibration transducer 3 respectively.Main frame 9 can also be connected with each data acquisition unit 8 by hub 11.
When selecting the mode that works online shown in Figure 1, vibration transducer 3 is placed into pipeline 5, the network interface 2 of each data acquisition unit 8 and the network interface 2 of main frame 9 couple together by hub 12, constitute a LAN system.The power supply of log-on data collecting unit 8 is finished the initialization of data acquisition unit 8, and main frame 9 sends acquisition parameter by network to data acquisition unit 8, as sample frequency, sampling time, filter parameter etc.Consult Fig. 3, data acquisition unit 8 is made up of signal condition unit 8-1, A/D converter, microprocessor, usb 1, network interface 2, storer, clock source and rechargable power supplies; Signal condition unit 8-1, A/D converter, microprocessor is linked in sequence and be connected with rechargable power supplies respectively, and A/D converter also is connected with the clock source; Microprocessor also is connected with clock source, usb 1, network interface 2, storer respectively, and storer also is connected with rechargable power supplies.Signal condition unit 8-1 is connected and composed by programmable filter and programmable amplifier.
Microprocessor receives the parameter that main frame 9 sends, and the centre frequency of sampling rate and programmable filter and bandwidth etc. are set.Main frame 9 sends pre-sample command after confirming that A/D converter, programmable filter configuration are finished, and microprocessor is adjusted the gain of programmable amplifier according to the dynamic range output control signal of signal collected amplitude characteristic and A/D converter.Gain adjustment is finished aft engine 9 and is sent the formal synchronous acquisition that starts each data acquisition unit 8 of order, and with image data by Network Transmission to main frame 9, the user calls main frame 9 corresponding programs control data collecting unit 8 in gatherer process and readjusts signal gain and programmable filter parameter.Main frame 9 receives the data that each data acquisition unit 8 sends, on the interface, show the signal curve that is obtained, signal is carried out analyzing and processing, find to leak and the location leak source, main frame 9 is with the automatic record analysis result of modes such as webpage, chart, and functions such as printing are provided.
When selecting the mode that works offline shown in Figure 2, the usb 1 of the usb 1 of each data acquisition unit 8 and main frame 9 couples together by usb hub 12, the handshake communication between main frame 9 and each data acquisition unit 8 is finished in log-on data collecting unit 8 power supplys and initialization.
After data acquisition unit 8 initialization were finished, main frame 9 transmitted the parameters such as cycle of sample frequency, acquisition time length, filter parameter, sensor standing time and adjustment enlargement factor to each data acquisition unit 8 by usb 1.After confirming that data acquisition unit 8 configurations are finished, main frame 9 sends synchronous startup command to each data acquisition unit 8, and each data acquisition unit 8 and main frame 9 are separated then, and are arranged into the collection point together with vibration transducer 3, and vibration transducer is placed on the pipeline 5.Consult Fig. 4, data acquisition unit 8 is according to the sensor signal of obtaining, adjust the enlargement factor of signal condition unit 8-1, centre frequency and bandwidth, the A/D sampling rate etc. of programmable filter, simultaneously be subjected to stochastic factor for fear of noise, in the whole data collection process, data acquisition unit 8 will be adjusted above-mentioned parameter repeatedly in the time period of setting.Each data acquisition unit 8 all has a clock control whole data collection process, realizes 8 data synchronization collections of each data acquisition unit, and the data storage of collection is in a mass storage.After finishing the collection of setting-up time length, data acquisition unit 8 reconnects by usb 1 and main frame 9 again, and the data of gathering are sent back main frame 9, and main frame 9 carries out analyzing and processing to these data, and detect and leak, and the location leak source.
Consult Fig. 5, Fig. 6, the velocity of propagation of vibration signal has direct relation with the testing environment temperature, and each data acquisition unit 8 can connect temperature sensor 7, and main frame 9 also can connect temperature sensor 7.By the temperature information that obtains leakage signal is revised along the speed of pipe transmmision, reduced the influence of environment temperature the Pipeline Leakage Point bearing accuracy.
Consult Fig. 7, Fig. 8, main frame 9 connects a vibrational excitation source 10 by usb hub 11 or hub 12, perhaps connects a vibrational excitation source 10 by one of data acquisition unit 8; Vibrational excitation source 10 front ends also connect a Vib. 6, Vib. 6 on pipeline 5, be positioned over one of vibration transducer 3 the next door or with its known position of distance.Before detecting, main frame 9 or data acquisition unit 8 send signal controlling vibrational excitation source 10 exciting Vib.s 6 to vibrational excitation source 10 and produce vibration signal.
Consult Fig. 9, Figure 10, Vib. 6 are positioned over a vibration transducer 3 next door (L
1=0) or with its distance known pipeline on (L
1Be a nonzero value that knows).The vibration signal that Vib. produces is along pipeline transmission, and the time that it arrives two sensors is respectively t
1And t
2, by to two sensor acquisition to signal carry out time delay and estimate, calculate the mistiming Δ t=t that vibration signal arrives two vibration transducers 3
1-t
2Duct length difference Δ L=L between Vib. and two vibration transducers
1-L
2, the satisfied v=Δ L/ Δ t that concerns between the mistiming Δ t of ducted actual vibration transmission speed v and two vibration transducers of vibration signal arrival.For the pipe network of complex distribution, the duct length between two vibration transducers is uncertain of, under the known situation of vibration transmission speed, by formula L=2L
1+ Δ tv (Vib. is positioned between the two sensors) or formula L=v Δ t (Vib. is positioned over the two sensors outside) calculate two pipeline physical lengths between the sensor; The actual vibration transmission speed with predict, predict vibration transmission speed and differ bigger, and under the known situation of the pipeline physical length between two sensors, by v=(L-2L
1)/Δ t (Vib. is positioned between the two sensors) or formula v=L/ Δ t (Vib. is positioned over the two sensors outside) calculate the actual vibration transmission speed.
The AT45DB081 storer that the LTC6910-1 programmable amplifier that Linear Tech produces, MAX7426 programmable filter that U.S. letter company produces, C8051 single-chip microcomputer, ADS7832 A/D converter, Atmel company that cygnal company produces produce can meet design requirement.
Claims (7)
1, a kind of portable checker of pipeline leakage, it is characterized in that: it is made of main frame (9), usb hub (12), several data acquisition units (8) and vibration transducer (3), and main frame (9) is connected with each data acquisition unit (8) by usb hub (12); Each data acquisition unit (8) connects a vibration transducer (3) respectively.
2, portable checker of pipeline leakage according to claim 1 is characterized in that: main frame (9) can also pass through hub (11) and be connected with each data acquisition unit (8).
3, portable checker of pipeline leakage according to claim 1 and 2 is characterized in that: described data acquisition unit (8) is made up of signal condition unit (8-1), A/D converter, microprocessor, USB interface (1), network interface (2), storer, clock source and rechargable power supplies; Signal condition unit (8-1), A/D converter, microprocessor is linked in sequence and be connected with rechargable power supplies respectively, and A/D converter also is connected with the clock source; Microprocessor also is connected with clock source, USB interface (1), network interface (2), storer respectively, and storer also is connected with rechargable power supplies.
4, portable checker of pipeline leakage according to claim 3 is characterized in that: described signal condition unit (8-1) is connected and composed by programmable filter and programmable amplifier.
5, portable checker of pipeline leakage according to claim 1 and 2 is characterized in that: each data acquisition unit (8) can connect temperature sensor (7).
6, portable checker of pipeline leakage according to claim 1 and 2 is characterized in that: main frame (9) can connect temperature sensor (7).
7, according to claim 1,2 or 4 described portable checker of pipeline leakage, it is characterized in that: perhaps connect a vibrational excitation source (10) by usb hub (11) or hub (12), perhaps connect a vibrational excitation source (10) by one of data acquisition unit (8) by main frame (9); Vibrational excitation source (10) front end also connects a Vib. (6), Vib. (6) on pipeline (5), be positioned over one of vibration transducer (3) the next door or with its known position of distance.
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| CN 200510020194 CN1645080A (en) | 2005-01-15 | 2005-01-15 | Portable checker of pipeline leakage |
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| CN 200510020194 CN1645080A (en) | 2005-01-15 | 2005-01-15 | Portable checker of pipeline leakage |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629535A (en) * | 2013-12-10 | 2014-03-12 | 重庆大学 | Distributed leakage detection positioning system of regional pipe network |
| CN104011510A (en) * | 2011-12-16 | 2014-08-27 | 大陆汽车有限责任公司 | Sensor for detecting the mass flow rate and the temperature of a fluid flow |
| CN104359633A (en) * | 2014-12-05 | 2015-02-18 | 电子科技大学 | Ultrasonic testing method for liquid leakage |
| CN105675214A (en) * | 2016-03-22 | 2016-06-15 | 北京中建建筑科学研究院有限公司 | Method and system for positioning leakage point of ventilation pipeline in building |
| CN107271111A (en) * | 2011-01-30 | 2017-10-20 | 阿夸里乌斯光谱有限公司 | Vibrating sensor for detecting leakage |
| CN108709092A (en) * | 2018-05-28 | 2018-10-26 | 山东省科学院激光研究所 | Line leakage method, apparatus and system |
| CN108758354A (en) * | 2018-05-03 | 2018-11-06 | 太原理工大学 | Heat supply pipeline leak detection system and method based on infrasound and reference point |
| CN111765390A (en) * | 2020-05-20 | 2020-10-13 | 吉林省百瑞生科技发展有限公司 | Pipeline leakage point positioning method and system based on acoustic emission response |
-
2005
- 2005-01-15 CN CN 200510020194 patent/CN1645080A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271111A (en) * | 2011-01-30 | 2017-10-20 | 阿夸里乌斯光谱有限公司 | Vibrating sensor for detecting leakage |
| CN104011510A (en) * | 2011-12-16 | 2014-08-27 | 大陆汽车有限责任公司 | Sensor for detecting the mass flow rate and the temperature of a fluid flow |
| CN103629535A (en) * | 2013-12-10 | 2014-03-12 | 重庆大学 | Distributed leakage detection positioning system of regional pipe network |
| CN104359633A (en) * | 2014-12-05 | 2015-02-18 | 电子科技大学 | Ultrasonic testing method for liquid leakage |
| CN105675214A (en) * | 2016-03-22 | 2016-06-15 | 北京中建建筑科学研究院有限公司 | Method and system for positioning leakage point of ventilation pipeline in building |
| CN108758354A (en) * | 2018-05-03 | 2018-11-06 | 太原理工大学 | Heat supply pipeline leak detection system and method based on infrasound and reference point |
| CN108758354B (en) * | 2018-05-03 | 2023-09-12 | 太原理工大学 | Heat supply pipeline leakage detection system and method based on infrasonic wave and reference point |
| CN108709092A (en) * | 2018-05-28 | 2018-10-26 | 山东省科学院激光研究所 | Line leakage method, apparatus and system |
| CN108709092B (en) * | 2018-05-28 | 2020-09-11 | 山东省科学院激光研究所 | Pipeline leakage monitoring method, device and system |
| CN111765390A (en) * | 2020-05-20 | 2020-10-13 | 吉林省百瑞生科技发展有限公司 | Pipeline leakage point positioning method and system based on acoustic emission response |
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