CN215492313U - Pipeline leakage detection device based on carbon fiber and optical fiber composite sensor - Google Patents
Pipeline leakage detection device based on carbon fiber and optical fiber composite sensor Download PDFInfo
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- CN215492313U CN215492313U CN202120912798.2U CN202120912798U CN215492313U CN 215492313 U CN215492313 U CN 215492313U CN 202120912798 U CN202120912798 U CN 202120912798U CN 215492313 U CN215492313 U CN 215492313U
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Abstract
The utility model discloses a pipeline leakage detection device based on a carbon fiber and optical fiber composite sensor, wherein: the fiber bragg grating sensor is arranged in the carbon fiber, one side of the carbon fiber is bonded with a heat insulation material and is fixed on the pipeline to be detected through the heat insulation material, and the other side of the carbon fiber is bonded with the material bonding protective layer; the fiber grating sensor comprises an optical fiber arranged in the carbon fiber and a plurality of gratings engraved on the optical fiber; the pipe wall of the pipeline is also provided with a plurality of uniformly arranged diversion trenches; the power supply device is arranged outside the device, and two ends of the carbon fiber are respectively connected with the power supply device through positive and negative leads. The utility model adopts the structure that the carbon fiber wraps the fiber bragg grating sensor, the fiber bragg grating sensor more sensitively captures the change of the environmental temperature by heating the carbon fiber in an electric field, and the water which is leaked is conveniently and timely guided to a temperature measuring point by utilizing the flow guide groove, so that the traditional pipeline detection technology is effectively improved, the cost is low, and the popularization is convenient.
Description
Technical Field
The utility model relates to the technical field of pipeline leakage monitoring, in particular to a pipeline leakage detection device based on a carbon fiber and optical fiber composite sensor.
Background
Urban pipelines are responsible for municipal water supply, domestic sewage, rainwater, industrial wastewater and other supply and drainage problems, and play an important role like blood vessels in urban bodies. Pipe network accidents such as pipe explosion, leakage and the like frequently occur, so that the problems of huge economic loss, soil environment pollution and the like are caused, and the main reasons of the accidents are that the structural performance is reduced due to self aging and medium corrosion in the long-term use process of the pipeline. The pipeline belongs to underground concealed engineering, is difficult to install and maintain, and the development of pipeline leakage detection is not slow based on the background. At present, pipeline leakage monitoring is mainly divided into two categories, namely hardware-based monitoring and software-based monitoring. The hardware method mainly comprises a direct observation method, a tracer monitoring method, a pressure sensor monitoring method and the like; the software method mainly comprises an ultrasonic monitoring method, a GPS time tag method, a negative pressure wave detection method and the like. The methods have the problems of untimely prediction, poor positioning accuracy, high cost and the like. The optical fiber sensing technology has the advantages of high measurement precision, electromagnetic interference resistance, good long-term stability, capability of realizing distributed online monitoring and the like, and has great application potential in pipeline leakage monitoring. At present, the purpose of leakage monitoring is achieved by directly measuring the temperature of a pipeline in real time by using optical fiber sensing technologies such as fiber Bragg gratings, Brillouin optical time domain analysis and the like, but the method needs a large temperature gradient between leaked liquid and the environment, the monitoring effect is influenced by seasonal climate change, and the application range of the method is greatly limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a pipeline leakage detection device based on a carbon fiber and optical fiber composite sensor aiming at the defects in the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the utility model provides a pipeline leakage detection device based on a carbon fiber and optical fiber composite sensor, which is arranged on a pipeline to be detected and comprises: the sensor comprises a fiber grating sensor, carbon fibers, a material bonding protective layer and a heat insulating material; wherein:
the fiber bragg grating sensor is arranged in the carbon fiber, one side of the carbon fiber is bonded with a heat insulation material and is fixed on the pipeline to be detected through the heat insulation material, and the other side of the carbon fiber is bonded with the material bonding protective layer; the fiber grating sensor comprises an optical fiber arranged in the carbon fiber and a plurality of gratings engraved on the optical fiber; the pipe wall of the pipeline is also provided with a plurality of uniformly arranged diversion trenches;
the device also includes: a power supply device, positive and negative leads; the power supply device is arranged outside the device, and two ends of the carbon fiber are respectively connected with the power supply device through positive and negative leads.
Further, the apparatus of the present invention further comprises: the system comprises a fiber grating acquisition device, a data acquisition and analysis system, a data line and a carbon fiber bundle outer optical fiber; wherein:
the optical fiber extends to the outside of the carbon fiber and is connected with one end of the outer optical fiber of the carbon fiber bundle, the other end of the outer optical fiber of the carbon fiber bundle is connected with the fiber grating acquisition device, and the fiber grating acquisition device is further connected with the data acquisition and analysis system through a data line.
Further, the bonding mode between the carbon fiber and the fiber bragg grating sensor comprises two modes:
compounding the carbon fiber and the fiber bragg grating sensor by using a vacuum compression molding forming process;
the carbon fiber and the fiber grating sensor are bonded by resin adhesive.
Furthermore, electrodes are led out from two ends of the carbon fiber and are respectively connected with positive and negative leads through the electrodes, and the carbon fiber generates heat under the action of an electric field.
Furthermore, the diversion trench is made of solid adhesive.
Furthermore, the diversion trench of the utility model is continuously arranged on the pipeline and comprises two wavy grooves and a groove arranged between the two wavy grooves transversely and longitudinally.
Further, the heat insulating material of the present invention is bonded and fixed to the duct by a resin adhesive.
The utility model has the following beneficial effects: the pipeline leakage detection device based on the carbon fiber and optical fiber composite sensor overcomes the defects of the existing positioning method in the background technology, adopts the structure that the carbon fiber wraps the optical fiber grating sensor, improves the environmental temperature by heating the carbon fiber in an electric field, and utilizes the temperature reduction of the leakage position to enable the optical fiber grating sensor to more sensitively capture the change of the environmental temperature, thereby accurately positioning the leakage position of the water pipeline and providing reliable support for early warning and overhauling of the water pipeline. Aiming at the condition of small leakage amount, the guide groove formed on the pipeline is utilized to conveniently guide the water at the leakage position to a temperature measuring point in time, so that the timely detection of the leakage of the small-sized transportation liquid pipeline and the determination of the leakage position are realized, the traditional pipeline detection technology is effectively improved, the cost is low, and the popularization is convenient.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the overall structure of an apparatus according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a carbon fiber and optical fiber composite sensor in accordance with an embodiment of the present invention;
in the figure: 1-optical fiber, 2-optical grating, 3-carbon fiber, 4-material bonding protective layer, 5-heat insulating material, 6-pipeline, 7-optical fiber grating acquisition device, 8-data acquisition and analysis system, 9-data line, 10-carbon fiber bundle outer optical fiber, 11-positive and negative electrode lead wire, 12-power supply device and 13-diversion trench.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
As shown in fig. 1-2, the pipe leakage detecting device based on a carbon fiber and optical fiber composite sensor according to an embodiment of the present invention is disposed on a pipe 6 to be detected, and includes: the sensor comprises a fiber grating sensor, carbon fibers 3, a material bonding protective layer 4 and a heat insulating material 5; wherein:
the fiber bragg grating sensor is arranged in the carbon fiber 3, one side of the carbon fiber 3 is bonded with a heat insulating material 5 and is fixed on a pipeline 6 to be detected through the heat insulating material 5, and the other side of the carbon fiber 3 is bonded with a material bonding protective layer 4; the fiber grating sensor comprises an optical fiber 1 arranged inside a carbon fiber 3 and a plurality of gratings 2 engraved on the optical fiber 1; the pipe wall of the pipeline 6 is also provided with a plurality of uniformly arranged diversion trenches 13;
the device also includes: a power supply device 12, positive and negative leads 11; the power supply device 12 is arranged outside the device, and two ends of the carbon fiber 3 are respectively connected with the power supply device 12 through positive and negative leads 11.
The device also includes: the system comprises a fiber grating acquisition device 7, a data acquisition and analysis system 8, a data line 9 and a carbon fiber bundle outer optical fiber 10; wherein:
the optical fiber 1 extends to the outside of the carbon fiber 3 and is connected with one end of an outer optical fiber 10 of the carbon fiber bundle, the other end of the outer optical fiber 10 of the carbon fiber bundle is connected with a fiber grating acquisition device 7, and the fiber grating acquisition device 7 is further connected with a data acquisition and analysis system 8 through a data line 9.
The bonding mode between carbon fiber 3 and the fiber grating sensor includes two kinds:
compounding the carbon fiber 3 and the fiber bragg grating sensor by using a vacuum compression molding process;
the carbon fiber 3 and the fiber grating sensor are bonded by a resin adhesive.
Electrodes are led out from two ends of the carbon fiber 3 and are respectively connected with the positive and negative leads 11 through the electrodes, and the carbon fiber 3 generates heat under the action of an electric field. The diversion trench 13 is made of solid adhesive. The diversion trench 13 is continuously arranged on the pipeline 6, and the diversion trench 13 comprises two wavy grooves and a groove arranged between the two wavy grooves transversely and longitudinally. The heat insulating material 5 is bonded and fixed to the duct 6 by a resin adhesive.
In other embodiments of the utility model:
the manufacturing process of the carbon fiber and optical fiber composite sensor and the process for compounding the carbon fiber and optical fiber composite sensor with the pipeline are consistent, namely, the carbon fiber bundle and the optical fiber grating composite sensor are compounded or directly adhered by a resin adhesive through a vacuum compression molding process, and electrodes are led out from two ends of the carbon fiber bundle; the carbon fiber and optical fiber composite sensor is adhered to the pipeline by using resin adhesives.
Experimental example 1:
in this embodiment, the carbon fiber and optical fiber composite sensor laid under the non-embedded pipeline is regarded as a line heat source. The medium around the pipeline is normal temperature air. Under the condition of continuously electrifying the carbon fiber, the fiber grating sensor is positioned in a temperature field with higher temperature relative to the environment and has no large change, and real-time monitoring is carried out through a data acquisition system. If the pipeline leaks, when the leakage medium flows to the temperature measurement point, the abnormal phenomenon of local low temperature can occur, the temperature change curve obtained by measurement on the distributed optical fiber fluctuates at the moment, and the temperature of part of the measurement point drops. The temperature change characteristics of all positions along the pipeline are analyzed, and the abnormal temperature condition and position are judged, so that the pipeline leakage is monitored and accurately positioned. The degree of leakage can be judged in combination with the trend of temperature change. Using an algorithm, the temperature gradient is measured by interval to deduce the leak location.
The diversion trench can be made of solid adhesive, so that the diversion trench is convenient to be compounded with a pipeline. The pipe wall can be provided with a flow guide groove line according to a certain rule, and the temperature sensing grating is provided with a groove to realize liquid drainage. Under the condition of certain leakage amount, partial liquid can flow to the bottom of the groove along the diversion trench in time due to the action of gravity, namely, the leakage can be monitored in time at the temperature measuring point.
The method for arranging the diversion trenches differently for pipelines with different apertures is mainly characterized in that liquid can be introduced into a temperature measuring position to realize timely monitoring.
Experimental example 2:
to provide more efficient energy application, the monitoring may also be performed using intermittent power supply of the carbon fiber bundle, for example, once per hour for ten minutes.
Case 2: when the power supply is stable, that is, the temperature of the optical fiber is high and stable, the liquid leakage phenomenon occurs near the point where the temperature curve is significantly decreased, as in experimental example 1.
Aiming at the condition of discontinuous power supply, the drainage groove still can play a role, and the monitoring efficiency is improved.
Both experimental cases address the case of a small leak rate.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the utility model as defined in the appended claims.
Claims (7)
1. The utility model provides a pipeline seepage detection device based on carbon fiber and optical fiber composite sensor which characterized in that, the device sets up on waiting to detect pipeline (6), includes: the sensor comprises a fiber grating sensor, carbon fibers (3), a material bonding protective layer (4) and a heat insulating material (5); wherein:
the fiber bragg grating sensor is arranged in the carbon fiber (3), one side of the carbon fiber (3) is bonded with a heat insulating material (5) and is fixed on a pipeline (6) to be detected through the heat insulating material (5), and the other side of the carbon fiber (3) is bonded with a material bonding protective layer (4); the fiber grating sensor comprises an optical fiber (1) arranged inside a carbon fiber (3) and a plurality of gratings (2) engraved on the optical fiber (1); the pipe wall of the pipeline (6) is also provided with a plurality of uniformly arranged diversion trenches (13);
the device also includes: a power supply device (12), and positive and negative leads (11); the power supply device (12) is arranged outside the device, and two ends of the carbon fiber (3) are respectively connected with the power supply device (12) through positive and negative leads (11).
2. The carbon fiber and optical fiber composite sensor-based pipe leakage detection device according to claim 1, further comprising: the device comprises a fiber grating acquisition device (7), a data acquisition and analysis system (8), a data line (9) and a carbon fiber bundle outer optical fiber (10); wherein:
the optical fiber (1) extends to the outside of the carbon fiber (3) and is connected with one end of an outer optical fiber (10) of the carbon fiber bundle, the other end of the outer optical fiber (10) of the carbon fiber bundle is connected with the optical fiber grating acquisition device (7), and the optical fiber grating acquisition device (7) is further connected with the data acquisition and analysis system (8) through a data line (9).
3. The pipe leakage detection device based on the carbon fiber and optical fiber composite sensor is characterized in that the bonding mode between the carbon fiber (3) and the optical fiber grating sensor comprises two modes:
compounding the carbon fiber (3) and the fiber bragg grating sensor by using a vacuum compression molding process;
the carbon fiber (3) and the fiber grating sensor are bonded by resin adhesives.
4. The pipeline leakage detection device based on the carbon fiber and optical fiber composite sensor is characterized in that electrodes are led out from two ends of the carbon fiber (3) and are respectively connected with a positive lead wire and a negative lead wire (11) through the electrodes, and the carbon fiber (3) generates heat under the action of an electric field.
5. The carbon fiber and optical fiber composite sensor-based pipeline leakage detection device according to claim 1, wherein the diversion trench (13) is made of a solid adhesive.
6. The carbon fiber and optical fiber composite sensor-based pipeline leakage detection device according to claim 1, wherein the guiding grooves (13) are arranged in series on the pipeline (6), and the guiding grooves (13) comprise two wavy grooves and a groove arranged transversely and longitudinally between the two wavy grooves.
7. The carbon fiber and optical fiber composite sensor-based pipe leakage detecting device according to claim 1, wherein the heat insulating material (5) is adhesively fixed to the pipe (6) by a resin adhesive.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659735A (en) * | 2022-03-21 | 2022-06-24 | 北京启迪华腾科技开发有限公司 | Method for detecting leakage position of sealing structure of compressed air energy and gas storage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659735A (en) * | 2022-03-21 | 2022-06-24 | 北京启迪华腾科技开发有限公司 | Method for detecting leakage position of sealing structure of compressed air energy and gas storage |
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