Embedded pipeline leak detection device and leak detection method thereof

Abstract

The invention belongs to the technical field of pipeline leakage detection, and particularly relates to an embedded pipeline leakage detection device and a leakage detection method thereof. The embedded type pipeline leakage detection device comprises a movable base, an infrared thermal imager and a leakage point positioning assembly, the infrared thermal imager and the leakage point positioning assembly are installed below the movable base, and the infrared thermal imager is used for scanning the trend of a pipeline; the leakage point positioning assembly comprises a horn sampling head, a filter, a sampling pump and a gas-sensitive sensor which are sequentially connected through a pipeline, a sampling opening of the horn sampling head faces downwards, and the gas-sensitive sensor is used for detecting gas concentration to determine the position of a leakage point; the leakage point positioning assembly further comprises an ink jet positioner used for conducting ink jet positioning on the position of the leakage point. The gas sensitive sensor detects the concentration change near the pipeline along with the movable base, and the position of a tiny leakage point can be judged; the direction of the pipeline is detected and judged through infrared imaging, an operator can conveniently and quickly find the position of the pipeline in an unknown area, the detection efficiency is improved, and the position of a leakage point can be marked through an ink jet positioner.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline leakage detection, and in particular relates to an embedded pipeline leakage detection device and a leakage detection method thereof. Background Art

[0002] Pipeline systems buried underground or in walls, including water supply, heating, natural gas or other gas pipelines, take a long time to lay. Pipeline leakage may be caused by medium corrosion in the pipe, soil corrosion, defects in the pipe itself, natural or man-made damage.

[0003] Existing pipeline leak detection methods include ultrasonic method, infrared thermal imaging method, listening leak detection method, pressure detection method, etc. Ultrasonic leak detection is when gas passes through the leak hole, it will generate eddy currents, there will be part of the ultrasonic wave band, so that the ultrasonic detector leak detection system can sense gas leakage, but this method has poor penetration into cement concrete, resulting in low detection accuracy, and requires human ear identification, so it is limited by the professionalism of the operator, and cannot work normally in a noisy environment. Infrared imaging leak detection technology uses the temperature difference of the leaking medium in the pipeline to detect leaks. This is a non-destructive leak detection method, but the premise is that there is a significant temperature difference between the leaking medium and the ambient temperature to detect, so it is rarely used in pipeline leak detection. The pressure detection method uses the pressure gauge between each section of the pipeline for detection, but this method can only monitor large-scale leakage events, and the effect is often not good for situations where the pressure does not affect the small leakage and dripping. At the same time, the above methods can only determine whether there is a leak, and cannot accurately and quickly locate the leak point, and it is difficult to meet the practical needs of universality and rapidity of high-precision positioning of tiny leak points. Summary of the invention

[0004] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide an embedded pipeline leak detection device and a leak detection method thereof that meet one or more of the above-mentioned needs.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] An embedded pipeline leak detection device comprises a mobile base and an infrared thermal imager and a leak point positioning assembly installed below the mobile base, wherein the infrared thermal imager is used to scan the direction of the pipeline; the leak point positioning assembly comprises a horn sampling head, a filter, a sampling pump and a gas sensor which are sequentially connected by pipelines, the sampling port of the horn sampling head faces downward, and the gas sensor is used to detect the gas concentration to determine the leak point; the leak point positioning assembly also comprises an inkjet locator for performing inkjet positioning on the leak point.

[0007] As a preferred solution, the mobile base has at least three rollers;

[0008] The mobile base is provided with a counter for counting the number of rotations of the roller.

[0009] As a preferred solution, a handle is provided above the movable base, and the handle is connected to the movable base via two parallel connecting rods.

[0010] As a preferred solution, the angle between the connecting rod and the movable base is 30-60°.

[0011] As a preferred solution, a display screen is provided between the two connecting rods, and the display screen is adjacent to the handle.

[0012] As a preferred solution, a battery is provided between the two connecting rods, and the battery is used to supply power to the infrared thermal imager, the sampling pump, the gas sensor and the inkjet positioner.

[0013] As a preferred solution, a hydrophobic filter membrane with a pore size of 5 μm is provided in the filter.

[0014] As a preferred solution, the diameter of the sampling port of the horn sampling head is 8 to 10 cm, and the sampling channel in the horn sampling head is reduced from the sampling port, and the minimum diameter is 0.5 to 1.5 cm.

[0015] As a preferred solution, the base material of the gas sensor is porous tin oxide nanoparticles with a pore size of 1 to 2 nm;

[0016] If the detection gas is hydrogen, the sensitive nanoparticles carried by the matrix material are palladium particles;

[0017] If the detected gas is hydrogen sulfide, the sensitive nanoparticles carried by the matrix material are gold particles;

[0018] If the detected gas is an alkane gas, the sensitive nanoparticles carried by the matrix material are composite particles of zinc oxide and cobalt;

[0019] The loaded particles are loaded into the pores of tin oxide particles by a hydration synthesis method, and then sintered into powder and coated into a film to form a gas sensor.

[0020] The present invention also provides a leak detection method for the embedded pipeline leak detection device as described in any of the above schemes, comprising:

[0021] While the mobile base is moving, the infrared thermal imager scans the direction of the pipeline;

[0022] The sampling pump works continuously, and the gas escaping from the pipeline is transported to the gas sensor through the horn sampling port, filter, and sampling pump to obtain the gas concentration;

[0023] If the gas concentration is higher than the preset threshold, the inkjet locator is started to spray ink onto the ground to mark the leak location.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention uses a gas sensor to follow the mobile base to detect the concentration changes near the pipeline, determine the location of the tiny leak point, and configure gas sensors with different gas-sensitive characteristics according to the gas components in different pipelines, so that the size of the leak point can be as low as 1 cm; the direction of the pipeline is determined by infrared imaging detection, which facilitates operators to quickly find the location of the pipeline in an unknown area and improves detection efficiency;

[0026] (2) The present invention records the mileage and marks the leak point to mark the leak point during the online detection process, making it easy to quickly and accurately find the leak point during maintenance;

[0027] (3) Compared with the existing ultrasonic leak detection, infrared imaging leak detection and pressure leak detection, the present invention has obvious advantages in the rapid positioning and detection of small leak points, and can be applied to various pipeline leak detection fields by configuring different gas sensors according to the components in the detection pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a schematic structural diagram of an embedded pipeline leak detection device according to Embodiment 1 of the present invention;

[0029] Figure 2 It is a gas detection flow path diagram of the embedded pipeline leak detection device of Example 1 of the present invention. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the embodiments of the present invention, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings and other implementation methods can be obtained based on these accompanying drawings without creative work.

[0031] Embodiment 1:

[0032] like Figure 1 As shown, the embedded pipeline leak detection device of this embodiment includes a mobile base 1, an infrared thermal imager 2, a leak point positioning assembly, a handle 3, a liquid crystal screen 4, and two parallel connecting rods 5 connecting the mobile base 1 and the handle 3.

[0033] Specifically, the mobile base 1 includes three rollers 1-1, a counter 1-2, and a support platform 1-3. The three rollers 1-1 are stably distributed in a triangle, a counter 1-2 is provided between the two rear rollers, a support platform 1-3 is provided on the frame between the rollers, an infrared thermal imager 2 and a leak point positioning assembly are fixed below the support platform 1-3, and a connecting rod 5 is arranged at a 45° angle above the support platform. The counter 1-2 records the number of rotations of the rear roller, thereby recording the moving distance of the mobile base 1, which is convenient for finding the location of the leak point during later maintenance.

[0034] The mobile base 1 is connected to the LCD screen 4 via a connecting rod 5 , and the signals of the infrared thermal imager 2 and the leak point locating assembly are transmitted to the LCD screen 4 , and the measurement results are displayed on the LCD screen 4 .

[0035] In this embodiment, there are two connecting rods 5, one end of which is connected to the support platform 1-3 at a 45° angle, and the other end is provided with a hand grip handle 3. A LCD screen 4 is fixed between the two connecting rods near the handle 3, and a lithium battery 6 is fixedly installed between the two connecting rods near the support platform 1-3.

[0036] The lithium battery 6 of this embodiment is a rechargeable battery, which is electrically connected to the LCD screen 4, the counters 1-2, the infrared thermal imager 2 and the leak point locating assembly and provides power, so that the entire device can be used continuously at the detection site without being constrained by the mains power supply.

[0037] The infrared thermal imager 2 of this embodiment is fixed under the support platform 1-3 of the mobile base. The infrared thermal imager 2 uses the optical system to emit light reflected on different objects and focuses it onto the infrared detector to form a thermal map acquisition image. The infrared thermal imager transmits this image to the LCD screen 4. After enhancing, segmenting and mathematically morphologically processing the image according to the change of regional heat in the infrared image, the position and direction of the pipeline can be tracked.

[0038] The leak point locating assembly of this embodiment includes a horn sampling head 3-1, a filter 3-2, a sampling pump 3-3, a gas sensor 3-4 and an inkjet locator 3-5. The horn sampling head 3-1 is perpendicular to the ground, so that the sampling port of the horn sampling head 3-1 is vertically downward. Figure 2 As shown, the rear end of the speaker sampling head 3-1 is connected to the filter 3-2, the sampling pump 3-3 and the gas sensor 3-4 in sequence, and the data of the gas sensor is transmitted to the LCD screen. The inkjet positioner 3-5 is located next to the speaker sampling port 3-1 and is connected to the LCD screen. The diameter of the large port (i.e., the sampling port) of the speaker sampling head is 10 cm, and the diameter of the small port is 1 cm. The diameter can be adjusted according to actual application requirements.

[0039] The filter 3 - 2 of this embodiment has a built-in hydrophobic filter membrane with a pore size of 5 μm, which is used to filter dust particles and water vapor in the gas to prevent dust particles or water vapor from clogging the gas pipeline.

[0040] The sampling pump of this embodiment operates at a constant flow rate of 50 to 100 mL / min, and transmits the gas to the gas sensor through the horn sampling head and the filter; the flow rate of the sampling pump is determined by the buried depth of the pipeline and the ground material. If the buried depth of the pipeline exceeds 1m, the flow rate is constant at 100 mL / min; if the buried depth of the pipeline is less than 1m, it can be determined according to the ground material. If the ground material is soil, the flow rate is constant at 50 mL / min to prevent excessive flow rate from inhaling more dust and causing pipeline blockage. If the ground material is cement or ceramic, the flow rate is constant at 100 mL / min. The buried depth of the pipeline in an unknown area can be determined by the image output by the infrared thermal imager. The lighter the color of the pipeline image, the deeper the buried depth.

[0041] The gas sensor of this embodiment uses tin oxide nanoparticles as carriers, and different sensitive nanoparticles are loaded according to the components of the detected gas. The response concentration of the sensor is lower than 1ppm, so that leak detection points less than 1cm on the pipeline can also be detected. Specifically, the base material of the gas sensitive sensor is porous tin oxide nanoparticles with a pore size of 1 to 2nm; if the detected gas is hydrogen, the loaded sensitive nanoparticles are palladium particles; if the detected gas is hydrogen sulfide, the loaded sensitive nanoparticles are gold particles; if the detected gas is an alkane gas, the loaded sensitive nanoparticles are composite particles of zinc oxide and cobalt; the loaded particles are loaded into the pores of the tin oxide particles by a hydration synthesis method, and the composite particles are sintered into powder and then coated to form a film to form a gas sensor. The specific sintering and film-forming processes can refer to the prior art and will not be repeated here.

[0042] The inkjet locator 3-5 of this embodiment is a nozzle filled with toner, fixed at the bottom of the support platform 1-3, next to the speaker sampling port, and electrically connected to the LCD screen. When the operator needs to mark the position, the LCD screen inputs a command to control the inkjet locator to spray toner to mark the leak point position.

[0043] The leak detection method of the embedded pipeline leak detection device of this embodiment is as follows:

[0044] The operator holds the handle of the connecting rod to push the whole device to move, and the roller of the mobile base rolls. The counter records the number of rotations of the roller to record the mileage;

[0045] During the movement of the mobile base, the infrared thermal imager scans the direction of the ground pipeline, and the operator determines the direction of the pipeline based on the infrared image displayed on the LCD screen;

[0046] The sampling pump works continuously, and the gas escaping from the pipeline is transported to the gas sensor through the speaker sampling head, filter, and sampling pump. The sensor displays the gas concentration on the LCD screen. When the gas concentration is higher than the threshold, the LCD screen prompts the operator. The operator clicks the mark button, and the inkjet locator sprays toner onto the ground to mark the leak point. The LCD screen records the mileage at this time.

[0047] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, according to the ideas provided by the present invention, there will be changes in the specific implementation methods, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. An embedded pipeline leak detection device, characterized in that: It includes a mobile base and an infrared thermal imager and a leak point locating assembly installed under the mobile base. The infrared thermal imager is used to scan the direction of the pipeline; the leak point locating assembly includes a horn sampling head, a filter, a sampling pump and a gas sensor connected in sequence by pipelines. The sampling port of the horn sampling head faces downward, and the gas sensor is used to detect the gas concentration to determine the leak point location; the leak point locating assembly also includes an inkjet locator for inkjet locating the leak point.

2. The embedded pipeline leak detection device according to claim 1, characterized in that: The mobile base has at least three rollers; The mobile base is provided with a counter for counting the number of rotations of the roller.

3. The embedded pipeline leak detection device according to claim 1 or 2, characterized in that: A handle is arranged above the movable base, and the handle is connected to the movable base through two parallel connecting rods.

4. The embedded pipeline leak detection device according to claim 3, characterized in that: The angle between the connecting rod and the movable base is 30-60 degrees.

5. The embedded pipeline leak detection device according to claim 3, characterized in that: A display screen is arranged between the two connecting rods, and the display screen is adjacent to the handle.

6. The embedded pipeline leak detection device according to claim 3, characterized in that: A battery is arranged between the two connecting rods, and the battery is used to supply power to the infrared thermal imager, the sampling pump, the gas sensitive sensor and the inkjet positioner.

7. The embedded pipeline leak detection device according to claim 1 or 2, characterized in that: The filter is provided with a hydrophobic filter membrane with a pore size of 5 μm.

8. The embedded pipeline leak detection device according to claim 1 or 2, characterized in that: The diameter of the sampling port of the horn sampling head is 8 to 10 cm, and the sampling channel in the horn sampling head is reduced from the sampling port, and the minimum diameter is 0.5 to 1.5 cm.

9. The embedded pipeline leak detection device according to claim 1 or 2, characterized in that: The base material of the gas sensor is porous tin oxide nanoparticles with a pore size of 1 to 2 nm; If the detection gas is hydrogen, the sensitive nanoparticles carried by the matrix material are palladium particles; If the detected gas is hydrogen sulfide, the sensitive nanoparticles carried by the matrix material are gold particles; If the detected gas is an alkane gas, the sensitive nanoparticles carried by the matrix material are composite particles of zinc oxide and cobalt; The loaded particles are loaded into the pores of tin oxide particles by a hydration synthesis method, and then sintered into powder and coated into a film to form a gas sensor.

10. The leak detection method of the embedded pipeline leak detection device according to any one of claims 1 to 9, characterized in that: include: While the mobile base is moving, the infrared thermal imager scans the direction of the pipeline; The sampling pump works continuously, and the gas escaping from the pipeline is transported to the gas sensor through the horn sampling port, filter, and sampling pump to obtain the gas concentration; If the gas concentration is higher than the preset threshold, the inkjet locator is started to spray ink onto the ground to mark the leak location.

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