Embedded pipeline leak detection device

Abstract

The utility model belongs to the technical field of pipeline leak detection, and particularly relates to an embedded pipeline leak detection device which comprises a movable base, an infrared thermal imager and a leak point positioning assembly, the infrared thermal imager and the leak 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. According to the utility model, the gas-sensitive sensor detects the concentration change near the pipeline along with the movable base, so that 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 utility model belongs to pipeline leak detection technical field, concretely relates to a kind of internally embedded pipeline leak detection device. BACKGROUND

[0002] The pipe network system embedded in the ground or wall, including water supply, heating and natural gas or other gas pipeline laying time is long, medium corrosion in pipe, soil corrosion, pipe defects, natural or man-made damage may cause pipeline leakage.

[0003] The existing pipeline leak detection method includes ultrasonic method, infrared thermal imaging method, sound leak detection method, pressure detection method etc.Ultrasonic leak detection is when gas through leakage hole will produce vortex, there will be the partial of ultrasonic wave band, so that ultrasonic detector leak detection system can induct gas leakage, but this method is poor in penetration to cement concrete, resulting in low detection accuracy, and need to be identified by human ear, thus limited to the professionalism of operator, and cannot carry out normal work in noisy environment.Infrared imaging leak detection technology is to use the temperature difference of leakage medium in pipeline to detect leakage, which is a non-destructive testing method, but the premise is that leakage medium and environment temperature have obvious temperature difference to carry out detection, so it is less used in pipeline leak detection.Pressure detection method is to use pressure gauge between each section of pipeline to detect, but this method can only monitor large-scale leakage event, and the effect is often poor for trace leakage and dripping which have little effect on pressure.At the same time, these methods can only determine whether there is leakage, and cannot accurately and quickly locate the leakage point, so it is difficult to meet the practical needs of universality and rapidity of high-precision positioning of small leakage points. UTILITY MODEL CONTENTS

[0004] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the purposes of the utility model is to solve one or more of the above-mentioned problems in the prior art, in other words, one of the purposes of the utility model is to provide an internally embedded pipeline leak detection device which meets one or more of the above-mentioned needs.

[0005] In order to achieve the above-mentioned utility model purposes, the utility model adopts the following technical solutions:

[0006] An internally embedded pipeline leak detection device, comprising a mobile base and an infrared thermal imager and a leak point positioning assembly installed below the mobile base, the infrared thermal imager is used for scanning the pipeline direction;The leak point positioning assembly comprises a horn sampling head, a filter, a sampling pump and a gas sensor connected in sequence, the sampling port of the horn sampling head faces downward, and the gas sensor is used for detecting gas concentration to determine the leak point position;The leak point positioning assembly further comprises an inkjet positioner, which is used for inkjet positioning of the leak point position.

[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 arranged above the mobile base, and the handle is connected with the mobile base through two parallel connecting rods.

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

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

[0012] As a preferred solution, a battery is arranged between the two connecting rods, and the battery is used for supplying power to the infrared thermal imager, the sampling pump, the gas-sensitive sensor and the ink-jet positioner.

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

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

[0015] As a preferred solution, the base material of the gas-sensitive sensor is a porous tin oxide nanoparticle with a pore size of 1-2 nm.

[0016] If the detected gas is hydrogen, the sensitive nanoparticles loaded on the base material are palladium particles.

[0017] If the detected gas is hydrogen sulfide, the sensitive nanoparticles loaded on the base material are gold particles.

[0018] If the detected gas is an alkane gas, the sensitive nanoparticles loaded on the base material are composite particles of zinc oxide and cobalt.

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

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] (1) The utility model discloses a gas-sensitive sensor for detecting the concentration change near the pipeline following the mobile base, determining the position of the small leakage point, and configuring the gas-sensitive sensor with different gas-sensitive characteristics according to the gas composition in different pipelines, so that the size of the detected leakage point can be as low as 1 cm.

[0022] (2) The utility model discloses a record mileage and mark leak point realize the marking of leak point position in the online detection process, and the leak point position is found quickly and accurately when convenient maintenance.

[0023] (3) The utility model discloses a record mileage and mark leak point realize the marking of leak point position in the online detection process, and the leak point position is found quickly and accurately when convenient maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structure schematic diagram of the internal embedded pipeline leak detection device of the utility model embodiment 1.

[0025] Figure 2 It is the gas detection flow path diagram of the internal embedded pipeline leak detection device of the utility model embodiment 1. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the utility model embodiment, the specific implementation of the utility model will be explained below by comparing the drawings. Obviously, the drawings in the following description are only some embodiments of the utility model, and for ordinary skilled person in the art, other drawings and other implementation can be obtained according to these drawings without creating creative labor.

[0027] Embodiment 1:

[0028] As shown in the drawings, the internal embedded pipeline leak detection device of the embodiment includes mobile base 1, infrared thermal imager 2, leak point positioning assembly, handle 3, liquid crystal screen 4 and two parallel connecting rods 5 connecting mobile base 1 and handle 3. Figure 1 Specifically, mobile base 1 includes three rollers 1-1, counter 1-2 and support table 1-3, three rollers 1-1 are stably distributed in triangle, counter 1-2 is arranged between the back two rollers, support table 1-3 is arranged on the frame between the rollers, infrared thermal imager 2 and leak point positioning assembly are fixed below support table 1-3, and connecting rod 5 is arranged at 45 ° angle above support table. Counter 1-2 records the rotation number of the back roller to record the moving distance of mobile base 1, which is convenient for finding the position of leak point in later maintenance.

[0029] Mobile base 1 is connected with liquid crystal screen 4 through connecting rod 5, and the signal transmission of infrared thermal imager 2 and leak point positioning assembly is transmitted to liquid crystal screen 4, and the measurement result is displayed on liquid crystal screen 4.

[0030]

[0031] ​The connecting rods 5 of the embodiment have two ends, one end of which is connected to the support table 1-3 at an angle of 45°, and the other end is provided with a handgrip 3. The liquid crystal screen 4 is fixed between the two connecting rods near the handgrip 3. The lithium battery 6 is fixed between the two connecting rods near the support table 1-3.

[0032] The lithium battery 6 of the embodiment is a rechargeable battery, which is electrically connected to the liquid crystal screen 4, the counter 1-2, the infrared thermal imager 2 and the leak point positioning assembly and provides power supply, so that the entire device can be continuously used in the detection site and is not restricted by the power supply.

[0033] The infrared thermal imager 2 of the embodiment is fixed below the support table 1-3 of the mobile base. The infrared thermal imager 2 focuses the light reflected on different objects by the light source emitted by the optical system to the infrared detector to form a thermal image and acquires an image. The infrared thermal imager transmits the image to the liquid crystal screen 4. After the image is enhanced, segmented and mathematically morphologically processed according to the change of the heat of the area in the infrared image, the position and direction of the pipeline can be tracked.

[0034] The leak point positioning assembly of the 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, as shown in Figure 2 The rear end of the horn sampling head 3-1 is sequentially connected to the filter 3-2, the sampling pump 3-3 and the gas sensor 3-4 through pipelines. The data of the gas sensor is transmitted to the liquid crystal screen. The inkjet locator 3-5 is located beside the horn sampling port 3-1 and is connected to the liquid crystal screen. The large port (i.e. the sampling port) of the horn sampling head has a diameter of 10 cm, and the small port has a diameter of 1 cm. The diameters can be adjusted according to actual application requirements.

[0035] The filter 3-2 of the embodiment is internally provided with a 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 blocking the gas pipeline.

[0036] The sampling pump of the embodiment operates at a constant flow rate of 50-100 mL / min, and the gas is transmitted to the gas sensor through the horn sampling head and the filter. The flow rate of the sampling pump is determined according to the buried depth of the pipeline and the ground material. If the buried depth of the pipeline exceeds 1 m, the flow rate is constant at 100 mL / min. If the buried depth of the pipeline is less than 1 m, the flow rate 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 the pipeline from being blocked by the large amount of dust sucked due to the large flow rate. If the ground material is cement or ceramic, the flow rate is constant at 100 mL / min. The buried depth of the pipeline in the unknown area can be determined by the image output by the infrared thermal imager. The color of the pipeline image is lighter, indicating that the buried depth is deeper.

[0037] The gas sensitive sensor of the embodiment takes tin oxide nanoparticles as a carrier, and different sensitive nanoparticles are loaded according to the components of the detected gas, and the response concentration of the sensor is lower than 1ppm, so that a leakage point of 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 1-2nm; 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 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 into a film to form the gas sensitive sensor. The specific sintering and film forming processes can refer to the prior art, and will not be described here.

[0038] The inkjet positioner 3-5 of the embodiment is an ink-filled nozzle fixed to the bottom of the support table 1-3 beside the horn sampling port, and is electrically connected to the liquid crystal screen. When the operator needs to mark a position, the liquid crystal screen inputs a command to control the inkjet positioner to spray ink powder to mark the position of the leakage point.

[0039] The detection method of the embedded pipeline leakage detection device of the embodiment is as follows:

[0040] The operator holds the hand-held handle of the connecting rod and pushes the entire device to move, the rollers of the moving base roll, and the counter records the number of rotations of the rollers to record the mileage;

[0041] During the movement of the moving base, the infrared thermal imager scans the ground pipeline direction, and the operator judges the pipeline direction according to the infrared image displayed on the liquid crystal screen;

[0042] The sampling pump continuously works, the gas escaping from the pipeline is transported to the gas sensitive sensor through the horn sampling head, the filter and the sampling pump, and the sensor displays the gas concentration to the liquid crystal screen; when the gas concentration is higher than the threshold value, the liquid crystal screen prompts the operator, the operator clicks the marking button, the inkjet positioner sprays ink powder to the ground to mark the leakage point, and the liquid crystal screen records the mileage at this time.

[0043] The above only describes the preferred embodiments and principles of the utility model in detail, and for ordinary skilled persons in the art, according to the idea provided by the utility model, there will be changes in the specific implementation mode, and these changes should also be regarded as the protection range of the utility model.

Claims

1. An embedded pipeline leak detection apparatus, characterized by, The mobile base is provided with at least three rollers.

2. The inline leak detector of claim 1, wherein, The mobile base is provided with a counter for counting the number of rotations of the rollers. The mobile base is provided with a handle above the mobile base, and the handle and the mobile base are connected by two parallel connecting rods.

3. The embedded pipeline leak detection apparatus according to claim 1 or 2, wherein, The angle between the connecting rods and the mobile base is 30-60°.

4. The inline leak detector of claim 3, wherein, A display screen is arranged between the two connecting rods and adjacent to the handle.

5. The inline leak detector of claim 3, wherein, A battery is arranged between the two connecting rods for supplying power to the infrared thermal imager, the sampling pump, the gas sensor and the ink jet locator.

6. The inline leak detector of claim 3, wherein, The filter is provided with a hydrophobic filter membrane with a pore size of 5 μm.

7. The embedded leak detection apparatus of claim 1 or 2, wherein, The sampling port of the horn sampling head has a diameter of 8-10 cm, and the sampling channel in the horn sampling head is tapered from the sampling port to a minimum diameter of 0.5-1.5 cm.

8. The embedded pipeline leak detection apparatus according to claim 1 or 2, wherein, ​

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