Electric power line adjacent natural gas pipeline drainage grounding device and drainage method thereof

Abstract

The invention relates to the technical field of pipeline drainage, and discloses a drainage grounding device for a natural gas pipeline adjacent to an electric power circuit and a drainage method thereof. The electric power line adjacent natural gas pipeline drainage grounding device comprises a plurality of current signal detectors and an external detection assembly, and the current signal detectors are arranged in a to-be-detected pipeline, so that the detection range of the drainage condition in the to-be-detected pipeline is expanded, and the accuracy of a detection result is guaranteed. The external detection assembly comprises a conductive tube, a soil simulation filler layer and an image acquisition module, the conductive tube and the soil simulation filler layer restore the corrosion condition of the to-be-detected pipeline under stray current interference in a real soil environment, and the image acquisition module is used for performing image acquisition on the outer wall surface of the to-be-detected pipeline; and drainage conditions inside and outside the to-be-detected pipeline can be known through detection. The invention further provides a drainage method of the drainage grounding device for the natural gas pipeline adjacent to the power line, and the detection reliability of the drainage effect of the to-be-detected pipeline is high.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline drainage, and particularly to a drainage grounding device for a natural gas pipeline adjacent to a power line and a drainage method thereof. Background Art

[0002] To improve the utilization rate of land resources, most of the existing oil and gas pipelines and power line constructions adopt the construction form of an integrated energy corridor, integrating the transportation, conversion and supporting facilities of oil and gas and electric energy. Inevitably, there will be situations where oil and gas pipelines and overhead power lines in the integrated energy corridor are adjacent or cross each other. At this time, the potential of the pipeline will fluctuate abnormally due to the electromagnetic coupling effect between the power line and the pipeline, resulting in stray current. Under the continuous action of the stray current, the pipeline will undergo electrochemical corrosion, accelerating the corrosion rate of the pipeline.

[0003] To observe the drainage situation of the pipeline under the influence of stray current, a related technology proposes a corrosion detection device resistant to stray current. A first sleeve and a second sleeve are arranged on the metal pipeline, and an industrial camera is fixed on the second sleeve. The first sleeve and the second sleeve can rotate or move horizontally on the metal pipeline at the same time, thereby driving the industrial camera to move inside the metal pipeline to clearly judge the drainage situation inside the metal pipeline.

[0004] The above industrial camera is arranged inside the pipeline. The rotation or movement of the first sleeve and the second sleeve can only drive the industrial camera to photograph the corrosion situation on the inner side of the pipeline. However, for some buried pipelines with a large outer diameter or a wide span of stray current corrosion of the pipeline, the distribution of stray current on the inner and outer walls of the pipeline is inconsistent, and the outer wall of the pipeline will also be corroded under the influence of factors such as the magnetic field or humidity of the external environment. Observing only the corrosion situation of the inner wall of the pipeline cannot evaluate and judge the overall drainage situation of the pipeline. Summary of the Invention

[0005] Based on the above problems, the purpose of the present invention is to provide a drainage grounding device for a natural gas pipeline adjacent to a power line and a drainage method thereof, which can detect the drainage situations on both the inner and outer sides of the pipeline, expand the detection range, and improve the accuracy and reliability of the detection results.

[0006] To achieve the above purpose, the following technical solutions are provided:

[0007] In a first aspect, the present invention provides a drainage grounding device for a natural gas pipeline adjacent to a power line, including:

[0008] A current signal detector, and a plurality of current signal detectors are arranged inside the pipeline to be measured. The plurality of current signal detectors are used to detect the current signal inside the pipeline to be measured to obtain the internal drainage situation of the pipeline to be measured;

[0009] External detection component, which includes a conductive pipe, a soil simulation filler layer, and an image acquisition module. The conductive pipe is sleeved outside the pipeline to be measured, and both ends of the conductive pipe are sealed and connected to the pipeline to be measured; the soil simulation filler layer is arranged inside the conductive pipe, and the internal filler is a transparent conductive filler. The conductivity of both the conductive pipe and the soil simulation filler layer is weaker than that of the pipeline to be measured; the image acquisition module is arranged inside the conductive pipe and is movably connected to the pipeline to be measured, and the image acquisition module is used to acquire images of the outer wall surface of the pipeline to be measured.

[0010] Optionally, the external detection component further includes a guiding ring and a fixing rod. The guiding ring is arranged on the outer wall surface of the pipeline to be measured, the fixing rod is slidably arranged on the guiding ring, the image acquisition module is arranged on the fixing rod, and the fixing rod can slide along the guiding ring to drive the image acquisition module to move along the outer wall surface of the pipeline to be measured.

[0011] Optionally, the drainage grounding device for the power line adjacent to the natural gas pipeline further includes a driving component and a rotating disk. The rotating disk is rotatably connected to the outer wall surface of the pipeline to be measured, the fixing rod is arranged on the rotating disk, and the driving component can drive the rotating disk to rotate to drive the fixing rod to slide along the guiding ring.

[0012] Specifically, the driving component includes a driving motor and a driving gear. A toothed structure that can mesh with the driving gear is arranged on the rotating disk, and the driving motor can drive the driving gear to rotate to drive the rotating disk to rotate along the axis of the pipeline to be measured.

[0013] Specifically, the drainage grounding device for the power line adjacent to the natural gas pipeline further includes a connecting sleeve. The connecting sleeve is arranged on the outer wall surface of the pipeline to be measured and is connected to the guiding ring. The connecting sleeve is provided with through holes for the signal lines of the image acquisition module and the signal lines of the plurality of current signal detectors to pass through.

[0014] Optionally, the drainage grounding device for the power line adjacent to the natural gas pipeline further includes a first limit switch and a second limit switch. The first limit switch and the second limit switch are respectively arranged at the first position and the second position of the guiding ring. The first position and the second position are located on both sides of the connecting sleeve. The first limit switch is used to monitor whether the image acquisition module moves to the first position, and the second limit switch is used to monitor whether the image acquisition module moves to the second position.

[0015] Specifically, the external detection component further includes a transparent insulating partition. The transparent insulating partition is arranged inside the conductive pipe and is respectively sealed and connected to the conductive pipe and the pipeline to be measured. The transparent insulating partition divides the conductive pipe into a first chamber and a second chamber. The image acquisition module is arranged in the first chamber, and the soil simulation filler layer is filled in the second chamber.

[0016] Optionally, the drainage grounding device for the power line adjacent to the natural gas pipeline further includes an insulating pipe, which is arranged inside the pipeline to be measured. The insulating pipe is communicated with the fluid channel of the pipeline to be measured, and the outer wall surfaces of both ends of the insulating pipe are hermetically connected to the inner wall surface of the pipeline to be measured. A plurality of current signal detectors are arranged on the outer peripheral side of the insulating pipe.

[0017] Optionally, the drainage grounding device for the power line adjacent to the natural gas pipeline further includes a processing system, which is electrically connected to the current signal detector and the image acquisition module respectively to obtain and output the drainage conditions inside and outside the pipeline to be measured respectively.

[0018] In a second aspect, the present invention also provides a drainage method for the drainage grounding device for the power line adjacent to the natural gas pipeline. The above-mentioned drainage grounding device for the power line adjacent to the natural gas pipeline is used to detect the drainage condition of the pipeline to be measured, including the following steps:

[0019] A conductive pipe is sleeved outside the pipeline to be measured, and a soil simulation filler layer is arranged inside the conductive pipe to simulate the real drainage condition of the pipeline to be measured in the soil environment;

[0020] Under the influence of stray current, electrochemical corrosion occurs in the pipeline to be measured;

[0021] The current signal inside the pipeline to be measured is detected by the current signal detector, and the differences between the current signals of the plurality of current signal detectors are compared to obtain the drainage condition inside the pipeline to be measured;

[0022] The image of the outer wall surface of the pipeline to be measured is collected by the image acquisition module to obtain the drainage condition of the outer wall surface of the pipeline to be measured.

[0023] The beneficial effects of the present invention are as follows:

[0024] The present invention provides a drainage grounding device for a natural gas pipeline adjacent to a power line, which is used to detect the drainage situation of a pipeline to be measured under the influence of stray current. A conductive pipe is sleeved outside the pipeline to be measured, and a soil simulation filler layer and an image acquisition module are arranged inside the conductive pipe. The image acquisition module can record the distribution of the soil simulation filler layer along the outer wall surface of the pipeline to be measured, so as to directly obtain the drainage situation of the outer wall surface of the pipeline to be measured. The image acquisition module is movably connected to the pipeline to be measured, increasing the detection range of the drainage situation of the outer wall surface of the pipeline to be measured. A plurality of current signal detectors capable of detecting current signals are arranged inside the pipeline to be measured. Through the change of the current signal, it can be evaluated whether the inner wall of the pipeline is corroded under the influence of stray current and the approximate corrosion position can be determined. The present invention is provided with current signal detectors inside the pipeline to be measured and an image acquisition module outside the pipeline, and the drainage situations inside and outside the pipeline to be measured can be known. The conductivity of the conductive pipe and the soil simulation filler layer is weaker than that of the pipeline to be measured, and the two can simulate the natural working environment of the pipeline to be measured, ensuring that the drainage environment of the outer wall surface of the pipeline to be measured is consistent with the actual situation and improving the reliability of the detection results. In order to facilitate the image acquisition module to acquire images of the outer wall surface of the pipeline to be measured, the filler inside the soil simulation filler layer is a transparent conductive filler. The present invention also provides a drainage method for a drainage grounding device for a natural gas pipeline adjacent to a power line, using the above-mentioned drainage grounding device for a natural gas pipeline adjacent to a power line to detect the drainage situations inside and outside the pipeline to be measured, enhancing the detection reliability of the drainage effect of the pipeline to be measured, and the drainage methods for the inner and outer walls are different, and the reliability and accuracy of the detection results are relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0026] Figure 1 is a schematic structural diagram of a drainage grounding device for a natural gas pipeline adjacent to a power line provided by a specific embodiment of the present invention;

[0027] Figure 2 is a partial schematic structural diagram of a drainage grounding device for a natural gas pipeline adjacent to a power line provided by a specific embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram inside the conductive pipe provided by a specific embodiment of the present invention;

[0029] Figure 4It is a partial structural schematic diagram of the driving component and the external detection component provided by the specific embodiment of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the current signal detector, the pipeline to be measured, the connecting sleeve and the insulating pipe in the drainage grounding device for the power line adjacent to the natural gas pipeline provided by the specific embodiment of the present invention;

[0031] Figure 6 It is a structural schematic diagram of multiple current signal detectors from the first perspective provided by the specific embodiment of the present invention;

[0032] Figure 7 It is a structural schematic diagram of multiple current signal detectors from the second perspective provided by the specific embodiment of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the processing system provided by the specific embodiment of the present invention;

[0034] Figure 9 It is a structural schematic diagram of the cabinet body and the processing system provided by the specific embodiment of the present invention;

[0035] Figure 10 It is the drainage detection principle diagram of the drainage grounding device for the power line adjacent to the natural gas pipeline provided by the specific embodiment of the present invention.

[0036] In the figure:

[0037] 1. Current signal detector; 2. Pipeline to be measured; 3. External detection component; 31. Conductive pipe; 32. Soil simulation filler layer; 33. Image acquisition module; 34. Guide ring; 35. Fixed rod; 36. Transparent insulating partition; 4. Driving component; 41. Driving motor; 42. Driving gear; 5. Rotating disk; 51. Tooth-like structure; 6. Connecting sleeve; 61. Multi-channel wire; 62. Multi-channel plug; 7. Insulating pipe; 8. Processing system; 81. Signal amplifier; 82. Processor; 83. Oscilloscope; 84. Controller; 85. Display screen; 86. Communicator; 9. Cabinet body; 91. Cabinet door. Specific embodiment

[0038] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner" and "outer" and the like is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first chamber" and "second chamber" are two different chambers.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Stray current refers to the current flowing through a non-prescribed path. This current flows through the soil and enters the pipeline at a certain part of the pipeline. After flowing along the pipeline for a certain distance, it flows back into the soil from the pipeline. At the outflow part of the stray current, the metal material of the pipeline will undergo electrochemical dissolution, causing pipeline corrosion. Stray current includes dynamic stray current and static stray current. Dynamic stray current refers to the current generated by external factors such as rail transit interference. Dynamic stray current can cause pipeline potential fluctuations and accelerate the corrosion rate of the pipeline. Static stray current refers to the current generated due to factors such as leakage of the cathodic protection system. Under the long-term action of static stray current, the pipeline is also prone to local corrosion.

[0042] As Figures 1 to 10 shown, the present invention provides a drainage grounding device for a power line adjacent to a natural gas pipeline, which is used to detect the corrosion condition of a pipeline 2 to be measured under the influence of stray current, so as to know the drainage effect of the pipeline 2 to be measured. The drainage grounding device for a power line adjacent to a natural gas pipeline includes a current signal detector 1 and an external detection component 3. Among them, a plurality of current signal detectors 1 are arranged inside the pipeline 2 to be measured, and the plurality of current signal detectors 1 are used to detect the current signals inside the pipeline 2 to be measured. Compared with the current signal detection of a single cross-section, setting a plurality of current signal detectors 1 can expand the detection range inside the pipeline 2 to be measured, improve the accuracy of the detection result, and by comparing the differences in the current signals of the plurality of current signal detectors 1, based on parameters such as current waveform, frequency or amplitude characteristics, the drainage condition inside the pipeline 2 to be measured can be known, and the approximate corrosion position inside the pipeline 2 to be measured can be judged, so as to evaluate the drainage effect inside the pipeline 2 to be measured.

[0043] As shown Figures 2 - 4 in the figure, the external detection component 3 includes a conductive pipe 31, a soil simulation filler layer 32, and an image acquisition module 33. The conductive pipe 31 is sleeved outside the pipeline 2 to be measured, and both ends of the conductive pipe 31 are hermetically connected to the pipeline 2 to be measured. To fill the gaps between the two ends of the conductive pipe 31 and the pipeline 2 to be measured, insulating plates can be set at the two ends of the conductive pipe 31. The soil simulation filler layer 32 is arranged inside the conductive pipe 31 to effectively restore the corrosion situation of the pipeline 2 to be measured under the influence of stray current in the real soil environment. To facilitate the image acquisition module 33 to acquire the image of the outer wall surface of the pipeline 2 to be measured, the filler inside the soil simulation filler layer 32 is a transparent conductive filler. The electrical conductivity of both the conductive pipe 31 and the soil simulation filler layer 32 is weaker than that of the pipeline 2 to be measured. At this time, the stray current will preferentially electrolyze the pipeline 2 to be measured, avoiding interference in the detection process of the drainage situation of the pipeline 2 to be measured caused by the existence of the conductive pipe 31 and the soil simulation filler layer 32, and enhancing the accuracy of the internal drainage detection result of the pipeline 2 to be measured. The image acquisition module 33 is arranged inside the conductive pipe 31 and is used to acquire the image of the outer wall surface of the pipeline 2 to be measured. When corrosion spots, cracks, deformed welds, etc. appear in the image, it indicates that the pipeline 2 to be measured in this area has been corroded. The image acquisition module 33 is movably connected to the outer wall surface of the pipeline 2 to be measured, which can expand the image acquisition range and improve the reliability of the detection result.

[0044] An image acquisition module 33 is arranged outside the pipeline 2 to be measured, and multiple current signal detectors 1 are arranged inside the pipeline 2 to be measured. The drainage situations inside and outside the pipeline 2 to be measured can be known by the drainage grounding device for a natural gas pipeline adjacent to a power line proposed by the present invention. Moreover, the detection methods for the drainage situations inside and outside the pipeline 2 to be measured are different. By detecting the drainage situation of the pipeline 2 to be measured according to different detection methods and detection principles, the reliability and accuracy of the detection result can be improved.

[0045] As shown Figures 5 - 7As shown, the drainage grounding device for a power line adjacent to a natural gas pipeline may further include an insulating pipe 7. The insulating pipe 7 is disposed inside the pipeline 2 to be measured. The insulating pipe 7 is in communication with the fluid passage of the pipeline 2 to be measured. The outer wall surfaces of both ends of the insulating pipe 7 are hermetically connected to the inner wall surface of the pipeline 2 to be measured. The hermetic connection between the insulating pipe 7 and the pipeline 2 to be measured can isolate the plurality of current signal detectors 1 from the internal fluid of the pipeline 2 to be measured, preventing the current signal detectors 1 from being scoured or corroded by the internal fluid of the pipeline 2 to be measured, and extending the service life of the current signal detectors 1. The insulating pipe 7 can be made of ceramic material. Insulating gaskets can be respectively provided on the outer wall surfaces at both ends of the insulating pipe 7 to enhance the sealing effect between the insulating pipe 7 and the inner wall surface of the pipeline 2 to be measured. The plurality of current signal detectors 1 are disposed on the outer peripheral side of the insulating pipe 7 and can be evenly distributed along the axial and circumferential directions of the insulating pipe 7 to achieve synchronous detection of the axial and circumferential directions of the pipeline 2 to be measured and expand the detection range. The current signal detectors 1 located on the same axis of the insulating pipe 7 can be connected by connecting wires to output current signals at different positions on the inner wall of the pipeline 2 to be measured. The projection angles of the current signal detectors 1 located in the circumferential direction of the insulating pipe 7 on the end face of the pipeline 2 to be measured are between 30° and 60°.

[0046] The coverage range of the insulating pipe 7 needs to be slightly larger than the detection range of the conductive pipe 31 to reduce the influence of the conductive medium inside the fluid in the pipeline 2 to be measured on the drainage detection result and improve the accuracy of the detection result. Stray current has the characteristic of regional distribution. For example, the interference of stray current on the pipeline 2 to be measured is stronger in areas close to high-voltage lines or tracks. To evaluate the overall drainage situation of the pipeline 2 to be measured, the drainage grounding device for a power line adjacent to a natural gas pipeline proposed in the present invention needs to be set at certain intervals (such as 1 - 2 km) to achieve segmented detection and improve the integrity and reliability of the detection result.

[0047] To improve the acquisition process of the image acquisition module 33, a transparent insulating partition 36 can be arranged in the conductive pipe 31. The transparent insulating partition 36 is annular, and the inner and outer edges thereof are respectively sealed and connected to the pipeline to be measured 2 and the conductive pipe 31. The transparent insulating partition 36 divides the conductive pipe 31 into a first chamber and a second chamber. The image acquisition module 33 is arranged in the first chamber, and the soil simulation filler layer 32 is filled and arranged in the second chamber. After the conductive pipe 31 is divided into the first chamber and the second chamber, when the image acquisition module 33 moves on the outer wall surface of the pipeline to be measured 2, the soil simulation filler layer 32 inside the conductive pipe 31 will not interfere with the movement process of the image acquisition module 33, and the acquisition process of the image acquisition module 33 can proceed smoothly. The soil simulation filler layer 32 can be filled with transparent conductive filler, and the transparent insulating partition 36 can be a transparent plate made of transparent material to facilitate the image acquisition module 33 to acquire images of the outer wall surface of the pipeline to be measured 2. Since the pipeline to be measured 2 is usually laid underground and the surrounding environment light is relatively dim, a lighting device can be arranged near the image acquisition module 33 to avoid interference of the surrounding acquisition environment on the acquisition process and improve the acquisition process of the image acquisition module 33.

[0048] To improve the acquisition coverage rate of the external image of the pipeline to be measured 2 by the image acquisition module 33, the image acquisition module 33 can be slidably connected to the outer wall surface of the pipeline to be measured 2. In an embodiment, the external detection assembly 3 further includes a guiding ring 34 and a fixing rod 35. The guiding ring 34 is fixedly arranged on the outer wall surface of the pipeline to be measured 2, the fixing rod 35 is slidably arranged in the guiding ring 34, the image acquisition module 33 is arranged on the fixing rod 35, and the fixing rod 35 can slide along the guiding ring 34 to drive the image acquisition module 33 to move along the outer wall surface of the pipeline to be measured 2. Limit grooves can be formed on the fixing rod 35, and the limit grooves and the guiding ring 34 can cooperate with each other to realize the sliding stability of the fixing rod 35 along the guiding ring 34, thereby improving the movement stability of the image acquisition module 33. In other embodiments, the image acquisition module 33 can also realize the image acquisition process of the outer wall surface of the pipeline to be measured 2 by arranging structures such as slide rails on the outer wall surface of the pipeline to be measured 2. The slide rail can be a linear track distributed along the axial direction of the pipeline to be measured 2 or a curved track spirally distributed along the outer wall surface of the pipeline to be measured 2. The image acquisition module 33 can move along the established track of the slide rail. After the slide rail is arranged, the image acquisition range of the image acquisition module 33 is expanded, and the detection reliability of the drainage condition of the outer wall surface of the pipeline to be measured 2 is higher.

[0049] The drainage grounding device for a power line adjacent to a natural gas pipeline may further include a driving component 4 and a rotating disk 5. The rotating disk 5 is rotatably connected to the outer wall surface of the pipeline to be measured 2, and the image acquisition module 33 may be arranged on the rotating disk 5 so that the image acquisition module 33 can rotate along the outer wall surface of the pipeline to be measured 2 under the drive of the driving component 4. The fixing rod 35 may also be connected to the rotating disk 5. The driving component 4 can drive the rotating disk 5 to rotate to drive the fixing rod 35 to slide along the guiding ring 34. The sliding process of the fixing rod 35 along the guiding ring 34 is realized by the driving component 4, which reduces the labor intensity of the inspectors compared with manual driving, improves the running stability of the fixing rod 35 sliding along the guiding ring 34, enhances the image acquisition uniformity of the image acquisition module 33, and enhances the accuracy of the detection result of the drainage condition on the outer wall surface of the pipeline to be measured 2. To ensure the continuous normal operation process of the driving component 4 in the underground environment, the driving component 4 can be placed in a sealed box. The driving component 4 may include a driving motor 41 and a driving gear 42. A toothed structure 51 that can mesh with the driving gear 42 is arranged on the rotating disk 5. The driving motor 41 can drive the driving gear 42 to rotate to drive the rotating disk 5 to rotate along the axis of the pipeline to be measured 2. The driving cooperation mode between the driving motor 41 and the driving gear 42 is simple and has high versatility.

[0050] As Figure 1 , Figure 2 , Figure 8 and Figure 9 shown, the drainage grounding device for a power line adjacent to a natural gas pipeline may further include a processing system 8. The processing system 8 is electrically connected to the current signal detector 1 and the image acquisition module 33 respectively to obtain and output the drainage conditions inside and outside the pipeline to be measured 2 respectively. The processing system 8 may include a signal amplifier 81, a processor 82, an oscilloscope 83, a controller 84, a display screen 85 and a communicator 86. Among them, the signal amplifier 81 is used to amplify the detection signal, the processor 82 is used to process the output signal or image, the oscilloscope 83 is used to convert the current signal into an image, the display screen 85 is used to display the image to facilitate the inspectors to directly observe the drainage conditions inside and outside the pipeline to be measured 2, and the communicator 86 is used for the inspectors to obtain the drainage conditions of the pipeline to be measured 2 in a timely manner at a long distance. The communicator 86 can transmit relevant communication signals to the hardware system, and then the relevant software receives the data through wireless communication. To reduce the space occupied by the processing system 8 and improve the dust and moisture protection performance, the processing system 8 can be placed in a cabinet 9. The cabinet 9 is installed on the ground near the pipeline to be measured 2. Setting the cabinet 9 can also reduce the overall laying range of signal lines or wires and reduce the equipment cost. For convenient maintenance, a cabinet door 91 is hinged on one side of the cabinet 9, and a sealing gasket is arranged on the inner side of the cabinet door 91 to improve the overall sealing effect of the cabinet 9.

[0051] As Figures 1 - 10As shown, in one embodiment, the process for obtaining the drainage situation inside the pipeline 2 to be measured is as follows. Multiple current signal detectors 1 provided on the outer peripheral side of the insulating pipe 7 are used to obtain the current signals at different positions inside the pipeline 2 to be measured. Then, the signal output ends of the current signal detectors 1 transmit the detected current signals to the signal amplifier 81 through signal lines. The signal amplifier 81 amplifies the current signals and transmits them to the processor 82. Then, the processor 82 transmits the received current signals to the oscilloscope 83. The oscilloscope 83 performs oscilloscope processing on the current signals from different current signal detectors 1, converting the current signals into images. The controller 84 is electrically connected to the oscilloscope 83 and the display screen 85 respectively. According to the current distribution of the images fed back by different current signal detectors 1, the drainage situation and the approximate corrosion location inside the pipeline 2 to be measured can be obtained. The current intensity in the corrosion area is significantly higher than that in other areas and the direction is clear, and the potential will also show an obvious positive shift. Setting multiple current signal detectors 1 can obtain multiple sets of data simultaneously. Based on the multiple sets of current data, a potential gradient map can be constructed, and combined with the images, the corrosion risk level of the pipeline 2 to be measured can be obtained. Moreover, the multiple current signal detectors 1 combined with the processing system 8 can record the peak current and its spatio-temporal distribution, and combined with the images, the corrosion trend inside the pipeline 2 to be measured can be analyzed.

[0052] In one embodiment, the process for obtaining the drainage situation on the outer wall surface of the pipeline 2 to be measured is as follows. The driving motor 41 is started to drive the driving gear 42 connected thereto to rotate. The driving gear 42 meshes with the tooth-shaped structure 51 provided on the rotating disk 5 to drive the rotating disk 5 to rotate along the axial direction of the pipeline 2 to be measured. The image acquisition module 33 acquires the image of the outer wall surface of the pipeline 2 to be measured, and then outputs the acquired image to the processor 82 through a signal line. The processor 82 processes the image and transmits it to the controller 84. Then, the controller 84 transmits the image to the display screen 85, enabling the inspection personnel to directly observe the drainage situation on the outer wall surface of the pipeline 2 to be measured from the display screen 85. The image acquisition module 33 can be an industrial camera for high-precision image acquisition and detection operations.

[0053] The drainage grounding device for the power line adjacent to the natural gas pipeline may further include a connecting sleeve 6. The connecting sleeve 6 is fixedly arranged on the outer wall surface of the pipeline to be measured 2 and is connected to the guiding ring 34. The connecting sleeve 6 is provided with through holes for the signal lines of the image acquisition module 33 and the signal lines of multiple current signal detectors 1 to pass through. The setting of the connecting sleeve 6 can accommodate multiple signal lines and reduce the occupied space. A multi-channel plug 62 is connected to the lower part of the connecting sleeve 6. Multiple signal lines are respectively connected to the multi-channel plug 62, and a multi-channel wire 61 connected to the processing system 8 and the multi-channel plug 62 is also installed inside the connecting sleeve 6. By using the electrical connection among multiple signal lines, the multi-channel wire 61, the multi-channel plug 62 and the processing system 8, the detection results at different positions can be output to the display screen 85 and the communicator 86. To enhance the sealing effect at the connection, sealing packing is arranged inside the connecting sleeve 6, and the connection between the multi-channel plug 62 and multiple signal lines needs to be sealed.

[0054] The drainage grounding device for the power line adjacent to the natural gas pipeline may further include a first limit switch and a second limit switch. The first limit switch and the second limit switch are respectively arranged at the first position and the second position of the guiding ring 34. The first position and the second position are located on both sides of the connecting sleeve 6. The first limit switch is used to monitor whether the image acquisition module 33 moves to the first position, and the second limit switch is used to monitor whether the image acquisition module 33 moves to the second position, so as to prevent the image acquisition module 33 from still moving along the original moving direction after moving to the first position or the second position, and thus colliding with the connecting sleeve 6. To realize the monitoring of the position of the image acquisition module 33 by the first limit switch and the second limit switch, a first static contact and a second static contact are respectively arranged inside the first limit switch and the second limit switch. A moving contact capable of mutually identifying with the first static contact and the second static contact is arranged on the fixed rod 35. When the fixed rod 35 slides to make the moving contact contact with the first static contact, the first limit switch can send a signal to the driving component 4 to stop the driving process of the rotating disk 5 and prevent the fixed rod 35 from continuing to approach one side of the connecting sleeve 6. When the moving contact contacts with the second static contact, the second limit switch can send a signal to the driving component 4 to stop the driving process of the rotating disk 5 and prevent the fixed rod 35 from continuing to approach the other side of the connecting sleeve 6. The setting of the first limit switch and the second limit switch can conveniently and timely send signals to the driving component 4, stop the driving process of the driving component 4 and timely adjust the driving direction of the driving component 4, limit the moving range of the image acquisition module 33, so as to prevent the image acquisition module 33 from colliding with the connecting sleeve 6 during the image acquisition process and ensure the smooth progress of the image acquisition process. Changing the driving direction is also beneficial to avoiding the problem of signal line entanglement that is likely to occur when the image acquisition module 33 moves in the same direction for a long time.

[0055] The present invention also provides a drainage method for a drainage grounding device for a power line adjacent to a natural gas pipeline. The drainage situation of a pipeline to be measured 2 is detected by using the drainage grounding device for a power line adjacent to a natural gas pipeline described above, including the following steps: The drainage grounding device for a power line adjacent to a natural gas pipeline is installed in advance in an area vulnerable to stray current corrosion (such as an area close to a high-voltage line or a track section, etc.), that is, a conductive pipe 31 is sleeved outside the pipeline to be measured 2, and a soil simulation filler layer 32 is arranged inside the conductive pipe 31 to simulate the real drainage situation of the pipeline to be measured 2 in a soil environment, and a plurality of current signal detectors 1 are arranged inside the pipeline to be measured 2. Affected by stray current, electrochemical corrosion gradually occurs on the inner and outer wall surfaces of the pipeline to be measured 2. At this time, the current signal inside the pipeline to be measured 2 is detected by the current signal detector 1, and by comparing the distribution differences (such as waveform, frequency, amplitude characteristics, etc.) of the current signal images processed by the processing system 8, the drainage situation inside the pipeline to be measured 2 can be judged. The image of the outer wall surface of the pipeline to be measured 2 is collected through the activity process of the image acquisition module 33. After being processed by the processing system 8, the detection personnel can visually obtain the images of the inner and outer wall surfaces of the pipeline to be measured 2 on the display screen 85 or the communicator 86, and the drainage situation of the pipeline to be measured 2 is comprehensively evaluated by judging the drainage situations of the inner and outer wall surfaces of the pipeline to be measured 2. In addition, since the drainage methods for the inner and outer wall surfaces of the pipeline to be measured 2 are different, even for the situation where the outer diameter of the buried pipeline is large or the span of stray current corrosion is wide, the detection results obtained by using the above drainage method are still representative, and the detection results are reliable and accurate.

[0056] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A drainage grounding device for a power line adjacent to a natural gas pipeline, characterized in that: include: A current signal detector (1), wherein a plurality of the current signal detectors (1) are arranged inside the pipeline (2) to be tested, and the plurality of the current signal detectors (1) are used to detect the current signal inside the pipeline (2) to be tested, so as to obtain the internal drainage condition of the pipeline (2) to be tested; An external detection component (3), the external detection component (3) comprising a conductive tube (31), a soil simulation filler layer (32) and an image acquisition module (33), the conductive tube (31) being sleeved on the outside of the pipeline (2) to be detected and the two ends of the conductive tube (31) being sealed and connected to the pipeline (2) to be detected; the soil simulation filler layer (32) being arranged in the conductive tube (31) and the internal filler being a transparent conductive filler, the conductive properties of the conductive tube (31) and the soil simulation filler layer (32) being weaker than the conductive properties of the pipeline (2) to be detected; the image acquisition module (33) being arranged in the conductive tube (31) and being movably connected to the pipeline (2) to be detected, the image acquisition module (33) being used to acquire an image of the outer wall surface of the pipeline (2) to be detected.

2. The drainage grounding device for a power line adjacent to a natural gas pipeline according to claim 1, characterized in that: The external detection component (3) further comprises a guide ring (34) and a fixed rod (35); the guide ring (34) is arranged on the outer wall surface of the pipeline (2) to be detected; the fixed rod (35) is slidably arranged on the guide ring (34); the image acquisition module (33) is arranged on the fixed rod (35); the fixed rod (35) can slide along the guide ring (34) to drive the image acquisition module (33) to move along the outer wall surface of the pipeline (2) to be detected.

3. The drainage grounding device for a power line adjacent to a natural gas pipeline according to claim 2, characterized in that: The power line adjacent to the natural gas pipeline drainage grounding device also includes a driving component (4) and a rotating disk (5), wherein the rotating disk (5) is rotatably connected to the outer wall surface of the pipeline to be tested (2), and the fixing rod (35) is arranged on the rotating disk (5). The driving component (4) can drive the rotating disk (5) to rotate, so as to drive the fixing rod (35) to slide along the guide ring (34).

4. The drainage grounding device for a power line adjacent to a natural gas pipeline according to claim 3, characterized in that: The driving assembly (4) comprises a driving motor (41) and a driving gear (42); the rotating disk (5) is provided with a toothed structure (51) capable of meshing with the driving gear (42); the driving motor (41) is capable of driving the driving gear (42) to rotate, thereby driving the rotating disk (5) to rotate along the axis of the pipeline (2) to be tested.

5. The drainage grounding device for a power line adjacent to a natural gas pipeline according to claim 2, characterized in that: The power line adjacent to the natural gas pipeline drainage grounding device also includes a connecting sleeve (6), the connecting sleeve (6) is arranged on the outer wall surface of the pipeline to be tested (2) and is connected to the guide ring (34), and the connecting sleeve (6) is provided with a through hole for the signal line of the image acquisition module (33) and the signal lines of the multiple current signal detectors (1) to pass through.

6. The drainage grounding device for a power line adjacent to a natural gas pipeline according to claim 5, characterized in that: The power line adjacent to the natural gas pipeline drainage grounding device also includes a first limit switch and a second limit switch, the first limit switch and the second limit switch are respectively arranged at a first position and a second position of the guide ring (34), the first position and the second position are located on both sides of the connecting sleeve (6), the first limit switch is used to monitor whether the image acquisition module (33) moves to the first position, and the second limit switch is used to monitor whether the image acquisition module (33) moves to the second position.

7. The drainage grounding device for a power line adjacent to a natural gas pipeline according to claim 1, characterized in that: The external detection component (3) further comprises a transparent insulating partition (36), wherein the transparent insulating partition (36) is arranged in the conductive tube (31) and is respectively sealed and connected to the conductive tube (31) and the pipeline to be detected (2), wherein the transparent insulating partition (36) separates the conductive tube (31) into a first chamber and a second chamber, wherein the image acquisition module (33) is arranged in the first chamber, and the soil simulation filler layer (32) is filled and arranged in the second chamber.

8. The drainage grounding device for a power line adjacent to a natural gas pipeline according to claim 1, characterized in that: The power line adjacent to the natural gas pipeline drainage grounding device further comprises an insulating tube (7), the insulating tube (7) being arranged inside the pipeline to be tested (2), the insulating tube (7) being connected to the fluid passage of the pipeline to be tested (2), and the outer wall surfaces of the pipe openings on both sides of the insulating tube (7) being sealedly connected to the inner wall surface of the pipeline to be tested (2), and a plurality of the current signal detectors (1) being arranged on the outer peripheral side of the insulating tube (7).

9. The drainage grounding device for a power line adjacent to a natural gas pipeline according to claim 1, characterized in that: The power line adjacent to the natural gas pipeline drainage grounding device also includes a processing system (8), and the processing system (8) is electrically connected to the current signal detector (1) and the image acquisition module (33) respectively to respectively obtain and output the drainage conditions inside and outside the pipeline (2) to be tested.

10. A method for draining a power line adjacent to a natural gas pipeline drain grounding device, characterized in that: Using the drainage grounding device for a power line adjacent to a natural gas pipeline as described in any one of claims 1 to 9 to detect the drainage condition of the pipeline (2) to be tested comprises the following steps: A conductive tube (31) and a soil simulation filler layer (32) are arranged outside the pipeline to be tested (2) to simulate the actual drainage condition of the pipeline to be tested (2) in a soil environment; Under the influence of stray current, the pipeline to be tested (2) undergoes electrochemical corrosion; The current signal inside the pipeline (2) to be tested is detected by using a current signal detector (1), and the difference of the current signals of multiple current signal detectors (1) is compared to obtain the drainage condition inside the pipeline (2) to be tested; An image of the outer wall surface of the pipeline (2) to be tested is collected by the image collection module (33) to obtain the drainage condition of the outer wall surface of the pipeline (2) to be tested.

Images