A probe for detecting voltage gradients on buried pipelines

Abstract

The application relates to a probe for detecting a buried pipeline voltage gradient, which comprises a probe main body, a probe head assembly, a locking positioning part, an aviation plug and a switch button; the probe main body comprises an outer pipe and an inner pipe, a part of the lower end of the inner pipe is an installation section, the installation section is located outside the outer pipe, and the probe head assembly is installed on the installation section; the upper end of the inner pipe is located inside the outer pipe, and the upper end of the inner pipe is tightly fixed with the inner side wall of the outer pipe through the locking positioning part; a part of the upper end of the outer pipe is an assembly section, the assembly section and the upper end of the inner pipe are arranged in the respective axial directions and are spaced apart, a sleeve is arranged on the assembly section, and the free end of the sleeve is provided with the switch button; the aviation plug is arranged on a section between the assembly section and the inner pipe of the outer pipe; the probe head assembly is electrically connected with the aviation plug through cables, and the aviation plug is electrically connected with the switch button. The application realizes the collection of alternating voltage gradient and direct current voltage gradient at the same time in the detection outside the buried pipeline, reduces the labor intensity, improves the detection efficiency, and obtains more current pipeline information.

Description

Technical Field

[0001] This invention relates to pipeline corrosion detection equipment, specifically to a probe for detecting voltage gradients in buried pipelines. Background Technology

[0002] Currently, the detection methods for external corrosion of buried pipelines are divided into the AC voltage gradient method (ACVG) and the DC voltage gradient method (DCVG / CIPS). While both methods can detect external corrosion, the AC method primarily uses an A-frame with appropriate equipment to determine the location and size of damage to the pipeline's anti-corrosion layer; the DC method primarily uses probes with appropriate equipment to detect the DC voltage gradient and cathodic protection potential of the buried pipeline, accurately locate defect points, and test the pipeline's activity. Typically, the two detection devices are used relatively independently, but their functions can mutually verify and complement each other. Summary of the Invention

[0003] In order to solve one or more of the above-mentioned technical problems, the present invention provides a probe for detecting voltage gradients in buried pipelines.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a probe for detecting voltage gradient of buried pipeline, comprising a probe body, a probe assembly, a locking and positioning part, an aviation plug and a switch button;

[0005] The probe body includes an outer tube and an inner tube fitted inside the outer tube. A portion of the lower end of the inner tube is an installation section, which is located outside the outer tube. A probe assembly is installed on the installation section.

[0006] The upper end of the inner tube is located inside the outer tube, and the upper end of the inner tube is pressed and fixed to the inner wall of the outer tube by a locking and positioning part; a portion of the upper end of the outer tube is an assembly section, and the assembly section and the upper end of the inner tube are arranged axially at intervals. A sleeve is provided on the assembly section, and a switch button is installed on the free end of the sleeve.

[0007] An aviation plug is provided on a section of the outer tube located between the assembly section and the inner tube; the probe assembly is electrically connected to the aviation plug via cables, and the aviation plug is electrically connected to the switch button.

[0008] The beneficial effects of this invention are: the probe of this invention can collect voltage gradients in the external inspection of buried pipelines, reduce labor intensity, improve inspection efficiency, and obtain more current pipeline information.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the probe assembly includes a probe fixing tube, a conductive post, and a reference electrode. The probe fixing tube is sleeved on the mounting section of the inner tube, and the conductive post is provided in the mounting section of the inner tube. The probe fixing tube, the mounting section, and the conductive post are fixedly connected by screws. The reference electrode is disposed on the conductive post and is electrically connected to the conductive post. The conductive post is electrically connected to an aviation plug via a cable.

[0011] Furthermore, a limiting ring is provided at the lower end of the outer tube. The limiting ring is sleeved on the lower end of the outer tube and is interference-fitted with the outer side wall of the outer tube. One end of the limiting ring is provided with an inner ring edge. The lower end of the outer tube abuts against the inner ring edge, and the inner ring side wall of the inner ring edge abuts against the outer side wall of the mounting section.

[0012] Furthermore, the locking and positioning part includes an expansion core, a rotating locking shaft, an expansion ring, and a nut. One end of the rotating locking shaft is inserted into and fixed to the upper end of the inner tube, and an installation gap is reserved between the rotating locking shaft and the inner wall of the upper end of the inner tube. One end of the expansion core is sleeved and inserted into the installation gap. The expansion core, the inner tube, and the rotating locking shaft are fixedly connected by rivets. The main body of the expansion core is located inside the outer tube. The main body of the expansion core is sleeved with a nut and an expansion ring. The expansion ring is sleeved on the outside of the nut and is pressed and fixed against the inner wall of the outer tube.

[0013] Furthermore, an O-ring is also fitted on the outer side of the expansion ring.

[0014] Furthermore, the nut is a square nut.

[0015] Furthermore, the other end of the expansion core is located outside the expansion ring, and an E-type open snap ring is also snapped onto the outer wall of the expansion core near its other end.

[0016] Furthermore, the outer wall of the inner tube is provided with multiple sets of rivets, each set of rivets including two radially opposite rivets, the rivet head of the rivet is located between the inner tube and the outer tube, and the rivet part of the rivet passes through the inner tube and is located inside the inner tube.

[0017] Furthermore, an aviation heat shrink tubing is fitted onto a section of the outer tube located between the assembly section and the inner tube. An aviation heat shrink tubing is provided with an aviation mounting plate, and an aviation plug is provided on the aviation mounting plate.

[0018] Furthermore, a button retaining ring is interference-fitted on the inner wall of the free end of the sleeve, and the button of the switch 5 is plugged into and installed on the button retaining ring. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main view of the probe used to detect voltage gradients in buried pipelines according to the present invention.

[0020] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0021] 0 Figure 3 for Figure 2 Enlarged structural diagram of section IV;

[0022] Figure 4 for Figure 2 Enlarged structural diagram of section III;

[0023] Figure 5 for Figure 2 Enlarged structural diagram of Part I;

[0024] Figure 6 for Figure 2 Enlarged structural diagram of section II;

[0025] Figure 7 for Figure 1 Enlarged structural diagram of section V.

[0026] The following is a list of components represented by each number in the attached diagram:

[0027] 1. Sleeve; 2. Button retaining ring; 3. Switch button; 4. Aviation plug heat shrink tubing; 5. Outer tube; 6. E-type open snap ring; 7. Expansion ring; 8. O-ring; 9. Expansion core; 10. Rivet; 11. Limiting ring; 12. Inner tube; 13. Probe fixing tube; 14. Aviation plug; 15. Aviation plug mounting plate; 16. Nut; 17. Rotary locking shaft; 18. Pan head screw; 19. Screw; 20. Conductive post. Detailed Implementation

[0028] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0029] like Figures 1 to 7 As shown, a probe for detecting voltage gradient in buried pipelines according to this embodiment includes a probe body, a probe assembly, a locking and positioning part, an aviation plug, and a switch button.

[0030] The probe body includes an outer tube 5 and an inner tube 12 fitted inside the outer tube 5. A portion of the lower end of the inner tube 12 is an installation section, which is located outside the outer tube 5. A probe assembly is installed on the installation section.

[0031] The upper end of the inner tube 12 is located inside the outer tube 5. The upper end of the inner tube 12 is pressed and fixed to the inner wall of the outer tube 5 by a locking and positioning part. A portion of the upper end of the outer tube 5 is an assembly section. The assembly section and the upper end of the inner tube 12 are arranged axially at intervals. A sleeve 1 is provided on the assembly section. A switch button 3 is installed on the free end of the sleeve 1.

[0032] The outer tube 5 is provided with an aviation plug 14 on a section between the assembly section and the inner tube 12; the probe assembly is electrically connected to the aviation plug 14 via cables, and the aviation plug 14 is electrically connected to the switch button 3.

[0033] like Figure 1 and Figure 3 As shown, the probe assembly in this embodiment includes a probe fixing tube 13, a conductive post 20, and a reference electrode. The probe fixing tube 13 is sleeved on the mounting section of the inner tube 12, and the conductive post 20 is provided in the mounting section of the inner tube 12. The probe fixing tube 13, the mounting section, and the conductive post 20 are fixedly connected by screws 19. The reference electrode is disposed on the conductive post 20 and is electrically connected to the aviation plug 14 through a cable.

[0034] like Figure 3 As shown, the upper end of the conductive post 20 in this embodiment is provided with a pan head screw 18, and an open copper nickel-plated terminal is connected to the pan head screw 18. The open copper nickel-plated terminal is used to connect the cable to the aviation plug 14 for electrical connection.

[0035] like Figure 3 As shown, in this embodiment, the lower end of the outer tube 5 is provided with a limiting ring 11. The limiting ring 11 is sleeved on the lower end of the outer tube 5 and is interference-fitted with the outer side wall of the outer tube 5. One end of the limiting ring 11 is provided with an inner ring edge. The lower end of the outer tube 5 abuts against the inner ring edge, and the inner ring side wall of the inner ring edge abuts against the outer side wall of the mounting section.

[0036] like Figure 4 As shown, the locking and positioning part of this embodiment includes an expansion core 9, a rotating locking shaft 17, an expansion ring 7, and a nut 16. One end of the rotating locking shaft 17 is inserted into and fixed to the upper end of the inner tube, and an installation gap is reserved between the rotating locking shaft 17 and the inner wall of the upper end of the inner tube 12. One end of the expansion core 9 is sleeved and inserted into the installation gap. The expansion core 9, the inner tube 12, and the rotating locking shaft 17 are fixedly connected by rivets 10. The main body of the expansion core 9 is located inside the outer tube 5. The main body of the expansion core 9 is sleeved with a nut 16 and an expansion ring 7. The expansion ring 7 is sleeved outside the nut 16 and pressed and fixed to the inner wall of the outer tube 5. When one end of the expansion core 9 is sleeved and inserted into the installation gap, the expansion core 9 will be squeezed and fixed in the installation gap.

[0037] like Figure 4 As shown, in this embodiment, an O-ring 8 is also fitted on the outer side of the expansion ring 7.

[0038] Specifically, the nut 16 is a square nut. When the reference electrode is inserted into the conductive post, it exerts a certain force on the inner tube, causing axial expansion and contraction relative to the outer tube. By providing an expansion core 9 on the inner tube and an expansion ring around the expansion core 9, axial sliding of the inner tube relative to the outer tube can be prevented. Furthermore, a friction plate can be provided between the expansion core 9 and the outer tube to further increase the friction between them. The nut 16 is fitted onto the expansion core 9 and tightly fitted thereto. The expansion ring 7 can then be fitted onto the outside of the nut 16 and has an annular groove that matches the shape of the nut 16. This structurally limits the expansion ring 7 using the nut 16, and the expansion ring 7 is tightly fitted against the inner wall of the outer tube, thus limiting the expansion core 9.

[0039] like Figure 4 As shown, in this embodiment, the other end of the expansion core 9 is located outside the expansion ring 7, and an E-type open snap ring 6 is also snapped onto the outer side wall of the expansion core 9 near its other end.

[0040] like Figure 7 As shown, in this embodiment, the outer wall of the inner tube 12 is also provided with multiple sets of rivets 10. Each set of rivets 10 includes two rivets 10 arranged radially opposite each other. The rivet head of the rivet 10 is located between the inner tube 12 and the outer tube 5, and the rivet part of the rivet 10 passes through the inner tube 12 and is located inside the inner tube 12.

[0041] like Figure 1 and Figure 6 As shown, in this embodiment, the outer tube 5 is fitted with an aviation heat shrink tubing 4 on a section between the assembly section and the inner tube 12. The aviation heat shrink tubing 4 is provided with an aviation mounting plate 15, and the aviation mounting plate 15 is provided with an aviation plug 14.

[0042] like Figure 5 As shown, in this embodiment, a button retaining ring 2 is interference-fitted on the inner wall of the free end of the sleeve 1, and the switch button 3 is inserted and installed on the button retaining ring 2.

[0043] In this embodiment, the reference electrode can be a saturated copper sulfate solution reference electrode, the mounting plate can be made of aluminum alloy, and the sleeve is made of foam for easy carrying and use by the operator. Both the inner and outer tubes are made of carbon fiber tubing.

[0044] In this embodiment, two probes can be used together. The aviation connectors of the two probes are connected in series via a data cable and then connected to the processor. They are used sequentially to measure voltage gradients. The probe's detection principle is as follows: A reference electrode is installed in the probe mounting tube (fixed by a screw rotation), and a cable within the probe is connected to the aviation connector. When the anti-corrosion layer of a buried pipeline is damaged, a leaking potential gradient field is formed on the ground. The reference electrode contains a saturated copper sulfate solution. When the reference electrode is inserted into the soil, the current in the soil flows into the reference electrode. The reference electrode and the probe mounting tube are metal-connected. The current is transmitted to the aviation connector via a connecting conductor and internal cable, and then from the aviation connector to the processor, where the processor acquires the signal.

[0045] The probe in this embodiment can simultaneously collect AC voltage gradient and DC voltage gradient during the external inspection of buried pipelines, reducing labor intensity, improving inspection efficiency, and obtaining more current pipeline information.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A probe for detecting voltage gradients in buried pipelines, characterized in that, Includes probe body, probe assembly, locking and positioning part, aviation plug and switch button; The probe body includes an outer tube and an inner tube fitted inside the outer tube. A portion of the lower end of the inner tube is an installation section, which is located outside the outer tube. A probe assembly is installed on the installation section. The upper end of the inner tube is located inside the outer tube, and the upper end of the inner tube is pressed and fixed to the inner wall of the outer tube by a locking and positioning part; a portion of the upper end of the outer tube is an assembly section, and the assembly section and the upper end of the inner tube are arranged axially at intervals. A sleeve is provided on the assembly section, and a switch button is installed on the free end of the sleeve. An aviation plug is provided on a section of the outer tube between the assembly section and the inner tube; the probe assembly is electrically connected to the aviation plug via cables, and the aviation plug is electrically connected to the switch button. The locking and positioning part includes an expansion core, a rotating locking shaft, an expansion ring, and a nut. One end of the rotating locking shaft is inserted into and fixed to the upper end of the inner tube, and an installation gap is reserved between the rotating locking shaft and the inner wall of the upper end of the inner tube. One end of the expansion core is sleeved and inserted into the installation gap. The expansion core, the inner tube, and the rotating locking shaft are fixedly connected by rivets. The main body of the expansion core is located inside the outer tube. The main body of the expansion core is sleeved with a nut and an expansion ring. The expansion ring is sleeved on the outside of the nut and is pressed and fixed against the inner wall of the outer tube. The probe assembly includes a probe fixing tube, a conductive post, and a reference electrode. The probe fixing tube is sleeved on the mounting section of the inner tube, and the conductive post is provided inside the mounting section of the inner tube. The probe fixing tube, the mounting section, and the conductive post are fixedly connected by screws. The reference electrode is disposed on the conductive post and is electrically connected to the conductive post. The conductive post is electrically connected to an aviation plug via a cable. The lower end of the outer tube is provided with a limiting ring. The limiting ring is sleeved on the lower end of the outer tube and is interference-fitted with the outer side wall of the outer tube. One end of the limiting ring is provided with an inner ring edge. The lower end of the outer tube abuts against the inner ring edge, and the inner ring side wall of the inner ring edge abuts against the outer side wall of the mounting section. An O-ring is also fitted on the outer side of the expansion ring; the nut is a square nut; the other end of the expansion core is located outside the expansion ring, and an E-type open snap ring is also snapped onto the outer wall of the expansion core near its other end; multiple sets of rivets are also provided on the outer wall of the inner tube, each set of rivets including two radially opposite rivets, the rivet head of the rivet is located between the inner tube and the outer tube, and the rivet part passes through the inner tube and is located inside the inner tube.

2. The probe for detecting voltage gradient in buried pipelines according to claim 1, characterized in that, The outer tube is fitted with an aviation heat shrink tubing on a section between the assembly section and the inner tube. The aviation heat shrink tubing is provided with an aviation mounting plate, and the aviation mounting plate is provided with an aviation plug.

3. The probe for detecting voltage gradient in buried pipelines according to claim 1, characterized in that, A button retaining ring is interference-fitted on the inner wall of the free end of the sleeve, and the switch button is plugged into and installed on the button retaining ring.

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