Hidden self-detection test box for cathode protection

Abstract

The invention relates to the technical field of pipeline protection, and particularly discloses a concealed self-detection test box for cathode protection, which comprises a body, the body is provided with an accommodating chamber with a top opening, the inner wall of the accommodating chamber is provided with a test terminal, the test terminal is connected with a pipeline through a test cable, and the accommodating chamber is internally provided with a test pipeline extending out of the body; the cover plate covers the top of the body through a connecting piece, and the upper surface of the cover plate is flush with the road surface; and the self-detection module located in the accommodating chamber is installed at the bottom of the accommodating chamber, the self-detection module is electrically connected with the cathode protection unit through a cable, and the self-detection module is electrically connected with the test terminal.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline protection, in particular to a concealed self-detection test box for cathode protection. Background Art

[0002] Cathodic protection technology has been widely used in many engineering fields such as buried pipelines, marine engineering, bridges and tunnels, providing basic guarantees for the long life of various facilities. In practical applications, cathodic protection technology usually evaluates the effect of cathodic protection by measuring relevant parameters such as cathodic protection potential. The detection and evaluation of cathodic protection effects are usually carried out through test piles reserved on site. However, for some factory areas with densely populated equipment or urban roads that require cleanliness, it is impossible to reserve test piles. Without test piles, it is impossible to test and accumulate daily data of cathodic protection, which brings troubles to the maintenance of cathodic protection units. Summary of the invention

[0003] In order to solve the above problems, the present application provides a concealed self-detection test box for cathodic protection, which is installed in the form of a concealed test box. The test box can be installed in a valve well or on a hardened road surface, flush with the road surface, ensuring the concealment of the test point, avoiding exposure of the test pile on the surface, and reducing the possibility of human damage or destruction; installation in a hardened road surface or valve well can effectively utilize the existing space and reduce the impact on the surface landscape or use;.

[0004] The present application provides a concealed self-detection test box for cathodic protection, comprising: A body, wherein the body has a receiving chamber with a top opening, a test terminal is arranged on the inner wall of the receiving chamber, the test terminal is connected to the pipeline through a test cable, and a test pipeline extending out of the body is arranged in the receiving chamber; A cover plate, the cover plate is covered on the top of the body through a connecting piece, and the upper surface of the cover plate is flush with the road surface; A self-detection module is located in the accommodation chamber and is installed at the bottom of the accommodation chamber. The self-detection module is electrically connected to the cathode protection unit through a cable, and the self-detection module is electrically connected to the test terminal.

[0005] In one embodiment, the self-test module includes a self-test housing and a detection mainboard disposed in the self-test housing; The outer periphery of the self-test housing is provided with a connecting ear and three wiring terminals, the connecting ear is installed on the bottom of the accommodation chamber by fixing bolts, the three wiring terminals are respectively connected to the anode cable, the reference cable and the test cable, and the anode cable and the reference cable are electrically connected to the cathodic protection unit; The detection mainboard is electrically connected to each of the connection terminals via a wire.

[0006] In one embodiment, the detection mainboard is provided with an alarm penetrating through the top of the self-test housing; The cover plate is provided with a transparent plate for observing the alarm.

[0007] In one embodiment, a buffer gasket is provided between the self-test housing and the cover plate.

[0008] In one embodiment, a cement base is installed at the bottom of the body to isolate external electrical signals.

[0009] In one embodiment, the cement base is provided with a first inlet gland and a second outlet gland connected to the accommodation chamber; The test cable enters the accommodation chamber through the first inlet gland; The anode cable and the reference cable enter the containing chamber through the second conducting gland.

[0010] In one embodiment, one end of the test pipeline passes through the cement base and is covered by a nylon mesh, and the other end is closed by a test end cover, and the test cover is pressed against the top of the test pipeline by the cover plate.

[0011] In one embodiment, a rubber gasket is provided between the top of the body and the cover plate to increase the sealing between the body and the cover plate.

[0012] In one embodiment, the cathodic protection unit includes a magnesium alloy anode electrically connected to the anode cable, a copper rod electrically connected to the reference cable, and a filler bag is wrapped around the periphery of the magnesium alloy anode plate.

[0013] In one embodiment, the connecting member comprises a cover bolt; The cover plate is provided with an upper connection hole for installing the cover plate bolts; The top of the body is provided with a lower connection hole corresponding to the upper connection hole; The cover plate bolt passes through the upper connection hole and connects to the lower connection hole to press the cover plate onto the body.

[0014] Compared with the prior art, the present application has the following beneficial effects: The concealed self-detection test box provided in this application is arranged on the pipeline route. The interval between adjacent concealed self-detection test boxes should not be greater than 3km, and should be appropriately increased in the area affected by stray current interference. The main body is placed in the valve well or road surface, and the cover plate is covered on the top of the main body through a connector, and the upper surface of the cover plate is flush with the road surface, ensuring the concealment of the test point, avoiding the test pile from being exposed on the surface, and reducing the possibility of human damage or destruction; installation in hardened road surface or valve well can effectively utilize the existing space and reduce the impact on the surface landscape or use; the above-mentioned installation position can usually provide a relatively stable environment, reducing the impact of external factors such as temperature and humidity on the test box. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a cross-sectional schematic diagram of the concealed self-detection test box in this application.

[0017] Figure 2 for Figure 1 Schematic diagram of the cross section of section AA.

[0018] Figure 3 for Figure 1 Schematic diagram of the cross-section of the middle BB section.

[0019] Figure 4 It is a cross-sectional schematic diagram of the self-detection module in this application.

[0020] Figure 5 This is a circuit working principle diagram of the self-test module in this application. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] The terms "first", "second", "third", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0025] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0026] like Figure 1 As shown, the present application provides a concealed self-detection test box for cathodic protection, including: a body 6, the body 6 has a receiving chamber 61 with a top opening, a test terminal 22 is provided on the inner wall of the receiving chamber 61, the test terminal 22 is connected to the pipeline 15 through a test cable 17, and a test pipeline 21 extending from the body 6 is provided in the receiving chamber 61; a cover plate 1, the cover plate 1 is covered on the top of the body 6 through a connector, and the upper surface of the cover plate 1 is flush with the road surface; a self-detection module 7, the self-detection module 7 located in the receiving chamber 8 is installed at the bottom of the receiving chamber 61, the self-detection module 7 is electrically connected to the cathodic protection unit through a cable, and the self-detection module 7 is electrically connected to the test terminal 22. In this embodiment, a welding point 16 is provided on the pipeline 15 for connecting the end of the test cable 17.

[0027] In actual use, the concealed self-detection test box provided by the present application is arranged along the pipeline route, and the interval between adjacent concealed self-detection test boxes should not be greater than 3km, and should be appropriately increased in the area affected by stray current interference. Specifically, the main body 6 is placed in a valve well or road surface, and the cover plate 1 is covered on the top of the main body 6 through a connector, and the upper surface of the cover plate 1 is flush with the road surface, ensuring the concealment of the test point, avoiding the test pile from being exposed on the surface, and reducing the possibility of human damage or destruction; installation in a hardened road surface or valve well can effectively utilize the existing space and reduce the impact on the surface landscape or use; the above-mentioned installation position can usually provide a relatively stable environment, reducing the impact of external factors such as temperature and humidity on the test box.

[0028] like Figures 2 to 4 As shown in a specific example provided by the present application, the self-test module 7 includes a self-test housing 28 and a detection mainboard 27 disposed in the self-test housing 28; the outer periphery of the self-test housing 28 is provided with a connecting ear 281 and three wiring terminals 25, which are fixed by a fixing bolt 20 (see Figure 1 ) Install the connecting ear 281 at the bottom of the receiving chamber 61, and the three terminals are respectively connected to the anode cable 11, the reference cable 10 and the test cable 17. The anode cable 11 and the reference cable 10 are electrically connected to the cathodic protection unit; the detection main board 27 and each terminal 25 are electrically connected through a wire. For details, see Figure 4 As shown, a triode 29 is installed on the detection main board 27, and the two wiring terminals 25 connected to the anode cable 11 and the reference cable 10 are respectively electrically connected to the two N ends of the triode 29, and the wiring terminal connected to the test cable 17 is electrically connected to the P end of the triode 29. It should be noted that after the triode 29 is electrically connected, a polyurethane filler 30 is filled in the self-test housing 28. like Figure 4 As shown, in a specific example provided by the present application, an alarm 32 passing through the top of the self-test housing 28 is provided on the detection main board 27; and a transparent plate 2 for observing the alarm 32 is provided on the cover plate 1. Specifically, the alarm 32 is an indicator light or a buzzer, and the transparent plate 2 is an acrylic plate. In this embodiment, the self-test housing 28 has a top plate 26 and a floor 31, and the alarm 32 passes through the top plate 26 and extends out of the housing 28. It can be understood that during the daily inspection, the working status of the alarm 32 can be observed through the transparent acrylic plate without opening the cover plate 1, thereby reducing the workload during the maintenance process and improving the efficiency of daily maintenance.

[0029] like Figure 5As shown, a circuit working principle diagram of a self-test module 7 is provided, and the corresponding specifications of the transistor 29 are selected so that the saturation voltage is maintained at 0.8v (the specifications of the transistor can be adjusted and replaced according to the actual situation of the cathode protection), and the reference cable 10 led out of the copper rod 12 is connected to the N pole (C) of the transistor 29, and the anode cable 11 led out of the magnesium alloy anode 14 is connected to the two N poles (E) of the transistor 29. The P pole (B) of the transistor 29 is electrically connected to the protection pipeline 15 through the electrically connected test cable 17, and the cathode protection potential is fed back. Since the potential of the magnesium alloy anode 14 is ≤-1.6v when buried, when the pipeline protection potential is higher than -0.80v (vs Cu / CuSO4 reference electrode), the transistor is turned on at this time, and finally the magnesium alloy rod 4 and the copper rod 5 are turned on to form a primary battery. The alarm 32 (indicator bead / buzzer) in the self-test module is powered by the primary battery and the alarm (light / sound) is generated, that is, the self-test function is realized.

[0030] It can be understood that the working state of the self-test module 7 is in a normal state: under normal circumstances, the cathodic protection unit of the pipeline 15 maintains its normal function, that is, the protection potential of the pipeline 15 is maintained below the standard protection potential (usually required to be ≤-0.80v vs Cu / CuSO4 reference electrode). During this period, the triode 29 in the self-test module is not conducting, so the alarm 32 (indicator bead / buzzer) will not issue a light / sound alarm. In abnormal state: when the protection potential of the pipeline is higher than -0.80v, it indicates that there is a problem with the cathodic protection effect of the pipeline 15, and the pipeline may be at risk of corrosion; in this case, the specification setting of the transistor 29 is such that when the pipeline protection potential reaches or exceeds -0.80v, the transistor 29 will be turned on (entering a saturation state), that is, the voltage drop between its collector and emitter will become very small, close to the saturation voltage (usually 0.8v); after the transistor 29 is turned on, the copper rod tail cable 10 and the anode tail cable 11 form a current path through the two N poles (C and E) of the transistor 29, and the P pole (B) of the transistor is connected to the fixing plate 27, so that the pipeline cable 17 and the pipeline 15 maintain electrical connection; through this connection, the potential difference between the copper rod and the magnesium alloy anode forms a primary battery, generating sufficient current to drive the alarm 32 (indicator bead / buzzer) to work, thereby issuing a light / sound alarm.

[0031] Furthermore, if Figure 1 As shown, in a specific example provided by the present application, a buffer gasket 3 is provided between the self-test housing 28 and the cover plate 1. It is understandable that the buffer gasket 3 can reduce the physical impact or pressure caused by vibration, temperature change or other external forces between the cover plate 1 and the body 6. This helps to prevent damage to the internal circuits, components and connection points, and prolong the service life of the device.

[0032] like Figure 1As shown, in a specific example provided by the present application, a cement base 9 is installed at the bottom of the body 6 to isolate external electrical signals. Specifically, the cement base 9 is provided with a first inlet gland 191 and a second outlet gland 192 connected to the accommodation chamber 61; the test cable 17 enters the accommodation chamber 61 through the first inlet gland 191; the anode cable 11 and the reference cable 10 enter the accommodation chamber 61 through the second outlet gland 192. It is worth mentioning that in this embodiment, the inner bottom of the accommodation chamber is encapsulated with epoxy resin 8 to prevent water leakage.

[0033] It can be understood that the cement base 9 can limit the installation position of the first incoming line gland 191 and the second outgoing line gland 192, ensuring that the cement base 9 can be used for electrical isolation purposes to prevent the electrical signal of the test box from being affected by the external electrical environment, ensure the accuracy and reliability of the test system, and improve the reliability and stability of the entire cathodic protection unit. The cement base 9 is corrosion-resistant and weather-resistant, and can maintain the integrity of the structure for a long time in an outdoor environment, thereby protecting the service life of the test box.

[0034] like Figure 1 As shown, in a specific example provided by the present application, one end of the test pipe 21 passes through the cement base 9 and is covered by the nylon mesh 18, and the other end is closed by the test end cover 23, and the test cover 23 is pressed against the top of the test pipe 21 through the cover plate 1. It should be noted that in this embodiment, bentonite is installed in the test pipe 21, and the moisture retention of bentonite ensures the stability of the humidity of the environment in the test hole, preventing inaccurate measurements caused by drying.

[0035] During actual use, the test line 21 provides a convenient port, and the operator can insert a portable reference electrode into the test hole to perform potential measurement. Through the test line 21 and the bentonite inside it, a stable test environment can be guaranteed during potential measurement. During potential measurement, the reference electrode is inserted into the test hole to form a closed loop with the pipeline 15, thereby reading the actual protection potential of the pipeline 15. Through the sealing of the cement base 9 and the nylon mesh 18, the test line 21 can be electrically isolated, reducing the influence of stray current and ensuring the accuracy of the test results. When the test results need to be manually reviewed, the operator opens the test end cover 23, inserts the reference electrode and connects it to the test cable 17, and directly reads the actual cathodic protection value from the pipeline 15.

[0036] like Figure 1 As shown, in a specific example provided in the present application, a rubber gasket is provided between the top of the body 6 and the cover plate 1 to increase the sealing between the body 6 and the cover plate 1 .

[0037] like Figure 1As shown, in a specific example provided by the present application, the cathodic protection unit includes a magnesium alloy anode 14 electrically connected to the anode cable 11, a copper rod 12 electrically connected to the reference cable 10, and a filler bag 13 wrapped around the periphery of the magnesium alloy anode plate 14. In this embodiment, the filler bag 13 is used to wrap the magnesium alloy anode plate 14 to ensure good electrochemical contact and potential stability of the magnesium alloy anode plate 14 in the soil.

[0038] It can be understood that the electrical corrosion of the magnesium alloy anode 14 (low potential) releases electrons to protect the pipeline (high potential), ensuring that the pipeline surface is at a relatively negative potential, thereby preventing the occurrence of corrosion reactions. The copper rod 12 and the soil form a stable and reliable reference potential point for measuring the protective potential near the pipeline.

[0039] like Figure 1 As shown, in a specific example provided by the present application, the connecting member includes a cover plate bolt 4; an upper connecting hole for installing the cover plate bolt 4 is provided on the cover plate 1; a lower connecting hole corresponding to the upper connecting hole is provided on the top of the body 6; the cover plate bolt 4 passes through the upper connecting hole to connect the lower connecting hole to press the cover plate 1 to the body 6. Specifically, a recessed groove is provided on the cover plate 1 where the upper connecting hole is located to hide the cover plate bolt 4, The specific working principle of the concealed self-detection test box of this application: Potential feedback: When the cathodic protection unit of the pipeline 15 is in operation, the potential of the pipeline 15 will change according to the actual situation. The pipeline potential information is fed back to the self-detection module 7 through the reference cable 10 and the anode cable 11 of the copper rod 12 and the magnesium alloy anode 14.

[0040] Saturation voltage setting: The specification of the transistor 29 is adjusted according to specific needs so that its saturation voltage is maintained at 0.8V (vsCu / CuSO4 reference electrode) to adapt to different cathodic protection conditions.

[0041] Potential monitoring: When the cathodic protection potential of the pipeline 15 is higher than the set threshold value (such as -0.80v) for some reason, it indicates that the protection effect is not ideal.

[0042] Transistor conduction: When the pipeline protection potential is higher than the set threshold, the potential difference between the magnesium alloy anode 14 (≤-1.6V) and the copper rod 12 is large enough that the voltage between the two N poles (C and E) of the transistor 29 is greater than its turn-on voltage, thereby turning on the transistor.

[0043] Formation of a galvanic cell: When the transistor 29 is turned on, a loop is formed between the copper rod 12 and the magnesium alloy anode 14, producing a galvanic cell effect.

[0044] Alarm signal: powered by the primary battery effect, the alarm 32 (such as an indicator bead / buzzer) is activated to emit an audible and visual signal to notify maintenance personnel to pay attention to the operating status of the cathodic protection unit.

[0045] This application concealed self-test test box operation mode: Daily monitoring: Through the transparent acrylic plate 2, the operator can observe the indicator light status from the outside without opening the cover 1. If the indicator light is off, it means that the system is operating normally.

[0046] Manual review: If the indicator light is always on, it indicates that there may be a problem with the system. The maintenance personnel need to open cover 1 and measure the actual protection potential by inserting a portable reference electrode to manually review and evaluate the cathodic protection unit.

[0047] At the same time, when in use, the concealed protection potential self-detection test box can also be used for pipeline continuity detection and pipeline direction detection. The specific method is that after the concealed protection potential self-detection test box is laid out, the power supply of the pipeline cathodic protection equipment can be stopped (using the impressed current cathodic protection method) or reverse power can be applied at one point of the pipeline to manually make the protection potential higher than -0.80v. At this time, the concealed protection potential self-detection test boxes along the pipeline will all issue sound / light alarms, that is, pipeline continuity / direction detection is achieved.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A concealed self-detection test box for cathodic protection, characterized in that: include: A body (6), the body (6) having a receiving chamber (61) with a top opening, a test terminal (22) being provided on an inner wall of the receiving chamber (61), the test terminal (22) being connected to a pipe (15) via a test cable (17), and a test pipeline (21) extending out of the body (6) being provided in the receiving chamber (61); A cover plate (1), the cover plate (1) being covered on the top of the body (6) via a connecting piece, and the upper surface of the cover plate (1) being flush with the road surface; A self-detection module (7), the self-detection module (7) located in the receiving chamber (8) is installed at the bottom of the receiving chamber (61), the self-detection module (7) is electrically connected to the cathode protection unit via a cable, and the self-detection module (7) is electrically connected to the test terminal (22).

2. The concealed self-detection test box for cathodic protection as claimed in claim 1, characterized in that: The self-test module (7) comprises a self-test housing (28) and a detection mainboard (27) disposed in the self-test housing (28); The outer periphery of the self-test housing (28) is provided with a connecting ear (281) and three wiring terminals (25), the connecting ear (281) is installed on the bottom of the containing chamber (61) by means of fixing bolts, the three wiring terminals are respectively connected to the anode cable (11), the reference cable (10) and the test cable (17), and the anode cable (11) and the reference cable (10) are electrically connected to the cathodic protection unit; The detection mainboard (27) and each of the connection terminals (25) are electrically connected via a wire.

3. The concealed self-detection test box for cathodic protection as claimed in claim 2, characterized in that: The detection main board (27) is provided with an alarm (32) passing through the top of the self-test housing (28); A transparent plate (2) for observing the alarm (32) is provided on the cover plate (1).

4. The concealed self-detection test box for cathodic protection as claimed in claim 3, characterized in that: A buffer gasket (3) is provided between the self-test housing (28) and the cover plate (1).

5. The concealed self-detection test box for cathodic protection according to any one of claims 1 to 4, characterized in that: A cement base (9) is installed at the bottom of the body (6) to isolate external electrical signals.

6. The concealed self-detection test box for cathodic protection as claimed in claim 5, characterized in that: The cement base (9) is provided with a first inlet gland (191) and a second outlet gland (192) which are connected to the accommodating chamber (61); The test cable (17) enters the containing chamber (61) through the first inlet gland (191); The anode cable (11) and the reference cable (10) enter the containing chamber (61) through the second conducting gland (192).

7. The concealed self-detection test box for cathodic protection as claimed in claim 5, characterized in that: One end of the test pipeline (21) passes through the cement base (9) and is sealed by a nylon mesh (18), and the other end is closed by a test end cover (23). The test cover (23) is pressed against the top of the test pipeline (21) by the cover plate (1).

8. The concealed self-detection test box for cathodic protection as claimed in claim 1, characterized in that: A rubber gasket is provided between the top of the body (6) and the cover plate (1) to increase the sealing performance between the body (6) and the cover plate (1).

9. The concealed self-detection test box for cathodic protection as claimed in claim 1, characterized in that: The cathode protection unit comprises a magnesium alloy anode (14) electrically connected to the anode cable (11), and a copper rod (12) electrically connected to the reference cable (10); the outer periphery of the magnesium alloy anode plate (14) is wrapped with a filler bag (13).

10. The concealed self-detection test box for cathodic protection according to claim 1, characterized in that: The connecting member comprises a cover bolt (4); The cover plate (1) is provided with an upper connection hole for installing the cover plate bolt (4); The top of the body (6) is provided with a lower connection hole corresponding to the upper connection hole; The cover plate bolts (4) pass through the upper connection holes to connect the lower connection holes and press the cover plate (1) onto the body (6).

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