A cathodic protection polarization probe with a long life structure

Abstract

The utility model provides a cathodic protection polarization probe with a long-life structure, which belongs to the technical field of cathodic protection systems for metal corrosion protection. It includes a plastic sleeve, a ceramic tank and two polarization test pieces, wherein the plastic sleeve is located outside the probe, the ceramic tank is located inside the probe, and the two polarization test pieces are respectively fixed on both sides of the top outer edge surface of the plastic sleeve, the ceramic tank is built with a high-purity copper electrode and saturated copper sulfate, the bottom of the ceramic tank is connected to the outside world through microporous ceramics, the surface of the plastic sleeve is provided with a plurality of small holes connected to the outside world, and the outer edge surface of the upper half of the ceramic tank is coated with an anti-penetration coating. The utility model has the advantages of good stability, firmness and reliability, long service life, easy application on engineering sites, stable product wiring and not easy to loosen, etc., and can effectively solve the problem of excessive consumption of copper sulfate in the polarization probe structure of the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of cathode protection systems for metal corrosion protection, in particular to a cathode protection polarization probe with a long-life structure. Background Art

[0002] Cathodic protection is a widely used technology to prevent corrosion of structures such as steel pipelines, and the measurement of polarization potential is the most important control parameter for implementing this technology. However, when measuring the polarization potential of buried structures by traditional methods, errors will be caused by the inevitable IR drop. For this reason, in the prior art, the IR drop is eliminated by adopting the power-off measurement method, but in engineering, power-off measurement is often difficult to implement due to many inconveniences. For example, during impressed current cathodic protection, the power cannot be frequently "cut off" for pile-by-pile measurement, and the sacrificial anode method cannot be powered off for measurement at all because it is impossible to completely disconnect the connection between the anode and the pipeline. In addition, an important prerequisite for power-off measurement is that there is no interference from stray currents. When there is interference from stray currents or local macro cells are generated due to differences in defects in the anti-corrosion layer, it is difficult to measure the true polarization potential of the pipeline even if the power-off method is used.

[0003] Polarization probes are widely used because they can reduce the IR drop on the measurement channel to a minimum (negligible in engineering), are completely unaffected by stray interference currents, and can easily perform power-off measurements. However, due to the large penetration area of ​​the microporous ceramic tank in the inner layer of the existing polarization probe structure, copper sulfate is consumed too quickly, making it difficult to guarantee its service life, which makes it inconvenient to use in the process of buried pipeline corrosion testing.

[0004] Therefore, the present application provides a cathodic protection polarization probe with a long life structure to solve the above technical problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a cathodic protection polarization probe with a long life structure, so as to solve the problem that the microporous ceramic tank of the inner layer in the existing polarization probe structure has an excessively large penetration area, which causes the copper sulfate to be consumed too quickly, resulting in its service life failing to meet the requirements of buried pipeline corrosion testing.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A cathodic protection polarization probe with a long-life structure comprises a plastic sleeve, a ceramic pot and two polarization test pieces, wherein the plastic sleeve is located outside the probe, the ceramic pot is located inside the probe, the two polarization test pieces are respectively fixed on both sides of the top outer edge surface of the plastic sleeve, the ceramic pot is equipped with a high-purity copper electrode and saturated copper sulfate, the bottom of the ceramic pot is connected to the outside world through microporous ceramics, a plurality of small holes connected to the outside world are opened on the surface of the plastic sleeve, and the outer edge surface of the upper half of the ceramic pot is coated with an anti-permeation coating.

[0008] Optionally, the coating range of the anti-permeability coating is from the top of the outer edge of the ceramic jar to one third of the distance from the bottom.

[0009] Optionally, the plastic sleeve and the ceramic jar are concentric cylinders.

[0010] Optionally, a packing medium is filled between the plastic sleeve and the ceramic pot.

[0011] Optionally, the top of the plastic sleeve and the top of the ceramic pot are filled with a curing agent.

[0012] Optionally, a three-core cable is connected to the top of the plastic sleeve, and three cable wires of the three-core cable are respectively connected to the two polarization test pieces and one high-purity copper electrode.

[0013] Optionally, the top of the plastic sleeve is provided with an opening, and a top seat is detachably mounted thereon, wherein a U-shaped channel is provided in the top seat for the three-core cable to pass through.

[0014] Optionally, two movable cavities are symmetrically opened in the top seat, and a convex column is fixed in each of the two movable cavities, and a spring is fixed on the convex column. The spring is connected to a clamping block, and the clamping block horizontally extends out of the side surface of the top seat, and is clamped with a corresponding clamping groove on the inner wall of the top opening of the plastic sleeve, and one end of the clamping block located in the movable cavity is constructed with an upward inclined surface, and a pressing column is provided on the upper end surface of the top seat, and the lower end of the pressing column abuts against the end inclined surface of the clamping block.

[0015] Optionally, the top seat is a structure of two symmetrically matched semi-cylindrical bodies, and U-shaped grooves are symmetrically provided on one side of the two semi-cylinders facing each other, and the two U-shaped grooves are butt-jointed to form the U-shaped channel.

[0016] Optionally, fixing holes are correspondingly opened on the two semi-cylindrical structures of the top seat, and the fixing holes are used for fastening bolts to pass through and fix.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] In the above scheme, the potential without IR drop can be obtained without interrupting the protection power supply, which can effectively eliminate the potential error caused by factors such as soil IR drop and stray current, and can accurately detect the protection potential value on the protected structure in the stray current interference area.

[0019] At the same time, by applying an anti-permeation coating on the upper half of the ceramic tank, the penetration area of ​​the ceramic tank can be reduced, solving the problem that the penetration area of ​​the inner layer of the microporous ceramic tank in the previous polarization probe structure is too large, resulting in excessive consumption of copper sulfate and difficulty in ensuring the life span.

[0020] Moreover, thanks to the setting of the top seat, a U-shaped channel for the three-core cable to pass through can be formed on the top of the plastic sleeve. The three-core cable can be limited by the U-shaped channel, so that the three-core cable is not easily pulled and moved during the pre-buried installation, which may cause the connection between the cable wire and the polarization test piece and the high-purity copper electrode to fall off, thereby ensuring the normal use of the polarization probe.

[0021] In addition, thanks to the cooperation of the spring, the clamping block and the pressing column on the top seat, the horizontal extension and retraction of the clamping block on the side of the top seat can be conveniently controlled by pressing down the pressing column, thereby facilitating the detachable installation of the top seat at the top of the plastic sleeve, which is easy to use.

[0022] In summary, the device has a novel structure and a reasonable design, and has the advantages of good stability, firmness, reliability, long service life, ease of application on engineering sites, stable product wiring and not easy to loosen, etc. It can effectively solve the problem of excessive consumption of copper sulfate in the polarization probe structure of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the present invention and enable those skilled in the relevant art to make and use the present invention.

[0024] Figure 1 Schematic diagram of the three-dimensional structure of the cathodic protection polarization probe to prevent contamination of the test piece;

[0025] Figure 2 Schematic diagram of the internal three-dimensional structure of the cathodic protection polarization probe to prevent contamination of the test piece;

[0026] Figure 3 It is a structural schematic diagram of the top seat;

[0027] Figure 4 Schematic diagram of the use of cathodic protection polarization probe to prevent test piece contamination.

[0028] [Reference Signs]

[0029] 1. Plastic sleeve; 2. Polarization test piece; 3. Ceramic jar; 4. Anti-penetration coating; 5. High-purity copper electrode; 6. Saturated copper sulfate; 7. Packing medium; 8. Three-core cable; 9. Top seat; 10. U-shaped channel; 11. Fixing hole; 12. Movable cavity; 1201. Boss; 1202. Spring; 1203. Clamping block; 1204. Pressing column; 13. Lap piece; 14. Test pile; 15. Pipeline to be tested; 16. Reference tube; 17. Polarization probe body.

[0030] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0031] The following is a detailed description of a cathodic protection polarization probe with a long life structure provided by the utility model in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the utility model.

[0032] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0033] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0034] It is to be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0035] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0036] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a cathodic protection polarization probe with a long-life structure, including a plastic sleeve 1, a ceramic pot 3 and two polarization test pieces 2, wherein the plastic sleeve 1 is located on the outside of the probe, and the ceramic pot 3 is located on the inside of the probe, the plastic sleeve 1 and the ceramic pot 3 are concentric cylinders, and a packaging medium 7 is filled between the plastic sleeve 1 and the ceramic pot 3, wherein the packaging medium 7 is composed of gypsum powder, bentonite and industrial sodium sulfate, and the top of the plastic sleeve 1 and the top of the ceramic pot 3 are filled with a curing agent.

[0037] The two polarization test pieces 2 are respectively fixed on both sides of the top outer edge surface of the plastic sleeve 1. The ceramic tank 3 has a high-purity copper electrode 5 and a saturated copper sulfate 6 built in. The bottom of the ceramic tank 3 is connected to the outside world through microporous ceramics. The surface of the plastic sleeve 1 is provided with a plurality of small holes connected to the outside world. Non-woven fabric is laid at the small holes, and the outer edge surface of the upper half of the ceramic tank 3 is coated with an anti-penetration coating 4. The coating range of the anti-penetration coating 4 is from the top of the outer edge surface of the ceramic tank 3 to one-third of the distance from the bottom. By applying the anti-penetration coating 4 on the upper half of the ceramic tank 3, the penetration area of ​​the ceramic tank 3 can be reduced, which solves the problem that the penetration area of ​​the inner microporous ceramic tank 3 in the previous polarization probe structure is too large, resulting in too fast consumption of saturated copper sulfate 6 and difficulty in ensuring the service life.

[0038] At the same time, the height of the anti-permeability coating 4 is from the top of the side to one-third of the bottom, so that the inside and outside of the bottom one-third part can penetrate each other, thereby providing a stable working environment for the internal copper sulfate electrode and ensuring the accuracy of the copper sulfate electrode.

[0039] Cooperate Figure 3As shown, a three-core cable 8 is connected to the top of the plastic sleeve 1, and three cables of the three-core cable 8 are respectively connected to two polarization test pieces 2 and a high-purity copper electrode 5. Specifically, an opening is provided at the top of the plastic sleeve 1, and a top seat 9 is detachably installed, and a U-shaped channel 10 is provided in the top seat 9 for the three-core cable 8 to pass through.

[0040] Specifically, two movable cavities 12 are symmetrically provided in the top seat 9, and a convex column 1201 is fixed in each of the two movable cavities 12, and a spring 1202 is fixed on the convex column 1201. The spring 1202 is connected to a clamping block 1203, and the clamping block 1203 extends horizontally out of the side of the top seat 9, and is clamped with a corresponding clamping groove on the inner wall of the top opening of the plastic sleeve 1, and one end of the clamping block 1203 located in the movable cavity 12 is constructed with an upward inclined surface, and a pressing column 1204 is provided on the upper end surface of the top seat 9, and the lower end of the pressing column 1204 abuts against the end inclined surface of the clamping block 1203, so that when 1204 is pressed down, the clamping block 1203 can be retracted into the inside of the movable cavity 12 by abutting against the inclined surface, so as to control the disassembly and assembly of the top seat 9 at the top opening of the plastic sleeve 1.

[0041] In addition, compared with the threaded screwing method in the prior art, the installation structure of the top seat 9 is not only simpler and more convenient to operate, but also will not cause the three-core cable 8 to twist and break due to screwing.

[0042] In this embodiment, the top seat 9 is composed of two symmetrically matched semi-cylindrical structures, and U-shaped grooves are symmetrically provided on the opposite sides of the two semi-cylinders. The two U-shaped grooves are butt-jointed to form a U-shaped channel 10, and fixing holes 11 are correspondingly provided on the two semi-cylindrical structures of the top seat 9. The fixing holes 11 are for fastening bolts to pass through and fix, so that the top seat 9 can be spliced ​​and fixed, which makes it convenient to place the three-core cable 8 in the U-shaped channel 10.

[0043] The following is a description of the specific embodiments, wherein the cathodic protection polarization probe composed of the above components is Figure 4 The polarization probe body 17 in the embodiment of the present invention.

[0044] like Figure 1-Figure 4 As shown, the polarization probe body 17 must be soaked in water for more than 24 hours before use, and the soaking liquid level should be between the polarization test piece 2 and the uppermost hole to avoid contact between the polarization test piece 2 and water during soaking;

[0045] The three-core cable 8 of the polarization probe body 17 is connected in the test pile 14 in such a way that the blue line is connected to the natural test piece end, the red line is connected to the cathode protection pipeline end, and the black line is connected to the reference end. The red line is connected to the pipeline 15 to be tested through the bonding piece 13, and the potential of the pipeline 15 to be tested to the ground is generally between -0.85V and -1.2V;

[0046] At the same time, the polarization probe body 17 is buried within 0.5 meters around the pipe to be tested 15, placed obliquely, and covered with fine soil. A reference tube 16 about 1.5 meters long is buried above the polarization probe body 17. The reference tube 16 and the test pile 14 are filled tightly with soil. After filling, water is poured through the reference tube 16 to keep the soil around the polarization probe moist.

[0047] After the polarization probe body 17 of the utility model is installed, the polarization potential of the pipeline can be obtained without interrupting the running cathodic protection system. It can effectively eliminate the potential error caused by factors such as soil IR drop and stray current, and can accurately detect the protection potential value on the protected structure.

[0048] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the preferred embodiment of the present invention, and the present invention can be fully understood by those skilled in the art without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A cathodic protection polarization probe with a long life structure, comprising a plastic sleeve, a ceramic tank and two polarization test pieces, characterized in that: The plastic sleeve is located on the outside of the probe, the ceramic jar is located on the inside of the probe, the two polarization test pieces are respectively fixed on both sides of the top outer edge surface of the plastic sleeve, the ceramic jar has high-purity copper electrodes and saturated copper sulfate built in, the bottom of the ceramic jar is connected to the outside world through microporous ceramics, the surface of the plastic sleeve is provided with multiple small holes connected to the outside world, and the outer edge surface of the upper half of the ceramic jar is coated with an anti-permeation coating.

2. The cathodic protection polarization probe with a long life structure according to claim 1, characterized in that: The coating range of the anti-permeability coating is from the top of the outer edge of the ceramic jar to one third of the distance from the bottom.

3. The cathodic protection polarization probe with a long life structure according to claim 1, characterized in that: The plastic sleeve and the ceramic pot are concentric cylinders.

4. The cathodic protection polarization probe with a long life structure according to claim 1, characterized in that: The space between the plastic sleeve and the ceramic pot is filled with a packing medium.

5. The cathodic protection polarization probe with a long life structure according to claim 1, characterized in that: The top of the plastic sleeve and the top of the ceramic pot are filled with curing agent.

6. The cathodic protection polarization probe with a long life structure according to claim 1, characterized in that: A three-core cable is connected to the top of the plastic sleeve, and three cable wires of the three-core cable are respectively connected to the two polarization test pieces and one high-purity copper electrode.

7. The cathodic protection polarization probe with a long life structure according to claim 6, characterized in that: The top of the plastic sleeve is provided with an opening, and a top seat is detachably mounted thereon, wherein a U-shaped channel for the three-core cable to pass through is provided in the top seat.

8. The cathodic protection polarization probe with a long life structure according to claim 7, characterized in that: Two movable cavities are symmetrically provided in the top seat, and convex columns are fixed in the two movable cavities, and a spring is fixed on the convex column. The spring is connected to a clamping block, and the clamping block horizontally extends out of the side surface of the top seat and is clamped with a corresponding clamping groove on the inner wall of the top opening of the plastic sleeve, and one end of the clamping block located in the movable cavity is constructed with an upward inclined surface, and a pressing column is provided on the upper end surface of the top seat, and the lower end of the pressing column abuts against the end inclined surface of the clamping block.

9. The cathodic protection polarization probe with a long life structure according to claim 7, characterized in that: The top seat is a structure of two symmetrically matched semi-cylinders, and U-shaped grooves are symmetrically opened on one side of the two semi-cylinders facing each other, and the two U-shaped grooves are butt-jointed to form the U-shaped channel.

10. The cathodic protection polarization probe with a long life structure according to claim 9, characterized in that: The two semi-cylindrical structures of the top seat are correspondingly provided with fixing holes, and the fixing holes are used for fastening bolts to pass through and fix.

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