A cathodic protection polarization probe for preventing test piece contamination
By setting the appropriate position of the polarized test piece in the polarization probe and using the matching structure of the fixed tube and the shielding ring, the problem of the polarized test piece being contaminated is solved, and accurate potential detection and measurement without IR drop are achieved.
Patent Information
- Application Number
- CN202421513329.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the existing polarization probe structure, the polarized test piece is close to the end of the bottom permeable membrane. After use for a period of time, the copper sulfate solution that penetrates through the permeable membrane will contaminate the polarized test piece, resulting in large errors in the test data.
A cathode-protected polarization probe is designed to prevent contamination of test pieces. By setting the polarized test piece one-quarter from the top of the plastic sleeve, and using the cooperation of the fixing tube, shielding ring and fastening bolts, a surrounding covering structure is formed to avoid contamination of the polarized test piece by copper sulfate solution.
It effectively avoids contamination of polarized test pieces, reduces errors in test data, can accurately detect the protection potential value on the protected structure, and obtains a potential without interruption of the protection power supply.
Smart Images
Figure CN222700416U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cathode protection systems for metal corrosion prevention, in particular to a cathode protection polarization probe for preventing test piece pollution. Background Art
[0002] Cathodic protection is a widely used technology to prevent corrosion of structures such as steel pipelines. The measurement of polarization potential is the most important control parameter for the implementation of this technology. However, the traditional method of measuring the polarization potential of buried structures will cause errors due to the inevitable IR drop. Since the IR drop in pipeline potential measurement is affected by many factors, including soil resistivity, reference electrode position, cathodic protection current, coating defect resistance, coating capacitive reactance, inductive reactance, etc., and the geographical environment of domestic buried steel pipelines is complex and changeable, and the quality of pipeline anti-corrosion layers varies, the IR drop of different pipelines, different sections of the same pipeline, and the same section at different times is also different. For this reason, the power-off measurement method is required to eliminate the IR drop.
[0003] At present, power-off measurement in engineering is often difficult to implement due to many inconveniences. For example, in impressed current cathodic protection, it is not possible to frequently "power off" for pile-by-pile measurement, and the sacrificial anode method cannot be used for power-off measurement 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 stray current interference. When there is stray current interference or local macro cells are generated due to differences in anti-corrosion layer defects, it is difficult to measure the true pipeline polarization potential even if the power-off method is used.
[0004] For the above reasons, polarization probes have gradually been accepted by people 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 implement power-off measurements. However, since the polarization test piece in the previous polarization probe structure is close to the bottom permeable membrane end, the copper sulfate solution that seeps through the permeable membrane will contaminate the polarization test piece after a period of use, resulting in large errors in the test data and inconvenience in use.
[0005] Therefore, the present application provides a cathodic protection polarization probe that prevents test piece contamination to solve the above technical solution. Utility Model Content
[0006] The technical problem to be solved by the utility model is to provide a cathodic protection polarization probe that can prevent test piece contamination, so as to solve the problem that in the existing polarization probe structure, the polarization test piece is close to the bottom permeable membrane end, and the copper sulfate solution that seeps through the permeable membrane after being used for a period of time will contaminate the polarization test piece, resulting in large errors in test data.
[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0008] A cathodic protection polarization probe for preventing test piece contamination, comprising 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, fixing tubes are symmetrically fixed on both sides of the top outer edge of the plastic sleeve, the fixing tubes are connected to the inside of the plastic sleeve, the two polarization test pieces are respectively fixed in the two fixing tubes, and a shielding ring is threadedly sleeved on one end of the fixing tube away from the plastic sleeve, and the shielding ring surrounds and covers the four sides of the polarization test piece;
[0009] The ceramic pot has a high-purity copper electrode and saturated copper sulfate built in. The bottom of the ceramic pot 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.
[0010] Optionally, the plastic sleeve and the ceramic pot are concentric cylinders.
[0011] Optionally, a packing medium is filled between the plastic sleeve and the ceramic pot.
[0012] Optionally, the polarization test piece and the fixing tube are located at a quarter of the distance from the top of the plastic sleeve.
[0013] Optionally, the polarization test piece extends one centimeter beyond the outer edge of the plastic sleeve.
[0014] Optionally, the cross-section of the polarization test piece is a circle of one square centimeter.
[0015] Optionally, the outer edge surface of the fixing tube is configured with an external thread, the inner side of the shielding ring is configured with an internal thread, and the shielding ring is threadedly mounted on the fixing tube.
[0016] Optionally, a fastening bolt is provided on the surface of the shielding ring, and the fastening bolt passes through the shielding ring and abuts against the outer edge surface of the fixing tube.
[0017] Optionally, a three-core cable is connected to the top of the plastic sleeve, and three cable wires in the three-core cable are respectively connected to the two polarization test pieces and one high-purity copper electrode.
[0018] Optionally, the small holes opened on the surface of the plastic sleeve are paved with non-woven fabric.
[0019] Compared with the prior art, the utility model has at least the following beneficial effects:
[0020] 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.
[0021] At the same time, by arranging the polarization test piece at a distance of one quarter from the top of the plastic sleeve, the problem that the polarization test piece in the previous polarization probe structure is easily contaminated can be effectively solved.
[0022] Moreover, thanks to the cooperation of the fixing tube, shielding ring and fastening bolts, the exposed area of the polarization test piece can be easily adjusted, so that in actual use, it can flexibly simulate the size of the damaged point of the pipeline anti-corrosion layer, so as to measure the potential change at that location and thus evaluate the effect of cathodic protection.
[0023] In summary, the device has a novel structure and reasonable design, and has the advantages of good stability, firmness and reliability, long service life, ease of application on engineering sites, and flexible use. It can effectively solve the problem that the polarization test piece in the previous polarization probe structure is easily contaminated. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] 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.
[0025] Figure 1 Schematic diagram of the three-dimensional structure of the cathodic protection polarization probe to prevent contamination of the test piece;
[0026] Figure 2 Schematic diagram of the internal three-dimensional structure of the cathodic protection polarization probe to prevent contamination of the test piece;
[0027] Figure 3 Schematic diagram of the partial structure of the cathodic protection polarization probe to prevent contamination of the test piece;
[0028] Figure 4 Schematic diagram of the use of cathodic protection polarization probe to prevent test piece contamination.
[0029] [Reference Signs]
[0030] 1. Plastic sleeve; 2. Polarization test piece; 3. Ceramic jar; 4. High-purity copper electrode; 5. Three-core cable; 6. Saturated copper sulfate; 7. Packing medium; 8. Fixing tube; 9. Shielding ring; 10. Fastening bolt; 11. Lap piece; 12. Test pile; 13. Pipeline to be tested; 14. Reference tube; 15. Polarization probe body.
[0031] 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
[0032] The following is a detailed description of a cathodic protection polarization probe for preventing test piece contamination 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.
[0033] 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).
[0034] 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.
[0035] 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.
[0036] 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.
[0037] like Figure 1 and Figure 2As shown, the embodiment of the utility model provides a cathodic protection polarization probe for preventing test piece contamination, including a plastic sleeve 1, a ceramic pot 3 and two polarization test pieces 2, wherein the plastic sleeve 1 and the ceramic pot 3 are concentric cylinders, the plastic sleeve 1 is located outside the probe, the ceramic pot 3 is located inside the probe, the plastic sleeve 1 and the ceramic pot 3 are filled with a packing medium 7, and the top of the plastic sleeve 1 and the top of the ceramic pot 3 are filled with a curing agent. The ceramic pot 3 has a high-purity copper electrode 4 and a saturated copper sulfate 6 built in, the bottom of the ceramic pot 3 is connected to the outside through microporous ceramics, the surface of the plastic sleeve 1 is provided with a plurality of small holes connected to the outside, and the small holes opened on the surface of the plastic sleeve 1 are paved with non-woven fabrics.
[0038] At the same time, fixed tubes 8 are symmetrically fixed on both sides of the top outer edge of the plastic sleeve 1, and the fixed tubes 8 are connected to the inside of the plastic sleeve 1. Two polarization test pieces 2 are fixed in the two fixed tubes 8 respectively. The polarization test pieces 2 and the fixed tubes 8 are located at a quarter of the distance from the top of the plastic sleeve 1, so that the two polarization test pieces 2 are far away from the copper sulfate seepage point, avoiding the problem of easy contamination of the test pieces caused by placing the test pieces at the bottom of the old polarization probe. In specific implementation, the polarization test piece 2 extends one centimeter from the outer edge of the plastic sleeve 1, and the design of protruding one centimeter outside the plastic sleeve 1 can ensure that the polarization test piece 2 is in full contact with the soil, and can avoid the problem of the side of the plastic sleeve 1 being damaged by external force due to excessive protrusion, and the cross-section of the polarization test piece 2 is a circle of one square centimeter, which can meet the requirements of simulating common anti-corrosion layer defects of pipelines and is convenient for measuring AC current density.
[0039] In addition, a three-core cable 5 is connected to the top of the plastic sleeve 1. The three cables in the three-core cable 5 are respectively connected to two polarization test pieces 2 and a high-purity copper electrode 4. The connection method can be but is not limited to screw fastening.
[0040] Cooperate Figure 3 As shown, a shielding ring 9 is threadedly sleeved on one end of the fixing tube 8 away from the plastic sleeve 1, and the shielding ring 9 surrounds and covers the polarization test piece 2. In specific implementation, in this embodiment, the outer edge surface of the fixing tube 8 is constructed with an external thread, and the inner side of the shielding ring 9 is constructed with an internal thread, so that the shielding ring 9 is threadedly installed on the fixing tube 8, which is convenient for telescopic adjustment, and a fastening bolt 10 is provided on the surface of the shielding ring 9, which passes through the shielding ring 9 and abuts against the outer edge surface of the fixing tube 8, so as to fix the shielding ring 9 after the telescopic adjustment.
[0041] At the same time, in the present embodiment, a scale is further provided on the surface of the polarization test piece 2 along the moving direction of the shielding ring 9 on the fixed tube 8, and the scale indication specifically indicates the surface area of the polarization test piece 2 outside the exposed shielding ring 9. Therefore, the exposed area of the polarization test piece 2 can be conveniently adjusted, so that in actual use, it can flexibly simulate the size of the damaged point of the pipeline anti-corrosion layer, so as to measure the potential change there, thereby evaluating the effect of cathodic protection.
[0042] 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 15 in the embodiment.
[0043] like Figure 1-Figure 4 As shown, the polarization probe body 15 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;
[0044] The three-core cable 5 of the polarization probe body 15 is connected in the test pile 12 in such a way that the blue wire is connected to the natural test piece end, the red wire is connected to the cathode protection pipeline end, and the black wire is connected to the reference end. The red wire is connected to the pipeline 13 to be tested through the jumper 11. The potential of the pipeline 13 to be tested is generally between -0.85V and -1.2V.
[0045] The polarization probe body 15 is buried within 0.5 meters around the pipeline 13 to be tested, and is placed obliquely and covered with fine soil. At the same time, a reference tube 14 with a length of about 1.5 meters is buried above the polarization probe body 15. The reference tube 14 and the pipeline 13 to be tested are filled tightly with soil. After filling, water is poured through the reference tube 14 to keep the soil around the polarization probe body 15 moist.
[0046] After the polarization probe body 15 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.
[0047] 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.
[0048] 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 for preventing test piece contamination, comprising a plastic sleeve, a ceramic pot and two polarization test pieces, characterized in that: The plastic sleeve is located outside the probe, and the ceramic jar is located inside the probe. Fixed tubes are symmetrically fixed on both sides of the top outer edge of the plastic sleeve, and the fixed tubes are connected to the inside of the plastic sleeve. The two polarization test pieces are respectively fixed in the two fixed tubes, and a shielding ring is threadedly sleeved on one end of the fixed tube away from the plastic sleeve, and the shielding ring surrounds and covers the four sides of the polarization test piece. The ceramic pot has a high-purity copper electrode and saturated copper sulfate built in. The bottom of the ceramic pot 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.
2. The cathodic protection polarization probe for preventing test piece contamination according to claim 1, characterized in that: The plastic sleeve and the ceramic pot are concentric cylinders.
3. The cathodic protection polarization probe for preventing test piece contamination according to claim 1, characterized in that: A packing medium is filled between the plastic sleeve and the ceramic pot.
4. The cathodic protection polarization probe for preventing test piece contamination according to claim 1, characterized in that: The polarization test piece and the fixing tube are located at a quarter of the distance from the top of the plastic sleeve.
5. The cathodic protection polarization probe for preventing test piece contamination according to claim 1, characterized in that: The polarization test piece extends out of the outer edge of the plastic sleeve by one centimeter.
6. The cathodic protection polarization probe for preventing test piece contamination according to claim 1, characterized in that: The cross section of the polarization test piece is a circle with an area of one square centimeter.
7. The cathodic protection polarization probe for preventing test piece contamination according to claim 1, characterized in that: The outer edge surface of the fixing pipe is configured with an external thread, and the inner side of the shielding ring is configured with an internal thread, and the shielding ring is threadedly mounted on the fixing pipe.
8. The cathodic protection polarization probe for preventing test piece contamination according to claim 7, characterized in that: A fastening bolt is arranged on the surface of the shielding ring. The fastening bolt passes through the shielding ring and abuts against the outer edge surface of the fixing pipe.
9. The cathodic protection polarization probe for preventing test piece contamination according to claim 1, characterized in that: A three-core cable is connected to the top of the plastic sleeve, and three cable wires in the three-core cable are respectively connected to the two polarization test pieces and one high-purity copper electrode.
10. The cathodic protection polarization probe for preventing test piece contamination according to claim 1, characterized in that: The small holes on the surface of the plastic sleeve are paved with non-woven fabric.