Reference electrode and cathode protection system

Abstract

The invention provides a reference electrode and a cathode protection system. The reference electrode comprises a first electrode, a second electrode, a third electrode, a first insulating tube, a second insulating tube and a third insulating tube, the first insulating tube is provided with a first accommodating cavity, the second insulating tube is provided with a second accommodating cavity, one of the first accommodating cavity and the second accommodating cavity accommodates a first solution, the other accommodates a second solution, and the first accommodating cavity and the second accommodating cavity are separated from each other; under the condition that the temperature is greater than the threshold temperature, the unit temperature solubility variation of the first solution is different from the unit temperature solubility variation of the second solution; or, under the condition that the temperature is higher than the threshold temperature, the solubility of one of the first solution and the second solution is increased along with the temperature rise, and the solubility of the other solution is reduced along with the temperature rise. Through the arrangement, the potential fluctuation of the reference electrode is improved, and the potential stability of the reference electrode is improved.

Description

Technical Field

[0001] The present application relates to the field of electrode technology, and in particular to a reference electrode and a cathode protection system. Background Art

[0002] Cathodic protection technology is generally used to avoid or reduce metal corrosion. Its principle is to apply an external current to the surface of the corroded metal structure (such as a metal pipe buried in the soil), making the corroded metal structure a cathode, thereby inhibiting the electron migration caused by metal corrosion.

[0003] The reference electrode is one of the important components in the cathodic protection system. It can be used to measure the potential of the protected structure and also as a signal source for the automatic control of the constant potential instrument. The potential stability of the reference electrode determines the potential accuracy and stability of the working electrode.

[0004] In actual use, the potential of the reference electrode will drift as the usage time increases. When this potential drift reaches a certain extent, the reference electrode needs to be replaced to ensure accurate control of the potential on the working electrode, which affects the service life of the reference electrode and increases the cost of use.

[0005] Based on the above description, how to stabilize the potential of the reference electrode becomes an urgent problem to be solved. Summary of the invention

[0006] In view of this, the present application provides a reference electrode and a cathode protection system to improve the potential stability of the reference electrode.

[0007] Specifically, the following technical solutions are included:

[0008] In a first aspect, an embodiment of the present application provides a reference electrode, comprising a first electrode, a second electrode, a third electrode, and a first insulating tube, a second insulating tube, and a third insulating tube connected in sequence;

[0009] The first insulating tube is provided with a first accommodating cavity, and the second insulating tube is provided with a second accommodating cavity, one of the first accommodating cavity and the second accommodating cavity contains a first solution, and the other contains a second solution, and the first accommodating cavity and the second accommodating cavity are separated from each other;

[0010] The third insulating tube is provided with a third accommodating cavity, the third electrode comprises a first conductive part and a second conductive part connected to each other, the first conductive part is accommodated in the third accommodating cavity, and the second conductive part extends into the second accommodating cavity;

[0011] One end of the second electrode is inserted into the second accommodating cavity and spaced apart from the second conductive portion, and the other end is inserted into the first accommodating cavity;

[0012] One end of the first electrode is inserted into the first accommodating cavity and is spaced apart from the second electrode;

[0013] Among them, when the temperature is greater than the threshold temperature, the change in solubility per unit temperature of the first solution is different from the change in solubility per unit temperature of the second solution; or, when the temperature is greater than the threshold temperature, the solubility of one of the first solution and the second solution increases with increasing temperature, and the solubility of the other decreases with increasing temperature.

[0014] In an optional embodiment, the first solution is a saturated copper sulfate solution, and the second solution is one or more of a saturated ferrous sulfate solution, a saturated potassium sulfate solution, a saturated calcium sulfate solution and a saturated sodium sulfate solution.

[0015] In an optional embodiment, the reference electrode further comprises a first seal, a second seal and a third seal, wherein the first seal is arranged at an end of the first insulating tube away from the second insulating tube, the second seal is arranged between the first insulating tube and the second insulating tube, and the third seal is arranged between the second insulating tube and the third insulating tube;

[0016] The first electrode is disposed through the first sealing member, the second electrode is disposed through the second sealing member, and the second conductive portion is disposed through the third sealing member.

[0017] In an optional embodiment, the reference electrode further includes a blocking member, which is mounted on an end of the first sealing member away from the second insulating tube and abuts against the first sealing member;

[0018] The first electrode includes a third conductive part and a wire part which are connected to each other. The third conductive part is partially inserted into the first accommodating cavity. The wire part passes through the blocking member. The wire part is used to be electrically connected to the potential testing device.

[0019] In an optional embodiment, the blocking piece and the first insulating tube, the first insulating tube and the second insulating tube, and the second insulating tube and the third insulating tube are all threadedly connected.

[0020] In an optional embodiment, an insulating outer layer is provided on the periphery of the wire portion.

[0021] In an optional embodiment, the transparency of the first insulating tube, the second insulating tube, the third insulating tube and the blocking member is less than 30%.

[0022] In an optional embodiment, cinnabar powder is added to the first solution and the second solution.

[0023] In an optional embodiment, when the second solution includes a saturated ferrous sulfate solution, vitamin C powder is also added to the second solution.

[0024] In a second aspect, an embodiment of the present application provides a cathodic protection system, comprising a reference electrode provided in any embodiment of the first aspect.

[0025] The beneficial effects of the technical solution provided by the embodiments of the present application include at least: when the temperature is greater than the threshold temperature, if the solubility change per unit temperature of the first solution is different from the solubility change per unit temperature of the second solution, the concentration change per unit temperature of one of the first solution and the second solution is smaller than the concentration change per unit temperature of the other solution, and the overall potential drift of the reference electrode is suppressed, which is beneficial to improving the potential fluctuation of the reference electrode and improving the potential stability of the reference electrode; when the temperature is greater than the threshold temperature, if the first solution and the second solution have different change trends with the temperature change, the concentration of one of the first solution and the second solution increases and the potential is negatively biased, while the concentration of the other decreases and the potential is positively biased, and the overall potential of the reference electrode is balanced, thereby realizing self-correction of the potential of the reference electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of the structure of a reference electrode provided in an embodiment of the present application;

[0028] Figure 2 It is a partial exploded view of the reference electrode provided in the embodiment of the present application.

[0029] The reference numerals in the figures represent respectively:

[0030] 11-first electrode; 111-third conductive portion; 112-conductive wire portion; 12-second electrode; 13-third electrode; 131-first conductive portion; 132-second conductive portion;

[0031] 21-first insulating tube; 211-first accommodating cavity; 212-first threaded hole; 22-second insulating tube; 221-second accommodating cavity; 222-protruding portion; 23-third insulating tube; 231-third accommodating cavity; 232-second threaded hole;

[0032] 31-first solution; 32-second solution;

[0033] 41-first sealing member; 42-second sealing member; 43-third sealing member;

[0034] 5-Sealing piece.

[0035] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally represented by Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0038] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as those generally understood by those of ordinary skill in the art. Some technical terms appearing in the embodiments of the present application are explained below.

[0039] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] First, as Figure 1 and Figure 2 As shown, an embodiment of the present application provides a reference electrode for cathodic protection, including a first electrode 11, a second electrode 12, a third electrode 13, and a first insulating tube 21, a second insulating tube 22, and a third insulating tube 23 connected in sequence.

[0041] The first insulating tube 21 is provided with a first accommodating chamber 211, and the second insulating tube 22 is provided with a second accommodating chamber 221. One of the first accommodating chamber 211 and the second accommodating chamber 221 contains the first solution 31, and the other contains the second solution 32. The first accommodating chamber 211 and the second accommodating chamber 221 are separated from each other.

[0042] The third insulating tube 23 is provided with a third accommodating cavity 231 , and the third electrode 13 includes a first conductive portion 131 and a second conductive portion 132 connected to each other. The first conductive portion 131 is accommodated in the third accommodating cavity 231 and at least partially extends to the outside of the third insulating tube 23 , and the second conductive portion 132 partially extends into the second accommodating cavity 221 .

[0043] One end of the second electrode 12 is inserted into the second accommodating cavity 221 and spaced apart from the second conductive portion 132 , and the other end of the second electrode 12 is inserted into the first accommodating cavity 211 .

[0044] One end of the first electrode 11 is inserted into the first accommodation cavity 211 and is spaced apart from the second electrode 12 .

[0045] Among them, when the temperature is greater than the threshold temperature, the unit temperature solubility change of the first solution 31 is different from the unit temperature solubility change of the second solution 32; or, when the temperature is greater than the threshold temperature, the solubility of one of the first solution 31 and the second solution 32 increases with increasing temperature, and the solubility of the other decreases with increasing temperature.

[0046] For example, Figure 1 As shown, the first insulating tube 21, the second insulating tube 22 and the third insulating tube 23 are connected in sequence from top to bottom, and the two ends of the second insulating tube 22 in the length direction are sealed with the first insulating tube 21 and the third insulating tube 23 respectively, and the first accommodating cavity 211 and the second accommodating cavity 221 are separated from each other and not conductive, so that the first solution 31 and the second solution 32 do not merge.

[0047] Optionally, the first insulating tube 21, the second insulating tube 22 and the third insulating tube 23 are made of insulating materials with a certain hardness, such as alumina ceramics, zirconia ceramics, nylon rods, hard PVC (Polyvinyl chloride), PPR (Polypropylene-Random) and other materials, and have good machining properties.

[0048] The end of the first insulating tube 21 away from the second insulating tube 22 is sealed to ensure the isolation of the interior of the reference electrode from the external environment, avoid oxygen oxidation of the internal electrode, and prevent harmful ion contamination and solution leakage.

[0049] Exemplarily, the cross-sectional outer contours of the first insulating tube 21, the second insulating tube 22 and the third insulating tube 23 are circular. It can be understood that the cross-sectional areas of the first insulating tube 21, the second insulating tube 22 and the third insulating tube 23 are cross-sectional areas formed by planes perpendicular to the length direction of the reference electrode. Figure 1 The vertical direction in .

[0050] The second conductive portion 132 of the first electrode 11 , the second electrode 12 and the third electrode 13 are all made of conductive material, such as metal copper.

[0051] The first conductive portion 131 of the third electrode 13 is disposed in the third accommodating cavity 231, and at least partially extends out of the third insulating tube 23, so as to be exposed at the end of the third insulating tube 23 away from the second insulating tube 22, so as to contact the external soil, seawater, etc. The second conductive portion 132 is at least partially immersed in the first solution 31 or the second solution 32 in the second accommodating cavity 221.

[0052] One end of the first electrode 11 is immersed in the solution in the first accommodating cavity 211, one end of the second electrode 12 is immersed in the solution in the first accommodating cavity 211, and the other end is immersed in the solution in the second accommodating cavity 221. The arrangement of the first electrode 11, the second electrode 12 and the third electrode 13 realizes the electrical connection between the first solution 31 and the second solution 32 and the external medium to be measured, thereby ensuring the normal operation of cathodic protection.

[0053] The arrangement of the first electrode 11 , the second electrode 12 and the third electrode 13 can connect the external medium to be measured, the first solution 31 and the second solution 32 in series in the working state of the reference electrode to form a potential measurement path.

[0054] The threshold temperature is a critical temperature at which the reference electrode can stabilize its own potential, and the value of the threshold temperature is related to the types of the first solution 31 and the second solution 32 .

[0055] The reference electrode provided in the embodiment of the present application, when the temperature is greater than the threshold temperature, if the solubility change per unit temperature of the first solution 31 is different from the solubility change per unit temperature of the second solution 32, then the concentration change per unit temperature of one of the first solution 31 and the second solution 32 is smaller than the concentration change per unit temperature of the other, and the overall potential drift of the reference electrode is suppressed, which is beneficial to improving the potential fluctuation of the reference electrode and improving the potential stability of the reference electrode; when the temperature is greater than the threshold temperature, if the first solution 31 and the second solution 32 have different change trends with temperature changes, then the concentration of one of the first solution 31 and the second solution 32 increases and the potential is negatively biased, while the concentration of the other decreases and the potential is positively biased, and the overall potential of the reference electrode is balanced, thereby achieving potential self-correction of the reference electrode.

[0056] In a specific embodiment, the first solution 31 is a saturated copper sulfate solution, and the second solution 32 is one or more of a saturated ferrous sulfate solution, a saturated potassium sulfate solution, a saturated calcium sulfate solution, and a saturated sodium sulfate solution.

[0057] Specifically, the copper sulfate solution uses copper sulfate powder dissolved in pure water or mineral water to form a saturated electrolyte, and the copper sulfate solution is combined with the first electrode 11 and the second electrode 12 to form an electrode; the second solution 32 uses one or more of ferrous sulfate powder, potassium sulfate powder, calcium sulfate powder and sodium sulfate powder, dissolved in pure water or mineral water to form a saturated electrolyte, and the second solution 32 is combined with the second electrode 12 and the second conductive part 132 of the third electrode 13 to form an electrode.

[0058] Exemplarily, the first containing chamber 211 contains the first solution 31, and the second containing chamber 221 contains the second solution 32, the second solution 32 is a saturated ferrous sulfate solution, and the second solution 32, the second electrode 12, and the third electrode 13 constitute a copper / saturated ferrous sulfate solution reference electrode system, and the threshold temperature is about 60°C. Ferrous sulfate ions can prevent the second electrode 12 and the third electrode 13 from oxidative ionization, which is conducive to forming a stable copper / saturated ferrous sulfate solution reference electrode system and improving the stability of the reference electrode. When the temperature of the first solution 31 and the second solution 32 is greater than the threshold temperature, the solubility of the first solution 31 increases with the increase of temperature, the concentration of the first solution 31 increases, and the electrode potential formed in the first containing chamber 211 is negatively biased; while the solubility of the second solution 32 decreases with the increase of temperature, the concentration of the second solution 32 decreases, and the electrode potential formed in the second containing chamber 221 is positively biased, balancing the negatively biased electrode potential, thereby playing a role in correcting and stabilizing the reference electrode potential.

[0059] Exemplarily, the first containing chamber 211 contains the first solution 31, and the second containing chamber 221 contains the second solution 32, the second solution 32 is a saturated potassium sulfate solution or a saturated calcium sulfate solution, and the second solution 32, the second electrode 12, and the third electrode 13 constitute a copper / saturated potassium sulfate solution reference electrode system or a copper / saturated calcium sulfate solution reference electrode system, and the threshold temperature is about 20°C. When the temperature of the first solution 31 and the second solution 32 is greater than the threshold temperature, the solubility of the first solution 31 increases with the increase of temperature, the concentration of the first solution 31 increases, and the electrode potential formed in the first containing chamber 211 is negatively biased; while the solubility of the second solution 32 changes less with the increase of temperature, and the concentration of the second solution 32 changes relatively insignificantly, and the electrode potential formed in the second containing chamber 221 is stable, and after being combined in series with the electrode formed in the first containing chamber 211, the overall potential fluctuation of the reference electrode can be suppressed, and the potential stability of the reference electrode can be improved.

[0060] Exemplarily, the first containing chamber 211 contains the first solution 31, and the second containing chamber 221 contains the second solution 32, the second solution 32 is a saturated sodium sulfate solution, and the second solution 32, the second electrode 12, and the third electrode 13 constitute a copper / saturated sodium sulfate solution reference electrode system, and the threshold temperature is about 40°C. Compared with the copper sulfate solution, the solubility of the sodium sulfate solution above the threshold temperature will be stable at a certain value. When the temperature of the first solution 31 and the second solution 32 is greater than the threshold temperature, the solubility of the first solution 31 increases with the increase of temperature, the concentration of the first solution 31 increases, and the electrode potential formed in the first containing chamber 211 is negatively biased; while the solubility of the second solution 32 hardly changes significantly with the increase of temperature, and the concentration of the second solution 32 hardly changes significantly. The electrode potential formed in the second containing chamber 221 is stable, and after being combined in series with the electrode formed in the first containing chamber 211, the overall potential fluctuation of the reference electrode can be suppressed, and the potential stability of the reference electrode can be improved.

[0061] Exemplarily, the second solution 32 may also be a mixed compound solution obtained by blending a saturated ferrous sulfate solution, a saturated potassium sulfate solution, a saturated calcium sulfate solution, and a saturated sodium sulfate solution in a certain proportion.

[0062] In a further embodiment, the reference electrode further comprises a first seal 41, a second seal 42 and a third seal 43, wherein the first seal 41 is disposed at one end of the first insulating tube 21 away from the second insulating tube 22, the second seal 42 is disposed between the first insulating tube 21 and the second insulating tube 22, and the third seal 43 is disposed between the second insulating tube 22 and the third insulating tube 23. The first electrode 11 is disposed through the first seal 41, the second electrode 12 is disposed through the second seal 42, and the second conductive portion 132 is disposed through the third seal 43.

[0063] Exemplarily, the first seal 41, the second seal 42 and the third seal 43 are made of non-metallic insulating materials, are resistant to acid and alkali, and high temperatures, are flexible and have elastic deformation capabilities. For example, the first seal 41, the second seal 42 and the third seal 43 can be made of silicone, rubber or other materials.

[0064] It can be understood that the first sealing member 41 , the second sealing member 42 and the third sealing member 43 are all provided with a central hole so that the first electrode 11 , the second electrode 12 or the third electrode 13 can be inserted therein.

[0065] By providing the first seal 41, the second seal 42 and the third seal 43, a sealed connection is achieved among the first insulating tube 21, the second insulating tube 22 and the third insulating tube 23, thereby preventing water seepage and short circuit at the joints, which would cause distortion or failure of the reference electrode test potential, and at the same time preventing the external environment from polluting the interior of the reference electrode and affecting the measurement accuracy.

[0066] In a further embodiment, the reference electrode further includes a plugging member 5, which is mounted on an end of the first sealing member 41 away from the second insulating tube 22 and abuts against the first sealing member 41. The first electrode 11 includes a third conductive portion 111 and a wire portion 112 connected to each other, the third conductive portion 111 is partially inserted into the first accommodating cavity 211, the wire portion 112 is passed through the plugging member 5, and the wire portion 112 is used to be electrically connected to an external potential testing device.

[0067] like Figure 1 As shown, the plugging member 5 is installed above the first sealing member 41. The plugging member 5 is used to isolate the interior of the reference electrode from the external environment to prevent oxygen from oxidizing the internal electrode, while preventing harmful ion contamination and solution leakage.

[0068] It can be understood that the blocking member 5 is provided with a central hole for inserting the first electrode 11 therein.

[0069] The third conductive part 111 of the first electrode 11 is conductive and can be made of metal copper, etc. The first conductive part 131 is inserted into the solution of the first accommodating chamber 211, and the wire part 112 is connected to the third conductive part 111 and electrically connected to the potential testing device to achieve potential measurement.

[0070] In an optional embodiment, the blocking member 5 and the first insulating tube 21 , the first insulating tube 21 and the second insulating tube 22 , and the second insulating tube 22 and the third insulating tube 23 are fixedly connected by bonding or other methods.

[0071] In another optional embodiment, the blocking piece 5 and the first insulating tube 21 , the first insulating tube 21 and the second insulating tube 22 , and the second insulating tube 22 and the third insulating tube 23 are all threadedly connected.

[0072] With the cooperation of threaded connection and multiple seals, the reference electrode can not only ensure sealing, but also has the advantage of easy disassembly. At the same time, in the process of tightening the threads, the internal air can be gradually squeezed out to prevent the air column from being squeezed during the advancement of the threads, causing the internal solution environment of the reference electrode to increase in pressure.

[0073] Exemplarily, the outer periphery of the blocking member 5 is provided with external threads, such as Figure 2As shown, both ends of the first insulating tube 21 in the length direction are provided with first threaded holes 212 with internal threads, and the plugging member 5 is screwed into the first threaded hole 212 above the first insulating tube 21 to achieve the connection between the plugging member 5 and the first insulating tube 21. Figure 2 As shown, the two first threaded holes 212 of the first insulating tube 21 are respectively communicated with the first accommodating cavity 211 .

[0074] For example, Figure 2 As shown, both ends of the second insulating tube 22 in the length direction are provided with protrusions 222, the size of the protrusions 222 is adapted to the size of the first threaded hole 212 of the first insulating tube 21, and the outer periphery of the protrusions 222 is provided with external threads, and the connection between the second insulating tube 22 and the first insulating tube 21 is achieved by screwing the protrusions 222 into the first threaded hole 212 below the first insulating tube 21.

[0075] For example, Figure 2 As shown, a second threaded hole 232 is formed at one end of the third insulating tube 23 close to the second insulating tube 22, and the second threaded hole 232 is provided with an internal thread. The size of the second threaded hole 232 matches the size of the raised portion 222 below the second threaded hole 232. The second insulating tube 22 and the third insulating tube 23 are connected by screwing the raised portion 222 below the second insulating tube 22 into the second threaded hole 232. The second threaded hole 232 is communicated with the third accommodating cavity 231.

[0076] In a specific embodiment, the assembly process of the reference electrode is:

[0077] The first conductive portion 131 of the third electrode 13 is embedded in the third accommodation cavity 231 of the third insulating tube 23;

[0078] The central hole of the third sealing member 43 passes through the second conductive portion 132 of the third electrode 13 and is installed in the second threaded hole 232 of the third insulating tube 23;

[0079] One of the protrusions 222 of the second insulating tube 22 passes through the second conductive part 132, is inserted into the second threaded hole 232 of the third insulating tube 23 and is tightened. During the process of tightening the thread, the third sealing member 43 is squeezed and deformed, so that the connection end surface of the second insulating tube 22 and the third insulating tube 23 is sealed;

[0080] Inject the prepared second solution 32 into the second containing cavity 221 of the second insulating tube 22;

[0081] The second electrode 12 is inserted into the central hole of the second sealing member 42, and the second sealing member 42 is installed in one of the first threaded holes 212 of the first insulating tube 21.

[0082] Insert the other protruding portion 222 of the second insulating tube 22 into the first threaded hole 212 where the second sealing member 42 is located and tighten the screw, so that one end of the second electrode 12 is inserted into the second accommodating cavity 221. During the process of tightening the threads, the second sealing member 42 is squeezed and deformed to achieve sealing of the connecting end faces of the first insulating tube 21 and the second insulating tube 22. Meanwhile, the deformation of the second sealing member 42 squeezes the second electrode 12 to achieve sealing isolation between the second sealing member 42 and the second insulating tube 22.

[0083] Injecting the prepared first solution 31 into the first containing chamber 211;

[0084] Install the first sealing member 41 in another first threaded hole 212 of the first insulating member;

[0085] The first electrode 11 is inserted into the first solution 31 in the first containing cavity 211 through the central hole of the first sealing member 41;

[0086] The center hole of the sealing member 5 is passed through the first electrode 11, inserted into the first threaded hole 212 and tightened. During the process of tightening the thread, the first sealing member 41 is squeezed and deformed to achieve the sealing of the connecting end faces of the sealing member 5 and the first insulating tube 21, and also achieve the isolation and sealing of the first solution 31 in the first containing cavity 211 from the external environment. During the tightening process, the air inside the reference electrode is gradually squeezed out to avoid the internal solution environment pressurization caused by squeezing the air column during the advancement process.

[0087] In a specific embodiment, the first electrode 11, the second conductive part 132 and the third conductive part 111 are all copper parts, which have good electrical conductivity, thermal conductivity and corrosion resistance, and can form a copper / saturated copper sulfate solution reference electrode system with the first solution 31, and form a copper / saturated sulfate solution reference electrode system with the second solution 32.

[0088] Optionally, the first conductive part 131 of the third electrode 13 is a high molecular conductive polymer, which is not doped with conductive metal powder, has conductivity after solidification, is hydrophobic and oleophilic, is resistant to acids, alkalis and salts, and can withstand temperatures ranging from -40°C to 200°C.

[0089] For example, liquid epoxy resin, liquid polyurethane, non-metallic doped conductive grease, and conductive polyurethane powder are used to configure the first conductive portion 131 in a ratio of 10 ml: 10 ml: 20 ml: 500 mg.

[0090] During the process of assembling the reference electrode, the first conductive part 131 is filled into the third accommodating cavity 231 , and after solidification, the first conductive part 131 and the third insulating tube 23 are solidified into one body.

[0091] In a specific embodiment, an insulating outer layer is disposed on the periphery of the wire portion 112 to prevent the reference electrode from leaking or short-circuiting.

[0092] Exemplarily, the first electrode 11 includes a main body made of copper, the part of the main body wrapped by the insulating outer layer forms the wire portion 112 , the exposed part of the main body forms the third conductive portion 111 , and the diameter of the wire portion 112 is greater than the diameter of the third conductive portion 111 .

[0093] Optionally, when the reference electrode is assembled, the intersection of the lead portion 112 and the third conductive portion 111 is located in the middle of the thickness direction of the first seal 41. When the first seal 41 is squeezed due to the plugging member 5 being screwed into the first threaded hole 212, the gap between the third conductive portion 111 and the insulating outer layer of the lead portion 112 can be reduced, thereby improving the sealing effect. It is understandable that the thickness direction of the first seal 41 is Figure 1 The vertical direction in .

[0094] In a specific embodiment, the transparency of the first insulating tube 21 , the second insulating tube 22 , the third insulating tube 23 and the blocking member 5 are all less than 30%.

[0095] In this embodiment, the first insulating tube 21, the second insulating tube 22, the third insulating tube 23 and the sealing member 5 are made of opaque or low-transmittance materials with low transparency. On the one hand, they play a certain heat insulating role to prevent the sunlight from the external environment from shining on the first solution 31 or the second solution 32 to cause the temperature to rise, affecting the solubility, concentration and potential of the reference electrode of the solution; on the other hand, they block ultraviolet rays to prevent ultraviolet rays from affecting the solution components.

[0096] In a specific embodiment, cinnabar powder is further added to the first solution 31 and the second solution 32. The cinnabar powder has a sterilizing effect to prevent the microorganisms and reproduction products in the first solution 31 and the second solution 32 from contaminating the solutions.

[0097] The amount of cinnabar powder added can be set according to actual needs, for example, 5 mg to 10 mg of cinnabar powder is added to every 100 ml of solution.

[0098] Furthermore, in the case where the second solution 32 includes a saturated ferrous sulfate solution, vitamin C powder is also added to the second solution 32. The vitamin C powder can prevent oxidation or crystallization of ferrous ions and activate crystallized ferrous sulfate, which is beneficial to stabilizing the solution system.

[0099] The amount of vitamin C powder added can be set according to actual needs, for example, 10 mg to 50 mg of vitamin C powder can be added to every 100 ml of solution.

[0100] In a second aspect, an embodiment of the present application further provides a cathodic protection system, comprising a reference electrode provided in any of the above embodiments.

[0101] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0102] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0103] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A reference electrode, characterized in that It comprises a first electrode (11), a second electrode (12), a third electrode (13), and a first insulating tube (21), a second insulating tube (22), and a third insulating tube (23) which are connected in sequence; The first insulating tube (21) is provided with a first accommodating cavity (211), and the second insulating tube (22) is provided with a second accommodating cavity (221); one of the first accommodating cavity (211) and the second accommodating cavity (221) contains a first solution (31), and the other contains a second solution (32); the first accommodating cavity (211) and the second accommodating cavity (221) are separated from each other; The third insulating tube (23) is provided with a third accommodating cavity (231); the third electrode (13) comprises a first conductive portion (131) and a second conductive portion (132) connected to each other; the first conductive portion (131) is accommodated in the third accommodating cavity (231) and at least partially extends to the outside of the third insulating tube (23); and the second conductive portion (132) partially extends into the second accommodating cavity (221); One end of the second electrode (12) is inserted into the second accommodating cavity (221) and is spaced apart from the second conductive portion (132), and the other end is inserted into the first accommodating cavity (211); One end of the first electrode (11) is inserted into the first accommodating cavity (211) and is spaced apart from the second electrode (12); Wherein, when the temperature is greater than a threshold temperature, the solubility change per unit temperature of the first solution (31) is different from the solubility change per unit temperature of the second solution (32); or, when the temperature is greater than a threshold temperature, the solubility of one of the first solution (31) and the second solution (32) increases with increasing temperature, while the solubility of the other decreases with increasing temperature.

2. The reference electrode according to claim 1, characterized in that The first solution (31) is a saturated copper sulfate solution, and the second solution (32) is one or more of a saturated ferrous sulfate solution, a saturated potassium sulfate solution, a saturated calcium sulfate solution, and a saturated sodium sulfate solution.

3. The reference electrode according to claim 1, characterized in that The reference electrode further comprises a first seal (41), a second seal (42) and a third seal (43), wherein the first seal (41) is arranged at an end of the first insulating tube (21) away from the second insulating tube (22), the second seal (42) is arranged between the first insulating tube (21) and the second insulating tube (22), and the third seal (43) is arranged between the second insulating tube (22) and the third insulating tube (23); The first electrode (11) is disposed through the first sealing member (41), the second electrode (12) is disposed through the second sealing member (42), and the second conductive portion (132) is disposed through the third sealing member (43).

4. The reference electrode according to claim 3, characterized in that The reference electrode further comprises a blocking member (5), wherein the blocking member (5) is mounted on an end of the first sealing member (41) away from the second insulating tube (22) and abuts against the first sealing member (41); The first electrode (11) comprises a third conductive portion (111) and a conductive wire portion (112) which are connected to each other; the third conductive portion (111) is partially inserted into the first accommodating cavity (211); the conductive wire portion (112) is passed through the blocking member (5); and the conductive wire portion (112) is used to be electrically connected to a potential testing device.

5. The reference electrode according to claim 4, characterized in that The blocking piece (5) and the first insulating tube (21), the first insulating tube (21) and the second insulating tube (22), and the second insulating tube (22) and the third insulating tube (23) are all threadedly connected.

6. The reference electrode according to claim 4, characterized in that An insulating outer layer is provided on the outer periphery of the conductor part (112).

7. The reference electrode according to claim 4, characterized in that The transparency of the first insulating tube (21), the second insulating tube (22), the third insulating tube (23) and the blocking member (5) is less than 30%.

8. The reference electrode according to claim 1, characterized in that Cinnabar powder is added to the first solution (31) and the second solution (32).

9. The reference electrode according to claim 8, characterized in that In the case where the second solution (32) includes a saturated ferrous sulfate solution, vitamin C powder is also added to the second solution (32).

10. A cathodic protection system, characterized in that: The reference electrode comprises the reference electrode as claimed in any one of claims 1 to 9.

Images