Long-life polarization probe and manufacturing method thereof

Abstract

The invention provides a long-life polarization probe which comprises a shell, the interior of the shell is divided into an inner cabin and a liquid supplementing cabin, a copper rod is arranged in the inner cabin, the inner cabin is filled with a mixture of copper sulfate crystals and a water retention material and a copper sulfate saturated solution, a liquid leakage hole is formed in the bottom of the inner cabin, and the liquid supplementing cabin is filled with the copper sulfate saturated solution. A natural test piece and a polarization test piece are arranged at the bottom of the liquid supplementing cabin, the natural test piece, the polarization test piece and the copper bar are connected with wires, a liquid supplementing pipe is arranged between the inner cabin and the liquid supplementing cabin and can guide liquid in the liquid supplementing cabin to the inner cabin, a plurality of through holes are formed in the outer side wall of the liquid supplementing cabin, and one-way water seepage films are arranged in the through holes. Water can seep into the liquid supplementing cabin through the one-way water seepage film. Water in the soil can enter the liquid supplementing cabin of the polarization probe through the one-way water seepage film for water supplementing. Water in the liquid supplementing cabin is supplemented to the inner cabin through the liquid supplementing pipe, and copper sulfate crystals in the inner cabin are dissolved in the water to form a copper sulfate saturated solution, so that the service life of the polarization probe is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of polarization probes, and in particular, to a long-life polarization probe and a manufacturing method thereof. Background Art

[0002] The polarization probe is an important component in the cathodic protection system. The polarization probe is a long-term, highly stable, IR-drop eliminating buried steel pipeline cathodic protection potential measurement probe, mainly applicable to the detection and monitoring of cathodic protection potential in corrosion control projects of buried and underwater steel pipelines.

[0003] Commonly used polarization probes generally have a service life of only about 5 - 8 years due to fast leakage and ineffective water replenishment and water retention. However, with the rapid development of the domestic pipeline storage and transportation industry, the construction of large storage tanks and long-distance pipelines is increasing. Generally, the designed service life of the cathodic protection system for large storage tanks and long-distance pipelines is more than 20 years. However, the service life of the polarization probe for detection and monitoring always fails to meet the requirements of the cathodic protection system and cannot be used in matching with it. Especially for large storage tanks, most of the polarization probes are pre-embedded in the foundation. It is very difficult to replace them when they fail and no very good remedial measures have been found, which brings great trouble to the cathodic protection designers and users. Therefore, it is very necessary to develop a new type of long-life polarization probe. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a long-life polarization probe and a manufacturing method thereof, which have the characteristics of long service life and stable effect.

[0005] The specific technical solution is as follows: A long-life polarization probe includes a housing, which is divided into an inner chamber and a liquid replenishment chamber. A copper rod is arranged in the inner chamber. The inner chamber is filled with a mixture of copper sulfate crystals and a water retention material and a copper sulfate saturated solution. A liquid leakage hole is arranged at the bottom of the inner chamber. The liquid replenishment chamber is filled with a copper sulfate saturated solution. A natural test piece and a polarization test piece are respectively arranged at the bottom of the liquid replenishment chamber. The natural test piece, the polarization test piece and the copper rod are respectively connected to a wire. A liquid replenishment pipe is arranged between the inner chamber and the liquid replenishment chamber. The liquid replenishment pipe can drain the liquid in the liquid replenishment chamber to the inner chamber. A plurality of through holes are arranged on the outer side wall of the liquid replenishment chamber. A one-way water permeable membrane is arranged in the through holes, and water can seep into the liquid replenishment chamber through the one-way water permeable membrane.

[0006] A porous ceramic is arranged at the bottom of the inner chamber, and the holes in the porous ceramic serve as the liquid leakage holes.

[0007] The cross-section of the holes in the porous ceramic is trapezoidal. The bottom side of the trapezoid close to the inner chamber is the upper bottom side, and the length of the upper bottom side of the trapezoid is greater than the length of the lower bottom side.

[0008] The liquid replenishment pipe is a U-shaped capillary tube.

[0009] The bottom of the polarization specimen is higher than the bottom of the liquid leakage hole.

[0010] The water retention material is one or more of polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate.

[0011] The housing includes an outer cylinder, a bottom cover, a top cover, and an inner cylinder. The outer cylinder and the inner cylinder are respectively installed on the bottom cover. The outer cylinder is sleeved outside the inner cylinder and is coaxially arranged. The inner cylinder is lower than the outer cylinder. An inner cover is provided at the top of the inner cylinder, and a top cover is provided at the top of the outer cylinder. A sealing material is filled between the top cover and the inner cover. A natural specimen and a polarization specimen are respectively installed on the bottom cover between the inner cylinder and the outer cylinder. The bottom cover, the inner cylinder, and the inner cover form an inner chamber. The bottom cover, the inner cylinder, the outer cylinder, and the inner cover form a liquid supplement chamber. A liquid leakage hole is provided in the center of the bottom cover of the inner chamber, and a sealing material is provided at the bottom of the liquid supplement chamber.

[0012] The manufacturing method of the above-mentioned long-life polarization probe includes the following steps. S1 Install the natural specimen, porous ceramic, and polarization specimen on the bottom cover in sequence. S2 Connect cables to the natural specimen and the polarization specimen respectively. S3 Install the inner cylinder on the bottom cover and install a liquid supplement pipe. S4 Pour the mixture of copper sulfate and water retention material into the inner cylinder, install a copper rod and connect a cable. S5 Install the outer cylinder on the bottom cover, then pour the sealing material between the inner cylinder and the outer cylinder. After the sealing material is cured, pour the saturated copper sulfate solution between the inner cylinder and the outer cylinder. S6 Install the inner cover into the outer cylinder, then pour the sealing material into the outer cylinder above the inner cover. After the sealing material, install the top cover.

[0013] The beneficial effects of the present invention are as follows: When the polarization probe is buried in the soil and starts to work, the saturated copper sulfate solution in the inner chamber is continuously consumed. The saturated copper sulfate solution in the liquid supplement chamber can supply liquid to the inner chamber through the liquid supplement pipe. After the saturated copper sulfate solution in the liquid supplement chamber is consumed, when it rains, the water in the soil can enter the liquid supplement chamber of the polarization probe through the one-way water permeable membrane for water replenishment. The water in the liquid supplement chamber replenishes water to the inner chamber through the liquid supplement pipe. The copper sulfate crystals in the inner chamber dissolve in the water to form a saturated copper sulfate solution, so as to improve the service life of the polarization probe.

[0014] Among them, the water retention material can absorb, release, and preserve a certain amount of water, reduce the outflow speed of the copper sulfate solution to the soil medium, prevent the copper sulfate solution from being consumed too quickly, and can further increase the service life of the polarization probe.

[0015] The liquid replenishing tube adopts a U-shaped capillary tube, and the saturated copper sulfate solution in the outer chamber flows into the inner chamber through the U-shaped capillary tube in the way of siphon principle to achieve the function of liquid replenishment.

[0016] The liquid leakage hole adopts porous ceramics. The cross-section of the holes in the porous ceramics is trapezoidal. The length of the bottom side of the trapezoid close to the inner chamber is greater than the bottom side close to the outside. The holes of the porous ceramics are conical, with the inner side larger and the outer side smaller during installation, which can effectively slow down the leakage rate of the copper sulfate solution and further increase the service life of the polarization probe. The bottom of the polarization test piece is higher than the bottom of the liquid leakage hole, so that the saturated copper sulfate solution leaked from the liquid leakage hole does not contact the polarization test piece, preventing electrochemical reactions from occurring at the polarization test piece and thus affecting the detection accuracy of the polarization probe. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them: Figure 1 It is a schematic structural diagram of the present invention; Figure 2 is Figure 1 A-A cross-sectional view of Outer cylinder 1, bottom cover 2, top cover 3, inner cylinder 4, inner cover 5, sealing material 6, natural test piece 7, polarization test piece 8, copper rod 9, wire 10, liquid replenishing tube 11, through hole 12, one-way water permeable membrane 13, liquid leakage hole 14. Detailed Embodiments

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention in conjunction with the drawings of the specification. Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0019] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0020] Embodiment 1 Such as Figure 1-2As shown in the figure, a long-life polarization probe includes a housing, which includes an outer cylinder 1, a bottom cover 2, a top cover 3 and an inner cylinder 4. The bottom cover 2 is respectively installed with the outer cylinder 1 and the inner cylinder 4. The outer cylinder 1 is sleeved outside the inner cylinder 4 and is coaxially arranged. The inner cylinder 4 is lower than the outer cylinder 1. An inner cover 5 is arranged at the top of the inner cylinder 4, and a top cover 3 is arranged at the top of the outer cylinder 1. A sealing material 6 (fluorinated rubber is used in this embodiment) is filled between the top cover 3 and the inner cover 5. Natural test pieces 7 and polarization test pieces 8 are respectively installed on the bottom cover 2 between the inner cylinder 4 and the outer cylinder 1.

[0021] The bottom cover 2, the inner cylinder 4 and the inner cover 5 form an inner chamber, and a copper rod 9 is arranged in the inner chamber. The natural test piece 7, the polarization test piece 8 and the copper rod 9 are respectively connected to a wire 10. The inner chamber is filled with a mixture of copper sulfate crystals and a water-retaining material and a copper sulfate saturated solution. The water-retaining material can be selected from one or more of polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate. A porous ceramic is arranged on the bottom cover 2 at the inner chamber, and the holes on the porous ceramic serve as liquid leakage holes 14. The bottom of the polarization test piece 8 is higher than the bottom of the liquid leakage holes 14. The cross-section of the holes arranged on the porous ceramic is trapezoidal. The bottom side of the trapezoid close to the inner chamber is the upper bottom side, and the length of the upper bottom side of the trapezoid is greater than the length of the lower bottom side.

[0022] The bottom cover 2, the inner cylinder 4, the outer cylinder 1 and the inner cover 5 form a liquid replenishment chamber, and the liquid replenishment chamber is filled with a copper sulfate saturated solution. A sealing material 6 is arranged at the bottom of the liquid replenishment chamber. The sealing material 6 is used for sealing to prevent the copper sulfate solution or water in the liquid replenishment chamber from contacting the natural test piece 7 and the polarization test piece 8. A liquid replenishment pipe 11 (a U-shaped capillary is used in this embodiment) is arranged between the inner chamber and the liquid replenishment chamber. The liquid replenishment pipe 11 can drain the liquid in the liquid replenishment chamber to the inner chamber. A plurality of through holes 12 are arranged on the outer side wall of the liquid replenishment chamber, and a one-way water permeable membrane 13 is arranged in the through holes 12. Water can seep into the liquid replenishment chamber through the one-way water permeable membrane 13 (the composite fiber membrane with one-way water permeable performance consists of two layers of structures. One side is a hydrophilic layer, which is composed of hydrophilic polymers such as polyvinyl alcohol, cellulose acetate, and polyacrylate, and can allow water to pass through; the other side is a hydrophobic layer, which is composed of polymers such as polyurethane, polystyrene, polymethyl methacrylate or polycaprolactone, and prevents water from passing through).

[0023] The bottom cover 2, the inner cylinder 4 and the inner cover 5 form an inner chamber. A copper rod 9 is arranged in the inner chamber. The inner chamber is filled with a mixture of copper sulfate crystals and a water retention material and a copper sulfate saturated solution. The water retention material can be selected from one or more of polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate. A liquid leakage hole is arranged on the bottom cover 2 at the inner chamber. In this embodiment, a porous ceramic is arranged on the bottom cover 2 at the inner chamber, and the holes of the porous ceramic are used as the liquid leakage holes. The cross-section of the holes arranged on the porous ceramic is trapezoidal, and the length of the bottom side of the trapezoid close to the inner chamber is greater than the bottom side close to the outside. The bottom cover 2, the inner cylinder 4, the outer cylinder 1 and the inner cover 5 form a liquid replenishing chamber.

[0024] The manufacturing method of the above long-life polarization probe includes the following steps: S1 Install the natural test piece 7, the porous ceramic, and the polarization test piece 8 on the bottom cover 2 in sequence; S2 Connect the cables to the natural test piece 7 and the polarization test piece 8 respectively; S3 Install the inner cylinder 4 on the bottom cover 2 and install the liquid replenishing pipe 11; S4 Pour the mixture of copper sulfate and the water retention material into the inner cylinder 4, install the copper rod 9 and connect the cable; S5 Install the outer cylinder 1 on the bottom cover 2, then pour the sealing material 6 between the inner cylinder 4 and the outer cylinder 1. After the sealing material 6 is cured, pour the saturated copper sulfate solution between the inner cylinder 4 and the outer cylinder 1; S6 Install the inner cover 5 into the outer cylinder 1, then pour the sealing material 6 into the outer cylinder 1 above the inner cover 5. After the sealing material 6 is cured, install the top cover 3.

[0025] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A long-life polarization probe, characterized in that: It includes a housing, which is divided into an inner chamber and a liquid replenishment chamber. A copper rod is arranged in the inner chamber. A mixture of copper sulfate crystals and a water retention material and a copper sulfate saturated solution are filled in the inner chamber. A liquid leakage hole is arranged at the bottom of the inner chamber. The liquid replenishment chamber is filled with a copper sulfate saturated solution. A natural specimen and a polarized specimen are respectively arranged at the bottom of the liquid replenishment chamber. The natural specimen, the polarized specimen and the copper rod are respectively connected to wires. A liquid replenishment pipe is arranged between the inner chamber and the liquid replenishment chamber. The liquid replenishment pipe can drain the liquid in the liquid replenishment chamber to the inner chamber. A plurality of through holes are arranged on the outer side wall of the liquid replenishment chamber. A one-way water permeable membrane is arranged in the through holes, and water can permeate into the liquid replenishment chamber through the one-way water permeable membrane.

2. The long-life polarization probe according to claim 1, characterized in that: A porous ceramic is arranged at the bottom of the inner chamber, and the holes of the porous ceramic serve as the liquid leakage holes.

3. The long-life polarization probe according to claim 2, wherein: The cross section of the holes in the porous ceramic is trapezoidal. The bottom side of the trapezoid close to the inner chamber is the upper bottom side, and the length of the upper bottom side of the trapezoid is greater than the length of the lower bottom side.

4. The long-life polarization probe according to claim 1, characterized in that: The liquid replenishment pipe is a U-shaped capillary tube.

5. The long-life polarization probe according to claim 1, wherein: The bottom of the polarized specimen is higher than the bottom of the liquid leakage hole.

6. The long-life polarization probe according to claim 1, wherein: The water retention material is one or more of polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate.

7. The long-life polarization probe according to claim 1, characterized in that: The housing includes an outer cylinder, a bottom cover, a top cover and an inner cylinder. The outer cylinder and the inner cylinder are respectively installed on the bottom cover. The outer cylinder is sleeved outside the inner cylinder and is coaxially arranged. The inner cylinder is lower than the outer cylinder. An inner cover is arranged at the top of the inner cylinder. A top cover is arranged at the top of the outer cylinder. A sealing material is filled between the top cover and the inner cover. The natural specimen and the polarized specimen are respectively installed on the bottom cover between the inner cylinder and the outer cylinder. The bottom cover, the inner cylinder and the inner cover form the inner chamber. The bottom cover, the inner cylinder, the outer cylinder and the inner cover form the liquid replenishment chamber. A liquid leakage hole is arranged at the center of the bottom cover of the inner chamber. A sealing material is arranged at the bottom of the liquid replenishment chamber.

8. The manufacturing method of the long-life polarization probe according to any one of claims 1-7, characterized in that: It includes the following steps S1 Install the natural specimen, the porous ceramic and the polarized specimen on the bottom cover in sequence; S2 Connect the natural specimen and the polarized specimen to cables respectively; S3 Install the inner cylinder on the bottom cover and install the liquid replenishment pipe; S4 Pour the mixture of copper sulfate and the water retention material into the inner cylinder, install the copper rod and connect it to the cable; S5 Install the outer cylinder on the bottom cover, then pour the sealing material between the inner cylinder and the outer cylinder. After the sealing material is cured, pour the saturated copper sulfate solution between the inner cylinder and the outer cylinder; S6 Install the inner cover into the outer cylinder, then pour the sealing material into the outer cylinder above the inner cover. After the sealing material is cured, install the top cover.

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