Marine anti-corrosion nonmetal shell type auxiliary anode

Abstract

The utility model discloses a marine anti-corrosion nonmetal shell type auxiliary anode which comprises a polyurethane shell and an anode bar, a stepped hole and a positioning plate which are integrally formed are arranged at the two ends of the interior of the polyurethane shell respectively, and a plurality of via holes are formed in the polyurethane shell between the stepped hole and the positioning plate. The positioning plate is provided with a positioning hole, the threaded column at the tail end of the anode bar penetrates through the positioning hole and is locked through a first nut, the inner diameter of the small end of the stepped hole is larger than the outer diameter of the anode bar, the large end of the stepped hole is a glue pouring cavity, and the threaded column at the head end of the anode bar is arranged in the glue pouring cavity and connected with a cable through a connecting piece. And sealant is arranged in the sealant filling cavity. The utility model has the advantages of simple assembly, good insulation and anticorrosion effects, high use quality, and eradication of hydrogen embrittlement phenomenon.

Description

Technical Field

[0001] The utility model relates to the technical field of ocean engineering, in particular to an ocean anti-corrosion non-metallic shell type auxiliary anode. Background Art

[0002] Offshore wind power generation technology mainly utilizes the rich wind energy resources in the ocean to convert wind energy into electrical energy through wind turbines. Offshore wind power generation has great development potential. The reference electrode for offshore wind power generation is a key component in the impressed current cathodic protection system, mainly used to prevent the corrosion of the wind power foundation structure; the impressed current cathodic protection method is one of the electrochemical protection methods. In the impressed current cathodic protection system, the electrode connected to the positive pole of the DC power supply is called the auxiliary anode. Its function is to enable the impressed cathodic current to flow from the anode through the medium to the protected body, forming a current loop. The electrochemical performance, mechanical performance, process performance of the auxiliary anode, as well as the shape and arrangement method of the anode, etc. all have important impacts on the cathodic protection effect.

[0003] For the auxiliary anode used in the seawater wind power impressed current cathodic protection system, a carbon steel metal shell is usually adopted. An insulator needs to be installed between the anode rod and the metal shell, and it is fixed by filling and sealing glue. After long-term operation, there is a risk that the sealing glue will peel off from the metal shell or the insulator, with a relatively high risk.

[0004] Moreover, the auxiliary anode shell is made of carbon steel structure and is not resistant to seawater corrosion. It also needs to be painted or sprayed with plastic for anti-corrosion, increasing the processing steps and production costs. Once the anti-corrosion coating on the surface of the auxiliary anode metal shell peels off and the distance between the anode rod and the metal shell is too small, hydrogen gas will be generated on the metal shell, and hydrogen embrittlement is likely to occur. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide an ocean anti-corrosion non-metallic shell type auxiliary anode, which has simple assembly, good insulation and anti-corrosion effects, high use quality, and eliminates the occurrence of hydrogen embrittlement phenomenon.

[0006] To solve the above technical problem, the utility model provides an ocean anti-corrosion non-metallic shell type auxiliary anode, including a polyurethane shell and an anode rod. Integrally formed step holes and positioning plates are respectively arranged at both ends inside the polyurethane shell. A plurality of through holes are arranged on the polyurethane shell between the step holes and the positioning plates. A positioning hole is arranged on the positioning plate. The threaded column at the tail end of the anode rod passes through the positioning hole and is locked by a first nut. The inner diameter of the small end hole of the step hole is larger than the outer diameter of the anode rod. The large end of the step hole is a glue filling cavity. The threaded column at the head end of the anode rod is arranged in the glue filling cavity and is connected to a cable through a connecting piece. Sealing glue is arranged in the glue filling cavity.

[0007] Further, a spacer ring is provided at the head end of the anode rod, and the spacer ring is placed on the step in the stepped hole.

[0008] Further, an upper cover is provided at the top of the stepped hole.

[0009] Further, a polyurethane flange is provided on the outer periphery of the polyurethane housing on one side of the stepped hole.

[0010] Further, an extension connector is further included, and the extension connector is installed on the polyurethane flange.

[0011] Further, the extension connector includes a first connection flange and a second connection flange, and an extension pipe is provided between the first connection flange and the second connection flange.

[0012] Further, the extension pipe includes a first seamless pipe, a bent pipe and a second seamless pipe which are welded and fixed in sequence. The first seamless pipe is welded and fixed to the first connection flange, and the second seamless pipe is welded and fixed to the second connection flange.

[0013] Further, reinforcing ribs are provided between the bent pipe and the first seamless pipe and between the bent pipe and the second seamless pipe.

[0014] Advantages of the utility model:

[0015] 1. The polyurethane housing is a polymer material with good electrical insulation performance. Compared with the traditional carbon steel housing, it has good seawater corrosion resistance and does not require additional anti-corrosion treatment, thus improving the service life.

[0016] 2. Since the polyurethane housing is a non-metallic material, no hydrogen embrittlement will occur between it and the anode rod.

[0017] 3. Based on the adoption of the polyurethane housing, the lower end of the anode rod is fixed by bolts, eliminating the need for filling sealant, reducing production steps and production costs. Moreover, there is no need to use insulating pads or other structures to isolate between the anode rod and the polyurethane housing, further improving production convenience and reducing costs.

[0018] 4. The weight of the polyurethane housing is significantly reduced compared with that of the carbon steel material, facilitating on-site installation and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 is a schematic cross-sectional structure diagram of the assembly of the polyurethane housing and the anode rod of the utility model;

[0021] Figure 3It is an enlarged schematic diagram of the connection at the head end of the anode rod of the present utility model;

[0022] Figure 4 It is an enlarged schematic diagram of the connection at the tail end of the anode rod of the present utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the extension connector of the present utility model. Detailed implementation manners

[0024] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited do not limit the present utility model.

[0025] Refer to Figures 1 to 4 As shown, an embodiment of the marine anti-corrosion non-metallic shell type auxiliary anode of the present utility model includes a polyurethane shell 1 and an anode rod 2. Integrally formed stepped holes 3 and positioning plates 4 are respectively arranged at both ends inside the polyurethane shell. A plurality of through holes 111 are arranged on the polyurethane shell between the stepped holes and the positioning plates to facilitate seawater to flow through and contact the anode rod. A positioning hole 5 is arranged on the positioning plate. The threaded column at the tail end of the anode rod passes through the positioning hole and is locked by a first nut 6. The positioning plate can fix the anode plate inside the polyurethane shell. The inner diameter of the small end hole of the stepped hole is larger than the outer diameter of the anode rod, facilitating the anode rod to be inserted downward into the polyurethane shell from the stepped hole position. The large end of the stepped hole is a glue filling cavity. The threaded column at the head end of the anode rod is arranged in the glue filling cavity and is connected to a cable 8 through a connector 7. A sealing glue 9 is arranged in the glue filling cavity. The sealing glue wraps and seals the connector and the cable to avoid contact with seawater. At the same time, the sealing glue also has a fixing function.

[0026] The weight of the above-mentioned polyurethane shell is significantly reduced compared with the carbon steel shell, and it is integrally insulated, without the problem of hydrogen embrittlement. Due to the integral insulation, when it is installed with the anode rod, no additional insulation means are required, greatly reducing the number of components, improving the assembly efficiency, and reducing the assembly defect problems caused by multiple components.

[0027] And at the tail end part of the polyurethane shell, due to the integral insulation, there is no need to use sealing glue for insulation and sealing here. The threaded column of the anode rod can be directly exposed in seawater, playing the role of the anode rod and increasing the contact area with seawater. Since there is no need to fill and seal with sealing glue here, the production steps can be reduced and the production cost can be lowered.

[0028] In order to ensure that the sealing glue will not flow below the stepped hole during glue filling, a spacer ring 10 is also arranged at the head end of the anode rod. The spacer ring is placed on the step in the stepped hole. Its function is to prevent the leakage of the sealing glue during glue filling, and the plastic spacer ring directly falls on the step, which is convenient for assembly and also eliminates the use of sealing rings.

[0029] After the sealant injection is completed, in order to position the cable before the sealant cures, an upper cover 11 is provided at the top of the stepped hole, and the cable passes through the wire outlet hole in the middle of the upper cover. A polyurethane flange 12 is provided on the outer periphery of the polyurethane housing on one side of the stepped hole for fixation.

[0030] When assembling the above structure, first pass the cable through the upper cover, then crimp the copper nose. Slide the spacer ring onto the threaded post at the upper end (i.e., the head end) of the anode body and fix it to one end of the anode rod with a nut. Subsequently, fix the copper nose to this threaded post with another nut, and perform soldering treatment at the connection to improve conductivity. Then insert the anode rod into the stepped hole in the upper part of the polyurethane housing and place it on the positioning plate at the lower end (i.e., the tail end) of the polyurethane housing. The threaded post on the anode rod passes through the positioning plate and is locked with a first nut. At this time, the anode rod can be fixed to the polyurethane housing, and the spacer ring is lapped on the step in the stepped hole of the polyurethane housing.

[0031] Subsequently, pour the sealant until the sealant liquid level is close to the upper end face of the stepped hole. Then apply some sealant to one end of the upper cover and press it against the stepped hole. An installation groove can be provided at the end of the stepped hole to fix the installation position of the upper cover, ensure that the upper end cover contacts the sealant, and the sealant fills the cavity. Wait for the sealant to cure to complete the assembly.

[0032] Refer to Figure 1 and Figure 5 As shown, in some environments with installation restrictions, an extension connector 13 is also designed. The extension connector is installed on the polyurethane flange, and the extension connector can change the installation form and position of the auxiliary anode to meet the restriction requirements.

[0033] Specifically, the extension connector includes a first connection flange 14 and a second connection flange 15. An extension tube is provided between the first connection flange and the second connection flange. The extension tube includes a first seamless tube 16, a bent tube 17, and a second seamless tube 18 that are welded and fixed in sequence. The first seamless tube is welded and fixed to the first connection flange, and the second seamless tube is welded and fixed to the second connection flange. The bent tube is also made of seamless pipe material, which can effectively improve the service life. Through the intervention of the bent tube, the auxiliary anode that is axially fixed in the installation position can be changed to a radial installation.

[0034] Reinforcing ribs 19 are provided between the above-mentioned bent tube and the first seamless tube and between the bent tube and the second seamless tube to improve the overall strength, so that the wall thickness of the first seamless tube, the bent tube, and the second seamless tube can be reduced, reducing the manufacturing cost.

[0035] For the design-based extended connector, after the installation of the polyurethane housing and the anode rod, it is also necessary to apply sealant to the end face of the polyurethane flange of the polyurethane housing, place a rubber flange gasket, apply sealant to the end face of the second connecting flange, and clamp and fix the two with bolts; the cable passes through the second connecting flange, passes through the extension pipe and then passes out from the first connecting flange, and silicone sealant is injected at the passing-out position for secondary sealing treatment, thus completing the assembly.

[0036] For the auxiliary anode described above, the polyurethane material is used as the housing, which has the effect of insulating the body. The exposure of metal materials will not occur due to the corrosion of seawater, so the occurrence of hydrogen embrittlement is eliminated. Moreover, the diameter of the polyurethane housing can be appropriately reduced, and it only needs to meet the requirement that seawater can flow into the interior from the through holes to contact the anode rod. The manufacturing cost is controlled, the overall weight is greatly reduced, and the installation difficulty is lowered.

[0037] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention.

Claims

1. An auxiliary anode with a marine anti-corrosion non-metallic housing, characterized in that, It includes a polyurethane outer shell and an anode rod. On both ends inside the polyurethane outer shell, there are integrally formed stepped holes and positioning plates respectively. There are multiple through holes on the polyurethane outer shell between the stepped holes and the positioning plates. There is a positioning hole on the positioning plate. The threaded post at the tail end of the anode rod passes through the positioning hole and is locked by a first nut. The inner diameter of the small end hole of the stepped hole is larger than the outer diameter of the anode rod. The large end of the stepped hole is a glue filling cavity. The threaded post at the head end of the anode rod is arranged in the glue filling cavity and is connected to a cable through a connecting piece. There is sealing glue in the glue filling cavity.

2. The marine anti-corrosion non-metallic shell type auxiliary anode according to claim 1, characterized in that, There is also a spacer ring arranged on the head end of the anode rod, and the spacer ring is placed on the step inside the stepped hole.

3. The marine anti-corrosion non-metallic shell type auxiliary anode according to claim 1, characterized in that, There is an upper cover arranged at the top of the stepped hole.

4. The marine anti-corrosion non-metallic shell type auxiliary anode according to claim 1, wherein There is a polyurethane flange arranged on the outer periphery of the polyurethane outer shell on one side of the stepped hole.

5. The marine anti-corrosion non-metallic shell type auxiliary anode according to claim 4, characterized in that It also includes an extension connector, and the extension connector is installed on the polyurethane flange.

6. The marine anti-corrosion non-metallic shell type auxiliary anode according to claim 5, wherein, The extension connector includes a first connecting flange and a second connecting flange, and there is an extension pipe arranged between the first connecting flange and the second connecting flange.

7. The marine anti-corrosion non-metallic shell type auxiliary anode according to claim 6, characterized in that, The extension pipe includes a first seamless pipe, a bent pipe and a second seamless pipe which are welded and fixed in sequence. The first seamless pipe is welded and fixed to the first connecting flange, and the second seamless pipe is welded and fixed to the second connecting flange.

8. The marine anti-corrosion non-metallic casing type auxiliary anode according to claim 7, characterized in that, There are reinforcing ribs arranged between the bent pipe and the first seamless pipe and between the bent pipe and the second seamless pipe.

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