Corrosion-resistant rare earth aluminum-copper alloy grounding electrode

Abstract

The utility model provides a kind of corrosion -resistant rare earth aluminium copper alloy grounding electrode, through the composite structure of multiple aluminum copper alloy round bar cooperation spiral connecting layer and micropore protective sleeve, significantly improve corrosion resistance, drainage efficiency and installation convenience;Aluminum copper alloy strip's spiral gap is used to guide soil moisture to discharge quickly along the axial direction, reduce the electrochemical corrosion caused by ponding, form complete drainage path in combination with bottom cover drain hole, so that average corrosion rate is effectively reduced;Aluminum copper alloy round bar supports the flexible splicing and depth extension of grounding electrode, avoids welding defects and reduces the construction complexity of conductive carbon fiber reinforced polymer micropore protective sleeve, balance ion permeation and corrosion medium barrier through micropore structure, while carbon fiber reinforced layer ensures overall resistivity, meets electrical performance requirement;The sealing and drainage of top cover and bottom cover are designed in coordination, further prevent external impurities from invading and optimize drainage efficiency.

Description

Technical Field

[0001] This utility model relates to the field of grounding electrodes, and in particular to a corrosion-resistant rare earth aluminum-copper alloy grounding electrode. Background Technology

[0002] The grounding system in power engineering is a critical facility for ensuring the safe operation of electrical equipment. Its core function is to effectively conduct fault current or lightning current to the earth through grounding materials. Aluminum-copper alloys, combining the lightweight and high conductivity of aluminum with the corrosion resistance of copper, have been widely used in the field of grounding materials in recent years. In existing technologies, aluminum-copper alloy grounding systems mostly employ single rod or strip structures (such as the arc-shaped strips or round rods specified in DL / T 1918-2018), with shot peening and pre-oxidation treatments to improve corrosion resistance. However, this type of structure still has significant problems in practical applications:

[0003] Firstly, its corrosion resistance is insufficient. Although aluminum-copper alloys inhibit corrosion through surface oxide films, in complex soil environments (such as acidic / alkaline soils with pH = 5-10), long-term water accumulation or ion penetration can easily lead to local damage to the oxide film, accelerating material corrosion (such as dendritic segregation or delamination), making it difficult to meet the stringent requirement of an average corrosion rate ≤ 0.05 mm / a in the standard.

[0004] Secondly, drainage capacity is inadequate. Traditional grounding electrodes are mostly solid or simply encased structures, lacking active drainage design. Moisture in the soil easily lingers around the grounding electrode, forming an electrochemical corrosion microenvironment, further aggravating material wear (such as localized corrosion rates exceeding limits).

[0005] Third, installation flexibility is limited. Existing grounding electrodes mostly adopt welding or fixed length designs, which are difficult to adapt to complex terrain or depth requirements. Frequent cutting or splicing is required during construction, which can easily introduce the risk of poor welding.

[0006] Furthermore, existing protective layer technologies (such as asphalt coatings or single polymer coatings) suffer from insufficient conductivity, low mechanical strength, or poor air permeability, making it difficult to balance corrosion resistance and conductivity stability. Therefore, designing an aluminum-copper alloy grounding electrode that combines efficient drainage, modular expansion, and multi-layer protection has become a key technical challenge for improving the reliability of power grounding systems. Utility Model Content

[0007] The purpose of this invention is to provide a corrosion-resistant rare-earth aluminum-copper alloy grounding electrode to solve the problems existing in the prior art.

[0008] To achieve the above objectives, this utility model provides the following solution:

[0009] This utility model provides a corrosion-resistant rare-earth aluminum-copper alloy grounding electrode, comprising:

[0010] An aluminum-copper alloy round bar, wherein the aluminum-copper alloy round bar is composed of multiple segments connected sequentially;

[0011] An intermediate spiral connecting layer is disposed on the outside of the aluminum-copper alloy round bar;

[0012] A microporous protective sleeve is disposed outside the intermediate spiral connecting layer.

[0013] In one implementation, the multiple segments of the aluminum-copper alloy round bars are connected by threads.

[0014] In one embodiment, the side of the aluminum-copper alloy round bar is connected to a copper busbar via a wire.

[0015] In one embodiment, the top of the aluminum-copper alloy round bar at the very top is provided with a top cover, and a handle is provided in the middle of the top cover.

[0016] In one implementation, the intermediate spiral connecting layer is made of aluminum-copper alloy strip spirally wound, and the spiral gap forms a drainage channel.

[0017] In one embodiment, the bottom of the lowest aluminum-copper alloy round bar is provided with a bottom cover, and the side of the bottom cover is provided with a drainage hole, which is connected to the drainage channel.

[0018] In one embodiment, the microporous protective sleeve uses a conductive carbon fiber reinforced polymer layer, which is bonded into a cylindrical structure by conductive adhesive and wrapped around the outside of the intermediate spiral connecting layer.

[0019] The present invention achieves the following beneficial technical effects compared to the prior art:

[0020] This invention provides a corrosion-resistant rare-earth aluminum-copper alloy grounding electrode. Through a composite structure of multiple aluminum-copper alloy round bars, a spiral connecting layer, and a microporous protective sleeve, it significantly improves corrosion resistance, drainage efficiency, and ease of installation. The spiral gaps in the aluminum-copper alloy strip guide soil moisture to drain rapidly along the axial direction, reducing electrochemical corrosion caused by water accumulation. Combined with the drainage holes in the bottom cover, a complete drainage path is formed, effectively reducing the average corrosion rate. The aluminum-copper alloy round bars support flexible splicing and depth expansion of the grounding electrode, avoiding welding defects and reducing construction complexity. The conductive carbon fiber reinforced polymer microporous protective sleeve balances ion penetration and corrosive media barrier through its microporous structure, while the carbon fiber reinforcement layer ensures overall resistivity, meeting electrical performance requirements. The combined sealing and drainage design of the top and bottom covers further prevents external impurities from entering and optimizes drainage efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of a corrosion-resistant rare-earth aluminum-copper alloy grounding electrode structure provided by this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] The purpose of this invention is to provide a corrosion-resistant rare-earth aluminum-copper alloy grounding electrode to solve the problems existing in the prior art.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1:

[0027] This embodiment provides a corrosion-resistant rare-earth aluminum-copper alloy grounding electrode, such as... Figure 1 As shown, it includes:

[0028] Aluminum-copper alloy round bar 1 is made of aluminum-copper alloy round bar conforming to DL / T 1918-2018 standard, with copper content of 3%-5% and rare earth content of 0.1%-0.3%. The surface is shot peening and pre-oxidation treatment to form a rough surface with Ra=5-8μm and a dense oxide film. Aluminum-copper alloy round bar 1 is made of multiple segments and connected sequentially.

[0029] The intermediate spiral connecting layer 2 is disposed on the outside of the aluminum-copper alloy round bar 1;

[0030] Microporous protective sleeve 3 is disposed outside the intermediate spiral connecting layer 2.

[0031] In one implementation, the multi-segment aluminum-copper alloy round bar 1 is connected by threads, which can be internal threads and external threads machined at both ends of the round bar.

[0032] In one embodiment, the side of the aluminum-copper alloy round bar 1 is connected to the copper busbar 5 via a wire 4.

[0033] As one implementation, the top of the aluminum-copper alloy round bar 1 is provided with a top cover 6, and the top cover 6 is provided with a handle 7 in the middle, which improves the sealing performance and facilitates deployment.

[0034] As one implementation method, the intermediate spiral connecting layer 2 is made of aluminum-copper alloy strip spirally wound, and the spiral gap forms a drainage channel 8, which guides soil moisture to be discharged quickly along the axial direction, reducing electrochemical corrosion caused by water accumulation.

[0035] As one implementation method, the bottom of the aluminum-copper alloy round bar 1 at the bottom is provided with a bottom cover 9, and the side of the bottom cover 9 is provided with a drainage hole 10. The drainage hole 10 is connected to the drainage channel 8, thereby forming a complete drainage path and effectively reducing the average corrosion rate.

[0036] As one implementation method, the microporous protective sleeve 3 uses a conductive carbon fiber reinforced polymer layer, which is bonded into a cylindrical structure by conductive adhesive and wrapped around the outside of the middle spiral connecting layer. The microporous structure balances ion penetration and blocks corrosive media, while the carbon fiber reinforcement layer ensures the overall resistivity and meets the electrical performance requirements.

[0037] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A corrosion-resistant rare-earth aluminum-copper alloy grounding electrode, characterized in that: include: An aluminum-copper alloy round bar, wherein the aluminum-copper alloy round bar is composed of multiple segments connected sequentially; An intermediate spiral connecting layer is disposed on the outside of the aluminum-copper alloy round bar; A microporous protective sleeve is disposed outside the intermediate spiral connecting layer.

2. The corrosion-resistant rare-earth aluminum-copper alloy grounding electrode according to claim 1, characterized in that: The multiple aluminum-copper alloy round bars are connected by threads.

3. The corrosion-resistant rare-earth aluminum-copper alloy grounding electrode according to claim 1, characterized in that: The side of the aluminum-copper alloy round bar is connected to the copper busbar via a wire.

4. The corrosion-resistant rare-earth aluminum-copper alloy grounding electrode according to claim 1, characterized in that: The top of the aluminum-copper alloy round bar at the very top is provided with a top cover, and a handle is provided in the middle of the top cover.

5. The corrosion-resistant rare-earth aluminum-copper alloy grounding electrode according to claim 1, characterized in that: The intermediate spiral connecting layer is made of aluminum-copper alloy strip spirally wound, and the spiral gap forms a drainage channel.

6. The corrosion-resistant rare-earth aluminum-copper alloy grounding electrode according to claim 5, characterized in that: The bottom of the aluminum-copper alloy round bar at the very bottom is provided with a bottom cover, and the side of the bottom cover is provided with a drainage hole, which is connected to the drainage channel.

7. The corrosion-resistant rare-earth aluminum-copper alloy grounding electrode according to claim 1, characterized in that: The microporous protective sleeve is made of conductive carbon fiber reinforced polymer layer, which is bonded into a cylindrical structure by conductive adhesive and wrapped around the outside of the intermediate spiral connecting layer.

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