Steel rail insulation protection device for preventing stray current corrosion
By setting an insulating wrapping layer and coating at the rail fastener nodes, the problem of reduced insulation performance between the rail and the ground is solved, achieving waterproof, dustproof, and anti-fouling insulation protection, and improving the long-term effectiveness and safety of the rail fastener system.
Patent Information
- Application Number
- CN202423182266.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In DC-electric urban rail transit systems, the insulation between the rails and the ground gradually fails over time, leading to stray current leakage. This causes electro-corrosion of the rails, track bed reinforcement, and steel structures in tunnels, affecting train operation safety and increasing maintenance costs.
Insulation wrapping and coating are used to cover the rail fastener joints to enhance the insulation performance of the rail fastener system. The polymer coating is waterproof, dustproof and dirt-proof, and through holes and protective bosses are set to improve the long-term insulation performance.
It effectively extends the creepage distance along the rail surface, enhances the rail-to-ground transition resistance, prevents contaminant intrusion, and improves the insulation durability and overall insulation performance of the fastener system. It is suitable for both new and old line upgrades.
Smart Images
Figure CN223646864U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of urban rail transit line equipment, specifically a rail insulation protection device for preventing stray current corrosion. Background Technology
[0002] In DC-electric urban rail transit systems, the running rails are used as return circuits for current return. However, in the complex environment of subways, the rails cannot achieve complete insulation from the ground. Some current will always return or leak into the ground on non-designated routes due to insulation problems, thus forming stray currents, also known as stray currents.
[0003] Currently, the rails are physically insulated from the ground by gauge blocks and rail pads in the fastener system. The rail fastener system meets insulation requirements in theoretical design and testing. However, in actual operation, over time, it is inevitably affected by pollution factors such as dust, iron filings, and moisture. This causes the creepage resistance at the fastener joints to be much lower than the physical insulation resistance of the fastener body. In addition, the performance of the insulating components in the fastener system deteriorates, leading to the gradual failure of the insulation between the rails and the ground, resulting in current leakage.
[0004] The effects of stray current leakage are mainly as follows:
[0005] 1. It causes electrolytic corrosion to the rails, track bed reinforcement, and steel structure inside the tunnel, shortening their service life;
[0006] 2. It causes electrolytic corrosion to buried oil and gas pipelines along the subway line, creating safety hazards and increasing maintenance costs;
[0007] 3. It causes potential changes between the rails and the traction substation frame, making the equipment unable to work properly and affecting train operation safety.
[0008] In summary, there is an urgent need to study a measure to strengthen insulation, to compensate for the deficiencies of existing insulation measures, thereby improving the overall insulation performance of the fastener system and solving the stray current problem. Utility Model Content
[0009] To address the shortcomings of the existing technology, this utility model provides a rail insulation protection device for preventing stray current corrosion, which is waterproof, dustproof, anti-fouling, and corrosion-resistant, effectively improving the long-term insulation performance of the rail fastening system.
[0010] To achieve the above objectives, this utility model provides a rail insulation protection device for preventing stray current corrosion, comprising an insulating wrapping layer and a first insulating coating layer;
[0011] The insulating wrapping layer covers the rail base and both sides of the rail web at the rail fastener node, and the length of the insulating wrapping layer is longer than the length of the rail fastener.
[0012] The first insulating coating is applied to the rail at the position where it meets the edge of the insulating wrapping layer.
[0013] In one embodiment, the insulating wrapping layer has through holes that allow the rail fasteners to pass through, and the portion of the rail surface corresponding to the through holes is coated with a second insulating coating.
[0014] In one embodiment, the wall of the through hole is provided with a first protective boss extending upward.
[0015] In one embodiment, the edge of the second insulating coating is aligned with the wall of the through hole.
[0016] In one embodiment, both the first insulating coating and the second insulating coating are made of hydrophobic, oil-repellent, and flashover-resistant polymer coatings.
[0017] In one embodiment, the edge of the insulating wrapping layer is provided with an upwardly extending second protective protrusion.
[0018] In one embodiment, the insulating wrapping layer is integrally molded from a high-resistivity rubber or polyurethane material.
[0019] In one embodiment, the insulating wrapping layer is fixed to the rail by adhesive.
[0020] In one embodiment, the first insulating coating is applied to the rail by extending a certain distance outward from the edge of the insulating coating layer and the boundary line where they meet the rail.
[0021] Compared with the prior art, the present invention has the following beneficial technical effects:
[0022] 1. The rail insulation protection device of this utility model extends the creepage distance of the rail surface by setting an insulating wrapping layer at the fastener node of the rail, thereby increasing the rail-to-ground transition resistance. At the same time, by setting an insulating coating as a sealing and isolation interface that is difficult to be contaminated, it fully covers and seals the interface between the insulating wrapping layer and the rail surface, making it waterproof, dustproof, dirtproof and corrosion-resistant, enhancing the durability of the insulating wrapping layer adhesion, thereby improving the long-term insulation performance of the fastener system.
[0023] 2. In the preferred embodiment of the rail insulation protection device of this utility model, the insulation wrapping layer is designed with an opening, so that the fastener can pass through the through hole on the insulation wrapping layer to fasten the rail, while not changing the parts and assembly relationship of the original fastener system. It has strong versatility and can be applied to both new line construction and old line renovation.
[0024] 3. In the preferred embodiment of the rail insulation protection device of this utility model, a first protective boss and a second protective boss are provided, which effectively block water, drain sewage and prevent dust, and further enhance the overall insulation performance of the original fastener system. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.
[0026] Figure 1 This is a cross-sectional view of the rail insulation protection device in the installation state in an embodiment of this utility model;
[0027] Figure 2 This is a top view of the installation state of the rail insulation protection device in this embodiment of the utility model;
[0028] Figure 3 This is a schematic diagram of the insulating wrapping layer in an embodiment of the present invention.
[0029] Reference numerals: 1. Insulating wrapping layer; 101. Through hole; 102. First protective boss; 103. Second protective boss; 2. First insulating coating; 3. Rail; 4. Rail fastener; 5. Second insulating coating.
[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0031] 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.
[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0033] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0036] like Figures 1 to 3 The diagram shows an insulation protection device for preventing stray current corrosion of a rail 3 disclosed in this embodiment. It mainly includes an insulating wrapping layer 1 and a first insulating coating layer 2. Specifically, the insulating wrapping layer 1 is disposed on the portion of the rail 3 with rail fasteners 4, and covers the bottom and sides of the rail 3. The insulating wrapping layer 1 is preferably fixed to the rail 3 by adhesive. The length of the insulating wrapping layer 1 is longer than the length of the rail fasteners 3, allowing the rail fasteners 4 to secure the rail 3 via the insulation protection device. The first insulating coating layer 2 is applied to the rail 3 at the edge where it meets the insulating wrapping layer 1. Specifically, the first insulating coating layer 2 extends outward from the boundary between the edge of the insulating wrapping layer 1 and the rail 3 by a certain distance, for example, 3cm to 10cm.
[0037] In this embodiment, the rail 3 insulation protection device extends the surface creepage distance of the rail 3 by setting an insulating wrapping layer 1 at the fastener node of the rail, thereby increasing the rail-to-ground transition resistance. At the same time, by setting a first insulating coating 2 as a sealing and isolation interface that is difficult to be contaminated, it fully covers and seals the interface between the insulating wrapping layer 1 and the surface of the rail 3, making it waterproof, dustproof, dirtproof and corrosion-resistant, enhancing the adhesion durability of the insulating wrapping layer 1, thereby improving the long-term insulation performance of the fastener system.
[0038] In a preferred embodiment, the insulating wrapping layer 1 has through holes 101 through which the rail fastener 4 can pass. A second insulating coating 5 is applied to a portion of the rail surface corresponding to the through holes 101, with the edge of the second insulating coating 5 aligned with the wall of the through hole 101. This means that the rail fastener 4 passes through the through hole 101 and rests on the second insulating coating 5, thus fastening the rail 3. This improves the long-term insulation performance of the fastener system without altering the original fastener system's parts and assembly relationships, enhancing the versatility of the rail 3 insulation protection device in this embodiment. This allows it to be applied to both new line construction and old line renovation.
[0039] In a preferred embodiment, the wall of the through hole 101 is provided with an upwardly extending first protective boss 102, and / or the edge of the insulating wrapping layer 1 is provided with an upwardly extending second protective boss 103. By providing the first protective boss 102 and the second protective boss 103, the water blocking, sewage discharge and dust prevention functions are effectively achieved, and the overall insulation performance of the original fastener system is further enhanced.
[0040] In this embodiment, the insulating wrapping layer 1 is integrally molded from high-resistivity rubber or polyurethane material, and the first insulating coating 2 and the second insulating coating 5 are both made of hydrophobic, oil-repellent and flashover-resistant polymer coatings. Of course, in specific applications, other insulating materials can also be used to prepare the insulating wrapping layer 1, the first insulating coating 2 and the second insulating coating 5.
[0041] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A rail insulation protection device for preventing stray current corrosion, characterized in that, Includes an insulating wrapping layer and a first insulating coating; The insulating wrapping layer covers the rail base and both sides of the rail web at the rail fastener node, and the length of the insulating wrapping layer is longer than the length of the rail fastener. The first insulating coating is applied to the rail at the position where it meets the edge of the insulating wrapping layer.
2. The rail insulation protection device for preventing stray current corrosion according to claim 1, characterized in that, The insulating wrapping layer has through holes that allow the rail fasteners to pass through, and the portion of the rail surface corresponding to the through holes is coated with a second insulating coating.
3. The rail insulation protection device for preventing stray current corrosion according to claim 2, characterized in that, The through hole has an upwardly extending first protective protrusion on its wall.
4. The rail insulation protection device for preventing stray current corrosion according to claim 2, characterized in that, The edge of the second insulating coating is aligned with the wall of the through hole.
5. The rail insulation protection device for preventing stray current corrosion according to any one of claims 2 to 4, characterized in that, Both the first insulating coating and the second insulating coating are made of hydrophobic, oil-repellent, and flashover-resistant polymer coatings.
6. The rail insulation protection device for preventing stray current corrosion according to any one of claims 1 to 4, characterized in that, The edge of the insulating wrapping layer is provided with an upwardly extending second protective protrusion.
7. The rail insulation protection device for preventing stray current corrosion according to any one of claims 1 to 4, characterized in that, The insulating wrapping layer is integrally molded from high-resistivity rubber or polyurethane material.
8. The rail insulation protection device for preventing stray current corrosion according to any one of claims 1 to 4, characterized in that, The insulating wrapping layer is fixed to the rail by adhesive.
9. The rail insulation protection device for preventing stray current corrosion according to any one of claims 1 to 4, characterized in that, The first insulating coating is applied to the rail by extending a certain distance outward from the edge of the insulating coating layer and the boundary line where they meet the rail.