Anti-corrosion serpentine spring coupling

Abstract

The utility model relates to the technical field of couplings, in particular to an anti-corrosion serpentine spring coupling which comprises a coupling body, a protection assembly and a sealing assembly. The protection assembly comprises an elastic sheath, a flow guide groove, an anti-corrosion coating and a self-repairing layer and is used for guiding liquid to be discharged and providing long-acting protection. The sealing assembly comprises a sealing ring, a pressing ring, an exhaust hole and an isolating membrane, and the sealing performance and internal and external pressure balance are ensured. In addition, galvanic corrosion is reduced by additionally arranging a conductive layer and an insulating spacer, moisture is prevented from entering through an air inlet and a filter screen, and the overall strength is improved through reinforcing ribs. By optimizing materials and structural design, the durability and stability of the coupling in a complex environment are remarkably improved, and the service life is prolonged.

Description

A rust-resistant serpentine spring coupling Technical Field

[0001] This utility model belongs to the technical field of mechanical transmission and connecting parts, specifically a rust-resistant serpentine spring coupling. Background Technology

[0002] With the development of coupling technology, various flexible couplings have been widely used in mechanical transmission systems, especially in applications requiring the transmission of large torques, vibration absorption, and compensation for shaft misalignment. Serpentine spring couplings, due to their compact structure, excellent buffering performance, and high load-bearing capacity, are widely used in mining, metallurgy, shipbuilding, and heavy machinery. However, in actual use, serpentine springs exposed to humid, corrosive media or outdoor environments for extended periods are highly susceptible to corrosion. This leads to a decrease in spring elasticity, a shortened fatigue life, and even fracture failure, seriously affecting the safety and reliability of equipment operation.

[0003] A search revealed a patent, CN107855390B, which discloses a serpentine spring for couplings and its manufacturing process, published on April 19, 2019. This patent proposes coating the outer wall of the serpentine spring with a fluorocarbon coating. Utilizing the excellent chemical inertness of the fluorocarbon coating, it provides protection against acids, alkalis, salts, and various chemical solvents, thereby reducing the possibility of electrochemical corrosion. While this solution improves the corrosion resistance of the serpentine spring to some extent, it still has significant shortcomings: First, the fluorocarbon coating is a surface covering; if it is locally damaged during installation or operation due to mechanical collisions or friction, the base metal will be exposed, forming the starting point for electrochemical corrosion, and the protective effect will drastically decrease. Second, the coating lacks self-healing capabilities and cannot cope with the problem of micro-crack propagation under long-term dynamic stress, resulting in limited protective durability. Third, this technology only treats the spring body and does not address the collaborative rust prevention design of other metal components in the overall coupling structure (such as the hub and spring seat), resulting in insufficient systemic protection.

[0004] A search revealed a patent, CN113606259B, which discloses a hub assembly and coupling for a maintenance-free serpentine spring coupling, published on April 19, 2022. This patent proposes to achieve automatic reset and sealing protection of the outer casing by setting a compression spring and a limiting ring structure in the hub assembly, thereby reducing the entry of external impurities and achieving the goal of "maintenance-free." This structure improves the working environment of the coupling to a certain extent and delays the contamination and wear of the internal spring. However, it still has significant shortcomings in terms of rust prevention: First, this solution focuses on mechanical limiting and structural sealing, without taking active anti-corrosion measures for the serpentine spring itself or its installation environment, such as anti-rust coatings, anti-corrosion materials, or environmental isolation designs; second, its sealing structure relies on the relative movement between the outer casing and the hub, and long-term reciprocating motion can easily lead to aging and failure of the seals, allowing moisture and corrosive media to still penetrate the interior; third, it does not consider the problem of galvanic corrosion between metal parts in high humidity or salt spray environments, lacks insulation or coating isolation designs for different metal contact surfaces, and has limited overall rust prevention capabilities.

[0005] The aforementioned problems indicate that while existing serpentine spring couplings have made some progress in structural optimization, vibration reduction, and maintenance-free design, they still have significant shortcomings in systemic corrosion prevention, particularly lacking a long-term, stable protection mechanism against corrosive environments. Therefore, existing technologies are insufficient to meet the demands for long-life, high-reliability operation of couplings under harsh conditions (such as humid, salt spray, and chemical environments).

[0006] Therefore, this utility model proposes a rust-resistant serpentine spring coupling, which aims to achieve comprehensive and long-lasting rust protection for the serpentine spring and key metal components by optimizing material selection, structural sealing and surface protection through coordinated design, thereby improving the durability and operational stability of the coupling in complex environments and making up for the shortcomings of the prior art. Summary of the Invention

[0007] This utility model relates to a rust-resistant serpentine spring coupling, comprising a coupling body, a protective component, and a sealing component. The protective component is installed inside the coupling body, and the sealing component is provided on the outside of the coupling body.

[0008] The protective assembly includes an elastic sleeve, flow guide grooves, an anti-corrosion coating, and a self-healing layer. The elastic sleeve is symmetrically arranged inside the coupling body. Multiple flow guide grooves are formed on the outer wall of the elastic sleeve. The inner wall of the flow guide grooves is coated with an anti-corrosion coating, and the surface of the anti-corrosion coating is covered with the self-healing layer. The elastic sleeve is fixed to the inner wall of the coupling body by bolts, and both ends of the elastic sleeve are flush with the two end faces of the coupling body. The flow guide grooves are evenly distributed along the length of the elastic sleeve to guide the liquid medium to drain quickly, preventing liquid from remaining on the surface of the elastic sleeve for extended periods. The anti-corrosion coating is made of epoxy resin substrate mixed with nano-oxide particles, exhibiting excellent acid and alkali resistance and corrosion resistance. The self-healing layer is composed of a polymer material containing microcapsules. When cracks appear on the coating surface, the microcapsules rupture, releasing a repair agent to fill the cracks, thereby restoring the integrity of the coating.

[0009] The sealing assembly includes a sealing ring, a clamping ring, a vent, and a separating membrane. Sealing rings are nested at both ends of the coupling body, and a clamping ring is positioned on the outer side of each sealing ring. The clamping ring is fixedly connected to the end of the coupling body via a threaded structure. The inner wall of the sealing ring fits against the outer wall of the coupling body, and the thickness of the sealing ring matches the width of the end face of the coupling body. A vent is formed on the inner wall of the clamping ring, and a separating membrane is positioned at the outlet end of the vent. The separating membrane is made of polytetrafluoroethylene (PTFE), which is breathable and waterproof, effectively preventing moisture from entering the coupling while allowing gas to escape to balance the internal and external pressure differences.

[0010] Preferably, the coupling body has symmetrical positioning bosses at both ends, and the outer wall of the positioning boss has a slot. The inner wall of the sealing ring has a locking block corresponding to the slot. The locking block and the slot are connected by an interference fit to ensure that the sealing ring will not be displaced or loosened during installation.

[0011] The protective assembly also includes a conductive layer and an insulating gasket. The inner wall of the elastic sheath is coated with a conductive layer, and an insulating gasket is adhered to the surface of the conductive layer. The insulating gasket is fixed to the inner wall of the elastic sheath by adhesive bonding. The conductive layer is made of graphene, which has excellent conductivity and can guide the galvanic corrosion current between metal components to the external circuit, thereby reducing the risk of electrochemical corrosion. The insulating gasket is used to isolate direct contact between different metal components, further reducing the occurrence of galvanic corrosion.

[0012] An air inlet is provided on one side of the coupling body. A filter screen is installed on the inner wall of the air inlet, and the surface of the filter screen is coated with a hydrophobic coating to prevent external moisture and corrosive media from entering the coupling. The outlet end of the air inlet is connected to the internal cavity of the coupling body, and the position of the air inlet corresponds to the exhaust hole of the sealing component, forming a gas flow path to keep the internal environment of the coupling dry.

[0013] The outer wall of the coupling body is symmetrically provided with reinforcing ribs. The inner side of the reinforcing ribs is welded to the inner wall of the coupling body. The outer side of the reinforcing ribs is provided with an anti-corrosion coating. The thickness of the anti-corrosion coating is the same as the height of the reinforcing ribs, which is used to enhance the overall strength and corrosion resistance of the coupling.

[0014] The elastic sleeve has connecting flanges at both ends. Threaded holes are formed on the outer walls of the connecting flanges, and fastening bolts are installed in these holes. The ends of the fastening bolts penetrate the connecting flanges and are fixedly connected to the end face of the coupling body. A sealing gasket is provided on the inner wall of the connecting flange. The sealing gasket is made of silicone material, which has good elasticity and sealing performance, effectively preventing liquid from seeping into the coupling from the connecting flange.

[0015] This invention addresses the problem of reduced protective effectiveness caused by coating damage in serpentine springs in existing technologies by incorporating protective components, including an elastic sleeve, a guide groove, an anti-corrosion coating, and a self-healing layer, thereby extending the service life of the coupling. By adding a sealing component, combining a sealing ring, a pressure ring, a vent, and an isolation membrane, it solves the problem of moisture intrusion due to aging and failure of seals in existing technologies, improving the coupling's sealing performance. Furthermore, by adding a conductive layer and insulating gaskets, it solves the problem of galvanic corrosion between metal components, further enhancing the coupling's corrosion resistance in high humidity or salt spray environments.

[0016] The specific implementation of the above technical solution is as follows: The elastic sheath is fixed to the inner wall of the coupling body by bolts, and the guide groove on its surface guides the liquid to drain quickly. The anti-corrosion coating and the self-healing layer work together to provide long-term protection. The sealing ring is installed at both ends of the coupling body by the interference fit of the locking block and the locking groove. The compression ring is fixed to the sealing ring by the thread structure. The exhaust hole and the isolation membrane form a gas flow path. The conductive layer and the insulating gasket are fixed to the inner wall of the elastic sheath by adhesive to prevent galvanic corrosion. The air inlet and the filter screen block the entry of external moisture, and the reinforcing ribs improve the overall strength of the coupling. The connecting flange is fixed by fastening bolts, and the sealing gasket provides additional sealing protection.

[0017] This utility model achieves comprehensive protection for the serpentine spring and key metal components through the synergistic effect of optimized material selection, structural design and surface treatment, significantly improving the durability and operational stability of the coupling in complex environments and making up for the shortcomings of the prior art. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 is a schematic diagram of the outer structure of the self-healing layer.

[0020] Figure 3 is a schematic diagram of the outer structure of the clamping ring.

[0021] Figure 4 is a schematic diagram of the outer structure of the anti-corrosion coating.

[0022] Figure 5 is a schematic diagram of the outer structure of the connecting flange.

[0023] The attached diagram is labeled as follows: 1. Coupling body; 2. Elastic sleeve; 3. Guide groove; 4. Anti-corrosion coating; 5. Self-healing layer; 6. Sealing ring; 7. Compression ring; 8. Exhaust hole; 9. Isolation membrane; 10. Air inlet; 11. Filter screen; 12. Reinforcing rib; 13. Connecting flange; 14. Fastening bolt; 15. Sealing gasket. Detailed Implementation

[0024] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] Specific implementation examples are given below.

[0026] This utility model relates to a rust-resistant serpentine spring coupling, the structure of which is shown in Figure 1. It mainly includes a coupling body 1, a protective component, and a sealing component. The protective component is installed inside the coupling body 1, while the sealing component is located outside the coupling body 1. In the protective component, an elastic sleeve 2 is bolted to the inner wall of the coupling body 1, and both ends of the elastic sleeve 2 are flush with the two end faces of the coupling body 1. Multiple guide grooves 3 are formed on the outer wall of the elastic sleeve 2, evenly distributed along the length of the elastic sleeve 2, to guide the liquid medium to drain quickly and avoid stagnation. The inner wall of the guide grooves 3 is coated with an anti-corrosion coating 4, and the surface of the anti-corrosion coating 4 is further covered with a self-healing layer 5. The anti-corrosion coating 4 is made of epoxy resin substrate mixed with nano-oxide particles, exhibiting excellent acid and alkali resistance. The self-healing layer 5 is composed of a polymer material containing microcapsules. When cracks appear on the coating surface, the microcapsules rupture, releasing a repair agent to fill the cracks, thereby restoring the integrity of the coating. As shown in Figure 2, the distribution of the flow channel 3 and the coverage relationship between the anti-corrosion coating 4 and the self-healing layer 5 are clearly visible.

[0027] The sealing assembly includes a sealing ring 6, a clamping ring 7, a vent 8, and an isolation membrane 9. The sealing ring 6 is nested at both ends of the coupling body 1 and positioned by an interference fit between a locking block and a locking groove. The locking groove is located on the outer wall of the positioning bosses at both ends of the coupling body 1, and a locking block is provided at a corresponding position on the inner wall of the sealing ring 6. The two form a tight connection to prevent displacement or loosening. A clamping ring 7 is provided on the outer side of the sealing ring 6, and the clamping ring 7 is fixedly connected to the end of the coupling body 1 by a threaded structure. A vent 8 is provided on the inner wall of the clamping ring 7, and an isolation membrane 9 is provided at the outlet end of the vent 8. The isolation membrane 9 is made of polytetrafluoroethylene (PTFE) material, which is both breathable and waterproof. The isolation membrane 9 allows gas to escape to balance the internal and external pressure difference, while preventing moisture from entering the interior of the coupling body 1. As shown in Figure 3, the specific connection method and functional layout of the sealing ring 6, clamping ring 7, vent 8, and isolation membrane 9 are shown in detail.

[0028] To enhance protection against galvanic corrosion, the protective assembly also includes a conductive layer and an insulating gasket. The conductive layer, made of graphene, is coated on the inner wall of the elastic sleeve 2 and possesses excellent conductivity. It guides the galvanic corrosion current between metal components to the external circuit, thereby reducing the risk of electrochemical corrosion. An insulating gasket is adhered to the surface of the conductive layer and is fixed to the inner wall of the elastic sleeve 2 by adhesive bonding. This gasket isolates direct contact between different metal components, further reducing the occurrence of galvanic corrosion. As shown in Figure 2, the positional relationship between the conductive layer and the insulating gasket is clearly defined, facilitating actual assembly operations.

[0029] An air inlet 10 is provided on one side of the coupling body 1. A filter screen 11 is installed on the inner wall of the air inlet 10. The surface of the filter screen 11 is coated with a hydrophobic coating, which can effectively prevent external moisture and corrosive media from entering the interior of the coupling body 1. The outlet end of the air inlet 10 is connected to the internal cavity of the coupling body 1, and its position corresponds to the exhaust port 8 of the sealing assembly, forming a gas flow path, thereby keeping the internal environment of the coupling body 1 dry. As shown in Figure 4, the distribution of the air inlet 10 and the filter screen 11 and their relative relationship with the reinforcing rib 12 are clearly visible.

[0030] The outer wall of the coupling body 1 is symmetrically provided with reinforcing ribs 12. The inner side of the reinforcing ribs 12 is welded to the inner wall of the coupling body 1, and the outer surface is coated with an anti-corrosion coating 4. The thickness of the anti-corrosion coating 4 is consistent with the height of the reinforcing ribs 12 to enhance the overall strength and corrosion resistance of the coupling. As shown in Figure 4, the distribution and structural features of the reinforcing ribs 12 are clearly presented.

[0031] The elastic sleeve 2 has connecting flanges 13 at both ends. The outer wall of each connecting flange 13 has threaded holes, into which fastening bolts 14 are installed. The ends of the fastening bolts 14 pass through the connecting flange 13 and are fixedly connected to the end face of the coupling body 1. A sealing gasket 15 is provided on the inner wall of the connecting flange 13. The sealing gasket 15 is made of silicone material, possessing good elasticity and sealing performance, effectively preventing liquid from seeping into the coupling body 1 from the connecting flange 13. Figure 5 shows the detailed installation of the connecting flange 13, fastening bolts 14, and sealing gasket 15.

[0032] In the specific implementation process, the elastic sleeve 2 is first fixed to the inner wall of the coupling body 1 with bolts, ensuring that its two ends are flush with the two side end faces of the coupling body 1. Then, multiple guide grooves 3 are machined on the outer wall of the elastic sleeve 2, and an anti-corrosion coating 4 and a self-healing layer 5 are coated on its inner wall to provide long-term protection. Next, the sealing ring 6 is installed at both ends of the coupling body 1 through an interference fit between the locking block and the locking groove, and the sealing ring 6 is fixed by the threaded structure of the clamping ring 7. An isolation membrane 9 is installed at the outlet end of the vent hole 8 on the inner wall of the clamping ring 7 to ensure unobstructed gas flow while preventing moisture intrusion. The conductive layer and insulating gasket are fixed to the inner wall of the elastic sleeve 2 by adhesive bonding to complete the galvanic corrosion protection measures. A filter screen 11 is installed inside the air inlet 10 and coated with a hydrophobic coating to ensure that external moisture cannot enter the interior of the coupling body 1. Finally, the connecting flange 13 is fixed to both ends of the elastic sleeve 2 by fastening bolts 14, and a sealing gasket 15 is installed on the inner wall of the connecting flange 13 to provide additional sealing protection.

[0033] This invention achieves comprehensive protection for the serpentine spring and key metal components through the synergistic effect of the aforementioned structural design and material selection. In practical applications, such as chemical plants or marine environments where couplings are exposed to high humidity or salt spray conditions for extended periods, this invention can significantly extend service life and improve operational stability. To better enable those skilled in the art to fully understand and implement this invention, the following supplementary explanation of its implementation principles is provided in conjunction with specific application scenarios.

[0034] In chemical plants or marine environments, serpentine spring couplings are exposed to high humidity, salt spray, or corrosive media for extended periods. To ensure stable operation under harsh conditions, this invention achieves comprehensive rust prevention through a multi-layered protective design and a synergistic mechanism. The working principle is explained in detail below with reference to the accompanying drawings and specific steps.

[0035] First, after the coupling body 1 is installed, the elastic sleeve 2 is fixed to the inner wall of the coupling body 1 with bolts, and its two ends are flush with the two side end faces of the coupling body 1. The guide grooves 3 on the outer wall of the elastic sleeve 2 are evenly distributed along its length to guide the liquid medium to drain quickly, avoiding liquid stagnation that could lead to localized corrosion. As shown in Figure 2, the inner wall of the guide grooves 3 is coated with an anti-corrosion coating 4 and a self-healing layer 5. The anti-corrosion coating 4 is made of epoxy resin substrate mixed with nano-oxide particles, which can effectively block the erosion of acidic and alkaline media; while the self-healing layer 5 is composed of polymer material containing microcapsules. When cracks occur on the coating surface due to mechanical impact or friction, the microcapsules rupture and release a repair agent to fill the cracks, thereby restoring the integrity of the coating. This design significantly extends the service life of the elastic sleeve 2 and reduces the problem of base metal exposure due to coating damage.

[0036] Secondly, at both ends of the coupling body 1, the sealing rings 6 are positioned by the interference fit between the locking blocks and the locking grooves, and further fixed by the threaded structure of the clamping rings 7. As shown in Figure 3, an isolation membrane 9 is provided at the outlet end of the vent hole 8 opened on the inner wall of the clamping ring 7. The isolation membrane 9 is made of polytetrafluoroethylene (PTFE) material, which is both breathable and waterproof, allowing gas to escape to balance the internal and external pressure difference, while preventing moisture from entering the interior of the coupling body 1. This design solves the problem of seal aging and failure in the prior art, ensuring the sealing performance of the coupling under long-term dynamic stress.

[0037] Furthermore, to reduce the risk of galvanic corrosion, the inner wall of the elastic sleeve 2 is coated with a conductive layer made of graphene, which has excellent conductivity and can guide the galvanic corrosion current between metal components to the external circuit, thereby reducing the occurrence of electrochemical corrosion. An insulating gasket is attached to the surface of the conductive layer and is fixed to the inner wall of the elastic sleeve 2 by adhesive bonding, used to isolate direct contact between different metal components. As shown in Figure 2, the positional relationship between the conductive layer and the insulating gasket is clear, facilitating actual assembly operations. This design effectively solves the problem of galvanic corrosion between metal components in high humidity or salt spray environments.

[0038] Furthermore, the air inlet 10 further enhances the coupling's moisture resistance. As shown in Figure 4, a filter screen 11 is installed on the inner wall of the air inlet 10. The surface of the filter screen 11 is coated with a hydrophobic coating, which can effectively prevent external moisture and corrosive media from entering the coupling body 1. The outlet end of the air inlet 10 connects to the internal cavity of the coupling body 1, forming a gas flow path with the exhaust port 8 of the sealing assembly, keeping the internal environment of the coupling dry. This design ensures the long-term stability of the coupling in humid environments.

[0039] The outer wall of the coupling body 1 is symmetrically provided with reinforcing ribs 12. The inner side of the reinforcing ribs 12 is welded to the inner wall of the coupling body 1, and the outer surface is coated with an anti-corrosion coating 4. The thickness of the anti-corrosion coating 4 is consistent with the height of the reinforcing ribs 12, which not only enhances the overall strength of the coupling but also improves its corrosion resistance. As shown in Figure 4, the distribution and structural characteristics of the reinforcing ribs 12 visually demonstrate their role in improving the overall performance of the coupling.

[0040] Finally, connecting flanges 13 are provided at both ends of the elastic sleeve 2, and the connecting flanges 13 are fixed to the end faces of the coupling body 1 by fastening bolts 14. A sealing gasket 15 is provided on the inner wall of the connecting flange 13. The sealing gasket 15 is made of silicone material, which has good elasticity and sealing performance, and can effectively prevent liquid from seeping into the coupling body 1 from the connecting flange 13. As shown in Figure 5, the specific installation method of the connecting flange 13, fastening bolts 14, and sealing gasket 15 is clearly visible. This design provides additional sealing protection for the coupling, further improving its operational reliability in complex environments.

[0041] Through the synergistic effect of the above structural design and material selection, this invention achieves comprehensive protection for the serpentine spring and key metal components. In practical applications, such as chemical plants or marine environments where couplings are exposed to high humidity or salt spray conditions for extended periods, this invention can significantly extend service life and improve operational stability.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A corrosion-proof serpentine spring coupling, characterized in that, The coupling includes a main body (1), a protective component, and a sealing component. The protective component is installed inside the main body (1), and the sealing component is installed on the outside of the main body (1). The protective component includes an elastic sleeve (2), a guide groove (3), an anti-corrosion coating (4), and a self-healing layer (5). The elastic sleeve (2) is fixedly connected to the inner wall of the main body (1) by bolts. Multiple guide grooves (3) are opened on the outer wall of the elastic sleeve (2), and the inner wall of the guide grooves (3) is coated with an anti-corrosion coating (4). The surface of the anti-corrosion coating (4) is covered with a self-healing layer (5); the sealing assembly includes a sealing ring (6), a clamping ring (7), an exhaust hole (8) and an isolation membrane (9). The sealing ring (6) is nested at both ends of the coupling body (1). A clamping ring (7) is provided on the outside of the sealing ring (6). The clamping ring (7) is fixedly connected to the end of the coupling body (1) through a threaded structure. An exhaust hole (8) is provided on the inner wall of the clamping ring (7). An isolation membrane (9) is provided at the outlet end of the exhaust hole (8).

2. The anti-corrosion serpentine spring coupling according to claim 1, wherein, The coupling body (1) has symmetrical positioning bosses at both ends. The outer wall of the positioning boss is provided with a slot. The inner wall of the sealing ring (6) is provided with a block corresponding to the slot. The block and the slot are connected by an interference fit.

3. The anti-corrosion serpentine spring coupling according to claim 1, wherein, The protective assembly also includes a conductive layer and an insulating gasket. The inner wall of the elastic sleeve (2) is coated with a conductive layer, and an insulating gasket is attached to the surface of the conductive layer. The insulating gasket is fixed to the inner wall of the elastic sleeve (2) by adhesive bonding.

4. The anti-corrosion serpentine spring coupling according to claim 1, wherein, An air inlet (10) is provided on one side of the coupling body (1), and a filter screen (11) is installed on the inner wall of the air inlet (10). The surface of the filter screen (11) is coated with a hydrophobic coating.

5. The anti-corrosion serpentine spring coupling according to claim 1, characterized in that, The outer wall of the coupling body (1) is symmetrically provided with reinforcing ribs (12), the inner side of the reinforcing ribs (12) is welded to the inner wall of the coupling body (1), and the outer side of the reinforcing ribs (12) is provided with an anti-corrosion coating (4).

6. The anti-corrosion serpentine spring coupling according to claim 1, characterized in that, The elastic sleeve (2) is provided with connecting flanges (13) at both ends. The outer wall of the connecting flange (13) is provided with threaded holes. Fastening bolts (14) are installed in the threaded holes. The end of the fastening bolts (14) passes through the connecting flange (13) and is fixedly connected to the end face of the coupling body (1).

7. A rust-resistant serpentine spring coupling according to claim 6, characterized in that, A sealing gasket (15) is provided on the inner wall of the connecting flange (13), and the sealing gasket (15) is made of silicone material.

8. The anti-corrosion serpentine spring coupling according to claim 1, characterized in that, The guide groove (3) is evenly distributed along the length of the elastic sheath (2).

9. The anti-corrosion serpentine spring coupling according to claim 1, wherein, The separator (9) is made of polytetrafluoroethylene.

10. The anti-corrosion serpentine spring coupling according to claim 3, wherein, The conductive layer is made of graphene material.

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