A power tube anti-corrosion connecting sleeve

Abstract

The utility model discloses a kind of electric power pipe anticorrosion connecting sleeve, belong to electric power engineering pipeline connection technical field.The sleeve includes multilayer anticorrosion structure (inner layer adhering layer, intermediate epoxy resin-glass fiber anticorrosion layer, outer layer PVDF wear-resistant anticorrosion layer), reinforced sealing structure ("U" type elastic sealing ring+annular sealing groove) and accurate positioning structure (annular positioning boss+guide inclined plane), also be equipped with end face polytetrafluoroethylene anticorrosion ring.Working, guide inclined plane guides electric power pipe and positioning boss to realize coaxial positioning, and elastic sealing ring is extruded to form double seal, multilayer anticorrosion structure is blocked from inside to outside Corrosion medium, end anticorrosion ring avoids interlayer gap corrosion.The utility model anticorrosion effect is good, sealing is reliable, installation is accurate, can prolong electric power pipeline service life, applicable to strong corrosion soil environment.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline connection components for power engineering, specifically to an anti-corrosion connection sleeve for power pipes (such as CPVC power pipes, MPP power pipes, etc.), which is particularly suitable for underground power pipeline laying scenarios with strong soil corrosivity. It can realize a sealed anti-corrosion connection between power pipes and extend the overall service life of the power pipeline. Background Technology

[0002] In power engineering, underground power lines require connecting sleeves to splice multiple sections of the conduit to meet the needs of long-distance cabling. Currently available power conduit connecting sleeves suffer from the following technical defects: Insufficient corrosion resistance: Traditional bushings are mostly made of single-layer polyethylene or polypropylene, relying solely on the corrosion resistance of the base material without a specially reinforced anti-corrosion structure. In corrosive soil environments such as saline-alkali land and industrial pollution areas, the outer wall of the bushing is easily corroded by chloride and sulfate ions in the soil, while the inner wall is prone to electrochemical corrosion due to moisture seeping into the gap between the power conduit and the bushing, leading to bushing cracking and leakage, which in turn affects the safety of power lines. Poor sealing reliability: Existing bushings mostly achieve sealing by interference fit between the inner wall of the bushing and the outer wall of the power pipe or by simply applying sealant. After long-term use, the sealant is prone to aging and failure. The interference fit is prone to gaps due to temperature changes (such as expansion at high temperatures in summer and contraction at low temperatures in winter), which allows rainwater and groundwater to seep into the bushing and aggravate the corrosion of the power pipe. Low installation positioning accuracy: Traditional bushings do not have a dedicated positioning structure. During installation, the coaxiality of the power pipe and the bushing needs to be manually calibrated, which can easily lead to problems such as power pipe misalignment and loose connection. This not only affects the sealing effect, but may also cause bushing damage due to uneven stress on the pipeline. The aforementioned defects result in a short service life (usually 3-5 years) for existing power pipe connection sleeves, requiring frequent excavation and maintenance, which increases the operation and maintenance costs of power projects. Furthermore, the maintenance process can easily affect surrounding traffic and the environment. Therefore, there is an urgent need for a connection sleeve with good corrosion resistance, reliable sealing, and precise installation positioning. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a corrosion-resistant connecting sleeve for power pipelines. Through the synergistic design of a multi-layered anti-corrosion structure, a reinforced sealing structure, and a precise positioning structure, it solves the problems of weak corrosion resistance, easy seal failure, and difficult installation and positioning of traditional sleeves, thereby extending the service life of power pipelines and reducing operation and maintenance costs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A corrosion-resistant connecting sleeve for power conduits includes a sleeve body, wherein the sleeve body is a hollow cylindrical structure open at both ends, characterized in that: Multi-layer anti-corrosion structure: The sleeve body is provided with an inner bonding layer, a middle anti-corrosion layer and an outer wear-resistant and anti-corrosion layer from the inside to the outside; Inner bonding layer: Made of modified polyethylene material, 1.2-2mm thick, with a smooth curved surface on the inner wall that fits the outer wall of the power pipe, ensuring a tight fit and reducing gaps; Intermediate anti-corrosion layer: A composite layer of epoxy resin-based anti-corrosion coating and glass fiber is used, with a thickness of 2-3mm. The glass fiber is distributed in a mesh in the epoxy resin-based coating to enhance the anti-corrosion performance and structural strength. Outer wear-resistant and corrosion-resistant layer: Made of polyvinylidene fluoride (PVDF) material, with a thickness of 1.5-2.5mm, it has the characteristics of wear resistance, acid and alkali resistance, and UV aging resistance, protecting the middle anti-corrosion layer from soil friction and corrosion. Enhanced sealing structure: The inner walls at both ends of the sleeve body are provided with annular sealing grooves, and elastic sealing rings are embedded in the sealing grooves; the elastic sealing rings are made of a composite material of nitrile rubber and polytetrafluoroethylene, with a "U" shaped cross section and the opening facing the outside of the sleeve. When the power pipe is inserted into the sleeve, the elastic sealing ring is squeezed and deformed, and its "U" shaped opening fits the outer wall of the power pipe and the inner wall of the sealing groove to form a double seal. Precise positioning structure: The inner wall of the sleeve body is provided with an annular positioning boss in the middle, and both sides of the positioning boss are provided with guide slopes (inclination angle 25-35°); the end of the power pipe is provided with an annular positioning groove that matches the positioning boss. When the power pipe is inserted into the sleeve, the guide slope guides the power pipe to accurately align, the positioning boss and the positioning groove engage, the depth of the positioning groove is the same as the height of the positioning boss, and the width is the same as the width of the positioning boss, so as to achieve coaxial positioning of the power pipe and the sleeve and avoid displacement. Supplementary anti-corrosion structure for end faces: Both ends of the sleeve body are covered with polytetrafluoroethylene anti-corrosion rings with a thickness of 0.8-1.2mm, which cover the interlayer gaps of the sleeve end faces to prevent corrosive media from seeping into the sleeve from the end faces. The corrosion-resistant connecting sleeve of this utility model achieves corrosion resistance and stable connection through the synergistic effect of "multi-layer protection + sealing and blocking + precise positioning". The specific working process is as follows: (1) Installation stage: positioning and sealing pre-implementation Pre-treatment: Clean the oil and impurities from the end of the power conduit, ensuring that the positioning groove is undamaged; embed the elastic sealing ring into the sealing groove at both ends of the sleeve, ensuring that the sealing ring fits snugly against the inner wall of the groove; Guided insertion: Align the end of the power pipe with the guide ramp at one end of the bushing, and slowly insert the bushing along the guide ramp; the guide ramp reduces the insertion resistance through its inclined structure, and at the same time guides the axis of the power pipe to be consistent with the axis of the bushing. Precise positioning: When the positioning groove at the end of the power pipe is inserted into the positioning boss on the inner wall of the sleeve, the insertion action stops. At this time, the power pipe and the sleeve are coaxially positioned, and the end of the power pipe is in close contact with the positioning boss, avoiding over-insertion that could damage the sealing ring. Sealing and molding: During the insertion of the power pipe, its outer wall squeezes the "U"-shaped opening of the elastic sealing ring, causing the sealing ring to deform elastically. The deformed sealing ring is in close contact with both the outer wall of the power pipe and the inner wall of the sealing groove, forming a double sealing structure of "pipe-ring-groove" to prevent external moisture and soil particles from entering the casing. (2) Use stage: Multi-layer anti-corrosion synergistic protection Outer protection: The outer PVDF wear-resistant and corrosion-resistant layer is in direct contact with the soil. Its wear-resistant properties can resist the frictional damage of soil particles to the casing, and its acid and alkali resistance can block the penetration of corrosive media such as chloride ions and sulfate ions in the soil. Intermediate protection: If the outer layer is slightly damaged, the intermediate epoxy resin-glass fiber composite anti-corrosion layer can further block the corrosive medium. The mesh-distributed glass fiber not only enhances the crack resistance of the anti-corrosion layer, but also forms a "physical barrier" to delay the penetration of the corrosive medium inward. Inner protection: The inner modified polyethylene bonding layer is tightly bonded to the outer wall of the power pipe without obvious gaps, which can prevent moisture from accumulating in the gaps and causing electrochemical corrosion; at the same time, the modified polyethylene has a certain degree of flexibility, which can adapt to the thermal expansion and contraction of the pipeline caused by temperature changes and prevent the bonding layer from cracking. End face protection: The PTFE anti-corrosion rings at both ends cover the interlayer gaps of the sleeve end face to prevent corrosive media from penetrating from the interlayer interface of the end face, further improving the anti-corrosion system. Beneficial effects

[0005] Significantly enhanced corrosion resistance: The multi-layered anti-corrosion structure forms a triple protection from the inside out, consisting of "closed barrier - enhanced corrosion resistance - wear-resistant protection", which can adapt to highly corrosive environments such as saline-alkali land and industrial pollution areas, extending the service life of the casing to 10-15 years. High sealing reliability: The "U"-shaped elastic sealing ring and the sealing groove cooperate to form a double seal, and the sealing ring is made of aging-resistant composite material, which is not easy to fail after long-term use, and the sealing life matches the life of the sleeve body. Easy and precise installation: The combination of the guide ramp and the positioning boss enables coaxial positioning of the power pipe and the sleeve without the need for professional equipment, improving installation efficiency by 30% and avoiding sealing failure caused by manual calibration errors. High structural stability: The glass fiber reinforced structure of the middle anti-corrosion layer and the outer PVDF material work together to improve the overall strength of the casing, which can resist deformation caused by underground soil pressure and ensure connection stability. Attached Figure Description

[0006] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the sleeve body of this utility model; Figure 3 This is a schematic diagram of the power pipe structure of this utility model; Figure 4 This is a schematic diagram of the layered structure of this utility model; In the picture: 1-Casing body, 2-Inner bonding layer, 3-Intermediate anti-corrosion layer, 4-Outer wear-resistant and anti-corrosion layer, 5-Sealing groove, 6-Elastic sealing ring, 7-Positioning boss, 8-Guide slope, 9-Anti-corrosion ring, 10-Power pipe, 11-Positioning groove. Detailed Implementation

[0007] 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.

[0008] like Figure 1-4 As shown; A corrosion-resistant connecting sleeve for power pipes.

[0009] In this implementation plan: to solve the technical problems existing in the prior art, such as the technical defects of the power pipe connection bushings currently on the market as disclosed in the background art above: Insufficient corrosion resistance: Traditional bushings are mostly made of single-layer polyethylene or polypropylene, relying solely on the corrosion resistance of the base material without a specially reinforced anti-corrosion structure. In corrosive soil environments such as saline-alkali land and industrial pollution areas, the outer wall of the bushing is easily corroded by chloride and sulfate ions in the soil, while the inner wall is prone to electrochemical corrosion due to moisture seeping into the gap between the power conduit and the bushing, leading to bushing cracking and leakage, which in turn affects the safety of power lines. Poor sealing reliability: Existing bushings mostly achieve sealing by interference fit between the inner wall of the bushing and the outer wall of the power pipe or by simply applying sealant. After long-term use, the sealant is prone to aging and failure. The interference fit is prone to gaps due to temperature changes (such as expansion at high temperatures in summer and contraction at low temperatures in winter), which allows rainwater and groundwater to seep into the bushing and aggravate the corrosion of the power pipe. Low installation positioning accuracy: Traditional bushings do not have a dedicated positioning structure. During installation, the coaxiality of the power pipe and the bushing needs to be manually calibrated, which can easily lead to problems such as power pipe misalignment and loose connection. This not only affects the sealing effect, but may also cause bushing damage due to uneven stress on the pipeline. The aforementioned defects result in a short service life (usually 3-5 years) for existing power pipe connection sleeves, requiring frequent excavation and maintenance, increasing the operation and maintenance costs of power projects, and the maintenance process can easily affect surrounding traffic and the environment. In terms of practical use, this problem is obviously a real and difficult problem to solve. Therefore, in order to solve this technical problem, a corrosion-resistant connection sleeve for power pipes is provided. Example

[0010] like Figure 1-4 As shown in the figure; A corrosion-resistant connecting sleeve suitable for DN160 CPVC power conduit, with the following specific structural parameters: Sleeve body 1: Overall length 300mm, inner diameter 162mm (compatible with DN160 power conduit outer diameter 160mm), outer diameter 175mm; Multi-layer anti-corrosion structure: Inner bonding layer 2: Modified polyethylene material, 1.5mm thick, inner wall roughness Ra≤0.8μm; Intermediate anti-corrosion layer 3: Epoxy resin-based anti-corrosion coating (solid content ≥95%) is combined with glass fiber (diameter 10μm, mesh density 20 mesh), with a thickness of 2.5mm, and is bonded to the inner bonding layer by a winding molding process; Outer wear-resistant and corrosion-resistant layer 4: PVDF material, 2mm thick, combined with the intermediate corrosion-resistant layer through extrusion coating process; Enhanced sealing structure: Sealing groove 5: Located on the inner wall of both ends of the sleeve, 20mm from the end face, with a groove depth of 3mm and a groove width of 5mm; Elastic sealing ring 6: It is a composite of nitrile rubber (hardness 60±5 Shore A) and polytetrafluoroethylene (thickness 0.2 mm, covering the outside of nitrile rubber), with a "U" shaped cross section, an opening width of 4 mm, and a height of 5 mm. Precise positioning structure: Positioning boss 7: Located in the middle of the inner wall of the sleeve, with a height of 1mm and a width of 2mm; Guide ramp 8: Located on both sides of the positioning boss, with an inclination angle of 30° and a ramp length of 5mm; Positioning groove 11 of power conduit 10: located at the end, 140mm from the end face (corresponding to half the length of the sleeve), with a groove depth of 1mm and a groove width of 2mm; End-face anti-corrosion supplementary structure: Anti-corrosion ring 9 is made of polytetrafluoroethylene, with a thickness of 1mm, an outer diameter of 175mm (consistent with the outer diameter of the sleeve), and an inner diameter of 162mm (consistent with the inner diameter of the sleeve). It is attached to both end faces of the sleeve with epoxy resin adhesive. The depth of the positioning groove 11 is the same as the height of the positioning boss 7, and the width is the same as the width of the positioning boss 7.

[0011] Installation steps Cleaning: Wipe the ends of the power conduit 10 (length ≥ 150 mm) and the inner wall and sealing groove 5 of the sleeve body 1 with a cotton cloth to remove oil and dust; Install sealing ring: Embed the elastic sealing ring 6 into the sealing groove 5 at both ends of the sleeve, ensuring that the "U"-shaped opening of the sealing ring faces the outside of the sleeve and that there is no gap between the sealing ring and the inner wall of the groove; Insertion: Align the end of the power pipe 10 with the guide slope 8 at one end of the sleeve, and slowly push it into the sleeve until the positioning groove 11 of the power pipe engages with the positioning boss 7 of the sleeve. At this time, the end of the power pipe is in close contact with the positioning boss, and the insertion depth is 150mm (half the length of the sleeve). Inspection: Shake the power conduit by hand to confirm that there is no obvious looseness; apply soapy water to the outside of both ends of the conduit and observe whether bubbles are generated (if no bubbles are generated, the seal is qualified). Fixing: To enhance stability, wrap 2-3 turns of fiberglass tape around the middle of the outer side of the sleeve and apply epoxy resin adhesive. After the adhesive has cured, the installation is complete. Performance testing The performance of the connecting sleeve in this embodiment was tested, and the results are as follows: Corrosion resistance: After immersion in 5% sodium chloride solution for 1000 hours, there are no corrosion spots on the outer wall of the casing and no rust on the inner wall; Sealing performance: No leakage after holding under 0.1MPa water pressure for 24 hours; Aging resistance: After 1000h of UV aging test, the elastic recovery rate of the sealing ring is ≥90%, and the anti-corrosion layer shows no cracking or peeling. Compressive strength: Under soil pressure of 200kN / m², the casing deformation is ≤3% and there is no cracking.

[0012] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A corrosion-resistant connecting sleeve for power pipes, comprising a sleeve body (1), wherein the sleeve body (1) is a hollow cylindrical structure open at both ends, characterized in that: The sleeve body (1) is provided with an inner bonding layer (2), a middle anti-corrosion layer (3) and an outer wear-resistant and anti-corrosion layer (4) from the inside to the outside. The inner walls at both ends of the sleeve body (1) are provided with annular sealing grooves (5), and elastic sealing rings (6) are embedded in the sealing grooves (5). The inner wall of the sleeve body (1) is provided with an annular positioning boss (7), and both sides of the positioning boss (7) are provided with guide slopes (8). Both ends of the sleeve body (1) are covered with polytetrafluoroethylene anti-corrosion rings (9).

2. The anti-corrosion connecting sleeve for power pipes according to claim 1, characterized in that: The inner bonding layer (2) is made of modified polyethylene material with a thickness of 1.2-2mm, and the inner wall is a smooth curved surface that is compatible with the outer wall of the power pipe (10).

3. The anti-corrosion connecting sleeve for power pipes according to claim 1, characterized in that: The intermediate anti-corrosion layer (3) is a composite layer of epoxy resin-based anti-corrosion coating and glass fiber, with a thickness of 2-3 mm. The glass fiber is distributed in a mesh pattern in the epoxy resin-based coating.

4. The anti-corrosion connecting sleeve for power pipes according to claim 1, characterized in that: The outer wear-resistant and corrosion-resistant layer (4) is made of polyvinylidene fluoride and has a thickness of 1.5-2.5mm.

5. The anti-corrosion connecting sleeve for power pipes according to claim 1, characterized in that: The elastic sealing ring (6) is made of a composite material of nitrile rubber and polytetrafluoroethylene, with a "U" shaped cross section and the opening facing the outside of the sleeve body (1).

6. The anti-corrosion connecting sleeve for power pipes according to claim 1, characterized in that: The guide slope (8) has an inclination angle of 25-35°, and the positioning boss (7) has a height of 1mm and a width of 2mm.

7. The anti-corrosion connecting sleeve for power pipes according to claim 1, characterized in that: The thickness of the polytetrafluoroethylene anti-corrosion ring (9) is 0.8-1.2 mm, the outer diameter is consistent with the outer diameter of the sleeve body (1), and the inner diameter is consistent with the inner diameter of the sleeve body (1).

8. The anti-corrosion connecting sleeve for power pipes according to claim 1, characterized in that: The end of the power pipe (10) is provided with an annular positioning groove (11) that is adapted to the positioning boss (7). The depth of the positioning groove (11) is the same as the height of the positioning boss (7), and the width is the same as the width of the positioning boss (7).

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