Replaceable power cable protection tube

Abstract

The application discloses a replaceable power cable protection pipe, which comprises a pipe body, the pipe body comprises an upper half pipe, a lower half pipe and two inner half pipes, an elastic supporting mechanism is arranged between the upper half pipe and the lower half pipe and the corresponding inner half pipe, and the two inner half pipes can be enclosed to form an inner pipe for the power cable to pass through; the upper half pipe is provided with a clamping groove, the lower half pipe is provided with a buckle matched with the clamping groove, the upper half pipe is provided with an upper half flange, the lower half pipe is provided with a lower half flange, one side of the upper half flange away from the pipe body is provided with an upper sealing element, both sides of the upper half pipe are provided with side sealing elements connected with the upper sealing element, the side sealing elements are located on one side of the buckle, one side of the lower half flange away from the pipe body is provided with a lower sealing element, the upper sealing element, the side sealing elements and the lower sealing element are all filled with gas, and the upper sealing element and the side sealing elements can flow gas to each other.

Description

Technical Field

[0001] This application relates to the technical field of cable conduits, and in particular to a replaceable power cable protection conduit. Background Technology

[0002] Cables are widely used in power transmission and communication, and cable protection pipes, as crucial components ensuring the safe operation of cables, have also undergone continuous development. With the acceleration of urban construction and the improvement of various infrastructures, the demand for cable protection pipes is increasing daily. Good cable protection pipes can effectively prevent cables from being damaged by external environmental factors, such as mechanical damage and chemical corrosion, extending the service life of cables and ensuring the stable transmission of power and communication, playing a vital role in energy supply and information transmission.

[0003] Most existing cable protection pipes are integrated units, installed by inserting a single cable or multiple cables through one end of the pipe. Multiple pipes are then fixed together via end threads or welding. Replacing a pipe requires complete cutting and removal of the entire pipe system, resulting in significant workload. While split-type protection pipes improve ease of installation and maintenance, they are prone to issues with overall support and connection strength, impacting the efficiency and quality of cable laying and maintenance. Summary of the Invention

[0004] The purpose of this application is to provide a replaceable power cable protection pipe to solve the problems that easily exist in the overall support and connection firmness of split protection pipes.

[0005] The replaceable power cable protection pipe provided in this application adopts the following technical solution: A replaceable power cable protection pipe includes a pipe body comprising an upper half pipe, a lower half pipe, and two inner half pipes. An elastic support mechanism is provided between the upper half pipe, the lower half pipe, and the corresponding inner half pipe. The two inner half pipes can be arranged to form an inner pipe for cable passage. The upper half pipe is provided with a groove, and the lower half pipe is provided with a snap fastener that mates with the groove. The upper half pipe has an upper flange, and the lower half pipe has a lower flange. An upper sealing element is provided on the side of the upper flange facing away from the pipe body. Side sealing elements connected to the upper sealing element are provided on both sides of the upper half pipe, with the side sealing elements located on one side of the snap fastener. A lower sealing element is provided on the side of the lower flange facing away from the pipe body. The upper sealing element, the side sealing element, and the lower sealing element are all filled with gas, and gas flow is allowed between the upper sealing element and the side sealing element.

[0006] By adopting the above technical solution, two inner tubes are formed to form an inner tube through which the cable passes. The cooperation of the buckle and the slot enables the quick assembly of the split upper and lower tubes. The elastic support mechanism can support the tube body and the inner tube with elastic support. When the outer tube is hit by external force and bends, it can continuously support the outer tube and reduce the direct action of external force on the cable under the protection of the inner tube.

[0007] The upper and lower flanges on the same side can form a flange plate, which is fixed to the pipe body by bolts. Simultaneously, the upper seal is compressed, causing internal gas to flow towards the side seal. The side seal expands to press against the snap-fit ​​side, making it difficult for the snap-fit ​​to disengage from the groove, thus improving the robustness and sealing of the assembly between the upper and lower pipe halves. The flange bolt fixing and the fit between the groove and the snap-fit ​​improve the ease of replacement.

[0008] Optionally, the elastic support mechanism includes an elastic support arm and a telescopic assembly disposed on the outer side of the inner half-tube, one end of the telescopic assembly being connected to the outer side of the inner half-tube and the other end being connected to the elastic support arm.

[0009] By adopting the above technical solution, the elastic support arm has the effects of elastic deformation and elastic recovery. When the outer tube is impacted by external force and bent, it can continuously support the outer tube. In addition, the telescopic component can support the elastic support arm and avoid damage caused by excessive deformation.

[0010] Optionally, the elastic support arm is arranged in a "V" shape, with both ends connected to the outer wall of the inner half-tube and the middle part connected to the inner wall of the upper half-tube or the lower half-tube.

[0011] By adopting the above technical solution, the "V"-shaped setting can facilitate the elastic deformation and elastic recovery of the elastic support arm.

[0012] Optionally, the telescopic assembly includes an air storage pipe disposed in the inner half-tube and a piston rod slidably disposed in the air storage pipe. The air storage pipe is provided with an air storage groove that cooperates with the piston rod. One end of the piston rod is connected to the elastic support arm. The air storage groove (52) corresponding to the upper half-tube (1) is connected to the side seal (15) through a connecting air pipe. By adopting the above technical solution, when the outer tube is impacted by external force and bent, the elastic support arm deforms in the direction closer to the inner tube, pushing the piston rod to move into the gas storage tank, pushing the gas towards the side seal, causing the side seal to expand further, and further improving the firmness and sealing of the assembly between the upper and lower tubes.

[0013] Optionally, the upper tube has upper extensions on both sides, the lower tube has lower extensions on both sides, the buckle is located on the lower extension, and the slot and the side seal are located on the upper extension.

[0014] By adopting the above technical solution, the cooperation between the buckle and the slot, along with the side seal, improves the firmness and sealing of the connection between the upper extension and the lower extension.

[0015] Optionally, the upper extension is provided with a top block and a reset member that drives the top block to slide back to its original position, and the side of the buckle opposite to the side seal abuts against the top block.

[0016] By adopting the above technical solution, when the side seal expands and abuts against the snap-fit ​​side, the reset component is under stress and elastically deformed, maintaining a tendency to elastically reset. When replacement is required, the gas inside the side seal flows out, the force decreases, and the elastic reset of the reset component drives the top block to push the snap-fit ​​to deform, facilitating the snap-fit's disengagement from the slot.

[0017] Optionally, the lower extension is provided with a groove that mates with the side seal.

[0018] By adopting the above technical solution, when the side seal expands, it can be partially embedded in the groove, which improves the stability of the side seal and increases the gap distance between the side seal and the lower extension, thereby improving the sealing performance.

[0019] Optionally, the upper flange is provided with an upper connecting groove for the upper seal to be embedded, and the lower flange is provided with a lower connecting groove for the lower seal to be embedded. The groove walls of both the upper and lower connecting grooves are provided with multiple grooves.

[0020] By adopting the above technical solution, when the flange is fixed, the upper and lower sealing parts can be embedded in the groove, improving stability and sealing performance.

[0021] Optionally, the inner half-tube is provided with a positioning block and a positioning groove, wherein the positioning block can cooperate with the corresponding positioning groove.

[0022] By adopting the above technical solution, the cooperation between the positioning block and the positioning groove improves the stability of the cooperation between the two inner half tubes.

[0023] Optionally, the upper extension is provided with a guide groove, and the lower extension is provided with a guide block that mates with the guide groove.

[0024] By adopting the above technical solution, the cooperation between the guide block and the guide groove improves the stability of the cooperation between the upper extension and the lower extension, and reduces the occurrence of radial slippage.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Two inner tubes form an inner tube through which the cable passes. The cooperation of the buckle and the slot enables the quick assembly of the split upper and lower tubes. The elastic support mechanism can support the tube body and the inner tube with elastic support. When the outer tube is hit by external force and bends, it can continuously support the outer tube and reduce the direct action of external force on the cable under the protection of the inner tube. 2. The upper and lower flanges on the same side can form a flange plate, which is fixed to the pipe body by bolts. Simultaneously, the upper seal is compressed, causing internal gas to flow towards the side seal. The side seal expands to press against the snap-fit ​​side, making it difficult for the snap-fit ​​to disengage from the groove, thus improving the robustness and sealing of the assembly between the upper and lower pipe halves. The flange bolt fixing and the fit between the groove and the snap-fit ​​improve the ease of replacement. 3. When the outer tube is impacted by external force and bent, the elastic support arm deforms in the direction closer to the inner tube, pushing the piston rod to move into the gas storage tank, pushing the gas towards the side seal, causing the side seal to expand further, and further improving the firmness and sealing of the assembly between the upper and lower tubes. 4. When the side seal expands and abuts against the snap-fit ​​side, the reset component is under stress and elastically deformed, maintaining a tendency to elastically reset. When replacement is required, the gas inside the side seal flows out, the force decreases, and the elastic reset of the reset component drives the top block to push the snap-fit ​​to deform, facilitating the snap-fit's disengagement from the slot. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 2 of this application; Figure 2 This is a schematic diagram of the elastic support arm of Embodiment 2 of this application; Figure 3 This is a schematic diagram of the upper half of the tube in Embodiment 2 of this application; Figure 4 This is a schematic diagram of the lower half of the tube in Embodiment 2 of this application; Figure 5 This is a schematic diagram of the groove structure in Embodiment 2 of this application.

[0027] Explanation of reference numerals in the attached drawings: 1. Upper half-pipe; 11. Upper extension; 12. Slot; 13. Upper flange; 131. Upper connecting groove; 132. Groove; 14. Upper seal; 15. Side seal; 16. Top block; 17. Reset piece; 18. Guide groove; 2. Lower half-pipe; 21. Lower extension; 22. Snap-fit; 23. Lower flange; 231. Lower connecting groove; 24. Lower seal; 25. Embedded groove; 26. Guide block; 3. Inner half-pipe; 31. Positioning block; 32. Positioning groove; 4. Elastic support arm; 5. Gas storage pipe; 51. Piston rod; 52. Gas storage tank. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail.

[0029] Embodiment 1 of this application discloses a power cable.

[0030] A power cable includes a single power conductor core, which, from the inside out, comprises a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a semi-conductive buffer water-blocking tape layer, a corrugated metal waterproof sheath, an anti-corrosion coating, an inner lining layer, an armor layer, and an outer sheath. The conductor shielding layer, insulation layer, and insulation shielding layer all use low-by-product cross-linked polyethylene insulation material. The amount of dicumyl peroxide, a cross-linking agent, added to the low-by-product cross-linked polyethylene insulation material is reduced by 15%–20% compared to conventional formulations, and it is also compounded with a cross-linking aid. The dielectric loss tangent of the insulation layer is ≤0.0008 at 90℃, the residual amount of cross-linking by-product gas is ≤30ppm, and the degassing treatment time of the insulation layer is ≤6 days. The conductor has a nominal cross-sectional area of ​​800 mm² and adopts a layered, tightly stranded copper conductor structure, consisting of 5 layers. From the inside out, the number of single filaments in each layer is 6, 12, 18, 24, and 30 respectively, with the stranding direction alternating layer by layer. The conductor compaction coefficient is ≥0.92, and the conductor DC resistance at 20℃ is ≤0.0221 Ω / km. The nominal thickness of the insulation layer is 17.5 mm, and the insulation eccentricity is ≤1.5%. The conductor shielding layer, the insulation layer, and the insulation shielding layer are co-extruded in one step using a catenary continuous extrusion crosslinking production line. The crosslinking temperature is controlled between 340℃ and 370℃, and the crosslinking pressure is controlled between 1.0 and 1.5 MPa. The crosslinking byproducts of the low-byproduct crosslinked polyethylene insulation material are cumyl alcohol, α-methylstyrene, and acetophenone, with a residual amount of crosslinking byproduct gases ≤30 ppm. The degassing process employs a two-stage gradient degassing device. The first stage degassing temperature is 85℃, and the treatment time is 3 days. The second stage degassing temperature is 70℃, and the treatment time is 3 days, for a total degassing time of 6 days. The corrugated metal waterproof sheath is a corrugated aluminum sheath, manufactured using a longitudinal wrapping welding process, with a weld defect rate of <0.01%. The nominal thickness of the corrugated aluminum sheath is 1.5mm, and the corrugation depth is 3.0–4.0mm. The armor layer is a double-layer reverse-stranded galvanized steel wire armor layer, with the inner and outer steel wires twisted in opposite directions. The nominal thickness of the inner lining is 3.0mm, and the nominal thickness of the outer sheath is 4.5mm. The outer sheath is a semi-conductive polyethylene sheath, with a graphite conductive coating on its surface. The conductor has water-absorbing and swelling water-blocking yarn embedded between its layers and coated with semi-conductive water-resistant adhesive. The nominal thickness of the semi-conductive buffer water-blocking tape layer is 2.5mm. The anti-corrosion coating is an asphalt anti-corrosion coating with a nominal thickness of 0.3mm. The conductor has a water permeability length ≤0.5m after 24 hours under 2.0MPa water pressure. The continuous production length of a single cable is ≥20km.

[0031] Embodiment 2 of this application discloses a replaceable power cable protection pipe.

[0032] Reference Figure 1 , Figure 2 A replaceable power cable protection pipe includes a pipe body comprising an upper half-pipe 1, a lower half-pipe 2, and two inner half-pipes 3. An elastic support mechanism is provided between the upper half-pipe 1 and the lower half-pipe 2 and their corresponding inner half-pipes 3. The two inner half-pipes 3 can be enclosed to form an inner pipe for the cable to pass through. Upper extensions 11 are provided on both sides of the upper half-pipe 1, and lower extensions 21 are provided on both sides of the lower half-pipe 2. The upper extensions 11 have slots 12, and the lower extensions 21 are integrally formed with buckles 22 that mate with the slots 12.

[0033] Reference Figure 3 , Figure 4 Both ends of the upper pipe 1 are integrally formed with upper flanges 13, and both ends of the lower pipe 2 are integrally formed with lower flanges 23. An upper sealing element 14 is embedded on the side of the upper flange 13 away from the pipe body. Side sealing elements 15 connected to the upper sealing element 14 are connected to both sides of the upper pipe 1. The side sealing elements 15 are located on one side of the snap fastener 22. A lower sealing element 24 is embedded on the side of the lower flange 23 away from the pipe body. The upper sealing element 14, the side sealing element 15, and the lower sealing element 24 are all hollow elastic sealing gaskets, and their hollow interiors are filled with gas. The upper sealing element 14 and the side sealing element 15 are integral and can allow gas to flow between them.

[0034] Reference Figure 5 The lower extension 21 has a groove 25 that mates with the side seal 15. The upper flange 13 has an upper connecting groove 131 for the upper seal 14 to be inserted. The lower flange 23 has a lower connecting groove 231 for the lower seal 24 to be inserted. The groove walls of the upper connecting groove 131 and the lower connecting groove 231 are provided with multiple grooves 132.

[0035] Reference Figure 3 , Figure 4 The elastic support mechanism includes an elastic support arm 4 disposed on the outside of the inner half-tube 3 and a telescopic assembly. One end of the telescopic assembly is fixedly connected to the outside of the inner half-tube 3, and the other end is fixedly connected to the elastic support arm 4. The elastic support arm 4 is arranged in a "V" shape, with both ends fixedly connected to the outer wall of the inner half-tube 3 and the middle part fixedly connected to the inner wall of the upper half-tube 1 or the lower half-tube 2.

[0036] Reference Figure 3 , Figure 4The telescopic assembly includes an air storage pipe 5 fixedly connected to the outer wall of the inner half-pipe 3, and a piston rod 51 slidably connected to the air storage pipe 5. The air storage pipe 5 has an air storage groove 52 that cooperates with the piston rod 51. One end of the piston rod 51 is fixedly connected to the elastic support arm 4. The air storage groove 52 corresponding to the upper half-pipe 1 is connected to the side seal 15 through a connecting air pipe, allowing gas to flow between the air storage groove 52 and the side seal 15. The air storage groove 52 corresponding to the lower half-pipe 2 is not connected to the side seal 15.

[0037] Reference Figure 3 , Figure 4 The upper extension 11 is movably connected to a top block 16 and a reset member 17 that drives the top block 16 to reset and slide. The reset member 17 is a metal spring sheet arranged in a "V" shape. The side of the buckle 22 away from the side seal 15 abuts against the top block 16.

[0038] Reference Figure 3 , Figure 4 The inner half-tube 3 has a positioning block 31 and a positioning groove 32 integrally formed on both sides. The positioning block 31 on one inner half-tube 3 can be inserted and engaged with the positioning groove 32 of the other inner half-tube 3. The upper extension 11 has a guide groove 18 integrally formed, and the lower extension 21 has a guide block 26 integrally formed for the guide groove 18 to be inserted and engaged.

[0039] The implementation principle of a replaceable power cable protection pipe in Embodiment 2 of this application is as follows: Two inner tubes 3 form an inner tube through which the cable passes. The cooperation between the buckle 22 and the slot 12 enables the quick assembly of the split upper tube 1 and lower tube 2. The elastic support mechanism can provide elastic support between the tube body and the inner tube. When the outer tube is impacted by external force and bent, it can continuously support the outer tube and reduce the direct action of external force on the cable under the protection of the inner tube.

[0040] The upper flange 13 and lower flange 23 on the same side can form a flange, which is fixed to the pipe body by bolts. At the same time, the upper seal 14 is compressed, causing the internal gas to flow to the side seal 15. The side seal 15 expands to press against one side of the snap fastener 22, making it difficult for the snap fastener 22 to disengage from the groove 12, thus improving the firmness and sealing of the assembly between the upper pipe 1 and the lower pipe 2. The flange bolt fixing and the cooperation between the groove 12 and the snap fastener 22 improve the convenience of replacement.

[0041] When the outer tube is impacted or bent by external force, the elastic support arm 4 deforms in the direction closest to the inner tube, pushing the piston rod 51 to move into the gas storage tank 52, pushing the gas towards the side seal 15, causing the side seal 15 to expand further, and further improving the firmness and sealing of the assembly between the upper half tube 1 and the lower half tube 2.

[0042] When the side seal 15 expands and abuts against one side of the snap fastener 22, the reset member 17 is under stress and elastically deformed, and maintains the tendency to elastically reset. When replacement is required, the gas in the side seal 15 flows out, the force decreases, and the reset member 17 elastically resets, causing the top block 16 to push the snap fastener 22 to deform, making it easier for the snap fastener 22 to disengage from the slot 12.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A replaceable power cable protection pipe, characterized in that: The device includes a pipe body comprising an upper pipe (1), a lower pipe (2), and two inner pipes (3). An elastic support mechanism is provided between the upper pipe (1) and the lower pipe (2) and the corresponding inner pipes (3). The two inner pipes (3) can form an inner pipe through which a cable passes. The upper pipe (1) is provided with a slot (12), and the lower pipe (2) is provided with a buckle (22) that mates with the slot (12). The upper pipe (1) is provided with an upper flange (13), and the lower pipe (2) is provided with a lower flange (23). An upper seal (14) is provided on the side of the flange (13) away from the pipe body. Side seals (15) connected to the upper seal (14) are provided on both sides of the upper half pipe (1). The side seals (15) are located on one side of the buckle (22). A lower seal (24) is provided on the side of the lower half flange (23) away from the pipe body. The upper seal (14), the side seals (15) and the lower seals (24) are all filled with gas. The upper seal (14) and the side seals (15) can exchange gas flow.

2. The replaceable power cable protection pipe according to claim 1, characterized in that: The elastic support mechanism includes an elastic support arm (4) disposed on the outside of the inner half tube (3) and a telescopic component. One end of the telescopic component is connected to the outside of the inner half tube (3), and the other end is connected to the elastic support arm (4).

3. The replaceable power cable protection pipe according to claim 2, characterized in that: The elastic support arm (4) is arranged in a "V" shape. The two ends of the elastic support arm (4) are connected to the outer wall of the inner half tube (3), and the middle part is connected to the inner wall of the upper half tube (1) or the lower half tube (2).

4. The replaceable power cable protection pipe according to claim 3, characterized in that: The telescopic assembly includes an air storage pipe (5) disposed in the inner half-tube (3) and a piston rod (51) slidably disposed in the air storage pipe (5). The air storage pipe (5) is provided with an air storage groove (52) that cooperates with the piston rod (51). One end of the piston rod (51) is connected to the elastic support arm (4). The air storage groove (52) corresponding to the upper half-tube (1) is connected to the side seal (15) through a connecting air pipe.

5. The replaceable power cable protection pipe according to claim 1, characterized in that: The upper tube (1) has an upper extension (11) on both sides, the lower tube (2) has a lower extension (21) on both sides, the buckle (22) is located on the lower extension (21), and the slot (12) and the side seal (15) are located on the upper extension (11).

6. The replaceable power cable protection pipe according to claim 5, characterized in that: The upper extension (11) is provided with a top block (16) and a reset member (17) that drives the top block (16) to reset and slide. The buckle (22) abuts against the top block (16) on the side away from the side seal (15).

7. The replaceable power cable protection pipe according to claim 5, characterized in that: The lower extension (21) is provided with a groove (25) that mates with the side seal (15).

8. The replaceable power cable protection pipe according to claim 1, characterized in that: The upper flange (13) is provided with an upper connecting groove (131) for the upper sealing element (14) to be inserted, and the lower flange (23) is provided with a lower connecting groove (231) for the lower sealing element (24) to be inserted. The groove walls of the upper connecting groove (131) and the lower connecting groove (231) are provided with multiple grooves (132).

9. The replaceable power cable protection pipe according to claim 1, characterized in that: The inner half-tube (3) is provided with a positioning block (31) and a positioning groove (32), and the positioning block (31) can cooperate with the corresponding positioning groove (32).

10. The replaceable power cable protection pipe according to claim 1, characterized in that: The upper extension (11) is provided with a guide groove (18), and the lower extension (21) is provided with a guide block (26) for engaging with the guide groove (18).

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