Bending-resistant CPVC (chlorinated polyvinyl chloride) cable protection pipe

Abstract

The utility model discloses an anti-bending CPVC cable protection pipe, which relates to the technical field of cable protection pipes and comprises a protection pipe body, one end of the protection pipe body is provided with an installation groove, the inner wall of the installation groove is provided with an elastic assembly, the inner wall of the protection pipe body is fixedly connected with a butt joint pipe, and the butt joint pipe is provided with a clamping groove. A positioning assembly is arranged at one end of the butt joint pipe and comprises an internal thread sealing cylinder in threaded butt joint with the butt joint pipe. According to the utility model, through the threaded connection of the positioning assembly and the conical extrusion structure, the adjustable fastening of the cable is realized: the internal thread sealing cylinder is in threaded fit with the butt joint pipe, the clamping force of the limiting cylinder to the cable can be dynamically adjusted through the screwing degree, and the fixing requirements of cables with different diameters are met; through the conical extrusion design of the built-in limiting conical cylinder and the limiting cylinder, the limiting cylinder is forced to elastically contract through the compensation groove during screwing and is tightly attached to the outer wall of the cable to form mechanical clamping force, fixation is reliable, additional tools are not needed, and the installation efficiency is improved by more than 40%.

Description

Technical Field

[0001] This utility model relates to the field of cable protection pipe technology, specifically to a bending-resistant CPVC cable protection pipe. Background Technology

[0002] Currently, CPVC (chlorinated polyvinyl chloride) cable protection pipes are widely used in cable laying projects in urban power grids, building electrical systems, and rail transportation due to their advantages such as corrosion resistance, good insulation, and moderate cost. However, in practical use, traditional CPVC cable protection pipes have the following technical problems that urgently need to be solved:

[0003] I. Insufficient bending resistance

[0004] Existing CPVC pipes are mostly single-layer structures or simple composite layer designs, which only increase the wall thickness to improve bending resistance. This results in heavy pipes and high costs. Furthermore, under frequent bending or dynamic loads (such as vehicle traffic or foundation settlement), the pipe walls are prone to cracking or permanent deformation due to stress concentration, affecting the reliability of cable protection. For example, in drop hammer impact tests (test conditions: hammer weight 1kg, drop height 1.5m), the breakage rate of traditional pipes exceeds 20%, which cannot meet the requirements of high reliability scenarios.

[0005] II. Defects in Cable Fixing and Connection Methods

[0006] Rigid connections lead to stress transmission: Traditional pipes are mostly bonded with glue or hot-melt welding, forming a rigid whole after connection. When the external environment deforms (such as foundation settlement), stress is easily transmitted to the cable through the connection, causing wear on the cable sheath or even breakage of the internal core wire.

[0007] Inconvenient installation and adjustment: For scenarios where the cable position needs to be adjusted later (such as maintenance or line expansion), traditional fixing methods require damaging the pipe or using special tools, which is cumbersome and easy to damage the cable, resulting in low construction efficiency. Utility Model Content

[0008] The purpose of this invention is to provide a bending-resistant CPVC cable protection pipe to solve the problems mentioned in the background art.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] A bending-resistant CPVC cable protection pipe includes a protection pipe body, one end of which has an installation groove, and the inner wall of the installation groove is provided with an elastic component.

[0011] The inner wall of the protective tube body is fixedly connected to a connecting pipe, and a positioning component is provided at one end of the connecting pipe.

[0012] The positioning component includes an internally threaded closed cylinder that mates with the threaded connector of the connecting pipe. The outer wall of the end of the connecting pipe away from the protective pipe body is threadedly connected to the inner wall of the internally threaded closed cylinder. One end of the connecting pipe abuts against a connecting collar.

[0013] A further improvement of the present invention is that: a limiting cylinder is fixedly connected to the end of the docking collar away from the docking tube, a compensation groove is provided on the side of the limiting cylinder, and a built-in limiting cone is fixedly connected to the inner wall of the internally threaded closed cylinder near one end.

[0014] A further improvement of this utility model is that the inner wall of the built-in limiting cone is movably connected to the outer wall of the limiting cylinder.

[0015] A further improvement of the present invention is that the elastic component includes an annular support spring, the annular support spring is fixedly connected to the inner wall of the mounting groove, and an arc-shaped spring is fixedly connected to the side of the annular support spring.

[0016] A further improvement of this utility model is that a spring rubber column is inserted into the inner wall of the annular support spring.

[0017] A further improvement of this utility model is that a sealing head is fixedly connected to one end of the spring rubber column.

[0018] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0019] 1. This utility model provides a bending-resistant CPVC cable protection pipe. Through the threaded connection of the positioning component and the conical extrusion structure, adjustable fastening of the cable is achieved: the threaded engagement between the internal threaded closed cylinder and the threaded connection of the connecting pipe allows for dynamic adjustment of the clamping force of the limiting cylinder on the cable by the tightening degree, accommodating the fixing needs of cables of different diameters; the built-in limiting cone and the conical extrusion design of the limiting cylinder force the limiting cylinder to elastically contract through the compensation groove when tightened, tightly fitting the outer wall of the cable to form a mechanical clamping force, ensuring reliable fixing without additional tools, and improving installation efficiency by more than 40%.

[0020] 2. This utility model provides a bending-resistant CPVC cable protection pipe. The elastic components in the installation groove construct an integrated protection system of "support-buffering-sealing": the annular support spring and the arc-shaped spring are evenly distributed circumferentially, and absorb external bending stress through elastic deformation, avoiding the pipe from cracking due to stress concentration. The bending resistance is improved by 35% compared with traditional CPVC pipes; the spring rubber column cooperates with the sealing head to form a flexible sealing layer when the cable is inserted, effectively blocking the intrusion of moisture and dust. At the same time, the elastic deformation of the rubber adapts to the slight displacement of the cable, preventing hard pulling damage to the cable, and meeting the IP65 level sealing protection requirements.

[0021] 3. This utility model provides a bending-resistant CPVC cable protection pipe. The three-dimensional support structure and multi-level buffer system work synergistically to systematically improve the pipe's mechanical properties: axially, the rigid threaded connection between the butt joint and the internally threaded closed cylinder restricts longitudinal deformation; radially, the conical clamping of the limiting cylinder and the built-in limiting cone enhances circumferential stiffness, with a circumferential stiffness test value ≥8kN / m. 2 (Superior to industry standards); The elastic components and rigid support structure form a "rigid-flexible coupling" anti-bending system, which can withstand dynamic bending loads (no cracking in drop hammer impact test) and eliminate fatigue gaps in long-term use through adjustable design, ensuring long-term stable anti-bending performance, and is suitable for harsh scenarios such as rail transit and building electrical systems. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the connecting pipe structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the positioning component structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the internal threaded closed cylinder structure of this utility model.

[0026] In the diagram: 1. Protective tube body; 2. Positioning component; 3. Connecting tube; 4. Mounting groove; 5. Annular support spring; 6. Arc-shaped spring; 7. Spring rubber column; 8. Internal threaded closed cylinder; 9. Connecting collar; 10. Limiting cylinder; 11. Compensation groove; 12. Built-in limiting cone. Detailed Implementation

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The present invention will be further described in detail below with reference to embodiments:

[0029] Example 1

[0030] like Figure 1-4As shown, this utility model provides a bending-resistant CPVC cable protection pipe, including a protection pipe body 1, with an installation groove 4 at one end of the protection pipe body 1, and an elastic component provided on the inner wall of the installation groove 4.

[0031] The inner wall of the protective tube body 1 is fixedly connected to the connecting tube 3, and a positioning component 2 is provided at one end of the connecting tube 3;

[0032] The positioning component 2 includes an internally threaded closed cylinder 8 that is threadedly connected to the connecting pipe 3. The outer wall of the end of the connecting pipe 3 away from the protective pipe body 1 is threadedly connected to the inner wall of the internally threaded closed cylinder 8. One end of the connecting pipe 3 is abutted against a connecting collar 9.

[0033] Example 2

[0034] like Figure 1-4 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, a limiting cylinder 10 is fixedly connected to the end of the mating collar 9 away from the mating tube 3, and a compensation groove 11 is provided on the side of the limiting cylinder 10. An internally threaded closed cylinder 8 is fixedly connected to the inner wall of its end near one end with a built-in limiting cone 12. The inner wall of the built-in limiting cone 12 is movably connected to the outer wall of the limiting cylinder 10. The elastic component includes an annular support spring 5, which is fixedly connected to the inner wall of the mounting groove 4. An arc-shaped spring 6 is fixedly connected to the side of the annular support spring 5.

[0035] A spring rubber post 7 is inserted into the inner wall of the annular support spring 5. A sealing head is fixedly connected to one end of the spring rubber post 7.

[0036] The working principle of this bend-resistant CPVC cable protection pipe will be explained in detail below.

[0037] like Figure 1-4 As shown, the working principle of positioning component 2 is as follows:

[0038] In the initial installation state, the outer wall of the end of the connector 3 furthest from the protective pipe body 1 has an external thread, which mates with the inner thread of the inner threaded sealing cylinder 8. The mating collar 9 abuts against the end of the connector 3, and its end furthest from the connector 3 is fixedly connected to the limiting cylinder 10. The compensation groove 11 opened on the side of the limiting cylinder 10 gives it radial elastic deformation capability. In the initial state, there is a small gap between the inner wall of the limiting cylinder 10 and the outer wall of the cable, which facilitates the cable insertion.

[0039] During the tightening and fixing process, when it is necessary to fix the cable, rotate the internally threaded closed cylinder 8 clockwise, causing it to move axially along the external thread of the connector 3. The built-in limiting cone 12, which is fixed to the inner wall of the internally threaded closed cylinder 8, moves synchronously with the internally threaded closed cylinder 8, and its conical inner wall gradually presses against the outer wall of the limiting cylinder 10. Due to the presence of the compensation groove 11, the limiting cylinder 10 contracts and deforms inward under radial pressure, forcing the inner wall of the limiting cylinder 10 to fit tightly against the outer wall of the cable. Figure 2As shown. At this time, the limiting cylinder 10 fixes the cable by the clamping force generated by the deformation, and at the same time, the thread preload of the connecting pipe 3 and the internal threaded closed cylinder 8 forms an axial rigid support, which improves the bending strength of the protective pipe body 1.

[0040] During adjustment and disassembly, rotating the internally threaded closed cylinder 8 counterclockwise causes the internal limiting cone 12 to move away from the limiting cylinder 10. The limiting cylinder 10 returns to its original shape due to the elastic restoring force of the compensation groove 11, and the clamping force between it and the cable's outer wall disappears, allowing for free adjustment of the cable position or disassembly of the conduit. After adjustment, simply tighten the internally threaded closed cylinder 8 again to re-secure it.

[0041] II. The principle of synergistic effect of elastic components

[0042] The elastic components on the inner wall of the mounting groove 4 include annular support spring 5, arc-shaped spring 6, and spring rubber column 7.

[0043] The annular support springs 5 ​​are evenly distributed circumferentially and fixed to the inner wall of the mounting groove 4, providing basic support for the arc-shaped springs 6. When the protective pipe body 1 is subjected to external bending force, the arc-shaped springs 6 absorb stress through their own bending deformation, avoiding stress concentration that could lead to pipe breakage; their elastic recovery force can offset some of the deformation and enhance the bending resistance.

[0044] The spring rubber post 7 is inserted into the inner wall of the annular support spring 5, with a sealing head fixed at one end. When the cable is inserted, the spring rubber post 7 is compressed and undergoes elastic deformation, tightly wrapping the cable surface to form a sealing layer. Figure 3 As shown, this prevents moisture and dust from entering. When the pipe is bent, the flexible deformation of the spring rubber column 7 can adapt to the slight displacement of the cable, avoiding damage to the cable from hard pulling, while the rubber elasticity buffers external impact forces.

[0045] III. Mechanism for Achieving Bending Resistance

[0046] Three-dimensional support structure

[0047] Axial direction: The threaded connection between the butt joint 3 and the internally threaded closed cylinder 8 forms a rigid support, restricting the longitudinal tensile or compressive deformation of the pipe.

[0048] Radial direction: The conical extrusion structure of the limiting cylinder 10 and the built-in limiting cone cylinder 12 provides radial clamping force, enhances radial stiffness, and suppresses radial collapse during bending.

[0049] The annular support spring 5, the arc-shaped spring 6, and the spring rubber column 7 within the multi-level elastic buffer system mounting slot 4 constitute a three-level buffer structure.

[0050] Primary buffer: Arc-shaped spring sheet 6 absorbs the energy of external bending forces;

[0051] Secondary buffer: Spring rubber column 7 adapts to cable displacement through elastic deformation;

[0052] Level 3 support: The ring-shaped support spring 5 provides circumferential elastic recovery force to resist deformation.

[0053] The adjustable fastening design allows for dynamic adjustment of the clamping force of the limiting cylinder 10 on the cable by tightening the internal threaded closed cylinder 8. This not only meets the fixing requirements of cables of different diameters, but also eliminates gaps caused by fatigue deformation through secondary adjustment during long-term use of the pipe, thus maintaining its bending resistance.

[0054] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A bending-resistant CPVC cable protection pipe, comprising a protection pipe body (1), characterized in that: The protective tube body (1) has an installation groove (4) at one end, and the inner wall of the installation groove (4) is provided with an elastic component; The inner wall of the protective tube body (1) is fixedly connected to a connecting pipe (3), and a positioning component (2) is provided at one end of the connecting pipe (3); The positioning component (2) includes an internally threaded closed cylinder (8) that is threadedly connected to the connecting pipe (3). The outer wall of the connecting pipe (3) away from the protective pipe body (1) is threadedly connected to the inner wall of the internally threaded closed cylinder (8). One end of the connecting pipe (3) abuts against a connecting collar (9).

2. The bending-resistant CPVC cable protection pipe according to claim 1, characterized in that: The end of the docking collar (9) away from the docking tube (3) is fixedly connected to a limiting cylinder (10), and the side of the limiting cylinder (10) is provided with a compensation groove (11). The inner wall of the internal threaded closed cylinder (8) near one end is fixedly connected to a built-in limiting cone (12).

3. The bending-resistant CPVC cable protection pipe according to claim 2, characterized in that: The inner wall of the built-in limiting cone (12) is movably connected to the outer wall of the limiting cylinder (10).

4. The bending-resistant CPVC cable protection pipe according to claim 1, characterized in that: The elastic component includes an annular support spring (5), which is fixedly connected to the inner wall of the mounting groove (4), and an arc-shaped spring (6) is fixedly connected to the side of the annular support spring (5).

5. The bending-resistant CPVC cable protection pipe according to claim 4, characterized in that: A spring rubber column (7) is inserted into the inner wall of the annular support spring (5).

6. The bending-resistant CPVC cable protection pipe according to claim 5, characterized in that: A sealing head is fixedly connected to one end of the spring rubber column (7).

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