Modified polypropylene sheath pipe for power cable

Abstract

The utility model relates to a modified polypropylene sheath pipe for a power cable, which comprises an outer sheath and a middle reinforcing layer, wherein the outer sheath is provided with a plurality of annular bulge structures which are uniformly distributed along the longitudinal direction of the pipe, and the middle reinforcing layer is of a net-shaped structure which is formed by arranging a plurality of spiral reinforcing ribs in a staggered manner; and the inner layer sheath is provided with a plurality of micropores which are uniformly distributed. According to the structure, the compression resistance, the tensile resistance and the impact resistance of the power cable sheath pipe are remarkably enhanced, and meanwhile, the light weight and the flexibility of the pipe are kept.

Description

Technical Field

[0001] The utility model relates to the field of power cable protection, and more specifically, to a modified polypropylene sheath pipe for power cables. Background Art

[0002] Power cables are widely used in power transmission in various industrial, commercial, and residential areas. Especially when laid underground or used outdoors, the protection of the cables is particularly important. The sheath of a power cable not only needs to provide basic mechanical protection, such as preventing the cable core from being squeezed and stretched, but also must have excellent environmental adaptability, such as wear resistance, corrosion resistance, weather resistance, and the ability to resist ultraviolet rays and chemical erosion.

[0003] Traditional cable sheath materials, such as polyvinyl chloride (PVC) and cross-linked polyethylene (XLPE), although meeting the basic protection requirements to a certain extent, are prone to aging in high-temperature environments. Especially when exposed to ultraviolet rays for a long time, they will become brittle, resulting in sheath cracking, seriously affecting the service life of the cable. At the same time, PVC materials will release harmful gases when burned, posing a certain environmental risk.

[0004] In addition, traditional sheath structures also have deficiencies in dealing with complex mechanical stresses. For example, when subjected to high-intensity stretching, impact, or bending, the sheath is prone to deformation or rupture, unable to provide effective protection. In this case, the internal conductor of the cable may be damaged, resulting in power transmission interruption and even more serious safety accidents.

[0005] Currently, the market demand for high-performance sheath materials is increasing, especially those that can operate stably for a long time in harsh environments. At the same time, in order to meet higher mechanical performance requirements, the structural design of the sheath has become increasingly important. Although the existing multi-layer sheath design has improved the strength of the sheath to a certain extent, it still cannot fully meet the higher requirements for tensile, impact, and extrusion resistance.

[0006] Therefore, it is urgent to develop a new type of cable sheath material and its structural design, which can not only provide stronger mechanical protection but also maintain its performance stability when exposed to complex environmental conditions for a long time. This will help extend the service life of power cables, reduce maintenance costs, and improve the overall safety and reliability of the power system. Summary of the Utility Model

[0007] To solve the above problems, the utility model provides a modified polypropylene sheath pipe for power cables. Through a reasonable multi-layer structure design, the mechanical properties and durability of the sheath are enhanced, and reliable protection can be provided in various harsh environments.

[0008] To achieve the above object, the present utility model provides the following technical solutions, mainly including:

[0009] A modified polypropylene sheath pipe for power cables, comprising the following structures:

[0010] Outer sheath: The outer sheath is provided with a plurality of annular convex structures uniformly distributed along the longitudinal direction of the pipe. These convex structures help to improve the compressive resistance and wear resistance of the pipe, enabling it to better protect the cable when subjected to external pressure.

[0011] Intermediate reinforcement layer: The intermediate reinforcement layer is a network structure composed of a plurality of helical reinforcing ribs arranged in a staggered manner. This design not only improves the tensile resistance and impact resistance of the pipe, but also increases the overall strength of the pipe, ensuring that it can still maintain its shape and structural integrity in a complex application environment.

[0012] Inner sheath: The inner sheath is provided with a plurality of uniformly distributed micropores. These micropores are used to reduce the overall weight of the pipe, while providing a certain buffering effect to absorb external impacts and protect the internal cable. The flexibility of the inner sheath makes the pipe easier to operate during installation and use.

[0013] Through the above technical solutions, compared with the prior art, the present utility model significantly enhances the compressive, tensile and impact resistance of the power cable sheath pipe through a unique multi-layer structure design, while maintaining the light weight and flexibility of the pipe. This sheath pipe is especially suitable for use in harsh outdoor or underground environments, can effectively extend the service life of the cable, and improve the safety and reliability of the overall system. Brief Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0015] Figure 1 It is a three-dimensional structure schematic diagram of the present utility model.

[0016] Figure 2 It is a side structure schematic diagram of the present utility model;

[0017] Explanation of the reference numerals in the drawings: 1 - outer sheath, 101 - annular convex structure, 2 - intermediate reinforcement layer, 3 - inner sheath, 301 - micropore. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Embodiment

[0020] Structural Design and Preparation of a Modified Polypropylene Sheath Pipe for Power Cables

[0021] See Figure 1 And Figure 2 , this embodiment describes the specific structure and preparation method of a modified polypropylene sheath pipe for power cables. The pipe is composed of three main structures, namely an outer sheath 1, an intermediate reinforcement layer 2, and an inner sheath 3.

[0022] The aforementioned outer sheath 1:

[0023] Material: A modified polypropylene material resistant to ultraviolet rays is selected. This material is treated with special additives and can maintain good mechanical properties and weather resistance after long-term exposure to ultraviolet rays.

[0024] Structure: The outer sheath 1 is provided with a plurality of annular protrusion structures 101 evenly distributed along the longitudinal direction of the pipe. The height of these annular protrusion structures 101 is set to 2 mm, and the spacing is 10 mm. This design helps to improve the compressive capacity and wear resistance of the pipe, enabling it to better resist external pressure and friction during laying and use.

[0025] The aforementioned intermediate reinforcement layer 2:

[0026] Material: It is made of a high-strength fiber material to provide excellent mechanical strength and toughness.

[0027] Structure: The intermediate reinforcement layer 2 is a mesh structure composed of a plurality of helical reinforcing ribs arranged in a staggered manner. These helical reinforcing ribs are arranged with a pitch of 5 mm, enabling the entire structure to evenly disperse stress when subjected to tension and impact, preventing structural damage caused by local stress concentration. The design of this layer significantly enhances the tensile and impact resistance of the pipe, ensuring its service life in complex environments.

[0028] The aforementioned inner sheath 3:

[0029] Material: It also uses a modified polypropylene material to ensure the same material characteristics as the outer sheath 1, thereby avoiding interface problems caused by material differences.

[0030] Structure: Multiple evenly distributed micropores 301 are provided on the inner sheath 3, and the diameter of these micropores 301 is 1 mm. These micropores are designed to ensure weight reduction of the pipe while providing good buffering effect, capable of absorbing external impact forces and protecting the internal cable from damage.

[0031] Preparation method:

[0032] The protective pipe is prepared by co-extrusion process. First, the outer sheath 1 material is extruded through an extruder to form the outer layer of the pipe with an annular protrusion structure 101; then, the spiral reinforcing rib material of the middle reinforcing layer 2 is extruded through a die and wound around the outer sheath 1 to form an interleaved mesh structure; finally, the inner sheath 3 material is extruded and attached to the inner side of the middle reinforcing layer 2 to form the inner sheath 3 with micropores 301.

[0033] During the preparation process, by strictly controlling the temperature, pressure and extrusion speed, it is ensured that the materials of each layer can be well combined to form a protective pipe with stable structure and excellent performance. After cooling, shaping and cutting, the final power cable protective pipe is obtained.

[0034] Performance test:

[0035] A series of performance tests were carried out on the prepared protective pipe, including compressive, tensile, impact resistance tests, and ultraviolet aging test. The test results show that the protective pipe performs excellently in various performance indicators. Especially in terms of tensile strength and weather resistance, it is far superior to traditional cable sheath materials and is suitable for long-term use in complex and harsh environments.

[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Modified polypropylene sheath tubing for power cables, characterized in that, The described protective tube material includes: An outer sheath (1) provided with a plurality of annular protrusion structures (101) uniformly distributed along the longitudinal direction of the tube; An intermediate reinforcement layer (2), a net-like structure composed of a plurality of helical reinforcing ribs arranged in a staggered manner; An inner sheath (3) provided with a plurality of uniformly distributed micropores (301).

2. The modified polypropylene sheath tube for power cables according to claim 1, wherein The height of the annular protrusion structure (101) is 1-3 mm, and the spacing is 5-15 mm.

3. The modified polypropylene sheath tube for power cables according to claim 1, characterized in that, The pitch of the helical reinforcing ribs of the intermediate reinforcement layer (2) is 3-8 mm.

4. The modified polypropylene sheath tube for power cables according to claim 1, wherein The diameter of the micropores (301) of the inner sheath (3) is 0.5-2 mm.

5. The modified polypropylene sheath tube for power cables according to claim 1, wherein The material of the outer sheath (1) is selected as modified polypropylene with ultraviolet resistance performance.

6. The modified polypropylene sheath tube for power cables according to claim 1, characterized in that, The net-like structure of the intermediate reinforcement layer (2) is woven from high-strength fibers.

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