Composite plastic pipeline

Abstract

The utility model discloses a composite plastic pipeline, which belongs to the technical field of plastic pipelines, the composite plastic pipeline sequentially comprises a sealing ring, an inner layer pipe, a middle layer pipe, an outer layer pipe and a protective layer from inside to outside, the protective layer is spirally wound along the outer wall of the outer layer pipe, and bamboo ribs extending along the axial direction of the outer layer pipe are uniformly distributed in the outer layer pipe. By the adoption of the composite plastic pipeline, the shock resistance and deformation resistance are improved, microcracks can be automatically repaired when the pipeline is damaged, and the sealing performance of the connecting part can be automatically adjusted according to environmental changes.

Description

Technical Field

[0001] This utility model relates to the field of plastic pipe technology, and in particular to a composite plastic pipe. Background Technology

[0002] Currently, plastic pipes are widely used in municipal water supply and drainage, gas transmission, and chemical fluid transportation due to their advantages such as lightweight, corrosion resistance, and ease of installation. However, most traditional plastic pipes use a single layer of homogeneous material (such as PVC, PE, or PP), which, while possessing a certain degree of flexibility, has low impact resistance and ring stiffness. Under buried construction or external loads (such as vehicle traffic or soil settlement), the pipes are prone to local deformation or even rupture. In low-temperature environments, the brittleness of plastic materials increases, making them more susceptible to cracking from external impacts. Although some improved pipes use fiber reinforcement or metal linings, this often leads to a significant increase in cost and affects the pipe's flexibility and weldability. Secondly, the connection methods of plastic pipes (such as butt fusion, socket connection, or flange connection) rely on manual operation. If construction is improper or materials age, micro-leakage is prone to occur at the joints. Especially under pressure fluctuations or temperature changes, traditional rubber sealing rings may fail due to permanent compression deformation. In addition, underground pipelines are affected by soil displacement, and misalignment is prone to occur at the joints, further exacerbating the risk of leakage. Although existing technologies employ adhesives or metal clamps for reinforcement, sealing failure may still occur after long-term use.

[0003] To improve performance, multi-layer composite pipes (such as PE / AL / PE, PP-R / GF, etc.) have appeared on the market. However, the thermal expansion coefficients of different materials vary greatly, which may lead to delamination after long-term use. Furthermore, the pipe materials cannot achieve self-repair and cannot adapt to pressure and temperature changes to achieve self-adaptive sealing. Utility Model Content

[0004] The purpose of this invention is to provide a composite plastic pipe that not only improves the impact and deformation resistance of the composite plastic pipe, but also automatically repairs micro-cracks when the pipe is damaged, and the connection parts can automatically adjust the sealing performance according to environmental changes.

[0005] To achieve the above objectives, this utility model provides a composite plastic pipe, which includes, from the inside out, a sealing ring, an inner tube, a middle tube, an outer tube, and a protective layer. The protective layer is spirally wound along the outer wall of the outer tube, and bamboo ribs extending axially along the outer tube are evenly distributed inside the outer tube.

[0006] Preferably, the inner tube is made of polypropylene, the middle tube is made of thermoplastic polyurethane and microencapsulated repair agent, and the outer tube is made of high-density polyethylene and nano-silica.

[0007] Preferably, one end of the inner tube is provided with an annular notch, which matches the sealing ring.

[0008] Preferably, the sealing ring is made of shape memory alloy.

[0009] Preferably, the protective layer is made of either glass fiber or aramid fiber.

[0010] Preferably, the spiral winding angle of the protective layer is 45-60°.

[0011] Therefore, the present invention, employing the aforementioned composite plastic pipe, has the following beneficial effects:

[0012] (1) By adding nano-silica and setting a spiral-wound protective layer, the impact resistance and deformation resistance of composite plastic pipes are improved;

[0013] (2) By adding microencapsulated repair agent, it can adapt to stress fracture when microcracks occur in the intermediate layer tube, prevent the expansion of microcracks, and realize the self-repair of the intermediate layer tube, thus preventing direct damage to the inner layer tube.

[0014] (3) By setting a sealing ring made of shape memory alloy at one end of the inner tube, it is possible to achieve thermal expansion or thermal expansion through specific composition design or structural control, thereby achieving adaptive sealing of the connection part according to temperature changes.

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a composite plastic pipe according to Embodiment 1 of this utility model;

[0017] Figure 2 This is a cross-sectional schematic diagram of a first embodiment of a composite plastic pipe according to this utility model.

[0018] Figure Labels

[0019] 1. Bamboo reinforcement; 2. Outer tube; 3. Middle tube; 4. Inner tube; 5. Sealing ring; 6. Protective layer. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] All materials mentioned in each part of the instruction manual are publicly available materials in the prior art.

[0023] Example 1

[0024] like Figures 1 to 2 As shown, this utility model provides a composite plastic pipe, which includes a sealing ring 5, an inner pipe 4, a middle pipe 3, an outer pipe 2, and a protective layer 6 from the inside out. Through the multi-layer structure design, it achieves good sealing performance, corrosion resistance, pressure bearing capacity and protective performance, and is suitable for fluid transportation under various complex working conditions.

[0025] The protective layer 6 is made of fiberglass and is used to protect the outer tube 2 from external environmental influences, such as ultraviolet radiation and chemical corrosion. The protective layer 6 is spirally wound along the outer wall of the outer tube 2 at an angle of 45°, which can balance axial and circumferential strength and improve the wear resistance and impact resistance of the composite plastic pipe.

[0026] The outer tube 2 is made of high-density polyethylene and nano-silica, providing overall structural strength and durability for the composite plastic pipe. Bamboo ribs 1 are evenly distributed inside the outer tube 2, extending axially. These bamboo ribs 1 enhance the pipe's compressive and bending resistance, making it less prone to deformation under external forces. Furthermore, the bamboo ribs 1 are lighter than copper pillars, reducing the transportation costs of the composite plastic pipe.

[0027] The intermediate layer tube 3 is made of thermoplastic polyurethane and microencapsulated repair agent. The microencapsulated repair agent can adapt to stress fracture when microcracks occur in the intermediate layer tube 3, prevent the expansion of microcracks, and achieve self-repair of the intermediate layer tube 3, preventing direct damage to the inner layer tube 4.

[0028] The inner tube 4 is made of polypropylene, and one end of the inner tube 4 has an annular notch that matches the sealing ring 5. The sealing ring 5 is made of Ni-Ti-Nb shape memory alloy that expands when heated. After being pre-compressed, the sealing ring 5 is embedded into the annular notch of the inner tube 4. When the temperature rises, the sealing ring 5 can expand radially to achieve a self-tightening seal. It is more heat-resistant (up to 200℃) than traditional rubber sealing rings and has no aging problems.

[0029] Therefore, this utility model adopts the above-mentioned composite plastic pipe, which improves the impact resistance and deformation resistance of the composite plastic pipe by adding nano-silica and setting a spirally wound protective layer; by adding microencapsulated repair agent, it can adapt to stress fracture when microcracks occur in the middle layer pipe, prevent the expansion of microcracks, and realize the self-repair of the middle layer pipe, preventing direct damage to the inner layer pipe; by setting a sealing ring made of shape memory alloy material at one end of the inner layer pipe, it can realize thermal expansion or thermal expansion through specific component design or structural control, thereby realizing adaptive sealing of the connection part according to temperature changes.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A composite plastic pipe, characterized in that: The composite plastic pipe comprises, from the inside out, a sealing ring, an inner tube, a middle tube, an outer tube, and a protective layer. The protective layer is spirally wound along the outer wall of the outer tube, and bamboo ribs extending axially along the outer tube are evenly distributed inside the outer tube.

2. The composite plastic pipe according to claim 1, characterized in that: The inner tube is made of polypropylene.

3. The composite plastic pipe according to claim 1, characterized in that: One end of the inner tube is provided with an annular notch, which matches the sealing ring.

4. The composite plastic pipe according to claim 1, characterized in that: The sealing ring is made of shape memory alloy.

5. A composite plastic pipe according to claim 1, characterized in that: The protective layer is made of either glass fiber or aramid fiber.

6. A composite plastic pipe according to claim 1, characterized in that: The protective layer is spirally wound at an angle of 45-60°.

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