End reinforced psp steel plastic composite pipe

Abstract

A PSP steel-plastic composite pipe with end reinforcement effectively solves the problem of poor connection applicability of existing PSP steel-plastic composite pipes. It includes a pipe body with a bend at the end formed by a flaring and bending process. The bending angle of the bend is 60° to 90°. The outer surface of the bend is covered with an injection-molded plastic flange reinforcement joint. The end face of the plastic flange reinforcement joint is a heat-fusion connection surface for heat-fusion butt welding with the plastic flange reinforcement joints of adjacent pipes. This structure is simple, novel in design, convenient to use, and highly practical.

Description

Technical Field

[0001] This utility model relates to the field of pipeline technology, and in particular to a PSP steel-plastic composite pipeline with end reinforcement. Background Technology

[0002] PSP steel-plastic composite pipes, as a new type of pipe material, have been widely used in industrial park water supply and secondary water supply due to their advantages such as high pressure resistance, good straightness, and high ring stiffness. However, this pipe material faces significant technical bottlenecks in actual engineering applications: the currently commonly used flared connections and electromagnetic fusion connections are limited by pipe fitting molds and production processes, supporting pipe connections up to DN200mm in diameter, which severely restricts the promotion and application of large-diameter PSP pipes of DN250mm and above. At the same time, existing connection methods have inherent defects—flared connections rely on cast iron fittings, metal flanges, and bolts, and after several years of buried use, metal components are prone to corrosion, leading to leakage and failure at the joints; electromagnetic fusion connections require specialized equipment and are complex to operate, with welding quality easily affected by voltage fluctuations, resulting in high construction thresholds and unreliable performance. Therefore, these technical defects not only limit the application of PSP pipes in large-diameter scenarios but also increase the total life-cycle maintenance costs. Utility Model Content

[0003] In view of the above situation and in order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an end-reinforced PSP steel-plastic composite pipe, which effectively solves the problem of poor connection applicability of existing PSP steel-plastic composite pipes.

[0004] The technical solution is that the present invention includes a pipe body, the end of which is provided with a bent part formed by a flaring and bending process, the bending angle of the bent part being 60° to 90°, and the outer surface of the bent part being covered with an injection-molded plastic flange reinforcement joint, the end face of the plastic flange reinforcement joint being a heat-fusion connection surface, used for heat-fusion butt welding with the plastic flange reinforcement joint of the adjacent pipe.

[0005] Preferably, the material of the plastic flange reinforced joint is polyethylene or polypropylene.

[0006] Preferably, the mating surface between the plastic flange reinforced joint and the bent portion has a tenon-and-mortise interlocking structure.

[0007] Preferably, the diameter of the hot-melt connection surface is larger than the outer diameter of the pipe body, and its thickness is 1.5-3 times the pipe body wall thickness.

[0008] Preferably, the adjacent plastic flange reinforcing joints are connected to form a continuous pipeline by hot-melt butt welding.

[0009] Compared with the prior art, the beneficial effects of this utility model are: it realizes reliable hot-melt connection of large-diameter PSP pipes with a diameter of 250mm and above, solves the defects of traditional flared connection and electromagnetic fusion connection that cannot support large-diameter pipes due to process limitations, and completely eliminates the risk of slippage between steel and plastic layers caused by thermal expansion and contraction, and eliminates the hidden danger of leakage at the pipe end, thereby improving the long-term sealing stability of buried pipelines. In addition, the plastic flange reinforced joint avoids the interface failure problem caused by the corrosion of metal parts, and extends the service life of the pipeline. Attached Figure Description

[0010] Figure 1 This is the main view axonometric drawing of this utility model.

[0011] Figure 2 This is a full-section main view axonometric drawing of this utility model.

[0012] Figure 3 This is a connection diagram of this utility model.

[0013] Figure 4 This is a partial view of the plastic flange reinforced joint in this utility model.

[0014] Figure label: 1. Pipe body; 2. Bending section; 3. Plastic flange reinforced joint; 4. Hot melt connection surface. Detailed Implementation

[0015] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the implementations of the base model disclosed below.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0018] Depend on Figures 1 to 4The device includes a pipe body 1, with a bent portion 2 formed by a flaring and bending process at the end of the pipe body 1. The bending angle of the bent portion 2 is 60° to 90°. The outer surface of the bent portion 2 is covered with an injection-molded plastic flange reinforcement joint 3. The end face of the plastic flange reinforcement joint 3 is a heat-fusion connection surface 4, which is used for heat-fusion butt welding with the plastic flange reinforcement joint 3 of the adjacent pipe.

[0019] Preferably, the plastic flange reinforced joint 3 is made of polyethylene or polypropylene.

[0020] Preferably, the mating surfaces of the plastic flange reinforced joint 3 and the bending portion 2 have a tenon-and-mortise interlocking structure.

[0021] Preferably, the diameter of the hot-melt connection surface 4 is larger than the outer diameter of the pipe body 1, and its thickness is 1.5-3 times the wall thickness of the pipe body 1.

[0022] Preferably, the adjacent plastic flange reinforcing joints 3 are connected to form a continuous pipeline by hot-melt butt welding.

[0023] When using this utility model, the construction party first obtains the finished pipe material with plastic flange reinforcement joints 3 prefabricated at both ends of the pipe body 1 (the end 60° to 90° flaring and injection molding process has been completed at the factory). When laying the pipeline at the construction site, the operator uses a hot melt butt welding machine to align the hot melt connection surfaces 4 of the two pipe bodies 1 and clamp them in the welding machine fixture. The hot melt connection surfaces 4 of the plastic flange reinforcement joint 3 are simultaneously heated to a molten state by the heating plate. Then the heating plate is removed and axial pressure is quickly applied to make the two hot melt connection surfaces 4 fit tightly together. During the pressure holding and cooling process, the molten plastic molecular chains diffuse and intertwine with each other, eventually forming a uniform and dense fusion zone at the joint, achieving a permanent sealed connection between the pipes. The above hot-melt butt welding operation is repeated until all pipe sections are spliced, forming a continuous sealed pipeline system without metal parts and resistant to corrosion. The tenon and mortise interlocking structure of the plastic flange reinforced joint 3 and the bend 2 of the pipe body 1 can effectively suppress interlayer slippage caused by thermal expansion and contraction, ensuring the long-term sealing stability of the pipeline under buried conditions.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows: the end bending part and plastic flange reinforced joint realize reliable heat fusion connection of large-diameter PSP pipes with DN250mm and above, which solves the defects of traditional flared connection and electromagnetic fusion connection that cannot support large-diameter pipes due to process limitations. At the same time, the tenon and mortise interlocking structure completely eliminates the risk of slippage between steel and plastic layers caused by thermal expansion and contraction, and eliminates the hidden danger of leakage at the pipe end, which improves the long-term sealing stability of buried pipelines. In addition, the plastic flange reinforced joint avoids the interface failure problem caused by the corrosion of metal parts, and extends the service life of the pipeline. This structure is simple, novel in concept, convenient to use, and highly practical.

[0025] It should be noted that, depending on the implementation needs, the various components described in the embodiments of this utility model can be split into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of this utility model.

[0026] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A PSP steel-plastic composite pipe with end reinforcement, comprising a pipe body (1), characterized in that, The pipe body (1) has a bent part (2) formed by the flaring and bending process at the end. The bending angle of the bent part (2) is 60° to 90°. The outer surface of the bent part (2) is covered with an injection-molded plastic flange reinforcement joint (3). The end face of the plastic flange reinforcement joint (3) is a hot-melt connection surface (4) for hot-melt butt welding with the plastic flange reinforcement joint (3) of the adjacent pipe.

2. The PSP steel-plastic composite pipe with end reinforcement according to claim 1, characterized in that, The plastic flange reinforced joint (3) is made of polyethylene or polypropylene.

3. The PSP steel-plastic composite pipe with end reinforcement according to claim 1, characterized in that, The joint surface of the plastic flange reinforced joint (3) and the bending part (2) has a tenon and mortise interlocking structure.

4. The PSP steel-plastic composite pipe with end reinforcement according to claim 1, characterized in that, The diameter of the hot-melt connection surface (4) is larger than the outer diameter of the pipe body (1), and its thickness is 1.5-3 times the wall thickness of the pipe body (1).

5. The PSP steel-plastic composite pipe with end reinforcement according to claim 4, characterized in that, The adjacent plastic flange reinforced joint (3) forms a continuous pipeline through hot-melt butt welding.

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