A plate-type liner for plastic pipes

Abstract

This utility model relates to a plate-type inner liner for plastic pipes, comprising a cylindrical body with a notch in its radial direction to form two cross-sections. When the cylindrical body is compressed, its diameter changes, and the two cross-sections approach each other, transitioning from a first state to a second state. In the first state, the outer diameter of the cylindrical body is larger than the inner diameter of the pipe; in the second state, the outer diameter of the cylindrical body is smaller than the inner diameter of the pipe. This utility model, with its radially notched cylindrical body forming a deformable elastic structure, enables the inner liner to have the ability to change diameter, with the outer diameter being larger than the inner diameter of the pipe in the first state and smaller in the second state. This design overcomes the limitation of traditional rigid inner liners that cannot adapt to changes in pipe diameter, utilizing elastic restoring characteristics to achieve tight support for the inner wall of the pipe, thus solving the connection reliability problem caused by pipe deformation.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline repair technology, and specifically relates to a plate-type inner lining for plastic pipelines. Background Technology

[0002] In urban infrastructure construction, plastic pipes are widely used in fluid transportation fields such as water supply, drainage, and gas supply due to their advantages such as corrosion resistance, good flexibility, and convenient construction. Especially in urban water supply pipeline systems, the rapid repair and connection technology of PE pipes is a key link in ensuring the stable operation of the pipeline network.

[0003] Currently, when PE pipes are connected during installation or pipe breakage repair, the pipe joints often deform due to external forces, leading to a reduction in pipe diameter. This deformation directly affects the sealing and reliability of the pipe connection, potentially causing leaks, pressure losses, and even requiring secondary repairs, increasing maintenance and time costs.

[0004] In existing technologies, many pipe repair linings use rigid structures, which cannot adapt to changes in pipe diameter after deformation, and are prone to poor compatibility during installation. Utility Model Content

[0005] This utility model addresses the problems of the prior art by providing a plate-type inner lining for plastic pipes. The specific technical solution is as follows:

[0006] A plate-type inner liner for a plastic pipe includes a cylindrical body having a notch in the radial direction to form two cross-sections. The cylindrical body changes diameter when compressed, and the two cross-sections move closer to each other and transition from a first state to a second state. In the first state, the outer diameter of the cylindrical body is larger than the inner diameter of the pipe, and in the second state, the outer diameter of the cylindrical body is smaller than the inner diameter of the pipe.

[0007] As a further technical solution of this utility model, multiple sets of convex teeth are arranged axially on both cross surfaces, and the convex teeth on the two cross surfaces are arranged crosswise to couple in the second state.

[0008] As a further technical solution of this utility model, in the first state, the protruding teeth of the two cross-sections at least partially overlap in the circumferential direction.

[0009] As a further technical solution of this utility model, the protruding teeth are arranged at equal intervals on the cross-section, and a keyway is formed between two adjacent protruding teeth. In the second state, the protruding teeth completely fill the keyway to form a smooth curved surface.

[0010] As a further technical solution of this utility model, the width of the convex tooth gradually decreases as it extends toward the free end to form a tapered guide structure.

[0011] The beneficial effects of this utility model are as follows:

[0012] (1) The innovativeness of the variable diameter structure design;

[0013] The cylindrical body has radially notched sections, forming a deformable elastic structure that allows the liner to have a variable diameter capability: "in the first state, the outer diameter is larger than the inner diameter of the pipe, and in the second state, the outer diameter is smaller than the inner diameter of the pipe." This design overcomes the limitation of traditional rigid liners that cannot adapt to changes in pipe diameter. By utilizing elastic restoring characteristics, it achieves tight support for the inner wall of the pipe, solving the connection reliability problem caused by pipe deformation.

[0014] (2) Deformation resistance optimization of the toothed coupling structure;

[0015] The protruding teeth on the two cross sections are arranged in a cross pattern and at equal intervals. In the second state, the protruding teeth and keyways are fully filled and coupled, forming a smooth curved surface. This structure significantly improves the axial deformation resistance of the liner, preventing deformation due to axial forces on the pipe. Compared with traditional toothless structures, its mechanical properties are superior.

[0016] The design of the circumferentially overlapping of the convex teeth in the first state provides a motion trajectory guide for the cross-section to come together when the inner liner is deformed, ensuring the stability of the diameter change process. This detailed design enhances the practicality of the structure.

[0017] (3) Innovation in the ease of installation of the tapered guide structure;

[0018] The free end of the protruding tooth adopts a tapered design with a gradually narrowing width, forming a guiding structure. During extrusion and diameter change, it can guide the protruding teeth on both sections to precisely couple with the keyway, reducing installation difficulty and improving construction efficiency. This design solves the structural failure problem that may occur due to misalignment during the installation of traditional inner lining components. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a plate-type liner for plastic pipes is shown.

[0020] Legend:

[0021] 100. Cylindrical body; 110. Notch; 120. Cross-section; 121. Convex tooth; 122. Keyway. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0023] Figure 1 A schematic diagram of the overall structure of a plate-type inner liner for plastic pipes is shown. Figure 1The present invention relates to a plate-type inner liner for plastic pipes, comprising a cylindrical body 100 having a notch 110 in the radial direction to form two cross sections 120. The cylindrical body 100 undergoes a diameter change under compression, transitioning from a first state to a second state. In the first state, the outer diameter of the cylindrical body 100 is larger than the inner diameter of the pipe; in the second state, the outer diameter of the cylindrical body 100 is smaller than the inner diameter of the pipe. In other words, the cylindrical body 100 itself is a cylindrical structure with a notch 110. The notch 110 allows the cylindrical body 100 to deform circumferentially under compression, thereby changing its overall diameter. In practical use, the diameter of the cylindrical body 100 in its normal state, i.e., the first state, needs to be larger than the inner diameter of the pipe. Compression of the cylindrical body 100 causes it to change to the second state, i.e., the overall diameter decreases, making its outer diameter smaller than the inner diameter of the pipe, allowing it to be inserted into the pipe. Its own elasticity then helps to support the inner wall of the pipe.

[0024] For example, if the inner diameter of the pipe is 50cm, then the outer diameter of the cylindrical body 100 in the first state must be greater than 50cm, and the outer diameter of the cylindrical body 100 in the second state must be less than 50cm. That is, the outer diameter of the cylindrical body 100 in the first state is 52cm, and the outer diameter in the second state is 48cm. After the cylindrical body 100 is installed in the pipe, it can be reset from the second state to the first state to fit tightly against the inner wall of the pipe and form an adaptive support.

[0025] It should be noted that the cylindrical body 100 itself has self-resetting properties and can be made of metal or plastic.

[0026] Multiple sets of protruding teeth 121 are arranged axially on both cross sections 120, and the protruding teeth 121 on the two cross sections 120 are arranged crosswise to couple in the second state. By using the arrangement of the protruding teeth 121, the cylindrical body 100 can form a closed ring in the second state, which improves the axial deformation resistance of the cylindrical body 100 and avoids the cylindrical body 100 from deforming due to the axial deformation of the pipe.

[0027] In the first state, the protrusions 121 of the two cross sections 120 at least partially overlap in the circumferential direction; that is, in the initial first state, the protrusions 121 on the two cross sections 120 still partially overlap, which can help guide the movement trajectory of the two cross sections 120 to move closer to each other when the cylindrical body 100 undergoes deformation.

[0028] The protruding teeth 121 are evenly spaced on the cross section 120, and a keyway 122 is formed between two adjacent protruding teeth 121. In the second state, the protruding teeth 121 completely fill the keyway 122 to form a smooth curved surface. By matching the protruding teeth 121 on one cross section 120 with the keyway 122 on another cross section 120, a smooth curved surface can be formed in the second state, which is beneficial for resisting deformation in the axial direction.

[0029] As the protruding tooth 121 extends toward the free end, its width gradually decreases to form a tapered guide structure; the free end of the protruding tooth 121 is the insertion end toward the keyway 122, and the decreasing width of the insertion end is used to guide each other.

[0030] Coupling provides guidance.

[0031] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A sheet lining for a plastic pipe, characterised in that: Includes a cylindrical body (100) having a notch (110) in the radial direction to form two cross sections (120). The cylindrical body (100) changes diameter when compressed, and the two cross sections (120) move closer to each other and transition from a first state to a second state. In the first state, the outer diameter of the cylindrical body (100) is larger than the inner diameter of the pipe, and in the second state, the outer diameter of the cylindrical body (100) is smaller than the inner diameter of the pipe.

2. A panel-type lining for plastic pipes according to claim 1, characterized in that: Multiple sets of protruding teeth (121) are arranged axially on both cross sections (120), and the protruding teeth (121) on the two cross sections (120) are arranged crosswise to couple in the second state.

3. A panel-type lining for plastic pipes according to claim 2, characterized in that: In the first state, the protruding teeth (121) of the two cross sections (120) at least partially coincide in the circumferential direction.

4. A panel-type lining for a plastic pipe according to claim 3, characterized in that: The protruding teeth (121) are evenly spaced on the cross section (120), and a keyway (122) is formed between two adjacent protruding teeth (121). In the second state, the protruding teeth (121) completely fill the keyway (122) to form a smooth curved surface.

5. A panel-type lining for plastic pipes according to claim 3, characterized in that: The width of the protruding tooth (121) gradually decreases as it extends toward the free end to form a tapered guide structure.

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