High-strength plastic-lined steel pipe

Abstract

The utility model belongs to the technical field of plastic-lined steel pipes, and discloses a high-strength plastic-lined steel pipe which comprises a first pipeline and a second pipeline, a first flange and a second flange are arranged on the peripheries of the two ends of the first pipeline and the second pipeline respectively, steel pipes are arranged in the first pipeline and the second pipeline respectively, and plastic pipes are arranged in the steel pipes. A cavity is formed between the plastic pipe and the steel pipe, a plurality of V-shaped plates are arranged in the cavity, V-shaped elastic pieces are fixedly embedded in the V-shaped plates, and the V-shaped plates with the V-shaped elastic pieces are arranged in the cavity between the steel pipe and the plastic pipe, so that when the plastic pipe deforms, the cavity can provide a certain deformation space for the plastic pipe; and under the action of the V-shaped plate and the V-shaped elastic piece in the V-shaped plate, stress generated when the plastic pipe deforms is counteracted, so that the purpose of relieving deformation of the plastic pipe is achieved, the deformation degree of the plastic pipe is reduced, and the effect of improving the strength of the plastic-lined steel pipe is achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of plastic-lined steel pipes, specifically relating to a high-strength plastic-lined steel pipe. Background Technology

[0002] Plastic-lined composite steel pipes are manufactured using a tight-lining composite process, where a plastic base is placed inside the steel pipe. This isolates the transported medium from the external environment, preventing corrosion and extending the pipe's service life. Galvanized seamless steel pipes or welded steel pipes are used as the base pipe. After removing the weld reinforcement from the inner wall, a food-grade polyethylene (PE) lining of the same diameter as the galvanized pipe is inserted. The polyethylene lining thickness must meet the CJ / T136-2007 standard. Finally, the pipe is pressurized and heated for a certain period to form the final product. This is an upgraded version of traditional galvanized pipes.

[0003] Currently, existing plastic-lined steel pipes, when transporting fluid media, are prone to separation of the plastic and steel pipes due to the different deformation of the plastic and steel pipes. This can occur after prolonged use, especially under conditions of excessive flow rate, excessive pressure, or high temperature, severely affecting the service life of the plastic-lined steel pipes. To address this, we propose a high-strength plastic-lined steel pipe. Utility Model Content

[0004] The purpose of this utility model is to provide a high-strength plastic-lined steel pipe to solve the existing problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-strength plastic-lined steel pipe, comprising a first pipe, a second pipe, a cavity, and V-shaped plates. A first flange and a second flange are respectively provided on the outer periphery of both ends of the first and second pipes. A steel pipe is installed inside both the first and second pipes, and a plastic pipe is installed inside the steel pipe. A cavity with a certain distance is maintained between the plastic pipe and the steel pipe. Several V-shaped plates are installed inside the cavity. One end of the middle of each V-shaped plate is fixedly connected to the inner wall of the steel pipe, and both ends of the V-shaped plate are fixedly connected to the outer wall of the plastic pipe. The V-shaped plates are arranged around the plastic pipe, and V-shaped spring pieces are fixedly embedded inside the V-shaped plates.

[0006] Preferably, both ends of the first pipe and the second pipe are respectively provided with a first concave-convex sealing gasket and a second concave-convex sealing gasket, and the grooves and protrusions on the first concave-convex sealing gasket and the second concave-convex sealing gasket are staggered with each other.

[0007] Preferably, both the first pipe and the second pipe have rubber protrusions at one end in the same direction, and the rubber protrusions on the second pipe extend into the interior of the end of the first pipe without rubber protrusions and are in close contact with its inner wall.

[0008] Preferably, the steel pipe is provided with an insulation layer on its outer periphery, the insulation layer covers the outer wall of the steel pipe, and the insulation layer is covered with a waterproof layer.

[0009] Preferably, the outer surface of the waterproof layer is provided with a zinc-plated coating, which covers the outer peripheral surface of the waterproof layer.

[0010] Preferably, the outer periphery of the first flange and the second flange are respectively provided with bolts and threaded holes, and the first flange and the second flange are fixedly connected by the provided bolts, threaded holes and nuts.

[0011] Preferably, the inner wall of the plastic tube is provided with an anti-corrosion coating, which uniformly covers the inner wall surface of the plastic tube.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By installing a V-shaped plate with V-shaped springs inside the cavity between the steel pipe and the plastic pipe, the cavity can provide a certain deformation space for the plastic pipe when it deforms. Under the action of the V-shaped plate and the V-shaped springs inside, the stress generated when the plastic pipe deforms is offset, thereby reducing the deformation of the plastic pipe, reducing the degree of deformation, and improving the strength of the plastic-lined steel pipe.

[0014] 2. By setting a first convex-concave sealing gasket and a second convex-concave sealing gasket at both ends of the first pipe and the second pipe respectively, the staggered arrangement of the first convex-concave sealing gasket and the second convex-concave sealing gasket achieves the effect of staggered sealing. In conjunction with the rubber convex tube, it can adhere to the inner wall of the plastic pipe when subjected to fluid pressure. As the fluid pressure increases, the tightness of the fit between the plastic pipe and the rubber convex tube is improved, thereby achieving a highly efficient sealing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a multi-angle structural schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the first pipe of this utility model;

[0018] Figure 4 For the present utility model Figure 3 A schematic diagram of the enlarged structure of A in the middle.

[0019] In the diagram: 1. First pipe; 2. First flange; 3. Bolt; 4. First convex-concave gasket; 5. Plastic pipe; 6. Second pipe; 7. Second flange; 8. Bolt hole; 9. Second convex-concave gasket; 10. Rubber convex tube; 11. Galvanized coating; 12. Waterproof layer; 13. Insulation layer; 14. Steel pipe; 15. Cavity; 16. V-shaped plate; 17. V-shaped spring; 18. Anti-corrosion coating. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This utility model provides a high-strength plastic-lined steel pipe technical solution: including a first pipe 1, a second pipe 6, a cavity 15, and V-shaped plates 16. The outer periphery of both ends of the first pipe 1 and the second pipe 6 are respectively provided with a first flange 2 and a second flange 7. The inside of the first pipe 1 and the second pipe 6 is provided with a steel pipe 14. The inside of the steel pipe 14 is provided with a plastic pipe 5. A cavity 15 with a certain distance is maintained between the plastic pipe 5 and the steel pipe 14. Several V-shaped plates 16 are provided inside the cavity 15. One end of the middle of the V-shaped plate 16 is fixedly connected to the inner wall of the steel pipe 14, and both ends of the V-shaped plate 16 are fixedly connected to the outer wall of the plastic pipe 5. The V-shaped plate 16 is arranged around the plastic pipe 5. V-shaped spring pieces 17 are fixedly embedded inside the V-shaped plate 16.

[0022] Specifically, both ends of the first pipe 1 and the second pipe 6 are respectively provided with a first concave-convex sealing gasket 4 and a second concave-convex sealing gasket 9, and the grooves and protrusions on the first concave-convex sealing gasket 4 and the second concave-convex sealing gasket 9 are staggered with each other.

[0023] Specifically, both the first pipe 1 and the second pipe 6 have rubber protrusions 10 at one end in the same direction. The rubber protrusions 10 on the second pipe 6 extend into the interior of the end of the first pipe 1 that does not have rubber protrusions 10 and are in close contact with its inner wall.

[0024] Specifically, an insulation layer 13 is provided around the outer periphery of the steel pipe 14, the insulation layer 13 covers the outer wall of the steel pipe 14, and a waterproof layer 12 is provided on the outside of the insulation layer 13.

[0025] Specifically, the outer surface of the waterproof layer 12 is provided with a galvanized coating 11, which covers the outer peripheral surface of the waterproof layer 12.

[0026] Specifically, bolts 3 and screw holes 8 are respectively provided on the outer periphery of the first flange 2 and the second flange 7, and the first flange 2 and the second flange 7 are fixedly connected by the provided bolts 3, screw holes 8 and nuts.

[0027] Specifically, the inner wall of the plastic pipe 5 is provided with an anti-corrosion coating 18, which is uniformly covered on the inner wall surface of the plastic pipe 5.

[0028] In this embodiment, during use, the first flange 2 and the second flange 7 are installed and fixed using bolts 3, threaded holes 8, and nuts, allowing the first pipe 1 and the second pipe 6 to connect. The first and second convex-concave sealing gaskets 4 and 9, located at the connection end of the first pipe 1 and the second pipe 6, are staggered, allowing them to interlock and achieve a highly efficient seal. Furthermore, a rubber convex tube 10 extending from the second pipe 6 into the interior of the first pipe 1 allows the pressure generated during fluid flow to pressurize the rubber convex tube 10, enabling it to... The plastic pipe 5 is tightly fitted to the inner wall, thereby improving the sealing effect. The greater the pressure, the better the sealing performance. By setting a cavity 15 with a certain distance between the steel pipe 14 and the plastic pipe 5, and setting a V-shaped plate 16 with a V-shaped spring 17 inside the cavity 15, the cavity 15 can provide a certain deformation space for the plastic pipe 5 when it deforms. Under the action of the V-shaped plate 16 and the V-shaped spring 17 inside, the stress generated when the plastic pipe 5 deforms is offset, thereby reducing the deformation of the plastic pipe 5, reducing the degree of deformation of the plastic pipe 5, and improving the strength of the plastic-lined steel pipe.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength plastic-lined steel pipe, comprising a first pipe (1), a second pipe (6), a cavity (15), and a V-shaped plate (16), characterized in that: Both ends of the first pipe (1) and the second pipe (6) are respectively provided with a first flange (2) and a second flange (7). Both the first pipe (1) and the second pipe (6) are provided with a steel pipe (14). A plastic pipe (5) is provided inside the steel pipe (14). A cavity (15) with a certain distance is maintained between the plastic pipe (5) and the steel pipe (14). Several V-shaped plates (16) are provided inside the cavity (15). One end of the middle part of the V-shaped plate (16) is fixedly connected to the inner wall of the steel pipe (14). Both ends of the V-shaped plate (16) are fixedly connected to the outer wall of the plastic pipe (5). The V-shaped plate (16) is arranged around the plastic pipe (5). A V-shaped spring piece (17) is fixedly embedded inside the V-shaped plate (16).

2. The high-strength plastic-lined steel pipe according to claim 1, characterized in that: Both ends of the first pipe (1) and the second pipe (6) are respectively provided with a first concave-convex sealing gasket (4) and a second concave-convex sealing gasket (9), and the grooves and protrusions on the first concave-convex sealing gasket (4) and the second concave-convex sealing gasket (9) are staggered.

3. The high-strength plastic-lined steel pipe according to claim 1, characterized in that: Both the first pipe (1) and the second pipe (6) have rubber protrusions (10) at one end in the same direction. The rubber protrusions (10) on the second pipe (6) extend into the interior of the end of the first pipe (1) that does not have rubber protrusions (10) and are in close contact with its inner wall.

4. A high-strength plastic-lined steel pipe according to claim 1, characterized in that: The steel pipe (14) is provided with an insulation layer (13) on its outer periphery. The insulation layer (13) covers the outer wall of the steel pipe (14), and the insulation layer (13) is covered with a waterproof layer (12).

5. A high-strength plastic-lined steel pipe according to claim 4, characterized in that: The outer surface of the waterproof layer (12) is provided with a zinc coating (11), which covers the outer peripheral surface of the waterproof layer (12).

6. A high-strength plastic-lined steel pipe according to claim 1, characterized in that: The outer periphery of the first flange (2) and the second flange (7) are respectively provided with bolts (3) and screw holes (8), and the first flange (2) and the second flange (7) are fixedly connected by the provided bolts (3), screw holes (8) and nuts.

7. A high-strength plastic-lined steel pipe according to claim 1, characterized in that: The inner wall of the plastic tube (5) is provided with an anti-corrosion coating (18), which uniformly covers the inner wall surface of the plastic tube (5).

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