Highly weatherable multi-coated lined ring composite pipe

Abstract

The utility model relates to a steel pipe technical field especially relates to a kind of high weatherability multi-coat lining ring composite steel pipe, the butt flange is welded and arranged in both ends of the main pipe body, the outer wall of the main pipe body is provided with first outer coating, the outside of the first outer coating is provided with second outer coating, the inner wall of the main pipe body is provided with first inner coating, the outside of the first inner coating is provided with second inner coating, the outside of the second inner coating is provided with third inner coating, the inner wall of the main pipe body is also provided with several stainless steel linings at equal intervals.The utility model passes through inner wall three layers of coating, epoxy primer guarantees and pipe wall adhesion, epoxy ceramic coating is with high hardness and is resistant to medium scouring, polytetrafluoroethylene coating is resistant to strong acid and alkali, can transport hydrochloric acid, strong alkali and other special medium, simultaneously, lining inner triangle reinforcing frame can also disperse pressure, prevent lining deformation to cause anticorrosive coating damage, completely solve the problem that traditional steel pipe inner wall is easily corroded and leaks.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe technology, and in particular to a high weather-resistant multi-coated inner lining composite steel pipe. Background Technology

[0002] In fields such as chemical engineering, municipal water supply and drainage, and outdoor oil and gas transportation, steel pipes have long been used as the mainstream pipelines due to their excellent structural strength. However, traditional steel pipes have significant performance shortcomings in practical applications: on the one hand, when used outdoors, their outer walls are easily affected by ultraviolet radiation, rainwater erosion, and temperature changes, leading to coating aging and peeling, and pipe wall corrosion, resulting in a significant reduction in the service life of the pipeline; on the other hand, when transporting corrosive media such as acid and alkali solutions and sewage, the inner walls are easily corroded, causing the risk of leakage.

[0003] Therefore, there is an urgent need for a composite steel pipe structure that can solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a high weather-resistant multi-coated inner ring composite steel pipe to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A high weather-resistant multi-coated inner-lined composite steel pipe includes a main body, with butt flanges welded to both ends of the main body. The outer wall of the main body is provided with a first outer coating, and a second outer coating is provided outside the first outer coating. The inner wall of the main body is provided with a first inner coating, a second inner coating is provided outside the first inner coating, and a third inner coating is provided outside the second inner coating. Several stainless steel inner liners are also provided at equal intervals on the inner wall of the main body.

[0006] As a preferred embodiment of this invention, the first outer coating is a fluorocarbon primer, and the second outer coating is polyvinylidene fluoride.

[0007] As a preferred embodiment of the present invention, the first inner coating is an epoxy primer, the second inner coating is an epoxy ceramic coating, and the third inner coating is a polytetrafluoroethylene coating.

[0008] As a preferred embodiment of the present invention, the outer wall of the main tube is provided with a spiral reinforcing rib, and the outer wall of the spiral reinforcing rib is provided with a first outer coating and a second outer coating.

[0009] As a preferred embodiment of this utility model, a triangular reinforcing frame is provided inside the stainless steel liner, and the surfaces of the stainless steel liner and the triangular reinforcing frame are provided with a first inner coating, a second inner coating, and a third inner coating.

[0010] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects: 1. This utility model uses a three-layer coating on the inner wall: an epoxy primer to ensure adhesion to the pipe wall, an epoxy ceramic coating to resist media erosion with high hardness, and a polytetrafluoroethylene coating to resist strong acids and alkalis, which can transport special media such as hydrochloric acid and strong alkalis. At the same time, the triangular reinforcement frame inside the lining can also disperse pressure and prevent the lining from deforming and causing damage to the anti-corrosion layer, thus completely solving the problems of easy corrosion and leakage of the inner wall of traditional steel pipes.

[0011] 2. This utility model features a double-layer coating design on the outer wall. The fluorocarbon primer isolates oxygen and water vapor, while the polyvinylidene fluoride coating is resistant to ultraviolet rays, high and low temperatures, and can withstand outdoor sun exposure, rain, and freeze-thaw cycles, preventing the outer wall from rusting and the coating from cracking. Furthermore, the spiral reinforcing rib outer wall is coated simultaneously with the main pipe, leaving no blind spots in protection. This ensures that the pipeline can maintain stable weather resistance in outdoor scenarios such as municipal open-air pipe networks, significantly extending its outdoor service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic cross-sectional view of one end of the main body of this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of section B in the middle.

[0013] Reference numerals: 1. Main body; 2. Connecting flange; 3. First outer coating; 4. Second outer coating; 5. First inner coating; 6. Second inner coating; 7. Third inner coating; 8. Spiral reinforcing rib; 9. Stainless steel liner; 10. Triangular reinforcing frame. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0015] like Figures 1-4As shown, the present invention proposes a high weather-resistant multi-coated inner ring composite steel pipe, including a main body 1. Both ends of the main body 1 are fixedly provided with butt flanges 2 by welding. In order to improve the UV resistance, aging resistance and corrosion resistance of the main body 1, a first outer coating 3 is first sprayed on the outer wall of the main body 1. This coating is made of fluorocarbon primer, which plays a basic role in corrosion protection and adhesion enhancement. On the outside of the first outer coating 3, a second outer coating 4 is coated. The material is polyvinylidene fluoride, which utilizes its excellent weather resistance and chemical stability to further isolate the external environment from corrosion. To enhance the bending and impact resistance of the main body 1, a spiral reinforcing rib 8 is integrally formed on the outer wall of the main body 1. The outer wall of the spiral reinforcing rib 8 and the other outer walls of the main body 1 are simultaneously sprayed with the first outer coating 3 and the second outer coating 4 to ensure consistent overall anti-corrosion performance and no blind spots in protection. The inner wall of the main body 1 adopts a three-layer coating design to achieve efficient corrosion protection: the first layer is the first inner coating 5, which uses epoxy primer to improve adhesion to the pipe wall; the second layer is the second inner coating 6, which is an epoxy ceramic coating, which uses its high hardness to resist the erosion of the medium; the third layer is the third inner coating 7, which is made of polytetrafluoroethylene and has extremely strong chemical corrosion resistance, making it suitable for special conveying media such as acids and alkalis. To further enhance the stability and deformation resistance of the inner wall structure, several stainless steel liners 9 are welded at equal intervals along the axial direction on the inner wall of the main pipe 1. At the same time, a triangular reinforcing frame 10 is welded and fixed inside each stainless steel liner 9. The stability of the triangular structure effectively disperses the pressure of the medium inside the pipe and prevents the liner from deforming.

[0016] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A high weather-resistant multi-coated inner ring composite steel pipe, comprising a main body (1), wherein both ends of the main body (1) are welded with butt flanges (2), characterized in that: The outer wall of the main body (1) is provided with a first outer coating (3), the outer side of the first outer coating (3) is provided with a second outer coating (4), the inner wall of the main body (1) is provided with a first inner coating (5), the outer side of the first inner coating (5) is provided with a second inner coating (6), the outer side of the second inner coating (6) is provided with a third inner coating (7), and several stainless steel liners (9) are also provided at equal intervals on the inner wall of the main body (1).

2. The high weather-resistant multi-coated inner ring composite steel pipe according to claim 1, characterized in that: The first outer coating (3) is a fluorocarbon primer, and the second outer coating (4) is polyvinylidene fluoride.

3. The high weather-resistant multi-coated inner ring composite steel pipe according to claim 1, characterized in that: The first inner coating (5) is an epoxy primer, the second inner coating (6) is an epoxy ceramic coating, and the third inner coating (7) is a polytetrafluoroethylene coating.

4. The high weather-resistant multi-coated inner ring composite steel pipe according to claim 1, characterized in that: The outer wall of the main body (1) is provided with a spiral reinforcing rib (8), and the outer wall of the spiral reinforcing rib (8) is provided with a first outer coating (3) and a second outer coating (4).

5. The high weather-resistant multi-coated inner ring composite steel pipe according to claim 1, characterized in that: The stainless steel liner (9) is provided with a triangular reinforcing frame (10), and the surfaces of the stainless steel liner (9) and the triangular reinforcing frame (10) are provided with a first inner coating (5), a second inner coating (6) and a third inner coating (7).

Images