A corrosion and high temperature resistant steel lined PFA pipe

Abstract

The utility model discloses a kind of corrosion-resistant, high-temperature-resistant steel lining PFA pipelines, including outer tube, steel skeleton and anticorrosion inner lining.The corrosion-resistant, high-temperature-resistant steel lining PFA pipeline in anticorrosion inner lining adopts PFA plastic, its material property gives anticorrosion inner lining excellent corrosion resistance and high-temperature resistance, anticorrosion inner lining covers the inner wall of outer tube, and is wrapped positioning structure, steel skeleton and two limit rings, so that anticorrosion inner lining can play the role of chemical erosion protection and high-temperature protection to outer tube, steel skeleton, limit ring and positioning structure;Utilize steel skeleton to be able to improve the structural strength of anticorrosion inner lining and outer tube, compared with the corrosion-resistant pipeline of traditional steel pipe and lining combination, the structural strength of the utility model is higher, can bear stronger pressure, and the deformation damage probability of anticorrosion inner lining and outer tube is lower;Limit ring plays axial positioning role to steel skeleton, and positioning structure can be cooperated to prevent steel skeleton and anticorrosion inner lining displacement.

Description

Technical Field

[0001] This utility model relates to a pipeline, and more particularly to a corrosion-resistant and high-temperature-resistant steel-lined PFA pipeline. Background Technology

[0002] Pipelines used in the chemical industry need to operate in high-temperature, high-pressure, and highly corrosive environments. Prolonged use may lead to damage due to various reasons, such as corrosion, wear, internal pressure, or environmental factors. Existing technologies include pipelines with anti-corrosion linings. These pipelines typically have the lining glued or directly hot-pressed onto the inner wall of the steel pipe. They have good anti-corrosion and high-temperature resistance, but under high pressure conditions, the lining is very susceptible to peeling off from the inner wall of the steel pipe and deformation damage. Utility Model Content

[0003] Purpose of the utility model: To provide a corrosion-resistant and high-temperature resistant steel-lined PFA pipe, wherein the anti-corrosion inner lining 9 has higher structural strength, can withstand stronger pressure, and is not easily peeled off.

[0004] Technical solution: The corrosion-resistant and high-temperature resistant steel-lined PFA pipe provided by this utility model includes an outer pipe, a steel frame, and an anti-corrosion lining; several positioning holes are provided on the steel frame; the steel frame is coaxially installed inside the outer pipe through a positioning structure, and there is a gap between the steel frame and the inner wall of the outer pipe; limit rings are fixed at both ends of the inner wall of the outer pipe; the two ends of the steel frame are pressed against the opposite sides of the two limit rings; the anti-corrosion lining covers the inner wall of the outer pipe; the anti-corrosion lining wraps the positioning structure, the steel frame, and the two limit rings, and fills the gap between the steel frame and the outer pipe.

[0005] Furthermore, the positioning structure includes multiple limiting strips and several snap-fit ​​strips; the end face of the limiting strip is L-shaped; one long side of the limiting strip is a straight side, and the other long side is a wavy side; the straight sides of each limiting strip are fixed to the inner wall of the outer tube at intervals, and the length direction of the limiting strip is parallel to the axis of the outer tube; one edge of each snap-fit ​​strip is integrally fixed to one side of the positioning hole wall, and the other side is used for bending and snap-fitting to the wavy side of the adjacent limiting strip.

[0006] Furthermore, the wavy long sides of the adjacent limiting strips face in opposite directions.

[0007] Furthermore, both ends of the outer pipe are fitted with connecting flanges; both ends of the corrosion-resistant inner lining are integrally fitted with limiting flanges; the two limiting flanges are pressed onto the opposite sides of the two connecting flanges respectively.

[0008] Compared with the prior art, the advantages of this utility model are as follows: The anti-corrosion lining is made of PFA plastic, which is fusible polytetrafluoroethylene. Its material properties give the anti-corrosion lining excellent corrosion resistance and high temperature resistance. The anti-corrosion lining covers the inner wall of the outer pipe and wraps the positioning structure, steel frame, and two limiting rings, so that the anti-corrosion lining can play a role in chemical corrosion protection and high temperature protection for the outer pipe, steel frame, limiting rings, and positioning structure. The steel frame can improve the structural strength of the anti-corrosion lining and the outer pipe. Compared with the traditional anti-corrosion pipe with steel pipe and lining combination, the structure of this utility model has higher structural strength, can withstand stronger pressure, and has a lower probability of deformation and breakage of the anti-corrosion lining and the outer pipe, and is not easy to be peeled off from the inner wall of the outer pipe. The limiting rings play an axial positioning role for the steel frame, and together with the positioning structure, can prevent the steel frame and the anti-corrosion lining from shifting. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a partial cross-sectional view of the present invention;

[0011] Figure 3 This is a partially enlarged view of the present invention;

[0012] In the diagram: 1. Outer tube; 2. Steel frame; 3. Limiting ring; 4. Connecting flange; 5. Limiting flange; 6. Positioning hole; 7. Clip strip; 8. Limiting strip; 9. Corrosion-resistant lining. Detailed Implementation

[0013] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0014] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0015] In the description of this utility model, it should be understood that the terms "left", "right", "front", "back", "up", "down", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] Example 1:

[0017] like Figure 1-3 As shown, the present invention provides a corrosion-resistant and high-temperature resistant steel-lined PFA pipe comprising: an outer pipe 1, a steel frame 2, and an anti-corrosion inner lining 9; a plurality of positioning holes 6 are provided on the steel frame 2; the steel frame 2 is coaxially installed inside the outer pipe 1 through a positioning structure, and there is a gap between the steel frame 2 and the inner wall of the outer pipe 1; limit rings 3 are fixed at both ends of the inner wall of the outer pipe 1; the two ends of the steel frame 2 are respectively pressed against the opposite sides of the two limit rings 3; the anti-corrosion inner lining 9 covers the inner wall of the outer pipe 1; the anti-corrosion inner lining 9 wraps the positioning structure, the steel frame 2, and the two limit rings 3, and fills the gap between the steel frame 2 and the outer pipe 1.

[0018] The anti-corrosion liner 9 is made of PFA plastic, which is fusible polytetrafluoroethylene. Its material properties give the anti-corrosion liner 9 excellent corrosion resistance and high temperature resistance. The anti-corrosion liner 9 covers the inner wall of the outer pipe and wraps the positioning structure, steel frame 2, and two limiting rings 3, so that the anti-corrosion liner 9 can provide chemical corrosion protection and high temperature protection for the outer pipe 1, steel frame 2, limiting rings 3, and positioning structure. The steel frame 2 can improve the structural strength of the anti-corrosion liner 9 and the outer pipe 1. Compared with the traditional anti-corrosion pipe with steel pipe and liner combination, the structure of this utility model has higher structural strength, can withstand stronger pressure, and has a lower probability of deformation and breakage of the anti-corrosion liner 9 and the outer pipe 1, and is not easy to be peeled off from the inner wall of the outer pipe 1. After the steel frame 2 is installed, two limiting rings 3 are welded so that the two limiting rings 3 are pressed tightly on both ends of the steel frame 2. The limiting rings 3 provide axial positioning for the steel frame, and together with the positioning structure, can prevent the steel frame 2 and the anti-corrosion liner 9 from shifting.

[0019] Furthermore, the positioning structure includes multiple limiting strips 8 and several snap-fit ​​strips 7; the end face of the limiting strip 8 is L-shaped; one long side of the limiting strip 8 is a straight side, and the other long side is a wavy side; the straight sides of each limiting strip 8 are fixed to the inner wall of the outer tube 1 at intervals, and the length direction of the limiting strip 8 is parallel to the axis of the outer tube 1; one edge of each snap-fit ​​strip 7 is integrally fixed to one side of the hole wall of each positioning hole 6, and the other side is used for bending and snap-fit ​​fixing to the wavy side of the adjacent limiting strip 8.

[0020] The wavy long side of the limiting strip 8 and the positioning hole 6 facilitate the welding and fixing of the buckle strip 7 after bending and buckling, thereby achieving the positioning and installation of the steel frame 2. At the same time, the L-shaped structure of the limiting strip 8, together with the buckle strip 7, can play a structural strengthening role for the steel frame 2. When the negative pressure in the pipeline is large, it provides resistance to the steel frame 2, reducing the possibility of deformation of the steel frame 2 and damage to the anti-corrosion lining 9.

[0021] Furthermore, the number of limiting strips 8 is even, and the wavy long sides of adjacent limiting strips 8 face opposite directions. By utilizing the opposite orientation of the wavy long sides of adjacent limiting strips 8, each snap-on strip 7 snaps onto the wavy long side of the limiting strip 8, thus providing axial positioning for the steel frame 2. On the basis of welding fixation, this further prevents the steel frame 2 and the anti-corrosion lining 9 from shifting.

[0022] Furthermore, both ends of the outer pipe 1 are equipped with connecting flanges 4; both ends of the anti-corrosion lining 9 are integrally equipped with limiting flanges 5; the two limiting flanges 5 are pressed against the opposite sides of the two connecting flanges 4. The connecting flanges 4 serve to position the pipes for connection; the limiting flanges 5 serve to seal the pipes. When the two pipes are connected, the two limiting flanges 5 are pressed tightly against the connecting flanges 4, achieving a good sealing effect.

[0023] In the corrosion-resistant and high-temperature resistant steel-lined PFA pipe provided by this utility model, the anti-corrosion lining 9 is made of PFA plastic.

[0024] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A corrosion-resistant and high-temperature-resistant steel-lined PFA pipe, characterized in that: It includes an outer tube (1), a steel frame (2), and an anti-corrosion liner (9); several positioning holes (6) are provided on the steel frame (2); the steel frame (2) is coaxially installed inside the outer tube (1) through a positioning structure; limit rings (3) are fixed at both ends of the outer tube (1); the steel frame (2) is located between the two limit rings (3); the anti-corrosion liner (9) covers the inner wall of the outer tube (1) and wraps the positioning structure, the steel frame (2), and the two limit rings (3).

2. The corrosion-resistant and high-temperature-resistant steel-lined PFA pipe according to claim 1, characterized in that: The positioning structure includes multiple limiting strips (8) and several snap-fit ​​strips (7); one long side of the limiting strip (8) is wavy; the other long side of each limiting strip (8) is fixed at intervals on the inner wall of the outer tube (1) and parallel to the axis of the outer tube (1); each snap-fit ​​strip (7) is integrally fixed on the hole wall of each positioning hole (6), and the edge is used to be bent and snapped on the wavy long side of the corresponding limiting strip (8).

3. The corrosion-resistant and high-temperature-resistant steel-lined PFA pipe according to claim 2, characterized in that: The wavy long sides of adjacent limit bars (8) face opposite directions.

4. The corrosion-resistant and high-temperature-resistant steel-lined PFA pipe according to claim 1, characterized in that: A connecting flange (4) is provided at both ends of the outer tube (1); a limiting flange (5) is integrally provided at both ends of the anti-corrosion lining (9) and pressed onto the corresponding side connecting flange (4).

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