A duplex stainless steel seamless pipe structure

Abstract

The utility model relates to stainless steel pipe technical field discloses a kind of duplex stainless steel seamless steel pipe structures, comprising: pipe body, including outer tube and inner tube, outer tube sleeve joint is located inner tube outside, and coaxial arrangement is formed between outer tube and inner tube compression cavity;Support, fixedly arranged in compression cavity, and there are several around inner tube central axis equidistant distribution in divergent shape;Butt end, including butt outer tube and butt inner tube, butt outer tube and butt inner tube are integrally formed respectively in the both ends of pipe body, and can be screwed sleeve joint;Protective tab, integrally formed on outer tube outer wall, and evenly distributed.The utility model has the advantages of: adding wear-resistant structure, facilitating pipeline butt joint, and the overall compression resistance of pipeline is strong.

Description

Technical Field

[0001] This utility model relates to the field of stainless steel pipe technology, specifically to a duplex stainless steel seamless pipe structure. Background Technology

[0002] Duplex stainless steel pipe is an alloy pipe that combines the properties of austenitic and ferritic stainless steels, with its microstructure consisting of approximately 50% austenite and 50% ferrite. This structure gives it the advantages of both: the good toughness, weldability, and formability of austenitic stainless steel, and the high strength and resistance to chloride stress corrosion of ferritic stainless steel.

[0003] Currently, most mainstream stainless steel pipes adopt a smooth-surfaced pipe design with flanges at both ends as standard interfaces. However, this structure has many limitations in practical applications: the pipe surface is too smooth, making it prone to friction with other components during transportation, installation, and daily maintenance, which can scratch the outer protective coating, affecting not only the appearance but also weakening the pipe's corrosion resistance; the flange connections at both ends require multiple sets of bolts for fastening, which is not only cumbersome and time-consuming in the assembly process but also prone to bolt loosening due to vibration after long-term use, increasing the risk of leakage; in addition, the single-layer pipe structure is slightly insufficient in terms of pressure resistance and overall rigidity under high-pressure conditions, making it difficult to meet the safety requirements of some high-load scenarios. Utility Model Content

[0004] To solve the above-mentioned problems, this utility model proposes a duplex stainless steel seamless pipe structure with added wear-resistant structure, which facilitates pipe connection and enhances the overall pressure resistance of the pipe.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is: a duplex stainless steel seamless pipe structure, comprising:

[0006] The tube body includes an outer tube and an inner tube, wherein the outer tube is sleeved on the outside of the inner tube and is coaxially arranged, and a pressure-resistant cavity is formed between the outer tube and the inner tube;

[0007] Support members are fixedly installed inside the pressure-resistant cavity, and are distributed in a radiating pattern at equal intervals around the central axis of the inner tube;

[0008] The mating end includes an outer mating tube and an inner mating tube, wherein the outer mating tube and the inner mating tube are integrally formed at both ends of the tube body and can be threaded together.

[0009] The protective protrusions are integrally formed on the outer wall of the outer tube and are evenly distributed.

[0010] Furthermore, the outer tube and the inner tube are smoothly connected at their ends to seal the pressure-resistant cavity.

[0011] Furthermore, the support member is arranged perpendicular to the tangent of the inner tube.

[0012] Furthermore, the support member is made of the same duplex stainless steel material as the outer and inner tubes.

[0013] Furthermore, the inner diameter of the outer tube matches the outer diameter of the inner tube, and the inner side of the outer tube and the outer side of the inner tube are respectively provided with mutually compatible threaded protrusions and threaded grooves.

[0014] Furthermore, the protective protrusion is an arc-shaped piece that fits against the outer wall of the outer tube.

[0015] Compared with existing technologies, this invention has the following advantages: By evenly distributing arc-shaped protective protrusions on the outer wall, the design conforms to the curvature of the pipe body without compromising the overall structural integrity, effectively enhancing the outer wall's resistance to impact and wear, providing all-around external force protection for the pipe body, and extending its service life. The integrated mating structure at both ends adopts a threaded connection design; the matching threaded protrusions and grooves make the mating process convenient and efficient. Simultaneously, the threaded connection significantly improves the sealing performance at the connection point, structurally reducing the risk of media leakage. The inner and outer pipes form a closed pressure-resistant cavity, and the diffusely distributed support components within the cavity evenly distribute the pressure. Furthermore, the use of full duplex stainless steel avoids electrochemical corrosion, further strengthening the overall pressure resistance of the pipeline. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is the front view of this utility model;

[0018] Figure 3 This is a side view of the present invention;

[0019] Figure 4 This is a cross-sectional view of the present invention.

[0020] As shown in the figure: 1. Outer tube; 2. Inner tube; 3. Pressure-resistant cavity; 4. Support component; 5. Connecting outer tube; 6. Connecting inner tube; 7. Protective protrusion; 8. Threaded groove. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] Combined with appendix Figure 3 Appendix Figure 4 A duplex stainless steel seamless pipe structure includes: a pipe body, including an outer pipe 1 and an inner pipe 2, wherein the outer pipe 1 is sleeved on the outside of the inner pipe 2 and is coaxially arranged, and a pressure-resistant cavity 3 is formed between the outer pipe 1 and the inner pipe 2. The ends of the outer pipe 1 and the inner pipe 2 are smoothly connected to seal the pressure-resistant cavity 3, which can prevent external impurities from entering the cavity and enhance the sealing performance and structural stability of the pipe body ends.

[0023] Combined with appendix Figure 4 Support members 4 are fixedly installed inside the pressure-resistant cavity 3, and are distributed equidistantly in a divergent pattern around the central axis of the inner tube 2. The support members 4 are perpendicular to the tangent of the inner tube 2, which can more evenly distribute the pressure on the outer tube 1 and the inner tube 2, improving the overall pressure resistance of the pressure-resistant cavity 3. The support members 4 are made of the same duplex stainless steel as the outer tube 1 and the inner tube 2, ensuring the consistency of materials among the components, reducing electrochemical corrosion caused by material differences, and extending the overall service life.

[0024] Combined with appendix Figure 1 Appendix Figure 2 The connecting end includes an outer connecting tube 5 and an inner connecting tube 6. The outer connecting tube 5 and the inner connecting tube 6 are integrally formed at both ends of the tube body and can be threaded together. The inner diameter of the outer connecting tube 5 matches the outer diameter of the inner connecting tube 6. The inner side of the outer connecting tube 5 and the outer side of the inner connecting tube 6 are respectively provided with mutually compatible threaded protrusions and threaded grooves 8, which makes the steel pipe connection more convenient and firm, and at the same time enhances the sealing of the connection and prevents media leakage.

[0025] Combined with appendix Figure 1 Appendix Figure 3 The protective protrusions 7 are integrally formed on the outer wall of the outer tube 1 and are evenly distributed. The protective protrusions 7 are arc-shaped pieces that fit the outer wall of the outer tube 1. They can enhance the impact and wear resistance of the outer wall of the outer tube 1 without affecting the overall structure of the tube, and protect the tube from external damage.

[0026] The specific implementation of this utility model: When using this duplex stainless steel seamless pipe, first check the appearance of the pipe body to ensure that the protective protrusion 7 on the outer wall of the outer pipe 1 is not deformed or damaged, and that the pressure-resistant cavity 3 between the inner pipe 2 and the outer pipe 1 is properly sealed. During installation, align the inner pipe 6 of one steel pipe with the outer pipe 5 of another steel pipe, and use the matching threaded protrusions and threaded grooves 8 to rotate and fit together until the threads are fully engaged, completing the axial connection of the pipes. During the connection process, the integrally formed connection end ensures the connection strength, and the threaded structure effectively prevents the medium from leaking from the interface. After being put into use, the pipe body bears the medium pressure through the double-layer structure of the outer pipe 1 and the inner pipe 2. The support members 4 distributed around the central axis of the inner pipe 2 in the pressure-resistant cavity 3 evenly distribute the pressure to the inner and outer pipe walls, avoiding excessive local stress. When the pipe comes into contact with the ground or is subjected to external impact, the protective protrusion 7 on the outer wall of the outer pipe 1 directly bears the impact force, reducing the wear of the outer pipe 1 body, and the all-duplex stainless steel components reduce the risk of corrosion during long-term use.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; for those skilled in the art, the specific meaning of the above term in this utility model can be understood according to the specific circumstances.

[0028] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A duplex stainless steel seamless pipe structure, characterized in that, include: The tube body includes an outer tube (1) and an inner tube (2). The outer tube (1) is sleeved on the outside of the inner tube (2) and is coaxially arranged. A pressure-resistant cavity (3) is formed between the outer tube (1) and the inner tube (2). Support members (4) are fixedly installed inside the pressure-resistant cavity (3), and are distributed in a radiating pattern at equal intervals around the central axis of the inner tube (2); The docking end includes a docking outer tube (5) and a docking inner tube (6), wherein the docking outer tube (5) and the docking inner tube (6) are integrally formed at both ends of the tube body and can be threaded together; The protective protrusions (7) are integrally formed on the outer wall of the outer tube (1) and are evenly distributed.

2. The duplex stainless steel seamless pipe structure according to claim 1, characterized in that: The outer tube (1) and the inner tube (2) are smoothly connected at their ends to seal the pressure-resistant cavity (3).

3. The duplex stainless steel seamless pipe structure according to claim 1, characterized in that: The support member (4) is set perpendicular to the tangent of the inner tube (2).

4. The duplex stainless steel seamless pipe structure according to claim 1, characterized in that: The support member (4) is made of the same duplex stainless steel material as the outer tube (1) and the inner tube (2).

5. The duplex stainless steel seamless pipe structure according to claim 1, characterized in that: The inner diameter of the outer tube (5) matches the outer diameter of the inner tube (6), and the inner side of the outer tube (5) and the outer side of the inner tube (6) are respectively provided with mutually compatible threaded protrusions and threaded grooves (8).

6. The duplex stainless steel seamless pipe structure according to claim 1, characterized in that: The protective protrusion (7) is an arc-shaped piece that fits the outer wall of the outer tube (1).

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