High-temperature-resistant and corrosion-resistant composite seamless stainless steel pipe

Abstract

This application relates to a high-temperature and corrosion-resistant composite seamless stainless steel pipe, comprising a steel pipe body. The steel pipe body includes an inner pipe and an outer pipe connected by an installation structure. The installation structure includes a mounting seat fixed to the inner pipe and a fixing plate fixed to the inner sidewall of the outer pipe. The fixing plate is inserted into the mounting seat, and when the outer pipe rotates, the fixing plate is housed and positioned in the mounting seat. This application achieves a detachable connection between the inner and outer pipes through the cooperation between the fixing plate of the outer pipe and the mounting seat of the inner pipe. This improves the thermal expansion and contraction resistance of the seamless stainless steel pipe and makes the replacement of the double-layer composite seamless stainless steel pipe more convenient.

Description

Technical Field

[0001] This application relates to the technical field of seamless stainless steel pipes, and in particular to high-temperature resistant and corrosion-resistant composite seamless stainless steel pipes. Background Technology

[0002] Seamless stainless steel pipes are widely used in domestic and international industries such as petroleum, chemical, pharmaceutical, papermaking, shipbuilding, food, nuclear power, military, machinery, environmental protection, and automobile manufacturing due to their characteristics of no weld seams, good integrity, strong pressure bearing capacity, and excellent corrosion resistance.

[0003] Currently, seamless stainless steel pipes used for transporting high-temperature steam are often double-layered stainless steel pipes bonded together with welded fixing frames to prevent thermal expansion and contraction. However, if the inner and outer steel pipes are damaged after prolonged use, the welded fixing frames between the inner and outer layers need to be cut off and replaced, which is a rather cumbersome process. Utility Model Content

[0004] To facilitate the replacement of double-layer composite seamless stainless steel pipes, this application provides a high-temperature and corrosion-resistant composite seamless stainless steel pipe.

[0005] The high-temperature and corrosion-resistant composite seamless stainless steel pipe provided in this application adopts the following technical solution: High-temperature and corrosion-resistant composite seamless stainless steel pipe includes a steel pipe body. The steel pipe body includes an inner pipe body and an outer pipe body connected by an installation structure. The installation structure includes a mounting seat fixed to the inner pipe body and a fixing plate fixed to the inner side wall of the outer pipe body. The fixing plate is inserted into the mounting seat, and when the outer pipe body rotates, the fixing plate is accommodated and positioned in the mounting seat.

[0006] By adopting the above technical solution, the fixing plate of the outer tube body and the mounting seat of the inner tube body cooperate with each other to realize the detachable connection between the inner tube body and the outer tube body. This can improve the thermal expansion and contraction resistance of the seamless stainless steel tube and make the replacement of the double-layer composite seamless stainless steel tube more convenient.

[0007] Preferably, the installation structure further includes a limiting plate, and the mounting base has an insertion groove, and one side of the insertion groove is connected to a fixing groove for accommodating the fixing plate. After the fixing plate is inserted into the insertion groove, it enters the fixing groove. When the fixing plate is accommodated in the fixing groove, the limiting plate is inserted into the insertion groove and abuts against the fixing plate.

[0008] By adopting the above technical solution, the insertion slot and the fixing slot are connected, so that the fixing plate is horizontally inserted into the mounting base from the insertion slot and positioned in the fixing slot as the outer tube rotates. Furthermore, by inserting a limiting plate, the fixing plate cannot be removed from the fixing slot, thus realizing convenient positioning of the inner tube and the outer tube, improving the thermal expansion and contraction resistance of the seamless stainless steel pipe and facilitating disassembly and assembly.

[0009] Preferably, the installation structure further includes a positioning ring, and a limiting plate is fixed to the side wall of the positioning ring; the end of the outer tube extends out of the inner tube to form a receiving cavity, and the positioning ring is received in the receiving cavity.

[0010] By adopting the above technical solution, the positioning ring can support several limiting plates, realizing the synchronous limiting of the fixing plates at multiple points; the positioning ring is housed in the accommodating cavity formed between the outer tube and the inner tube, avoiding protrusion outside the outer tube, and also improving the installation stability of the positioning ring.

[0011] Preferably, the positioning rings are disposed opposite to each other at both ends of the inner tube, and the positioning rings are installed in the corresponding receiving cavities through a positioning structure.

[0012] By adopting the above technical solution, the corresponding positioning rings are respectively installed at both ends of the inner tube body, so that the fixing plate can be positioned from both ends of the steel pipe body, making the operation more convenient; the positioning structure allows the limiting plate to accurately correspond to the insertion slot when the positioning ring is placed in the receiving cavity, reducing the difficulty of operation.

[0013] Preferably, the positioning structure includes a positioning plate and a positioning groove. The positioning plate is fixed at intervals to the circumferential sidewall of the positioning ring, and the positioning groove is opened on the sidewall of the outer tube body to accommodate and position the positioning plate.

[0014] By adopting the above technical solution, the positioning plate and the positioning groove cooperate to limit the installation of the positioning ring in the accommodating cavity, so that the limiting plate can be accurately inserted into the insertion groove.

[0015] Preferably, the positioning ring is fixed to the end of the inner tube by spaced positioning bolts.

[0016] By adopting the above technical solution, the installation stability of the positioning ring at the end of the inner tube is improved by using positioning bolts.

[0017] Preferably, the outer tube and the inner tube are made of low alloy heat-resistant steel, and the inner wall of the inner tube is provided with a graphite layer.

[0018] By adopting the above technical solutions, low-alloy heat-resistant steel has high high-temperature resistance, the graphite layer has high-temperature and high-pressure resistance, is not easy to fall off, has strong corrosion resistance, and has a long service life.

[0019] In summary, this application includes at least one of the following beneficial technical effects: The fixing plate of the outer tube body and the mounting seat of the inner tube body cooperate with each other to realize the detachable connection between the inner tube body and the outer tube body. This can improve the thermal expansion and contraction resistance of the seamless stainless steel tube and make the replacement of the double-layer composite seamless stainless steel tube more convenient. The insertion slot is connected to the fixing slot, so that the fixing plate is horizontally inserted into the mounting base from the insertion slot and positioned in the fixing slot as the outer tube rotates. Furthermore, by inserting a limiting plate, the fixing plate cannot be removed from the fixing slot, thus realizing convenient positioning of the inner and outer tubes, improving the thermal expansion and contraction resistance of the seamless stainless steel tube and facilitating disassembly and assembly. The positioning ring can support several limiting plates, enabling synchronous positioning of the fixing plates at multiple points. The positioning ring is housed in the cavity formed between the extended outer tube and the inner tube, preventing it from protruding from the outer tube. The positioning ring is positioned in the cavity by the cooperation of the positioning plate and the positioning groove, allowing the limiting plate to be accurately inserted into the insertion groove and improving the installation stability of the positioning ring. Attached Figure Description

[0020] Figure 1 This is an exploded structural diagram of the positioning ring connected to the steel pipe body according to an embodiment of this application; Figure 2 This is a partial structural schematic diagram of the outer tube and fixing plate according to an embodiment of this application; Figure 3 This is a cross-sectional structural diagram of the connection between the inner and outer tubes and the positioning plate abutting against the fixing plate in an embodiment of this application. Figure 4 This is a partial structural diagram of the positioning ring and limiting plate inserted into the inner tube body according to an embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Steel pipe body; 11. Inner pipe body; 12. Outer pipe body; 2. Installation structure; 21. Mounting base; 211. Insertion groove; 212. Fixing groove; 22. Fixing plate; 23. Positioning ring; 24. Limiting plate; 3. Positioning structure; 31. Positioning plate; 32. Positioning groove; 4. Positioning bolt; 5. Accommodating cavity. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the accompanying drawings.

[0023] This application discloses a high-temperature resistant and corrosion-resistant composite seamless stainless steel pipe, see reference... Figure 1 The system includes a steel pipe body 1, which includes an inner pipe body 11 and an outer pipe body 12. The outer pipe body 12 and the inner pipe body 11 are made of low-alloy heat-resistant steel. The inner wall of the inner pipe body 11 is provided with a graphite layer. The low-alloy heat-resistant steel has high high-temperature resistance, and the graphite layer has high-temperature and high-pressure resistance, is not easy to fall off, and has strong corrosion resistance and a long service life.

[0024] Reference Figure 1The inner tube 11 and the outer tube 12 are connected by the installation structure 2, which realizes the detachable connection between the inner tube 11 and the outer tube 12. This can improve the thermal expansion and contraction resistance of the seamless stainless steel tube and make the replacement of the double-layer composite seamless stainless steel tube more convenient.

[0025] Reference Figure 2 , 3 The installation structure 2 includes a mounting base 21 fixed at intervals on the inner tube 11 and a fixing plate 22 fixed at intervals on the inner side wall of the outer tube 12. The mounting base 21 is provided with a plug groove 211, and one side of the plug groove 211 is connected to a fixing groove 212 for accommodating the corresponding fixing plate 22. After the fixing plate 22 is inserted into the plug groove 211, the fixing plate 22 is moved into the fixing groove 212 by rotating the outer tube 12.

[0026] Reference Figure 1 The installation structure 2 also includes a positioning ring 23, which is disposed opposite to both ends of the outer tube 12. Both ends of the outer tube 12 extend to the corresponding ends of the inner tube 11, forming a receiving cavity 5 between the corresponding ends of the outer tube 12 and the inner tube 11. The positioning ring 23 is housed in the corresponding receiving cavity 5, which prevents the positioning ring 23 from protruding outside the outer tube 12 and also improves the installation stability of the positioning ring 23. The positioning ring 23 is installed in the corresponding receiving cavity 5 through the positioning structure 3.

[0027] Reference Figure 1 The positioning structure 3 includes a positioning plate 31 and a positioning groove 32. The positioning plate 31 is fixed at intervals to the circumferential sidewall of the positioning ring 23, and the positioning groove 32 is opened on the sidewall of the outer tube 12 and is used to accommodate and position the positioning plate 31.

[0028] Reference Figure 1 The installation structure 2 also includes a limiting plate 24, which is fixed at intervals to the side wall of the positioning ring 23 near the inner tube 11. The positioning ring 23 can support several limiting plates 24 to achieve synchronous positioning of the fixing plate 22 at multiple points. When the fixing plate 22 is placed in the fixing groove 212, the positioning plate 31 and the positioning groove 32 guide the limiting plate 24 to be accurately inserted into the insertion groove 211 and abut against the fixing plate 22, thereby preventing the fixing plate 22 from coming out of the fixing groove 212. This achieves convenient positioning of the inner tube 11 and the outer tube 12, improves the thermal expansion and contraction resistance of the seamless stainless steel tube, and facilitates disassembly and assembly.

[0029] Reference Figure 1 The positioning ring 23 is fixed to the end of the inner tube 11 by spaced positioning bolts 4, which further improves the installation stability of the positioning ring 23.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-temperature and corrosion-resistant composite seamless stainless steel pipe, comprising a steel pipe body (1), characterized in that: The main body of the steel pipe (1) includes an inner tube (11) and an outer tube (12) connected by an installation structure (2). The installation structure (2) includes a mounting seat (21) fixed on the inner tube (11) and a fixing plate (22) fixed on the inner side wall of the outer tube (12). The fixing plate (22) is inserted into the mounting seat (21), and when the outer tube (12) rotates, the fixing plate (22) is housed and positioned in the mounting seat (21).

2. The high-temperature and corrosion-resistant composite seamless stainless steel pipe according to claim 1, characterized in that: The mounting structure (2) also includes a limiting plate (24). The mounting base (21) has a plug-in groove (211), and one side of the plug-in groove (211) is connected to a fixing groove (212) for accommodating the fixing plate (22). After the fixing plate (22) is inserted into the plug-in groove (211), it enters the fixing groove (212). When the fixing plate (22) is accommodated in the fixing groove (212), the limiting plate (24) is inserted into the plug-in groove (211) and abuts against the fixing plate (22).

3. The high-temperature and corrosion-resistant composite seamless stainless steel pipe according to claim 2, characterized in that: The installation structure (2) also includes a positioning ring (23), and a limiting plate (24) is fixed on the side wall of the positioning ring (23); the end of the outer tube (12) extends out of the inner tube (11) to form a receiving cavity (5), and the positioning ring (23) is received in the receiving cavity (5).

4. The high-temperature and corrosion-resistant composite seamless stainless steel pipe according to claim 3, characterized in that: The positioning rings (23) are positioned opposite each other at both ends of the inner tube (11), and the positioning rings (23) are installed in the corresponding accommodating cavities (5) through the positioning structure (3).

5. The high-temperature and corrosion-resistant composite seamless stainless steel pipe according to claim 4, characterized in that: The positioning structure (3) includes a positioning plate (31) and a positioning groove (32). The positioning plate (31) is fixed at intervals to the circumferential sidewall of the positioning ring (23). The positioning groove (32) is opened on the sidewall of the outer tube (12) and is used for the positioning plate (31) to accommodate and position.

6. The high-temperature and corrosion-resistant composite seamless stainless steel pipe according to claim 3, characterized in that: The positioning ring (23) is fixed to the end of the inner tube (11) by spaced positioning bolts (4).

7. The high-temperature and corrosion-resistant composite seamless stainless steel pipe according to claim 1, characterized in that: The outer tube (12) and the inner tube (11) are made of low alloy heat-resistant steel, and the inner wall of the inner tube (11) is provided with a graphite layer.

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