Corrosion-resistant spiral steel pipe

Abstract

The utility model provides a kind of corrosion -resistant spiral steel pipe, the utility model includes spiral inner tube body and seamless outer tube body, and interlayer space is formed between spiral inner tube body and seamless outer tube body, and interlayer space is filled with heat preservation filling layer, the outer surface of spiral inner tube body and the inner surface of seamless outer tube body are equipped with corrosion -resistant coating, and the both ends of spiral inner tube body and seamless outer tube body are respectively equipped with first connecting frame and second connecting frame, the edge of first connecting frame is equipped with insert block one, the edge of second connecting frame is equipped with the slot compatible with insert block one, the edge of second connecting frame is equipped with insert block two, the edge of first connecting frame is equipped with the slot compatible with insert block two, and the opening is formed between first connecting frame and second connecting frame, and reinforcing strip is inserted in the opening.The utility model can improve environmental adaptability by double corrosion -resistant coating, optimize the sealing property of connecting structure, enhance the synergistic effect of reinforcing strip and heat preservation layer, to prolong service life and ensure operating stability.

Description

Technical Field

[0001] This utility model relates to the field of pipeline engineering technology, and in particular to a corrosion-resistant spiral steel pipe. Background Technology

[0002] Spiral steel pipes are widely used in petrochemical, municipal water supply and drainage, marine engineering, and sewage treatment fields due to their high strength, simple forming process, and adaptability to large-diameter pipeline requirements, undertaking key functions such as fluid transportation and structural support.

[0003] The prior art discloses a novel anti-corrosion spiral steel pipe with application number 202220704087.0, comprising a spiral steel pipe body, a high-temperature resistant adhesive layer, and a first anti-corrosion layer. The inner wall of the spiral steel pipe body is provided with a second anti-corrosion layer, and the outer wall of the spiral steel pipe body is provided with a high-temperature resistant adhesive layer. A first pressure-resistant ring is installed on the outer wall of the high-temperature resistant adhesive layer, and a second pressure-resistant ring is installed on the outer wall of the first pressure-resistant ring. A reinforcing layer is provided between the first and second pressure-resistant rings, and reinforcing ribs are cross-installed inside the reinforcing layer. The outer wall of the second pressure-resistant ring is provided with the first anti-corrosion layer, and an anti-corrosion coating is installed on the outer wall of the first anti-corrosion layer. This device uses anti-corrosion materials on both the inner and outer sides of the spiral steel pipe body, and chlorinated rubber is provided on the inner side of the spiral steel pipe body. Chlorinated rubber has excellent film-forming properties, adhesion, corrosion resistance, flame retardancy, and insulation, increasing the performance of the spiral steel pipe body. However, existing technologies still have limitations, with anti-corrosion layers often consisting of a single material or simple layering, making it difficult to withstand long-term erosion from different media (such as acidic wastewater and saline seawater). Furthermore, the inner and outer anti-corrosion layers lack synergistic protection design; the bond between the pressure-resistant structure and the insulation layer is not tight enough, making the insulation layer susceptible to damage from external impacts, which also affects the overall structural stability. Therefore, we propose a corrosion-resistant spiral steel pipe to address these issues. Utility Model Content

[0004] To address the shortcomings mentioned above, this utility model provides a corrosion-resistant spiral steel pipe that can improve weather resistance, enhance the compatibility of structural strength and thermal insulation performance, and optimize the sealing and corrosion resistance of connection parts through the synergistic effect of layered anti-corrosion coatings, thereby adapting to more complex corrosive environments and extending service life.

[0005] To solve the above problems, the technical solution provided by this utility model is as follows:

[0006] A corrosion-resistant spiral steel pipe includes a spiral inner tube and a seamless outer tube, with a sandwich space formed between the spiral inner tube and the seamless outer tube. The sandwich space is filled with a thermal insulation layer. Both the outer surface of the spiral inner tube and the inner surface of the seamless outer tube are coated with a corrosion-resistant coating. A first connecting frame and a second connecting frame are respectively installed at both ends of the spiral inner tube and the seamless outer tube. The edge of the first connecting frame is provided with a first insert block, and the edge of the second connecting frame is provided with a slot adapted to the first insert block. The edge of the second connecting frame is provided with a second insert block, and the edge of the first connecting frame is provided with a slot adapted to the second insert block. An opening is formed between the first connecting frame and the second connecting frame, and a reinforcing strip is inserted into the opening.

[0007] Furthermore, the corrosion-resistant coating of the spiral inner tube is an epoxy ceramic coating, and the corrosion-resistant coating on the inner surface of the seamless outer tube is a polyurea elastomer coating.

[0008] Furthermore, the thermal insulation filling layer is made of high-density polyethylene foam.

[0009] Furthermore, the cross-sectional shape of the opening is adapted to the reinforcing strip, and the reinforcing strip fits tightly against the inner wall of the opening after being inserted.

[0010] Furthermore, the inner spiral tube is made of spiral welded steel pipe, the outer seamless tube is made of seamless steel pipe, and the inner diameter of the inner spiral tube is smaller than the outer diameter of the outer seamless tube, forming a uniform interlayer space.

[0011] Furthermore, both the first connecting frame and the second connecting frame are annular steel plate structures, and are fully welded to the ends of the spiral inner tube and the seamless outer tube.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. The spiral inner tube has an epoxy ceramic coating that resists media corrosion, while the seamless outer tube has a polyurea coating that resists seepage and deformation. The dual coatings provide precise protection against corrosion risks in different parts of the tube, significantly improving weather resistance compared to traditional single anti-corrosion layers. It is especially suitable for complex environments with alternating media.

[0014] 2. The high-density polyethylene foam filling layer not only provides thermal insulation but also cushions impacts. Combined with the seamless outer tube and spiral inner tube, it ensures structural strength while preventing the insulation layer from being damaged due to structural deformation, thus extending the overall service life.

[0015] 3. The bidirectional plug-in connector design, combined with reinforcing strips, enhances the connection strength. Full welding combined with sealing gaskets ensures the sealing of the connection. Weld repair treatment avoids the weak points of corrosion in traditional connections, improving the overall corrosion resistance of the pipeline.

[0016] 4. The coating thickness or insulation layer density can be adjusted according to the characteristics of the conveying medium (such as temperature and corrosivity), making it suitable for various fields such as petrochemicals, municipal water supply and drainage, and marine engineering, especially performing well in high humidity and high salinity environments.

[0017] In summary, this type of corrosion-resistant spiral steel pipe has wide applicability, addressing the problems mentioned in the background section. Existing technologies often use single-material or simple layering of anti-corrosion layers, making them ill-suited to withstand long-term erosion from different media (such as acidic wastewater and saline seawater). Furthermore, the inner and outer anti-corrosion layers lack synergistic protection design; the bonding between the pressure-resistant structure and the insulation layer is not tight enough, making the insulation layer susceptible to damage from external impacts, thus affecting the overall structural stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the opening in this utility model.

[0020] Explanation of key component symbols:

[0021] 1- Spiral inner tube body, 2- Seamless outer tube body, 3- Thermal insulation filling layer, 4- Reinforcing strip, 5- First connecting frame, 501- Insert block one, 6- Second connecting frame, 601- Insert block two, 7- Opening. Detailed Implementation

[0022] 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 the accompanying drawings and examples, but the examples given are not intended to limit the present utility model.

[0023] like Figure 1 and Figure 2 As shown, the embodiment of this utility model includes a spiral inner tube 1 and a seamless outer tube 2. A sandwich space is formed between the spiral inner tube 1 and the seamless outer tube 2. The sandwich space is filled with a heat-insulating filling layer 3. The outer surface of the spiral inner tube 1 and the inner surface of the seamless outer tube 2 are both provided with a corrosion-resistant coating. A first connecting frame 5 and a second connecting frame 6 are respectively installed at both ends of the spiral inner tube 1 and the seamless outer tube 2. The edge of the first connecting frame 5 is provided with a first insert block 501. The edge of the second connecting frame 6 is provided with a slot adapted to the first insert block 501. The edge of the second connecting frame 6 is provided with a second insert block 601. The edge of the first connecting frame 5 is provided with a slot adapted to the second insert block 601. An opening 7 is formed between the first connecting frame 5 and the second connecting frame 6. A reinforcing strip 4 is inserted into the opening 7.

[0024] The spiral inner tube 1 is made of spiral welded steel pipe, and the seamless outer tube 2 is made of seamless steel pipe. The inner diameter of the spiral inner tube 1 is smaller than the outer diameter of the seamless outer tube 2, forming a uniform sandwich space. The spiral inner tube 1 of the spiral welded steel pipe has high structural strength and economy, making it suitable for the main load-bearing of the transported medium; the seamless outer tube 2 of the seamless steel pipe has better sealing and pressure resistance. The sandwich space formed by the combination of the two provides a reasonable layout for the insulation and corrosion protection design.

[0025] In terms of corrosion resistance, the corrosion-resistant coating of the spiral inner tube 1 is an epoxy ceramic coating. Epoxy ceramic has extremely high hardness, wear resistance and chemical corrosion resistance, which can effectively resist the erosion of the inner wall by the medium inside the tube. The corrosion-resistant coating on the inner surface of the seamless outer tube 2 is a polyurea elastomer coating. Polyurea elastomer has excellent elasticity, weather resistance and impact resistance, which can protect the inner surface of the seamless outer tube 2 from the corrosive factors that may exist in the interlayer space. The double coating design greatly improves the overall corrosion resistance of the steel pipe.

[0026] The insulation filling layer 3 is made of high-density polyethylene foam, which has good thermal insulation performance and low density. After being filled into the interlayer space, it can reduce the heat loss of the medium inside the pipe without significantly increasing the overall weight of the steel pipe. At the same time, it has strong chemical stability and good compatibility with the seamless inner and outer pipe body, and can maintain the insulation effect for a long time.

[0027] Both the first connecting frame 5 and the second connecting frame 6 are annular steel plate structures, and their end connections with the spiral inner tube 1 and the seamless outer tube 2 are fully welded. This full welding process ensures the sealing and robustness of the connection, preventing media leakage or external moisture from entering the interlayer space. The two components achieve precise alignment through the cooperation of inserts and slots. The reinforcing strip 4 inserted into the opening 7 fits tightly against the inner wall of the opening, and the cross-sectional shape of the opening 7 matches the reinforcing strip 4, further enhancing the structural strength of the end connection and preventing end deformation of the steel pipe during installation or use, thus ensuring the stability of the connection.

[0028] All electrical components mentioned in the text are electrically connected to an external controller and power supply, and the controller can be a conventional known device such as a computer that provides control.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A corrosion-resistant spiral steel pipe, comprising a spiral inner tube (1) and a seamless outer tube (2), wherein a sandwich space is formed between the spiral inner tube (1) and the seamless outer tube (2), and the sandwich space is filled with a thermal insulation layer (3), characterized in that, The outer surface of the spiral inner tube (1) and the inner surface of the seamless outer tube (2) are both provided with corrosion-resistant coatings. The two ends of the spiral inner tube (1) and the seamless outer tube (2) are respectively equipped with a first connecting frame (5) and a second connecting frame (6). The edge of the first connecting frame (5) is provided with a first insert (501). The edge of the second connecting frame (6) is provided with a slot adapted to the first insert (501). The edge of the second connecting frame (6) is provided with a second insert (601). The edge of the first connecting frame (5) is provided with a slot adapted to the second insert (601). An opening (7) is formed between the first connecting frame (5) and the second connecting frame (6). A reinforcing strip (4) is inserted into the opening (7).

2. The corrosion-resistant spiral steel pipe as described in claim 1, characterized in that, The corrosion-resistant coating of the spiral inner tube (1) is an epoxy ceramic coating, and the corrosion-resistant coating on the inner surface of the seamless outer tube (2) is a polyurea elastomer coating.

3. The corrosion-resistant spiral steel pipe as described in claim 2, characterized in that, The thermal insulation filling layer (3) is made of high-density polyethylene foam.

4. The corrosion-resistant spiral steel pipe as described in claim 3, characterized in that, The cross-sectional shape of the opening (7) is adapted to the reinforcing strip (4), and the reinforcing strip (4) fits tightly against the inner wall of the opening after being inserted.

5. The corrosion-resistant spiral steel pipe as described in claim 4, characterized in that, The spiral inner tube (1) is made of spiral welded steel pipe, and the seamless outer tube (2) is made of seamless steel pipe. The inner diameter of the spiral inner tube (1) is smaller than the outer diameter of the seamless outer tube (2), forming a uniform interlayer space.

6. The corrosion-resistant spiral steel pipe as described in claim 5, characterized in that, Both the first connecting frame (5) and the second connecting frame (6) are annular steel plate structures, and are fully welded to the ends of the spiral inner tube (1) and the seamless outer tube (2).

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