Spiral steel pipe with high corrosion resistance
By installing a pressure-resistant protection device on the outside of the spiral steel pipe and spraying an anti-corrosion coating, the problems of insufficient corrosion resistance and pressure resistance of traditional spiral steel pipes are solved, achieving a highly efficient protective effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI PROVINCE SHENZHOU STEEL PIPE MFG CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-05-05
AI Technical Summary
Traditional spiral steel pipes have limited corrosion resistance in complex corrosive environments, and their inner and outer walls are prone to corrosion, affecting their service life and performance. Furthermore, their pressure resistance is insufficient, making them difficult to adapt to different working conditions and complex stress conditions.
A pressure-resistant protection device is installed on the outside of the spiral steel pipe. The inner and outer walls are sprayed with anti-corrosion coatings. The material is low alloy corrosion-resistant steel, combined with EPDM rubber and chrome-plated carbon steel pressure-resistant rings to form a double-effect protection. The pressure is dispersed through sealed columnar air pressure holes.
It achieves comprehensive improvement in corrosion resistance and pressure resistance of spiral steel pipes, enhances service life and safety in complex environments, effectively disperses pressure, and adapts to various working conditions.
Smart Images
Figure CN224201365U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of pipeline-related technology, specifically relating to a highly corrosion-resistant spiral steel pipe. Background Technology
[0002] In modern industry, spiral welded steel pipes are widely used in many fields such as oil and natural gas transportation and construction engineering. However, traditional spiral welded steel pipes face some problems during use. On the one hand, the complex environments they operate in are often corrosive. Although some steel pipes have undergone anti-corrosion treatment, the effect is limited. Over time, the inner and outer walls are easily corroded, affecting the service life and performance of the steel pipes, and in severe cases, even leading to safety hazards. On the other hand, during transportation, installation, and use, spiral welded steel pipes are often subjected to external compression and impact. Ordinary steel pipes have insufficient compressive strength, and even if some spiral welded steel pipes have compressive protection measures, they are mostly simple structures that cannot effectively distribute pressure and are difficult to adapt to different working conditions and complex stress conditions. Utility Model Content
[0003] The purpose of this utility model is to provide a highly corrosion-resistant spiral steel pipe to solve the problems mentioned in the background art. Traditional spiral steel pipes are exposed to complex corrosive environments for a long time. Although there are anti-corrosion measures, the effect is limited. Their inner and outer walls are easily corroded, affecting their lifespan and performance, and even causing safety hazards. Furthermore, their pressure resistance is insufficient during transportation, installation and use. Existing simple pressure protection cannot effectively disperse pressure and is difficult to adapt to different working conditions and complex stresses.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a highly corrosion-resistant spiral steel pipe, comprising a spiral steel pipe body and a steel pipe mounting flange A disposed on the outer side of the left end of the spiral steel pipe body, and a steel pipe mounting flange B disposed on the outer side of the right end of the spiral steel pipe body. Both the steel pipe mounting flange A and the steel pipe mounting flange B are fixedly connected to the spiral steel pipe body by welding, and both the steel pipe mounting flange A and the steel pipe mounting flange B have multiple screw holes equidistantly arranged inside. The inner and outer walls of the spiral steel pipe body are coated with an anti-corrosion coating, and multiple pressure-resistant protection devices are sleeved on the outer side of the spiral steel pipe body, and the multiple pressure-resistant protection devices are closely fitted together.
[0005] Preferably, the pressure-resistant protection device includes an annular inner groove A, a pressure-resistant steel ring A, a thickened elastic rubber sleeve, an annular inner groove B, and a pressure-resistant steel ring B. The thickened elastic rubber sleeve is fitted onto the outside of the spiral steel pipe body. The left end of the thickened elastic rubber sleeve has an annular inner groove A, and the right end of the thickened elastic rubber sleeve has an annular inner groove B. The annular inner groove A contains the pressure-resistant steel ring A, and the annular inner groove B contains the pressure-resistant steel ring B. Both the pressure-resistant steel ring A and the pressure-resistant steel ring B are fitted onto the outside of the spiral steel pipe body.
[0006] Preferably, the depth of the annular inner groove A and the annular inner groove B is two-thirds of the thickness of the thickened elastic rubber sleeve. The pressure-resistant steel ring A and the pressure-resistant steel ring B are respectively fixed inside the annular inner groove A and the annular inner groove B by adhesive. The circular inner wall of the pressure-resistant steel ring A and the pressure-resistant steel ring B is flush with the circular inner wall of the thickened elastic rubber sleeve.
[0007] Preferably, the pressure-resistant protection device further includes columnar air pressure holes. Multiple columnar air pressure holes are equidistantly arranged inside the thickened elastic rubber sleeve. The two ends of the multiple columnar air pressure holes are close to the annular inner groove A and the annular inner groove B, respectively, but the two ends of the columnar air pressure holes do not penetrate the annular inner groove A and the annular inner groove B, and the multiple columnar air pressure holes are all in a sealed state inside the thickened elastic rubber sleeve.
[0008] Preferably, the thickened elastic rubber sleeve is made of EPDM rubber, and both the compression steel ring A and the compression steel ring B are made of carbon steel, with the inner and outer walls of both compression steel ring A and the compression steel ring B being chrome-plated.
[0009] Preferably, the spiral steel pipe body is mainly made of low alloy corrosion-resistant steel and formed by spiral weld. The anti-corrosion coating is double-layered, with the bottom layer being epoxy primer and the top layer being polyurethane topcoat.
[0010] Preferably, the inner circular wall of the spiral steel pipe body is smooth and without obvious protrusions, and the outer wall of the spiral steel pipe body is flush with the outer wall of the left end of the steel pipe installation flange A and the outer wall of the right end of the steel pipe installation flange B.
[0011] Compared with the prior art, this utility model provides a highly corrosion-resistant spiral steel pipe, which has the following beneficial effects:
[0012] This invention adds a novel pressure-resistant protection device to the outside of the spiral steel pipe. The anti-corrosion coating and this novel pressure-resistant protection device work together to protect the spiral steel pipe, constructing a dual-effect protection system of corrosion prevention and pressure resistance. The pressure-resistant protection device uses a thickened EPDM rubber sleeve as the elastic matrix, with an embedded chrome-plated carbon steel pressure-resistant ring forming a rigid support ring. Dynamic pressure buffering and dispersion are achieved through sealed columnar air pressure holes. The thickened elastic rubber sleeve is made of EPDM rubber, which has good elasticity and flexibility, and can buffer external impact forces, reducing direct impact on the spiral steel pipe body. Pressure-resistant steel rings A and B are made of carbon steel with chrome plating on both the inner and outer walls, which not only has high strength and further enhances the pressure resistance, but the chrome plating also improves its corrosion resistance. The reasonable depth design of the annular embedded grooves A and B and the fixing method of the pressure-resistant steel rings ensure that the pressure-resistant steel rings function effectively while maintaining good stability. The columnar air pressure holes can disperse pressure when under pressure, and the sealing design can prevent moisture intrusion, thus comprehensively improving the pressure resistance and protection performance of the spiral steel pipe. Attached Figure Description
[0013] Figure 1 This is a three-dimensional structural diagram of a highly corrosion-resistant spiral steel pipe according to the present invention.
[0014] Figure 2 This is a schematic diagram of the planar structure of a highly corrosion-resistant spiral steel pipe according to this utility model.
[0015] Figure 3 This is a cross-sectional three-dimensional structural diagram of the pressure-resistant protection device of this utility model.
[0016] Figure 4 This is a three-dimensional structural diagram of the pressure-resistant protection device of this utility model, showing both horizontal and vertical cross-sectional views.
[0017] Figure 5 This is a schematic diagram of the external three-dimensional structure of the pressure-resistant protection device of this utility model.
[0018] In the diagram: 1. Steel pipe installation flange A; 2. Spiral steel pipe body; 3. Pressure protection device; 4. Anti-corrosion coating; 5. Steel pipe installation flange B; 6. Annular inner groove A; 7. Pressure-resistant steel ring A; 8. Thickened elastic rubber sleeve; 9. Columnar air pressure hole; 10. Annular inner groove B; 11. Pressure-resistant steel ring B. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] This utility model provides, for example Figure 1-5 The diagram illustrates a highly corrosion-resistant spiral steel pipe, comprising a spiral steel pipe body 2 and a steel pipe mounting flange A1 located on the left outer side of the spiral steel pipe body 2. A steel pipe mounting flange B5 is located on the right outer side of the spiral steel pipe body 2. Both flanges A1 and B5 are fixedly connected to the spiral steel pipe body 2 by welding. Both flanges A1 and B5 have multiple equally spaced screw holes inside, facilitating the connection and docking of the spiral steel pipe with other equipment and pipelines, enabling system assembly and operation. The inner and outer walls of the spiral steel pipe body 2 are coated with an anti-corrosion coating 4. The circular inner wall of the spiral steel pipe body 2 is smooth and without obvious protrusions. The spiral steel pipe body 2 is connected to the steel pipe mounting flange... The outer wall of the left end of flange A1 and the outer wall of the right end of flange B5, which is connected to the steel pipe, are flush. The spiral steel pipe body 2 is mainly made of low alloy corrosion-resistant steel and formed by spiral weld. The anti-corrosion coating 4 adopts a double-layer setting. The bottom layer of the anti-corrosion coating 4 is epoxy primer, and the top layer of the anti-corrosion coating 4 is polyurethane topcoat. The epoxy primer has excellent adhesion and can adhere tightly to the inner and outer walls of the spiral steel pipe body 2, forming the first anti-corrosion barrier, effectively preventing external corrosive substances from directly contacting the steel pipe body. The top layer is polyurethane topcoat. Polyurethane topcoat has good weather resistance, wear resistance and chemical resistance, which can further isolate the erosion of moisture, oxygen and various corrosive chemicals in the environment. The two work together to greatly improve the anti-corrosion performance of the steel pipe.
[0021] like Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, multiple pressure-resistant protection devices 3 are fitted around the outside of the spiral steel pipe body 2. These devices are closely fitted together, forming a continuous support system between adjacent devices. This prevents displacement or detachment of multiple protection devices, making it particularly suitable for long-distance pipeline laying. Each pressure-resistant protection device 3 includes an annular groove A6, a pressure-resistant steel ring A7, a thickened elastic rubber sleeve 8, an annular groove B10, and a pressure-resistant steel ring B11. The thickened elastic rubber sleeve 8 is fitted around the outside of the spiral steel pipe body 2. An annular groove A6 is located inside the left end of the thickened elastic rubber sleeve 8, and an annular groove B10 is located inside the right end. The pressure-resistant steel ring A7 is located inside the annular groove A6, and the pressure-resistant steel ring B11 is located inside the annular groove B10. Both the pressure-resistant steel rings A7 and B11 are fitted around the outside of the spiral steel pipe body 2. The depth of the annular embedded grooves A6 and B10 is two-thirds the thickness of the thickened elastic rubber sleeve 8. The pressure-resistant steel rings A7 and B11 are fixed inside the annular embedded grooves A6 and B10 respectively with adhesive. The circular inner walls of the pressure-resistant steel rings A7 and B11 are flush with the circular inner wall of the thickened elastic rubber sleeve 8. The depth of the annular embedded grooves A6 and B10 is designed to be two-thirds the thickness of the thickened elastic rubber sleeve 8, which ensures that the pressure-resistant steel rings A7 and B11 can be stably embedded without hindering the elasticity of the rubber sleeve itself. The pressure-resistant steel rings A7 and B11 are fixed in the annular embedded grooves with adhesive, and the circular inner walls are flush with the circular inner walls of the thickened elastic rubber sleeve 8, ensuring that the entire pressure-resistant protection device 3 can fit tightly against the outer wall of the steel pipe, forming a complete and uniform pressure-resistant protective layer.
[0022] like Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the pressure-resistant protection device 3 also includes columnar air pressure holes 9. Multiple columnar air pressure holes 9 are equidistantly arranged inside the annular thickened elastic rubber sleeve 8. The two ends of each columnar air pressure hole 9 are close to the annular inner groove A6 and the annular inner groove B10, respectively, but the two ends of the columnar air pressure holes 9 do not penetrate the annular inner grooves A6 and B10. Furthermore, the multiple columnar air pressure holes 9 are all in a sealed state inside the thickened elastic rubber sleeve 8. The columnar air pressure holes 9 are equidistantly distributed inside, with their ends close to but not penetrating the annular inner grooves A6 and B10, and are in a sealed state. When subjected to external pressure, the air inside the columnar air pressure holes 9 is compressed, and the air pressure distribution changes, which can quickly disperse the pressure throughout the entire pressure-resistant protection device 3. To further enhance the pressure resistance and protect the spiral steel pipe body 2, the thickened elastic rubber sleeve 8 is made of EPDM rubber. EPDM rubber has good elasticity, aging resistance and sealing properties. It can undergo elastic deformation when subjected to external pressure, absorbing and dispersing part of the impact force, thus buffering and protecting the spiral steel pipe. The pressure-resistant steel rings A7 and B11 are both made of carbon steel, and the inner and outer walls of the pressure-resistant steel rings A7 and B11 are chrome-plated. Carbon steel ensures that the steel rings have high strength and rigidity and can withstand greater pressure. The chrome plating treatment not only prevents corrosion but also makes the surface of the steel rings smoother, reducing friction with external objects and further improving the durability of the pressure-resistant protection device 3.
[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A highly corrosion-resistant spiral steel pipe, comprising a spiral steel pipe body (2) and a steel pipe mounting flange A (1) disposed on the outer side of the left end of the spiral steel pipe body (2), and a steel pipe mounting flange B (5) disposed on the outer side of the right end of the spiral steel pipe body (2), wherein the steel pipe mounting flange A (1) and the steel pipe mounting flange B (5) are both fixedly connected to the spiral steel pipe body (2) by welding, and both the steel pipe mounting flange A (1) and the steel pipe mounting flange B (5) are provided with a plurality of screw holes at equal intervals inside, characterized in that: The inner and outer walls of the spiral steel pipe body (2) are coated with an anti-corrosion coating (4), and the spiral steel pipe body (2) is fitted with multiple pressure protection devices (3), and the multiple pressure protection devices (3) are closely fitted to each other. The pressure-resistant protection device (3) includes an annular inner groove A (6), a pressure-resistant steel ring A (7), a thickened elastic rubber sleeve (8), an annular inner groove B (10), and a pressure-resistant steel ring B (11). The thickened elastic rubber sleeve (8) is fitted onto the outside of the spiral steel pipe body (2). The left end of the thickened elastic rubber sleeve (8) is provided with an annular inner groove A (6), and the right end of the thickened elastic rubber sleeve (8) is provided with an annular inner groove B (10). The annular inner groove A (6) is provided with a pressure-resistant steel ring A (7), and the annular inner groove B (10) is provided with a pressure-resistant steel ring B (11). Both the pressure-resistant steel ring A (7) and the pressure-resistant steel ring B (11) are fitted onto the outside of the spiral steel pipe body (2).
2. The highly corrosion-resistant spiral steel pipe according to claim 1, characterized in that: The depth of the annular inner groove A (6) and the annular inner groove B (10) is two-thirds of the thickness of the thickened elastic rubber sleeve (8). The pressure-resistant steel ring A (7) and the pressure-resistant steel ring B (11) are fixed inside the annular inner groove A (6) and the annular inner groove B (10) respectively by adhesive. The circular inner wall of the pressure-resistant steel ring A (7) and the pressure-resistant steel ring B (11) is flush with the circular inner wall of the thickened elastic rubber sleeve (8).
3. The highly corrosion-resistant spiral steel pipe according to claim 2, characterized in that: The pressure protection device (3) also includes columnar air pressure holes (9). The thickened elastic rubber sleeve (8) has multiple columnar air pressure holes (9) arranged at equal intervals inside the annulus. The two ends of the multiple columnar air pressure holes (9) are close to the annular inner groove A (6) and the annular inner groove B (10) respectively, but the two ends of the columnar air pressure holes (9) do not penetrate the annular inner groove A (6) and the annular inner groove B (10), and the multiple columnar air pressure holes (9) are all in a sealed state inside the thickened elastic rubber sleeve (8).
4. The highly corrosion-resistant spiral steel pipe according to claim 3, characterized in that: The thickened elastic rubber sleeve (8) is made of EPDM rubber, and the pressure-resistant steel ring A (7) and pressure-resistant steel ring B (11) are both made of carbon steel, and the inner and outer walls of the pressure-resistant steel ring A (7) and pressure-resistant steel ring B (11) are chrome-plated.
5. The highly corrosion-resistant spiral steel pipe according to claim 1, characterized in that: The spiral steel pipe body (2) is mainly made of low alloy corrosion-resistant steel and formed by spiral weld. The anti-corrosion coating (4) is set in two layers. The bottom layer of the anti-corrosion coating (4) is epoxy primer and the top layer of the anti-corrosion coating (4) is polyurethane topcoat.
6. The high corrosion resistance spiral steel pipe according to claim 1, characterized in that: The inner wall of the spiral steel pipe body (2) is smooth and without obvious protrusions. The outer wall of the spiral steel pipe body (2) is flush with the outer wall of the left end of the steel pipe installation flange A (1) and the outer wall of the right end of the steel pipe installation flange B (5).