Corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipe

Abstract

The utility model provides a corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for a fluid pipe, which comprises a shielding shell, a protective cushion layer, a connecting steel pipe layer, a corrosion-resistant inner layer and a protective shell, the protective cushion layer is fixedly mounted in the shielding shell, the connecting steel pipe layer is fixedly mounted in the protective cushion layer, and the corrosion-resistant inner layer is fixedly mounted in the protective shell. The anti-corrosion inner layer is fixedly mounted in the connecting steel pipe layer; the protective shell is fixedly mounted on the outer side of the shielding shell; due to the arrangement of the shielding shell and the connecting steel pipe layer, the corrosion resistance, the high pressure resistance, the thermal expansion adaptability and the protection performance are high.

Description

Technical Field

[0001] This utility model relates to the field of stainless steel pipe technology, and in particular to a corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipes. Background Technology

[0002] With the rapid development of modern industry, various fluid transportation systems are placing increasingly higher demands on pipeline performance. Especially in fields such as petroleum, chemical, power, natural gas, and metallurgy, pipelines, as core components of fluid transportation, withstand the challenges of complex operating conditions such as high temperature, high pressure, and strong corrosiveness. While traditional single-material pipelines can meet basic requirements in some common applications, the increasing demands for safety, reliability, long service life, and low maintenance costs in fluid transportation have gradually revealed some problems and shortcomings in existing technologies.

[0003] Poor corrosion resistance: Although existing composite pipeline technologies use anti-corrosion layers or special materials, their protective effect is still insufficient when facing long-term highly corrosive environments, especially under high pressure conditions.

[0004] Poor high pressure resistance: Existing pipeline technology has weak pressure resistance under high pressure environment and cannot guarantee the safety and stability of pipelines under extreme conditions.

[0005] Poor adaptability to thermal expansion: Many traditional pipeline designs have failed to effectively address the thermal expansion problem of pipelines under temperature changes, which makes the pipelines prone to structural damage during long-term use.

[0006] Insufficient protection: Despite the adoption of some external protection measures, existing pipelines are often easily damaged by external physical collisions and friction, which affects the long-term use of the pipelines.

[0007] Therefore, it is essential to invent a corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipelines. Utility Model Content

[0008] To address the aforementioned technical problems, this utility model provides a corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipelines, solving the problems of poor corrosion resistance, poor high-pressure resistance, poor thermal expansion adaptability, and insufficient protection that still exist in existing seamless stainless steel pipes. A corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipelines includes a shielding shell, a protective pad, a connecting steel pipe layer, an anti-corrosion inner layer, and a protective outer shell, wherein: the protective pad is fixedly installed inside the shielding shell, and the connecting steel pipe layer is fixedly installed inside the protective pad; the anti-corrosion inner layer is fixedly installed inside the connecting steel pipe layer; the protective outer shell is fixedly installed outside the shielding shell.

[0009] The shielding shell includes an isolation shell, tensile ribs, and a compression-resistant frame, with the tensile ribs and the compression-resistant frame fixedly connected together and fixedly installed inside the isolation shell.

[0010] The connecting steel pipe layer includes an inner steel pipe, a connecting groove, an outer steel pipe, a connecting convex strip, and a stabilizing connection groove. The connecting groove is located on the outer surface of the inner steel pipe. The connecting convex strip is located on the inner wall of the outer steel pipe. The inner and outer steel pipes are slidably connected together by the connecting groove and the connecting convex strip. The stabilizing connection groove is located on the outer side of the outer steel pipe, and a protective pad is slidably installed on its outer side.

[0011] The internal isolation shell of the shielding shell adopts a tubular structure made of aluminum silicate fiber, and both the tensile ribs and the compressive skeleton are made of metal. The direction of the tensile ribs is consistent with that of the isolation shell, and the compressive skeleton is made of metal tube, which is parallel to the cross-section of the isolation shell. It has the following functions: ① Protection: The shielding shell, combined with the internal protective pad and other layers, such as the anti-corrosion inner layer, further enhances the corrosion resistance of the pipeline and protects the pipeline from corrosive media, such as chemicals, acid and alkali liquids, etc. ② Thermal isolation: The shielding shell also plays a role in thermal isolation, helping the pipeline maintain a suitable temperature. Especially when the fluid temperature is high or low, the shielding shell can prevent the external temperature from affecting the inside of the pipeline, thereby ensuring the temperature stability of the fluid. ③ Enhanced pipeline safety: The shielding shell is a safety barrier in the pipeline system, preventing external substances from affecting or damaging the internal fluid pipe, and ensuring the sealing and normal operation of the pipeline.

[0012] The grooves and protrusions inside the inner and outer steel pipes of the connecting steel pipe layer are formed by broaching, and a small gap is left between the inner and outer steel pipes. The inner and outer steel pipes are connected by the interlocking of the connecting grooves and connecting protrusions, preventing them from rotating relative to each other. This design serves the following functions: ① Enhancing the structural strength of the pipeline: The connecting steel pipe layer, through the cooperation of the inner and outer steel pipes, provides strength and stability to the pipeline. They can withstand external pressure and the high pressure of the internal fluid, preventing the pipeline from rupturing or deforming under high pressure. Especially in the transportation of high-pressure and high-temperature fluids, the connecting steel pipe layer strengthens the overall pressure resistance of the pipeline; ② Providing support for corrosion protection and high-pressure resistance: The connecting steel pipe layer, together with the anti-corrosion inner layer and the protective outer shell, forms a multi-layered composite structure, giving the pipeline strong corrosion resistance and high-pressure resistance. The connecting steel pipe layer is one of the foundations for realizing this composite protective structure, ensuring that the pipeline can operate stably for a long time in corrosive environments and withstand the impact of high-pressure fluids; ③ Preventing the effects of thermal expansion and contraction: The connecting steel pipe layer, through its design... For example, the sliding connection method using connecting grooves and connecting protrusions can effectively alleviate stress caused by thermal expansion or contraction due to temperature changes. As the temperature rises or falls, the inner and outer steel pipes may deform due to thermal expansion and contraction, leading to a pressure difference between the inside and outside of the pipeline, and even affecting the pipeline's sealing or stability. The sliding connection of the connecting steel pipe layers ensures that the inner and outer steel pipe layers can slide relative to each other, thereby avoiding stress concentration caused by temperature changes and reducing pipeline damage caused by thermal expansion and contraction. Through this design, the pipeline can more flexibly adapt to temperature changes, maintaining structural integrity and sealing.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The shielding shell of this utility model has the following functions: ① Protection: The shielding shell, combined with the internal protective pad and other layers, such as the anti-corrosion inner layer, further enhances the corrosion resistance of the pipeline and protects the pipeline from corrosive media, such as chemicals, acid and alkali liquids, etc.; ② Thermal isolation: The shielding shell can also play a thermal isolation role, helping the pipeline maintain a suitable temperature. Especially when the fluid temperature is high or low, the shielding shell can prevent the external temperature from affecting the inside of the pipeline, thereby ensuring the temperature stability of the fluid.

[0015] ③ Enhance pipeline safety: The shielding shell is a safety barrier in the pipeline system, preventing external substances from affecting or damaging the internal fluid pipes, and ensuring the pipeline's sealing and normal operation.

[0016] 2. The connecting steel pipe layer of this utility model has the following functions: ① Enhancing the structural strength of the pipeline: The connecting steel pipe layer, through the cooperation of the inner and outer steel pipes, provides strength and stability to the pipeline. They can withstand external pressure and the high pressure of the internal fluid, preventing the pipeline from rupturing or deforming under high pressure. Especially in the transportation of high-pressure and high-temperature fluids, the connecting steel pipe layer plays a role in strengthening the overall pressure resistance of the pipeline; ② Providing support for corrosion protection and high-pressure resistance: The connecting steel pipe layer, together with the anti-corrosion inner layer and the protective outer shell, forms a multi-layer composite structure, giving the pipeline strong corrosion resistance and high-pressure resistance. The connecting steel pipe layer is one of the foundations for realizing this composite protective structure, ensuring that the pipeline can operate stably for a long time in corrosive environments and withstand the impact of high-pressure fluids; ③ Preventing the effects of thermal expansion and contraction: The connecting steel pipe layer, through its design, such as the sliding connection method of the connecting groove and the connecting convex strip, can effectively alleviate the stress caused by thermal expansion or contraction due to temperature changes. As temperature rises or falls, the inner and outer steel pipes may deform due to thermal expansion and contraction, causing a pressure difference between the inside and outside of the pipeline, and even affecting the pipeline's sealing or stability. The connecting steel pipe layers use a sliding connection to ensure that the inner and outer steel pipe layers can slide relative to each other, thereby avoiding stress concentration caused by temperature changes and reducing pipeline damage caused by thermal expansion and contraction. Through this design, the pipeline can more flexibly adapt to temperature changes, maintaining structural integrity and sealing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is an enlarged view of section A of this utility model.

[0019] Figure 3 This is an enlarged view of section B of this utility model.

[0020] In the picture:

[0021] Shielding shell 1, isolation shell 11, anti-tensile rib 12, anti-compression skeleton 13, protective padding layer 2, connecting steel pipe layer 3, inner steel pipe 31, connecting groove 32, outer steel pipe 33, connecting protrusion 34, stable connection groove 35, anti-corrosion inner layer 4, protective outer shell 5. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] As attached Figure 1 To be continued Figure 3 As shown.

[0024] This utility model provides a corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipelines, comprising a shielding shell 1, a protective pad 2, a connecting steel pipe layer 3, an anti-corrosion inner layer 4, and a protective outer shell 5, wherein: the protective pad 2 is fixedly installed inside the shielding shell 1, and the connecting steel pipe layer 3 is fixedly installed inside the protective pad 2, and the anti-corrosion inner layer 4 is fixedly installed inside the connecting steel pipe layer 3; the protective outer shell 5 is fixedly installed on the outside of the shielding shell 1.

[0025] The shielding shell 1 includes an isolation shell 11, a tensile rib 12, and a compression-resistant frame 13, with the tensile rib 12 and the compression-resistant frame 13 fixedly connected together. The tensile rib 12 and the compression-resistant frame 13 are fixedly installed inside the isolation shell 11.

[0026] The connecting steel pipe layer 3 includes an inner steel pipe 31, a connecting groove 32, an outer steel pipe 33, a connecting protrusion 34, and a stabilizing connection groove 35. The connecting groove 32 is disposed on the outer surface of the inner steel pipe 31. The connecting protrusion 34 is disposed on the inner wall of the outer steel pipe 33. The inner steel pipe 31 and the outer steel pipe 33 are slidably connected together by the connecting groove 32 and the connecting protrusion 34. The stabilizing connection groove 35 is disposed on the outer side of the outer steel pipe 33, and a protective pad layer 2 is slidably installed on its outer side.

[0027] The insulating shell 11 inside the shielding shell 1 adopts a tubular structure made of aluminum silicate fiber, and the tensile ribs 12 and the compressive skeleton 13 are both made of metal ribs; the direction of the tensile ribs 12 is consistent with that of the insulating shell 11, and the compressive skeleton 13 is made of metal tube, which is parallel to the cross section of the insulating shell 11.

[0028] The grooves and protrusions inside the inner steel pipe 31 and the outer steel pipe 33 of the connecting steel pipe layer 3 are formed by broaching. A small gap is left between the inner steel pipe 31 and the outer steel pipe 33. The inner steel pipe 31 and the outer steel pipe 33 are connected together by the interlocking of the connecting groove 32 and the connecting protrusion 34, and cannot rotate relative to each other.

[0029] Compared with existing technologies, this equipment has the following significant advantages:

[0030] Multi-layer composite structure improves pipeline performance:

[0031] This equipment adopts a multi-layered composite structure, consisting of a shielding shell 1, a protective padding layer 2, a connecting steel pipe layer 3, an anti-corrosion inner layer 4, and a protective outer shell 5, fully combining the advantages of different materials and layers. This structure is more robust than existing single-layer or simple multi-layer designs, providing stronger protection against pressure, corrosion, and high temperatures, enabling the pipeline to operate stably for a long time even in complex environments.

[0032] Excellent high pressure resistance and corrosion resistance:

[0033] The connecting steel pipe layer 3 of this equipment, through the structural design of the inner and outer steel pipes and the anti-corrosion material of the anti-corrosion inner layer 4, greatly enhances the pipeline's resistance to high pressure and corrosive fluids. Compared with traditional single-layer stainless steel pipes, the composite design can effectively improve corrosion resistance, extend the service life of the equipment, and reduce maintenance costs.

[0034] It has a stronger adaptability to thermal expansion and contraction:

[0035] In the design of the connecting steel pipe layer 3, the sliding connection of the connecting groove 32 and the connecting protrusion 34 effectively alleviates the stress problem caused by thermal expansion and contraction. This design is more flexible than traditional pipes, can adapt to changes in ambient temperature, and avoid pipe deformation, cracks or connection failure caused by thermal expansion and contraction, thus improving the stability and safety of the pipe.

[0036] The structural design improves safety and reliability:

[0037] The dual protection structure formed by the shielding shell 1 and the protective outer shell 5 not only provides physical protection for the internal pipelines, avoiding the effects of external impacts or abrasion, but also effectively blocks the entry of external corrosive substances, reducing the risk of pipeline damage. Compared with existing technologies, this equipment incorporates more safety protection measures in its design, improving overall reliability.

[0038] Enhance the sealing and leakage resistance of pipelines:

[0039] By using a sliding connection design for the connecting steel pipe layer 3, a stable sealing effect is formed between the inner and outer steel pipe layers, making the pipe connection tighter and reducing the risk of water or air leakage. This design not only improves the pipe's sealing performance but also enables it to maintain stable fluid transport function under harsh conditions such as high pressure and high temperature.

[0040] Enhanced flexibility and adaptability:

[0041] The multi-layered structure and flexible connection design of this equipment make it more adaptable and able to cope with complex operating environments. Whether it is high temperature, high pressure, highly corrosive fluids, or places with large temperature differences, the equipment can maintain excellent performance. This allows the equipment to work stably even under conditions where many traditional pipelines cannot operate effectively.

[0042] Reduce maintenance and replacement frequency:

[0043] Because this equipment boasts enhanced durability, corrosion resistance, and the ability to adapt to environmental changes, the probability of pipeline failure or damage during long-term use is lower, thus reducing the frequency of maintenance and replacement and lowering overall operating costs. Compared to traditional technologies, this advantage significantly improves the economics and lifespan of pipelines.

[0044] Summarize:

[0045] This equipment, through its multi-layered composite structure, thermal expansion adaptability design, and enhanced corrosion and high-pressure resistance, offers significant improvements in pipeline safety, reliability, adaptability, and economy compared to existing technologies. These innovations enable the equipment to maintain stable and efficient operation even in harsh working environments, while also offering low maintenance costs and a long service life.

[0046] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipelines, characterized in that: It includes a shielding shell (1), a protective pad (2), a connecting steel pipe layer (3), an anti-corrosion inner layer (4), and a protective outer shell (5), wherein: the protective pad (2) is fixedly installed inside the shielding shell (1), and the connecting steel pipe layer (3) is fixedly installed inside the protective pad (2), and the anti-corrosion inner layer (4) is fixedly installed inside the connecting steel pipe layer (3); the protective outer shell (5) is fixedly installed on the outside of the shielding shell (1).

2. The corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipes as described in claim 1, characterized in that: The shielding shell (1) includes an isolation shell (11), a tensile rib (12) and a compression frame (13), and the tensile rib (12) and the compression frame (13) are fixedly connected together. The tensile rib (12) and the compression frame (13) are fixedly installed inside the isolation shell (11).

3. The corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipes as described in claim 1, characterized in that: The connecting steel pipe layer (3) includes an inner steel pipe (31), a connecting groove (32), an outer steel pipe (33), a connecting ridge (34), and a stabilizing connection groove (35). The connecting groove (32) is located on the outer surface of the inner steel pipe (31). The connecting ridge (34) is located on the inner wall of the outer steel pipe (33). The inner steel pipe (31) and the outer steel pipe (33) are slidably connected together by the connecting groove (32) and the connecting ridge (34). The stabilizing connection groove (35) is located on the outer side of the outer steel pipe (33), and a protective pad (2) is slidably installed on its outer side.

4. The corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipes as described in claim 2, characterized in that: The insulating shell (11) inside the shielding shell (1) adopts a tubular structure made of aluminum silicate fiber, and the tensile rib (12) and the compression skeleton (13) are both made of metal ribs; the direction of the tensile rib (12) is consistent with that of the insulating shell (11), and the compression skeleton (13) is made of metal tube, and the compression skeleton (13) is parallel to the cross section of the insulating shell (11).

5. The corrosion-resistant and high-pressure-resistant composite seamless stainless steel pipe for fluid pipes as described in claim 3, characterized in that: The grooves and protrusions inside the inner steel pipe (31) and outer steel pipe (33) of the connecting steel pipe layer (3) are formed by broaching. A small gap is left between the inner steel pipe (31) and the outer steel pipe (33). The inner steel pipe (31) and the outer steel pipe (33) are connected together by the interlocking of the connecting groove (32) and the connecting protrusion (34) and cannot rotate relative to each other.

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