Double-layered core pipe

Abstract

The utility model relates to pipeline conveying technical field especially a kind of double-layer structure core pipe material.The core pipe material includes outer protective layer, inner layer and the ceramic ring and graphite ring being set to the inner side of inner layer;Outer protective layer is made of stainless steel alloy, titanium alloy or ceramic coating;Inner layer is composed of polytetrafluoroethylene, ceramic coating or high-temperature-resistant polymer;Ceramic ring and graphite ring are alternately arranged along pipeline axial direction, ceramic ring is trapezoidal ring, graphite ring is provided with the structure of the center recess to water side, and gap is left between the two.The structure improves the high-temperature resistance, corrosion resistance and filtering performance of pipe, and is suitable for fluid conveying scene with high strength and purification demand.

Description

Technical Field

[0001] This utility model relates to the field of pipe structure technology, and more specifically to a double-layer core pipe. Background Technology

[0002] Currently, when transporting fluids in high-temperature, high-pressure, or highly corrosive environments, conventional pipe materials often struggle to simultaneously meet multiple performance requirements, including temperature resistance, corrosion resistance, and wear resistance. To extend equipment lifespan, ensure process safety, and reduce operating costs, functional core pipes with composite structures have gradually emerged in the market. These pipes typically enhance overall performance through a combination of an outer metal protective layer, a middle buffer layer, and an inner functional material layer.

[0003] In the prior art, common core tube structures include:

[0004] Metal-lined composite pipes: These products use stainless steel or alloy metal as the structural strength layer, with a layer of high-molecular materials such as polytetrafluoroethylene (PTFE) or PEEK forming the inner wall through sintering, spraying, or bonding. This structure can improve the chemical stability and anti-adhesion ability of the pipe to a certain extent, but under high temperature or sudden temperature change environments, the high-molecular materials are prone to softening, cracking, or delamination, resulting in a reduced service life.

[0005] All-ceramic or ceramic-lined core tubes: To improve corrosion and wear resistance, some systems use integral ceramic or ceramic coatings as the main pressure-bearing structure or functional inner layer of the core tube. Although ceramic materials have high hardness and excellent corrosion resistance, they are brittle, have poor bending resistance, are difficult to process, and are expensive. They are also prone to cracking or breakage when subjected to external impacts or severe vibrations, which limits their widespread use in complex working conditions.

[0006] Graphite-lined tubes or graphite heat exchange tubes: Graphite materials have good thermal conductivity, high temperature resistance, and chemical stability, and are widely used in some high-temperature or corrosive media transmission processes. Common structures include graphite shell-and-tube heat exchangers and graphite-lined pipes. However, graphite materials have low overall strength, and the processing thickness is limited, which cannot meet the requirements of high-pressure transmission and restricts its application scenarios.

[0007] Porous filter core tubes: In liquid purification or pretreatment stages, some delivery systems employ a structure with a microporous ceramic layer, a foamed metal layer, or a stainless steel filter element inside the core tube to enhance the physical filtration capacity of the fluid. However, common problems with this type of structure include easy clogging, difficulty in cleaning, and the fact that the filtration function and corrosion resistance function are often arranged separately, resulting in a complex structure or increased size, which is not conducive to integrated use.

[0008] In summary, existing core tube structures often struggle to balance corrosion resistance, temperature resistance, pressure resistance, and filtration capacity, making it difficult to meet the long-term stable operation requirements of real-world industrial systems under complex conditions of "high temperature + strong corrosion + high wear + high cleanliness." The failure problem of traditional core tubes is particularly prominent in scenarios involving the alternating transport of multiple complex media, high-frequency operation, or extreme temperature shocks.

[0009] Therefore, designing a compact, high-performance, stable, and reliable core tube system that possesses both excellent temperature and corrosion resistance, as well as multi-stage filtration and fluid control functions, has become one of the key technical problems urgently needing to be solved in this field. Utility Model Content

[0010] To address the problems existing in the prior art, this utility model provides a double-layer core tube, which includes an outer protective layer, an inner layer, and a combination design of alternating ceramic rings and graphite rings. It aims to improve the tube's resistance to external forces, corrosion resistance, high temperature resistance, and filtration capacity, and is particularly suitable for fluid transport systems that require high strength and purification.

[0011] To achieve the above objectives, this utility model provides a double-layer core tube, comprising the following structure:

[0012] External protective layer: The external protective layer is made of high-temperature and corrosion-resistant materials (such as stainless steel alloy, titanium alloy, or ceramic coating). This protective layer has high mechanical strength and corrosion resistance, and is mainly used to prevent the pipe from being subjected to external impact, friction, and chemical corrosion during use.

[0013] Inner layer: The inner layer is made of wear-resistant and corrosion-resistant high-performance materials, such as polytetrafluoroethylene (PTFE), ceramic coating or high-temperature resistant polymer materials, which can effectively resist the corrosion and high-temperature erosion of fluids in the pipeline, and provide better fluid flow performance and reduce frictional resistance.

[0014] Ceramic and graphite rings: On the inner side of the inner layer, ceramic and graphite rings are alternately arranged, maintaining a certain interval between them. This alternating arrangement aims to enhance the filtration effect of the pipe. The ceramic rings possess high strength, wear resistance, and excellent filtration capacity, effectively filtering large particles and contaminants from the water flow. The graphite rings, through their chemical stability, self-lubrication, and good high-temperature resistance, improve the stability of the pipe in high-temperature environments and further enhance its filtration effect.

[0015] Each ceramic ring has a trapezoidal ring structure, which can effectively intercept and filter larger particulate impurities and reduce fluid resistance. The trapezoidal structure design allows water to gradually pass through pores of different sizes during flow, effectively filtering solid particles in the water.

[0016] Each graphite ring has a concave side facing the water flow direction, a design that allows water to contact the graphite rings more evenly as it flows through, improving filtration efficiency and reducing fluid resistance.

[0017] The alternating arrangement of ceramic and graphite rings forms an alternating filter layer structure, with each ceramic ring followed by a graphite ring and a certain gap between the two rings. This effectively enhances the filtration effect of the pipe and also improves the pipe's resistance to high temperatures and corrosion.

[0018] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] (1) Enhanced durability and strength: The material design of the outer protective layer and the inner layer effectively improves the pipe’s resistance to external forces, corrosion resistance and high temperature resistance, making it suitable for long-term use in harsh environments.

[0020] (2) Effective filtration function: The alternating arrangement of ceramic and graphite rings in the center can efficiently filter particulate matter and harmful substances in the water flow. The ceramic rings capture larger particles through their trapezoidal structure, while the graphite rings remove harmful substances from the water through their good self-lubricating and adsorption properties.

[0021] (3) High temperature stability: Graphite rings provide good high temperature resistance, ensuring that the pipeline does not deform or get damaged in high temperature environment, and guaranteeing its long-term stable operation.

[0022] (4) Reduce friction and wear: The self-lubricating properties of graphite reduce friction inside and outside the pipe, reduce wear, and extend the service life of the pipe. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0025] Figure 2 This is an enlarged cross-sectional view of the present invention.

[0026] 1-Outer protective layer, 2-Inner layer, 3-Ceramic ring, 4-Graphite ring. Detailed Implementation

[0027] 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.

[0028] Example

[0029] like Figure 1 and Figure 2 As shown, this utility model provides a double-layer core tube, which mainly includes: an outer protective layer 1, an inner layer 2, a ceramic ring 3, and a graphite ring 4. The core tube has a clear hierarchical structure with coordinated components, effectively improving its overall performance under complex working conditions. It is suitable for fluid transport systems requiring high temperature, high corrosion, strong wear, and filtration.

[0030] The outer protective layer 1 is located on the outermost side of the core tube. Its material can be stainless steel alloy, titanium alloy, or other metallic materials with excellent corrosion resistance and mechanical strength. A ceramic layer can also be sprayed or sintered onto its surface to enhance its high-temperature resistance and wear resistance. This protective layer is primarily used to withstand external physical impacts, pressure, and chemical corrosion, ensuring the long-term stable operation of the entire core tube in harsh environments.

[0031] For example, in industrial systems that transport highly corrosive acid or alkali solutions or high-pressure steam, the outer protective layer 1 can effectively prevent external chemicals from corroding the inner layer and internal functional components (such as ceramic and graphite rings), extending their service life. Furthermore, the metal protective layer possesses good bending and deformation resistance, allowing it to withstand certain impacts and vibrations during construction or pipeline operation.

[0032] The inner layer 2 is disposed inside the outer protective layer 1 and is coaxially connected with the outer protective layer to form a composite layered structure. The inner layer 2 is made of high-performance corrosion-resistant materials, such as polytetrafluoroethylene (PTFE), ceramic coating, or other high-temperature resistant engineering plastic materials.

[0033] Polytetrafluoroethylene (PTFE) possesses excellent chemical stability, a low coefficient of friction, and self-lubricating properties, making it suitable for use in fluid channel structures. It helps reduce frictional resistance of fluids on the inner wall of pipes, improving transport efficiency, while also resisting corrosion from various chemical media. When high-temperature and high-pressure media pass through, the inner layer can form a stable protective interface, preventing damage to the inner wall of the pipe due to high-temperature erosion or corrosion.

[0034] In addition, when conveying highly viscous fluids with adhesive properties, this inner layer structure can effectively inhibit material from adhering to the pipe wall, reduce the risk of scaling and blockage, and extend the pipeline cleaning cycle.

[0035] The ceramic ring 3 is installed on the inner side of the inner layer 2, arranged along the axial direction of the core tube, and has a trapezoidal ring structure. It is made of high-strength alumina, silicon nitride and other engineering ceramics, and has the characteristics of wear resistance, corrosion resistance, high hardness and high strength.

[0036] Each ceramic ring 3 has a trapezoidal cross-section with gradually changing dimensions in the thickness direction, which guides the fluid to varying degrees as it passes through. The ceramic ring can also be provided with several micropores or through-holes extending radially or axially. These micropores, with varying diameters, form multi-stage filtration channels, which help to intercept suspended particles, colloids, and microscopic impurities in the fluid, thus improving the purification effect.

[0037] Furthermore, ceramic materials exhibit excellent high-temperature stability, enabling continuous operation at temperatures exceeding 1000°C. Their high surface hardness allows them to remain stable under conditions of fluids containing sand or solid particles, resisting wear and significantly enhancing the overall durability and stability of the piping system.

[0038] Graphite rings 4 are positioned between every two ceramic rings, also arranged along the axial direction, alternating with the ceramic rings. The graphite rings 4 are formed by pressing high-purity graphite or expanded graphite material, possessing excellent chemical stability, high-temperature resistance, and self-lubricating properties.

[0039] Unlike ceramic rings, the water-facing surface (the surface the fluid first contacts) of each graphite ring 4 is designed as a concave arc-shaped structure towards the center of the pipe. This structure creates a local low-pressure zone and flow channel as the fluid flows through, allowing the fluid to be evenly distributed as it passes through the graphite ring. This facilitates full contact of subsequent filter materials, thereby improving filtration efficiency and reducing turbulence.

[0040] The curved structure of graphite ring 4 also helps reduce the impact force of fluids and alleviate wear problems caused by high-speed flow. Simultaneously, graphite materials possess excellent adsorption properties, capable of adsorbing some organic pollutants and fine impurities, further enhancing the filtration function. During the transport of fluids containing corrosive substances (such as strong acids or organic solvents), the graphite rings maintain a stable physical structure and are not easily corroded or damaged.

[0041] Ceramic rings 3 and graphite rings 4 are arranged alternately along the axial direction of the pipe, with each ceramic ring maintaining a gap of 1 to 5 mm between it and the adjacent graphite ring. Preferably, each pipe section has at least 3 cycles (i.e., ceramic rings + graphite rings) of structural units to ensure sufficient filtration stages and functional area superposition.

[0042] This alternating arrangement creates a multi-stage, progressive filtration and corrosion-resistant protection system. Ceramic rings intercept large particles, while graphite rings optimize flow rate, buffer water flow, and adsorb fine contaminants, achieving a synergistic effect of physical filtration and chemical stabilization. The interstitial areas also serve as sedimentation buffer zones, allowing some fine particles to remain and settle, reducing the risk of system clogging.

[0043] Furthermore, this alternating structure can be flexibly adapted to different fluid types and operating conditions by adjusting the length, spacing, and number of each ring. For example, in high-temperature and high-pressure systems, the density of ceramic rings can be increased to improve temperature and pressure resistance; in scenarios requiring stronger purification capabilities, the number of graphite rings can be increased and their length extended.

[0044] 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 double-layer core tube, characterized in that, include: The outer protective layer (1), the inner layer (2), the ceramic ring (3), and the graphite ring (4) are all present. The inner layer (2) is fitted inside the outer protective layer (1); The ceramic ring (3) and the graphite ring (4) are disposed on the inner side of the inner layer (2) and are arranged alternately along the axial direction of the tube, with a gap between the ceramic ring (3) and the graphite ring (4); The ceramic ring (3) has a trapezoidal ring structure; The graphite ring (4) has an arc surface that is recessed toward the center of the pipe on the water-facing side.

2. The double-layer core tube according to claim 1, characterized in that: The outer protective layer (1) is made of stainless steel alloy, titanium alloy or metal with ceramic material sprayed on the surface.

3. The double-layer core tube according to claim 1, characterized in that: The inner layer (2) is made of polytetrafluoroethylene, ceramic coating material or high-temperature resistant polymer material.

4. The double-layer core tube according to claim 1, characterized in that: The ceramic ring (3) has multiple through holes on its inner side, and the diameter of the through holes gradually decreases along the thickness direction of the ceramic ring (3).

5. The double-layer core tube according to claim 1, characterized in that: The graphite ring (4) is made of high-purity graphite or expanded graphite.

6. The double-layer core tube according to claim 1, characterized in that: The axial gap between the ceramic ring (3) and the graphite ring (4) is 1 to 5 mm.

7. The double-layer core tube according to claim 1, characterized in that: The alternating structure of the ceramic ring (3) and the graphite ring (4) is continuously arranged in the axial direction for no less than three cycles inside the tube.

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