Wear-resistant and corrosion-resistant composite elbow
Patent Information
- Application Number
- CN202522609916.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-09
AI Technical Summary
[0004]上述方案具有如上优势，但劣势在于，采用陶瓷耐磨贴片与外钢管组合结构，虽可更换贴片降低维护成本，但陶瓷贴片组合贴合性欠佳，易在流体冲击下脱落，外弧中部维修口削弱了结构强度；仅侧重内表面耐磨，缺乏外防护与缓冲减冲击设计，防腐覆盖不全面，难以适配高流速、强腐蚀的严苛工况
1.本实用新型通过设置分流片、缓冲壳与外弯头的协同防护结构，分流片以WC-Co基硬质合金实现流体分流减冲击，缓冲壳采用柔性陶瓷纤维增强橡胶复合材料吸收振动并散热，外弯头与外层保护壳分别以双相不锈钢、氧化铝陶瓷基复合材料构建双重屏障，抵御流体冲刷与介质腐蚀，改善弯头弧度最大区域的集中磨损问题。
Smart Images
Figure CN224904377U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of metal elbow technology, specifically to a wear-resistant and corrosion-resistant composite material elbow. Background Technology
[0002] In fluid transport systems, elbows are key steering components, and their areas with the largest turning radius are susceptible to concentrated fluid impact, leading to severe corrosion and wear, which affects service life. This wear-resistant and corrosion-resistant composite material elbow addresses this core issue through multi-structure collaborative design and compatibility with special composite materials, achieving dual protection against wear and corrosion, adapting to complex working conditions, and extending equipment operating cycles.
[0003] For example, Chinese patent CN220320619U discloses a wear-resistant and corrosion-resistant metal elbow, including an elbow body comprising an inner protective layer and an outer steel pipe. The inner protective layer is formed by combining multiple ceramic wear-resistant patches, and the outer steel pipe has a maintenance port integrally formed in the center of its outer arc. This device adds a replaceable ceramic wear-resistant surface at the center corner arc of the elbow. When the ceramic wear-resistant surface wears down, the bolts can be loosened outwards to open the maintenance cover, allowing the ceramic wear-resistant surface to be removed. Then, the positioning bolts can be removed, allowing the original ceramic wear-resistant surface to be removed and replaced with a new one. After replacement, the maintenance cover can be re-fixed to the maintenance port. This reduces overall downtime for maintenance, and since only the ceramic wear-resistant surface needs to be replaced, it significantly reduces overall maintenance costs while ensuring overall wear and corrosion resistance.
[0004] The above-mentioned solution has the advantages mentioned above, but its disadvantages are that although the combination structure of ceramic wear-resistant patches and outer steel pipe can reduce maintenance costs by replacing the patches, the ceramic patch combination has poor adhesion and is easy to fall off under fluid impact. The maintenance port in the middle of the outer arc weakens the structural strength. It only focuses on the wear resistance of the inner surface and lacks external protection and shock-absorbing design. The anti-corrosion coverage is not comprehensive and it is difficult to adapt to the harsh working conditions of high flow rate and strong corrosion. Summary of the Invention
[0005] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is as follows: a wear-resistant and corrosion-resistant composite material elbow, comprising: an outer elbow, a flow divider, a limiting ring, a buffer shell, an outer protective shell, and side lugs; the flow divider is fixed to the inner wall of the outer elbow and is positioned corresponding to the area with the largest turning radius of the outer elbow; two limiting rings are provided, respectively fixed to the outer walls of both ends of the outer elbow; the buffer shell is sleeved on the outside of the outer elbow and positioned by the limiting rings; the outer protective shell is wrapped around the outside of the buffer shell; the side lugs are symmetrically fixed to the outer walls of both ends of the outer protective shell for locking the outer protective shell. In use, this wear-resistant and corrosion-resistant composite material elbow, through the integrated design of the outer elbow, flow divider, limiting ring, buffer shell, and outer protective shell, forms a multi-layered synergistic protection system, achieving dual protection of wear resistance and corrosion prevention during fluid transportation.
[0006] Preferably, the outer wall of the diverter is fixedly connected to the inner wall of the outer elbow. The diverter is an arc-shaped structure adapted to the curvature of the inner wall of the outer elbow. The diverter is linearly distributed along the radial direction of the region with the maximum curvature of the outer elbow. The outer elbow, as the core matrix of the elbow, is made of duplex stainless steel. This material combines the good toughness of austenitic stainless steel with the high strength of ferritic stainless steel. Furthermore, the addition of alloying elements such as chromium and molybdenum creates a dense passivation film, which helps resist corrosion from acidic, alkaline, and salt-based media. It also exhibits stable mechanical properties and can withstand the impact loads from long-term fluid flow, providing reliable foundation support for the overall structure. The flow divider is fixed in the critical area of the largest turning radius on the inner wall of the outer elbow. It is made of WC-Co based cemented carbide. This composite material uses high-hardness tungsten carbide (WC) as the hard phase and cobalt (Co) with excellent toughness as the binder phase. It is far superior to ordinary metal materials and can resist the erosion and wear of high-speed fluids. At the same time, its arc-shaped structure and reasonable distribution design that are adapted to the curvature of the inner wall of the outer elbow can divide the concentrated flow of fluid into multiple dispersed flows. This helps to reduce the local pressure of the fluid on the concentrated impact area of the elbow and reduce the intensity of erosion and wear from the source. The excellent chemical stability of the cemented carbide itself also prevents the flow divider from self-corrosion failure in corrosive media.
[0007] Preferably, the buffer shell is made of a flexible, wear-resistant buffer material with uniformly distributed perforations on its surface. The inner wall of the buffer shell fits against the outer wall of the outer elbow, and both ends of the buffer shell are engaged with the inner side of the limiting ring. The limiting ring is made of Hastelloy alloy, which has extremely strong corrosion resistance and high-temperature stability, especially exhibiting excellent corrosion resistance to various highly corrosive media. Fixed to the outer walls of both ends of the outer elbow, it not only secures and positions the buffer shell, preventing displacement caused by vibrations from fluid flow and ensuring the stability of the protective structure, but also, through its own corrosion resistance, helps to prevent localized corrosion at the connection points caused by media leakage. The buffer shell is made of flexible ceramic. Ceramic fiber reinforced rubber composite material uses ceramic fiber as a wear-resistant reinforcing phase to improve the surface wear resistance of the material, while the rubber matrix provides it with good flexibility and cushioning properties. It can absorb the vibration energy generated by fluid flow and reduce wear caused by hard impact. At the same time, the uniformly distributed perforated structure on the surface of the buffer shell not only realizes heat dissipation during fluid flow and avoids accelerated material corrosion in high-temperature environments, but also balances the internal and external pressure of the elbow through the air-permeable function, preventing the local accumulation of corrosive media due to pressure difference, and further enhancing the anti-corrosion effect. Its fit design with the outer wall of the outer elbow also forms an additional protective barrier to block the external corrosive environment from eroding the matrix.
[0008] Preferably, the outer protective shell is a hard, wear-resistant shell, with its inner wall fitting snugly against the outer wall of the buffer shell. The outer walls of the side ears are fixedly connected to the outer walls of the outer protective shell and are symmetrically distributed circumferentially along both ends of the outer protective shell. Each side ear has a through hole for locking. The outer protective shell is made of alumina ceramic matrix composite material. Alumina ceramic has hardness and corrosion resistance, and can resist external mechanical impact and corrosion from harsh environments. When fixed through the through holes on the side ears, it provides an outer layer of protection for the entire elbow, which helps to avoid damage to the outer wall of the outer elbow from external factors. The various structures form an organic whole through scientific assembly design. After the fluid flows into the elbow, it is first diverted by the diverter to reduce impact, and then the vibration is absorbed by the flexible buffer shell. The outer elbow matrix resists the action of the medium with its own corrosion and wear resistance. The outer protective shell isolates external erosion, and the limiting ring ensures the stability of the overall structure. The synergistic effect of multiple protection mechanisms improves the problem of concentrated scouring in the area with the largest turning radius of the elbow, and also achieves full-surface anti-corrosion protection, which helps to extend the service life of the elbow under complex working conditions.
[0009] The beneficial effects of this utility model are as follows: 1. This utility model adopts a collaborative protection structure of flow divider, buffer shell and outer elbow. The flow divider is made of WC-Co based hard alloy to achieve fluid diversion and shock reduction. The buffer shell is made of flexible ceramic fiber reinforced rubber composite material to absorb vibration and dissipate heat. The outer elbow and outer protective shell are respectively made of duplex stainless steel and alumina ceramic matrix composite material to build a double barrier to resist fluid erosion and media corrosion, and improve the problem of concentrated wear in the area of maximum elbow curvature.
[0010] 2. This utility model sets up a positioning and locking structure between a limiting ring and a side lug. The limiting ring is fixed to the buffer shell with Hastelloy, and the side lug is made of titanium alloy to lock the outer protective shell. This ensures the overall structural assembly is stable and helps to avoid displacement and failure of the protective components. At the same time, the corrosion and wear resistance of each structural material is outstanding, and the protection covers the inner and outer surfaces, eliminating the need for frequent replacement of vulnerable parts. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the limiting ring of this utility model; Figure 4 This is a schematic diagram of the structure of the flow divider of this utility model.
[0012] In the diagram: 1. Outer elbow; 2. Diverter plate; 3. Limiting ring; 4. Buffer shell; 5. Outer protective shell; 6. Side lug. Detailed Implementation
[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose. Example
[0014] Please see Figure 1 - Figure 4This utility model provides a technical solution: a wear-resistant and corrosion-resistant composite material elbow, comprising: an outer elbow 1, a flow divider 2, a limiting ring 3, a buffer shell 4, an outer protective shell 5, and side ears 6; the flow divider 2 is fixed to the inner wall of the outer elbow 1 and is set in the area with the largest turning arc of the outer elbow 1; two limiting rings 3 are provided, which are respectively fixed to the outer walls of both ends of the outer elbow 1; the buffer shell 4 is sleeved on the outside of the outer elbow 1 and is positioned by the limiting rings 3; the outer protective shell 5 is wrapped around the outside of the buffer shell 4; and the side ears 6 are symmetrically fixed to the outer walls of both ends of the outer protective shell 5 for locking the outer protective shell 5.
[0015] The outer wall of the diverter 2 is fixedly connected to the inner wall of the outer elbow 1. The diverter 2 is an arc-shaped structure adapted to the curvature of the inner wall of the outer elbow 1. The diverter 2 is linearly distributed along the radial direction of the area with the maximum turning curvature of the outer elbow 1.
[0016] The buffer shell 4 is made of flexible and wear-resistant buffer material, and its surface is evenly distributed with through holes. The inner wall of the buffer shell 4 fits against the outer wall of the outer elbow 1, and the two ends of the buffer shell 4 are engaged with the inner side of the limiting ring 3.
[0017] The outer protective shell 5 is a hard and wear-resistant shell. Its inner wall is fitted to the outer wall of the buffer shell 4. The outer wall of the side ear 6 is fixedly connected to the outer wall of the outer protective shell 5 and is symmetrically distributed circumferentially along both ends of the outer protective shell 5. Each side ear 6 has a through hole for locking.
[0018] Working principle: When in use, this wear-resistant and corrosion-resistant composite material elbow, through the integrated design of outer elbow 1, flow divider 2, limiting ring 3, buffer shell 4 and outer protective shell 5, forms a multi-layer synergistic protection system, achieving dual protection of wear resistance and corrosion prevention during fluid transportation.
[0019] The outer elbow 1, as the core component of the elbow, is made of duplex stainless steel. This material combines the good toughness of austenitic stainless steel with the high strength of ferritic stainless steel. Furthermore, the addition of alloying elements such as chromium and molybdenum creates a dense passivation film, which effectively resists corrosion from acids, alkalis, and salts. It also exhibits stable mechanical properties and can withstand the impact loads from long-term fluid flow, providing reliable foundation support for the overall structure. The flow divider 2 is fixed to the critical area with the largest turning radius on the inner wall of the outer elbow 1 and is made of WC-Co based hard alloy. This composite material uses high-hardness tungsten carbide (WC) as the hard phase and cobalt (Co) with excellent toughness as the binder phase. It is far superior to ordinary metal materials and can resist the erosion and wear of high-speed fluids. At the same time, its arc-shaped structure and reasonable distribution design, which are adapted to the curvature of the inner wall of the outer elbow 1, can divert the concentrated flow of fluid into multiple dispersed flows. This helps to reduce the local pressure of the fluid on the concentrated impact area of the elbow and reduce the intensity of erosion and wear from the source. The excellent chemical stability of the hard alloy itself also prevents the diverter plate 2 from self-corrosion failure in corrosive media.
[0020] The limiting ring 3 is made of Hastelloy alloy, which has extremely strong corrosion resistance and high temperature stability. It exhibits excellent corrosion resistance, especially against various highly corrosive media. Fixed to the outer walls of both ends of the outer elbow 1, it not only clamps and positions the buffer shell 4, preventing displacement of the buffer shell 4 caused by vibration generated by fluid flow and ensuring the stability of the protective structure, but also helps to avoid local corrosion caused by media leakage at the connection points through its own corrosion resistance. The buffer shell 4 is made of flexible ceramic fiber reinforced rubber composite material. The ceramic fiber, as a wear-resistant reinforcing phase, helps to improve the surface wear resistance of the material, while the rubber matrix gives it good flexibility and cushioning performance, which can absorb the vibration energy generated by fluid flow and reduce wear caused by hard impact. At the same time, the perforated structure evenly distributed on the surface of the buffer shell 4 not only realizes heat dissipation during fluid flow, preventing the high temperature environment from accelerating material corrosion, but also balances the internal and external pressure of the elbow through the air-permeable function, preventing the local accumulation of corrosive media due to pressure difference, further enhancing the anti-corrosion effect. Its fit design with the outer wall of the outer elbow 1 also forms an additional protective barrier, blocking the external corrosive environment from eroding the matrix.
[0021] The outer protective shell 5 is made of alumina ceramic matrix composite material. Alumina ceramic has hardness and corrosion resistance, and can resist external mechanical impact and corrosion from harsh environments. When fixed through the through hole on the side lug 6, it provides an outer layer of protection for the entire elbow, which helps to avoid damage to the outer wall of the outer elbow 1 from external factors. The various structures form an organic whole through scientific assembly design. After the fluid flows into the elbow, it is first diverted by the flow divider 2 to reduce the impact, and then the vibration is absorbed by the flexible buffer shell 4. The outer elbow 1 matrix resists the action of the medium with its own corrosion resistance and wear resistance. The outer protective shell 5 isolates external erosion, and the limiting ring 3 ensures the stability of the overall structure. The synergistic effect of multiple protection mechanisms improves the problem of concentrated scouring in the area with the largest turning radius of the elbow, and also achieves full-surface anti-corrosion protection, which helps to extend the service life of the elbow under complex working conditions.
[0022] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.
Claims
1. A wear-resistant and corrosion-resistant composite material elbow, characterized in that, include: Outer elbow (1), flow divider (2), limiting ring (3), buffer shell (4), outer protective shell (5), and side lug (6); The diverter plate (2) is fixed to the inner wall of the outer elbow (1) and is set in the area with the largest turning arc of the outer elbow (1); two limiting rings (3) are provided and are fixed to the outer walls of the two ends of the outer elbow (1); the buffer shell (4) is sleeved on the outside of the outer elbow (1) and is positioned by the limiting rings (3); the outer protective shell (5) is wrapped around the outside of the buffer shell (4); the side ears (6) are symmetrically fixed to the outer walls of the two ends of the outer protective shell (5) for locking the outer protective shell (5).
2. The wear-resistant and corrosion-resistant composite material elbow according to claim 1, characterized in that: The outer wall of the diverter (2) is fixedly connected to the inner wall of the outer elbow (1). The diverter (2) is an arc-shaped structure adapted to the curvature of the inner wall of the outer elbow (1). The diverter (2) is linearly distributed in the radial direction along the region of maximum turning curvature of the outer elbow (1).
3. The wear-resistant and corrosion-resistant composite material elbow according to claim 1, characterized in that: The buffer shell (4) is made of flexible wear-resistant buffer material, and its surface is evenly distributed with through holes. The inner wall of the buffer shell (4) is attached to the outer wall of the outer elbow (1), and the two ends of the buffer shell (4) are engaged with the inner side of the limiting ring (3).
4. The wear-resistant and corrosion-resistant composite material elbow according to claim 1, characterized in that: The outer protective shell (5) is a hard wear-resistant shell, and its inner wall is fitted to the outer wall of the buffer shell (4). The outer wall of the side ear (6) is fixedly connected to the outer wall of the outer protective shell (5) and is symmetrically distributed along the circumference of both ends of the outer protective shell (5). Each side ear (6) has a through hole for locking.