Wear-resistant composite ceramic elbow

Abstract

The utility model relates to elbow pipe technical field, concretely is a kind of wear-resistant composite ceramic elbow pipe. Including ceramic layer and metal shell layer that are sequentially compounded from inside to outside, resin layer is arranged between ceramic layer and metal shell layer, in the back arc wear area of elbow, ceramic layer integrally formed has the ceramic wear-resistant thickening block that protrudes to flow channel inside side, the inner surface of ceramic wear-resistant thickening block and the remaining inner surface of ceramic layer smooth transition. Through the ceramic wear-resistant thickening block design of integrally formed, the material thickness of most easily worn area can be targetedly enhanced, help to improve the impact resistance of this area;Integral ceramic layer structure avoids the interface drop-off problem that the interface drop-off problem that sheet lining can exist, help to keep the integrity of lining structure;The composite structure of ceramic layer, resin layer and metal shell layer, the internal stress generated due to the difference of material physical properties can be coordinated, provide support and protection for wear-resistant lining.

Description

Technical Field

[0001] This utility model relates to the field of pipe bending technology, specifically a wear-resistant composite ceramic pipe bending device. Background Technology

[0002] In pneumatic conveying systems in industries such as power, metallurgy, and chemicals, bends are key components for changing the conveying direction of powdery and granular materials. During operation, high-speed flowing solid particles (such as coal powder and mineral powder) continuously impact the back arc side of the bend, making this area the weakest link in the entire conveying pipeline, most susceptible to wear. The wear resistance and service life of the bend directly affect the operational stability and maintenance costs of the production system.

[0003] Currently, common methods to improve the wear resistance of bends include using integrally cast wear-resistant alloy bends or lining the inner wall of steel pipes with wear-resistant ceramic sheets. While integrally cast bends possess a certain degree of toughness, their hardness and wear resistance remain insufficient under certain high-wear conditions. Ceramic-lined bends, although having high surface hardness, may suffer from ceramic sheet breakage and adhesive failure leading to detachment under long-term strong impacts. Furthermore, composite structures composed of different materials may face challenges to interfacial bonding stability under temperature changes and mechanical vibration conditions due to differences in physical properties such as the coefficient of thermal expansion between the materials. Utility Model Content

[0004] The present invention aims to solve the above problems, thereby providing a more stable and wear-resistant composite ceramic bend.

[0005] The technical solution adopted by this utility model to solve the aforementioned problem is: A wear-resistant composite ceramic bend includes a ceramic layer and a metal outer shell layer sequentially laminated from the inside to the outside. A resin layer is disposed between the ceramic layer and the metal outer shell layer. In the back arc wear area of ​​the bend, the ceramic layer is integrally formed with a ceramic wear-resistant thickened block protruding towards the inside of the flow channel. The inner surface of the ceramic wear-resistant thickened block smoothly transitions with the rest of the inner surface of the ceramic layer.

[0006] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are: The one-piece molded ceramic wear-resistant thickened block design can specifically enhance the material thickness of the most wear-prone areas, which helps to improve the impact resistance of these areas; the overall ceramic layer structure avoids the interface detachment problem that may exist in sheet linings, which helps to maintain the integrity of the inner lining structure; the composite structure of ceramic layer, resin layer and metal shell layer can coordinate the internal stress caused by the difference in material physical properties, providing support and protection for wear-resistant inner lining.

[0007] As a preferred embodiment, a further technical solution of this utility model is: Furthermore, a high-elasticity rubber buffer layer is provided between the ceramic layer and the resin layer, and at the back arc corresponding to the bend. The high-elasticity rubber buffer layer can absorb and buffer part of the energy of the material impact, reduce the direct transmission of impact stress to the ceramic layer, help reduce the risk of brittle fracture or fatigue damage to the ceramic layer under repeated impacts, and play a certain protective role for the ceramic layer.

[0008] Furthermore, in the longitudinal section passing through the axis of the elbow, the profile of the ceramic wear-resistant thickened block is composed of straight segments inclined relative to the direction of the fluid inlet. The profile of the straight segments can guide the impacting material, so that the impact direction of the material forms a certain angle with the surface of the thickened block, which helps to convert part of the vertical impact force into shear force along the surface, thereby potentially reducing the intensity of the impact and improving the impact resistance of the thickened block.

[0009] Furthermore, the angle formed by the straight section and the central axis of the fluid inlet of the elbow is 30-60°. This angle range can achieve a relative balance between guiding the material and effectively bearing the impact force. If the angle is too small, the guiding effect will not be obvious, and if the angle is too large, it may weaken the support of the thickened block itself.

[0010] Furthermore, an included angle of 45° is a preferred option, providing a feasible implementation in terms of achieving effective material guidance and maintaining structural strength. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main cross-sectional structure of an embodiment of the present utility model; The layers in the diagram are labeled as follows: 1. Ceramic layer; 2. Metal outer shell layer; 3. Resin layer; 4. Ceramic wear-resistant thickened block; 5. High-elastic rubber buffer layer. Detailed Implementation

[0012] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0013] A wear-resistant composite ceramic bend includes a ceramic layer 1 and a metal outer shell layer 2 sequentially composited from the inside out. A resin layer 3 is disposed between the ceramic layer 1 and the metal outer shell layer 2. The metal outer shell layer 2 constitutes the main structural body of the bend and its material can be carbon steel or low alloy steel. The ceramic layer 1 is bonded and fixed to the inner wall of the metal outer shell layer 2 by the resin layer 3, which is epoxy resin or polyurethane resin. In the back arc wear area of ​​the bend, the ceramic layer 1 has an integrally formed ceramic wear-resistant thickened block 4 protruding towards the inside of the flow channel. The inner surface of the ceramic wear-resistant thickened block 4 smoothly transitions with the rest of the inner surface of the ceramic layer 1. The ceramic layer 1 and the ceramic wear-resistant thickened block 4 are preferably made of alumina, silicon carbide or zirconium oxide ceramics and integrally sintered after isostatic pressing or dry pressing.

[0014] Furthermore, a high-elastic rubber buffer layer 5 is provided between the ceramic layer 1 and the resin layer 3, corresponding to the back arc of the elbow. The high-elastic rubber buffer layer 5 is preferably a nitrile rubber or polyurethane rubber layer. The high-elastic rubber buffer layer 5 can absorb and buffer part of the energy of the material impact, reduce the direct transmission of impact stress to the ceramic layer 1, and help reduce the risk of brittle fracture or fatigue damage of the ceramic layer 1 under repeated impacts, thus playing a certain protective role for the ceramic layer 1.

[0015] Furthermore, in the longitudinal section passing through the elbow axis, the profile of the ceramic wear-resistant thickened block 4 is composed of straight line segments inclined relative to the fluid inlet direction. Based on this, the three-dimensional shape of the ceramic wear-resistant thickened block 4 has the expected mainstream impact center as the thickest point. The thickness of the thickest point of the ceramic wear-resistant thickened block 4 is 1.5-3 times the reference thickness of the adjacent ceramic layer 1. Its thickness decreases smoothly along the axial direction and circumferential direction of the bend, forming a reinforcement that matches the back arc wear zone. The ceramic wear-resistant thickened block 4 covers 60%-80% of the bending angle of the bend. The straight line segment profile can guide the impacting material, so that the impact direction of the material forms a certain angle with the surface of the thickened block, which helps to convert part of the vertical impact force into shear force along the surface, thereby potentially reducing the intensity of the impact and improving the impact resistance of the ceramic wear-resistant thickened block 4.

[0016] Furthermore, the angle formed by the straight section and the central axis of the fluid inlet of the elbow is 30-60°. This angle range can achieve a relative balance between guiding the material and effectively bearing the impact force. If the angle is too small, the guiding effect will not be obvious, and if the angle is too large, it may weaken the support of the ceramic wear-resistant thickened block 4 itself.

[0017] Furthermore, an included angle of 45° is a preferred option, providing a feasible implementation in terms of achieving effective material guidance and maintaining structural strength.

[0018] The design of the integrally molded ceramic wear-resistant thickened block 4 can specifically enhance the material thickness of the most wear-prone areas, which helps to improve the impact resistance of these areas; the integral ceramic layer 1 structure avoids the interface detachment problem that may exist in sheet linings, which helps to maintain the integrity of the inner lining structure; the composite structure of ceramic layer 1, resin layer 3 and metal shell layer 2 can coordinate the internal stress caused by the difference in material physical properties, providing support and protection for the wear-resistant inner lining.

[0019] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A wear-resistant composite ceramic bend, comprising a ceramic layer and a metal outer shell layer sequentially laminated from the inside out, characterized in that: A resin layer is provided between the ceramic layer and the metal shell layer. In the back arc wear area of ​​the elbow, the ceramic layer is integrally formed with a ceramic wear-resistant thickened block protruding towards the inside of the flow channel. The inner surface of the ceramic wear-resistant thickened block smoothly transitions with the rest of the inner surface of the ceramic layer.

2. The wear-resistant composite ceramic bend according to claim 1, characterized in that: A high-elastic rubber buffer layer is provided between the ceramic layer and the resin layer, and at the back arc corresponding to the elbow.

3. The wear-resistant composite ceramic bend according to claim 1, characterized in that: In a longitudinal section passing through the axis of the elbow, the profile of the ceramic wear-resistant thickened block is formed by straight line segments inclined relative to the direction of the fluid inlet.

4. The wear-resistant composite ceramic bend according to claim 3, characterized in that: The angle between the straight section and the central axis of the fluid inlet of the elbow is 30-60°.

5. The wear-resistant composite ceramic bend according to claim 4, characterized in that: The included angle is 45°.

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