Wear-resistant elbow

Abstract

The application discloses a wear-resistant elbow pipe, which comprises an inlet straight pipe, a gradually expanding pipe connected to a gas outlet end of the inlet straight pipe and gradually expanding in diameter along a gas flow direction, an elbow pipe with a gas inlet end connected to a diameter expanding end of the gradually expanding pipe, a gradually reducing pipe connected to a gas outlet end of the elbow pipe and gradually reducing in diameter along the gas flow direction, an outlet straight pipe with a gas inlet end connected to a diameter reducing end of the gradually reducing pipe, and a ribbed stiffener connected to an inner wall of a curved outer side of the elbow pipe. The gradually expanding pipe and the gradually reducing pipe are arranged to increase the flow area at the elbow pipe, slow down the gas flow at the elbow pipe, reduce the speed of dust particles, and reduce the wear of the inner wall of the elbow pipe caused by the dust particles. The ribbed stiffener is connected to the inner wall of the curved outer side of the elbow pipe to further reduce the probability of the impact of the dust particles on the outer side wall of the elbow pipe, reduce the wear of the outer side wall of the elbow pipe, and increase the wear resistance of the curved outer side of the elbow pipe.

Description

Technical Field

[0001] This invention relates to the field of pipe wear resistance technology, and in particular, to a wear-resistant bend. Background Technology

[0002] Pipeline wear in dust collection systems typically occurs at points where airflow changes, such as bends and tees. In these systems, dust-laden gas generally travels at speeds of 15-20 m / s within the pipes. When the flue gas flow direction changes, dust particles in the flue gas erode the pipes due to inertia, while complex turbulence occurs inside the bends. Over time, the outer arc surface of the bend wears down, thinning and even wearing through, directly affecting the safe operation of the dust collection system. Furthermore, air leakage caused by wear also impacts the dust collection efficiency, leading to environmental pollution and resource waste. Improving bend wear primarily involves modifying process conditions, altering external structures, and using new wear-resistant materials; however, these methods are limited by factors such as process conditions and price.

[0003] Traditional solutions involve applying wear-resistant materials inside the pipe at the bend or creating a wear-resistant backing on the outside of the bend. However, these methods do not fundamentally change the wear rate at the bend. After a period of time, the bend is still easily worn through, and the dust collection system often needs to be shut down to replace the bend or fill the holes, resulting in time and economic losses. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a wear-resistant elbow that can reduce elbow wear and lower the frequency of elbow replacement.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A wear-resistant bend includes: an inlet straight pipe; a diffuser connected to the outlet end of the inlet straight pipe, with its diameter gradually increasing along the airflow direction; a bend, with its inlet end connected to the diameter-expanding end of the diffuser; a converging pipe connected to the outlet end of the bend, with its diameter gradually decreasing along the airflow direction; an outlet straight pipe, with its inlet end connected to the diameter-reducing end of the converging pipe; and reinforcing ribs connected to the inner wall of the outer side of the bend.

[0006] Furthermore, the inner wall contour of the outlet end of the inlet straight pipe forms a first projection area in the first plane, and the inner wall contour of the inlet end of the bend pipe forms a second projection area in the first plane. The center of the second projection area is offset from the center of the first projection area in a direction away from the curvature center of the bend pipe, and the first plane is perpendicular to the airflow direction of the inlet straight pipe.

[0007] Furthermore, the inner wall contour of the air inlet end of the outlet straight pipe forms a third projection area in the second plane, and the inner wall contour of the air outlet end of the bend pipe forms a fourth projection area in the second plane. The center of the fourth projection area is offset from the center of the third projection area in a direction away from the curvature center of the bend pipe, and the second plane is perpendicular to the airflow direction of the outlet straight pipe.

[0008] Furthermore, the outlet straight pipe and the inlet straight pipe have the same diameter, and the eccentricity of the center of the second projection area relative to the center of the first projection area is equal to the eccentricity of the center of the fourth projection area relative to the center of the third projection area.

[0009] Furthermore, the third projection area is located within the fourth projection area, and the first projection area is located within the second projection area.

[0010] Furthermore, the boundary of the third projection region is tangent to the boundary of the fourth projection region, and the boundary of the first projection region is tangent to the boundary of the second projection region.

[0011] Furthermore, the reinforcing ribs are arranged at intervals along the extension direction of the bend, and a dust particle accommodating space is defined between two adjacent reinforcing ribs and the inner wall of the bend. The dust particle accommodating space is used to collect dust particles to form a dust particle layer.

[0012] Furthermore, a magnetic component is installed on the outer wall of the curved outer side of the pipe, so that the dust particle layer is adsorbed and adhered to the inner wall of the curved outer side of the pipe.

[0013] Furthermore, the pipe erosion rate at the bend... Satisfy the following formula: ; ; The erosion rate at the bend in the pipe is given. The particle flow rate at the bend in the pipe. The velocity of the mixed fluid at the bend in the pipe. Where is the pipe diameter of the bend. The density of the mixed fluid at the bend in the pipe. It is a geometric constant. The particle size is denoted as .

[0014] Furthermore, the reinforcing rib is a semi-circular arc-shaped strip.

[0015] The present invention has the following beneficial effects: By using the expansion and contraction tubes, the flow area at the bend is increased, and the airflow speed at the bend is slowed down, thereby reducing the speed of dust particles and reducing the wear of dust particles on the inner wall of the bend. The reinforcing ribs are connected to the inner wall of the outer side of the bend, reducing the probability of dust particles impacting the outer wall of the bend, reducing the wear of the outer wall of the bend, and increasing the wear resistance of the outer side of the bend.

[0016] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 yes Figure 1 Sectional view at point AA; Figure 3 This is a schematic diagram of the first projection area, the second projection area, the third projection area, and the fourth projection area; Figure 4 This is an isometric view of an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure in a practical state according to an embodiment of the present invention; Figure 6 yes Figure 5 Enlarged view of point B; Figure 7 This is a schematic diagram of another embodiment of the present invention; Figure 8 yes Figure 7 Enlarged view at point C; Figure 9 This is a schematic diagram of another embodiment of the present invention; Figure 10 This is a schematic diagram of the results of the wear-resistant reinforcement. Figure 11 yes Figure 9 A schematic diagram illustrating the working principle.

[0018] Legend: Imported straight pipe 100, first projection area 110; 200mm diffuser tube; Bending pipe 300, dust particle containing space 301, dust particle layer 302, second projection area 310, fourth projection area 320; 400 tapered tube; Export straight pipe 500, third projection area 510; 600 reinforced ribs; Magnetic component 700; Wear-resistant reinforcing component 800, sealed cavity 801, dust particle accumulation layer 802, outer arc-shaped protective plate 810, inner arc-shaped protective plate 820, frame 830, first rib 831, second rib 832. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0023] Please refer to Figures 1 to 4 A preferred embodiment of the present invention provides a wear-resistant bend pipe, comprising an inlet straight pipe 100, a gradually expanding pipe 200, a bend pipe 300, a gradually narrowing pipe 400, an outlet straight pipe 500, and a reinforcing rib 600.

[0024] like Figure 1As shown, in this embodiment, the inlet straight pipe 100 is horizontally arranged, with one end as the air inlet and the other end as the air outlet. The diffuser 200 is connected to the air outlet of the inlet straight pipe 100, and the diameter of the diffuser 200 gradually increases along the airflow direction. The bend 300 is formed by bending and extending along a curvature center, with one end as the air inlet and the other end as the air outlet. The air inlet of the bend 300 is connected to the diameter-enlarging end of the diffuser 200, that is, the air inlet of the bend 300 is connected to the air outlet of the diffuser 200. The converging pipe 400 is connected to the air outlet of the bend 300, and its diameter gradually decreases along the airflow direction. The outlet straight pipe 500 has one end as the air inlet and the other end as the air outlet. The air inlet of the outlet straight pipe 500 is connected to the diameter-reducing end of the converging pipe 400, that is, the air inlet of the outlet straight pipe 500 is connected to the air outlet of the converging pipe 400. Specifically, the inlet straight pipe 100, the diffuser 200, the bend 300, the reducer 400, and the outlet straight pipe 500 are connected end to end along the airflow direction to form an airflow transport channel. The connections are typically welded together. A reinforcing rib 600 is connected to the inner wall of the outer side of the bend 300. The outer side of the bend 300 refers to the side of the bend 300 facing away from the center of curvature; this side is prone to wear.

[0025] The present invention utilizes the arrangement of the expanding tube 200 and the contracting tube 400 to increase the flow area at the bend 300 and slow down the airflow velocity at the bend 300, thereby reducing the velocity of dust particles and reducing the wear of dust particles on the inner wall of the bend. The reinforcing ribs 600 are connected to the inner wall of the outer side of the bend 300, reducing the probability of dust particles impacting the outer wall of the bend, reducing the wear of the outer wall of the bend, and increasing the wear resistance of the outer side of the bend 300.

[0026] Reference Figure 2 The reinforcing rib 600 is a semi-circular arc-shaped strip, which is specifically designed for the wear-prone areas of the bend 300, reducing material waste while ensuring structural reinforcement of the wear-prone areas of the bend 300.

[0027] Reference Figure 2In some embodiments of the present invention, the inner wall contour of the outlet end of the inlet straight pipe 100 forms a first projection area 110 in a first plane, and the inner wall contour of the inlet end of the bend pipe 300 forms a second projection area 310 in the first plane. It is understood that both the inlet straight pipe 100 and the bend pipe 300 have circular cross-sections, and both the first projection area 110 and the second projection area 310 are circular areas. The center of the second projection area 310 is offset from the center of the first projection area 110 in a direction away from the curvature center of the bend pipe 300. The first plane is perpendicular to the airflow direction of the inlet straight pipe 100. That is, compared to the concentric arrangement of the bend pipe and the inlet straight pipe 100, in this embodiment, the outer curved side of the bend pipe 300 is offset outwards, so that the airflow and dust entering through the inlet straight pipe 100 are kept as far away as possible from the outer curved side of the bend pipe 300, reducing wear.

[0028] In a further embodiment of the present invention, the inner wall profile of the inlet end of the outlet straight pipe 500 forms a third projection region 510 in the second plane, and the inner wall profile of the outlet end of the bent pipe 300 forms a fourth projection region 320 in the second plane. It is understood that both the outlet straight pipe 500 and the bent pipe 300 have circular cross-sections, and both the third projection region 510 and the fourth projection region 320 are circular regions. The center of the fourth projection region 320 is offset from the center of the third projection region 510 in a direction away from the curvature center of the bent pipe 300, and the second plane is perpendicular to the airflow direction of the outlet straight pipe 500. This ensures that the airflow exiting the outlet straight pipe 500 is as far away as possible from the outer curved side of the bent pipe 300, and that the airflow and dust entering the outlet straight pipe 500 are kept as far away as possible from the outer curved side of the bent pipe 300, reducing wear.

[0029] The eccentric setting of the second projection area 310 and the fourth projection area 320 is to keep the wear-prone parts of the bend 300 as far away from the airflow path as possible, so that less dust comes into contact with the inner wall of the bend outside the bend of the bend 300, thereby reducing wear.

[0030] In a specific embodiment of the present invention, the outlet straight pipe 500 and the inlet straight pipe 100 have the same diameter, both being D2. The eccentricity of the center of the second projection area 310 relative to the center of the first projection area 110 is equal to the eccentricity of the center of the fourth projection area 320 relative to the center of the third projection area 510, both being L. This makes the structure symmetrical, allowing the expanding pipe 200 and the contracting pipe 400 to be shared, increasing the interchangeability of components and reducing processing costs.

[0031] Reference Figure 3In a further embodiment of the present invention, the third projection area 510 is within the fourth projection area 320, and the first projection area 110 is within the second projection area 310. This allows the airflow entering through the inlet straight pipe 100 and the airflow exiting through the outlet straight pipe 500 to flow smoothly without being obstructed by the end difference at the pipe connection, while also reducing wear on the inner wall of the pipe. For example, if the first projection area 110 is not within the second projection area 310, it indicates that the outlet end of the inlet straight pipe 100 and the inlet end of the bend pipe 300 are not aligned, and there is a partially completely misaligned area. This causes some airflow to not directly and smoothly enter the bend pipe 300, but to be guided by the inner wall of the diffuser 200 before entering the bend pipe 300. During this process, some airflow and the dust particles it carries will cause wear on the inner wall of the diffuser 200, easily causing damage to the diffuser 200.

[0032] like Figure 3 As shown, in a further embodiment of the present invention, the boundary of the third projection region 510 is tangent to the boundary of the fourth projection region 320, and the boundary of the first projection region 110 is tangent to the boundary of the second projection region 310. Thus, while the third projection region 510 is within the fourth projection region 320 and the first projection region 110 is within the second projection region 310, the eccentricity is maximized as much as possible, so that the inner wall of the outer side of the bend 300 is far away from the airflow path, reducing contact with dust particles and further reducing wear.

[0033] Reference Figure 5 The reinforcing ribs 600 are arranged at intervals along the extension direction of the bend 300. A dust particle containing space 301 is defined between two adjacent reinforcing ribs 600 and the inner wall of the bend 300. The dust particle containing space 301 is used to collect dust particles to form a dust particle layer 302. Figure 6 As shown, the elbow is eccentrically positioned at both ends, causing it to move backward away from the center of curvature. A vortex zone is formed in the wear-prone area of ​​the elbow (near the outer side of the bend), where dust is deposited on the outer side of the bend. The dust accumulates in the dust particle holding space 301, forming a dust particle layer 302. The dust particle layer 302 prevents the dust particles impacting from behind from directly contacting the inner wall of the elbow 300. Instead, it isolates and buffers the particles, forming abrasive material that blocks the impact of particles from behind on the inner wall of the outer side of the elbow 300, further reducing the erosion and wear of the inner wall of the outer side of the elbow 300.

[0034] Reference Figure 7 and Figure 8In a further embodiment of the present invention, a magnetic element 700 is installed on the outer wall of the curved outer side of the bend 300, thereby causing the dust particle layer 302 to adhere to the inner wall of the curved outer side of the bend 300. This ensures that the dust particles do not accumulate solely due to the support of the reinforcing ribs 600. The magnetic element 700 enhances the adsorption capacity of the dust particle layer 302 on the curved outer side of the bend 300, and the magnetic force also increases the area on which it adheres to the curved outer side of the bend 300, thereby increasing the protective area on the curved outer side of the bend 300 and further reducing wear.

[0035] Reference Figures 9 to 11 In another embodiment of the present invention, a wear-resistant reinforcing member 800 is also provided.

[0036] A wear-resistant reinforcing member 800 is installed on the outer side of the bend of the bend 300, forming a sealed cavity. The wear-resistant reinforcing member 800 includes an outer arc-shaped protective plate 810, an inner arc-shaped protective plate 820, and a frame 830. The inner arc-shaped protective plate 820 is attached to and fixed to the outer side of the bend 300, usually by welding. The inner arc-shaped protective plates 820 are spaced apart on the outer side of the outer arc-shaped protective plates 810, forming a cavity around them. The frame 830 is located between the outer arc-shaped protective plates 810 and the inner arc-shaped protective plates 820. The cavity is divided into multiple sealed compartments 801 by the frame 830. The sealed compartments 801 are arranged in an array and are independent of each other. The cross-sectional profiles of the outer arc-shaped protective plates 810 and the inner arc-shaped protective plates 820 are semi-circular.

[0037] The wear-resistant reinforcement 800 not only increases the thickness of the wear-resistant material, but more importantly, it forms a sealed cavity 801 on the outer side of the bend of the bend 300. This allows a gap to be formed in the sealed cavity 801 after the outer wall of the bend 300 and the outer arc-shaped protective plate 810 are worn through. Airflow and particles will enter the sealed cavity 801 through the gap. However, since the sealed cavity 801 only has a gap in the outer wall of the bend 300 and the outer arc-shaped protective plate 810, the airflow and particles entering will create a positive pressure in the sealed cavity 801, which will obstruct the subsequent airflow. An air wall is formed at the gap in the sealed cavity 801, which slows down the speed of the airflow and particles, thereby effectively reducing the wear of particles on the outer arc-shaped protective plate 810, further reducing wear, and improving the wear life. In addition, the skeleton 830 divides the cavity into multiple independent small cavities, so that the capacity of each independent sealed cavity 801 is greatly reduced compared to the cavity. As a result, when the outer wall of the bent tube 300 is worn through, due to the small capacity of the sealed cavity 801, a large positive pressure will be quickly formed. The air wall formed at the gap has a better effect on blocking airflow and particles, reducing the speed at which particles enter the sealed cavity 801, reducing the wear of particles on the material, and improving wear resistance and service life.

[0038] In addition, the sealed cavity 801 can also be used to receive dust particles that enter after the inner arc-shaped protective plate 820 is worn through by dust particles, and gradually form a dust particle accumulation layer 802 within the sealed cavity 801. The dust particle accumulation layer 802 is used to buffer some of the dust particles entering the sealed cavity 801 and reduce the probability of dust particles directly colliding with the outer arc-shaped protective plate 810. Figure 11 As shown, when both the bend 300 and the inner arc-shaped protective plate 820 are worn through by dust particles, the sealed cavity 801 will be exposed. Dust particles and airflow will enter the sealed cavity 801, creating positive pressure and an air wall to slow down the dust particles. The dust particles will accumulate at the bottom of the sealed cavity 801, forming a dust particle accumulation layer 802. Some dust particles will impact the dust particle accumulation layer 802 after entering. It can buffer incoming dust particles, preventing them from directly impacting the inner arc-shaped protective plate 820, thus greatly reducing wear on the outer arc-shaped protective plate 810. The sealed cavity 801 uses the dust particle accumulation layer 802 formed by the accumulated dust particles to buffer subsequent impacts, greatly reducing wear on the material, effectively improving wear resistance, and extending wear life without increasing material thickness or the wear resistance of the material itself.

[0039] Specifically, the frame 830 includes a first rib 831 and a second rib 832. The second rib 832 extends along the circumferential contour of the bent pipe 300, and the first rib 831 extends along the bending direction of the bent pipe 300. The first rib 831 and the second rib 832 are arranged circumferentially along the bent pipe 300, and are arranged along the bending direction of the bent pipe 300. The first rib 831 and the second rib 832 are arranged in two different directions and intersect to form a grid, thereby forming a matrix-arranged closed cavity 801. The first rib 831 and the second rib 832 are intersected and connected. The closed cavity 801 is defined by the first rib 831, the second rib 832, the outer arc-shaped protective plate 810, and the inner arc-shaped protective plate 820. The first rib 831 and the second rib 832 are intersected to divide the cavity into sealed compartments 801, and adjacent sealed compartments 801 are separated independently by the first rib 831 and the second rib 832. The second rib 832 is arranged around the center of curvature of the bend 300, and the spacing is the same as that of the reinforcing ribs 600. Figure 11 As shown, the second rib 832 is aligned with the reinforcing rib 600, thereby aligning the sealed cavity 801 with the dust particle containing space 301, so that after the inner wall of the bend 300 between the two reinforcing ribs 600 is worn, the dust can just enter the sealed cavity 801.

[0040] In addition, such as Figure 9 As shown, the extension line of the centerline of the second rib 832 passes through the center of curvature of the bend 300. As the second rib 832 is arranged in a ring, its angle also changes. The second rib 832 serves to support and bear accumulated dust particles. Figure 11 As shown, due to the influence of airflow, the dust particle accumulation layer 802 accumulates higher on the side near the outer arc-shaped protective plate 810, resulting in a larger blocking area for dust particles and more effectively reducing the direct impact of particles on the outer arc-shaped protective plate 810. Since the second rib 832 is arranged along the airflow direction and the angle becomes closer and closer to horizontal, its effective area for bearing dust particles is larger. The most wear-prone part of the bend 300 is precisely the middle and rear section. Therefore, this arrangement allows the dust particles on the second rib 832 in the middle and rear section of the bend 300 to accumulate higher, resulting in a larger blocking area and more effectively reducing wear.

[0041] In a further embodiment of the present invention, a magnetic attraction structure can be provided on the outer arc-shaped protective plate 810, so that the outer arc-shaped protective plate 810 has a certain magnetic attraction ability, thereby adsorbing the metal dust in the airflow onto the inner surface of the outer arc-shaped protective plate 810, forming a dust particle protective layer, making it easier for dust particles to cover the inner surface of the outer arc-shaped protective plate 810, thereby isolating and buffering the dust particles that collide with the outer arc-shaped protective plate 810, avoiding direct impact on the inner side of the outer arc-shaped protective plate 810, and improving wear resistance and service life.

[0042] The optimal embodiment of this invention improves wear life without simply increasing wear-resistant thickness or optimizing the wear resistance of materials. This is achieved through various means, including: the deceleration caused by the increased diameter of the bend 300; the eccentric setting of the bend 300 to minimize airflow paths; the maximization of the eccentricity design; the structural reinforcement of the reinforcing ribs 600; the formation of the dust particle containing space 301 and the blocking and buffering of dust particles by the dust particle layer 302; the obstruction effect of the sealed cavity 801 on airflow and particles; the buffering effect of the dust particle accumulation layer 802 formed by the sealed cavity 801 on impacting dust particles; and the isolation and buffering effect of the dust particle protective layer 310 on particle impact. Compared to existing technologies that passively address wear, the pipe will still be worn through after a period of time, without changing the airflow state inside the pipe or fundamentally altering the wear rate of the pipe. The embodiments of the present invention greatly improve wear resistance and lifespan through a clever design that slows down the impact speed of particles, isolates particles from direct impact on the material (outer arc-shaped protective plate 810), and buffers subsequent impacting particles by adsorbing or accumulating dust particles. Rather than simply improving wear resistance through thickness or material properties, the invention has a clever structure and obvious effect.

[0043] In a specific embodiment of the present invention, the pipe erosion rate at bend 300 is... Satisfy the following formula: ; ; The erosion rate is the pipe erosion rate at the bend of 300 degrees. The particle flow rate at the 300° bend in the pipe. The velocity of the mixed fluid at the 300° bend in the pipe. The pipe diameter is for a 300mm bend. The density of the mixed fluid at the 300° bend in the pipe. It is a geometric constant. The particle size of the dust particles; The airflow rate is usually a constant value. As the formula shows, increasing the diameter of the 300mm bend leads to a decrease in velocity, thus reducing the pipe erosion and wear rate. Additionally, because... It is inversely proportional to the square of the pipe diameter, therefore It is not affected by changes in diameter. Specifically, when the pipe diameter increases and the flow velocity becomes 0.5 to 0.7 times the original, the erosion wear rate becomes 0.25 to 0.49 times the original, fundamentally reducing the wear of the dust-laden airflow on the bend wall.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wear-resistant bend, characterized in that, include: Imported straight pipe (100); A diffuser (200) is connected to the outlet end of the inlet straight pipe (100), and its diameter gradually increases along the airflow direction; The bend (300) has its inlet end connected to the diameter enlargement end of the diffuser (200); A tapered tube (400) is connected to the outlet end of the bend (300), and its diameter gradually decreases along the airflow direction; The outlet straight pipe (500) has its inlet end connected to the diameter-reducing end of the tapered pipe (400); A reinforcing rib (600) is connected to the inner wall of the outer side of the bend of the pipe (300); Wear-resistant reinforcement; The wear-resistant reinforcement is installed on the outer side of the bend of the pipe. The wear-resistant reinforcement includes an outer arc-shaped protective plate, an inner arc-shaped protective plate, and a skeleton. The inner arc-shaped protective plate is attached to and fixed to the outer side of the bend of the pipe. The outer arc-shaped protective plates are spaced apart on the outer side of the inner arc-shaped protective plate and surround each other to form a cavity. The skeleton is located between the outer arc-shaped protective plate and the inner arc-shaped protective plate. The cavity is divided into multiple closed cavities by the skeleton. The closed cavities are distributed in an array. The reinforcing ribs (600) are arranged at intervals along the extension direction of the bend (300), and a dust particle containing space (301) is defined between two adjacent reinforcing ribs (600) and the inner wall of the bend (300). The dust particle containing space (301) is used to collect dust particles to form a dust particle layer (302). The skeleton includes a first rib and a second rib. The second rib is aligned with the reinforcing ribs one by one, so that the sealed cavity is aligned with the dust particle containing space. This allows dust to enter the sealed cavity after the inner wall of the bend between the two reinforcing ribs is worn. The second rib extends along the circumferential contour of the bend, and the first rib extends along the bending direction of the bend. The first rib is arranged circumferentially along the bend, and the second rib is arranged along the bending direction of the bend. The first rib and the second rib are arranged in two different directions and intersect each other to form a grid, thus forming a matrix arrangement of sealed cavities. The extension line of the centerline of the second rib passes through the curvature center of the bend, and the angle of the second rib changes as it is arranged in a ring.

2. The wear-resistant bend according to claim 1, characterized in that, The inner wall profile of the outlet end of the inlet straight pipe (100) forms a first projection area (110) in a first plane, and the inner wall profile of the inlet end of the bend pipe (300) forms a second projection area (310) in a first plane. The center of the second projection area (310) is offset from the center of the first projection area (110) in a direction away from the curvature center of the bend pipe (300). The first plane is perpendicular to the airflow direction of the inlet straight pipe (100).

3. The wear-resistant bend according to claim 2, characterized in that, The inner wall profile of the air inlet end of the outlet straight pipe (500) forms a third projection area (510) in the second plane, and the inner wall profile of the air outlet end of the bend pipe (300) forms a fourth projection area (320) in the second plane. The center of the fourth projection area (320) is offset from the center of the third projection area (510) in a direction away from the curvature center of the bend pipe (300). The second plane is perpendicular to the airflow direction of the outlet straight pipe (500).

4. The wear-resistant bend according to claim 3, characterized in that, The outlet straight pipe (500) and the inlet straight pipe (100) have the same diameter, and the eccentricity of the center of the second projection area (310) relative to the center of the first projection area (110) is equal to the eccentricity of the center of the fourth projection area (320) relative to the center of the third projection area (510).

5. The wear-resistant bend according to claim 3 or 4, characterized in that, The third projection area (510) is within the fourth projection area (320), and the first projection area (110) is within the second projection area (310).

6. The wear-resistant bend according to claim 5, characterized in that, The boundary of the third projection region (510) is tangent to the boundary of the fourth projection region (320), and the boundary of the first projection region (110) is tangent to the boundary of the second projection region (310).

7. The wear-resistant bend according to claim 1, characterized in that, The pipe erosion rate at the bend (300) Satisfy the following formula: ； ； Let be the pipe erosion rate at the bend (300). The particle flow rate at the bend (300) is... Let be the velocity of the mixed fluid at the bend (300). The pipe diameter is for the bend (300). The density of the mixed fluid at the bend (300) is... It is a geometric constant. The particle size of the dust particles; This refers to the airflow rate.

8. The wear-resistant bend according to claim 1, characterized in that, The reinforcing rib (600) is a semi-circular arc-shaped strip.

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