A circular air pipe elbow wear-resistant bush structure

Abstract

The utility model relates to ventilation pipeline protection technical field, concretely is a kind of circular air pipe elbow wear-resistant bush structure, including circular air pipe elbow, internal bush mechanism and external connecting mechanism, the internal bush mechanism is fixedly connected in the inside of circular air pipe elbow.In the utility model, through the setting of buffer circular platform, helical flow guide plate and connecting clamp, the synergistic effect of airflow optimization and structure fixation is realized, helical flow guide plate adopts spiral angle design, can guide airflow to flow along elbow inner wall in helical smooth, effectively eliminate turbulent flow and airflow impact, can make the airflow impact intensity of elbow outside reduce, the buffer circular platform in middle portion can play the shunt buffering effect to core airflow, avoid local concentrated wear, the cooperation of connecting clamp and clamping groove is combined with the fixation of connecting bolt, so that internal wear-resistant bush and circular air pipe elbow form firm mechanical connection, improve connection strength, sealing element, sealing plug-in slot form double seal, significantly improve sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of ventilation duct protection technology, and in particular to a wear-resistant bushing structure for a circular duct elbow. Background Technology

[0002] Circular ducts are widely used in ventilation and air conditioning engineering, industrial dust removal, and other fields, playing a crucial role in the entire system as they are responsible for gas transport. Circular duct elbows, as key components in the duct system, bear the important responsibility of changing the direction of airflow. However, in actual operation, the strong impact and friction generated by airflow at the elbows cause them to wear easily. This not only reduces the service life of the duct system but may also lead to a series of problems such as gas leakage and increased system resistance, ultimately affecting the stable operation and efficiency of the entire system.

[0003] When the existing technical solution is used, the airflow will generate a strong impact effect and turbulence due to the sudden change in the curvature of the flow channel when it passes through the bend. The particulate impurities in the airflow will continuously scour the inner wall of the bend, which will further aggravate wear and easily lead to the gradual thinning of the duct wall thickness, shortening the service life of the pipeline system. It will also cause a chain of problems such as gas leakage, abnormal increase in system resistance, and increased energy consumption.

[0004] To address the above problems, this utility model provides a wear-resistant bushing structure for circular duct elbows. Summary of the Invention

[0005] The purpose of this utility model is to solve the problems of easy detachment of wear-resistant structure and poor air guiding effect of existing duct elbows, and to propose a wear-resistant bushing structure for circular duct elbows.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a wear-resistant bushing structure for a circular duct elbow, comprising a circular duct elbow, an internal bushing mechanism, and an external connecting mechanism. The internal bushing mechanism is fixedly connected to the interior of the circular duct elbow, and the external connecting mechanism is threadedly connected to the outer surface of the circular duct elbow. The internal bushing mechanism includes a sealing bushing assembly and an internal connecting shock-absorbing assembly.

[0007] The sealing bushing assembly includes a buffer frustum and a spiral guide plate. The internal connection shock absorption assembly includes shock absorption springs and connecting clamps. Multiple shock absorption springs are evenly spaced on the outer surface of the connecting clamps.

[0008] The sealing bushing assembly is threadedly connected to the inside of the circular duct elbow via a shock-absorbing component. The sealing bushing assembly includes an inner wear-resistant bushing that is snapped into the inside of the circular duct elbow. Multiple sealing elements are fixedly connected at equal intervals on the outer surface of the inner wear-resistant bushing. Snap-fit ​​grooves are provided on the inner walls at both ends of the inner wear-resistant bushing. The buffer frustum is fixedly connected to the middle of the inner wall of the inner wear-resistant bushing, and the spiral guide plate is fixedly connected to both ends of the inner wall of the inner wear-resistant bushing.

[0009] Furthermore, the internal connecting shock-absorbing component is threaded into the inside of the snap-fit ​​groove, the connecting clamp is symmetrically snapped into the inside of the snap-fit ​​groove, a rubber buffer pressing plate is fixedly connected to the top of the shock-absorbing buffer spring, the rubber buffer pressing plate and the shock-absorbing buffer spring are symmetrically arranged inside the snap-fit ​​groove, and a shock-absorbing pad is fixedly connected to the middle of the outer surface of the internal wear-resistant bushing.

[0010] Furthermore, the internal connection damping assembly also includes a connecting bolt threaded to the outer surface of the circular duct elbow, the threaded end of the connecting bolt being threadedly connected to the connecting clamp, and the fixed end of the connecting bolt being threadedly connected to the outer surface of the circular duct elbow.

[0011] Furthermore, a shock-absorbing pad is threaded into the gap between the connecting bolt and the circular duct elbow, and the internal wear-resistant bushing is threadedly connected to the inside of the circular duct elbow via a connecting clamp. The internal connecting shock-absorbing components are symmetrically arranged at both ends of the circular duct elbow.

[0012] Furthermore, the external connection mechanism includes a sealing insertion groove formed on the inner wall of the circular duct elbow. Multiple sealing insertion grooves are equally spaced on the inner wall of the circular duct elbow, and the internal wear-resistant bushing is inserted into the inner wall of the circular duct elbow through a sealing element.

[0013] Furthermore, the external connection mechanism also includes upper and lower fixing rings sleeved on the outer surface of the circular duct elbow. The upper and lower fixing rings are threaded with connectors on both sides, and the upper and lower fixing rings are threaded to the outer surface of the circular duct elbow through the connectors.

[0014] Furthermore, a clamping spring is fixedly connected to the inner wall of the upper and lower fixed rings, and a clamping plate is fixedly connected to the outer surface of the clamping spring. The clamping spring and the clamping plate are symmetrically arranged on the outer surface of the circular duct elbow.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, the synergistic effect of airflow optimization and structural fixation is achieved by setting up a buffer frustum, a spiral guide plate, and a connecting clamp. The spiral guide plate adopts a spiral angle design, which can guide the airflow to flow smoothly in a spiral shape along the inner wall of the elbow, effectively eliminating turbulence and airflow impact, and reducing the impact intensity of the airflow on the outside of the elbow. The buffer frustum in the middle can play a diversion and buffering role for the core airflow, further dispersing the airflow energy and avoiding local concentrated wear. The cooperation between the connecting clamp and the snap-fit ​​groove, combined with the fixing of the connecting bolts, forms a firm mechanical connection between the internal wear-resistant bushing and the circular duct elbow, improving the connection strength. The sealing element and the sealing plug groove form a double seal, which significantly improves the sealing performance.

[0016] 2. In this utility model, a multi-level shock absorption and fixing system is constructed by setting up shock-absorbing buffer springs, clamping springs and clamping plates. The internal shock-absorbing buffer springs cooperate with the rubber buffer pressing plate to absorb the energy generated by airflow impact and system vibration, reducing the vibration wear of the internal wear-resistant bushings. The external clamping springs and clamping plates form a flexible clamping structure, which can achieve reliable fixing through spring force and adapt to slight deformation of the air duct, avoiding structural damage caused by hard contact. The setting of anti-vibration pads effectively prevents the connecting bolts from loosening under vibration conditions, ensuring the long-term stability of the overall structure. Attached Figure Description

[0017] Figure 1 This utility model provides a three-dimensional structural diagram of a wear-resistant bushing structure for a circular duct elbow; Figure 2 This utility model provides a structural diagram of the connecting clamp in the wear-resistant bushing structure of a circular duct elbow; Figure 3 This utility model proposes a wear-resistant bushing structure for a circular duct elbow. Figure 2 Enlarged view of point A; Figure 4 This utility model provides a schematic diagram of the structure of the clamping spring in the wear-resistant bushing structure of a circular duct elbow; Figure 5 This utility model provides a schematic diagram of the spiral guide plate in the wear-resistant bushing structure of a circular duct elbow; Figure 6 This utility model proposes a wear-resistant bushing structure for a circular duct elbow. Figure 5 Enlarged view of point B; Figure 7 This utility model proposes a wear-resistant bushing structure for a circular duct elbow. Figure 5 Enlarged diagram of point C.

[0018] Legend: 1. Circular duct elbow; 2. Internal bushing mechanism; 21. Sealing bushing assembly; 211. Buffer frustum; 212. Spiral guide plate; 213. Internal wear-resistant bushing; 214. Seal; 215. Snap-fit ​​groove; 216. Shock-absorbing pad; 22. Internal connection shock-absorbing assembly; 221. Shock-absorbing buffer spring; 222. Connecting clamp; 223. Rubber buffer pressing plate; 224. Connecting bolt; 225. Anti-vibration pad; 3. External connection mechanism; 31. Sealing insertion groove; 32. Upper and lower fixing rings; 33. Connector; 34. Clamping spring; 35. Clamping plate. Detailed Implementation

[0019] Please see Figure 1-7 This utility model provides a technical solution: a wear-resistant bushing structure for a circular duct elbow 1, including a circular duct elbow 1, an internal bushing mechanism 2 and an external connecting mechanism 3. The internal bushing mechanism 2 is fixedly connected to the inside of the circular duct elbow 1, and the external connecting mechanism 3 is threadedly connected to the outer surface of the circular duct elbow 1. The internal bushing mechanism 2 includes a sealing bushing assembly 21 and an internal connecting shock-absorbing assembly 22.

[0020] The specific configuration and function of its internal bushing mechanism 2 and external connecting mechanism 3 will be explained below.

[0021] In this embodiment: the sealing bushing assembly 21 includes a buffer frustum 211 and a spiral guide plate 212, and the internal connection damping assembly 22 includes a damping spring 221 and a connecting clamp 222. Multiple damping springs 221 are evenly spaced on the outer surface of the connecting clamp 222.

[0022] The sealing bushing assembly 21 is threadedly connected to the inside of the circular duct elbow 1 via a connecting shock-absorbing assembly. The sealing bushing assembly 21 includes an inner wear-resistant bushing 213 that is snapped into the inside of the circular duct elbow 1. Multiple snapped sealing elements 214 are fixedly connected at equal intervals on the outer surface of the inner wear-resistant bushing 213. Snap-fit ​​grooves 215 are opened on the inner walls at both ends of the inner wear-resistant bushing 213. A buffer frustum 211 is fixedly connected to the middle of the inner wall of the inner wear-resistant bushing 213. A spiral guide plate 212 is fixedly connected to both ends of the inner wall of the inner wear-resistant bushing 213.

[0023] The effects achieved by the above components are as follows: the spiral guide plate 212 can guide the airflow to flow smoothly along the inner wall of the inner wear-resistant bushing 213 in a spiral line, breaking the turbulent state of the airflow at the traditional elbow, and transforming the impact wear of the airflow on the inner wall of the bushing into surface contact friction. The buffer frustum 211, through the streamlined structure with a central protrusion, diverts and buffers the core airflow, preventing high-speed airflow from directly impacting the outside of the elbow, and further balancing the airflow distribution. The connecting clamp 222 provides a stable mounting carrier for the shock-absorbing buffer spring 221. The equally spaced springs can form a uniform radial buffer force, initially absorbing the vibration energy generated by the airflow impact, and reducing the hard contact wear between the bushing and the duct elbow.

[0024] Specifically, the internal shock-absorbing component 22 is threaded into the inside of the snap-fit ​​groove 215, the connecting clamp 222 is symmetrically snapped into the inside of the snap-fit ​​groove 215, the top of the shock-absorbing buffer spring 221 is fixedly connected to a rubber buffer pressing plate 223, the rubber buffer pressing plate 223 and the shock-absorbing buffer spring 221 are symmetrically arranged inside the snap-fit ​​groove 215, and the middle of the outer surface of the internal wear-resistant bushing 213 is fixedly connected to a shock-absorbing pad 216.

[0025] The effects achieved by the above components are as follows: forming a multi-level shock absorption and buffer system, improving the structure's vibration resistance; the symmetrical snap-fit ​​connecting clamps 222 can quickly and accurately connect with the snap-fit ​​grooves 215, and the detachable structure facilitates installation and maintenance; at the same time, the threaded connection strengthens the fixing relationship with the bushing, preventing the bushing from moving axially; the rubber buffer pressing plate 223 transforms the point contact force of the shock absorption spring 221 into surface contact, avoiding local pressure marks and wear on the inner wall of the snap-fit ​​groove 215 caused by the spring; at the same time, the rubber material can absorb high-frequency vibration, forming a composite effect of rigid buffering and flexible shock absorption with the spring; the symmetrically arranged buffer structure ensures that the bushing is subjected to balanced force, avoiding uneven wear of the bushing caused by unilateral vibration; the shock-absorbing pad 216 in the middle fills the gap between the bushing and the middle of the duct elbow, absorbing radial vibration and further enhancing the sealing effect.

[0026] Specifically, the internal connection shock absorption assembly 22 also includes a connecting bolt 224 threaded to the outer surface of the circular duct elbow 1. The threaded end of the connecting bolt 224 is threaded to the connecting clamp 222, and the fixed end of the connecting bolt 224 is threaded to the outer surface of the circular duct elbow 1.

[0027] The effects achieved by the above components are as follows: to realize internal and external linkage fixation, enhance structural stability, the connecting bolt 224 penetrates the wall of the circular duct elbow 1 and is directly connected to the internal connecting clamp 222, thus constructing a rigid fixing link from the outer wall of the duct to the inner wall of the bushing, improving axial fixing strength, and the external fixing design of the bolt facilitates disassembly operation during later maintenance, and maintenance can be completed without damaging the bushing body, thus reducing maintenance costs.

[0028] Specifically, a shock-absorbing pad 225 is threaded into the gap between the connecting bolt 224 and the circular duct elbow 1. The internal wear-resistant bushing 213 is threaded into the inside of the circular duct elbow 1 through the connecting clamp 222. The internal shock-absorbing components 22 are symmetrically arranged at both ends of the circular duct elbow 1.

[0029] The effects achieved by the above components are as follows: improving the vibration resistance and anti-loosening performance of the fixed structure, ensuring long-term reliability; the anti-vibration pad 225 is made of elastic rubber, which compresses and deforms after the connecting bolt 224 is tightened, filling the gap between the bolt and the duct wall; at the same time, its elastic recovery force can continuously apply pre-tightening force to the bolt, effectively preventing bolt loosening caused by high-frequency vibration; the internal connecting damping components 22, which are symmetrically arranged at both ends, make the force on both ends of the bushing balanced, avoid bushing tilting caused by unilateral fixing, ensure the coaxiality of the bushing and the duct elbow, and reduce local wear caused by eccentricity; through the intermediate connection of the connecting clamp 222, the fixing force of the connecting bolt 224 is evenly transmitted to both ends of the bushing, avoiding local stress concentration caused by the bolt acting directly on the bushing.

[0030] Specifically, the external connection mechanism 3 includes a sealing insertion groove 31 formed on the inner wall of the circular duct elbow 1. Multiple sealing insertion grooves 31 are equally spaced on the inner wall of the circular duct elbow 1. The internal wear-resistant bushing 213 is inserted into the inner wall of the circular duct elbow 1 through a sealing element 214.

[0031] The effects achieved by the above components are as follows: a multi-seal, precise positioning sealing system is constructed. The sealing insertion groove 31 and the sealing element 214 form a mating structure, which upgrades the sealing element 214 from a simple gap filling to an embedded seal, effectively preventing airflow leakage along the bushing axis. Multiple equally spaced sealing insertion grooves 31 form multiple sealing defenses. Even if one sealing element 214 is damaged, the remaining sealing structures can still maintain a basic sealing effect, improving the redundancy of the sealing system. The insertion mating method provides a precise radial positioning reference for bushing installation, avoiding airflow deviation and wear caused by eccentricity.

[0032] Specifically, the external connection mechanism 3 also includes upper and lower fixing rings 32 that are sleeved on the outer surface of the circular duct elbow 1. The upper and lower fixing rings 32 are threaded with connectors 33 on both sides, and the upper and lower fixing rings 32 are threaded to the outer surface of the circular duct elbow 1 through the connectors 33.

[0033] The effects achieved by the above components are as follows: external overall reinforcement and improved structural integrity. The upper and lower fixing rings 32 adopt a semi-circular split structure, which can be quickly fitted onto the outer surface of the duct elbow without disassembling the duct, making it suitable for on-site maintenance scenarios. The connecting parts 33 on both sides are fastened with bolts to form a complete ring constraint between the upper and lower rings, applying a uniform radial clamping force to the outer wall of the duct elbow, enhancing the structural rigidity of the duct elbow itself, and reducing the amount of deformation of the duct caused by airflow impact. The external fixing structure and the internal connecting shock absorption component 22 complement each other, making the bushing and the duct elbow form an integral force-bearing structure, improving the overall impact resistance.

[0034] Specifically, a clamping spring 34 is fixedly connected to the inner wall of the upper and lower fixed rings 32, and a clamping plate 35 is fixedly connected to the outer surface of the clamping spring 34. The clamping spring 34 and the clamping plate 35 are symmetrically arranged on the outer surface of the circular duct elbow 1.

[0035] The effects achieved by the above components are as follows: flexible clamping and fixing are achieved, taking into account both fixing reliability and structural adaptability. The elastic characteristics of the clamping spring 34 allow the clamping plate 35 to adapt to the small dimensional deviations of the outer wall of the duct, ensuring uniform transmission of clamping force and avoiding damage to the outer wall of the duct caused by hard contact. The symmetrically arranged clamping structure provides uniform radial constraint to the duct, further enhancing the coaxiality of the duct and the bushing. The clamping spring 34 can absorb some of the external vibration energy, forming a double damping effect with the internal damping structure. The clamping plate 35 increases the contact area with the outer wall of the duct, avoiding point contact damage to the duct caused by the spring. At the same time, its arc-shaped structure fits perfectly with the outer wall of the duct, improving clamping stability.

[0036] Working principle: When a high-speed airflow containing particles enters the circular duct elbow 1, it first contacts the spiral guide plates 212 at both ends of the inner wear-resistant bushing 213. The spiral angle of the guide plates guides the airflow to flow along the inner wall of the bushing in a spiral trajectory, transforming the impact wear at the traditional elbow into surface contact friction. At the same time, it breaks the turbulent state, making the airflow velocity distribution more uniform. When flowing through the middle, the buffer frustum 211 diverts the core high-speed airflow, splitting the single airflow into multiple low-speed airflows, reducing the impact intensity of the airflow on the high-wear area on the outside of the elbow, and reducing the causes of wear from the source.

[0037] The optimized airflow acts on the inner wall of the internal wear-resistant bushing 213. The high-hardness wear-resistant material of the bushing directly bears the impact of particles. Its smooth surface can reduce the probability of particle adhesion and reduce abrasive wear. At the same time, the shock-absorbing pad 216 and the seal 214 between the bushing and the duct elbow form an isolation layer to prevent corrosion on the back of the bushing caused by the infiltration of corrosive media and extend the service life of the bushing.

[0038] The vibrations generated by airflow impact and system operation are first absorbed by the internal rubber buffer pressing plate 223. The flexibility of the rubber material can attenuate high-frequency vibrations. The remaining vibration energy is transferred to the shock-absorbing buffer spring 221. The spring converts the vibration energy into elastic potential energy through expansion and contraction, achieving rigid buffering. The external clamping spring 34 plays a role simultaneously, absorbing the externally transmitted vibrations through elastic expansion and contraction, forming double shock absorption inside and outside, avoiding reciprocating wear caused by vibration.

[0039] The bushing is initially positioned by the engagement of the connecting clamp 222 and the clamping groove 215. The connecting bolt 224 penetrates the duct wall and is threaded to the clamp, forming a rigid internal and external fixing link to prevent the bushing from moving axially. After the upper and lower fixing rings 32 are locked by the connecting piece 33, the clamping plate 35 is tightly attached to the outer wall of the duct under the action of the clamping spring 34, forming a flexible clamp and further strengthening the fixing effect. The sealing piece 214 on the outer surface of the internal wear-resistant bushing 213 is embedded in the sealing insertion groove 31 of the circular duct elbow 1 to form multiple embedded seals to prevent airflow and corrosive media leakage. At the same time, the anti-vibration pad 225 and the shock-absorbing pad 216 fill the connection gaps, taking into account both sealing and shock absorption functions.

[0040] The components work in a closed loop, optimizing airflow to reduce wear sources, wear-resistant bushings to enhance protection, shock-absorbing structures to reduce vibration wear, and fixed seals to ensure structural stability. When system pressure fluctuations lead to increased airflow impact, the extension and contraction of the shock-absorbing buffer spring 221 increases synchronously to offset the impact by increasing the buffering force. At the same time, the preload of the connecting bolt 224 ensures that the bushing will not shift due to the impact, and the compression of the seal 214 increases synchronously to improve sealing performance and achieve adaptive adjustment under pressure fluctuations.

Claims

1. A wear-resistant bushing structure for a circular duct elbow, comprising a circular duct elbow (1), an internal bushing mechanism (2), and an external connecting mechanism (3), characterized in that: The internal bushing mechanism (2) is fixedly connected to the inside of the circular duct elbow (1), and the external connection mechanism (3) is threadedly connected to the outer surface of the circular duct elbow (1). The internal bushing mechanism (2) includes a sealing bushing assembly (21) and an internal connection shock absorption assembly (22). The sealing bushing assembly (21) includes a buffer frustum (211) and a spiral guide plate (212), and the internal connection shock absorption assembly (22) includes a shock absorption spring (221) and a connecting clamp (222). Multiple shock absorption springs (221) are equally spaced on the outer surface of the connecting clamp (222). The sealing bushing assembly (21) is threadedly connected to the inside of the circular duct elbow (1) via the connecting shock-absorbing assembly (22). The sealing bushing assembly (21) includes an inner wear-resistant bushing (213) that is snapped into the inside of the circular duct elbow (1). Multiple snapped sealing elements (214) are fixedly connected at equal intervals on the outer surface of the inner wear-resistant bushing (213). Snap-fit ​​grooves (215) are opened on the inner walls at both ends of the inner wear-resistant bushing (213). The buffer frustum (211) is fixedly connected to the middle of the inner wall of the inner wear-resistant bushing (213). The spiral guide plate (212) is fixedly connected to both ends of the inner wall of the inner wear-resistant bushing (213).

2. The wear-resistant bushing structure for a circular duct elbow according to claim 1, characterized in that: The internal connection shock absorption component (22) is threaded into the inside of the snap-fit ​​groove (215), the connection clamp (222) is symmetrically snapped into the inside of the snap-fit ​​groove (215), the top of the shock absorption buffer spring (221) is fixedly connected to a rubber buffer pressing plate (223), the rubber buffer pressing plate (223) and the shock absorption buffer spring (221) are symmetrically arranged inside the snap-fit ​​groove (215), and the middle of the outer surface of the internal wear-resistant bushing (213) is fixedly connected to a shock-absorbing pad (216).

3. The wear-resistant bushing structure for a circular duct elbow according to claim 1, characterized in that: The internal connection shock absorption assembly (22) also includes a connecting bolt (224) threaded to the outer surface of the circular duct elbow (1). The threaded end of the connecting bolt (224) is threaded to the connecting clamp (222), and the fixed end of the connecting bolt (224) is threaded to the outer surface of the circular duct elbow (1).

4. The wear-resistant bushing structure for a circular duct elbow according to claim 3, characterized in that: A shock-absorbing pad (225) is threaded into the gap between the connecting bolt (224) and the circular duct elbow (1). The internal wear-resistant bushing (213) is threaded into the interior of the circular duct elbow (1) through a connecting clamp (222). The internal connecting shock-absorbing assembly (22) is symmetrically arranged at both ends of the circular duct elbow (1).

5. The wear-resistant bushing structure for a circular duct elbow according to claim 1, characterized in that: The external connection mechanism (3) includes a sealing insertion groove (31) opened on the inner wall of the circular duct elbow (1). Multiple sealing insertion grooves (31) are equally spaced on the inner wall of the circular duct elbow (1). The internal wear-resistant bushing (213) is inserted into the inner wall of the circular duct elbow (1) through a sealing element (214).

6. The wear-resistant bushing structure for a circular duct elbow according to claim 5, characterized in that: The external connection mechanism (3) also includes upper and lower fixed rings (32) sleeved on the outer surface of the circular duct elbow (1). The upper and lower fixed rings (32) are threaded with connectors (33) on both sides. The upper and lower fixed rings (32) are threaded to the outer surface of the circular duct elbow (1) through the connectors (33).

7. The wear-resistant bushing structure for a circular duct elbow according to claim 6, characterized in that: The inner wall of the upper and lower fixed rings (32) is fixedly connected with a clamping spring (34), and the outer surface of the clamping spring (34) is fixedly connected with a clamping plate (35). The clamping spring (34) and the clamping plate (35) are symmetrically arranged on the outer surface of the circular duct elbow (1).

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