Air preheater sealing structure

Abstract

The utility model relates to air preheater sealing technical field discloses a kind of air preheater sealing structure, including fan-shaped plate, sealing sheet and the quick-release mechanism for realizing the quick connection of both. Quick-release mechanism includes the outer rod of being passed in fan-shaped plate and sealing sheet, the inner rod of being axially slidably arranged in the inner portion of outer rod, spring, limiting rod, square slot, pull ring and the reinforcing assembly being connected in outer rod by thread. Pressing inner rod, limiting rod is ejected from square slot to engage fan-shaped plate under the action of spring, and then fixed by reinforcing assembly tight sealing sheet is realized;Limiting rod can be retracted by pulling pull ring. Structure further include the cleaning mechanism being set in the inner wall of shell, and cleaning mechanism includes water pipe, connecting rod, rotating block and spray head, and water flow can drive rotating block rotation, and fan-shaped plate is automatically cleaned. The utility model solves the problem that sealing sheet replacement is cumbersome and fan-shaped plate is easy to accumulate dust, with the beneficial effects of convenient replacement, efficient maintenance, online cleaning, guaranteeing heat exchange efficiency.

Description

Technical Field

[0001] This utility model relates to the field of air preheater sealing technology, and in particular to an air preheater sealing structure. Background Technology

[0002] Air preheaters are important auxiliary equipment in boiler systems, mainly used to recover waste heat from flue gas to preheat combustion air, thereby improving the boiler's thermal efficiency and fuel combustion efficiency. To prevent leakage and cross-contamination between flue gas and air and ensure heat exchange efficiency, air preheaters are equipped with reliable sealing structures.

[0003] As a key and vulnerable component in the sealing structure of an air preheater, the sealing strip operates for extended periods in a high-temperature, dusty, and corrosive flue gas environment. Under continuous harsh operating conditions, the sealing strip is prone to wear, aging, and even bending deformation, leading to a decline in sealing performance and necessitating regular inspection and replacement.

[0004] In existing technologies, sealing plates are typically installed and fixed using bolts or screws. When a failed sealing plate needs to be replaced, maintenance personnel must disassemble numerous fastening screws one by one. Because the equipment operates in a high-temperature environment for extended periods, the screws are prone to rusting and stripping, making disassembly extremely difficult. This not only consumes significant manpower and time but also significantly extends the equipment's downtime maintenance cycle, directly impacting production efficiency and increasing operating costs. Therefore, this invention proposes an air preheater sealing structure to address the shortcomings of existing technologies. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an air preheater sealing structure, which aims to improve the problem that in the prior art, most air preheater sealing plates are fixed with screws, resulting in a cumbersome and time-consuming replacement process and low maintenance efficiency.

[0006] This utility model provides an air preheater sealing structure, including a sector plate and a sealing sheet connected to the sector plate; the air preheater sealing structure also includes a quick-release mechanism.

[0007] The quick-release mechanism includes an outer rod, an inner rod, a spring, a limiting rod, a square slot, a thread, a pull ring, and a reinforcing assembly. The outer rod is axially slidable inside the outer rod; the limiting rod is connected to one end of the inner rod; the spring is located between the inner rod and the outer rod and provides elastic force to extend the limiting rod out of the square slot on the outer rod to engage with the outer side of the sector plate; the thread is located on the outer periphery of the outer rod; the pull ring is connected to the other end of the outer rod and is used to retract the limiting rod into the inner part of the outer rod through cooperation with the square slot to release the engagement.

[0008] Furthermore, the outer rod passes through the sector plate and the sealing plate; the reinforcing component is threadedly connected to the thread. The quick-release mechanism, through the precise cooperation between the outer rod, inner rod, spring, limiting rod, and reinforcing component, enables rapid installation and removal of the sealing plate, greatly improving maintenance efficiency. Specifically, under the action of the spring, the limiting rod on the inner rod can freely extend into or retract into the square groove of the outer rod, thereby achieving engagement and unlocking of the sector plate. The thread and reinforcing component provide additional fixation and pressure adjustment, ensuring the sealing plate's stability and reliability in operation.

[0009] Preferably, the reinforcing component includes a fixing block and an operating rod; the fixing block is threadedly connected to the outer rod, and the operating rod is connected to the fixing block for driving the fixing block to move axially along the outer rod to tighten or loosen the sealing sheet. This design makes the fixing of the sealing sheet more flexible and adjustable, facilitating precise adjustment of the clamping force according to actual needs, and further ensuring the sealing effect.

[0010] Preferably, the air preheater sealing structure further includes a housing and a cleaning mechanism disposed along the inner wall of the housing. The cleaning mechanism includes a fixing plate, a fixing ring, a water pipe, a connecting block, a connecting rod, a rotating block, and a nozzle; the fixing plate and fixing ring are used to fix the water pipe to the inner wall of the housing; the water pipe is connected to the connecting rod via the connecting block, and the other end of the connecting rod is rotatably connected to the rotating block, with the nozzle disposed on the rotating block. The introduction of this cleaning mechanism adds an automated solution to the daily maintenance of the equipment, effectively solving the problem of dust accumulation on the fan-shaped plate.

[0011] Preferably, the rotating block has an internal flow channel connected to a water pipe, and the nozzle is connected to the flow channel; the nozzle spray direction has a tangential component, so that the water flow from the nozzle can drive the rotating block to rotate around the rotation axis of the connecting rod to clean the fan-shaped plate. This design uses the energy of the water flow itself to drive the nozzle rotation, realizing an efficient and automated cleaning process, requiring no additional power source, and is simple and reliable in structure.

[0012] Preferably, the limiting rod is a pin inserted through the end of the inner rod. Using a pin structure as the limiting rod has advantages such as simple structure, convenient manufacturing, and uniform force distribution, further improving the reliability and durability of the quick-release mechanism.

[0013] Preferably, the groove wall of the square groove facing the pull ring has a beveled structure. When the pull ring is pulled, the beveled structure can compress the limiting rod, forcing the limiting rod to retract into the outer rod. This ingenious bevel design ensures that the limiting rod can retract smoothly and easily when the engagement is released, avoiding jamming and improving the ease of operation.

[0014] Preferably, an elastic washer is fixedly connected to the end face of the fixing block facing the sealing sheet to provide cushioning and increase friction when the sealing sheet is pressed. The elastic washer can compensate for any minor unevenness that may exist on the surface of the sealing sheet, increase the sealing performance of the contact surface, effectively absorb vibration, and extend the service life of the sealing sheet and the quick-release mechanism.

[0015] Preferably, the spring is a compression spring, with its two ends abutting against the inner wall step of the outer rod and the flange of the inner rod, respectively. This precise spring installation method ensures that the spring provides a stable and reliable restoring force between the inner and outer rods, ensuring smooth and powerful pop-out and retraction of the limiting rod.

[0016] This utility model has the following beneficial effects:

[0017] 1. This utility model solves the problem that the existing technology of fixing sealing plates with screws, which leads to cumbersome replacement process, time-consuming and labor-intensive process and low maintenance efficiency, by setting a quick-release mechanism composed of an outer rod, an inner rod, a spring, a limiting rod and a reinforcing component. It simplifies the installation and removal of sealing plates to the action of "one press and one screw" and "one pull", which significantly shortens the maintenance time, reduces labor intensity and makes the replacement process more convenient and efficient.

[0018] 2. This utility model, by setting up a cleaning mechanism consisting of water pipes, connecting rods, rotating blocks and nozzles, uses water flow to drive the nozzles to rotate and spray the fan-shaped plates. This solves the problems in the prior art where the fan-shaped plates are prone to dust accumulation and blockage, resulting in a decrease in heat exchange efficiency, and where manual cleaning is difficult, requires downtime, and has high maintenance costs. It achieves the technical effect of automated online cleaning of the fan-shaped plates, effectively preventing dust accumulation, and maintaining the efficient and stable operation of the equipment, significantly reducing the frequency and cost of downtime maintenance. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of an air preheater sealing structure proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the sealing sheet of an air preheater sealing structure proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the pull ring structure of the air preheater sealing structure proposed in this utility model;

[0022] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0023] Legend:

[0024] 1. Sector plate;

[0025] 2. Quick-release mechanism; 21. Outer rod; 22. Inner rod; 23. Spring; 24. Limiting rod; 25. Square groove; 26. Thread; 27. Pull ring;

[0026] 28. Reinforcing component; 281. Fixing block; 282. Operating lever;

[0027] 3. Cleaning mechanism; 31. Fixing plate; 32. Fixing ring; 33. Water pipe; 34. Connecting block; 35. Connecting rod; 36. Rotating block; 37. Spray head;

[0028] 4. Sealing plate; 5. Outer shell. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example:

[0031] Reference Figures 1 to 4 This utility model embodiment provides an air preheater sealing structure, which aims to solve the problem of cumbersome replacement and low maintenance efficiency of the air preheater sealing sheet 4 due to screw fixing in the prior art.

[0032] Reference Figure 1 It includes a sector plate 1 and a sealing sheet 4 connected to the sector plate 1. A quick-release mechanism 2 enables rapid fixing and disassembly between the sector plate 1 and the sealing sheet 4. (Refer to...) Figure 2 , Figure 3 and Figure 4The quick-release mechanism 2 includes an outer rod 21, an inner rod 22, a spring 23, a limiting rod 24, a square groove 25, a thread 26, a pull ring 27, and a reinforcing assembly 28. The outer rod 21 is used to pass through the connecting through hole of the sector plate 1 and the sealing plate 4, while the inner rod 22 is axially slidably disposed inside the outer rod 21. The limiting rod 24 is a pin that passes through the end of the inner rod 22, and both ends of the limiting rod 24 can pass through the square groove 25 opened on the outer rod 21. The spring 23 is a compression spring, which is disposed between the inner rod 22 and the outer rod 21, and both ends of the spring 23 abut against the inner wall step of the outer rod 21 and the flange of the inner rod 22, respectively, to provide elastic force for the limiting rod 24 to extend out of the square groove 25 and engage with the outside of the sector plate 1. The pull ring 27 is connected to the other end of the outer rod 21. Used to apply pulling force during disassembly; the groove wall of the square groove 25 facing the pull ring 27 is a beveled structure. When the pull ring 27 is pulled, the beveled structure can squeeze the limiting rod 24, forcing the limiting rod 24 to retract into the outer rod 21 to release the engagement; the reinforcing component 28 is used to reinforce the locked state of the quick-release mechanism 2. The thread 26 is provided on the outer periphery of the outer rod 21, and the reinforcing component 28 is threadedly connected to the outer rod 21 through the thread 26; the reinforcing component 28 includes a fixing block 281 and an operating rod 282. The operating rod 282 is connected to the fixing block 281 and is used to drive the fixing block 281 to move axially along the outer rod 21 to press the sealing plate 4; an elastic washer is fixedly connected to one end face of the fixing block 281 facing the sealing plate 4 to provide cushioning and increase friction when pressing the sealing plate 4.

[0033] Reference Figure 1 The cleaning mechanism 3 includes a fixing plate 31, a fixing ring 32, a water pipe 33, a connecting block 34, a connecting rod 35, a rotating block 36, and a nozzle 37. The fixing plate 31 and the fixing ring 32 are used to fix the water pipe 33 to the inner wall of the outer casing 5 to ensure the stability of the water pipe 33 during cleaning operations. The water pipe 33 serves as the main pipeline for conveying the cleaning medium and is connected to the connecting rod 35 through the connecting block 34. The other end of the connecting rod 35 is rotatably connected to the rotating block 36, which allows the rotating block 36 to rotate freely under the action of water flow. The nozzle 37 is set on the rotating block 36 and is used to atomize or disperse the water flow.

[0034] The rotating block 36 has a flow channel inside that communicates with the water pipe 33, and the nozzle 37 is connected to the flow channel to ensure that the water flow can reach the nozzle 37 smoothly. The spray direction of the nozzle 37 has a tangential component, which makes the water flow sprayed from the nozzle 37 generate a reaction torque, thereby driving the rotating block 36 to rotate at high speed around the rotation axis of the connecting rod 35, forming a rotating spray effect. This rotating spray structure ensures that the clean water flow can cover the surface of the fan-shaped plate 1 in a dynamic scanning manner, thereby efficiently peeling off and washing away the accumulated dust and ensuring heat exchange efficiency.

[0035] Reference Figure 2 and Figure 4 The specific structure of the limiting rod 24 is a pin that passes through the end of the inner rod 22. In the assembled state, both ends of the limiting rod 24 can extend out of the square grooves 25 on both sides of the outer rod 21 at the same time to form a symmetrical locking structure, so as to evenly apply the force to the sector plate 1 and ensure the stability and reliability of the connection.

[0036] Reference Figure 4 The groove wall of the square groove 25 facing the pull ring 27 is processed into a bevel structure. When the pull ring 27 is pulled to move the outer rod 21 axially, the bevel structure contacts the limiting rod 24 and generates a radial force. This force is used to overcome the elastic force of the spring 23 and smoothly press the limiting rod 24 back into the interior of the outer rod 21, thus achieving quick unlocking.

[0037] Reference Figure 2 In the reinforcement component 28, an elastic washer is fixedly connected to one end face of the fixing block 281 facing the sealing sheet 4. The elastic washer is preferably made of high temperature resistant rubber. When the fixing block 281 is tightened by the operating rod 282, the elastic washer can provide pre-tightening force and compensate for the slight unevenness of the surface of the sealing sheet 4, thereby enhancing the sealing effect and the vibration resistance of the connection.

[0038] Reference Figure 4 The specific installation method of spring 23 is as follows: spring 23 is a compression spring, and its two ends abut against the inner wall step of outer rod 21 and the flange of inner rod 22 respectively. This structure provides accurate axial positioning and stable reset force for the relative movement of inner rod 22 and outer rod 21, ensuring the reliability of the release action of limit rod 24.

[0039] The implementation principle of this application embodiment is as follows: When replacing and installing the sealing sheet 4, the outer rod 21 of the quick-release mechanism 2 passes through the through hole on the sector plate 1 and the sealing sheet 4, and the inner rod 22 is pressed down. The inner rod 22 is displaced under the elastic force of the spring 23, so that the limiting rod 24 at the other end pops out from the square groove 25 of the outer rod 21 and is locked outside the sector plate 1, completing the initial locking. Then, the operating rod 282 of the reinforcing component 28 is rotated, so that the fixing block 281 moves along the thread 26 on the outside of the outer rod 21 until the sealing sheet 4 is pressed tightly, and a firm fixation is achieved. When disassembly is required, the pull ring 27 is pulled outward, and the outer rod 21 moves accordingly. The inclined structure of the square groove 25 on the outer rod 21 will squeeze the limiting rod 24, forcing the limiting rod 24 to overcome the elastic force of the spring 23 and retract into the outer rod 21. At this time, the locking state is released, and the entire quick-release mechanism 2 and the old sealing sheet 4 can be taken out together.

[0040] During cleaning operations, the cleaning water flows through the water pipe 33 fixed to the inner wall of the outer casing 5, through the connecting block 34 and the connecting rod 35, and enters the flow channel inside the rotating block 36. The water finally sprays out at high speed from the nozzles 37 set on the rotating block 36. Since the spray direction of the nozzles 37 has a tangential component, the reaction force of the sprayed water will drive the rotating block 36 to rotate at high speed around the rotation axis of the connecting rod 35. Multiple nozzles 37 perform large-scale dynamic scanning spray rinsing on the surface of the fan-shaped plate 1 as the rotating block 36 rotates, thereby effectively removing accumulated dust.

Claims

1. An air preheater sealing structure, comprising a sector plate (1) and a sealing sheet (4) connected to the sector plate (1); characterized in that, The air preheater sealing structure also includes a quick-release mechanism (2); The quick-release mechanism (2) includes an outer rod (21), an inner rod (22) axially slidably disposed inside the outer rod (21), a spring (23), a limiting rod (24), a square groove (25), a thread (26), a pull ring (27), and a reinforcing component (28). The outer rod (21) passes through the sector plate (1) and the sealing sheet (4). The limiting rod (24) is connected to one end of the inner rod (22), the spring (23) is disposed between the inner rod (22) and the outer rod (21), and is used to provide elastic force to make the limiting rod (24) extend out of the square groove (25) opened on the outer rod (21) to engage with the outside of the sector plate (1), the thread (26) is disposed on the outer periphery of the outer rod (21), the reinforcing component (28) is threaded to the thread (26), and the pull ring (27) is connected to the other end of the outer rod (21) to retract the limiting rod (24) into the interior of the outer rod (21) by cooperating with the square groove (25) to release the engagement.

2. The air preheater sealing structure according to claim 1, characterized in that, The reinforcement component (28) includes a fixing block (281) and an operating lever (282); The fixing block (281) is threadedly connected to the outer rod (21) via the thread (26), and the operating rod (282) is connected to the fixing block (281) for driving the fixing block (281) to move axially along the outer rod (21) to press or release the sealing sheet (4).

3. The air preheater sealing structure according to claim 1, characterized in that, The air preheater sealing structure also includes a housing (5) and a cleaning mechanism (3) disposed along the inner wall of the housing (5); The cleaning mechanism (3) includes a fixed plate (31), a fixed ring (32), a water pipe (33), a connecting block (34), a connecting rod (35), a rotating block (36), and a nozzle (37). The fixing plate (31) and the fixing ring (32) are used to fix the water pipe (33) to the inner wall of the outer shell (5); The water pipe (33) is connected to the connecting rod (35) via the connecting block (34), and the other end of the connecting rod (35) is rotatably connected to the rotating block (36), and the nozzle (37) is disposed on the rotating block (36).

4. The air preheater sealing structure according to claim 3, characterized in that, The rotating block (36) has a flow channel inside that communicates with the water pipe (33). The nozzle (37) is connected to the flow channel. The spray direction of the nozzle (37) has a tangential component, so that the water flow sprayed from the nozzle (37) can drive the rotating block (36) to rotate around the rotation axis of the connecting rod (35) to clean the fan-shaped plate (1).

5. The air preheater sealing structure according to claim 1, characterized in that, The limiting rod (24) is a pin that passes through the end of the inner rod (22), and both ends of the limiting rod (24) can extend out of the square groove (25).

6. The air preheater sealing structure according to claim 1, characterized in that, The groove wall of the square groove (25) facing the pull ring (27) is a sloping structure, which is used to squeeze the limiting rod (24) when the pull ring (27) is pulled, forcing the limiting rod (24) to retract into the outer rod (21).

7. The air preheater sealing structure according to claim 2, characterized in that, An elastic washer is fixedly connected to one end face of the fixing block (281) facing the sealing sheet (4) to provide cushioning and increase friction when the sealing sheet (4) is pressed.

8. The air preheater sealing structure according to claim 1, characterized in that, The spring (23) is a compression spring, and the two ends of the spring (23) abut against the inner wall step of the outer rod (21) and the flange of the inner rod (22), respectively.

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