Sealing structure of air pre-heater and sealing method thereof

Abstract

The sealing structure comprises a rotor, a plurality of sets of isolation frames are fixedly connected to the outer side of the rotor, a shell is fixedly connected to the other sides of the isolation frames, lifting boxes are slidably connected to the interiors of the isolation frames, and a plurality of sets of sliding rods are slidably connected to the interiors of the upper sides of the lifting boxes; mounting plates are fixedly connected to the upper portions of every two adjacent sliding rods, radial sealing plates are fixedly connected to the upper portions of the mounting plates, first connecting plates are fixedly connected to the lower portions of every two adjacent sliding rods, first springs are fixedly connected between the first connecting plates and the inner wall of the lifting box, and the sliding rods are sleeved with the first springs; a gap sealing plate is connected between every two adjacent radial sealing plates in a sliding mode, the air leakage rate of the air pre-heater is effectively reduced, heat loss is reduced, then the overall heat exchange efficiency of the air pre-heater is improved, and stable operation of a boiler thermodynamic system is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology for power plant boilers, specifically to a sealing structure and sealing method for an air preheater. Background Technology

[0002] Rotary air preheaters are core heat exchange equipment in power plant boilers. Their rotors drive heat storage elements to rotate between the flue gas side and the air side, achieving heat exchange. However, existing air preheater sealing structures have the following key technical defects, leading to excessive air leakage, decreased heat exchange efficiency, and increased energy consumption: Poor radial sealing contact and severe air leakage: Traditional radial sealing plates are mostly integral rigid structures. Due to the high temperature, the air preheater sector plates are prone to deformation, and the integral sealing plate cannot completely fit the sector plates, resulting in gaps and air leakage. Some elastic seals are only supported by a single set of springs, and local gaps still cannot be eliminated. Failure to adapt to thermal expansion and contraction, resulting in widening gaps: During air preheater operation, the rotor and shell undergo thermal expansion and contraction along the radial direction. After the radial sealing plate shifts, new gaps are easily generated between the plates. Traditional seals have no compensation structure, and the air leakage rate continues to increase with operating time. Height difference and flatness issues lead to sealing failure: When there is a height difference between the upper and lower parts of the radial sealing plate due to installation errors or deformation, the gap sealing plate cannot tilt to block it. Moreover, when the sides of the sealing plate move, the upper part is prone to misalignment. There is no flatness protection structure, which further expands the air leakage channel. Summary of the Invention

[0003] The purpose of this invention is to provide a sealing structure and sealing method for an air preheater to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a sealing structure for an air preheater, comprising a rotor, several sets of isolation frames fixedly connected to the outside of the rotor, a housing fixedly connected to the other side of the isolation frames, a lifting box slidably connected inside the isolation frames, several sets of sliding rods slidably connected inside the upper side of the lifting box, an mounting plate fixedly connected to the upper part of two adjacent sets of sliding rods, a radial sealing plate fixedly connected to the upper part of the mounting plate, a first connecting plate fixedly connected to the lower part of two adjacent sets of sliding rods, a first spring fixedly connected between the first connecting plate and the inner wall of the lifting box, the first spring being sleeved on the outside of the sliding rod, a gap sealing plate slidably connected between two adjacent sets of radial sealing plates, a connecting frame fixedly connected to both sides inside the radial sealing plate, two sets of first guide rods fixedly connected inside the connecting frame, a mounting block slidably connected to the outside of the first guide rod, an mounting hole opened on one side of the mounting block, extension plates fixedly connected to both sides of the gap sealing plate, connecting rods with matching mounting holes slidably connected inside both sides of the extension plates, a second spring fixedly connected between the mounting block and the connecting frame, the second spring being sleeved on the outside of the first guide rod.

[0005] Preferably, there is a gap between the upper and lower sides of the gap sealing plate and the inner wall of the radial sealing plate, a number of parallel plates are fixedly connected to the upper part of the gap sealing plate, and a number of connecting holes are opened on both sides of the radial sealing plate, and the parallel plates are slidably connected inside the connecting holes.

[0006] Two sets of second guide rods are fixedly connected to the inner side of the upper part of the radial sealing plate. Two sets of lugs are slidably connected to the outer side of the second guide rods. A baffle is fixedly connected between the lugs on the same side. A third spring is fixedly connected between the lugs and the inner wall of the sealing plate. The third spring is sleeved on the outer side of the second guide rod.

[0007] Preferably, a connecting cylinder is fixedly connected inward to the middle of the gap sealing plate, a first rotating shaft is rotatably connected between the connecting cylinder and the inner wall of the gap sealing plate, a second rotating shaft is rotatably connected inside the gap sealing plate, meshing gears are fixedly connected to the outer sides of the first and second rotating shafts, a second connecting plate is fixedly connected to the inner side of the connecting rod, a threaded rod is threadedly connected inside the second connecting plate, one end of the threaded rod is rotatably connected to the inside of the extension plate, and the other end of the threaded rod is fixedly connected to a third rotating shaft, and transmission belts are respectively sleeved on the outer sides of the first and second rotating shafts on both sides.

[0008] Preferably, the first rotating shaft has follower grooves on both sides of its outer surface, and a sliding plate is slidably connected to the first rotating shaft and the outer side of the follower groove. A toothed ring is fixedly connected to one side of the sliding plate, and a toothed groove that mates with the toothed ring is opened on the inner side of the connecting cylinder. A third guide rod is fixedly connected inside the follower groove, and the third guide rod is slidably connected inside the sliding plate. A fourth spring is fixedly connected between the sliding plate and the inner wall of the follower groove, and the fourth spring is sleeved on the outer side of the third guide rod.

[0009] Preferably, a limiting plate is fixedly connected to one end of the first rotating shaft, and pull rings are fixedly connected to both sides of the sliding plate, with the pull rings disposed between the limiting plate and the inner wall of the connecting cylinder.

[0010] Preferably, a sealing block is sleeved inside the radial sealing plates on both sides, a third connecting plate is fixedly connected to one side of the sealing block, and a plurality of sealing plates with mating connecting holes are fixedly connected to the upper part of the third connecting plate. The third connecting plate and the outer side of the radial sealing plate are provided with mating connecting holes.

[0011] Preferably, a central cylinder seal is fixedly connected to the upper outer side of the rotor, and a bypass seal is fixedly connected to the upper part of the housing. Several sets of positioning grooves are opened on one side of the central cylinder seal and the bypass seal, and a positioning plate is fixedly connected to one side of the third connecting plate. The positioning plate is slidably connected inside the positioning groove.

[0012] Preferably, an upper rotating plate is fixedly connected to the lower part of the lifting box, a push plate is rotatably connected to the outer side of the upper rotating plate, a lower rotating plate is rotatably connected to the inner side of the lower part of the push plate, a sliding block is fixedly connected to the lower part of the lower rotating plate, two sets of fourth guide rods are slidably connected inside the sliding block, the two ends of the fourth guide rods are fixedly connected to the inside of the isolation frame, a fifth spring is fixedly connected to the sliding block and the inside of the isolation frame, and the fifth spring is sleeved on the outer side of the fourth guide rod.

[0013] A sealing method for a sealing structure of an air preheater includes the following steps: S1: Insert a gap sealing plate between two adjacent sets of radial sealing plates, so that the connecting rods inside both sides of the gap sealing plate are inserted into the mounting holes inside the radial sealing plate; S2: Insert sealing blocks and sealing plates into the inner sides of the radial sealing plates on both sides, connect the third connecting plate through the connecting holes, and insert the positioning plate into the positioning groove; S3: When the equipment is running, the centrifugal force drives the sliding block to slide along the fourth guide rod, thereby pushing the lifting box upward through the push plate, so that the radial sealing plate and the gap sealing plate can contact the lower part of the fan frame within the stroke range of the sliding rod, and the elastic compensation of the first spring can ensure that each set of radial sealing plates and gap sealing plates can contact the lower part of the fan frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses multiple sets of first springs to drive the radial sealing plate to fit tightly against the fan-shaped plate. Even if the surface of the fan-shaped plate is uneven, full contact can be achieved through the elastic adjustment of the springs. In conjunction with the gap sealing plate, the gap between the plates caused by thermal expansion and contraction is blocked in real time, which effectively reduces the air preheater leakage rate, reduces heat loss, and thus improves the overall heat exchange efficiency of the air preheater, ensuring the stable operation of the boiler thermal system. 2. The present invention also ensures that the upper part of the radial sealing plate always remains flush through the cooperation of the parallel plate and the connecting hole, and the gap cooperation between the connecting rod and the mounting hole allows the gap sealing plate to tilt and block when there is a height difference between the two sealing plates. It can adapt to the temperature difference deformation during the operation of the air preheater without manual intervention, maintain a stable sealing effect for a long time, and avoid sealing failure due to changes in operating conditions. 3. The present invention also unlocks the shaft by pulling the pull ring, and the connecting rod can be disengaged from the mounting hole by rotating the drive structure. The gap sealing plate can be quickly removed without disassembling a large number of bolts, simplifying the maintenance process. The shaft locking structure can ensure the stability of the position after adjustment, reduce the frequency of secondary maintenance, significantly shorten the equipment downtime for maintenance, and reduce the labor intensity of maintenance personnel. 4. In the working state, the centrifugal force generated by the rotation of the air preheater drives the sliding block to move, causing the lifting box and the radial sealing plate to rise and contact the sector plate; in the non-working state, the spring returns and pulls the sliding block, causing the radial sealing plate to fall and disengage from the sector plate, avoiding unnecessary contact during long-term static placement or transportation, reducing wear on the sealing plate, extending the overall service life of the sealing components, and reducing the cost of later replacement. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is an enlarged view of the structure at point A of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the present invention; Figure 6 This is an enlarged view of the structure at point B of the present invention; Figure 7 This is a three-dimensional cross-sectional view of the present invention; Figure 8 This is an enlarged view of the structure at point C in this invention.

[0016] In the diagram: 1. Rotor; 2. Isolation frame; 3. Housing; 4. Lifting box; 5. Sliding rod; 6. First connecting plate; 7. First spring; 8. Mounting plate; 9. Radial sealing plate; 10. Gap sealing plate; 11. Extension plate; 12. Connecting frame; 13. First guide rod; 14. Mounting block; 15. Mounting hole; 16. Connecting rod; 17. Second spring; 18. Connecting hole; 19. Parallel plate; 20. Bypass seal; 21. Second guide rod; 22. Lug; 23. Baffle; 24. Third spring; 25. Connecting cylinder; 26. First rotating shaft; 27. Second rotating shaft; 28. Connecting gear; 29. ​​Third rotating shaft; 30. Threaded rod; 31. Second connecting plate; 32. Transmission belt; 33. Follower groove; 34. Third guide rod; 35. Sliding plate; 36. Fourth spring; 37. Gear ring; 38. Gear groove; 39. Pull ring; 40. Limiting plate; 41. Sealing block; 42. Sealing plate; 43. Third connecting plate; 44. Connecting hole; 45. Positioning plate; 46. Central cylinder seal; 47. Positioning groove; 48. Upper rotating plate; 49. Push plate; 50. Lower rotating plate; 51. Sliding block; 52. Fourth guide rod; 53. Fifth spring. Detailed Implementation

[0017] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-8 This invention provides a technical solution: a sealing structure for an air preheater, including a rotor 1. Several sets of isolation frames 2 are fixedly connected to the outside of the rotor 1 by welding. A housing 3 is fixedly connected to the side of the isolation frame 2 away from the rotor 1 by screws. A lifting box 4 is slidably connected inside the isolation frame 2 with clearance fit. Several sets of sliding rods 5 are slidably connected to the upper side of the lifting box 4 with clearance fit. An mounting plate 8 is fixedly connected to the upper part of two adjacent sets of sliding rods 5 by welding. A radial sealing plate 9 is threadedly connected to the upper part of the mounting plate 8. A first connecting plate 6 is fixedly connected to the lower part of two adjacent sets of sliding rods 5 by welding. A first spring 7 is spot-welded to the inner wall of the lifting box 4 and is sleeved on the outside of the sliding rods 5. In normal operation, pulling the sliding rods 5 upwards causes the radial sealing plate 9 to be tightly against the lower part of the fan-shaped plate. When the fan-shaped plate is uneven, the corresponding first spring 7 is compressed or stretched, ensuring that each set of radial sealing plates 9 is in contact, improving sealing performance. A gap sealing plate 10 is slidably connected between two adjacent sets of radial sealing plates 9 with clearance fit. The inner sides are fixedly connected to the connecting frame 12 by welding. Inside the connecting frame 12, two sets of first guide rods 13 are fixedly connected by welding. The outer side of the first guide rods 13 is slidably connected to the mounting block 14 by clearance fit. The mounting block 14 has a mounting hole 15 on one side. The gap sealing plate 10 is fixedly connected to the extension plate 11 by welding on both sides. The inner side of the extension plate 11 is slidably connected to the connecting rod 16 by clearance fit. The connecting rod 16 is clearance fit with the mounting hole 15 to realize the connection between the gap sealing plate 10 and the radial sealing plate 9. The mounting block 14 and the connecting frame 12 are fixedly connected by spot welding to the second spring 17. The second spring 17 is sleeved on the outer side of the first guide rod 13. When the radial sealing plate 9 is offset due to thermal expansion and contraction, the gap sealing plate 10 blocks the gap between the two radial sealing plates 9. The second spring 17 pushes the mounting block 14 to keep the gap sealing plate 10 in the middle of the two sets of radial sealing plates 9. When there is a height difference between the two radial sealing plates 9, the gap sealing plate 10 can tilt around the connecting rod 16 to block the gap caused by the height difference and prevent air leakage. A gap is reserved between the upper and lower sides of the gap sealing plate 10 and the inner wall of the radial sealing plate 9 to ensure that the gap sealing plate 10 can be tilted. Several sets of parallel plates 19 are fixedly connected to the upper part of the gap sealing plate 10 by welding. Several sets of connecting holes 18 are opened on both sides of the radial sealing plate 9. The parallel plates 19 are slidably connected to the inside of the connecting holes 18 through a clearance fit. When the radial sealing plate 9 moves on both sides, the parallel plates 19 slide along the connecting holes 18 to ensure that the upper part of the radial sealing plate 9 is flush. Two sets of second guide rods 21 are fixedly connected to the inner side of the upper part of the radial sealing plate 9 by welding. Two sets of lugs 22 are slidably connected to the outer side of the second guide rods 21 by clearance fit. A baffle 23 is fixedly connected between the two sets of lugs 22 on the same side by welding. A third spring 24 is fixedly connected between the lugs 22 and the inner wall of the radial sealing plate 9 by spot welding. The third spring 24 is sleeved on the outer side of the second guide rods 21. Under normal conditions, it pushes the baffle 23 to block the exposed part of the connecting hole 18 to prevent air leakage. A connecting cylinder 25 is welded inward to the center of the gap sealing plate 10. A first rotating shaft 26 is rotatably connected between the connecting cylinder 25 and the inner wall of the gap sealing plate 10 via a deep groove ball bearing. A second rotating shaft 27 is rotatably connected inside the gap sealing plate 10 via a deep groove ball bearing. A meshing linkage gear 28 is fixedly connected to the outer sides of the first rotating shaft 26 and the second rotating shaft 27 via a key. A second connecting plate 31 is welded to the inner side of the connecting rod 16. A threaded rod 30 is threadedly connected inside the second connecting plate 31. One end of the threaded rod 30 is threaded through a deep groove ball bearing. The grooved ball bearing is rotatably connected inside the extension plate 11. The other end of the threaded rod 30 is fixedly connected to the third rotating shaft 29 by welding. The third rotating shaft 29 on both sides is respectively fitted with a transmission belt 32 on the outside of the first rotating shaft 26 and the second rotating shaft 27. Rotating the first rotating shaft 26 drives the second rotating shaft 27 to rotate synchronously through the connecting gear 28. Then, the transmission belt 32 drives the third rotating shaft 29 and the threaded rod 30 to rotate, driving the second connecting plate 31 and the connecting rod 16 to move, so that the connecting rod 16 can be disengaged from or inserted into the mounting hole 15, making it convenient to remove the gap sealing plate 10. Follower grooves 33 are provided on both sides of the outer side of the first rotating shaft 26. A sliding plate 35 is slidably connected to the outer side of the first rotating shaft 26 and the follower groove 33 with clearance fit. A toothed ring 37 is fixedly connected to one side of the sliding plate 35 by welding. An arc-shaped internal gear with a toothed groove 38 that matches the toothed ring 37 is provided on the inner side of the connecting cylinder 25. A third guide rod 34 is fixedly connected to the inside of the follower groove 33 by welding. The third guide rod 34 is slidably connected to the inside of the sliding plate 35 with clearance fit. A fourth spring 36 is fixedly connected between the sliding plate 35 and the inner wall of the follower groove 33 by spot welding. The fourth spring 36 is sleeved on the outer side of the third guide rod 34. Under normal conditions, the fourth spring 36 pushes the toothed ring 37 to mesh with the toothed groove 38 to lock the first rotating shaft 26 and prevent loosening. Pulling the sliding plate 35 can disengage the toothed ring 37 from the toothed groove 38 and unlock the rotating shaft. A limiting plate 40 is fixedly welded to one end of the first rotating shaft 26 to prevent the sliding piece 35 from disengaging from the first rotating shaft 26. Pull rings 39 are fixedly welded to both sides of the sliding piece 35. The pull rings 39 are located between the limiting plate 40 and the inner wall of the connecting cylinder 25, so that the sliding piece 35 can be pulled out and rotated through the pull rings 39, thereby controlling the first rotating shaft 26. A sealing block 41 is slidably connected to the inside of the radial sealing plates 9 on both sides through a clearance fit. A third connecting plate 43 is fixedly connected to one side of the sealing block 41 by welding. Several sets of sealing plates 42 are fixedly connected to the upper part of the third connecting plate 43 by welding. The sealing plates 42 are slidably connected to the inside of the connecting hole 18 through a clearance fit, blocking the connecting hole 18 of the outermost radial sealing plates 9. The third connecting plate 43 and the outer side of the radial sealing plates 9 have mutually matching connecting holes 44, which are fixedly connected by screws. A central cylinder seal 46 is fixedly connected to the upper outer side of the rotor 1 by screws, and a bypass seal 20 is fixedly connected to the upper part of the housing 3 by screws. Several sets of positioning grooves 47 are opened on one side of the central cylinder seal 46 and the bypass seal 20. A positioning plate 45 is fixedly connected to one side of the third connecting plate 43 by welding. The positioning plate 45 is slidably connected to the inside of the positioning groove 47 by clearance fit to prevent the outermost radial sealing plates 9 from moving with thermal expansion and contraction. The lower part of the lifting box 4 is fixedly connected to the upper rotating plate 48 by welding. The outer side of the upper rotating plate 48 is rotatably connected to the push plate 49 by a pin. The inner side of the lower part of the push plate 49 is rotatably connected to the lower rotating plate 50 by a pin. The lower part of the lower rotating plate 50 is fixedly connected to the lower part by welding. The sliding block 51 is slidably connected to the sliding block 51 by clearance fit with two sets of fourth guide rods 52. The two ends of the fourth guide rods 52 are fixedly connected to the interior of the isolation frame 2 by welding. The sliding block 51 and the interior of the isolation frame 2 are fixedly connected by spot welding with a fifth spring 53. The fifth spring 53 is sleeved on the outer side of the fourth guide rod 52. When the air preheater rotates, the centrifugal force causes the sliding block 51 to move outward along the fourth guide rod 52, pushing the push plate 49 to drive the lifting box 4 to rise. The radial sealing plate 9 contacts the fan plate to work. When the machine stops, the fifth spring 53 pulls back the sliding block 51, the lifting box 4 descends, and the radial sealing plate 9 disengages from the fan plate to reduce wear. A sealing method for a sealing structure of an air preheater includes the following steps: S1: Insert a gap sealing plate 20 between two adjacent sets of radial sealing plates 9 to ensure that when the equipment undergoes radial thermal expansion and contraction, the gap sealing plate 20 can block the gap between the two radial sealing plates 9. The connecting rods 16 inside the two sides of the gap sealing plate 20 are inserted into the mounting holes 15 inside the radial sealing plate 9. This ensures that when the wear degree of the lower part of the fan-shaped plate is different, multiple sets of radial sealing plates 9 can be adjusted to fit the lower part of the fan-shaped plate to ensure sealing. When there is a height difference between two adjacent sets of radial sealing plates 19, the gap sealing plate 20 will tilt accordingly to seal the connection. S2: Insert sealing blocks 41 and sealing plates 42 into the inner sides of the two outermost radial sealing plates 9, and connect the third connecting plate 43 through the connecting hole 44. Insert the positioning plate 45 into the positioning groove 47 to limit the position of the two outermost radial sealing plates 9, so as to ensure that the two outermost radial sealing plates 9 do not have gaps with the sides due to thermal expansion and contraction, thereby improving the sealing performance of the sides. S3: When the equipment is running, the centrifugal force drives the sliding block 51 to slide along the fourth guide rod 52, thereby pushing the lifting box 4 upward through the push plate 49, so that the radial sealing plate 9 and the gap sealing plate 10 can contact the lower part of the fan frame within the stroke range of the sliding rod 5, realizing the contact switching between working and non-working, and through the elastic compensation of the first spring 7, each set of radial sealing plates 9 and gap sealing plates 10 can contact the lower part of the fan frame.

[0019] Working principle: When the invention is in use, the air preheater is started, the rotor 1 rotates to generate centrifugal force, the sliding block 51 moves outward along the fourth guide rod 52, pushes the push plate 49 to rotate around the pin shaft, drives the lifting box 4 to rise along the isolation frame 2, and the radial sealing plate 9 moves upward accordingly. The first spring 7 pushes the sliding rod 5 upward, so that the wear-resistant ceramic sheet at the bottom of each set of radial sealing plates 9 is in close contact with the fan-shaped plate. When the fan-shaped plate is uneven, the corresponding first spring 7 is compressed or stretched to ensure full contact. During radial thermal expansion and contraction, the radial sealing plate 9 shifts, the gap sealing plate 10 blocks the gap between the plates, and the parallel plate 19 slides along the connecting hole 18 to ensure that the upper part of the radial sealing plate 9 is flush; when there is a height difference between the radial sealing plates 9, the gap sealing plate 10 tilts around the connecting rod 16 to block it; the third spring 24 pushes the baffle 23 to block the exposed part of the connecting hole 18; the toothed ring 37 engages with the toothed groove 38 to lock the rotating shaft to prevent loosening. When the air preheater is shut down, rotor 1 stops rotating, centrifugal force disappears, fifth spring 53 pulls back sliding block 51, push plate 49 rotates in the opposite direction, lifting box 4 descends along isolation frame 2, radial sealing plate 9 disengages from sector plate, avoiding static wear. Pulling the pull rings 39 on both sides of the sliding plate 35 stretches the fourth spring 36, disengaging the toothed ring 37 from the toothed groove 38 and unlocking the first rotating shaft 26; rotating the first rotating shaft 26 drives the second rotating shaft 27 through the connecting gear 28, and the transmission belt 32 drives the third rotating shaft 29 and the threaded rod 30 to rotate, causing the second connecting plate 31 to drive the connecting rod 16 to move inward and disengage from the mounting hole 15; pulling out the gap sealing plate 10, replacing the worn parts, reversing the operation to reset, and the toothed ring 37 re-engages with the toothed groove 38 to lock.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0021] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for an air preheater, comprising a rotor (1), characterized in that: Several sets of isolation frames (2) are fixedly connected to the outside of the rotor (1). A housing (3) is fixedly connected to the other side of the isolation frame (2). A lifting box (4) is slidably connected inside the isolation frame (2). Several sets of sliding rods (5) are slidably connected inside the upper side of the lifting box (4). An mounting plate (8) is fixedly connected to the upper part of two adjacent sets of sliding rods (5). A radial sealing plate (9) is fixedly connected to the upper part of the mounting plate (8). A first connecting plate (6) is fixedly connected to the lower part of two adjacent sets of sliding rods (5). A first spring (7) is fixedly connected between the first connecting plate (6) and the inner wall of the lifting box (4). The first spring (7) is sleeved on the outside of the sliding rod (5). A gap sealing plate (10) is slidably connected between the radial sealing plate (9) and the connecting frame (12) is fixedly connected to both sides inside the radial sealing plate (9). Two sets of first guide rods (13) are fixedly connected inside the connecting frame (12). An mounting block (14) is slidably connected to the outside of the first guide rod (13). An mounting hole (15) is opened on one side of the mounting block (14). An extension plate (11) is fixedly connected to both sides of the gap sealing plate (10). A connecting rod (16) that matches the mounting hole (15) is slidably connected inside both sides of the extension plate (11). A second spring (17) is fixedly connected between the mounting block (14) and the connecting frame (12). The second spring (17) is sleeved on the outside of the first guide rod (13).

2. The sealing structure of an air preheater according to claim 1, characterized in that: There is a gap between the upper and lower sides of the gap sealing plate (10) and the inner wall of the radial sealing plate (9). Several sets of parallel plates (19) are fixedly connected to the upper part of the gap sealing plate (10). Several sets of connecting holes (18) are opened on both sides of the radial sealing plate (9). The parallel plates (19) are slidably connected inside the connecting holes (18).

3. The sealing structure of an air preheater according to claim 1 is characterized in that: Two sets of second guide rods (21) are fixedly connected to the inner side of the upper part of the radial sealing plate (9). Two sets of lugs (22) are slidably connected to the outer side of the second guide rods (21). A baffle (23) is fixedly connected between the lugs (22) on the same side. A third spring (24) is fixedly connected between the lugs (22) and the inner wall of the sealing plate (9). The third spring (24) is sleeved on the outer side of the second guide rods (21).

4. The sealing structure of an air preheater according to claim 1, characterized in that: A connecting cylinder (25) is fixedly connected inward to the middle of the gap sealing plate (10). A first rotating shaft (26) is rotatably connected between the connecting cylinder (25) and the inner wall of the gap sealing plate (10). A second rotating shaft (27) is rotatably connected inside the gap sealing plate (10). A meshing connecting gear (28) is fixedly connected to the outer side of the first rotating shaft (26) and the second rotating shaft (27). A second connecting plate (31) is fixedly connected to the inner side of the connecting rod (16). A threaded rod (30) is threadedly connected inside the second connecting plate (31). One end of the threaded rod (30) is rotatably connected to the inside of the extension plate (11). The other end of the threaded rod (30) is fixedly connected to a third rotating shaft (29). The third rotating shafts (29) on both sides are respectively fitted with transmission belts (32) on the outer side of the first rotating shaft (26) and the second rotating shaft (27).

5. The sealing structure of an air preheater according to claim 4, characterized in that: The first rotating shaft (26) has follower grooves (33) on both sides of its outer side. The first rotating shaft (26) and the follower groove (33) are slidably connected to a sliding piece (35). A toothed ring (37) is fixedly connected to one side of the sliding piece (35). A toothed groove (38) that matches the toothed ring (37) is opened on the inner side of the connecting cylinder (25). A third guide rod (34) is fixedly connected inside the follower groove (33). The third guide rod (34) is slidably connected inside the sliding piece (35). A fourth spring (36) is fixedly connected between the sliding piece (35) and the inner wall of the follower groove (33). The fourth spring (36) is sleeved on the outer side of the third guide rod (34).

6. The sealing structure of an air preheater according to claim 5, characterized in that: One end of the first rotating shaft (26) is fixedly connected to a limiting plate (40), and pull rings (39) are fixedly connected to both sides of the sliding plate (35). The pull rings (39) are located between the limiting plate (40) and the inner wall of the connecting cylinder (25).

7. The sealing structure of an air preheater according to claim 2, characterized in that: A sealing block (41) is fitted inside the radial sealing plate (9) on both sides. A third connecting plate (43) is fixedly connected to one side of the sealing block (41). A number of sealing plates (42) with matching connecting holes (18) are fixedly connected to the upper part of the third connecting plate (43). The third connecting plate (43) and the outer side of the radial sealing plate (9) are provided with matching connecting holes (44).

8. The sealing structure of an air preheater according to claim 7, characterized in that: A central cylinder seal (46) is fixedly connected to the upper outer side of the rotor (1), and a bypass seal (20) is fixedly connected to the upper part of the housing (3). Several sets of positioning grooves (47) are opened on one side of the central cylinder seal (46) and the bypass seal (20). A positioning plate (45) is fixedly connected to one side of the third connecting plate (43). The positioning plate (45) is slidably connected to the inside of the positioning groove (47).

9. The sealing structure of an air preheater according to claim 1, characterized in that: The lower part of the lifting box (4) is fixedly connected to an upper rotating plate (48), and a push plate (49) is rotatably connected to the outer side of the upper rotating plate (48). The lower inner side of the push plate (49) is rotatably connected to a lower rotating plate (50). The lower part of the lower rotating plate (50) is fixedly connected to a sliding block (51). Two sets of fourth guide rods (52) are slidably connected inside the sliding block (51). The two ends of the fourth guide rods (52) are fixedly connected to the inside of the isolation frame (2). The sliding block (51) and the isolation frame (2) are fixedly connected to a fifth spring (53). The fifth spring (53) is sleeved on the outer side of the fourth guide rod (52).

10. A sealing structure for an air preheater according to claims 1-9, and a sealing method for the sealing structure of the air preheater, characterized in that: Includes the following steps: S1: Insert a gap sealing plate (20) between two adjacent sets of radial sealing plates (9) so that the connecting rods (16) inside both sides of the gap sealing plate (20) are inserted into the mounting holes (15) inside the radial sealing plate (9). S2: Insert sealing blocks (41) and sealing plates (42) into the inner sides of the radial sealing plates (9) on both sides, and connect the third connecting plate (43) through the connecting hole (44), and insert the positioning plate (45) into the positioning groove (47); S3: When the equipment is running, the centrifugal force drives the sliding block (51) to slide along the fourth guide rod (52), thereby pushing the lifting box (4) upward through the push plate (49), so that the radial sealing plate (9) and the gap sealing plate (10) can contact the lower part of the fan frame within the stroke range of the sliding rod (5), and through the elastic compensation of the first spring (7), each set of radial sealing plates (9) and gap sealing plates (10) can contact the lower part of the fan frame.

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