A rotating shaft sealing structure of an air suction fan

Abstract

The utility model relates to sealing structure technical field and disclose a kind of rotary shaft sealing structure of induced draft fan, the sealing structure includes female clamp ring, male clamp ring, and the packing ring that is clamped between male clamp ring and female clamp ring and surrounds and wraps rotary shaft, female clamp ring includes the first sub half ring and second sub half ring of being able to splice or separate, male clamp ring includes the third sub half ring and fourth sub half ring of being able to splice or separate, and the male clamp ring and female clamp ring are detachably connected.Cleverly the male clamp ring and female clamp ring are designed as the sub half ring structure of being able to splice, without removing bearing and unloading rotary shaft when installing, also without reforming to machine case structure, directly splice installation in rotary shaft original position, greatly reduce the workload and time consumption of improvement process, reduce the influence time to the normal operation of equipment.Packing ring is clamped under the male clamp ring and female clamp ring, can be closely fitted rotary shaft, effectively block air leakage point, guarantee induced draft fan long-term stable operation.

Description

Technical Field

[0001] This utility model relates to the field of sealing structure technology, and in particular to a rotating shaft sealing structure for an induced draft fan. Background Technology

[0002] The induced draft fan precisely controls the airflow to the waste incinerator by adjusting the opening of multiple internal rotatable dampers, ensuring a stable and efficient incineration process. Typically, each damper is mounted on a rotating shaft that runs horizontally through the casing and side panels, rotating smoothly with the help of bearings on the side panels. Multiple rotating shafts are connected by a transmission structure, enabling synchronous adjustment of multiple dampers.

[0003] In existing induced draft fan designs, a metal sealing ring is installed at the connection between the casing and the rotating shaft to prevent gas leakage within the casing. However, during long-term operation, if the rotating shaft is in close contact with the metal ring, it is prone to severe wear, which in turn affects the equipment's lifespan and operational stability. Therefore, in actual operation, a tight contact cannot be achieved between the sealing ring and the rotating shaft, leading to air leakage. The leaked airflow not only blows along the rotating shaft towards the bearings and side plates, but over time, it can cause bearing corrosion and damage, resulting in jamming of the damper plates and, in severe cases, even equipment failure. Furthermore, the induced draft fan has multiple connection points between the rotating shaft and the casing. If multiple leakage points exist, the induced draft fan needs to consume more energy to maintain the required airflow, significantly increasing energy consumption and reducing energy efficiency.

[0004] To address the air leakage problem of the induced draft fan's rotating shaft, patent publication number CN117823449A proposes installing a sealing ring and elastic element on the rotating shaft to seal the leakage points. However, this solution has significant drawbacks. During implementation, the bearings on the side plates obstruct the installation, preventing direct installation of the sealing ring and elastic element. The bearings must be removed, the rotating shaft taken off, and the chassis structure must be modified to provide support for the sealing ring and elastic element. This entire improvement process is extremely labor-intensive, time-consuming, and disrupts normal equipment operation for an extended period. Furthermore, when the sealing ring wears out and requires replacement, the same complex disassembly and assembly steps must be repeated, resulting in high maintenance difficulty and cost, severely impacting the continuous and stable operation of the equipment.

[0005] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a rotary shaft sealing structure that is easy to improve and maintain, so as to solve the air leakage problem of the induced draft fan.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A rotary shaft sealing structure for an induced draft fan includes a fan housing, a side plate disposed on an outer side of the housing, a rotary shaft transversely penetrating the housing and the side plate, and a sealing structure. The side plate forms a gap with the outer wall of the housing. The rotary shaft is rotatably connected to the side plate via a bearing. The sealing structure includes a female clamping ring fitted on the rotary shaft and close to the outer wall of the housing, a male clamping ring fitted on the rotary shaft and mating with the female clamping ring, and packing material sandwiched between the male and female clamping rings and surrounding the rotary shaft. The female clamping ring includes a first and a second sub-half-ring that can be spliced ​​or separated, and the male clamping ring includes a third and a fourth sub-half-ring that can be spliced ​​or separated. The male and female clamping rings are detachably connected.

[0008] As a further improvement to the above technical solution, the inner rings of the first and second sub-half-rings are both provided with semi-circular positioning grooves, and the two semi-circular positioning grooves form a positioning groove for the packing to be embedded; the inner rings of the third and fourth sub-half-rings are both provided with semi-circular pressure rings, and the two semi-circular pressure rings form a pressure ring that cooperates with the positioning groove and presses the packing.

[0009] As a further improvement to the above technical solution, a first slot is provided on both ends of the first sub-half ring, and a first protrusion that engages with the first slot is provided on both ends of the second sub-half ring; a second slot is provided on both ends of the third sub-half ring, and a second protrusion that engages with the second slot is provided on both ends of the fourth sub-half ring.

[0010] As a further improvement to the above technical solution, the splicing position of the male clamping ring is circumferentially misaligned with the splicing position of the female clamping ring. The outer peripheral wall of the third sub-ring is provided with two first through-hole lugs. The first sub-ring and the second sub-ring are respectively provided with a first threaded lug corresponding to one of the first through-hole lugs. A first bolt is inserted into each first through-hole lug and connected to the corresponding first threaded lug. The outer peripheral wall of the fourth sub-ring is provided with two second through-hole lugs. The first sub-ring and the second sub-ring are respectively provided with a second threaded lug corresponding to one of the second through-hole lugs. A second bolt is inserted into each second through-hole lug and connected to the corresponding second threaded lug.

[0011] As a further improvement to the above technical solution, the splicing position of the male clamping ring and the splicing position of the female clamping ring are circumferentially misaligned. The outer peripheral wall of the third sub-half-ring is provided with two first locking blocks. The first sub-half-ring and the second sub-half-ring are respectively provided with a first fastening ear corresponding to one of the first locking blocks. Each first locking block is engaged with the corresponding first fastening ear. The outer peripheral wall of the fourth sub-half-ring is provided with two second locking blocks. The first sub-half-ring and the second sub-half-ring are respectively provided with a second fastening ear corresponding to one of the second locking blocks. Each second locking block is engaged with the corresponding second fastening ear.

[0012] As a further improvement to the above technical solution, the first protrusion is in the shape of an isosceles trapezoid and the plane containing the short side of the isosceles trapezoid is fixedly connected to the end face of the second sub-half-ring, and the shape of the first slot is a structure adapted to the shape of the first protrusion; the second protrusion is in the shape of an isosceles trapezoid and the plane containing the short side of the isosceles trapezoid is fixedly connected to the end face of the fourth sub-half-ring, and the shape of the second slot is a structure adapted to the shape of the second protrusion.

[0013] As a further improvement to the above technical solution, each of the first and second sub-half rings is provided with a third threaded lug, the third sub-half ring is provided with a third through-hole lug corresponding to the third threaded lug of the first sub-half ring, and the fourth sub-half ring is provided with a third through-hole lug corresponding to the third threaded lug of the second sub-half ring. A third bolt is inserted into each third through-hole lug and connected to the corresponding third threaded lug.

[0014] As a further improvement to the above technical solution, each of the first and second sub-half rings is provided with a third fastening ear, the third sub-half ring is provided with a third locking block corresponding to the third fastening ear of the first sub-half ring, and the fourth sub-half ring is provided with a third locking block corresponding to the third fastening ear of the second sub-half ring. Each third locking block is engaged with the corresponding third fastening ear.

[0015] As a further improvement to the above technical solution, the female clamping ring is fixed to the outer wall of the chassis by spot welding.

[0016] As a further improvement to the above technical solution, a plurality of strong magnets are provided on the end face of the female clamping ring that connects to the outer side wall of the chassis. The strong magnets are used to attract the female clamping ring to the outer side wall of the chassis.

[0017] Beneficial effects: The rotary shaft sealing structure provided by this utility model can achieve rapid improvement without altering the original induced draft fan structure. It cleverly designs the male and female clamping rings as splicable sub-half-ring structures, eliminating the need to remove the bearings or detach the rotary shaft during installation, as well as modifying the casing structure. It can be directly spliced ​​and installed in the original position on the rotary shaft, greatly reducing the workload and time required for the improvement process and minimizing the impact on normal equipment operation. Under the clamping of the male and female clamping rings, the packing packing can tightly fit the rotary shaft, effectively sealing leaks and preventing leaked air from corroding and damaging the bearings and side plates. It also prevents the damper from jamming, reducing equipment failures and ensuring the long-term stable operation of the induced draft fan.

[0018] When the packing material wears out and needs maintenance and replacement, simply disconnect the male and female clamping rings, separate the third and fourth sub-rings of the male clamping ring to expose the packing material, replace the packing material, and then reassemble and fix it. There is no need to repeat the complicated disassembly and assembly steps, which reduces the difficulty and cost of maintenance and ensures the continuous and stable operation of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the rotating shaft sealing structure of the first type of induced draft fan.

[0020] Figure 2 The first type of sealing structure is three-dimensional. Figure 1 .

[0021] Figure 3 The first type of sealing structure is three-dimensional. Figure 2 .

[0022] Figure 4 Explosion of the first type of sealing structure Figure 1 .

[0023] Figure 5 Explosion of the first type of sealing structure Figure 2 .

[0024] Figure 6 This is a schematic diagram of the rotating shaft sealing structure of the second type of induced draft fan.

[0025] Figure 7 For the second type of sealing structure, a three-dimensional Figure 1 .

[0026] Figure 8 Explosion of the second type of sealing structure Figure 1 .

[0027] Figure 9 Explosion of the second type of sealing structure Figure 2 .

[0028] Key component symbols: 11-Chassis, 12-Side plate, 13-Rotating shaft, 14-Bearing, 15-Damper baffle, 2-Sealing structure, 21-Female clamping ring, 211-First sub-half ring, 212-Second sub-half ring, 213-Semi-circular positioning groove, 214-First slot, 215-First protrusion, 216-First threaded ear, 217-Second threaded ear, 218-Third threaded ear, 22-Male clamping ring, 221-Third sub-half ring, 222-Fourth sub-half ring, 223-Semi-circular pressure ring, 224-Second slot, 225-Second protrusion, 226-First through-hole ear, 227-Second through-hole ear, 228-Third through-hole ear, 23-Packing packing, 24-First bolt, 25-Second bolt, 26-Third bolt, 27-Strong magnet. Detailed Implementation

[0029] This utility model provides a rotating shaft sealing structure for an induced draft fan. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0030] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0031] Please see Figure 1 , Figure 2 , Figure 6 and Figure 7 This utility model provides a rotating shaft sealing structure for an induced draft fan, including a fan housing 11, a side plate 12 disposed on an outer side of the housing 11, a rotating shaft 13 transversely penetrating the housing 11 and the side plate 12, and a sealing structure 2. The side plate 12 forms a gap with the outer wall of the housing 11. The rotating shaft 13 is rotatably connected to the side plate 12 via a bearing 14. The sealing structure 2 includes a female clamping ring 21 sleeved on the rotating shaft 13 and close to the outer wall of the housing 11, a male clamping ring 22 sleeved on the rotating shaft 13 and mating with the female clamping ring 21, and packing 23 sandwiched between the male clamping ring 22 and the female clamping ring 21 and surrounding the rotating shaft 13. The female clamping ring 21 includes a first sub-half ring 211 and a second sub-half ring 212 that can be spliced ​​or separated. The male clamping ring 22 includes a third sub-half ring 221 and a fourth sub-half ring 222 that can be spliced ​​or separated. The male clamping ring 22 and the female clamping ring 21 are detachably connected.

[0032] When installing the sealing structure 2, firstly, the first half-ring 211 and the second half-ring 212 of the female clamping ring 21 are spliced ​​on the rotating shaft 13, so that they are close to the outer wall of the casing 11 for fixation; then, the packing 23 is wrapped around the rotating shaft 13 and placed on the mating surface of the female clamping ring 21; finally, the third half-ring 221 and the fourth half-ring 222 of the male clamping ring 22 are spliced ​​on the outside of the packing 23, so that the male clamping ring 22 and the female clamping ring 21 are precisely mated to form a whole. It can be understood that the male clamping ring 22 and the female clamping ring 21 are sleeved on the outer periphery of the rotating shaft 13 and will not contact the rotating shaft 13, thus not interfering with the rotation of the rotating shaft 13.

[0033] The male clamping ring 22 and the female clamping ring 21 are detachably connected by connecting components (such as bolts or clips). The clamping force of the two is used to compress the packing 23, so that the packing 23 fits tightly against the surface of the rotating shaft 13 and the inner wall of the male clamping ring 22 and the female clamping ring 21, forming an annular sealing strip, blocking the leakage path of airflow in the chassis 11 along the gap between the rotating shaft 13 and the chassis.

[0034] When the rotating shaft 13 rotates, the flexible packing 23 always maintains close contact with the rotating shaft 13 under the action of clamping force. It compensates for the small radial runout of the rotating shaft 13 through its own elastic deformation, and continuously maintains the sealing state. This not only avoids the serious wear of the rotating shaft 13 caused by rigid contact, but also effectively blocks air leakage.

[0035] The rotary shaft sealing structure provided by this utility model can achieve rapid improvement without altering the original induced draft fan structure. It cleverly designs the male clamping ring 22 and female clamping ring 21 as a splicable sub-half-ring structure. During installation, there is no need to remove the bearing 14 or detach the rotary shaft 13, nor to modify the structure of the casing 11. It can be directly spliced ​​and installed in the original position on the rotary shaft 13, greatly reducing the workload and time spent in the improvement process and minimizing the impact on normal equipment operation. Under the clamping of the male clamping ring 22 and female clamping ring 21, the packing 23 can tightly fit the rotary shaft 13, effectively sealing air leakage points, preventing leaked airflow from causing corrosion damage to the bearing 14 and side plate 12, preventing the damper baffle 15 from jamming, reducing equipment failures, and ensuring the long-term stable operation of the induced draft fan.

[0036] When the packing 23 wears out and needs maintenance and replacement, simply disconnect the male clamping ring 22 and the female clamping ring 21, separate the third half ring 221 and the fourth half ring 222 of the male clamping ring 22 to expose the packing 23, replace the packing 23 and reassemble and fix it. There is no need to repeat the complicated disassembly and assembly steps, which reduces the difficulty and cost of maintenance and ensures the continuous and stable operation of the equipment.

[0037] For details, please refer to Figures 2 to 5The inner rings of the first sub-ring 211 and the second sub-ring 212 are each provided with a semi-circular positioning groove 213. The two semi-circular positioning grooves 213 form a positioning groove for the packing 23 to be embedded. The positioning groove can accurately guide the packing 23 to be embedded and achieve circumferential positioning, avoiding offset or misalignment during installation. At the same time, the inner rings of the third sub-ring 221 and the fourth sub-ring 222 are each provided with a semi-circular pressure ring 223. The two semi-circular pressure rings 223 form a pressure ring that cooperates with the positioning groove and presses the packing 23. The pressure ring can form a uniform and stable radial pressure force on the packing 23, ensuring that the packing 23 is tightly fitted with the rotating shaft 13, the male clamping ring 22 and the female clamping ring 21, further reducing the risk of air leakage and significantly improving the reliability of the sealing structure 2.

[0038] Furthermore, each of the two ends of the first sub-ring 211 is provided with a first groove 214, and each of the two ends of the second sub-ring 212 is provided with a first protrusion 215 that engages with the first groove 214. This concave-convex mating structure provides a precise positioning reference for the splicing of the first sub-ring 211 and the second sub-ring 212. During installation, the operator does not need to repeatedly adjust the relative position of the sub-rings. The accurate combination of the first sub-ring 211 and the second sub-ring 212 can be achieved through the quick docking of the concave-convex structure, which greatly reduces the calibration time during the splicing process. At the same time, it effectively prevents the mother clamping ring 21 from circumferentially misaligning or axially shifting due to vibration, centrifugal force, and other factors during the operation of the rotating shaft 13, ensuring the integrity of the mother clamping ring 21, providing a continuous and stable clamping force for the packing 23, and further ensuring the reliability of the sealing structure 2.

[0039] Similarly, the third sub-ring 221 has a second slot 224 on both ends, and the fourth sub-ring 222 has a second protrusion 225 on both ends that engages with the second slot 224.

[0040] If the first protrusion 215 and the second protrusion 225 are square, and the first slot 214 and the second slot 224 are square, after the first sub-ring 211 and the second sub-ring 212 are spliced ​​together, since no separation constraint structure is formed, the first sub-ring 211 and the second sub-ring 212 can separate on their own. Therefore, it is necessary to use the third sub-ring 221 and the fourth sub-ring 222 to restrict the separation of the first sub-ring 211 and the second sub-ring 212.

[0041] See Figure 2As shown, in one embodiment, the splicing position of the male clamping ring 22 is circumferentially misaligned with the splicing position of the female clamping ring 21. The outer peripheral wall of the third sub-ring 221 is provided with two first through-hole ears 226. The first sub-ring 211 and the second sub-ring 212 are respectively provided with a first threaded ear 216 corresponding to one of the first through-hole ears 226. A first bolt 24 is inserted into each first through-hole ear 226 and connected to the corresponding first threaded ear 216. The outer peripheral wall of the fourth sub-ring 222 is provided with two second through-hole ears 227. The first sub-ring 211 and the second sub-ring 212 are respectively provided with a second threaded ear 217 corresponding to one of the second through-hole ears 227. A second bolt 25 is inserted into each second through-hole ear 227 and connected to the corresponding second threaded ear 217.

[0042] Since the first sub-ring 211 and the second sub-ring 212 of the female clamping ring 21 lack their own separation constraint structure after being spliced, they need to rely on the male clamping ring 22 for positioning. The splicing positions of the male clamping ring 22 and the female clamping ring 21 are circumferentially offset. This offset design allows the sub-rings of the male clamping ring 22 to form cross constraints on the sub-rings of the female clamping ring 21. During installation, the two first through-hole ears 226 on the outer peripheral wall of the third sub-ring 221 correspond to the first threaded ears 216 of the first sub-ring 211 and the second sub-ring 212, respectively, and are connected and fixed by the first bolt 24; the two second through-hole ears 227 on the outer peripheral wall of the fourth sub-ring 222 correspond to the second threaded ears 217 of the first sub-ring 211 and the second sub-ring 212, respectively, and are connected and fixed by the second bolt 25. With the help of the bolt tightening force, the third sub-ring 221 and the fourth sub-ring 222 of the male clamping ring 22 tightly clamp the first sub-ring 211 and the second sub-ring 212 of the female clamping ring 21, restricting their self-separation. At the same time, the packing 23 is tightly attached to the outer wall of the rotating shaft 13 and the housing 11 under the clamping force of the two, thus achieving a seal.

[0043] In another embodiment, the splicing position of the male clamping ring 22 is circumferentially misaligned with the splicing position of the female clamping ring 21. The outer peripheral wall of the third sub-half-ring 221 is provided with two first locking blocks. The first sub-half-ring 211 and the second sub-half-ring 212 are respectively provided with a first fastening ear corresponding to one of the first locking blocks, and each first locking block is engaged with the corresponding first fastening ear. The outer peripheral wall of the fourth sub-half-ring 222 is provided with two second locking blocks. The first sub-half-ring 211 and the second sub-half-ring 212 are respectively provided with a second fastening ear corresponding to one of the second locking blocks, and each second locking block is engaged with the corresponding second fastening ear.

[0044] Since the first sub-ring 211 and the second sub-ring 212 of the female clamping ring 21 lack their own separation constraint structure after being spliced, they need to rely on the male clamping ring 22 for limiting. The splicing positions of the male clamping ring 22 and the female clamping ring 21 are circumferentially offset. This offset design allows the sub-rings of the male clamping ring 22 to form cross constraints on the sub-rings of the female clamping ring 21. During installation, the two first locking blocks on the outer peripheral wall of the third sub-ring 221 respectively engage with the first fastening lugs of the first sub-ring 211 and the second sub-ring 212, and the two second locking blocks on the outer peripheral wall of the fourth sub-ring 222 respectively engage with the second fastening lugs of the first sub-ring 211 and the second sub-ring 212. With the help of the locking force of the snap-fit ​​structure, the third sub-half ring 221 and the fourth sub-half ring 222 of the male clamping ring 22 tightly clamp the first sub-half ring 211 and the second sub-half ring 212 of the female clamping ring 21, restricting their self-separation. At the same time, the packing 23 is tightly attached to the outer wall of the rotating shaft 13 and the housing 11 under the clamping force of the two, thus achieving a seal.

[0045] See Figures 7 to 9 As shown, if the first protrusion 215 is an isosceles trapezoid and the plane containing the short side of the isosceles trapezoid is fixed to the end face of the second sub-half-ring 212, the shape of the first slot 214 is adapted to the shape of the first protrusion 215; the second protrusion 225 is an isosceles trapezoid and the plane containing the short side of the isosceles trapezoid is fixed to the end face of the fourth sub-half-ring 222, and the shape of the second slot 224 is adapted to the shape of the second protrusion 225. After the first protrusion 215 is engaged with the first slot 214 and the second protrusion 225 is engaged with the second slot 224, the male clamping ring 22 and the female clamping ring 21 will generate radial constraints, preventing the first sub-half-ring 211 and the second sub-half-ring 212, and the third sub-half-ring 221 and the fourth sub-half-ring 222 from separating themselves without external force, ensuring the overall structural stability of the female clamping ring 21 and the male clamping ring 22, and providing a continuous and reliable clamping foundation for the packing 23.

[0046] In one embodiment, the first sub-ring 211 and the second sub-ring 212 are each provided with a third threaded lug 218. The third sub-ring 221 is provided with a third through-hole lug 228 corresponding to the third threaded lug 218 of the first sub-ring 211. The fourth sub-ring 222 is provided with a third through-hole lug 228 corresponding to the third threaded lug 218 of the second sub-ring 212. A third bolt 26 is inserted into each third through-hole lug 228 and connected to the corresponding third threaded lug 218. The first sub-ring 211 and the second sub-ring 212 of the female clamping ring 21 cannot separate themselves after being engaged with the first slot 214 by the first protrusion 215 of the isosceles trapezoid. Similarly, the third sub-ring 221 and the fourth sub-ring 222 of the male clamping ring 22 cannot separate themselves after being engaged with the second slot 224 by the second protrusion 225 of the isosceles trapezoid. Based on this, the first sub-ring 211 and the second sub-ring 212 are each provided with a third threaded lug 218, the third sub-ring 221 is provided with a third through-hole lug 228 corresponding to the third threaded lug 218 of the first sub-ring 211, and the fourth sub-ring 222 is provided with a third through-hole lug 228 corresponding to the third threaded lug 218 of the second sub-ring 212. During installation, the third bolt 26 is passed through the third through-hole lug 228 and connected and tightened with the corresponding third threaded lug 218, so that the male clamping ring 22 and the female clamping ring 21 are tightly connected, making the entire sealing structure 2 form a more stable whole, which can better resist the vibration and impact generated during the operation of the induced draft fan and reduce the relative displacement between the components.

[0047] In another embodiment, each of the first sub-half-ring 211 and the second sub-half-ring 212 is provided with a third fastening lug. The third sub-half-ring 221 is provided with a third locking block corresponding to the third fastening lug of the first sub-half-ring 211, and the fourth sub-half-ring 222 is provided with a third locking block corresponding to the third fastening lug of the second sub-half-ring 212. Each third locking block engages with its corresponding third fastening lug. This engaging structure of the third locking block and the third fastening lug allows for the connection and fixation of the male clamping ring 22 and the female clamping ring 21 without the need for tools. The installation process is more convenient and faster, providing a stable locking force that ensures a tight fit between the male clamping ring 22 and the female clamping ring 21.

[0048] Preferably, the female clamping ring 21 is fixed to the outer wall of the housing 11 by spot welding. Fixing the female clamping ring 21 to the outer wall of the housing 11 by spot welding forms a strong, rigid connection, preventing displacement or shaking of the female clamping ring 21 due to vibration, airflow impact, or other factors during the operation of the induced draft fan. This stable fixing provides a solid foundation for the female clamping ring 21 and male clamping ring 22 to properly clamp the packing 23, ensuring that the packing 23 always maintains a stable pressure against the rotating shaft 13, thus reducing the risk of seal failure due to displacement of the female clamping ring 21.

[0049] Of course, in addition to spot welding, the end face of the female clamping ring 21 connected to the outer wall of the chassis 11 is provided with multiple strong magnets 27. The strong magnets 27 are used to attract the female clamping ring 21 to the outer wall of the chassis 11. Figure 3 As shown. Multiple strong magnets 27 on the end face of the female clamping ring 21 can quickly and firmly engage with the outer wall of the chassis 11 without the need for complex tools or welding operations. The installation process is simple and efficient. If a deviation in the position of the female clamping ring 21 is found, its position can be easily adjusted by external force until the optimal docking state is achieved. When maintenance of the sealing structure 2 or replacement of the packing 23 is required, only a certain amount of external force is needed to separate the female clamping ring 21 from the chassis 11, avoiding the irreversibility of spot welding fixation and greatly improving the flexibility of installation and maintenance, especially suitable for scenarios requiring frequent maintenance.

[0050] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims of this utility model.

Claims

1. A rotating shaft sealing structure for an induced draft fan, comprising a fan housing, a side plate disposed on an outer side of the housing, a rotating shaft transversely penetrating the housing and the side plate, and a sealing structure, wherein the side plate forms a gap with the outer wall of the housing, and the rotating shaft is rotatably connected to the side plate via a bearing, characterized in that, The sealing structure includes a female clamping ring fitted on the rotating shaft and close to the outer wall of the chassis, a male clamping ring fitted on the rotating shaft and mating with the female clamping ring, and packing material sandwiched between the male and female clamping rings and surrounding the rotating shaft. The female clamping ring includes a first and a second sub-half ring that can be spliced ​​or separated, and the male clamping ring includes a third and a fourth sub-half ring that can be spliced ​​or separated. The male and female clamping rings are detachably connected.

2. The rotary shaft sealing structure of the induced draft fan according to claim 1, characterized in that, The inner rings of the first and second sub-half-rings are each provided with a semi-circular positioning groove, and the two semi-circular positioning grooves form a positioning groove for the packing to be embedded; the inner rings of the third and fourth sub-half-rings are each provided with a semi-circular pressure ring, and the two semi-circular pressure rings form a pressure ring that cooperates with the positioning groove and presses the packing.

3. The rotary shaft sealing structure of the induced draft fan according to claim 2, characterized in that, The first sub-half-ring has a first slot on each of its two ends, and the second sub-half-ring has a first protrusion on each of its two ends that engages with the first slot; the third sub-half-ring has a second slot on each of its two ends, and the fourth sub-half-ring has a second protrusion on each of its two ends that engages with the second slot.

4. The rotary shaft sealing structure of the induced draft fan according to claim 3, characterized in that, The splicing position of the male clamping ring is circumferentially misaligned with the splicing position of the female clamping ring. The outer peripheral wall of the third sub-ring has two first through-hole lugs. The first and second sub-rings each have a first threaded lug corresponding to one of the first through-hole lugs. A first bolt is inserted into each first through-hole lug and connected to the corresponding first threaded lug. The outer peripheral wall of the fourth sub-ring has two second through-hole lugs. The first and second sub-rings each have a second threaded lug corresponding to one of the second through-hole lugs. A second bolt is inserted into each second through-hole lug and connected to the corresponding second threaded lug.

5. The rotary shaft sealing structure of the induced draft fan according to claim 3, characterized in that, The splicing position of the male clamping ring is circumferentially misaligned with the splicing position of the female clamping ring. The outer peripheral wall of the third sub-half-ring is provided with two first locking blocks. The first and second sub-half-rings are respectively provided with a first fastening ear corresponding to one of the first locking blocks, and each first locking block is engaged with the corresponding first fastening ear. The outer peripheral wall of the fourth sub-half-ring is provided with two second locking blocks. The first and second sub-half-rings are respectively provided with a second fastening ear corresponding to one of the second locking blocks, and each second locking block is engaged with the corresponding second fastening ear.

6. The rotary shaft sealing structure of the induced draft fan according to claim 3, characterized in that, The first protrusion is in the shape of an isosceles trapezoid, and the plane containing the short side of the isosceles trapezoid is fixedly connected to the end face of the second sub-half-ring. The shape of the first slot is adapted to the shape of the first protrusion. The second protrusion is in the shape of an isosceles trapezoid, and the plane containing the short side of the isosceles trapezoid is fixedly connected to the end face of the fourth sub-half-ring. The shape of the second slot is adapted to the shape of the second protrusion.

7. The rotary shaft sealing structure of the induced draft fan according to claim 6, characterized in that, The first and second sub-half rings are each provided with a third threaded lug. The third sub-half ring is provided with a third through-hole lug corresponding to the third threaded lug of the first sub-half ring. The fourth sub-half ring is provided with a third through-hole lug corresponding to the third threaded lug of the second sub-half ring. A third bolt is inserted into each third through-hole lug and connected to the corresponding third threaded lug.

8. The rotary shaft sealing structure of the induced draft fan according to claim 6, characterized in that, The first and second sub-half rings are each provided with a third fastening lug. The third sub-half ring is provided with a third locking block corresponding to the third fastening lug of the first sub-half ring. The fourth sub-half ring is provided with a third locking block corresponding to the third fastening lug of the second sub-half ring. Each third locking block is engaged with the corresponding third fastening lug.

9. The rotary shaft sealing structure of the induced draft fan according to any one of claims 1-8, characterized in that, The female clamping ring is fixed to the outer wall of the chassis by spot welding.

10. The rotary shaft sealing structure of the induced draft fan according to any one of claims 1-8, characterized in that, The end face of the female clamping ring connected to the outer wall of the chassis is provided with multiple strong magnets, which are used to attract the female clamping ring to the outer wall of the chassis.

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